ANALYSIS OF PROCESS OF THE MOLD CAVITY FILLING OF THE LIGHTWEIGHT PROFILE FROM MATERIAL PE TIPPELIN 7100S BY THE TECHNOLOGY OF PLASTIC EXTRUSION

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_201626
JAN PASKO, STEFAN GASPAR
Technical University of Kosice, Faculty of Manufacturing Technologies, Department of Design
Technical Systems
Presov, Slovak Republic

e-mail: stefan.gaspar@tuke.sk
Abstract
The presented paper deals with the examination of the mold cavity filling process for the production of lightweight plastic profiles from material PE TIPELIN 7100S applying the technology of extrusion into the mold. The principle of the extrusion technology and the carrying out of the experiments are determined in the introductory parts. The following parts focus on the analysis and evaluation of the mold cavity filling process for the production of lightweight profiles from from material PE TIPELIN 7100S with orientation on the influence of the mold temperature on the mold cavity filling time and status.
Keywords: extrusion, filling process, mold temperature, filling time
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APPLICATION OF NUMERICAL SIMULATIONS ON X10CRWMOVNB9-2 STEEL MULTILAYER WELDING

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_201628
JAROMIR MORAVEC1, TOMASZ KIK2, IVA NOVAKOVA1
1Technical University of Liberec, Liberec, Czech Republic
2Silesian University of Technology, Welding Department, Gliwice, Poland

e-mail: jaromir.moravec@tul.cz
Abstract
Creep-resistant martensitic steel X10CrWMoVNb9-2 (P92) is suitable for high-temperature application used in the ultra-supercritical (USC) power plants at temperatures within the limits from 600 to 620°C and pressures about 26 MPa. It is steel alloyed with vanadium and with controlled content of boron and nitrogen. The aim of this paper is to describe how can be optimized welding processes by means of the numerical simulations mainly with respect to the structural changes and hardness in the HAZ. On the real multilayer weld will be described how to arrange whole experiment in order to obtain not only relevant input data but also verification data. Additional aim of this paper is to propose mathematical description of the computational model that is usable for simulation computations of welding and heat treatment of real structure components.
Keywords: numerical simulation, X10CrWMoVNb9-2 steel, welding, SYSWELD, hardness prediction
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ASSESSING THE INFLUENCE OF TECHNOLOGICAL PARAMETERS ON THE SURFACE QUALITY OF STEEL MS1 AFTER WEDM

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_201629
LUBOSLAV STRAKA, SLAVOMIRA HASOVA
Technical University of Kosice, Faculty of Manufacturing Technologies, Department of Manufacturing Processes Operation
Presov, Slovak Republic

e-mail: slavomira.hasova@tuke.sk
Abstract
The paper deals with the assessment of significance impact of selected technological parameters in Wire Electrical Discharge Machining on final quality of machined surface in terms of surface roughness. For determining the significance of impact of the individual technological parameters was used the statistical method Design of Experiments which is conventionally used for mathematical modelling the impact of selected technological parameters on quality indicators of machined surface previously untested experimental samples. The aim of the paper was, based on experimentally-made samples of alloyed steel MaragingSteel MS1 by WEDM technology, to select the technological parameters which significantly affect machined surface quality in terms of surface roughness parameter Rz.Here you should describe the paper idea in short.
Keywords: Design of Experiments (DoE), Wire Electrical Discharge Machining (WEDM), technological parameters, surface roughness, product quality
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DEPENDENCE OF HARDNESS OF CONTINUES DIE-CASTING PRODUCTS ON FE CONTENT

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_201634
MIROSLAV RIMAR, MARCEL FEDAK, ANDRII KULIKOV, PETER SMERINGAI
Technical University of Kosice, Faculty of Manufacturing Technologies with a seat in Presov, Department of Process Technique
Presov, Slovak Republic

e-mail: miroslav.rimar@tuke.sk
Abstract
Nowadays die-casting is one of the best of metal casting system. Die-casting comparing with the other casting methods is cost preferably, the savings may be 20% of the metal needed for the casting and cost savings of foundry production can be around 30%. In this work we have measure hardness of Al-Si alloy respect to its Fe content. In our experiments we have used digital microhardness tester CV - 400D respect to the Vickers hardness test. Samples were processed in dentacryl. We have made a conclusion that content of the Fe in the alloy have some influence on the product’s hardness. Even insignificant difference in chemical composition of the casting products will lead to different hardness characteristics of the products.
Keywords: die-casting, Al-Si alloys, hardness, chemical composition, horizontal die-casting machine
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DETERMINATION OF THE RELIABILITY MODEL OF COOLING UNIT OF ELECTRO-EROSION MACHINE

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_201636
LUBOSLAV STRAKA
Technical University of Kosice with a seat in Presov, Faculty of Manufacturing Technologies, Department of Manufacturing Processes Operation
Presov, Slovak Republic

e-mail : luboslav.straka@tuke.sk
Abstract
Reliability and safety of technical equipment has an important role in engineering practice. Determining of reliability of complicated technical equipment requires complex analysis and thorough preparation of inputs which means processing of great volume of information. On the basis of available information about operation and records about character of failures of observed equipment, it is possible by applying proper reliability model, to describe mathematical functions of particular reliability indicators in dependence on their operation time. The aim of the paper is to determine empirical reliability model of cooling unit of electro-erosion machine AgieCut 270HSS on analysis of its failures which are registered in the equipment database.
Keywords: reliability model, technical equipment, operation probability, failure element, Weibull distribution
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IMPACT OF CONSTRUCTIONAL MODIFICATION OF THE PRESSURE DIE CASTING MOLD INLET SYSTEM ON THE INTERNAL SOUNDNESS OF THE SILUMIN CASTING

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_201643
JAN MAJERNIK, JAN PASKO, STEFAN GASPAR
Technical Universtity of Kosice, Faculty of Manufacturing Technologies with a seat in Presov, Department of Design Technical Systems
Presov, Slovak Republic

e-mail: stefan.gaspar@tuke.sk
Abstract
The design of the inlet system has been regarded as a major factor in the internal homogeneity of the casting. Being designed correctly, the system should ensure the proper and continuous filling of the mold cavity. Continuous filling of the cavity gives the initial prerequisite for internal soundness and homogeneity of the casting reflected in its quality and mechanical properties. The paper deals with the design of the inlet system for a particular type of the casting, its optimization using computer simulation as well as evaluation of the real results measured on the casting physical models.
Keywords: pressure die casting, mold, inlet system, casting quality
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LUBRICITY OF THERMO-OXIDIZED ENGINE OILS

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_201647
JOSEF POSTA, BOHUSLAV PETERKA, ZDENEK ALES, MARTIN PEXA, JINDRICH PAVLU, HIEN VUTAN
Czech University of Life Sciences Prague, Faculty of Engineering, Department for Quality and Dependability of Machines
Prague, Czech Republic

e-mail: zdenek.ales@gmail.com
Abstract
Severe temperature load of engine oils effects their relatively rapid thermo-oxidation. Some types of combustion engines cause, a particularly high permanent temperature load of engine oil. Gas combustion engines of cogeneration units of biogas plants are also operated in a similar way. These combustion engines operate for long periods at full load and constant speed. Biogas produced by fermentation of waste organic materials is used as a fuel. Intensity of degradation of engine oil is caused most often by high and long-term temperature load, total number of wear particles and contamination of combustion products. Content of combustion products depend on the individual content of crude biogas.
The aim of the paper is to examine partial effect of long-term temperature load and thermo-oxidative stability of selected types of engine oils for gas engines used in cogeneration units. Mineral oil, hydrocracked oil and full synthetic oil was tested. All of selected oils are recommended for use in gas engines. Oil lubricity was tested on Reichert tester device during standard conditions. As results show, for some types of engine oil a long-term temperature load had positive effect and for some types of engine oil a long-term temperature load had adverse effect on lubricity.
Keywords: engine oil, thermo-oxidation, lubricity, Reichert test, oil degradation
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MANUFACTURING TECHNOLOGIES IN AUTOMOTIVE PRODUCTION AND WASTE WATER CLEANING ON ZEOLITE IN VIEW OF COPPER

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_201648
IVETA PANDOVA
Technical University of Kosice, Faculty of manufacturing technologies with a seat in Presov
Presov, Slovak Republi
c

e-mail: iveta.pandova@tuke.sk
Abstract
Industrial development in the 20th century brought environmental pollution, which includes also the water. Industrial activity, especially metallurgical and engineering industry brings pollution by heavy metals. These substances act on living organisms toxic, therefore the individual components of the environment are strictly monitored. Current research of heavy metals removal is intended for the use of low-cost methods such as the sorption on natural materials, as zeolites, and also their use as ion-exchangers. The paper presents research results of sorption properties of natural zeolite - clinoptilolite considering sorption of copper cations.
Keywords: waste water, toxical metals, sorbents, zeolite, clinoptilolite
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MEASUREMENT WEAR OF DRILL IN THE MANUFACTURING PROCESS AND ITS SIMULATION IN VIRTUAL REALITY

