A MODAL PARAMETER APPROACH FOR RECEPTANCE COUPLING OF TOOLS

MM (Modern Machinery) Science Journal, October_2016
DOI: 10.17973/MMSJ.2016_10_201616
C. BRECHER, P. CHAVAN, M. FEY, M. DANIELS
Laboratory for Machine Tools and Production Engineering (WZL) of RWTH Aachen University
Aachen, Germany

e-mail: p.chavan@wzl.rwth-aachen.de
Abstract
Receptance coupling methods for predicting tool point dynamics often use an adapter or calibration gauge for extracting the spindle-tool interface dynamics. This, however, necessitates the measurement of the rotation to force and rotation to moment receptances at the free end of the clamped adapter which is difficult to measure practically. The present article provides a new method for determining the rotation to moment receptance as part of the Receptance Coupling Substructure Analysis (RCSA). The formulations in the current literature, suffer from several disadvantages such as having to use several calibration gauges, complex mathematical formulations, multiple measurements of direct and cross receptances, etc. The proposed approach overcomes these disadvantages by providing a simpler formulation with only three measured receptance on a single adapter. A modal parameter approach is used which shows better prediction of the rotation to moment receptance and satisfactory conformity of the predicted TCP compliance with the measured compliance.
Keywords: receptance coupling, RCSA, modal parameters, milling tool, rotation to moment receptance
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A NEW DESIGN OF ROUGHING MILLING CUTTER AND ITS MACHINING PERFORMANCE

MM (Modern Machinery) Science Journal, October_2016
DOI:10.17973/MMSJ.2016_10_201619
MIROSLAV PISKA, ALES JAROS
Brno University of Technology, Faculty of Mechanical Engineering, Department of Manufacturing Technology
Brno, Czech Republic

e-mail: piska@fme.vutbr.cz
Abstract
This paper deals with a new roughing milling cutter design made of high-speed steel by precision casting technology. Each edge of the innovated milling cutter has two special flutes that make so-called compensation edges which help to reduce tensile stress in the end of cutting teeth. Three kinds of PVD coatings ((Al,Ti)N, (Al,Ti,Cr)N and nanocomposite nACo) were used to preserve the tool life. The coatings were made with a cathodic-arc deposition process. Machining tests were carried out on the vertical milling machine FB 32V. Cutting conditions were constant and standard carbon steel C45 DIN EN ISO 4957 (W.Nr. 1.1191) was used as workpiece material. Monitored parameters were force loading and flank wear measured with Stemi 2000 Zeiss. Dynamometer Kistler 9575B/SW DynoWare were used for measuring of instantaneous force loading in long time series. The results confirm a good cutting performance of the new tool.
Keywords: force loading, flank wear, high-speed steel, PVD coating, milling, stress analysis
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CAUSAL DEPENDENCE OF EVENTS UNDER MANAGEMENT SYSTEM CONDITIONS

MM (Modern Machinery) Science Journal, October_2016
DOI:10.17973/MMSJ.2016_10_201620
STEFAN MARKULIK1, ROBERT KOZEL2, MAREK SOLC3, HANA PACAIOVA4
1 Technical University of Kosice, Faculty of Mechanical Engineering, Department of Safety and Quality, Kosice,
Slovak Republic
2 Hakoz, s. r. o., Kosice, Slovak Republic
3 Technical University of Kosice, Faculty of Metallurgy, Institute of Materials, Kosice, Slovak Republic
4 Technical University of Kosice, Faculty of Mechanical Engineering, Department of Safety and Quality, Kosice,
Slovak Republic

e-mail: stefan.markulik@tuke.sk
Abstract:
Tools for quantitative risk assessment used in praxis are predominantly based on linear transformations. A parallel problem of current risk assessment methods is constant time and imperceptions of variability of threat over the course of time. Two specific cases of causal dependence are domino effect and synergic effect. Risk as an attribute of causal dependence is common for all present management systems. The paper deals with details of synergic effect mechanism, its identification and possible utilization in the field of safety. Risk assessment is a basic tool of every management system (at this time very important for quality management system). It enables appropriate decision making. Being prepared to manage risks involves the ability to identify them, assess them and take appropriate measures. Today’s construction does not only involve the manufacture of products but also designing procedures for other areas of human activity. There are numerous interdisciplinary methods that enable us to create new products. New products = new threats.
Keywords: causal dependence, quality, management system, risk assessment, synergic effect
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EXPERIMENTAL STUDY OF THERMOPLASTICS MATERIAL REINFORCED BY VARIOUS TYPES OF HIGH-STRENGTH FIBRES

