STRENGTH ANALYSIS OF PIN CONNECTIONS USING COMPUTER AIDED SYSTEMS

MM (Modern Machinery) Science Journal, March 2017
DOI: 10.17973/MMSJ.2017_03_2016103
PETR BERNARDIN, VACLAVA LASOVA, FRANTISEK SEDLACEK
University of West Bohemia in Pilsen, RTI – Regional Technological Institute, Pilsen, Czech Republic
e-mail: berny@kks.zcu.cz
Abstract
The aim of this work was to analyse the options for predicting pin connections, using modern computer aided systems. These advanced methods include Special-Purpose Programs and Finite Element Analysis, which fundamentally differ in their duration and precision of results. Some of these methods allow calculation including the influence of the force and pin position, position of the stiffness centre, and stiffness of the connected parts. These conditions significantly affect the results. The evaluation of results is different in all the calculation methods. The resulting evaluation in Finite Element Analysis is a task for the designer, as well as the calculation using some Special-Purpose Programs (for example BSPOJ). Other Special-Purpose Programs (for example KISSsoft or MITCalc) evaluate the pin connection automatically. This work describes the comparison of these prediction methods for pin connections, and the evaluation of the results.
Keywords: pin, connection, finite element analysis, strength check, permissible stress
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EXPERIMENTAL EVALUATION OF THE QUALITY OF SURFACE AFTER WEDM FOR STEEL X210CR12

MM (Modern Machinery) Science Journal, March 2017
DOI: 10.17973/MMSJ.2017_03_2016108
KATERINA MOURALOVA, JIRI KOVAR, MILAN KALIVODA, MILAN DVORAK
Brno University of Technology, Faculty of Mechanical Engineering, Brno, Czech Republic
e-mail: mouralova@fme.vutbr.cz
Abstract
Wire electrical discharge machining (WEDM) is a non-conventional machining technology which uses electrical impulses between two electrodes to cut materials. The long-term trend of increasing accuracy and surface finish quality leads to the necessity of its detailed examination. The study deals with the evaluation of the surface morphology by electron microscopy (SEM) and chemical composition analysis (EDX). Object of interest was to assess the amount of adhering material from brass wire electrodes. Furthermore, it also examined surface and profile parameters of the machined surface. Samples for the experiment were made of X210Cr12, tool alloy steel for cold working, which was subject to 4 different types of heat treatment. Dependence between the amount of adherent material from the wire electrode and the the of machined material has been found.
Keywords: WEDM, electrical discharge machining, steel X210Cr12, quality of surface, analysis of the chemical composition
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MUNICIPAL SOLID WASTE GASIFICATION WITHIN WASTE-TO-ENERGY PROCESSING

MM (Modern Machinery) Science Journal, March 2017
DOI: 10.17973/MMSJ.2017_03_2016137
MAREK BALAS, MARTIN LISY, PETR KRACIK, JIRI POSPISIL
Brno University of Technology, Faculty of Mechanical Engineering, Energy Institute, Brno, Czech Republic
e-mail: marek.balas@vutbr.cz
Abstract
This paper discusses theoretical assets and liabilities of a use of advanced thermal technologies within waste-to-energy (WTE) processing. Gasification and pyrolysis are compared to conventional incineration. Major part of the paper deals with results of gasification experiments: various wastes were gasified within a fluid generator with a circulating fluidized bed. The results were later compared. Lower heating value, composition of the syngas and amount of tar within the syngas were the important observed factors. Experiments were performed at a Biofluid, the pilot facility at the Faculty of Mechanical Engineering in Brno.
Keywords: municipal solid waste, gasification, pyrolysis, waste-to-energy
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THE POSSIBILITY OF USING RECYCLED POLYPROPYLENE SUPOL HT345E

