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980MPa급 초고장력 강판의 자동차 프런트 사이드 멤버 부품 성형에 관한 연구
차승훈(C. H. Cha),이상곤(S. K. Lee),고대철(D. C. Ko),김병민(B. M. Kim) 한국소성·가공학회 2009 소성가공 : 한국소성가공학회지 Vol.18 No.1
This paper is concerned with forming technology of an automotive front side member part with ultra high strength steel sheet of DP980. The forming technology considered in this paper is the draw & form type, which installs the upper pad and lower pad to produce the complicated shape of ultra high strength steel sheet. In order to produce sound product, comparison between form type and draw & form type and between draw type and draw & form type are investigated by FE-analysis. FE-analysis is carried out with commercial sheet metal forming analysis S/W, DYNAFORM. It was shown from FE-analysis that the draw & form type satisfied the required specifications such as the dimensional accuracy and soundness of automotive front side member part. The effectiveness of the analytical result was verified by the experiment. From this investigation, the draw & form type is proved to be able to supply useful forming technology in forming ultra high strength steel.
금형 재질과 표면 처리 조건이 1.2GPa급 강판의 전단 가공에서 전단면 특성에 미치는 영향
차승훈(S. H. Cha),서판기(P. K. Seo),남재두(J. D. Nam),안민수(M. S. Ahn),원광우(K. W. Won) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.10
In order to reduce the weight and improve the crash performance of the vehicle, advanced high strength steel of DP980 and CP1180 have widely used in the automotive industry. However, the high strength steel in the press parts causes severe tool wear or failures, such as adhesion, chipping and fracture at the tool cutting area during the shearing process. These result in the excess burr which deteriorates the tool life and causes serious problem in the product quality. The objective of this study is to evaluate the effect of the characteristic of sheared surface on the die material and surface treatment conditions at the shearing process with 1.2GPa steel grade. The characteristics of sheared surface were evaluated after shearing experiment of 60,000 strokes. A burr height was measured using the illuminance meter. Also, tool wear or failures was analyzed through observing microstructure.