锥形件一次成形不起皱条件下的质点径向位移

Radial displacement of mass point without wrinkle for one-step forming conical part

针对锥形件在一次成形过程中易出现起皱缺陷,分析了锥形件的成形特征,给出锥形件的成形机理,定义一次成形中锥壁上质点靠模位移最大点为不起皱关键点,并依据材料性能和几何条件,给出了锥形件一次成形极限不起皱关键点径向位移的计算条件。利用网格应变测试仪,分别对3种材料进行锥形件成形实验分析验证,得出锥形件一次成形不起皱条件下不同相对锥顶直径的径向位移实验值,并与计算条件得出的理论计算值进行对比分析,计算两者的误差,初步判定计算条件的适用性。给出计算条件的修正值和修正后的计算值与实验值的误差,最终获得计算条件的修正结果和适用范围。

Since wrinkling is the main defect during the one-step forming process of conical part,the forming characteristics of conical parts were analyzed,and the corresponding forming mechanism was discussed. Meanwhile,the maximum displacement points of mass on the cone wall were defined as the key point without wrinkling. In consideration of material properties and geometric conditions,the calculated conditions of the radial displacement for the key point without wrinkle during the one-step forming limit of conical part were obtained.Then,the conical parts forming experiments based on three materials were verified by the grid strain tester,and experiments values of different relative cone top diameter were given. Compared the calculated values with experimental values,the errors were calculated,and the applicability was preliminary determined. Finally,the revised values and the revised error were put forward,and the final results and range of application were carried out.