3Sven K.Esche,Sudheer Khamitkar,Gary L.Kinzel,et al.Process and die design for multi-step forming of round parts from sheet metal[J].Journal of Materials Processing Technology,1996,59:24-33.
4Seung Ho Kim,Se Ho Kim,Hoon Huh.Finite element inverse analysis for the design of intermediate dies in multi-stage deep-drawing processes with large aspect ratio[J].Journal of Materials Processing Technology,2001,113:779-785.
