锻压技术

三柱槽壳反挤压变形规律及提高反挤端面平齐度的凸模结构设计

英文标题：Deformation regulation of backward extrusion for three-column groove shell and structure design of punch for improving backward extrusion transverse plane evenness

作者：孙晓燕张太良张扣宝陈良王广春赵国群

单位：烟台工程职业技术学院江苏威鹰机械有限公司山东大学

关键词：三柱槽壳温反挤压端面平齐度凸模结构

分类号：TG316

出版年,卷(期):页码：2017,42(2):143-149

摘要：

某三球销式万向节三柱槽壳温反挤压成形后存在杯口端面不平齐的问题，通过对原工艺进行数值模拟分析，考虑其杯部非轴对称结构特点，重新设计了反挤压凸模，对凸模侧壁挤压工作带的高度与底面不同区域的锥角进行了差别设计:距离中心较近区域所对应的反挤压凸模设置较大的工作带和较小的锥角；距离中心较远的区域所对应的反挤压凸模设置较小的工作带和较大的锥角。有限元数值模拟结果表明，采用改进的凸模结构进行三柱槽壳反挤压成形，杯口端面平齐度得到了明显改善，其不平齐高度差值由原来的3.84 mm减少到2.17 mm。参照模拟结果进行生产试验，获得试样的杯口端面不平齐高度差值为2.32 mm，与模拟结果较接近，改进的反挤压凸模结构不仅减少了三柱槽壳挤压件的机加工余量，而且提高了材料利用率。

For the problem of uneven transverse plane of three-column groove shell after warm backward extrusion in the tripod universal joint, according to the numerical simulation of the original process and the special non-axisymmetric structural characteristics of the cup body, a backward extrusion punch was redesigned, and the working length of punch side wall and the cone angle at different areas of punch bottom were designed respectively. Therefore, the backward extrusion punch in the area closer to the center was set by larger die working length and smaller cone angle, while the backward extrusion in the area far from the center was set by shorter die working length and larger cone angle. The finite element numerical simulation results show that the transverse plane evenness of the three-column groove shell extruded by redesigned punch is improved obviously. The unevenness of the transverse plane reduces from 3.84 to 2.17 mm. According to production testing, the unevenness of the transverse plane of sample is 2.32 mm, and it closes to the simulation result. The redesigned backward extrusion punch can reduce the machining allowances and improve the material utilization rate.

基金项目：

2014年度江苏省重大科技成果转化专项资金项目（BA2014145）；2015年江苏省“双创团队”资助项目

孙晓燕（1982-），女，硕士，讲师

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