MM (Modern Machinery) Science Journal, October_2016
DOI : 10.17973/MMSJ.2016_10_201621
LUCIA KNAPCIKOVA, SVETLANA RADCHENKO, JOZEF HUSAR, PAVOL RADIC, ANDREJ BERNAT
Technical University of Kosice, Faculty of Manufacturing Technologies with a seat in Presov, Presov, Slovak Republic
e-mail: lucia.knapcikova@tuke.sk
Abstract:
This paper aims to study the application of various types of high-strength fibres in the recycled polyvinyl butyral matrix, esp. effects of sizing on properties of differently sized. For the verification of tensile test according to standard DIN EN 527-1 we used numerical results. The reinforced material was moulded and the fibres are inserted at a distance of 3 mm and 5 mm at the middle of the matrix and subsequently again at 150 °C by 10MPa and by the pressing time, 2 minutes pressed.
Keywords: polyvinyl butyral, high-strength fibres, matrix
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THE IMPACT OF TECHNOLOGICAL PARAMETERS OF DIE CASTING TO CASTING POROSITY

MM (Modern Machinery) Science Journal, October_2016
DOI: 10.17973/MMSJ.2016_10_201623
RASTISLAV MAJERNIK, JURAJ RUZBARSKY
Technical University of Kosice, Faculty of Manufacturing Technologies, Department of Technological Systems Operation, Kosice, Slovak Republic
e-mail: rastislav.majernik@tuke.sk, juraj.ruzbarsky@tuke.sk
Abstract:
The article deals with the research of the influence of selected technological parameters of die casting on the internal structure of die-casts based on Al-Si alloys. Among the chosen technological parameters of die casting is pressing piston speed and holding pressure. Examined castings internal structure is defined by the percentage of porosity. The article described the course design and preparation of metallographic samples to be investigated by optical microscopy. The measured values are given in tabular and graphical form. At the end of the evaluation is shown the impact of individual parameters on the internal structure and quality of the castings.
Keywords: die-casting, castings, parameters, porosity, Al-Si alloy, microstructure
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BEARING TOOLS MACHINING AND NEW EXPERIMENTAL EXPRESSION OF DURABILITY DEPENDENCE FOR SINTERED CARBIDE CUTTING

MM (Modern Machinery) Science Journal, October_2016
DOI: 10.17973/MMSJ.2016_10_201631
ANTON PANDA, JAN DUPLAK, MICHAL HATALA, RUDOLF KASINEC, JOZEF STERANKA, EMA NOVAKOVA-MARCINCINOVA
Technical University of Kosice, Faculty of Manufacturing Technologies with a seat in Presov, Department of Manufacturing Technologies, Presov, Slovak Republic Comenius University, Faculty of Law, Department of Theory of Law and Social Sciences, Bratislava, Slovak Republic
e-mail: anton.panda@tuke.sk
Abstract:
Durability of the cutting tools is very complex process that is influenced by more factors. On the base of outputs and results these experiments can be completely described the most important elements acting on the resulting durability of a cutting tool. The technical science defines the basic method for determining durability of the cutting tool according to results and knowledge F. W. Taylor. This paper describes how to create and analytically express new durability dependence for sintered carbide cutting tool on the base of vc-VB dependence. This dependence consists from vc - cutting speed and VB - criterion of blunting. The whole procedure and its analytical expression is the subject of this paper.
Keywords:
durability, vc-VB dependence, sintered carbide, analytical expression, turning
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COMPARISON OF PROGRAMMING PRODUCTION OF THIN WALLED PARTS USING DIFFERENT CAM SYSTEMS

MM (Modern Machinery) Science Journal, October_2016
DOI: 10.17973/MMSJ.2016_10_201632
MICHALIK PETER, ZAJAC JOZEF, HATALA MICHAL, DUPLAK JAN, MITAL DUSAN
Technical University in Kosice with seat in Presov, Faculty of Manufacturing Technologies, Presov, Slovak Republic
e-mail: peter.michalik@tuke.sk
Abstract:
The article deals with comparing the programming of production of thin-walled parts using CAM software. Were evaluated by the number of clicks buttons and the amount of time during which the G codes generated. One side parts has been produced by the program generated by CAD applications Creo Parametric 2.0 and the other side part using Autodesk Inventor Professional HSM PRO 2016 was made on CNC vertical machining centre Pinnacle VMC 650 S.
Keywords:
thin-walled parts, CAM software, NC program, CNC machining centre
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CUTTING CERAMIC DURABILITY IN MACHINING PROCESS OF BEARINGS STEEL 100CR6

