PROPERTIES OF CUTTING INSERTS WITH DIFFERENT
PVD COATINGS

MM (Modern Machinery) Science Journal, June 2015

I. MRKVICA1, J. PETRU1, V. SLEHA1, M. NESLUSAN2
J. JURKO3, A. PANDA
4

1VSB-Technical University of Ostrava, Faculty of Mechanical Engineering, Department of Machining Assembly and Manufacturing Metrology, Ostrava, Czech Republic,
2Žilina University in Zilina,
Faculty of Mechanical Engineering, Department of Machining and Manufacturing Technologies, Zilina, Slovakia,
3Technical University of Kosice, Faculty of Manufacturing Technologies with seat in Presov
Department of Process Engineering, Presov, Slovakia
4Technical University of Kosice, Faculty of Manufacturing Technologies with seat in Presov
Department of Manufactury Process Operation, Presov, Slovakia

e-mail: ivan.mrkvica@vsb.cz

Abstract  

The article evaluates and compares PVD coatings. The theoretical part of the paper informs about principle of PVD coating technology and describes the arc evaporation method used for coating in greater detail. It also deals with coating materials and types and its properties. In the experimental part of the paper, the measuring and testing procedures are described and the test results are listed. Adhesion and layer durability were compared by cutting inserts with different PVD – nanostructure and nanolayer coatings. The tests were carried out by milling of carbon engineering steel 1.1191 (C45). In conclusion the testing results are evaluated on the basis of obtained information.

Keywords: coating, PVD and ARC methods, nanocomposite layers, adhesion, layer durability
 
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ADAPTATION OF PRODUCTION SYSTEMS ACCORDING TO THE CONDITIONS OF AGEING POPULATION

MM (Modern Machinery) Science Journal, June 2015

MAREK BURES, MICHAL SIMON

Regional technology institute, University of West Bohemia
Pilsen, Czech Republic

e-mail: buresm@kpv.zcu.cz

Abstract  

Not only European population but also many countries in the world are being influenced by the population ageing. Regarding to those changes the actions have to be taken in areas like pension system or health care. The paper focuses on other very important area which is working environment and conditions. Adaptations of current schemes and limits valid for production planning in these days have to be done accordingly to the needs and capacities of older workers. Older workers may experience various age-related changes i.e. increased weight, reduced flexibility, mobility and strength, deteriorating vision and hearing, possible reduction in
cognitive abilities and, in some cases, health complaints. If those facts aren’t taken in consideration and companies don’t respond appropriately they may face increased injuries and reduced productivity. However there is no ‘one-size-fits-all’ strategy so different sectors might face different challenges.

Keywords: ageing, older workers, production planning, work rationalisation, ergonomics
 
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COMPARISON OF CAPABILITIES OF FINITE ELEMENT METHOD AND SPECIALIZED SOFTWARE PROGRAMS IN EVALUATION OF GEARS

MM (Modern Machinery) Science Journal, June 2015

VACLAVA LASOVA, PETR BERNARDIN, EVA KRONEROVA

University of West Bohemia, Faculty of Mechanical Engineering,
Department of Machine Design, Pilsen, Czech Republic

e-mail: lasova@kks.zcu.cz

Abstract  

When performing the evaluation of engineering structures, today’s designers fully depend on software tools available to their employer. The choice of a software program for design calculations and evaluation of structural elements is typically dictated by its price. Where the demand for engineering design services involves simple structures, the designers turn to single-purpose programs based on engineering tables or databases, particularly in small companies. Finite element method (FEM)-based tools for structural analysis are much less affordable. Also, the time required for FEM analysis is considerably longer than with other methods. As the available design completion times tend to be short, designers typically have to rely on specialized programs (MITCalc, KISSsoft, Autodesk Inventor or PREV). Consequently, they have no other choice but to accept the information and values obtained from these calculation programs, even without understanding their principles.

