Improving the drawing limits of the material is an important issue, especially when forming materials with limited formability. Heating the material up to a temperature where the yield strength decreases and formability increases drastically is one proper option to improve the drawing limit. This requires a considerable amount of energy and also might cause the material lose its character. An alternative to improve the forming limits is to heat only the flange region to a lower temperature in the warm region - decreasing the flow curve and increasing formability just enough and in the end of the process the material character is not affected or this effect can be considered negligible. In this study, a numerical basis for improving the drawing limits of one such material, DP600, is studied. For this, first, a finite element simulation for the heating up of the flange region is studied, followed by the simulation of the deep drawing process. The results of both heating simulation and the deformation are compared with the experimental studies and a good correlation has been found. It is also found that it is possible to increase the drawing limit of a DP600 steel sheet through the process of heating of the flange region.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 14074139Smooth operation of nuclear power plants is associated with periodic overhauls and maintenance. Inspection of the tubes of heat exchangers and selecting appropriate tubes for sampling is one of the most important operation of maintenance. In order to study the degradation of the tubes some of them need to be removed from the heat exchanger. Working environment where the sampling is performed is usually small and hard to access and can be also in radiologically controlled areas. The tubes can be accessed only from their inner diameter. We have developed an innovative tube sampling machine appropriate for the use in nuclear power plants heat exchangers. The working principle of the machine is based on dry electrical discharge machining. With the use of specially designed fixturing system the tube cutting can be performed on the depth of 10 meters. For the innovation we have received a golden award from the regional Chamber of commerce Posavje and a silver award from the Chamber of Commerce of Slovenia.
E.01 National awards
COBISS.SI-ID: 13907739Within the past two decades, microreactor technology has evolved from a highly advanced toy for chemical engineers to a versatile tool for chemical synthesis. MST technologies, such as photolithography and etching, are mostly used for prototyping of such microstructured devices whereas mass production is viable only through microtools utilized by micro replication technologies, such as microinjection moulding or hot embossing. In this paper, a suitable technology for tool insert for microreactor baseplate manufacturing is selected and injection moulding simulation of microreactor baseplate is performed. Mesh generation is described, two approaches of gate description in simulation software are discussed as well as mould tempering description in simulation software. Three materials were examined from the injection moulding point of view, namely polystyrene (PS), cyclic olefin copolymer (COC) and polyether ether ketone (PEEK). Finally, the microreactor baseplate was produced by injection moulding of PS.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 14538523Development of new part was focused towards determination of mechanical and formability properties of stainless sheet metal. Gained mechanical and formability data were the basis for forming analyses of a new part. The part was unsuccessful developed by the customer until the common research was started. The digital analyses and experimental work in the laboratory with the prototype tooling verified the proposed technology without part wrinkling. Currently the part is successful produced in mass production.
F.09 Development of a new technological process or technology
COBISS.SI-ID: 14222107For a company Yaskawa was made a study which deal with the new planned robot’s factory in Europe. There were made several studies for a set of different layouts of installed production resources. As a test environment was used well established tool SIEMENS Plant Simulation, in which were designed simulations for set of layouts. By analyzing and comparing the results, obtained from simulation, we propose the optimal layout of production segments and resources. Based on the study results and the excellent cooperation between Japan robot factory Yaskawa and the Faculty of Mechanical Engineering, University of Ljubljana, Japan tilted in the direction of setting up a new robot factory in Slovenia since it wants to deepen cooperation with UL FS in the future.
F.09 Development of a new technological process or technology
COBISS.SI-ID: 14557979