叶又,汪锦成,刘亿.金属板材渐进成形工具头运动策略与成形质量分析[J].精密成形工程,2020,12(4):139-145.
YE You,WANG Jin-cheng,LIU Yi.Toolpath Strategies and Quality of Incremental Sheet Metal Forming[J].Journal of Netshape Forming Engineering,2020,12(4):139-145. |
| 金属板材渐进成形工具头运动策略与成形质量分析 |
| Toolpath Strategies and Quality of Incremental Sheet Metal Forming |
| 投稿时间：2020-06-15 修订日期：2020-07-10 |
| DOI：10.3969/j.issn.1674-6457.2020.04.017 |
| 中文关键词: 渐进成形 运动策略 几何精度 厚度减薄 |
| 英文关键词: incremental forming toolpath strategies geometry accuracy thickness reduction |
| 基金项目:国家重点研发计划（2017YFB0304400） |
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| 摘要点击次数: 2624 |
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| 中文摘要: |
| 目的 研究渐进成形不同工具头运动策略对零件质量的影响，获取最佳运动策略，从而提高渐进成形零件的成形质量。方法 选取3种典型的渐进成形工具头运动策略与改进的运动策略进行有限元仿真，比较成形后的零件质量。结果 采用不同的运动策略均出现侧壁回弹、底部鼓包和厚度减薄缺陷，其中定间隔-下压点分散层切法轨迹成形后的零件缺陷最严重，侧壁最大回弹量和底部鼓包最大高度分别为11.5 mm和3.9 mm，采用定间隔-交替运动层切法成形后的零件厚度减薄最严重，达到75.3%。改进的定弦长层切法轨迹成形件侧壁最大回弹量为9.2 mm，底部鼓包最大高度为2.7 mm，厚度减薄率为70.7%。结论 提出的定弦长层切法轨迹的成形策略能够有效避免零件底部出现压痕缺陷，获得的零件具有最好的形状精度和最小的厚度减薄率，相较于定增量-同方向进给轨迹成形，其侧壁最大偏差减小了14.8%，底部最大偏差减小了30.8%，相较于定轴向增量-交替进给轨迹成形，其厚度减薄减小了4.6%。 |
| 英文摘要: |
| The paper aims to study the effect of different toolpath strategies on quality of incremental forming parts, to obtain the optimal toolpath strategies and improve the forming quality of parts. Three typical toolpath strategies and optimized toolpath strategy were selected to have FE simulation and compare the quality of the formed parts. The results showed that springback of side wall, bottom bump and thickness reduction occurred to different toolpath strategies. The constant step depth strategy of the pressure points dispersion got the worst forming quality with a springback of 11.5 mm and a bump of 3.9 mm. The constant step depth strategy of reciprocating motion had the largest thickness reduction ratio of 75.3 %. The optimized constant chord length strategy got the maximum side wall springback of 9.2 mm, the highest bump of 2.7 mm and thickness reduction ratio of 70.7 %. The toolpath strategies proposed of the proposed constant chord length strategy can avoid indentation defect on parts bottom, and obtain good shape accuracy and the minimum thickness reduction ratio of parts. Compared with constant step depth strategy in the same direction, the maximum side wall and bottom deviation were reduced by 14.8 % and 30.8 %, respectively. Its thickness reduction is 4.6 % smaller than the constant step depth strategy of reciprocating motion. |
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