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_201649
RADOSLAV KREHEL, MAREK KOCISKO, TOMAS VYSOCKY, ANDREA CIZIKOVA, PATRIK SZENTIVANYI
Technical University of Kosice, Faculty of Manufacturing Technologies , Department of Computer Aided Manufacturing Technologies
Presov, Slovak Republic

e-mail : radoslav.krehel@tuke.sk
Abstract
Using virtual reality nowadays not only includes applications in the entertainment industry as well as use in areas in which have not yet penetrated. Such area is the manufacturing process. Due to hardware that has been designed a priority for entertainment purposes can be realized serious simulation. Measurement of various parameters during the manufacturing process and after, helped by the creation of new working tools and also for their innovation. All values that are studied differ in based on the type of wear and also the basis for the selected device that examines wear it. Progress in terms of materials and production possibilities with new trends as in the measurement, as well as in examining and subsequent production of new tools
Keywords: virtual reality, simulation of manufacturing process, measurement of drill abrasion, tool, the wear
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MONITORING THE CONDITION OF THE SPINDLE OF THE MILLING MACHINE USING VIBRATION

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_201653
STEFANIA OLEJAROVA, TIBOR KRENICKY
Technical University of Kosice, Faculty of Manufacturing Technologies
Presov, Slovak Republic

e-mail : stefania.olejarova@tuke.sk
Abstract
The goal of this paper is to point out the possibility of occurrence of vibration during milling due to changing depth of removed layer of the material. Growth of values of mechanical vibration in depending on the value of the nominal thickness of the splinter was monitored during changing technological parameters of the milling process due to rotation speed of the engine. The results of the experimental part are values of vibration acceleration amplitude measured by a piezoelectric sensor on the head of the milling machine. Two types of tools have been used for the measurements - a plate and a monolith milling machine and rotation speed and material removal have been changed on the selected device. Based on the analysis of created graphical dependencies a set of new knowledge, conclusions and recommendations is formulated.
Keywords: milling, material processing, mechanical vibration, frequency, frequency spectrum
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NUMERICAL AND EXPERIMENTAL MODAL ANALYSIS OF GEAR WHEEL

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_201654
ANDREA CIZIKOVA1, KATARINA MONKOVA1, JAROMIR MARKOVIC2, JAKUB CIENCALA3
1Technical University of Kosice, Faculty of Manufacturing Technologies
Presov, Slovak Republic
2Slovak Metrological Society, Banska Bystrica, Slovakia
3Technical university of Ostrava, Faculty of Engineering, Ostrava, Czech Republic

e-mail: katarina.monkova@tuke.sk
Abstract
The paper deals with the theoretical and practical aspects that are necessary for identifying of modal parameters of the gear wheel as a component of the planetary gear mechanism, which are basic for the dynamic analysis. The paper presents thematically integrated part of the results of numerical and experimental modal analysis conducted on a particular gear wheel. The paper aimed to create experimental and computational model and subsequent verification of selected theories in defining the modal parameters, comparing results obtained numerical and experimental modal analysis and assessment of dynamic characteristics of the component with respect to its operating conditions. Numerical analysis was carried out in a computer CAD/CAM program PTC Creo, which works on the Finite Element Method. The results obtained by experimental modal analysis were evaluated by measuring system PULSE.Experimental measurements have shown that the values of natural frequencies along with the natural shapes are adequate and that no natural frequency is not the same or close to the gear frequency, so the component can be used in the real practice.
Keywords: modal analysis, vibrations, modal parameters, excitation, frequency response function
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OPTIONS SURFACE TREATMENT ALUMINUM STRUCTURAL COMPONENTS

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_201655
MIROSLAV GOMBAR1, JAN KMEC1, ALENA VAGASKA2, LYDIA SOBOTOVA3, MIROSLAV BADIDA3
1Institute of Technology and Business, Department of Mechanical Engineering
Ceske Budejovice, Czech Republic
2Technical University of Kosice, Faculty of Manufacturing Technologies, Department of Mathematics, Informatics and Cybernetics
Presov, Slovak Republic
3Technical University in Kosice, Faculty of Mechanical Engineering, Department of Process and Environmental Engineering
Kosice, Slovak Republic

e-mail : gombar@mail.vstecb.cz
Abstract
The contribution examines the effects of the electrolyte chemical composition on the resulting AAO layer thickness, which is one of the main indicators of corrosion protection of aluminium parts and which also favourably affects mechanical properties of component surfaces. For comparison purposes, there were selected the electrolytes comprising sulphuric acid and sulphuric acid with sodium chloride. Anodizing time for both samples was 210 minutes. The results obtained lead to the assumption that it is possible to replace conventional electrolytes by those that are more environmentally friendly, reduce the costs of their disposal and allow obtaining oxide layers of the same thickness. Detected difference of thickness of formed surface layers was moving in range 1-1,50•10-3 mm, with lowering the amount of used chemical substances and amount of used electrical energy on half of original amounts, at the same time. Here you should describe the paper idea in short.
Keywords: anodizing, surface treatment, thickness
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TECHNOLOGY OF GASEOUS FUEL COMBUSTION RESPECT TO NOX FORMATION

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_201665
MIROSLAV RIMAR, MARCEL FEDAK, ANDRII KULIKOV, PETER SMERINGAI
Technical University of Kosice, Faculty of Manufacturing Technologies, Department of Process Technique
Presov, Slovak Republic

e-mail: miroslav.rimar@tuke.sk
Abstract
NOx formation is one of the main ecological problems nowadays as nitrogen oxides is one of main reasons of acid rains. Nitrogen oxides (NOx) are formed as a result of oxidation of nitrogen which occurs in the air and in a fuel.The aim of this work is to research the formation of NOx in combustion of gaseous fuels. The ANSYS model was designed according to the calculation to provide full combustion and good mixing of the fuel and air. In this paper we research influence of combustion air composition by simulation combustion with the different N2/O2 air ratio on NOx formation.The theoretical and experiential knowledge allow understanding and predict the mechanisms of NOx formation.
Keywords: nitrogen oxides, combustion, ANSYS, N2/O2 air ratio
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THE CORRELATION OF PARAMETERS MEASURED ON ROTARY MACHINE AFTER REPARATION OF DISREPAIR STATE

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_201667
PETR BARON, JOZEF ZAJAC, MARTIN POLLAK
Technical University of Kosice, Faculty of Manufacturing Technologies
Presov, Slovak Republic

e-mail: petr.baron@tuke.sk
Abstract
The article describes the application of tools of technical diagnostics of bearings in device for the production of cellulose due to previous difficult disorder of device. Diagnostics of bearings is a very challenging area of operational diagnostics. Bearing damage may be caused by various factors such as the action of excessive forces, unsuitable lubricant, contamination of the lubricant, the lubricant oxidation, degradation of additives, etc. Such factors can significantly reduce the lifetime of technical device. The measurements and expertises that took place, as described in the article, were based on the requirement of operator's technical equipment to assess the trend of selected dynamic parameters, i.e. prediction of possibilities of risk of damage to the technical system in a short time. The measurement and subsequent identification of the real state of technical device has been performed in accordance with the recommendations of standard ISO 10816-3.
Keywords: vibrodiagnostics, dynamic signal analysis, dynamic parameters, bearing, time record
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THE EFFECT OF FACTORS ON THE OCCURRENCE OF VIBRATION UNDER OPERATIONAL CONDITIONS

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_201669
STEFANIA OLEJAROVA
Technical University of Kosice, Faculty of Manufacturing Technologies
Presov, Slovak Republic

e-mail : stefania.olejarova@tuke.sk
Abstract
When using the method of processing materials by a plasma beam it is necessary to know the specific requirements for quality and economy of cutting. Vibrations occur during this process, which can have a negative effect on lifespan of the machine. Therefore currently there is greater emphasis on exploring the effects causing these vibrations. The goal of this paper is to analyze and consider the effect of input technological factors on the occurrence and size of mechanical vibration under operational conditions. It analyzes the effect of change of the feed speed on the plasma machine under the use of four beams on the acceleration amplitude and vibration frequency. Graphic dependencies are created from measured values, which are used for comparison and evaluation of the technical condition of selected device.
Keywords: monitoring, processing, factor, mechanical vibration, frequency spectrum
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THE METHODS TO DETERMINE THE STRAIN RATE OF THE STEEL SHEETS USED IN THE PRODUCTION PROCESS

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_201670
ERIKA FECHOVA1, JOZEF KMEC2, ALENA VAGASKA1
1Technical University of Kosice, Faculty of Manufacturing Technologies with a seat in Presov, Presov, Slovak Republic
2University of Presov in Presov, Faculty of Humanities and Natural Sciences, Presov, Slovak Republic

e-mail: erika.fechova@tuke.sk
Abstract
The paper deals with observation and description of the influence of strain rate on true stress - true strain. It compares various material models that consist strain rate for deep-drawing sheets in order to work out the most accurate material models. The more accurate input to the simulation program, give the more exact output. These simulation programs introduce higher accuracy into development and production of the pressed material and reduce production costs. Computer simulation using the software programs (e.g. PAM-STAMP, ABAQUS – Explicit, DYNA 3D etc.) also presents replacement of financially expensive experiment, utilization of potential properties of materials and error detection in the production process.
Keywords: strain rate, material constants, steel sheets, Matlab, Curve Fitting Toolbox
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THE OPTIMAL PLAN OF PREVENTIVE MAINTENANCE OF THE ELECTROEROSION EQUIPMENT SODICK AQ15L

