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홍석무(S. M. HONG),유수열(S. Y. Ryu),박종규(J. K. PARK),윤석진(S. J. Yoon),김기정(K. J. KIM),김헌영(H. Y. KIM) 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. In the study, the heat conductive die and the cooling channel were designed by the numerical simulation and the effect of there different parameters were determined to improve cooling characteristics.
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.