MM (Modern Machinery) Science Journal, March 2017
DOI: 10.17973/MMSJ.2017_03_2016141
LUDOVIT KOLLATH2, JANA KRCOVA1, ERNEST GONDAR1
1 STU in Bratislava, Faculty of Mechanical Engineering, Department of Technology and Materials,
Bratislava, Slovak Republic
2 STU in Bratislava, Faculty of Mechanical Engineering, Department of manufacturing systems, environmental technology and quality management,
Bratislava,Slovak Republic

e-mail : ludovit.kollath@stuba.sk
Abstract
Exploitation of plastic waste is current issue in part of recycling in this present. Current recycling appears possibility of manufacturing of composite materials WPC (woodplastic composite). While a few decades ago as a plastic matrix used thermosets, currently often is using thermoplastics. The reason among other things is also able recycling these composite materials. The most common example exploitation of plastics is currently PVC, PE and PP. Application of construction thermoplastics (PA, POM, PET) is limited with increased processing temperature, at which there is a degradation of lignin in the wood. The problem of exploitation of thermoplasts in comparison with thermosets is high viscosity of thermoplastic melt and decrease of wettability whit wood sawdust. For this reason is increasing of attention for determine of maximum quantity of filler wooden components.
Keywords: extruder, polypropylene, wood sawdust, particles
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SUBSTITUTION OF CEMENT BY MICRO-MILLED RECYCLED CONCRETE IN COLD RECYCLED ASPHALT MIXES

MM (Modern Machinery) Science Journal, March 2017
DOI: 10.17973/MMSJ.2017_03_2016151
ZUZANA CIZKOVA, JAN VALENTIN
CTU in Prague, Faculty of Civil Engineering, Department of Road Structures, Prague, Czech Republic
e-mail: zuzana.cizkova@fsv.cvut.cz
Abstract
Besides the bituminous binder (foamed bitumen or bituminous emulsion) cement is often added into the cold recycled mixes as well. That is because cement improves moisture susceptibility and provides sufficient strength and stiffness especially during the early stage of mix curing. This article is focused on investigation of the potential of cement substitution by the micro-milled recycled concrete. The waste concrete is simply milled by a high speed mill which causes its mechanical activation. The results of performed measurements show a very positive influence of the micro-milled concrete on moisture susceptibility in the first place. The impact on the strength and stiffness is lower than the influence of cement, however all tested mixes met the requirements for cold recycled mixes with a huge reserve. Besides that, thanks to a slower initial strength increase, the problem with hydraulic cracks origin typical for mixes with cement is eliminated.
Keywords: micro-milled concrete, recycled concrete, mechanical activation, active filler, cold recycled asphalt pavement, moisture susceptibility, cement
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METHOD OF DETERMINATION OF THE BOUNDARY STRENGTH OF PRESSED SHEETS OF CAR BODIES FOR CATEGORIES TO 1300 CM3

MM (Modern Machinery) Science Journal, March 2017
DOI: 10.17973/MMSJ.2017_03_2016154
VILIAM CACKO, IVETA ONDEROVA, LUBOMIR SOOS, JURAJ ONDRUSKA, GREGOR IZRAEL
Slovak Technical University in Bratislava, Faculty of mechanical engineering,
Institute of Manufacturing Systems, Environmental Technology and Quality Management, Bratislava, Slovak Republic

e-mail : viliam.cacko@stuba.sk
Abstract
Pressed steel sheets, in this case compacted vehicle bodies represent the structure diversity of the non-homogeneous material. There is necessity to determine the shear strength for the development of the construction of new processing equipment (cutting) of steel sheets. To calculate the shear strength it is necessary to know the ultimate firmness of the material. For homogeneous materials this parameter is normally available in the tables. The article discusses the experimental detection of boundary strength of pressed metal of vehicle bodies. To gain some relevant statistical evaluation the samples of the car body have been divided into three groups according to the engine capacity. The experiment was evaluated by the following statistical methods, analysis of variance using the AIC criterion and Grubbs test for outliers. According to the analysis of the measured parameters the resulting mathematical model, which is used for determination of optimal values of boundary strength, has been established. The resulting mathematical model can be used to determine the boundary strength, which serves as an input parameter for the calculation of shear strength required for the development of new equipment designed for the processing of scrap metal, with cutting.
Keywords: boundary strength, car bodies, steel, Grubbs test, non-homogenous material
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