MM Science Journal, March 2020

March 2020

FOREIGN WORKERS IN INDUSTRY – PREVENTION OF ACCIDENTS

Petr Travnicek, Lubos Kotek, Eva Pavlikova, Petr Junga, Juraj Ruzbarsky
Keywords:   Mg alloy | recommendation | industry | foreigners | safety

The increasing need for a labour in the Czech Republic and other countries of Central Europe will lead to employing of foreigner workers. It is possible to assume that foreigners will be employed in positions, where the chosen decision can result in major accidents with fatal injuries followed by environmental or a property damage. These actors include operators in chemical or power plants, etc. As can (…)

COMPARISON OF FEM AND FVM FOR THE NUMERICAL SIMULATION OF FORGING PROCESS

Jan Rihacek, Eva Peterkova, Michaela Cisarova, Jaroslav Kubicek
Keywords: simufact forming | bearing ring | forging | finite volume method | finite element method

The paper deals with a study and a comparison of numerical simulations of a bearing ring production using various numerical methods for solution. The bearing ring is produced by forging technology in three operations. The study is focused on the first two operations, i.e. upsetting and forging of the final shape of the part. Numerical simulation of the mentioned manufacturing process is performed in Sim (…)

5-AXIS DRY MILLING OF BOTTOM OF POCKET BY BALL AND CIRCLE-SEGMENT END MILLS

Ales Polzer, Vit Sebesta, Tomas Trcka
Keywords: circle-segment end mill | force measurement | machined surface | CNC programming | hyperMILL

At present, 5-axis machining is often realized with ball end mills that do not achieve the advantages of modern circle - segment end mills. However, to exploit the potential of these modern tools, it is necessary to use a special CAM software, including hyperMILL from Westcam. This software, increasing the efficiency of machining, was used in the present study, which compared these tools with respect to (…)

UNIVERSAL MACHINE FOR PROTOTYPE PRODUCTION

Antonin Durna, Jiri Fries
Keywords: Spindle | printed circuit board | engraving | 3D printer

With development of new technologies the production is growing as well. Considering this the emphasis is placed on effectiveness and speed with which it is possible to test and make a new product. A 3D printer is an ideal utility in the area of prototyping. It is applicable for fast production of covers, ergonomic component and also small function elements. It is often necessary to design simple electro (…)

CASE STUDY OF REAL MANUFACTURING SYSTEM IMPROVING THROUGH SIMULATION MODELS

Erika Sujova, Roman Bambura, Helena Cierna
Keywords:   cartesian coordinates | industry 4.0 | improving | output statistics | production line | simulation model

The paper deals with a real manufacturing system improving through simulation models creation. The aim of the paper is to present the possibilities of simulations models as a tool for optimization and quantification of proposals to improve production lines in engineering production. The research is carried out as a case study of a production plant in a Slovak machine-building company dealing with the co (…)

CUTTING FORCE MODELLING WITH EFFECTS OF CUTTING TOOL GEOMETRY AND TOOL WEAR IN MILLING OF DIN C45 STEEL

Jaroslav Kovalcik, Pavel Zeman, Frantisek Holesovsky, Jan Madl, Ludmila Kucerova
Keywords: C45 steel | tool wear | specific cutting force | cutting force | milling

This paper focuses on mathematical modelling of cutting force with tool wear effect for milling by milling heads. With regard to a small number of experiments with sufficient accuracy, universality, speed and applicability in practice, a mathematical model based on the specific cutting force and cutting area was created. The proposed mathematical model is more refined than other models owing to more acc (…)

ANALYSIS OF FORCES INDUCED BY COATED CUTTING TOOLS AT WET AND DRY GROOVING OF HARDENED STEEL

Miroslav Piska, Petra Sliwkova
Keywords: hardened steel | dry machining | cutting forces | Al0.6)N | (Ti0.4 | Al)N | (Ti | PVD coatings | Grooving

The paper deals with a CNC grooving of hardened low-alloyed steel in flood and dry cutting conditions. A new generation of nanocomposite PVD coatings (Ti,Al)N and (Ti0.4,Al0.6)N deposited on WC-Co carbide when cutting at high cutting speed was characterized and compared. The statistical analysis of force time series acting during the machining, wear and tool life of the cutting tools have been assessed. (…)

DESIGN AND PRODUCTION OF EYE PROSTHESIS USING 3D PRINTING

Josef Sedlak, Ondrej Vocilka, Martin Slany, Josef Chladil, Ales Polzer, Matus Varhanik
Keywords: Stratasys J750 | PolyJet | 3D printing | artificial eye | Eye prosthesis

