Process parameters optimization for shell nosing of thick wall and deep hole cylindrical cup based on numerical simulation

摘要

Shell nosing is the key process to hot stamping of thick wall and deep hole cylindrical cup, the deformation of billet is great maldistribution and poor stability. The billet is under tensile stress what is bad for deformation, so tensile instability is easy occur on the wall and thinning out is easy occur at the bottom of the billet. The influence law of die-entrance taper of die, motion velocity of die and lubrication condition of die and punch on the deformation condition of shell nosing is analysised based on finite element simulation software AFDEX in this paper. The results show that when die-entrance taper of die is 15°-20°, the deformation of billet is homogeneous and the wall of billet bears the minimum tensile stress,so the deformation load is low; the deformation load increases with the friction between die and billet significantly, the friction between punch and billet has little influence to the deformation load; the deformation load increases with the motion velocity of die.