5Li G, Jinn J T, Wu W T, et al. Recent development and applications of three-dimensional finite element modeling in bulk forming processes [J]. Journal of Materials Processing Technology, 2001,113(1/2/3):40-45.
6Jo H H,Lee S K,Ko D C,et al. A study on the optimal tool shape design in a hot forming process [J]. Journal of Materials Processing Technology, 2001,111 ( 1/2/3): 127-131.