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최홍석(Hongseok Choi),김병민(Byungmin Kim),강충길(Chunggil Kang),하세윤(Seyun Ha),이동휘(Donghui Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Automotive companies are pursuing to use the ultra advanced high strength steels(UAHSS) for improving fuel efficiency and crashworthiness in body panels and structures. Hot stamping process using martensitic phase transformation of austenized blank has been developed to obtain the strength above 1.5GPa with high dimensional accuracy and formability. In this study, the optimization of blank shape for hot stamping has been performed to reduce trial-and error method in development the center pillar of the automotive structural panel. In order to optimize blank shape which is one of the most important factors in hot stamping process, inverse analysis was performed to obtain initial blank shape for center pillar by the conventional stamping code, J-Stamp.Optimal blank shape has been determined by thermo-mechanical simulation considered to friction, holding force and tool shape using compensation the error between deformed path and target contour. furthermore, wrinkle at bottom region of center pillar, assembled with sill side, were significantly reduced by applying optimized drawbead. In this study, it can be established that blank optimization method for hot stamping of center pillar, an automotive structural part, in order to reduce shape error, wrinkle and fracture.