The paper deals with the production of a prototype of aesthetic eye prosthesis using procedures related to reverse engineering technology. Due to the complexity of the prosthesis shape, the 3D model was obtained by scanning a hand-made acrylic prosthesis on the ATOS Compact Scan. Following the pattern of manual production, the model geometry underwent a modification in 3ds Max software, where a planar s (…)

3D PRINTED BELT WHEELS FOR USE IN DESIGN OF BICYCLES

Patrik Sniehotta
Keywords: Belt drive | 3D printing | Cost

The article describes how it is possible to use 3D printing for printing belt wheels for bicycles. New categories of bikes keep appearing in the market. For the use, specially cities that are bikes, that use belt instead of a traditional chain. With new generations of belts, this power transmission can be used on mountain bikes. But a belt-driven bike must have a special frame, because the belt cannot b (…)

OPTIMIZATION COATING OF CYLINDRICAL TOOLS WITH FIXTURE FOR INCREASING MACHINE CAPACITY

Tomas Szotkowski, Ivan Mrkvica, Filip Kowalovski
Keywords: capacity | fixture | PVD | coating

The coating technology is integral part of industrial production. In the tooling field, coating is an essential part. For the vast majority of tooling materials today, a coating that has abrasion resistance, high hardness, high temperature stability, as well as overall wear resistance of the cutting edge is a matter of course and necessity. However, coating machines are designed for a maximum predetermi (…)

DEVELOPMENT OF FIRST AND SECOND GENERATION OF ROTARY MODULE WITH AN UNLIMITED DEGREE ROTATION

Lukas Hrivniak, Peter Demec, Jozef Svetlik, Michal Sasala
Keywords: bearing | URM | rotary module | Modular principle

The article deals with the development and changes that have been made to the rotary module with an unlimited degree rotation of first and second generation called URM. The proposed solution of module is suitable for machines and equipment that require unlimited freedom of rotation. URM is based on a modular principle. At first part the article describes design and development of the module prototype, i (…)

EVALUATION OF EROSION PERFORMANCE OF ABRASIVE PARTICLES IN ABRASIVE WATER JET CUTTING PROCESS

Petr Hlavacek, Libor Sitek, Josef Foldyna
Keywords: focusing tube | erosion performance | abrasive water jet

Abrasives are an integral part of the abrasive water jet (AWJ) technology and have a significant impact on the efficiency and economy of the cutting process. The abrasive particles are accelerated by the water jet and transported to the point of their interaction with the cut material. There are many factors influencing the determination of the abrasive type to be used in the AWJ process. In this study (…)

AN ANALYSIS OF THE EFFICIENCY OF METHODS OF TEMPERATURE ERROR CORRECTION IN SURFACE TEXTURE MEASUREMENTS

Wlodzimierz Makiela, Jacek Swiderski, Krysztof Stepien
Keywords: profile filtering | temperature effect | stylus profilometer | contact measurement | surface texture

texture are periodical changes of environmental temperature that are associated with the mode of operation of airconditioning systems applied in metrological laboratories. Temperature changes are the reason of appearing of additional waviness components in the measurement result. Research activities aiming at elimination of this type of error from measurement results have been conducted for a few years (…)

CONDUCTIVE MATERIAL PROPERTIES FOR FDM ADDITIVE MANUFACTURING

Juraj Beniak, Peter Krizan, Milos Matus
Keywords: tensile strength | fused deposition modelling | 3D printing | additive manufacturing | Conductive material

Additive Manufacturing technologies use different materials for producing of design parts. Most used technologies of additive manufacturing are Fused deposition modelling (FDM) which use plastic wires for deposition of parts layers. There are also others technologies which use for example resins, paper, plastic powder but also steel and producing of parts from metal powder. Also in plastic materials is (…)

EXPERIMENTAL SETUP FOR ANALYZING FUNDAMENTALS OF CUTTING PROCESSES USING A MODULAR SYSTEM

Florian Wöste, Jonas Baumann, Jim A. Bergmann, Rafael Garcia Carballo, Petra Wiederkehr
Keywords: modular experimental setup | cutting fundamentals | process dynamics | oblique cutting | orthogonal cutting

Machining operations like milling exhibit complex process kinematics, which restricts the identification and analysis of fundamental cause-effect interrelations. In order to differentiate the impact of relevant process parameters, a reduction of influencing factors is necessary. For this purpose, a cutting operation with a linear cutting motion, like orthogonal cutting, is beneficial. Such an experiment (…)

MODIFICATION OF CUTTING TOOLS BY DRAG FINISHING

Jozef Peterka, Peter Pokorny, Stefan Vaclav, Boris Patoprsty, Marek Vozar
Keywords: drag finishing | cutting edge preparation | cutting edge radius | tool wear