Keywords: gear calculation, mesh, finite element analysis, root safety, flank safety
 
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KNOWLEDGE ACQUISITION AND CYBER SICKNESS:
A COMPARISON OF VR DEVICES IN VIRTUAL TOURS

MM (Modern Machinery) Science Journal, June 2015

JIRI POLCAR, PETR HOREJSI

University of West Bohemia, Department of Industrial Engineering and Management
Faculty of Mechanical Engineering, Pilsen, Czech Republic

e-mail: jpolcar@rti.zcu.cz

Abstract  

Virtual reality (VR) is a widely used platform for Product Lifecycle Management (PLM) support. Visualization of a virtual prototype in any phase of product or process design is important for making decisions about further development, testing and simulations. While the designers working on a particular product know its exact appearance, other personnel taking part in the development may need to use some advanced virtual reality devices, such as a Computer Aided Virtual Environment (CAVE), or a Head Mounted Display (HMD). The goal of the following study is to compare them and discuss their advantages and disadvantages while taking a tour in a reference model of a virtual plant. 45 students were exposed to a virtual model on a LCD monitor, HMD Oculus Rift, and a stereoscopic projection screen. We tested the rate of understanding the environment and possible cyber sickness symptoms.

Keywords: virtual reality, visualization, CAVE, HMD, factory layout, cyber sickness, knowledge acquisition
 
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CHEVRON CRACK PREDICTION USING THE EXTREMELY LOW STRESS TRIAXIALITY TEST

MM (Modern Machinery) Science Journal, June 2015

FRANTISEK SEBEK, PETR KUBIK, JINDRICH PETRUSKA

Brno University of Technology, Institute of Solid Mechanics Mechatronics and Biomechanics, Faculty of Mechanical Engineering
Brno, Czech Republic

e-mail: sebek@fme.vutbr.cz

Abstract  

Forward extrusion is typical way of mass-production of cold formed bars or rods with constant cross section. This process is used for production of engine alternator shafts and it is based on reducing the diameter of semi-product without removing material in several reductions. However, there is a potential danger of the chevron cracking. Chevron cracks are inside the material and therefore invisible on the surface of the semi-product. Using computational methods, the potential cracking can be predicted in advance, therefore it may lead to considerable savings. Three various phenomenological ductile fracture criteria were calibrated and then applied to forward extrusion process. As there are specific stress states in this process, new extremely low stress triaxiality fracture test were designed and used in the criteria calibration process. The test is based on the compression of the cylinder with a specific recess. Then, the criteria prediction ability and reliability is discussed.

Keywords: forward extrusion, ductile fracture, extremely low stress triaxiality, explicit finite element method, AISI 1045
 
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The following paper was presented at 16th International Conference on Mechatronics – Mechatronika 2014, Brno, Czech Republic

CLASSIFICATION OF COUPLED LINEAR MOTORS BY USING A DEVELOPMENT METHODOLOGY

MM (Modern Machinery) Science Journal, June 2015

MATTHIAS REHM, JOHANNES QUELLMALZ, HOLGER SCHLEGEL AND REIMUND NEUGEBAUER

Technische Universitaet Chemnitz, Professorship for Machine Tools and Forming Technology
Institute for Machine Tools and Production Processes
Chemnitz, Germany

e-mail: matthias.rehm@mb.tu-chemnitz.de

Abstract  

This paper presents a holistic development methodology with functional correlations between the mechanical and electrical parameters which is used for an optimization of feed drive systems with more than one drive. Within this process-oriented development methodology, the adaption of the controller is of central importance. Using the example of a new designed linear drive characterized by two mechanically coupled and opposite driving linear motors the potential of various control structures for coupled drives are going to be investigated. Next to the improvements of the drive arrangement, tuning methods for the different structures as well as experimental and simulation results are discussed.

Keywords: design, development methodology, feed axes, electromechanical drives, coupled linear drive
 
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