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

发布时间：2019-06-06 12:45

【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。
[Abstract]:There is a problem of uneven end face of a three-ball pin universal joint after warm reverse extrusion. Through the numerical simulation and analysis of the original process, considering the non-axisymmetric structure characteristics of the cup, the reverse extrusion punch has been redesigned. The height of the working belt of the side wall extrusion of the punch is different from the cone angle of the different areas of the bottom surface: the working band and the smaller cone angle of the reverse extrusion punch corresponding to the area close to the center are set up. The reverse extrusion punch corresponding to the region far from the center sets a smaller working band and a larger cone angle. The results of finite element numerical simulation show that the flatness of the end face of the cup mouth is obviously improved by using the improved punch structure to reverse extrusion of the three column slot shell, and the difference of uneven height is reduced from 3.84 mm to 2.17 mm.. According to the simulation results, it is found that the uneven height difference of the end face of the cup mouth is 2.32 mm, which is close to the simulation results. The improved reverse extrusion punch structure not only reduces the machining allowance of the three-column slot shell extrusion parts. And the utilization rate of materials is improved.
【作者单位】：烟台工程职业技术学院机械工程系;江苏威鹰机械有限公司;山东大学材料科学与工程学院;
【基金】：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
【分类号】：TG37

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