MM (Modern Machinery) Science Journal, October_2016
DOI: 10.17973/MMSJ.2016_10_201633
ANTON PANDA, JAN DUPLAK, MICHAL HATALA
Technical University of Kosice, Faculty of Manufacturing Technologies with a seat in Presov, Department of Manufacturing Technologies, Presov, Slovakia
e-mail: anton.panda@tuke.sk
Abstract:
The theory and practice in engineering industry is not the same. Durability of cutting tools is defined in standard ISO 3685. In standard ISO 3685 is defined T-vc dependence for different cutting materials and standard included process evaluation of tool durability for cutting materials made of high speed steel, sintered carbide and cutting ceramic. Standard ISO 3685 contains instructions how to create T-vc dependence for cutting tools made of cutting ceramic. In this standard are only instructions how to create T-vc dependence according to Taylor. The article compares T-vc dependencies for various cutting ceramics (Al2O3, Al2O3+ZrO2, Al2O3+TiCN) with T-vc dependence defined in standard ISO 3685, because this standard describes T-vc dependence for all entered cutting materials together.
Keywords: cutting speed, T-vc dependence, standard ISO 3685, tool durability, bearing steel 100Cr6
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EXPERIMENTAL MEASUREMENTS OF LOW-FREQUENCY MAGNETIC FIELDS IN TERMS OF SAFETY

MM (Modern Machinery) Science Journal, October_2016
DOI: 10.17973/MMSJ.2016_10_201640
MILAN ORAVEC1, MIROSLAV RIMAR2, MARCEL FEDAK2, ANDRII KULIKOV2, ADRIANA DIVOKOVA1
1Technical University of Kosice, Faculty of Mechanical Engineering, Kosice, Slovak Republic
2Technical 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:
Low-frequency electromagnetic fields and their effect on the employee are paid minimal attention. In this work will measure and describe the influence of low-frequency. Our experiments show necessity of controlling the frequency not only in devices but also on their power supply and cables. All measures were made on VEMA-041 measure equipment with computer software. Measurements were made with the respect to various aspects. From the measured gas welding unit the cable acts as the antenna with characteristic frequencies of 100 Hz and its harmonics. Due to this knowledge we can increase production efficiency of the employee and also their health will improve.
Keywords: magnetic flux density, low frequency magnetic field, personal safety, the influence of the magnetic field to a human, welding
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HEAT TRANSFER MONITORING OF INJECTION MOLD

MM (Modern Machinery) Science Journal, October_2016
DOI: 10.17973/MMSJ.2016_10_201642
JOZEF DOBRANSKY1, FRANTISEK BOTKO1, EVA VOJNOVA2
1Technical University of Kosice, Faculty of Manufacturing Technologies with a seat in Presov, Slovak Republic
21st Presov Tool Making Company, Ľubotice, Slovak Republic

e-mail: jozef.dobransky@tuke.sk
Abstract:
Presented article is focused on heat transfer in injection mold, which is designated for plastic parts production. As experimental part was selected two components injection mold with hybrid cooling. Molds cooling system was in two variants: conventional and conformal cooling. In subsequence three variants of cooling were simulated. First variant contained conventional cooling system manufactured by drilling technology. Second variant was designed with conformal cooling system which copies shape of the molding. Third variant consisted of conventional and conformal cooling combined. Simulation procedure was performed in simulation software ANSYS. Temperature presets for injected molding was set according to used material Makrolon 2805. Heat transfer between individual parts of mold was evaluated using individual probes.
Keywords: injection mold, conformal cooling, plastics molding, simulation, heat transfer
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MONITORING INFLUENCE OF SELECTED PARAMETERS ON SURFACE QUALITY AFTER POLYMER POWDER COATING

MM (Modern Machinery) Science Journal, October_2016
DOI: 10.17973/MMSJ.2016_10_201651
DUSAN MITAL, JOZEF ZAJAC, ZUZANA MITALOVA, PETER MICHALIK, MAREK KOCISKO
Technical University of Kosice with seat in Presov, Faculty of Manufacturing Technologies, Presov, Slovak Republic
e-mail: dusan.mital@tuke.sk
Abstract:
Presented article is aimed to powder coating and monitoring surface quality. Powder coating is considered as one layer surface treatment to protect against environment. Thickness of layer is several micrometers (depend on powder type) and meets high requirements and demand on surface protection against scratches, abrasion and other material specifications. Presented article is focused on experimental study of surface roughness influence on surface quality after polymer powder coating (surface roughness and coat thickness). Last part of article is aimed to statistical verify individual parameters by chi test.
Keywords:powder coating, surface roughness, milling, surface
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PROPOSAL OF MEASURING FIXTURE FOR SERIAL PRODUCTION

