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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.
정대근(D. G. Jung),김세호(S. H. Kim) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.5
Tendency of springback evolution is quantitatively evaluated the press forming of hat-type members for an automobile. Two kinds of members are fabricated with the try-out process using four kinds of steel sheets having different UTS. Effect of UTS on the springback amount are investigated with each prototype made from various steel sheet. The springback amounts in each prototype are measured and compared quantitatively.
정대근(D. G. Jung),김세호(S. H. Kim) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.10
In this paper, finite element forming analysis is performed to clarify the limitations of the accuracy in the stamping analysis with four kinds of steel sheets that have different tensile strength such as 340MPa, 440MPa, 590MPa and 780MPa. Comparisons are carried out between the analysis and the experiment from the viewpoint of springback amounts. Amounts of springback modes are extracted according to the classification scheme proposed by authors and the prediction error is calculated with the normalized root mean square error method. The analysis result shows the simulation accuracy is lowered for predicting at wall curl, ridge curl and section twist as the UTS of steel sheet increases.