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고장력강판(DP980) 적용 자동차 roof frame 제작 금형 개발을 위한 성형 해석
손종윤(J. Y. Son),백경윤(K. Y. Baeck),이은미(E. M. Lee),노경보(K. B. No),심도식(D. S. Shim) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.10
Advanced high strength steels are widely used for lightweight automobile parts. With advanced high strength steels, automobile parts are formed thinner and lighter than normal steels keeping structural strength. However, the advanced high strength steel causes serious problems in forming process, such as springback and low formability. In this study, forming simulation for the automobile roof frame, applied advanced high strength steel (DP980), is conducted by using the commercial code PAM-STAMP, based on Finite Element Method (FEM). Results of the simulation are quantitatively analyzed, and shape deviations caused by springback phenomenon are mainly observed. To reduce the deviation, restriking and bending processes are added after drawing process. Through the FE simulations, it is found that the newly designed forming process is more effective to improve the shape accuracy.