杯-杆类零件精密成形过程的有限元分析

以刚塑性有限元分析模型为基础,根据参考文献1]对金属塑性变形的Mises屈服准则进行修正后,建立了新的数学模型,给出了统一的本构方程,对杯-杆类零件头部精密成形过程进行有限元数值分析.以万向节花键轴为例完成了常温条件下铅试件模拟试验,详细分析了其镦粗、复合挤压和反挤变形过程,计算出了变形体内部的速度场、应力场、应变场的分布结果和成形力随行程(时间)变化曲线,在网格重新划分时采用面积加权平均和体积加权平均相结合的算法,实现新、旧网格体系之间参数的传递,试验结果证明了数值模拟的正确性.

FEM SIMULATION ON THE ACCURATE DEFORMING PROCESS OF THE CUP-ROD TYPE PARTS

A new mathematical analysis model and a uniform constitutive equation are introduced after revising Misses yield rules based on the rigid-plastic FEM. The deformation process of the head of cup-rod type parts is simulated using rigid-plastic FEM and the lead parts simulation test is carried out under the ordinary temperature condition taking universal spline shaft as an example. The process of upsetting process, compound extrusion and reverse extrusion are analyzed in details, the distributing results of speed field, stress field and strain field within the deforming bodies are calculated and curves of moving distance and the change of deforming force are given. The connection algorithm method of area weighted average method and volume weighted average method are presented, which ensure the information correctly transferred from the old mesh system to the new one, after mesh-rezoning. The calculating data is proved to be consistent with experiment results.