MM (Modern Machinery) Science Journal, October_2016
DOI: 10.17973/MMSJ.2016_10_201658
KATARINA BREZIKOVA, MICHAL HATALA, JAN DUPLAK, DUSAN MITAL, SVETLANA RADCHENKO, FRANTISEK BOTKO
Technical University Kosice, Faculty of manufacturing technologies with a seat in Presov Presov, Slovak Republic
e-mail: frantisek.botko@tuke.sk
Abstract:
Presented article is focused on monitoring of output control. Primary objective of research was design of most effective automated control of output quality for designated product. Proposal of fixture for output control was chosen as way to achieve main objective. According to performed practical analyse was intended final proposal of measuring fixture for chosen product. Manufacturing companies constantly face the problem of operational production processes and systems aimed to achieve demanded manufacturing costs of high quality products and minimizing of consumed resources. Production quality is essential in the field of intensive and emerging strategic industrial sectors as automotive, aviation, cosmonautics, energy industry, medical technology, micro-manufacturing, electronics and mechatronics. Obtaining of objective overall production quality is conditional by innovative and integrated quality, manufacturing logistics, effective maintenance, management and control methods.
Keywords: measurement, fixture, design, clamp, component
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RESEARCH ON THE DURABILITY OF SELECTED CUTTING MATERIALS IN THE PROCESS OF TURNING CARBON STEEL

MM (Modern Machinery) Science Journal, October_2016
DOI: 10.17973/MMSJ.2016_10_201660
ANTON PANDA, JAN DUPLAK, MICHAL HATALA, TIBOR KRENICKY, PETER VRABEL
Technical University of Kosice, Faculty of Manufacturing Technologies with a seat in Presov, Slovak Republic
e-mail: anton.panda@tuke.sk
Abstract:
Durability of cutting tools represent a large spectral index on the basis of which is characterized by functional work. Every manufacturer of cutting tools before the actual production of these tools during the development make a tests and prescribing them characteristics on which is possible then to predict their behaviour in the actual production process. Durability of cutting tools is often indicated for one tested material of marketing aspect, which is machined and effort of user is to achieve this variable for other machined materials and then is happened problem in the production. The problem is very short lifetime of cutting tool in machining process, where the effect is impossibility to optimize the machining process. The results of this action are excesses time caused by exchanged of cutting plate and then it is make a low production of machining industry by setting of machines, and then the factory has an economical loses. Paper notes that significant differences optimal and feasible achievable durability of the cutting tool in the machining process carbon steel. As the impact on the results of this research is not only technical but also economic and particularly for small and medium manufacturing enterprises, it is examining this issue very important and timely.
Keywords: cutting speed, durability, carbon steel, ISO 3685, sintered carbide
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SPRING-BACK PREDICTION FOR STAMPINGS FROM THE THIN STAINLESS SHEETS

MM (Modern Machinery) Science Journal, October_2016
DOI : 10.17973/MMSJ.2016_10_201663
PAVEL SOLFRONK, JIRI SOBOTKA, MICHAELA KOLNEROVA,LUKAS ZUZANEK
Technical University of Liberec, Faculty of Mechanical Engineering, Department of Engineering Technology, Liberec, Czech Republic
e-mail: pavel.solfronk@tul.cz
Abstract:
The metal forming technology is (mainly due to the automotive industry) one of the most dynamically developing branch of the engineering industry. Continuous effort to achieve the top technological level and car´s safety factor at keeping the low price level means necessity to still implement into the own production process the newest mathematical models of these technological processes. Thus these days represents utilization of the numerical simulations an essential part for the car shape lay-out design, for determination the basic technological operations and also e.g. for stamping tools shape optimization. Alongside such implementation of the newest materials into production reveals necessity to develop new and more precise computational models of materials deformation behavior as well as models designed for spring-back prediction. Nowadays, in the branch of the metal forming technologies, there are several truly top software among which also belongs software PAM-STAMP 2G. In this article is evaluated influence of the computational model on the numerical simulation accuracy by PAM-STAMP 2G at the spring-back prediction. For the deformation analysis it was chosen stainless sheet material DIN 1.4301 and for the spring-back prediction were used two anisotropic computational models termed as Hill-48 and Vegter in combination with the kinematic hardening model termed as YOSHIDA UEMORI. Accuracy of the measured results from the individual computational models is evaluated by the compliance of the carried out experiment and results from the numerical simulations. For the own experiment was chosen test where material is drawn over the drawbead and drawing edge.
Keywords:spring-back, numerical simulation, computational model, stainless sheet
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EFFECT OF HIGH BETA IRRADIATION ON MECHANICAL PROPERTIES OF SURFACE LAYER OF INJECTION MOULDED LOW DENSITY POLYETHYLENE (LDPE)

MM (Modern Machinery) Science Journal, October_2016
DOI: 10.17973/MMSJ.2016_10_201675
TOMAS FIALA, DAVID MANAS, MIROSLAV MANAS, MARTIN OVSIK
Tomas Bata University in Zlin, Czech Republic
e-mail: dmanas@ft.utb.cz
Abstract:
The influence of high doses of beta radiation on the changes in the structure and selected properties (mechanical and thermal) polymers were proved. Using high doses of beta radiation for low density polyethylene (LDPE) and its influence on the changes of mechanical properties of surface layer has not been studied in detail so far. The specimens of low density polyethylene (LDPE) were made by injection moulding technology and irradiated by high doses of beta radiation (0, 132, 165 and 198 kGy). The changes in the microstructure and micromechanical properties of surface layer were evaluated using FTIR, WAXS and instrumented nanohardness test. The results of the measurements showed considerable increase in mechanical properties (indentation hardness, indentation elastic modulus) when the high doses of beta radiation are used.
Keywords: low density polyethylene (LDPE), cross-linking, nano-hardness, nano-indentation, surface layer
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VERIFICATION OF THE IMPACT OF FINISHING TECHNOLOGY ON THE SURFACE ROUGHNESS

