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1

The use of lean manufacturing techniques – SMED analysis to optimization of the production process

Sabadka D., Molnar V., Fedorko G.

Advances in Science and Technology. Research Journal

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2017

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Vol. 11, no 3

187--195

EN

Lean is a culture of real and continuous optimization. As a concept of continuous optimization in the midst of limited resources, it must be practiced continuously as a long-term organizational norm. This paper revels why changeover time reduction is important in manufacturing industries and from the various tools and techniques available within Lean manufacturing describes mainly SMED (Single Minute Exchange of Dies) for changeover time reduction and its application in Shaft manufacturing industry. This paper also describes principles, benefits, procedures and practical application of SMED. Theoretical bases are verified in a practical part that describes the analysis and design optimization of non-productive time at changeover honing machine in a selected shaft manufacturing company. The output is the structural design of universal palettes and an evaluation of productivity due to optimization of operations of time honing gear shafts. The results achieved show considerable reduction in delay arising out of machine setting time, batch-setting time and demonstration delay.

2

Possibilities of more efficient use of simulation tools in enterprise logistics

Hegedüš M., Fedorko G., Beluško M., Hlatká M., Fábera P., Neradilová H.

Advances in Science and Technology. Research Journal

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2017

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Vol. 11, no 4

189--197

EN

Computer simulation, as a powerful scientific and engineering tool, is increasingly used to solve a wide range of issues within the enterprise logistics processes. This trend is mainly due to the fact that the computer simulation method offers a whole range of benefits for enterprise logistics e.g. saving time, space and finance. The use of computer simulation in logistics, however, still has certain limitations that handicap it and do not allow it to be more operationally exploited. The main reason is that the creation of models of different logistics processes is exacting on the skills and knowledge in this area. The factors as the difficulty of creating new and modifying existing models or repeating simulation experiments complicate the more frequent application of computer simulation models in logistics. For this reason, it is necessary to look for a way to simplify and make the issue available to a larger circle of users.

3

Optimization of production processes using the Yamazumi method

Sabadka D., Molnár V., Fedorko G., Jachowicz T.

Advances in Science and Technology. Research Journal

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2017

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Vol. 11, no 4

175--182

EN

Manufacturing companies are now placing great emphasis on competitiveness and looking for ways to utilise their resources more efficiently. This paper presents optimum efficiency improvement of the automotive transmission assembly production line by using line balancing. 3 assembly stations were selected to optimize where waste management requirements are not met for achieving the production capacity. Several measures were proposed on the assembly lines concerned to reduce operations by using eliminating unnecessary activities of the assembly processes, reducing the cycle time, and balancing manpower workload using line balancing through Yamazumi chart and Takt time. The results of the proposed measures were compared with the current situation in terms of increasing the efficiency of the production line.

4

Design of a calculation fem model of the test static set-up of pipe conveyor for analysis of contact forces

Fedorko G., Molnár V.

Advances in Science and Technology. Research Journal

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2017

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Vol. 11, no 2

220--225

EN

Experimental research in the field of pipe conveyors is a difficult matter and yet necessary in order to answer the questions regarding the motion resistances and contact resistances of pipe conveyors, loading of the conveyor belts etc. These research activities can be performed not only during the actual operation of pipe conveyors, but also by means of the special laboratory test set-ups combined with the application of the computational simulation models. The main task of this paper is to assess the creation of a suitable simulation model of the test set-up for a specified pipe conveyor developed with regard to realisation of the FEM analyses, using the software product Abaqus, as well as presentation of its application possibilities.

5

The use of industrial metrotomography in the field of maintenance and reliability of rubber-textile conveyor belts in closed continuous transport systems

Fedorko G., Molnár V., Dovica M., Husáková N., Král' jr. J., Ferdynus M.

Eksploatacja i Niezawodność

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2016

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Vol. 18, no. 4

539--543

EN

Closed transport systems have been widely implemented in various areas of bulk solid handling because of their advantages. The unique character of these systems stems from the fact that transported material is fully enclosed by a conveyor belt. To ensure their operational reliability and efficient maintenance during operation, processes occurring inside the belt must be monitored. Early damage identification is very important, if not crucial, for reliable functioning of transport systems. One way to do this is by applying the industrial metrotomography method. The paper presents the research methodology of conveyor belt damage using computer metrotomography. It reports the experimental results for two samples: one with a damaged belt matrix and the other with cracks in the upper surface layer of rubber. The damage in the form of puncture of the transporting belt is also described in the paper.

PL

Z powodu swych zalet, systemy transportowe zamknięte, zostały szeroko wprowadzone i zastosowane w różnych dziedzinach transportu materiałów sypkich. Wynika to z unikalnych cech tych systemów, gdzie transportowany materiał jest w pełni otoczony taśmą. Aby zagwarantować niezawodność operacyjną i skuteczną konserwację w trakcie eksploatacji, procesy zachodzące wewnątrz taśmy przenośnikowej muszą być monitorowane. Identyfikacja uszkodzeń we wczesnym stadium, jest bardzo ważna, jeśli nie rozstrzygająca, dla przyszłego niezawodnego funkcjonowania systemu transportowego. Jednym ze sposobów identyfikacji uszkodzeń, jest zastosowanie metody metro-tomografii przemysłowej. W pracy przedstawiono metodykę badań uszkodzeń taśm przenośnikowych tkaninowo- gumowych z wykorzystaniem metro-tomografii. Zaprezentowano wyniki badań doświadczalnych dwóch próbek, gdzie zniszczeniu uległa osnowa taśmy oraz kolejnej, gdzie zaobserwowano pęknięcia w warstwie wierzchniej gumy. Zostało również opisane zniszczenie w postaci przebicia pasa transportowego.

6

Application of software simulation as a supporting tool for reducing of traffic congestions

Fedorko G., Neradilová H.

Archiwum Motoryzacji

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2015

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Vol. 68, no. 2

39--48

EN

Question of traffic congestions analysed within the framework of a city logistics is such problem, which is caused due to various factors. There are applied different methodological approaches in order to eliminate the traffic congestions. These methods are distinguished each other with regard to their complexity and applied tools. Among these tools just the software simulation plays an irreplaceable role. The software simulation method is an efficient decision-making tool, which is suitable for solving of the traffic problems during the individual solution phases. There will be presented in the following paper application possibilities of the software simulation methods that are specified for solving of the traffic congestions.

7

Analysis model for determination of contact loads between tube-shaped conveyor belt of a pipe conveyor and carrier rolls

Marasova D., Fedorko G., Kubin K., Molnar V., Husakova N.

Cuprum : czasopismo naukowo-techniczne górnictwa rud

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2010

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nr 3

71-76

EN

The article deals with the design of analysis model for determination of the magnitude of the contact loads which are induced by the interaction of the pair of tube-shaped conveyor belt - carrier rolls. The finite element method /FEA/ was used by the creation of analysis model. Analysis model was created in a program Simulia - Abaqus. Obtained results will be the basis of research which is focused on the search of tube conveyor belt dynamic wear creation.

PL

Artykuł przedstawia projekt modelu analitycznego do określania wielkości obciążeń stycznych, które powstają przez wzajemne oddziaływanie rurowej taśmy przenośnika i krążników nośnych. Do budowy modelu analitycznego użyto Metody elementów skończonych. Model analityczny zbudowano w programie Simulia - Abaqus. Uzyskane wyniki będą podstawą badań mających na celu analizę powstawania dynamicznego zużycia rurowej taśmy przenośnikowej.