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_201671
LUBOSLAV STRAKA, SLAVOMIRA HASOVA
Technical University of Kosice, Faculty of Manufacturing Technologies, Department of Manufacturing Processes Operation
Presov, Slovak Republic

e-mail: luboslav.straka@tuke.sk
Abstract
The main aim of planning suitable maintenance interventions during operation of the technical equipment is to prevent a failure creation. Adequate maintenance of its individual elements can prevent the development of major failures, but also significantly increase the reliability and extend the service life. In general, the removal of a major failure of technical equipment is very much costly, but also time-consuming as carrying out the preventive maintenance at certain intervals. Therefore, these reasons compel us to deal with planned maintenance of technical equipment already in phase of design. However, the important question is determining an appropriate interval for preventive maintenance of the parts of technical equipment. The paper describes a procedure for optimal preventive maintenance for CNC electroerosion equipment Sodick AQ15L when considering Weibull distributions of random variables of failures.
Keywords: preventive maintenance, lifetime, equipment, optimalization, Weibull distribution
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THE RESEARCH OF THE FRACTURE PROCESS AND ANALYSIS OF THE FOUNDRY ERRORS OF DIE CASTINGS FROM HYPOEUTECTIC SILUMIN

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_201672
STEFAN GASPAR, JAN PASKO
Technical Universtity of Kosice, Faculty of Manufacturing Technologies with a seat in Presov, Department of Design Technical Systems
Presov, Slovak Republic

e-mail: stefan.gaspar@tuke.sk
Abstract
The research in the technology of production of die castings from hypoeutectic silumin which are nowadays deeply implemented in the rapidly developing automobile, shipping and airline industry aims to increase the manufacture and quality properties of the castings. A higher attention is paid to die castings inner quality which is characterized by a type and range of casting-related defects. In accordance with a specific character of this production technology, the major casting defects are cavities, Al2O3 particles and internal cold laps. The presenting contribution deals with the research of the fracture process and analysis of the foundry errors of die castings from hypoeutectic silumin.
Keywords: die castings, fracture process, foundry errors, quality of cast
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MACHINERY FOR FOREST CULTIVATION – INCREASE OF RESISTANCE TO ABRASIVE WEAR OF THE TOOL

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_201684
DANIELA KALINCOVA1, MIROSLAVA TAVODOVA1, MICHAELA HNILICOVA2, DARINA VEVERKOVA3
1Technical University in Zvolen, Faculty of Environmental and Manufacturing Technology, Department of Production Engineering and Quality Management, Slovak Republic
2Technical University in Zvolen, Faculty of Forestry, Department of Forest Harvesting, Logistics and Ameliorations, Slovak Republic
3Technical University in Zvolen, The Institute of Foreign Languages, Slovak Republic

e-mail: kalincova@tuzvo.sk
Abstract
The submitted paper deals with an analysis of machinery tools for forest cultivation and the way of wear of their functional parts. It analyses the state of tools of crusher of undesirable advance growth, which are exposed mainly to abrasive and fatigue wear in operation. On damaged tools – teeth, the effect of wear and mechanical and structural properties of teeth materials of different construction realisation were evaluated. Based on the material analysis results, the proposals for increase of resistance of the functional surfaces to abrasive wear in order to extend their lifespan are processed in the paper. Using visualization of the tool, the functional parts are determined, where hard layers should be applied to extend tool lifespan. At the end, the suggestions of experimental solution of the described problem are presented.
Keywords: tools of crushers, wear, microstructure of material, tool visualization, lifespan
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ANALYSIS OF THE SELECTED TECHNICAL PARAMETERS OF SKIDDERS

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_201686
JAN KOVAC, JOZEF KRILEK, MILAN STEFANEK, TOMAS KUVIK
Technical University in Zvolen, Faculty of Environmental and Manufacturing Technology, Department of environmental and forestry technology
Zvolen, Slovak Republic

e-mail: jan.kovac@tuzvo.sk
Abstract
Basic information on the extraction-production process, including felling, skidding, handling and transport of wood, which is fully mechanized and automated. The aim of the article is to highlight the technical equipment and new possibilities in timber skidding. It covers general information, technical and dimensional specifications of machinery for skidding with or without choker. The paper analyses the current state and overview of forest wheeled skidders on the Slovak and foreign markets. Most importantly, it contains tables and graphs comparing the weight and size parameters of various types. Based on the above selected technical parameters of skidders, a statistical analysis has been carried out using regression analysis that informs about the compactness of the machine, as well as the performance parameters of the selected machines.
Keywords: forestry machinery, wheeled skidders, timber skidding, technical parameters
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TRACER ROBOT WITH A PROPORTIONAL CONTROL

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_201690
ELENA PIVARCIOVA, TIBOR CSONGRADY
Technical University in Zvolen, Faculty of Environmental and Manufacturing Technology Department of Machinery Control and Automation
Zvolen, Slovak Republic

e-mail: pivarciova@tuzvo.sk
Abstract
The paper deals with the analysis of the proportional control of a discrete process in a transport robot model. The issue was addressed by determination of relationships between individual external and internal variables and parameters of the process.
The gained results provide abetter understanding of the relations which will lead to better results in bigger and more complex processes. Such results can be used in above mentioned algorithms programming for the automatic guided vehicles (AGV) used for logistic purposes and for manipulating with specific materials.
Keywords: tracer robot, proportional control, PID, algorithm
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ANALYSIS OF THE WEAR OF SAW BLADE TEETH AND THE PROPOSAL OF METHODS OF INCREASING THEIR WEAR RESISTANCE

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_201694
MIROSLAVA TAVODOVA1, JOZEF KRILEK2, ANDRZEJ PEREC3, DANIELA KALINCOVA1, JAN KOVAC2
1Technical University in Zvolen, Faculty of Environmental and Manufacturing Technology, Department of Manufacturing Technology and Quality Management
Zvolen, Slovak Republic
2Technical University in Zvolen, Faculty of Environmental and Manufacturing Technology, Department of Environmental and Forestry Machinery
Zvolen, Slovak Republic
3Jakob of Paradyz University of Applied Sciences
Gorzow Wielopolski, Poland

e-mail: tavodova@tuzvo.sk
Abstract
The article focuses on the methods for evaluating wear of two types of saw blades. One type does not have sintered carbide plates and another are the plates soldered on. The article also addresses application of various methods with respect to increase the life of saw-blade teeth. Gradual wear of saw blade cutting knives gives rise to certain phenomena, which have impact on the whole process of cutting. The wear of cutting wedges of a saw blade considerably influences the entire system - the machine - tool - work piece, and thus it is crucial to correctly assess the wear of cutting wedges. Several methods were chosen and applied in order to ensure correctness of such an assessment and the results were compared. Subsequently, the materials commonly used for production of tools were evaluated with respect to their microstructure, suitability of the methods to increase their wear resistance and so increase their useful life. The analysis of the factors which need to be considered, will allow us to draw conclusions significant for further experiments.
Keywords: saw blade, cutting edge, wear, tool steel, coating
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TEST BENCH FOR TESTING OF THE TRACTION DRIVE OF RAILWAY VEHICLES


MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_201697
PETR HELLER, BOHUMIL CEJKA, LUKAS TRPAK
University of West Bohemia in Pilsen, Czech Republic
e-mail: bcejka@rti.zcu.cz
Abstract
This article gives an outline of the progress of work on the Study of UWB (University of West Bohemia) test bench for partly-suspended and fullysuspended variants of individual wheelset traction drives. First, a survey of existing designs of roller test benches was conducted. Its outcomes supported the idea of designing a completely new device. The main part of the article is devoted to the design of the test bench. Furthermore, the article briefly summarizes the progress and especially the partial results of the work on the task Computer simulation for optimization of the structural arrangement of the traction drive, which focuses on the development of a mathematical model of the aforementioned test bench.
Keywords: test bench, traction drive, torque transmission, suspension, gearbox oil leakage, fully-suspended drive, computer simulation, optimization
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DESIGN OF PRODUCT SEGMENTATION IN ASSEMBLYLINE

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016102
BRANISLAV MICIETA1, RADOVAN LIESKOVSKY2, VLADIMIRA BINASOVA1
1University of Zilina, Faculty of Mechanical Engineering, Department of Industrial Engineering, Zilina, Slovak Republic
2Emerson Network Power, Nove Mesto nad Vahom, Slovak Republic

e-mail:vladimira.binasova@fstroj.uniza.sk
Abstract
The paper deals with the products segmentation that is a flexible way of grouping products and simplifies both campaign planning as well as the creation of condition records in trade promotion management.Capacity channels, which are created by segmentation, increases seriality of assembly processes in customised production (Make to Order/Engineer to Order -MTO/ETO). These advantages enhance the competitiveness of the company in terms of cost reduction, acceleration and improvement with product quality increasing.In addition, the paper discusses the procedure how to segment products according of operational time.
Keywords: adaptive assembly processes, segmentation of products,development trends, advanced industrial engineering, production strategy
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MICROSTRUCTURE OF FIBRE LASER WELDED BUTT JOINTS