MM (Modern Machinery) Science Journal, October_2016
DOI: 10.17973/MMSJ.2016_09_201676
GERHARD MITAL, JURAJ RUZBARSKY
Institute of manufacturing technology, Department of operation of manufacturing processes, Presov, Slovak Republic
e-mail: gerhard.mital@tuke.sk, juraj.ruzbarsky@tuke.sk
Abstract:
The article is focused to compare and evaluate different finishing technologies, such as milling and ISF technology, which are isotropic super fine machining. There were compared two gears manufactured by the same technologies, processes and made of the same material, in the company ZTS Sabinov, however, different finishing technologies were used on each wheel. Both gears are machined by milling and grinding on one of the wheels was used finishing technology ISF. Measurement and evaluation proved that the ISF technology has a strong influence on the final surface roughness.
Keywords: roughness, surface, gear, measurement, technology, parameters
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CROSS-LINKED LOW DENSITY POLYETHYLENE MECHANICAL PROPERTIES AFTER TEMPERATURE LOAD AT 110, 180 AND 220 °C

MM (Modern Machinery) Science Journal, October_2016
DOI: 10.17973/MMSJ.2016_10_201677
PAVEL STOKLASEK, ALES MIZERA, MIROSLAV MANAS AND MARTIN BEDNARIK
Tomas Bata University in Zlin, Czech Republic
e-mail: mizera@fai.utb.cz
Abstract:
Radiation processing of polymers is a well-established and economical commercial method of precisely modifying the properties of polymers, especially mechanical properties. The mechanical properties of modified low density polyethylene samples by beta rays were measured at the ambient temperature and after temperature load above the pure low density polyethylene melting temperature. The tested samples showed significant changes of mechanical behaviour before and after temperature load. From this point of view, new applications could also be seen in areas with service temperatures higher than their former melting point, especially for application with short time exposure of temperature load.
Keywords: mechanical properties, tensile test, radiation cross-linking, beta rays, low density polyethylene and temperature stability
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THE BEHAVIOUR OF CROSS-LINKING FILLED PBT MEASURED BY NANO-HARDNESS

MM (Modern Machinery) Science Journal, October_2016
DOI: 10.17973/MMSJ.2016_10_201678
MARTIN OVSIK, VOJTECH SENKERIK, DAVID MANAS, MICHAL STANEK
Tomas Bata University in Zlin, Czech Republic
e-mail: ovsik@ft.utb.cz
Abstract:
Radiation crosslinking of filled PBT is a well-recognized modification of improving basic material characteristics. Radiation, which penetrated through specimens and reacted with the cross-linking agent, gradually formed cross-linking (3D net), first in the surface layer and then in the total volume, which resulted in considerable changes in specimen behaviour. The specimens of 30% glass fiber filled PBT were made by injection moulding technology and irradiated by doses of beta radiation (0, 33, 66 and 99 kGy). The change of nano-mechanical properties is greatly manifested mainly in the surface layer of the modified PBT where a significant growth of nano-mechanical values can be observed. Indentation modulus increased from 1.1 to 1.8 GPa (increasing about 64%) and indentation hardness increased from 56 to 85 MPa (increasing about 52%).The results of the measurements showed considerable increase in nano-mechanical properties (indentation hardness, indentation elastic modulus, indentation creep) when beta radiation are used.
Keywords: glass fiber, polybutylene terephthalate (PBT), cross-linking, nano-hardness, nano-indentation
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EFFECT OF LENGTH OF GLASS FIBERS IN RECYCLED POLYPROPYLENE ON MECHANICAL PROPERTIES

MM (Modern Machinery) Science Journal, October_2016
DOI: 10.17973/MMSJ.2016_10_201679
VOJTECH SENKERIK, MICHAL STANEK, DAVID MANAS, ADAM SKROBAK
Tomas Bata University in Zlin, Czech Republic
e-mail: vsenkerik@ft.utb.cz
Abstract:
This article investigates the effect of recycled material particle size on the resulting mechanical properties of products. The product material was polypropylene with glass fibers. Recycled material was prepared by mechanical way of recyclation, then it was categorized by sieve analysis to different size of particles. After preparation, the samples were subjugated to mechanical tests. The samples were subjected to the Charpy impact test, the hardness of Shore D test. Testing was conducted at ambient temperatures. The effect of reprocessing of the material is mainly represented by fiber shortening. As a result, considerable reduction of mechanical properties can be observed.
Keywords: recycling, sieving, particle size, glass fiber, polypropylene, tensile properties
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DETERMINATION OF OPTIMAL PRODUCTION VOLUME RESPONDING ENVIRONMENTAL CRITERIA