The paper deals with a progressive method of modification of cutting tools by drag finishing process. The subject of the research is the dependence of the drag finishing time on the size of the cutting edge radius. The milling tool – solid cemented carbide mill was made on a tool grinder REINECKER WZS 60. The cutting tool was drag finished on the OTEC DF-3 TOOLS drag finishing machine. The measurements (…)

ORIGIN AND SPREADING OF CRACKS DUE TO THERMAL FATIGUE IN CASE OF METAL MOLDS

Juraj Ruzbarsky
Keywords: die casting

For heating T of the die material is valid where the thermal diffusivity of the die material is exercised by deciding method. The stress of the die material by heating from the die casting liquid metal depends mainly on physical properties of the die material when the value of the calculated stress does not exceed the yield point. Also derived with help of dislocations write the die life till the origin (…)

DIMENSIONAL OPTIMIZATION OF THE ROBOTIC ARM TO REDUCE ENERGY CONSUMPTION

Vladimir Mostyn, Daniel Huczala, Wojciech Moczulski, Anna Timofiejczuk
Keywords: optimization

This study examines selected components of the optimization function, used to evaluate the optimal kinematic structure of a robot for a given task. Automated generation of the kinematic structure is based on scalable drive modules of the joints and modules of the carrying arms with a check on the permissible torque of the drive and bending moment of the carrier element. An optimization algorithm is used (…)

LABORATORY ANALYSIS OF HARDFACING MATERIAL APPLIED BY PLASMA AND TIG WELDING

Miroslava Tavodova, Ladislav Talat, Veronika Skuletyova
Keywords: microgrooving | microcutting | Microstructure | forestry tools | abrasive wear | TIG | plasma welding

There is not so much research on the issue of the wear of forestry tools as on tools used in agriculture, mining or construction. However, in a heterogeneous environment, they are subject to abrasive and shock loads. The large number (48 pieces) of tools used at the same time, based on base machine adapters, their rapid wear and the high price of a new tool (approx. 70 Eur), is the reason why it is nece (…)

ACCURACY OF MACHINE TOOLS

Pavel Dostal, Marek Sadilek, Jaroslav Dubsky, Pavel Szkandera
Keywords: working accuracy | geometry | accuracy | measurement | machine-tool

The accuracy of milling centre geometry is a basic condition for successful application in practice. Users of modern centres have to deal with the issue of measuring accuracy using in the production program. The desired results are achieved by careful preparation both before and during adjustment operations. These rules apply to all applications for new machines, but also to machines after collision or (…)

DESIGN AND MANUFACTURING OF CUTTING TOOLS FOR MILLING

Jozef Peterka, Jakub Hrbal, Ivan Buransky, Marek Vozar
Keywords: cemented carbide | the tool geometry | superalloys | the cutting tools | grinding

The paper deals with the design and manufacturing of a cutting tool for milling alloy Inconel 718. The tool geometry was obtained by optical scanning method. The tool from SECO Company was used as reference. The cutting tool was manufactured on a WZS 60 REINECKER tool grinding machine. Geometric parameters were checked and compared by means of optical measuring instrument ZOLLER Genius 3s.

COMPARISON OF THE EFFECT OF THE APPLIED ENERGY ON THE PROPERTIES OF PROTOTYPES MADE FROM DIFFERENT TYPES OF POWDER MIXTURES

David Bricin, Antonin Kriz
Keywords: porosity | eta phase | cemented carbides | WC-Co | SLM technology

The paper deals with the influence of different types of WC-Co powder mixtures processed by SLM technology on the final properties of the prototype build. The powder mixtures used differed in the morphology of the powder particles, i.e. the shape, size and chemical composition of the individual powder particles. In total, two different types of WC-Co powder mixtures were used for the experiment. The stu (…)

APPLICATION OF LASER SURFACE POLISHING ON ADDITIVE MANUFACTURED PARTS OF INCONEL 718 NICKEL-BASED SUPERALLOY

Martin Bures, Miroslav Zetek
Keywords: surface roughness | Inconel 718 | Continuous wave régime | Pulsed régime | additive manufacturing | Laser polishing

This article deals with the influence of laser polishing parameters on the final surface quality of nickel-based superalloy Inconel 718 produced by metal additive manufacturing. The aim is to optimize the laser polishing process parameters to reduce the surface roughness of the sample. The investigated parameters of the laser are scanning speed, frequency, focal length, and pulsed and continuous wave re (…)

SAFETY REQUIREMENTS RELATED TO COLLABORATIVE ROBOTS IN THE CZECH REPUBLIC

Tomas Broum, Michal Simon
Keywords: Czech Republic | Technical Standards | Legislative | Safety Requirements | collaborative robot