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016109
PAVOL SVEC, ALEXANDER SCHREK
Slovak University of Technology in Bratislava, Institute of Technologies and Materials,
Bratislava, Slovak Republic

e-mail: pavol.svec@stuba.sk
Abstract
Microstructures and microhardness profiles of butt joints welded by fibre laser were evaluated. Dual phase steel HCT980X and bake hardening steel HX220BD sheets with thickness of 1.2 mm were welded at five different welding parameters. The joints showed microstructural changes from ferrite and martensite in dual phase steels or ferrite in bake hardening steels to acicular ferrite, bainite and martensite in the fusion zones and heat affected zones. The welding resulted in a significant microhardness increases in the fusion zones and even more in the heat affected zones near dual phase stell HCT980X. The microstructures observed in particular weld zones corresponded well with microhardness profiles measured across the joints.
Keywords: dual phase steel, bake hardening steel, fibre laser welding, microstructure, microhardness
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WELD MOVEMENT IN DEEP DRAWING OF TAILOR-WELDED BLANKS

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016110
ALEXANDER SCHREK , PAVOL SVEC, VERONIKA GAJDOSOVA
Slovak University of Technology, Faculty of Mechanical Engineering, Department of Technologies and Materials,
Bratislava, Slovak Republic

e-mail: alexander.schrek@stuba.sk
Abstract
When applying tailor-welded blanks (TWB) composed of parts with different properties for deep drawing and other forming processes, problems with non-uniform material flow occur. Welding of various parts of TWB into usable units, their different stress-strain properties, respectively different thicknesses influence their formability and the weld movement. This results in inaccuracy of the drawn parts [Mainders 2000, Fracz 2013].
Various tool designs for deep drawing, stretching or bending process can influence the material flow and avoid errors on the drawn parts. One of the solutions is to use a blankholder able to adapt to different properties of the blank and enabling the non-uniform distribution of the blankholder pressure around the perimeter of the drawing edge [Evin 2012, Bílik 2010, Slota 2014].
Described drawing experiments were conducted on rectangular-shaped part drawn from TWB, which was manufactured from steel TRIP 780 with a thickness of 1 and 1.2 mm. The experiments were focused on comparison of the behaviour of different weld orientation at approximately uniform and controlled uneven distribution of the blankholder pressure on the elastic blankholder of the laboratory tool. The experimental results were compared with the simulation of the drawing process in a finite element simulation software DYNAFORM using explicit method.
Experiments confirmed that minimisation of the weld movement, more uniform material flow in the die and better dimensional precision of the drawn part during TWB drawing process can be achieved by optimised uneven distribution of the blankholder pressure whilst ensuring uniform lubrication.
Keywords: deep drawing, tailor-welded blank, weld movement, blankholder pressure
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ANALYSIS OF MATERIAL FOR FORMING DRILLS

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016111
MILAN DVORAK, KAREL OSICKA, MILAN KALIVODA
University of Technology in Brno, Faculty of Mechanical Engineering, Institute of Manufacturing Technology,
Brno, Czech Republic

e-mail: dvorak.m@fme.vutbr.cz
Abstract
Tool material HSS is used for drills forming. The supplied material has enclosed from two separate batches the same certificate from the manufacturer. The material is in the standard CSN 419830. From one batch can be produced drills from the second cannot be produced. The article discusses the detailed analysis of the material. The differences are shown that are not listed in the attestation. Tests were performed for the customer available. Tests are not time consuming. Customer engaged in mass production usually does not have the possibility to detect differences. The customer usually does not have the necessary equipment. Made and recommended tests are based on metallographic knowledge, including hardness measurements, qualitative and quantitative chemical analysis. Data have graphical output. Elements are compared from the viewpoint of influence on hot formability. According to these collected data, the customer can assume the subsequent success of the production process.
Keywords: HSS steel, forming drill, hardness test, carbide, chemical analysis
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LASER WELDING IMPACT ON DEFORMATION PROPERTIES OF STEELS WHEN USED FOR CAR-BODY PARTS

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016112
EMIL EVIN1, MIROSLAV TOMAS2
1Technical University of Kosice, Faculty of Mechanical Engineering, Department of Automotive Production,
2Department of Computer Support of Technology,
Kosice, Slovak Republic

e-mail: emil.evin@tuke.sk
Abstract
The energy absorption at crash, usually described by stiffness and crashworthiness, is the key request for the car-body components, considering the material they were made from. The modified 3-point bending test with fixed ends has been developed in our department to assess materials for the car-body parts. The force and punch path are measured and used to calculate stiffness and crashworthiness. Experiments were performed on high strength low alloyed steel H220PD, dual phase steel DP 600 and austenitic stainless steels AISI 304 for base material and specimens welded by solid state fiber laser YLS-5000. Based on the experiments and analysis, the austenitic stainless steel is better to use for car body components of frontal deformation zones. Otherwise, the passenger’s compartment is better protected by applying dual phase steel for car body parts when side impact occurs.
Keywords: car-body, stiffness, crashworthiness, 3-point bending test, laser welding
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HAND BENDER FOR GUTTERS HOOKS

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016113
TOMAS FRANEK, JAN HLAVAC
University of West Bohemia, Faculty of Mechanical Engineering, Department of Machine Design
Pilsen, Czech Republic

e-mail: jhlavac@kks.zcu.cz
Abstract
This paper represents results of student project. The main goal of this work was to redesign and construct hand controlled machine to bend gutter hooks. Hand bender for gutters hooks is used by plumbers’ shops. Redesign of the hand bender is processed with several improvements. The whole process of construction is described in this work. From the introduction to the bending technology, choosing the most optimal construction variant of the other mentioned benders, to final dimensioning and FEA strength analysis. The base load is deduced from forming technology theory. FEA is used to evaluate results of prior dimensioning and to evaluate proper design.
Keywords: steel bending, forming machine, design, strength analysis, FEA
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COMPARISON OF IMPLICIT AND EXPLICIT ALGORITHMS OF FINITE ELEMENT METHOD FOR THE NUMERICAL SIMULATION OF HYDROFORMING PROCESS

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016114
JAN RIHACEK1, LIBOR MRNA2
1Brno University of Technology, Faculty of Mechanical Engineering, Institute of Manufacturing Technology, Department of Metal Forming,
Brno, Czech Republic
2Institute of Scientific Instruments of the Czech Academy of Sciences, Brno, Czech Republic

e-mail: rihacek.j@fme.vutbr.cz
Abstract
This paper deals with numerical simulation possibilities of a hydroforming technology in production of a flow solar absorber with structured surface in asingle technological operation.An austenitic stainless steel X5CrNi18-10 is used as a material for the production of the flow solar absorber. In the theoretical chapters, a comparison between static implicit and dynamic explicit algorithms of finite element method (FEM) is performed. Experimental part of the paper includes creation of geometrical, material and computational models for the explicit and the implicit solution in software ANSYS Workbench Static Structural and ANSYS LS-DYNA. Finally, due to evaluation of the experiment and FEM results, the comparison between the implicit and the explicit theoretical solution of a formed part thickness is performed.
Keywords: solar absorber, hydroforming, austenitic steel, ANSYS Workbench, LS-DYNA, numeric simulation
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DETERMINATION OF DEFORMATION RESISTANCE IN TUBE FLARING PROCESS

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016115
EVA PETERKOVA, RADKO SAMEK
Brno University of Technology, Faculty of Mechanical Engineering
Brno, Czech Republic

e-mail: peterkova@fme.vutbr.cz
Abstract
The determination of the forming force required for manufacturing of the specified component is very important in practice. It is necessary to know value of the deformation resistance of the forming process for its theoretical finding. This paper presents a methodology for calculating of the total deformation resistance and subsequently of the forming force by using the theoretical equations. The method of the tube flaring was chosen for the research. The experiments were done on the testing tube samples from material 1.4301. These experiments were performed for comparing of the theoretical and real values of the forming force. The calculated values of forces differ slightly from those obtained experimentally. This difference lies in the use of the simplified input conditions and computational analysis such as material model obtained from tensile test of tubes, the chosen coefficient of friction and the simplified approach to calculation of the bending stress used in the theory of deep drawing.
Keywords: tube flaring test, deformation resistance, forming force, analytical model
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PROPOSAL OF THE FLEXIBLE TOOL FOR THE PRODUCTION OF AEROSPACE PARTS

