A numerical study of the effects of roller paths on dimensional precision in die-less spinning of sheet metal
A numerical study of the effects of roller paths on dimensional precision in die-less spinning of sheet metal
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DOI：
10.1631/jzus.a1300405
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发表时间：
2014-06
期刊：
影响因子：
--
通讯作者：
Yong Li;Jin Wang;Guodong Lu;Guo-jun Pan
中科院分区：
文献类型：
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作者：
Yong Li;Jin Wang;Guodong Lu;Guo-jun Pan
无模旋压消除了传统旋压对芯棒的依赖，但尺寸精度较差，需要进一步提高。本文通过有限元实验研究了无模旋压第一道次滚子路径，包括凹形、凸形、直线和组合路径，并根据弯曲程度对尺寸精度(厚度变化和形状偏差)的影响进行了研究。数值分析了滚子轨迹对厚度变化、形状偏差、刀具力以及应力应变变化的影响。结果表明，对于凹形滚子路径，厚度变化对弯曲度不是很敏感，而滚子路径弯曲度较低会导致较小的形状偏差。对于凸辊路径，较低的弯曲度导致较低的厚度减薄率和较低的形状偏差。进一步的研究表明，凸凹曲线组合轧辊路径具有较低的形状偏差，而反向组合轧辊路径具有较好的厚度精度。
Die-less spinning eliminates the dependence upon the mandrel of traditional spinning, but bringing about comparatively poor dimensional accuracy which needs to be improved. In this paper, roller paths in the first pass of die-less spinning, including concave, convex, linear and combined ones are parameterized according to the degree of bending and their effects on dimensional precision (thickness variation and shape deviation) have been studied by using experiments of finite element (FE) analysis. The effects of roller paths on thickness variation, shape deviation, tool forces, and stress and strain variations have been analyzed numerically. The results showed that for concave roller paths, the thickness variation is not very sensitive to the degree of bending, while a low degree of bending of the roller path can result in a low shape deviation. For convex roller paths, a low degree of bending leads to both low thickness reduction and low shape deviation. Further research shows that a combined roller path with convex-concave curve could contribute a low shape deviation, while an inverse combined roller path gives better thickness precision.