点焊残余应力对汽车门框拉弯回弹稳定性的影响

为提高汽车门框的生产精度, 利用ANSYS有限元模拟软件, 经材料参数的确定、单元类型选择、几何建模等步骤, 分析了点焊热残余应力的形成、门框型材拉弯成型及回弹过程. 通过对比有、无焊点失效时的回弹量得出拉弯过程中应力较大处的焊点失效对回弹稳定性的影响较大, 反之则影响较小等结论, 并据此提出了相应的解决措施. 相关研究对提高汽车门框生产质量有着重要意义

Influence of spot welding residual stress on stability of automobile frame bending springback

In this paper, the material parameters, element type selection, geometric modeling steps are determined using ANSYS finite element simulation software, and the thermal residual stress formation of spot welding, stretch bending and springback processes of doorframe profile are analyzed for improving the production accuracy. In the end, the results from using springback with and without failure welding are obtained and analyzed. It is found that: failure solder joint at place of great stress has a stronger influence on the stability of the springback in the process of stretch bending, and otherwise less influence is exerted. In addition, other corresponding solutions are proposed, which play a significance role for improving the quality of automobile frame production