The first yielidng occurs in the central zone within the die entrance,the second yielding occurs in the ring zone without the die entrance.
第一阶段的屈服是凹模入口以内圆形区域金属的屈服，第二阶段的屈服是凹模入口以外筋板以内环形区域金属板的屈服，说明凹模以外金属开始被拖动。
参考来源 - 金属板材液压胀形声发射检测 Acoustic·2,447,543篇论文数据，部分数据来源于NoteExpress
本论文对曲面凹模成形工艺的若干问题进行了系统的理论分析。
In this thesis, the basic aspects about forming process of camber die are studied etically .
最后达到了凹模结构的各个参数的优化设计，得到了预期的结果。
Finally, each optimized design parameter of the concave die structure had achieved, and obtained the anticipated result.
通过拉深工艺试验证明该曲面凹模可以达到很小的极限拉深系数。
And it is proved that it can reach smaller limit drawing ratio by the deep drawing experiments.
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