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016116
KAMIL PODANY, ZDENEK LIDMILA, JAN RIHACEK
Brno Univesity of Technology, Faculty of Mechanical Engineering, Institute of Manufacturing Technology
Brno, Czech Republic

e.mail: podany@fme.vutbr.cz
Abstract
The paper is focused on the design of a container tool for forming of sheet metal parts used in the aerospace industry, which is based on a flexible medium. The tool is intended for hydraulic press CBJ 500-6 and it is multi-purpose for a wide range of materials, shapes and sizes. A combination of polyurethane plates Fibroflex and two rubber plates are used as an elastic medium. A punch is made of plywood of 28 mmthick with negative shape of a part. For elimination of a springbackduring a bending operation,relieving of bending surfaces is performed. The designed tool and its dimensions are verified by using FEM analysis and subsequently also by practical experiment, i.e. verification and debugging functionality for a standard product of aluminium alloy 6061.T6.
Keywords: forming, sheet metal, flexible tool, elastomer, aerospace parts, numerical simulation, aluminium alloy
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VERIFICATION OF MEASUREMENT OF DYNAMIC LOADING DURING THE TAYLOR ANVIL TEST

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016117
MIROSLAV SLAIS1, MILAN FOREJT2, IVO DOHNAL3
1Brno University of Technology, Faculty of Mechanical Engineering, Institute of Manufacturing Technology, Department of Metal Forming and Plastics,
Brno, Czech Republic
2Brno University of Technology, Faculty of Mechanical Engineering, Institute of Manufacturing Technology, Department of Metal Forming and Plastics,
Brno, Czech Republic
3Bosch, Jihlava, Czech Republic

e-mail: miroslav.slais@gmail.com
Abstract
The Taylor Anvil test is used to estimate dynamic behaviour of materials in an interval of strain rates of 102 to 104 s-1.
The specimen is deformed due to impact on a rigid target instrumented with detectors. This measuring set provides an advantage in finding the forming force, which acted during the deformation. A Charpy hammer of nominal energy of 50J was used for the verification of dynamic loading induced by impact of a specimen. This measuring set is placed in the Laboratory of high strain rates at FME Brno, Institute of Manufacturing Technology, Department of Metal Forming and Plastics. The experiment arrangement allows comparing the results obtained independents by strain gauges and piezoelectric sensors.
Keywords: high strain rates, Charpy hammer, Taylor anvil test, strain gauges, dynamic loading
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INFLUENCE OF CROSSHEAD GUIDE TO OFF-CENTRE LOAD OF FORGING HYDRAULIC PRESS

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016118
VACLAV KUBEC, MILAN CECHURA
University of West Bohemia in Pilsen, Faculty of Mechanical Engineering, Pilsen, Czech Republic

e-mail: vkubec@kks.zcu.cz
Abstract
Off-centre loads acting on hydraulic forging presses have a major impact on their engineering properties. If the tilting moments resulting from such loads are absorbed using an appropriate and effective design, the deformation of the press frame and pressures in crosshead guides can be minimized.
The present paper compares values obtained from several variants of virtual models of an open-die forging hydraulic press under off-centre load. The objective was to evaluate the effect of the design solution of crosshead guides on the behaviour of the frame.
Keywords: forging press, hydraulic press, accuracy, guides, crosshead, virtual models
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COMPARISON OF TECHNICAL PARAMETERS OF FORGING ROLLS AND CROSS WEDGE ROLLING

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016119
MARTIN ZAHALKA, MILAN CECHURA
University of West Bohemia, Faculty of Mechanical Engineering, Regional Technological Institute
Pilsen, Czech Republic

e-mail: martinza@rti.zcu.cz
Abstract
It is necessary to improve parameters of forging lines, because it leads to higher productivity and minimization of costs during production process.
This paper deals with parameters of modern preforming processes such as forging rolls and cross wedge rolling. These parameters are compared with respect to maximal forces, moments and total energy consumption necessary for production of identical part.
Keywords: forging rolls, cross wedge rolling, preforming, DEFORM, FEM simulation
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INFLUENCE OF HYDRAULIC PRESS COLUMNS CONNECTION ON DYNAMIC PROPERTIES

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016120
KAREL RAZ, MILAN CECHURA
University of West Bohemia, Faculty of Mechanical Engineering, Regional Technological Institute
Pilsen, Czech Republic

e-mail: kraz@rti.zcu.cz
Abstract
This paper deals with possibilities of hydraulic press design optimization. Dynamical loading is deeply discussed here. Technological operation called high speed forging is often used on this kind of machines. This technology leads to vibrations of whole hydraulic press. It must be ensured, that the lowest natural frequency of the whole press is higher comparing with frequency of forging. In research was performed finite element analysis, which showed influence of design modifications.
Keywords: hydraulic press, forging, modal analysis, columns, frequency, finite element method
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DESIGN OF MECHANICAL FORGING PRESS WITH MAXIMAL FORCE IN SIDE CAVITY

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016121
ZDENEK CHVAL, MILAN CECHURA
University of West Bohemia, Faculty of Mechanical Engineering, Regional Technological Institute
Pilsen, Czech Republic

e-mail: zdchval@rti.zcu.cz
Abstract
This paper deals with design of crankshaft forging press for multi-cavity forging with maximal forging force in on of side cavities. As a tool was used optimization of structure, structural FEM analysis and geometrical modification of frame. Results are in more uniform stress distribution in whole structure of forging press. This design leads to optimized production and improved quality of final products. Forging press with this modification has higher durability and it has competitive advantage.
Keywords: forming machine, mechanical forging press, structural FEM analysis, frame
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INCREASING THE PRODUCTIVITY OF FORGING PRESS BY REDESIGNING OF A DRIVE

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016122
MIROSLAV BELE, JAN HLAVAC, JIRI STANEK
Regional Technological Institute, Faculty of Mechanical Engineering, University of West Bohemia
Pilsen, Czech Republic

e-mail: bele@rti.zcu.cz
Abstract
Productivity of automated forging equipment can be improved by increasing the speed of the handling operations. It is necessary to increase the speed of a forging press to increase the productivity of the whole forging equipment. This higher speed can be achieved by adjusting the drive as presented in this article. The typical drive of a forging press consists of an electric motor, gears, energy accumulator (flywheel), clutch and a brake. For each working stroke, the required energy must be available which is taken from the energy accumulator so that the rotation speed can be reached within the permissible speed drop. This article describes the working stroke of the press, including the changes in speed and accumulated energy. Modifications to the press drive involve changing the electric motor and gear modification (belt drive and gearing). The result may be, apart from increased productivity, also weight savings (in the flywheel and electric motor) and financial savings (electric motor).
Keywords: energy consumption, forging press,design,electric drive,energy accumulation
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EVALUATION OF SURFACE QUALITY OF X210CR12 STEEL FOR FORMING TOOLS MACHINED BY WEDM

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016123
KATERINA MOURALOVA, RADIM ZAHRADNICEK, PAVEL HOUSKA
Brno University of Technology, Faculty of Mechanical Engineering
Brno, Czech Republic

e-mail: mouralova@fme.vutbr.cz
Abstract
The stressed parts of forming tools are usually made of tool alloy steel X210Cr12 with additional thermal treatment. When machining these parts, due to the high demands on shape and precision, wire electrical discharge machining (WEDM) is used, which a method is belonging to the group of non-convention machining technologies. WEDM uses physical principles to cut material, which enables for machining parts which were already thermally treated. The long-term trend of improving precision and quality of the machined surface leads to the necessity of its thorough studying. This study concerns itself with evaluating the morphology of the worked surface using electron microscopy (SEM) and chemical composition analysis (EDX). The focus was to evaluate the quantity of the adhered material from the brass wire electrode. Furthermore, surface and profile parameters of the machined surface were studied using Atomic force microscope (AFM). Samples for the experiment were made of X210Cr12 steel, which was treated with 4 different thermal treatments.
Keywords: WEDM, electrical discharge machining, steel X210Cr12, quality of surface, analysis of the chemical composition
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IMPROVEMENT OF MODEL OF ALUMINIUM ALLOYS BEHAVIOUR FOR APPLICATION IN NUMERICAL SIMULATIONS OF WELDING

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016124
MOJMIR VANEK1, JAROMIR MORAVEC2, JAN RIHACEK1
1Brno University of Technology, Faculty of Mechanical Engineering, Institute of Manufacturing Technology
Brno, Czech Republic
2Technical University of Liberec, Faculty of Mechanical Engineering, Department of Engineering Technology
Liberec, Czech Republic

e-mail : mojmir.vanek@vut.cz
Abstract
This article describes how to modify numerical solutions to enable more accurate prediction of the size of heat affected zones (HAZ) during welding of heat treatable aluminium alloys. The size of HAZ affects properties of a weld joint, such as e.g. hardness and strength, and it is also a factor on residual stress and deformation after welding depends.
Welding experiments were performed using material EN AW-6082 to obtain input data for numerical simulations. Calibration thermo-metallurgical numerical analyses were performed using simulation software Sysweld, where data from the standard Sysweld material database were used. Subsequently, based on information from literature and data obtained during welding experiments, some changes of parameters in Leblonds formula (which describes metallurgical transformation in HAZ) were done.
The results obtained with modified material database show that it is possible to perform numerical simulations of aluminium welding with significantly more accurate prediction of the size of the HAZ.
Keywords: numerical simulations, Sysweld, welding, aluminium alloys, heat affected zone, hardness
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NEW METHODS FOR MONITORING LASER WELDING PROCESS IN THE MANUFACTURE OF SOLAR ABSORBERS

