Investigation of residual impact stress and its effects on the precision during milling of the thin-walled part
Investigation of residual impact stress and its effects on the precision during milling of the thin-walled part
复制标题
薄壁件铣削残余冲击应力及其对精度的影响研究
DOI：
10.1007/s00170-018-1941-x
复制
发表时间：
2018-07-01
影响因子：
3.4
通讯作者：
Ding, Zishan
中科院分区：
文献类型：
--
作者：
Jiang, Xiaohui;Zhu, Yihong;Ding, Zishan
残余应力对机加工薄壁零件的挠度有持久的影响，这也严格限制了产品的使用。研究发现薄壁零件高速切削加工时存在残余冲击应力，对薄壁零件的质量十分不利。切入和切出阶段存在明显的残余冲击应力，中间阶段存在稳定的加工残余应力。在刀具切入和切出位置，低速、大进给、大切深参数组合产生的残余冲击应力远小于其他工艺参数组合产生的残余冲击应力。多个加工表面上的残余冲击应力可以在表面上传播，形成具有相等应力能量区域的分布。通过提高线切割速度，可以在一定程度上降低表面和亚表面残余应力值。虽然切削效率提高了，但残余应力引起的挠度减少了。在此基础上，对薄壁件进行了实验验证。证据表明所提出的方法对于减少残余冲击应力是有用的；因此，薄壁件的变形也在可控范围内。
Residual stress has a lasting effect on the deflection of machined thin-walled parts, which also strictly restricts the use of products. This paper finds that there exists residual impact stress during the high-speed cutting machining of thin-walled parts, which is very unfavorable to the quality of thin-walled parts. Obvious residual impact stress exists during the cutting-in and cutting-out stages, while stable machining residual stress exists in the middle stage. At the cutting-in and cutting-out positions of tool, the residual impact stress generated by a parameter combination of low speed, large feed, and large depth of cut is much smaller than that generated by other combinations of process parameters. The residual impact stress on multiple machined surfaces can propagate on the surface to form distribution with equal stress energy areas. By increasing the linear cutting speed, the surface and subsurface residual stress values can be decreased to some extent. Although the cutting efficiency improves, the deflection caused by residual stress reduces. Based on these results, experimental verification is carried out on the thin-walled parts. And the evidence shows the presented approach is useful to reduce the residual impact stresses; therefore, distortion of thin-walled part is also within control.