气门镦锻模的应力分析与结构优化设计

采用刚－粘塑性有限元法模拟热变形过程，获得终锻瞬时模具工作表面的应力分布，以此为依据，用弹性有限元法分析模具强度。使用预应力结构优化设计，降低模具工作表面的应力水平，从而延长了模具的寿命。

Analysis and Design of Stigmata Upsetting Die

Upsetting, a typical hot deformation process, is simulated by using rigid-viscoplastic finite-element method, its instantaneous stress distribution over the interface between the die and workpiece being derived for the finishing upsetting stage. Based on these computations and in conjunction with elastic finite element method,die strength is then analysized. An optimization design for prestressed die inserts is adopted to decrease pressure being applied to the working surface of upsetting die,and in turn,to prolong its service life.