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016125
LIBOR MRNA1,2, PETR HORNIK1,2, JAROSLAV KUBICEK2
1Institute of Scientific Instruments of the Czech Academy of Sciences, Brno, Czech Republic
2Brno University of Technology, Faculty of Mechanical Engineering, Institute of Manufacturing Technology, Department of welding, Brno, Czech Republic

e-mail: mrna@fme.vutbr.cz
Abstract
Laser welding is a modern method of fusion welding. Due to high welding speeds is necessary to use the machinery welding. This leads to the need for the detection and eventually the elimination of weld defects. Penetration laser welding is not accessible to direct observation and therefore can be monitored only indirectly. A new of possibility is the study of plasma radiation forming over the keyhole using autocorrelation analysis. The intensity of plasma radiation approaching deterministic noise, therefore, commonly used FFT analysis does not produce satisfying results. The autocorrelation function finds repetitive sequences in the signal, which are related to the oscillation of the weld pool. Changes and irregularities in the frequency of these oscillations indicate weld defects and overall stability of the welding process. A series of welding experiments were studied. After the experiments, the autocorrelation functions were evaluated. Changes in frequency during the weld were related to the geometric characteristics of the weld.
Keywords: laser welding, process monitoring, autocorrelation function
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INFLUENCE OF THE CURING PROCESS ON THE QUALITY OF POWDER COATING


MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016126
LADISLAV ZAK
Brno University of Technology, Faculty of Mechanical Engineering, Institute of Manufacturing Technology, Department of Metal Forming and Plastics,
Brno, Czech Republic

e-mail: zak@fme.vutbr.cz
Abstract
The article describes the types of the curing process and its influence on the quality of lacquer powder coating. The curing process will be analyzed on two different materials, aluminum and steel, and in three technically different kilns, followed by the comparison of the burning effect.
Keywords: technology, surface treatments, Powder Coating, powder coatings, sample, curing process, testing coatings
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APPLICATION OF MODERN TECHNOLOGIES IN PRODUCTION DESIGN OF CAR COMPONENT PROTOTYPE

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016128
JOSEF SEDLAK, PATRIK BACHORIK, ALES JAROS, ALES POLZER, MILAN KALIVODA
Brno Univesity of Technology, Fakulty of Mechanical Engineering, Institute of Manufacturing Technology
Brno,Czech Republic

e-mail: sedlak@fme.vutbr.cz
Abstract
An article deals with a design and production of a prototype component for an automotive industry. A theoretical part defines a technology of plastics injection from the point of view of selection, preparation and use of appropriate materials for plastic components fabrication. There is also defined a basic principle of activities of an injection moulding machine with a subsequent description of an issue of design and construction of injection moulds. A practical part of the article deals with a 3D model formation of the car component prototype (PC modelling in a parametric CAD software Autodesk Inventor, a control of entry data) and its production using an additive technology of Rapid Prototyping (a method of Fused Deposition Modelling – a 3D Printer uPrint). The practical part also focuses on production of the real prototype casts of the car component casted from a special binary resin. The final prototype casts are casted to a silicon mould that is made using a vacuum casting system. The article also includes a metrological measurement of the prototype components (components made using an injection moulding machine, the 3D printer and the silicon mould) using the 3D measuring device in order to evaluate of production tolerances to a given technical documentation. The article ends with evaluation of production of the prototype component with recommendations and an analysis of the most economical solution (modern technological procedures versus the aluminium mould), including final summarization of costs on the car component production.
Keywords: plastics injection, prototype component, rapid prototyping, silicon mould, resin, 3D printer, 3D measuring device
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USE OF 3D MEASURING SYSTEM ARAMIS FOR ANALYSIS OF TUBE FLARING PROCESS

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016129
EVA PETERKOVA, MARTIN SREFL
Brno University of Technology, Faculty of Mechanical Engineering
Brno, Czech Republic

e-mail: peterkova@fme.vutbr.cz
Abstract
This article analyzes the behaviour of a tube sample during the flaring process. The evaluation is carried out using non-contact 3D optical measuring system ARAMIS, which is ranked among the most modern measuring methods of deformations nowadays. The methodology of experiment including the measurement of the required values using GOM Correlate is described in this paper. The stress-strain path of an observed point was created based on the measurement values. The curves of the stress distribution and change of the wall thickness depending on the height of formed tube end were drawn too.
Keywords: tube flaring process, 3D measuring system ARAMIS, stress-strain path
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WELDED JOINT OF HIGH-STRENGTH STEELS WELDOX 700 AND COMMON GRADE STEEL S 355

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016130
JAROSLAV KUBICEK, MILAN SMAK, KAMIL PODANY, LIBOR MRNA
Brno University of Technology, Faculty of Mechanical Engineering
Brno, Czech Republic

e-mail:kubicek@fme.vutbr.cz
Abstract
High-strength steels can be effectively utilized for strengthening existing structures or to improve highly stressed elements or structural details fabricated from lower grade steel. When used together with traditional grades of steel, the favourable mechanical properties of high-strength steels open up a wide range of applications in the steel constructions of civil and engineering structures, both in primary structural elements and in individual parts. The paper is concerned with butt and fillet welded joints of components made of high-strength steel with a yield strength of 700MPa and elements made of traditional grade S355 and S235 steel. The technique for welding materials with different strengths and the choice of additive materials for welding are presented in the experimental research.
Keywords: materials technology, steel structures, strength & testing of materials
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ANALYSIS OF WELDABILITY OF DUAL-PHASE STEEL SHEETS USED IN CAR BODY PRODUCTION

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016132
LUBOS KASCAK, EMIL SPISAK, RENE KUBIK
Technical University of Kosice, Faculty of Mechanical Engineering, Institute of Technology and Materials
Kosice, Slovak Republic

e-mail: lubos.kascak@tuke.sk
Abstract
Materials used in car body production are joined by resistance spot welding as the dominant method of joining. Significant changes occur in mechanical and metallurgical properties of the weld nugget and heat affected zone during welding process. The research into these changes is very important for estimation of optimal welding parameters to ensure the required quality of welded joints. The paper deals with the problems of weldability of high strength dual-phase steel sheets used in the car body production. Dual-phase steel was developed specifically for automotive industry to benefit from its formability and crash absorption ability in comparison with conventional advanced high-strength steels. Weldability of dual-phase steel is one of the key factors governing its application in automotive industry. The influence of the resistance spot welding parameters, mainly welding current and welding time, on the weld quality was investigated by visual control, static tension test, and structural analysis of the joints and microhardness measurements.
Keywords: resistance spot welding, tension test, metallography, microhardness
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METHODOLOGY OF EVALUATION OF TOOL WEAR USING FINITE ELEMENT METHOD

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016133
VACLAV KUBEC, MICHAL DUCHEK, MIROSLAV URBANEK
COMTES FHT a.s.,
Dobrany, Czech Republic

e-mail: vkubec@comtesfht.cz
Abstract
This paper describes options available for evaluating tool wear, focusing predominantly on closed-die forging. Correct design of tools and evaluation of tool wear have a substantial bearing on the final price of a product, which is why we have been dealing with this question, striving to develop an optimal methodology for tool evaluation. Wear can be evaluated using the finite element method. However, numerical computations must always be calibrated to the material and the process conditions in question.
Keywords: tool wear, forming, closed die forging, forming tools, finite element method
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IMPROVING OF SHEARING BLADES LIFE

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016134
ZDENEK LIDMILA, KAMIL PODANY, JAN RIHACEK
Brno University of Technology, Faculty of Mechanical Engineering, Institute of Manufacturing Technology, Department of Metal Forming and Plastics,
Brno, Czech Republic

e-mail: lidmila@fme.vutbr.cz
Abstract
In the paper, design and implementation of a method for increase of shearing blades life are described. Blades for shearing of a reinforcing grip bar are made of tool steel 55WCrV8 (19 733 according to Czech Standard). Plasma nitriding method, which allows higher surface hardness while maintaining a ductile core, was chosen as an optimal method increasing blades life. A scratch pattern and a hardness measurement of initial and modified samples confirmed improvement in blade surface hardness to a value of 64 HRC.
Keywords: shearing, shearing blade, lifetime, plasma nitriding
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ANALYSIS OF COATED STEEL SHEETS’ RESISTANCE TO CORROSION AFTER PLASTIC DEFORMATION

