公转速度对冷滚打成形制件回弹影响研究

在冷滚打成形过程中,滚打轮对工件击打和滚压的同时,工件变形区域储存了较大的弹性应变能,导致工件成形结束后会出现回弹,回弹现象对成形工件的廓形精度有着较大的影响。本文主要针对滚打轮公转速度与回弹量之间的关系进行研究。建立了冷滚打成形回弹的有限元仿真模型,通过动态仿真分析获得了不同公转速度时成形齿槽截面在切向、轴向和径向的变形规律;通过静态分析获得了成形齿槽截面各部分在不同公转速度下切向、轴向和径向的回弹规律。结果表明,相同工艺条件下冷滚打实验得到的工件廓形与仿真结果吻合,验证了仿真结果的正确性,通过合理选择工艺参数可以有效控制回弹,提高制件成形精度。

Effect of Rotational Speed on Springback of Cold Roll-Beating Forming

During the cold roll forming process,a large elastic strain energy was stored in the deformation area when the rolling wheel hits and rolls the workpiece, resulting in emerging of springback. The springback had a great influence on the profile accuracy of workpiece. In order to control the precision of formed parts effectively, this paper studied the relation between rotational speed and springback. According to basic principle of cold roll-beating, a finite element dynamic simulation model is established. Through simulation, deformation law of the section of formed gullet in tangential direction, axial direction and radial direction under different rotational speed, and the springback law were obtained by static analysis. The results show that the workpiece profile obtained by cold roll-beating under the same process conditions is in agreement with the simulation results. The correctness of the simulation results is verified. The springback can be effectively controlled through the rational selection of process parameters, and the forming precision of the parts can be improved.