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2축 십자형 시편을 이용한 알루미늄 합금 판재의 항복곡면에 대한 연구
신효동(H. D. Shin),박진기(J. G. Park),박춘달(C. D. Park),노현철(H. C. Ro),윤국태(K. T. Youn),임희택(H. T. Lim),김영석(Y. S. Kim) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
The applications of the aluminum alloy sheets to the auto-body panels are dramatically increasing for weight reduction of the automobiles. However, low formability of the aluminum alloy sheet compare to the steel sheet can be obstacles in tool manufacturing process. Therefore, much of yield criteria for the anisotropic material such as the aluminum alloy sheet have been observed. In this study, the biaxial tensile test and FLD test for the aluminum alloy sheet are performed. The results are compared with Hill’s 1948 and Hill’s 1990 model by means of theoretical predictions. Finite element analysis also performed using the proposed method for the real panel.
980MPa급 초고강도강판을 이용한 센터 플로 사이드 멤버의 성형공정 연구
임희택(H. T. Lim),서창희(C. H. Suh),윤국태(K. T. Youn),노현철(H. C. Ro),신효동(H. D. Shin),곽영식(Y. S. Kwak),박춘달(C. D. Park) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
Ultra high strength steels(UHSS) are widely used to fill the needs of lightweight part for automobile, and the control of springback is very important factor in sheet metal forming using UHSS. In this study, to lighten the center floor side member(CFSM) which is normally manufactured using 600~800MPa steel sheet, new design of the manufacturing process for CFSM using APFC980 has been proposed. To accomplish this goal, the influence of process variables such as die corner radius and die wall angle on the springback were investigated using FE-analysis. In order to insure the validity of FE-analysis, the springback results of FE-analysis was verified with prototype product.
DP780이 적용된 자동차용 계단형 사이드실의 성형공정 연구
서창희(서평자),신효동(H. D. Shin),정윤철(Y-C. Jung),박춘달(C. D. Park),임용희(Y. H. Lim),김영석(Y. S. Kim) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
High strength steels are widely used for lightweight automobile parts and the control of springback is very important in sheet metal forming. The object of this study is to develop the forming process for stair type side sill made of high strength steel, DP780. Stair type side sill with local formed area and geometry change area can improve stiffiness and design freedom but there are a few studies for forming process. The forming technology considered in this paper is form type process, which have many advantages for forming of high strength steel compared with draw type process. Finite element analysis is carried out to predict formability and springback. It is shown that angle calibration of die is essential for reducing springback, and local forming involving bead is effective to control springback also. The effectiveness of local forming and angle calibration is verified by experimental.