不规则拉延件变形的研究

An Analogical Research into the Deformation Mechanism in Deep Drawing of Irregular Cups

本文通过构造一有势流场,利用模拟原理确定了不规则拉延件的毛料及其适用圆料的条件,凸缘变形区的流线及滑移线;通过引入流带的概念,分析了拉应力沿模口分布、拉延力及拉延系数,并对零件拉延极限作了近似预测。实验结果表明:毛料、特别是流线与实际情况具有良好的一致性,其他结果也有一定的参考价值。

Through the establishment of a potential flow field and the analogy theory, the blank contour,the criterion of using circular blank for irregular cups. the flow lines and slip lines are ascertained. By the introduction of an idea about flow band. the distribution of tensile stress along the irregular die throat. and hence the drawing force and draw ratio are analyzed and evaluated,and the approximate limiting draw ratio determined. The blank contour. especially the flow lines, result in. good conformity with the experiments. other results also give a fairly good reference to the farther investigation of this subject.