锻压技术

锥形件一次成形凸模底部不破裂成形条件研究

英文标题：Research on forming condition without fracture at the bottom of punch for onestep forming of conical parts

作者：李娜1 李群1 张文文1 闫文云2

单位：（1.燕山大学机械工程学院河北秦皇岛 066004 2. 中车唐山机车车辆有限公司河北唐山 064000）

分类号：TG316.2

出版年,卷(期):页码：2018,43(5):0-0

摘要：

针对锥形件在一次成形时凸模底部容易破裂的缺陷，分析了锥形件变形特征和成形机理，定义了锥形件一次成形中，锥壁上质点靠模位移最大点为关键点，得出了锥形件一次成形至极限条件，凸模底部不破裂的计算条件，利用Dynaform软件对锥形件一次成形进行数值模拟，将计算值与模拟值进行对比，得出相对误差，分析计算条件的适用性。利用实验验证计算值的适用性，将计算值与实验值进行对比，同时给出计算条件的修正系数，其相对误差均小于22%，修正后的计算条件对于判断凸模底部不破裂更为适用。

For the fracture defects at the bottom of punch in the onestep forming of the conical parts, the forming characteristics and forming mechanism were analyzed. Then, the maximum explorator displacement location of mass poiut on the cone wall was defined as the key point, and the calculated conditions of conical parts without fracture at the bottom of punch during the onestep forming to limit condition were obtained. Moreover, the onestep forming process of conical parts was simulated by the Dynaform software. Through comparing the calculated values with simulated values, the relative errors were obtained, and the applicability of computing conditions was analyzed. The experiments were conducted to verify the applicability of calculated conditions, through comparing the calculated values with experimental values, the correction factors of calculated conditions were obtained, and the relative errors were all less than 22% after correction. Subsequently the calculated conditions after correction are more applicative for judging no fracture at the bottom of punch.

基金项目：

基金项目:河北省科技计划项目（152176315）

作者简介：李娜（1982-），女，硕士，实验师 Email：mec1@ysu.edu.cn 通讯作者：李群（1971-），女，博士，副研究员 Email：qunli@ysu.edu.cn

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