6YEN Y C, JAIN A, ALTAN T. A finite element analysis of orthogohal machining using different tool edge geometries[ J]. Journal of Materials Processing Technology, 2004 ( 146 ) :72 -81.
7KRISTOFFER T. Finite element simulation of the tube hydro-forming process-bending performing and hydro-forming[J]. Journal of Materials Processing Technology, 2002, 3(127) :401-408.
8ULRICH T R, WOLF G B, JOHN E M, et al. Finite element modeling of the effect of non-metallic inclusions in metal forming processes [J]. Computational Materials Science, 1999(12) :32-38.
9KANAZAWA K. Tribology in cutting ability of knife [ J ]. Journal of Japanese Society of Tribologists, 2005, 50 (6) :435 -440.