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정석환(S. H. Chung),이민철(M. C. Lee),이장호(J. H. Lee),전만수(M. S. Joun) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.10
In this paper, an approach of applying the steady state analysis technique for extrusion process is presented. With complicated shape extrusion process such as a pot-hole extrusion, the finite element analysis needs numerous remeshings, where it is not possible to simulate the process to the end for the severe case. Therefore, a steady state approach normally developed for rolling process is necessary not only for saving computation time but also for overcoming remeshing problem. Since the shape of extruded product is much more complicated than of rolled product in general, tetrahedral mesh systems instead of hexahedron mesh systems were used for the finite element analysis and the streamline tracing scheme was combined with remeshing scheme during iterations for finding steady state. The result of steady state analysis for the simply shaped extrusion process with cylindrical and square crow section was compared with that of traditional non-steady state simulation.
정석환(S. H. Chung),정완진(W. J. Chung),전만수(M. S. Joun) 한국소성가공학회 2016 한국소성가공학회 학술대회 논문집 Vol.2016 No.4
In this paper, elastoplastic finite element analysis of a bevel gear cold forging process is conducted with emphasis on elastic deformation of dies to reveal on the importance of precision forging simulation for net-shape forging. Springback analysis is also carried out to predict final shape of forging with high accuracy. The predictions obtained with elastic deformation of dies considered are compared with those obtained.