Abstract: In order to evaluate inertial effect on sheet deformation in the simulation of stamping processes by dynamic explicit FEM, an analytic model is established for analyzing binder wrap stage with curved binder surface, in which the geometric constraints of the tools on the sheet are insufficient. The min factors governing the exfent of inertial effect on sheet deformation pattern are investigated by energy method, and the approach to chose reasonable tool speed for dynamic analysis of stamping processes is proposed. The results of analytic model are verified by those of numerical simulations.

Key words: Binder wrap stage, Dynamic explicit FEM, Inertial effect, Stamping processes