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016135
EMIL EVIN1, MIROSLAV TOMAS1, JURAJ GRABAN2, VLADIMIR KUNDRACIK2, FRANTISEK HOLLY2, MARTIN TOTH1
1Technical University of Kosice, Department of Automotive Production, Department of Computer Support of Technology Faculty of Mechanical Engineering, Kosice, Slovak Republic
2U. S. Steel Kosice, s.r.o., USSE Research & Development, Kosice, Slovak Republic

e-mail: emil.evin@tuke.sk
Abstract
The automotive industry is influenced by customers’ requests, including safety and lifetime improvement, weight and emissions decreasing. The paper presents corrosion resistance improvement of car-body components by steel sheets coated with Zn-Al-Mg coating. Specimens coated with GI and Zn-Al-Mg coatings have been deformed by stretching (Erichsen test) and 3-point bending tests to 90 and 180. After deformation they have been tested in aggressive corrosion atmosphere of salt spray in corrosion chamber. Reached results showed better corrosion resistance of Zn-Al-Mg coatings when compared to standard Zn coating GI.
Keywords: coated steel sheet, Zn coating, Zn-Al-Mg coating, corrosion
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TWIN STRIP ELECTROSLAG CLADDING

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016136
MARIAN SIGMUND
Wirpo s.r.o., Brno, Czech Republic

e-mail: sigmund@wirpo.cz
Abstract
The internal surface of the pressure vessels employed in the petrochemistry industry is often faced with materials which are resist to corrosion. The industrial procedure that conjungates the most productivity with the smaller dilution is thatESSC (Electroslag Strip Cladding). The research wants to exceed the actual limits ofESSC process, scanning the possible advantages introduced from Multi StripTechnique Twin Type.
Keywords: pressure vessels, cladding, elektroslag strip cladding, multi strip technique twin type, deposit, creep resistant steel, corrosion, elektroslag plating, elektroslag flux, sub-arc welding
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STUDY OF THE NECESSITY OF USE OF VIRTUAL ORIGIN IN ASSESSMENT OF SELECTED FIRE PLUME CHARACTERISTICS

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016157
JIRI POKORNY1, DAGMAR DLOUHA2, PETR KUCERA3
1VSB – Technical University of Ostrava, Faculty of Safety Engineering, Department of Civil Protection, Czech Republic
2VSB – Technical University of Ostrava, Department of Mathematics and Descriptive Geometry, Czech Republic
3VSB – Technical University of Ostrava, Faculty of Safety Engineering, Department of Fire Protection, Czech Republic

e-mail: jiri.pokorny@vsb.cz
Abstract
The introduction of this article describes the significance and characteristic of the Fire Plume virtual origin, which is used in the assessment of certain local fire parameters. Based on selected characteristics for determining the rising of axial temperature, gas flow rate and mass volume of smoke in a Fire Plume, the necessity of the use of virtual origin was assessed. The results were compared using selected statistical methods. The study was done for a fire thermal outputs from 1000 to 5000 kW and heights above the flammable material surface from 5 to 50 m. Based on the delimitation of deviation acceptability limits, where the variation coefficient value was selected up to 10% and the percentage deviation up to 15%, regression power and linear functions were derive, which, based on magnitude of the released heat flow, determine the minimal height above the fuel surface at which the Fire Plume virtual origin can be omitted under presumed conditions. At the same time, there are principles affecting the necessity of use of Fire Plume virtual origin in practical applications presented which may be designs of smoke and heat systems, respectively other fire safety equipment.
Keywords: local fire, virtual origin, functional relation
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DEVELOPMENT OF ADAPTIVE ASSEMBLYPROCESSES

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016158
BRANISLAV MICIETA1, JAROMIR MARKOVIC2, VLADIMIRA BINASOVA1
1University of Zilina, Faculty of Mechanical Engineering, Department of Industrial Engineering, Zilina, Slovak Republic
2Slovak Legal Metrology, n.o., Banska Bystrica, Slovak Republic

e-mail:vladimira.binasova@fstroj.uniza.sk
Abstract
Adaptive assembly and manufacturing system (AAMS) reach intelligence and adaptation capability through the close interplay between four areas: electronics, mechanics, control and software engineering. The paper deals with the AAMS in order to accomplish enhanced adaptability to unstable environments through increased sensing capability and comprehensive control logics, able to self-optimize manufacturing performance and to realize intelligent and adaptive behaviour in assembly processes. In addition, the paper discusses with development trends of adaptive assembly processes.
Keywords: adaptive assembly processes, development trends, sustainable production, advanced industrial engineering, virtual commissioning
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STUDY ON DISINTEGRATION OF METALLURGICAL SINTER

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016159
SIMONA JURSOVA1, STANISLAV HONUS2
1VSB – Technical University of Ostrava, Centre ENET, Ostrava, Czech Republic
2VSB – Technical University of Ostrava, Centre ENET and Faculty of Mechanical Engineering, Department of Energy Engineering, Ostrava, Czech Republic

e-mail:simona.jursova@vsb.cz
Abstract
The paper deals with properties of metallurgical sinter which are significant in the view of ironmaking optimization. It aims at study of metallurgical sinter disintegration. It presents experimental procedure for disintegration testing. The paper presents results of tests carried out in gaseous environment containing 30 % of carbon oxide and 70 % of nitrogen at temperature of 550 °C. It discusses them in relation with other properties of metallurgical sinter such as basicity P2 and content of FeO. The article summaries relevant studies and extends it with actual laboratory experiments.
Keywords: sinter, reducibility, disintegration, iron-making, optimization
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DESCRIBING STATISTICAL DEVIATIONS OF PROTECTION TIMES OF LASER SAFETY BARRIERS

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016160
FLORIAN P. LUGAUER, FABIAN WIMMER, MICHAEL F. ZAEH
iwb - Institute for Machine Tools and Industrial Management, Technical University Munich, Germany

e-mail: florian.lugauer@iwb.tum.de
Abstract
Passive laser barriers are designed to protect humans from risks of laser radiation in the production environment. Manufacturers of such barriers have to guarantee the protective effect. Therefore, experiments are conducted to determine their protection times. For this purpose, some sample based approaches exist but they are not statistically reliable. An approach for the description of the distributions of protection times of passive laser safety barriers is presented to develop a statistical reliable method for the estimation of safe protection times out of few samples. The analysis result of the statistical deviations shows that the measured data can be described by a bimodal approach of two weighted normal distributions.
Keywords: laser safety, IEC 60825-4, industrial safety, protection time distribution, employment protection
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RELIABILITY CENTRED MAINTENANCE

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016161
HANA OPOCENSKA, MILOS HAMMER
Brno University of Technology, Faculty of Mechanical Engineering, Institute of Production Machines, Systems and Robotics
Department of Quality, Reliability and Safety
Brno, Czech Republic

e-mail:opocenska@fme.vutbr.cz, hammer@fme.vutbr.cz
Abstract
Reliability centred maintenance (RCM) is the method which is used for the selection of maintenance programme that can effectively achieves the required safety, standby and economy of operation. This contribution is focused on this sophisticated method and is aimed at the description steps of RCM. Moreover, the RCM project is described on an example of the production machine. The objective is to propose the most suitable maintenance system for this production machine. In this project, the specialized software AMST is used.
Keywords: reliability centred maintenance, failure mode and effect analysis, maintenance, criticality matrix, decision tree
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APPLICATION OF MODERN QMS – KAIZEN MANAGEMENT SYSTEM

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016162
HELENA CIERNA, ERIKA SUJOVA
Technical University in Zvolen, Faculty of Environmental and Manufacturing Technology, Department of Manufacturing Technology and Quality Management
Zvolen, Slovak Republic

e-mail : helena.cierna@tuzvo.sk, erika.sujova@tuzvo.sk
Abstract
Experience shows that with the exception of international manufacturing organizations operating in Slovakia and some national manufacturers, new trends, methods and information regarding quality management are rejected. Our goal is, with the help of the Kaizen method, to use acquired information from practice and available theoretical resources and to suggest approaches that can lead to a more flexible organization and improve results while utilizing the same resources. In this article we present in important contribution to management of change as a result of implementation of the Kaizen method in an organization. For better comparison, we analyze three manufacturing organizations operating in Slovakia. The Kaizen method is presented as a tool, with which we can solve a specific problem, achieve positive changes in all processes, on all organizational levels, in all organizations and with all employees of an organization.
Keywords: the Kaizen method, modern quality management systems, application
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PARAMETRIC AND NONPARAMETRIC METHODS OF STATISTICAL PROCESS CONTROL

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016163
TEREZA SMAJDOROVA, DARJA NOSKIEVICOVA
VSB - Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Department of Quality Management
Ostrava, Czech Republic

e-mail:tsmajdorova@seznam.cz
Abstract
This paper presents the limitations of classicalShewhart control charts and some possibilities of statistical process control that can be used when the basic assumptions about data have not been fulfilled. These basic assumptions that must be met include mainly a requirement on the normality of the data, the requirement for constant mean and variance, and last but not least the requirement for mutual independence of data. In practice, those assumptions about the data are not necessarily always met. The aim of this article is to introduce the problems (such as normality failure, data dependence) that can occurwhen applying the classic Shewhart control charts. Additional aim of this article is to describe some non-parametric control charts and concretely introduce one of the non-parametric control charts, namely Shewhart sign control chart, including a practical example from a metallurgical process. During preparation of this article accessible pieces of knowledge on the issue were compared. Comparing the parametric and nonparametric methods it was found that nonparametric methods have many advantages and for cases where some of the basic assumptions about the data are not met they are appropriate.
Keywords: production management, statistical process control, Shewhart control charts, nonparametriccontrol charts, Shewhart sign control chart
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BROADBAND EXCITATION OF MACHINE TOOLS BY CUTTING FORCES FOR PERFORMING OPERATIONAL MODAL ANALYSIS

