October 2012

LASER BEAM INTERACTION WITH MATERIAL SURFACE

MM (Modern Machinery) Science Journal, October 2012
Jaroslav Rasa, Radka Bicistova
Czech Technical University in Prague, Faculty of Mechanical Engineering, Research Center of Manufacturing Technology, Prague, Czech Republic
Abstract

The article describes the interaction of a laser beam with material surface, based on the oscillation of atoms in the crystal lattice, supposing that the oscillation amplitude is proportional to the temperature of the material. The principle of material removal using a laser beam is presented, along with its mathematical expression. The article also introduces a theory of laser beam interaction with material which is based on the principle of changing internal energy of the lattice. The research has been carried out for machining of pure substances using a diode-pumped, solid-state Nd:YAG laser with a mean power of 50 W.

Keywords: Laser, crystal lattice, atomic oscillation, material temperature, internal energy of crystal lattice
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LEAD TIME REDUCTION METHODS

MM (Modern Machinery) Science Journal, October 2012
Ivana Simeonovova, Simeon Simeonov
Institute of Production Machines, Systems and Robotics, Faculty of Mechanical Engineering, Brno University of Technology
Abstract

This paper describes methods for reducing the lead time in manufacturing systems. In general, there are many methods for reduction of lead time, various methods are described in this article. For many manufacturing enterprises is shortening the lead time the difference between being part of the market and be in the first place in the production and sales of a specific product. It follows that this methodology can provide the company a competitive advantage in the form of the primacy of the market and what is equally important, the customers can see that company as a firm leader in the market. It is therefore also in the article an example of the reduction of lead time in the production of the company. The result of this process is the recommendation for the managers of the company, which includes the specific changes that reduce the lead time for production and subsequently increase the production rate.

Keywords: Production rate, lead time, manufacturing system, WIP, flow time
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THE MORPHOLOGY CHANGE OF IRON DIBORIDE IN THE Fe-B ALLOY DURING DEFORMATION

MM (Modern Machinery) Science Journal, October 2012
Rostislav Choteborsky 1, Marie Kolarikova, Barbora Bryksi Stunova 3
1CULS, Faculty of Engineering, Dept. of Material Science and Manufacturing Technology, Prague, Czech Republic
2 CTU in Prague, Faculty of Mechanical Engineering, Dept. of Manufacturing Technology, Prague, Czech Republic
Abstract

This research work studies the effect of deformation and destabilization heat treatment on morphology of the iron diborides of Fe-B cast alloy. The results show, that iron diborides change the morphology from continuous network to discontinuous, if the deformation is used. Relatively homogenous distribution of iron diborides is achieved, if the deformation is combined with destabilisation heat treatment at elevated temperatures. Obtained results show that Fe-B alloys can be advantageously used as a substitute material for Fe-Cr-C cast iron in wear applications due to their better toughness.

Keywords: Iron Diboride, Metal Matrix Composite, Microstructure, Hardness
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FACILITY MANAGEMENT AS INNOVATIVE TOOL FOR EFFECTIVE MANAGEMENT OF SUPPORTING COMPANY ACTIVITIES

MM (Modern Machinery) Science Journal, October 2012
Peter Poor, Nikol Kuchtova, Edvard Leeder, Martin Januska
Department of Industrial Engineering and Management, University of West Bohemia, Univerzitni 8, 306 14 Pilsen, Czech Rep.
Department of Business Administration and Management, University of West Bohemia, Husova 11, 306 14 Pilsen, Czech Rep.
Abstract

In general, all organizations, whether public or private, use buildings, properties and services (support services) in order to support its core activities. By coordination of these assets and services; use of management skills and incorporation of various changes inenvironment; facility management (FM) affects its ability to act proactively and ensure all its requirements. The aim of FM is to strengthen (in terms of main production flow) boundary processes and systems, to allow workers (with their help) give better performance and contribute to overall success of business organization. Presented article deals with implementation and use of CAFM software ProFM, which has in result, simplification and streamlining of building management. It subsequently summarizes the advantages of using FM in organization.

Keywords: facility management, ProFM, building, efficiency, administration
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