MM (Modern Machinery) Science Journal, October_2016
DOI: 10.17973/MMSJ.2016_10_201680
MIROSLAV BADIDA1, LYDIA SOBOTOVA1, RUZENA KRALIKOVA1, ANNA BADIDOVA1, MARIAN HURAJT1, TOMAS KONKOLY2,
1Technical University of Kosice, Faculty of Mechanical Engineering, Department of Process and Environmental Engineering, Kosice, Slovak Republic
2Magneti Marelli Slovakia,s.r.o., Industrial Park, Kechnec, Slovak Republic

e-mail: lydia.sobotova@tuke.sk
Abstract:
Environmental protection, quality requirements for products, eco –design of materials, increasing of production volume and market competition force the manufacturers to adapt to these requirements and also to economic issues.
A mathematical method is applied to the solution of this problem. The individual factors of environmental and economic character are expressed by means of different equations having universal validity. The most important factor of the given ones is the so called natural capital, alias natural resources. They are derived from the environment. Each of summarized criterions is represented by its graphical form. An application to the automotive industry closes the paper.
Keywords: optimal production volume, environmental criteria, mathematical modelling, eco-design, environment
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CORPORATE SOCIAL RESPONSIBILITY AND SELF-REGULATION

MM (Modern Machinery) Science Journal, October_2016
DOI:10.17973/MMSJ.2016_10_201681
HAMED ALAVI1, PATRYCJA HABEK2, HELENA CIERNA3
1Tallinn Law School, Tallinn University of Technology, Tallinn, Estonia
2Silesian University of Technology, Faculty of Organization and Management, Institute of Production Engineering, Zabrze, Poland
3Technical University in Zvolen, Faculty of Environmental and Manufacturing Technology Department of Manufacturing Technology and Quality Management, Zvolen, Slovak Republic

e-mail: patrycja.habek@polsl.pl
Abstract:
In the field in Corporate Social Responsibility (CSR), international private regulation or self-regulation refers to numerous regulatory frameworks. Soft Law is the other definition which is often used for private regulation. However, some scholars distinguish them from each other. Different examples of International Private Regulations in field of CSR can be mentioned as frameworks for monitoring, codification and certification of firm’s compliance with different environmental, labour, human rights and anti-corruption standards. Such frameworks have cross boundary effect and in contrast with treaties are the product of collaboration among enterprises and NGOs. This paper will try to compare and contrast numerous aspects of public and private regulations, and provide answers for questions regarding different types of international private regulations, their advantages and disadvantages in field of Corporate Social Responsibility. As a result of the study in the paper was also presented the most popular CSR initiatives including some industry driven initiatives assigned to a specified groups of international private regulations.
Keywords: CSR, international private regulations, public regulations, soft law, industry driven regulations
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APPLICATION OF QUALITY ENGINEERING IN ASSESSMENT OF MINING TECHNICAL EQUIPMENT FAILURE

MM (Modern Machinery) Science Journal, October_2016
DOI:10.17973/MMSJ.2016_10_201682
WITOLD BIALY1, PAVEL BENO2
1Silesian University of Technology, Faculty of Management and Organization, Institute of Production Engineering, Zabrze, Poland
2Technical University in Zvolen, Faculty of Environmental and Manufacturing Technology, Zvolen, Slovak Republic

e-mail: pavel.beno@tuzvo.sk
Abstract:
Hard coal mining is characterised by the complexity and specificity of problems related to the use of machines. These problems, which occur at the stage of design, construction and production of machines, build up when the machines are being used. The process of most effective hard coal mining is considerably influenced by reliable mining machines. Every downtime due to a failure translates into the effectiveness of the whole mining process. For this reason the mining industry is searching for new methods and tools which would allow it to improve the production (mining) process in a hard coal mine. The article presents one of the quality management tools used in various industry branches – a Pareto chart, by means of which downtimes in the work of cutter-loaders has been analysed. This tool allowed classifying the causes of particular failures as well as showing which of them are the most significant and which should be removed first.
Keywords: failure frequency, quality management tools, mining machine, Pareto chart
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IDENTIFICATION OF PENDULUM OSCILLATION PARAMETERS USING MEMS ACCELEROMETER

