Modern Machinery (MM) Science Journal, June 2015

COMPARISON OF CAPABILITIES OF FINITE ELEMENT METHOD AND SPECIALIZED SOFTWARE PROGRAMS IN EVALUATION OF GEARS

VACLAVA LASOVA, PETR BERNARDIN, EVA KRONEROVA
Keywords: flank safety | root safety | finite element analysis | mesh | gear calculation

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 enginee (…)

CHEVRON CRACK PREDICTION USING THE EXTREMELY LOW STRESS TRIAXIALITY TEST

FRANTISEK SEBEK, PETR KUBIK, JINDRICH PETRUSKA
Keywords: AISI 1045 | explicit finite element method | extremely low stress triaxiality | ductile fracture | forward extrusion

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 (…)

ADAPTATION OF PRODUCTION SYSTEMS ACCORDING TO THE CONDITIONS OF AGEING POPULATION

MAREK BURES, MICHAL SIMON
Keywords: Ergonomics | work rationalisation | production planning | older workers | ageing

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 don (…)

KNOWLEDGE ACQUISITION AND CYBER SICKNESS: A COMPARISON OF VR DEVICES IN VIRTUAL TOURS

JIRI POLCAR, PETR HOREJSI
Keywords: knowledge acquisition | cyber sickness | factory layout | HMD | CAVE | visualization | Virtual Reality

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 (…)

PROPERTIES OF CUTTING INSERTS WITH DIFFERENT PVD COATINGS

IVAN MRKVICA, JANA PETRU, VOJTECH SLEHA, MIROSLAV NESLUSAN, JOZEF JURKO, ANTON PANDA
Keywords: layer durability | adhesion | nanocomposite layers | PVD and ARC methods | coating

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. Adhesi (…)

CLASSIFICATION OF COUPLED LINEAR MOTORS BY USING A DEVELOPMENT METHODOLOGY

MATTHIAS REHM, JOHANNES QUELLMALZ, HOLGER SCHLEGEL, REIMUND NEUGEBAUER
Keywords: coupled linear drive | electromechanical drives | feed axes | development methodology | design

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 mechanical (…)