4Park C S, et al. Process design and blank modification in the multistage rectangular deep drawing of an extreme aspect ratio [ J ]. Materials Processing Technology, 2004,153 - 154:778 -784
5Savas V, Secgin O. A new type of deep drawing die design and experimental results [ J]. Materials & Design, 2007,28
6Min D K, Jeon B H, Kim H J. A study on process improvements of multi-stage deep-drawing by the finite-element method [ J ]. Materials Processing Technology, 1995,54:230-238
7Kim S H, Kim S H, Huh H. Tool design in a multi-stage drawing and ironing process of a rectangular cup with a large aspect ratio using finite dement analysis [J]. International Journal of Machine Tools & Manufacture, 2002,42:863 - 875