The main topic of this paper is concentrated on collaborative robots. Specifically preparation of their implementation in terms of safety requirements specification in the Czech Republic. Firstly, the paper is concentrated on a description of collaborative robots, their advantages and disadvantages. Then the main subject of the paper is described in the analysis of the safety requirements in relation to (…)

RESEARCH OF STABILITY OF CONTAINERS IN THE COMBINED TRAINS DURING TRANSPORTATION BY RAILROAD FERRY

Oleksij Fomin, Alyona Lovska, Vaclav Pistek, Pavel Kucera
Keywords: railroad ferry transportation | strength | dynamic load | bearing structure | Container

The article presents results of computational modelling of containers dynamic load during transportation as a part of trains of intermodal transport on a railway ferry. The computational models were developed which account the movement of the container with regard to the frame of the flat wagon while moving of the railway ferry. It was assumed that there is no movement of the flat wagon with regard to t (…)

NEWEST DEVELOPMENT IN INTERCONNECTING THE DATA CYBER GLOVE 2 AND THE ROBOTIC HAND MECHATEROBOT

Juraj Kovac, Jozef Svetlik, Vladimir Rudy
Keywords: 3D Print | interface | wrist | humanoid effector | Robotic hand

The article deals with the development of mechatronic interface for a robotic wrist Mecha Robot as well as with software interface that is compatible with the mechanical and sensory part of the Cyber Glove 2 – Mechaterobot device under development. Three variants of the designed wrist were subjected to scrutiny, of which, after careful analysis by the so-called scoring method implementing critical weigh (…)

STOCHASTIC STRENGTH ANALYSIS OF COMPRESSION HEADLESS SCREW

Vojtech Bajtek, Karel Frydrysek, Leopold Pleva
Keywords: Biomechanics | Histogram | strength | Osteosynthesis | Stochastic Analysis | Headless (Herbert) Screw

This article deals with strength and stiffness analysis of headless screw. This issue was solved in cooperation with engineering industry and doctors. The problem was solved using a stochastic approach, which utilizes the field of random events (simulations), which are applied for determination of input values. The prototype of headless (Herbert) screw Ti4.0/1.4x30/75 was used for solving this problem. (…)

LONG SPINDLE DESIGN FOR GRINDING

Lukas Rudolf, Jiri Fries, Oldrich Ucen
Keywords: spindle length | internal diameter | pipe | grinding machine | long spindle

This article is focused on design issues concerning the long spindle used to grind the internal pipe diameters. In the article an example of spindle design for an internal pipe diameter grinder can be found to process 11 m long pipes with external diameters ranging from 270 to 610 mm. Furthermore, this article offers a theoretical proposal for the spindle stroke in connection with its engagement, taking (…)

THE CREEP OF MATERIAL OBTAINED USING SLS TECHNOLOGY

Jerzy Bochnia, Slawomir Blasiak
Keywords: Rheological Model | Creep of Material | Additive Technologies

This paper discusses the results of the creep of material obtained with the use of the SLS additive technology. The author described the creep test, and a selected rheological model was adjusted to the creeping curve obtained in an experiment way. The parameter values of the rheological model were estimated. The anisotropy of the rheological properties of the material with regard to the print direction (…)

DESIGN OF TEST RIGS FOR MEASURING DYNAMIC PROPERTIES OF SOFT ACTUATORS

Monika Trojanova, Alexander Hosovsky
Keywords: Nonlinear Dynamic Characteristic | Ionic Polymer Metal Composites Actuator (IPMC) | Dielectric Elastomer Actuator (DE) | Fluid Muscle | Soft Actuators

The paper describes the process of design and construction of test rigs, whose task will be to measure dynamic characteristics (namely displacement, pressure, force). The test rigs are built for three specific types of soft drives - fluid muscle, DE actuator (dielectric elastomer) and IMPC actuator (ionic polymer metal composite). The measuring devices, which have been assembled at the authors' workplac (…)

APPLICATION OF THE CFD SOFTWARE FOR MODELING THERMAL COMFORT IN SPORT HALL

Miroslav Rimar, Andrii Kulikov, Marcel Fedak, Serhii Khovanskyi, Ivan Pavlenko
Keywords: ANSYS | natural convection | heating | HRV | cfd

The building as a single energy system represents not just a set of elements of fencing structures and engineering equipment, but a certain combination of them. The object under the study was the sports hall. During the simulation, the calculation model of energy, viscous and radiation was chosen. A comparison of thermal conditions of the premises with different heating methods confirmed that direct he (…)