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Yoshida-Uemori 모델을 이용한 Al 판재의 스프링백 예측
서오석(O. S. Seo),이은국(E. G. Lee),홍석무(S. M. Hong),최선철(S. C. Choi),유수열(S. Y. Ryu),이명규(M. G. Lee),김헌영(Heon Young Kim) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
Springback is caused by the recovery of elasticity of a flat-rolled metal, which occurs when the forming force is released from a flat-rolled metal. Springback takes place in a large degree when a high strength steel plate or AI alloy sheet is processed. It has been known that hardening model is the most efficient for the prediction of springback. Recently, various researches have been carried out. In particular, Yoshida-Uemori model has been proved to be the most suitable for forecasting the springback of a high strength steel plate. In this paper, Uniaxial tension tests and cyclic loading tests(T-C-T, C-T-C) were conducted on the 1050 Al alloy sheet, 3003, and 5052 series. And based on the test results, coefficients required for Yoshida-Uemori model have been figured out. In addition, the test results were put into commercial finite element program PAM-STAMP to predict the springback of Al Alloy sheet and the outcome has been proved to be quite accurate.
서오석(O. S. Seo),김헌영(H. Y. Kim),홍석무(S. M. Hong),유수열(S. Y. Ryu),윤석진(S. J. Yoon) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
Recently, ultra high strength products can be manufactured by the hot press forming process of Boron steel in automotive and electronics industries. In order to get high strength, the hot press forming should be accompanied by quenching process inducing phase transformation. There are several types of the hot press forming processes according to the quenching method, water quenching and die quenching, etc. In the study, the process was numerically and physically simulated to compare the two types of quenching processes, and then the strength, hardness and dimensions of the products were compared with try-outs.
핫스템핑 공정시 소재의 두께 변화에 따른 냉각채널 설계
서오석(O. S. Seo),박종규(J. K. Park),이명규(M. G. Lee),김헌영(H. Y. Kim) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.10
Recently, ultra high strength products can be manufactured by the hot stamping process in automotive industry. In the hot stamping process, cooling rate of quenching process is key factor to get the high strength, which is closely related to the design of cooling system such as the diameter, the position and the arrangement of the cooling channels. In this study, the quenching process was analyzed including phase trasnformation by finite element analysis(FEA) and the developed FE procedure was applied to the optimization of new cooling channel design with different gage thickness.