MM (Modern Machinery) Science Journal, October_2016
DOI:10.17973/MMSJ.2016_10_201685
PETER KOLEDA, MARIA HRCKOVA, MIROSLAV ADAMIK
Technical University in Zvolen, Faculty of Environmental and Manufacturing Technology, Department of Machinery Control and Automation, Zvolen, Slovak Republic

e-mail: peter.koleda@tuzvo.sk
Abstract:
The article deals with analysis of problematic focused on identification of pendulum oscillation parameters. Theory is based on mathematical description of physical pendulum with real damping and kinematics theory. The article describes experimental laboratory model of physical pendulum with precise construction. Simultaneously it describes wireless sensor system with dual axis MEMS accelerometer, which is used for components accelerations measurement of free oscillating pendulum arm. The article presents methodology for solution which is based on expression of boundary conditions and follows prediction of actual angle displacement in next period of oscillation. Experimental measurement and its subsequent evaluation determine properties and usefulness of principles of measurement and evaluation in purposes of control and visualization. Final evaluation offers suggestions for future improvement of described method.
Keywords: physical pendulum, damped oscillation, mems accelerometer, wireless sensor system
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VIRTUAL REALITY AND VEHICLE DYNAMICS IN UNREAL ENGINE ENVIRONMENT

MM (Modern Machinery) Science Journal, October_2016
DOI:10.17973/MMSJ.2016_10_201688
JAROSLAV MATEJ
Technical University in Zvolen, Department of Mechanics, Mechanical Engineering and Design, Zvolen, Slovak Republic
e-mail: jaroslav.matej@tuzvo.sk
Abstract:
The paper is aimed on a vehicle dynamic simulation from scratch, using equations of motion solved by Runge-Kutta algorithm. The vehicle and a terrain interact in a game environment Unreal Engine, using line-trace functionality. All the scene objects are created in Creo Parametric, 3ds Max and Unreal Editor systems. The vehicle can be controlled by a keyboard and a racing steering wheel with pedals. The system allows free driving on the terrain in game-like style, recording and playback functions. All the computed parameters like vehicle’s locations, rotations, forces, velocities and accelerations can be recorded and saved into file during free drive. Then the data can be visualized in playback mode, with displayed forces, in 2D space and 3D by means of virtual reality headset HTC Vive. Virtual reality allows the user a full spatial view on the vehicle’s behavior.
Keywords: vehicle dynamics, vehicle simulation, unreal engine, C++, virtual reality, virtual test facility
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ANALYSIS OF SELECTED CUTTING INSERTS IN TERMS OF THEIR COMPOSITION AND WEAR

MM (Modern Machinery) Science Journal, October_2016
DOI:10.17973/MMSJ.2016_10_201689
NATASA NAPRSTKOVA, JAROMIR CAIS, JAN SVIANTEK
Jan Evangelista Purkyne University, Faculty of Production Technology and Management, Department of Techmology and Material Science, Usti nad Labem, Czech Republic

e-mail: naprstkova@fvtm.ujep.cz
Abstract:
The use of cutting inserts is currently a normal part of the manufacturing process. The article deals with structural and material analysis of selected inserts and resulting wear after their use. These analyzes are part of the extensive research carried out at the Faculty of Production Technology and Management of Jan Evangelista Purkyne University in Usti nad Labem. Machining been hardened steel class 16 343 according to CSN 41 0002. For the used VBD were implemented SEM and EDX analysis.
Keywords: turning, cutting insert, electron microscopy, SEM, EDX
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ANALYSIS PERFORMANCE CHARACTERISTICS OF CENTRIFUGAL PUMPS

MM (Modern Machinery) Science Journal, October_2016
DOI :10.17973/MMSJ.2016_10_201691
MOHAMMAD EMAL QAZIZADA1, VLADISLAV SVIATSKII2, PAVOL BOZEK3
1Technical University in Zvolen, Faculty of Environmental and Manufacturing Technology, Department of Machinery Control and Automation, Zvolen, Slovak Republic
2Department Technology of mechanical engineering and instrument making, Votkinsk Branch, ISTU of the name M.T. Kalashnikov, Izhevsk, Russia
3STU Bratislava, Faculty of Materials Science and Technology, Institute of Production Technologies, Trnava, Slovak Republic

e-mail: pavol.bozek@stuba.sk
Abstract:
Centrifugal pump characteristics at different pump operating speeds are important for the successful operation of pumps in various areas of technology. In paper the pump characteristics are discussed to calculate the characteristic functional curves H = f (Q), Pw = f (Q), Pf = f (Q), η = f (Q) of given type of pump, specific work and flow of fluid at different frequencies of rotation, to demonstrate the connection of centrifugal pumps in serial and parallel, to product map of characteristic curves with an ISO efficiency curve and to verify the similarity rules for pumps. Using calculation focused analyses the behavior of individual characteristic curves of the pump, to find how the ISO efficiency curve can be applied for the determination of the most efficient frequency of a pump rotation. Based on calculation will be decided when to connect the pumps in series or in parallel.
Keywords: map of characteristics curves, efficiency, power, NSPH
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TURNING OF MATERIALS WITH HIGH-SPEED ABRASIVE WATER JET

