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Bahre D.,Institute of Production Engineering | Rebschlager A.,Center for Mechatronics and Automatization | Weber O.,Center for Mechatronics and Automatization | Steuer P.,Center for Mechatronics and Automatization
Procedia CIRP | Year: 2013

Pulse Electrochemical Machining (PECM) is known to produce finished surfaces with a typical roughness in the region of conventional machining methods like grinding or lapping. Furthermore, the process characteristics support the leveling of a rough anodic surface by using an either smoother, equally rough or even rougher cathode. This research focuses on an empirical investigation of the contrary approach, since for some applications surfaces with a well-defined roughness within small tolerances are needed. Examples are forms for injection molding, medical implants and friction pairs. In this contribution the copying accuracy to specifically produce and reproduce a localized as well as adjustable rough surface structure in steel is analyzed under different process conditions. The surface structure and roughness of the used PECM cathodes are initially produced by Electrical Discharge Machining (EDM) using copper as electrode. This study will show how surface roughnesses can accurately be produced with PECM in a range of typical conventional and non-conventional machining methods. Furthermore, the possibility of adding a surface texture by PECM is pointed out which will create a similar result as an EDM process but without the disadvantages of heat affected zone, tool wear and long machining time for fine finishes. The changes of the surface roughness during the process chain-producing the electrodes by turning, machining the PECM cathodes with EDM and finally machining the parts with PECM - are measured in all stages and correlated to the process conditions and influencing parameters. For all PECM experiments a commercially available PEMCenter8000 with sodium nitrate as electrolyte and for all EDM experiments a FORM20 with IonoPlus IME-MH as dielectric was used. © 2013 The Authors. Source


Krynke M.,Institute of Production Engineering | Borkowski S.,Institute of Production Engineering
Periodica Polytechnica Transportation Engineering | Year: 2014

The effect of selected bearing clearances in double row ball bearing and three row roller on their static carrying capacity is presented in the paper. An original method of determination of these profiles by means of the author's program that was based on a calculation model with rigid rings was proposed. This program allows on automated preparation of static load carrying capacity profile for the different defined values of clearance bearing. This consideration is illustrated by an example that was carried out for bearing in nominal state i.e. bearings without clearance and for acceptable value of bearings clearances that was defined by producer. Some specific points of bearing's operation and the distribution of internal load for these areas were also discussed. A mechanism of formation this load distribution on individual rolling elements of bearing was discussed. The detailed description of the course of the carrying capacity characteristics with repeated appearing of the local minimum was made. Source


Pata V.,Institute of Production Engineering | Manas M.,Institute of Production Engineering | Manas D.,Institute of Production Engineering | Stanek M.,Institute of Production Engineering | Sivtseva A.,Institute of Production Machines
17th Symposium IMEKO TC4 - Measurement of Electrical Quantities, 15th International Workshop on ADC Modelling and Testing, and 3rd Symposium IMEKO TC19 - Environmental Measurements | Year: 2010

The article describes the problem of dual shooting and evaluation of high-speed time varying phenomena using high-speed camera systems. It describes necessary steps for the preparation of shooting and how to set up the electronic shutter and also focuses on the processes of calibration and final evaluation of the high-speed phenomena. Dual shooting of high-speed phenomena is very modern while still remaining quite an unexplored field and is at present subject of a research at the Institute of Production Engineering ÚTB in Zlín. The published processes particularly for the Chip-Chunk test are brand new and at currently being patented in the Czech republic. Source


Weyrich M.,Institute of Production Engineering | Grienitz V.,Institute of Production Engineering | Adlbrecht G.,Institute of Production Engineering
21st International Conference on Production Research: Innovation in Product and Production, ICPR 2011 - Conference Proceedings | Year: 2011

Large multinational companies such as automotive OEMs are well organized in managing multiple locations around the world. Thereby they are deploying complex manufacturing networks following vendor management strategies. However, small and medium sized companies in high wage countries do have challenges in identifying the right strategy towards globalization. Especially medium sized production sites in low wage vs. high wage countries are under dispute. This paper presents on the one hand, aspects towards the benefit of a production in high wage countries. On the other hand, approaches are studied that recommend international locations and assess their impacts to SME. An analysis of SME case studies is presented that highlights the different aspects, especially with respect to their manifold stakeholder-dependencies, regional networks or economy of scale. But what are the strategies, success factors, decision criterions and key performance indicators in the site selection process? Lead interviews with entrepreneurs of companies in Germany and Asia have been conducted and evaluated. Additionally, this paper provides a detailed secondary literature review to support the cases. Source


Swat M.,Institute of Production Engineering | Brunnet H.,Institute of Production Engineering | Lyubenova N.,Institute of Production Engineering | Schmitt J.,Campus A | And 2 more authors.
Procedia CIRP | Year: 2014

Abrasive flow machining (AFM) is an abrasive machining process used to machine internal geometries like bores in terms of deburring and finishing the surface with high performance. A silicate-based medium is forced through the internal geometry of a work piece by a hydraulic cylinder. The medium contains a certain amount of abrasive particles like carbide or diamond which influence the removal rate and surface quality. For example, components of fuel injection systems are treated with the process in order to withstand higher internal pressures. One goal is the improvement of the surface quality whereas the other one is the reduction of stress concentrations at bore intersections due to the abrasive deburring and defined rounding. In this paper, an optimized process control is proposed by combining different levels of piston pressure in one machining procedure. This can be compared to roughing and finishing in conventional machining and is supposed to reduce the lead time while achieving the lowest possible surface roughness. A commonly used automotive steel AISI 4140 was used for the investigation. Additionally, a force model based on in-process measurements of axial forces will be developed. The force model focuses on the influence of the applied piston pressure on the friction conditions of the AFM medium. © 2014 Published by Elsevier B.V. Source

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