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Prešov, Slovakia

Monkova K.,TU Kosice
Advanced Materials Research | Year: 2014

The contribution deals with the geometrical data definition of part with unspecified variable radius by means of modern equipment and computer aid. There are described some problems that originate at the real part digitizing. The possibility of virtual 3D model creating is given due to the modern equipment so called scanners. After the sections of scanned model were created, their contours were interpolated or approximated by curves of Bezier and Spline type. The curves were covered with a coat surface created as a Pro/Engineering system's own element, so the geometrical data were readable also for CAM system area. The virtual model serves for the generating of CL data to make new part on NC/CNC machine. The manufacturing of the part with CNC machine utilization enables to increase the production efficiency and the part quality. © (2014) Trans Tech Publications, Switzerland. Source


The article deals with surface roughness characteristics of polyamide APA after the turning by tool with linear cutting edge. The experiment was centred on the obtaining of Ra and Rz dependences on both cutting speed and feed per revolution concurrently. Polyamide APA allows the production of very large structural and semi-structural parts for automotive and non-automotive applications including interior, exterior and under-the-hood applications. It also allows reducing the total cost of production, especially for lower volume parts. Therefore, the authors deals with the possibility to work this material. The special cutting tool was selected in regard to the authoŕs previous experiments. The surfaces of investigated metal samples, which were machined by the tool with linear cutting edge, achieved very good properties, so it was the reason for the using of this tool at the experiments presented in the article. Obtained values of surface roughness characteristics were worked up by means of regression analysis and according to the rules for statistical data processing. The results are arranged into the table and consequently into the graphical presentations. The shapes of chips at the machining within various working conditions are shown at the end of the article. Next experiments will be focused on the machining of other types materials with the same unconventional cutting tool and for the obtaining new data that characterize the machined surface. © 2013 Trans Tech Publications, Switzerland. Source


Vodicka R.,TU Kosice
Engineering Analysis with Boundary Elements | Year: 2010

A comparison of two approaches for solving time dependence in an unsteady heat conduction problem with a material or other interface, based on a boundary element technique is presented. A quadrature algorithm is used in the first approach for calculating convolutional integrals, which leads directly to the time-domain solution of the problem; the other approach uses the Laplace transform and a numerical inversion of the Laplace domain solution. The new numerical techniques lead together with the Symmetric Galerkin Boundary Element Method applied for space variables and a weak formulation of interface conditions to an interface problem with generally curved interfaces and to independent meshing of each side of the interface. The discussion on numerical results is focused on the non-matching discretization of the interface. The obtained data are also compared with known analytical solutions, if available, and discussed in the cases of different material properties pertinent to substructures on both sides of the interface. © 2010 Elsevier Ltd. All rights reserved. Source


Novakova-Marcincinova L.,TU Kosice | Novak-Marcincin J.,TU Kosice
Applied Mechanics and Materials | Year: 2013

Rapid Prototyping (RP) can be defined as a group of techniques used to quickly fabricate a scale model of a part or assembly using three-dimensional Computer Aided Design (CAD) data. What is commonly considered to be the first Rapid Prototyping technique, Stereolithography was developed by 3D Systems of Valencia, CA, USA. The company was founded in 1986, and since then, a number of different Rapid Prototyping techniques have become available. In paper are presented possibilities of Rapid Prototyping application in area of intelligent optimization design. © (2013) Trans Tech Publications, Switzerland. Source


Novak-Marcincin J.,TU Kosice | Janak M.,TU Kosice
Advanced Materials Research | Year: 2014

Virtual reality provides an easy, powerful, intuitive way of human-computer interaction. The user can watch and manipulate the simulated environment in the same way we act in the real world, without any need to learn how the complicated user interface works. Therefore many applications like flight simulators, architectural walkthrough or data visualization systems were developed relatively fast. Later on, virtual reality has was applied as a teleoperating and collaborative medium, and in the entertainment area. Augmented reality system generates a complex view where the virtual areas are covered by real environment and offers the basic working place for the user. It is a reciprocal combination of the real scene observed by the camera and virtual scene generated by the computer logical core that mixture the both scenes. It is easy to say that possibilities of augmented reality find the utilization in many industrial spheres like as aeronautics, automobile industry, manufacturing etc. © (2014) Trans Tech Publications, Switzerland. Source

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