MM (Modern Machinery) Science Journal, October_2016
DOI:10.17973/MMSJ.2016_10_201692
LIBOR SITEK, PETR HLAVACEK
Institute of Geonics of the CAS, v.v.i. Department of Material Disintegration, Ostrava - Poruba, Czech Republic
e-mail: libor.sitek@ugn.cas.cz
Abstract:
The paper describes and analyses own experiences concerning technology of turning by high-speed abrasive water jet. Technology development as well as present stay-of–the-art in given area are introduced in brief. Possibilities of application of such machining method especially in the area of hard and difficult-to-machine materials as well as rocks and wood are discussed.
Keywords: abrasive water jet machining, turning, steel, rock, wood
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METHODOLOGY PROPOSAL FOR IDENTIFYING LIFE-CYCLE COSTS (LCC) OF MULCHERS OF UNDESIRABLE GROWTH

MM (Modern Machinery) Science Journal, October_2016
DOI : 10.17973/MMSJ.2016_10_201693
ERIKA SUJOVA, HELENA CIERNA, RICHARD HNILICA
Technical University in Zvolen, Faculty of Environmental and Manufacturing Technology, Department of Manufacturing Technology and Quality Management, Zvolen, Slovak Republic

e-mail: erika.sujova@tuzvo.sk
Abstract:
Management of life-cycle costs is an approach that leads to sustainable development and effective use of company’s resources. By using the life-cycle cost method analysis - LCC creates a foundation for complex evaluation of costs of a product from its conceptions to the end of its life-cycle. In the introduction, we present a general scheme of a life-cycle cost analysis and calculation of costs. The analytical part includes a description of two types of analysed equipment - mulchers- AHWI FM 600 profi and Seppi m_ Midifrost dt 250. Specific relevant criteria were identified that can be used to evaluate life-cycle costs (LCC) of the above-mentioned equipment. Further, we outlined results of data collection and primary evaluation of this data. The goal is to create a platform for economic evaluation of increase in life-cycle of analysed initial and adjusted equipment based on specifically proposed methods.
Keywords: Life-Cycle Costs (LCC), Mulcher of Undesirable Growth, Relevant Costs
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INFLUENCE OF THERMAL MODIFIED PINEWOOD ON THE QUALITY OF MACHINING AT PLAIN MILLING

MM (Modern Machinery) Science Journal, October_2016
DOI : 10.17973/MMSJ.2016_10_201695
MAREK VANCO1, ANDREJ MAZAN1, STEFAN BARCIK1, LUBOMIR RAJKO1, VLADO GOGLIA2
1The Department of Machinery Control and Automation, Faculty of Environmental and Manufacturing Technology, Technical University in Zvolen, Slovak Republic
2The Department of processes Engineering, Faculty of Forestry, University of Zagreb, Croatia

e-mail: mvanco87@gmail.com, vgoglia@sumfak.hr
Abstract:
Article assess the effect of thermal modification on the surface roughness (Ra) after the face milling of pinewood (Pinus sylvestris) at different cutting conditions. The experiment was performed with samples modified at four temperatures (T = 160 °C, 180 °C, 210 °C and 240 °C), at three feed speed (vf = 6, 10 , 15 m.min-1), at three cutting speeds (vc = 20, 40, 60 m.s-1) and at positions of three angles (γ = 15°, 20°, 30°). The roughness measurement was executed by a non-contact method using a laser profilometer LPM - 4. It was found the importance of influence of studied factors affecting the surface finish in the order: heat treatment, feed speed, cutting speed, angular geometry.
Keywords: flat milling, thermo-wood, quality of surface, cutting terms
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LOGISTICS OF EXPERIMENTING WITH STRENGTHENING THE SURFACE LAYERS OF MACHINE PARTS

MM (Modern Machinery) Science Journal, October_2016
DOI: 10.17973/MMSJ.2016_10_201699
NAQIB DANESHJO, MILAN MAJERNIK
University of Economics in Bratislava Faculty of Business Economics with seat in Kosice, Slovak Republic
e-mail: daneshjo47@gmail.com, milan.majernik@euke.sk
Abstract:
The authors within the scientific contribution present the logistics of laboratory experimenting with strengthening the stressed surface layers of machine parts. The project for strengthening the surface layers was conducted without the use of ultrasonic strengthening via the newly developed device with a static pressing force. Emphasis was placed on the stage of identification of samples surface layers, their microstructure, roughness and hardness after lathe turning and shot peening as well as on the wear of the used forming element after shot peening. The process of experiment results in the modelling of technological conditions and parameters of a newly-designed and verified technology with formulating the logistics steps for practical use.
Logistics can be seen, in addition to a structured arrangement of relationships and activities, as a control system process able to efficiently use available resources in terms of time and value within the various activities at the lowest costs incurred.
Keywords: logistics, experimenting, technological process, strengthening of the surface layers, roughness and hardness of the parts, modelling
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