锻压技术

基于金属板料单点数控渐进成形方法的无底面鼓包优化轨迹

英文标题：Optimized trajectory without undersurface bump based on single-point NC incremental forming method of sheet metal

作者：吴坚曾旭成吴瀚宇

分类号：TG386

出版年,卷(期):页码：2022,47(9):90-98

摘要：

为研究提高平底类零件数控渐进成形的成形精度、表面质量和成形效率的最优路径，以圆台模型为研究对象，采用了4种成形路径进行对比试验，分别为等高线路径、每层从内到外路径、等高线+底面从内到外路径和等高线+底面多层从内到外路径，并对底面多层路径的最底层设置了3种不同的步距。结果表明：等高线+底面从内到外路径造成零件底面出现锥面下沉的现象；每层从内到外路径与等高线+底面多层从内到外路径既能消除底面鼓包，又能避免底面下沉的现象。底面多层路径的最底层步距设为0.2 mm 时，零件底面最大误差为0.16 mm。以底面多层从内到外路径代替每层从内到外路径可使成形时间显著缩短。减小底面多层路径最底层的步距，既能提高零件底面的表面质量，又能提高零件的几何精度。

In order to study the best path in NC incremental forming of flat-bottomed parts to improve forming accuracy, surface quality and forming efficiency. Therefore, for the circular truncated cone model, four kinds of forming paths were used for comparative experiments, which were contour line path, path of each layer from inside to outside, path of contour line+bottom from inside to outside and path of contour line+multi-layer bottom from inside to outside, and three different step distances were set on the bottom layer for the path of multi-layer bottom. The results show that the path of contour line+bottom from inside to outside causes the conical surface to sink on the bottom of part, while the path of each layer from inside to outside and the path of contour line+multi-layer bottom from inside to outside can not only eliminate the bulging on the bottom, but also avoid sinking phenomenon on the bottom. When the step distance of the bottom layer for the path of multi-layer bottom is set to 0.2 mm, the maximum error of the part bottom is 0.16 mm, and replacing the path of each layer from inside to outside with the path of multi-layer bottom from inside to outside can significantly shorten the forming time. Reducing the step distance of the bottom layer for the path of multi-layer bottom can not only improve the surface quality of the part bottom, but also improve the geometric accuracy of the part.

基金项目：

国家重点研发计划(2017YFD0401304-3)

吴坚（1965-），男，硕士，教授 E-mail：wujian@zust.edu.cn

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