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016164
JAN BERTHOLD1, MARTIN KOLOUCH2, VOLKER WITTSTOCK1,MATTHIAS PUTZ2
1Institute for Machine Tools and Production Processes, Chemnitz University of Technology, Chemnitz, Germany,
2Fraunhofer Institute for Machine Tools and Forming Technology IWU, Chemnitz, Germany

e-mail: jan.berthold@mb.tu-chemnitz.de
Abstract
The operational modal analysis (OMA) can be employed in the field of machine tools to measure the dynamic behaviour under operation conditions to observe and assess effects that only occurring during process. However, OMA requires an broadband excitation with preferably white noise characteristic. When assuming that the machining process is the main excitation source in machine tools, this requirement could not be fulfilled because of the great number of harmonic components that resultfrom spindle speed and number of teeth.
In this paper an approach is presented to generate a broadband excitation during a milling process by variating the cutting parameters, for e.g. spindle speed and immersion. Investigations are performed simulative as well as experimental and restrictions of the machine tool and the process are considered. It is shown that an broadband excitation by milling is possible only by varying cutting parameters without using a special designed work-piece.
Keywords: machine tool, operational modal analysis, dynamics, excitation, cutting forces
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THERMAL EXPOSITION MONITORING OF FIREFIGHTERS

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016165
PETR NOVAK, JAN BABJAK, TOMAS KOT
VSB-Technical University Ostrava, Faculty of Mechanical Engineering, Department of Robotics
Ostrava, Czech Republic

e-mail: petr.novak@vsb.cz
Abstract
This paper describes progress of project focused on health management and occupational safety of firefighter units’ members, especially from thermal exposition point of view. After introduction is described evolution of design of the proto-types of a pocket personal measurement device. The next part deals with the selection of precise temperature, humidity and body activity sensors. Attention is also given to power con-sumption of the device. There were made many various tests of this measurement prototype device, mostly at real case scenarios, like measurements at a thermal chamber used for firefighter’s suit testing. The last part of the paper describes software support for configuration and wireless monitoring and supervision of multiple members of a rescue team by an as-signed overseer in real time. This provides additional level of safety and can greatly help to reduce the risk of health damage caused by extreme conditions.
Keywords: measurement, safety, firefighters, thermal exposition
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APPLICATION OF AUGMENTED REALITY FOR VERIFICATION OF REAL WORKPLACE STATE

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016166
TUMA ZDENEK, KOTEK LUBOS, TUMA JIRI, BRADAC FRANTISEK
Brno University of Technology, Faculty of Mechanical Engineering, Brno, Czech Republic

e-mail: tuma@fme.vutbr.cz
Abstract
The article is aimed at verifying the state of a real workplace using virtual reality. In analyzing the readiness of virtual reality applications,augmented reality was selected for the following work. The most significant advantage of augmented reality is the implementation of a virtual model and the ability to deal with the analysis in a real environment, which is particularly beneficial in the case of productionplants. In the first phase of the work,an analysis of the current state of the workplace was carried out, where the requirements for the design of the new workplace were specified. This was followed by the phase of design preparation in 3D modeller. At this very stage it appeared to be advantageous to use virtual reality applications; in the design process,regular approval procedures are requiredas for an expert team (management, design, quality, ...), which puts high qualification requirements on the readiness of this team. In this phase, the 3D design of the new workplace was inserted into the application supported by augmented reality and some options were indicatedto deal with the ergonomic and risk analysis. The result of this work is, in particular,an extension of options in designing and analyzing production workplaces and machinery in multidisciplinary teams.
Keywords: virtual reality, augmented reality, design of production workplace
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MAINTENANCEAND TECHNICAL DIAGNOSTICS OFMACHINES

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016167
ANDREI TURYGIN, ANDRIY MOSYURCHAK, MAXYM ZHALO, MILOS HAMMER
Brno University of Technology, Faculty of Mechanical Engineering,
Brno, Czech Republic

e-mail: y159681@stud.fme.vutbr.cz
The article deals with the maintenance and technical diagnostics of machine tools. The basic knowledge about maintenance, distribution of maintenance and also important facts about the diagnostics are provided. Attention is focused on the possibility of using technical diagnostics as an instrument to improve maintenance. Article is describing an experiment in the engineering company. It proceeds from the current state of maintenance and suggests a plan of innovation. This proceeds from FMEA and FMECA analysis and the vibrodiagnostics is submitted as one of the possible methods of improving maintenance of machine tools. The article describes and evaluates the experiment and carry out recommendations for specific conditions in described company.
Keywords: maintenance, technical diagnostics,classification of maintenance,classification of technical diagnostics, vibrodiagnostics,current and predictive diagnostics, neural network, monitoring, vizualization, TPM and RCM method
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RISK ANALYSIS OF THE DRINKING WATER SUPPLY SYSTEM OF THE SMALL VILLAGE

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016168
JAN RUCKA, TOMAS SUCHACEK
Brno University of Technology, Faculty of Civil Engineering, Institute of Municipal Water Management
Brno, Czech Republic

e-mail: rucka.j@fce.vutbr.cz
Abstract
The article deals with the application of risk analysis methods to the problems of the drinking water supply by public water supply systems. The examples of a risk analysis and the prioritization of proposed corrective measures are demonstrated on the example of a small municipal water supply system. Within the project WaterRisk a detailed methodology for risk analysis of public water systems was developed, which was subsequently fully implemented in a WaterRisk.cz software tool. With the help of this software the risk analysis can be performed atlarge - complex water supply systems, as well as at the small ones - simple public water supply systems, for which the methodology is specially adapted. The result of a risk analysis is among other things also a list of remedial measures which have to be implemented in the water system in order to eliminate the identified risks. The tool was developed with a focus on prioritizing of these remedial measures, while maintaining a comprehensive approach and perspective. The practice shows that it is not possible for operators, respectively, owners of public water supply system, to eliminate all risks simultaneously. It is necessary to complete these steps gradually and split them for the longer time period. It is also necessary to take into account a wide range of external influences and circumstances that enter into the decision-making process. In the case of investment events it is usually about challenging economic projects, which play a decisive role. The decision support system based on risk analyses in this processes offers interesting possibilities of the use. Using a developed methodology is presented in the paper on a case study of a small public water system in the Czech Republic.
Keywords: drinking water, risk analysis, software, water supply system, case study
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ACCURACY ANALYSIS OF ADDITIVE TECHNIQUE FOR PARTS MANUFACTURING

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016169
RADOMIR MENDRICKY
Technical University of Liberec, Department of Manufacturing Systems and Automation,
Liberec, Czech Republic

e-mail: radomir.mendricky@tul.cz
Abstract
The article introduces accuracy analysis results of additive technique used for manufacturing of parts depending on the used Rapid Prototyping technology. The main goal of the research was to complexly analyse dimensional and shape accuracy of parts manufactured by means of the selected 3D printers, and to compare the obtained results with the parameters given by the printer manufacturers. Devices such as Stratasys Dimension SST 768 printer using the FDM principle and Objet Connex 500 using the PolyJet Matrix were used for the verification purposes. The measurement of the selected models was performed using modern optical digitisation methods, specifically by means of 3D contact-less scanners. The subsequent data evaluation and verification of the actual part compared to the nominal CAD model was performed using GOM Inspect Professional.
Keywords: additive technology, 3D Print, fused deposition modelling, polyJet matrix, geometrical accuracy, 3D optical scanner, 3D digitization
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CONTROL OF SPARE PARTS INVENTORY IN ORGANISATIONS

MM (Modern Machinery) Science Journal, November 2016
DOI:10.17973/MMSJ.2016_11_2016170
VERA PELANTOVA1, EVA SLAICHOVA2
1
Technical University of Liberec, Faculty of Mechatronics, Informatics and Interdisciplinary Studies, MTI
2
Technical University of Liberec, Faculty of Economics, KPE, Czech Republic
e-mail: eva.slaichova@tul.cz, vera.pelantova@tul.cz
Abstract
Probably every organisation focuses on obtaining very significant market positions in their field of business. The production for customers is overriding for it. However, meeting this goal is preceded by its production. Now the preparation of production is sometimes on the edge of the interests of its staff, although it is now scientifically strengthened, e.g. in the field of maintenance or materials. The maintenance needs for operation of every device simple materials and spare parts.
This article describes a pilot project of authors, carried out in the Czech Republic on a sample of selected organisations. The project deals with the control of materials and of spare parts inventory in organisations. It describes the current state of the problem and nonconformities occurring in this material field. Results of the survey are compared with findings from a brief literature research. The preparation of the device is a key part of material savings in terms of spare parts, but also from the perspective of a subsequent production. Therefore the article proposes a solution in the area of control of materials and of spare parts inventory for strengthening the competitiveness of these organisations.
Keywords: spare part, material, organisation, maintenance, supply, management system, store
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