【摘要】 了解锥形件变薄旋压成形后的回弹规律,对提高旋压件的成形质量有重要意义.分别采用动态显式和静态隐式方法建立了锥形件变薄旋压及回弹的三维有限元模型,并研究了芯模转速和旋轮进给比对回弹前后应力、应变及壁厚变化和零件形状的影响.研究表明:随芯模转速增加和旋轮进给比减小,回弹前后最大等效应力差逐渐减小,塑性应变差及壁厚变化基本不变;回弹后最大偏离量随芯模转速和旋轮进给比增大在芯模转速较小时变化不大,而在其较大时随其增大有所减小,并随旋轮进给比增大呈先减小后增大再缓慢减小的趋势.更多还原

【Abstract】 Three-dimensional finite element models of cone spinning and successive springback were established using dynamic explicit and static implicit method, respectively. Using the models, the influencing laws were investigated, including the mandrel rotary velocity and feed rate on the change of the stress and strain, the wall thickness during springback and the final form of the part after springback. The results indicate that, for the increasing of the mandrel rotary velocity and the decreasing of the feed rate, the difference of the effective stress during springback is smaller and smaller, and the change of the plastic strain and the wall thickness during springback is not obivous. With the increasing of the mandrel rotary velocity, the departure of the part from mandrel after springback changes unobviously when the mandrel rotary velocity is low, and it decreases at the high mandrel rotary velocity. The departure of the part from mandrel after springback decreases at first, then changes little with the growing of the feed rate.更多还原