1. Through the reduction of friction force and deformation force between the steel wire and die,the tensile failure problem of steel wire workblank during the stamping process was resolved.
   膨胀管的膨胀过程是一种高度非线性行为,解析方法虽然可以近似求出变形力的大小,但很难对膨胀过程进行全面求解。

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