Abstract: It is the main purpose to acquire the method of predicting the plastic deformation of cold stamping standard elliptical heads. As the formulas are derived, the physical meaning of the two plastic deformation prediction methods, one is used in home and the other one is used in abroad, is realized. A finite element model of the head cold stamping process is developed and validated by comparing the simulation and the experimental results. Thus, heads with different nominal diameter Dn and nominal thickness δn have been simulated and a plastic deformation prediction method of heads is proposed. The calculation results of two prediction methods are compared with those calculated by the new prediction method. The results of the two existing prediction methods reflect the average plastic deformation of heads in warp and loop direction respectively, but not the real one. However, the new prediction method is built, which can be used effectively to predict the plastic deformation of heads, is more accurate and reliable.

Key words: austenitic stainless steel, cold stamping, plastic deformation, standard elliptical head