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차체강판 등급에 따른 S-rail 성형성 및 스프링백 특성 비교
정대근(D. G Jung),김흥규(H. K. Kim),김세호(S. H. Kim),김형종(H. J. Kim) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.5
In this study, we conducted a series of s-rail forming tests by using sheet sheets with the grades of 340, 440, 590,and 780MPa and then compared formability as well as springback behaviors in the final s-rail products. Various types of drawbeads, i.e. without-bead, locking-bead, and smooth-bead, were applied to the s-rail forming die in order to examine the effect of bead on the s-rail formability and springback. The dimensions of experimentally obtained s-rail products were measured for comparison with finite element predictions. From the comparison, we could confirm that the experimental deformation behaviors agreed well with the finite element predictions in terms of the dependence on sheet sheet grade. The quantitative data of formability and springback for different grades of sheet sheets would be very useful for developing car body parts using high strength steel sheets which are increasingly required by automakers recently.
경화식에 따른 S-rail 성형공정에서 스프링백 모드 비교
김세호(S. H. Kim),이명규(M. G. Lee),최병현(B. H. Choi),이진우(지음),김홍규(H. K. Kim) 한국소성가공학회 2012 금형가공 심포지엄 Vol.2012 No.9
Springaback modes are quantitatively compared according to the hardening model in the finite element simulation of the stamping process of an S-rail. For comparison of the hardening model, this paper selects isotropic hardening model and Yoshida-Uemori model. From the analysis result, it is noted that the angle change in the flange part is predicted more accurately with kinematic hardening model.
유한요소해석을 이용한 세장비가 큰 직사각컴 다단계 성형공정의 금형설계 - Part I. 금형설계
김세호,김승호,허훈,Kim, S.H.,Kim, S.H.,Huh, H. 한국소성가공학회 2001 소성가공 : 한국소성가공학회지 Vol.10 No.2
Tool design is introduced in a multi-stage rectangular cup drawing process with the large aspect ratio. Finite element simulation is carried out to investigate deformation mechanisms with the initial tool design. The analysis reveals that the difference of the drawing ratio and the irregular contact condition produces non-uniform metal flow to cause wrinkling and severe extension. For remedy, the modification guideline is proposed in the design of the tool and process. Analysis results confirm that the modified tool design not only improves the quality of a deep-drawn product but also reduces the possibility of failure.