拼焊板盒形件的成形性能与焊缝移动的研究

Research on Forming and Weld-line Movement for TWB of Square Box Part

通过数值模拟技术,结合正交实验设计,研究拼焊板盒形件在不同板厚比、不同强度比、不同焊缝位置、不同压边力、不同拉深筋阻力以及不同摩擦系数的情况下的成形极限与焊缝移动。研究表明:板厚比与强度比对拼焊板盒形件的焊缝移动量影响很大,板厚差不宜过大;焊缝位置对拼焊板盒形件的焊缝移动量影响较为显著,建议将焊缝位置设计在偏向厚板一侧。在此基础上,选择合理的压边力和拉深筋阻力分布可以减小焊缝移动,从而保证拼焊板的成形质量,并在某车型门内板的实际生产中得到应用和证实。

The weld-line movement and formability of the square box part have been studied by FEM simulations and orthogonal experiments in the following conditions： different ratio of blank, different ratio of strength, different weld-line location, different BHF, different drawbead restraining force and different friction. The results show that the different ratio of blank thickness and ratio of strength ＆ weld-line location have a marked effect on the weld-line movement. In order to ensure the formability of TWB part, the ratio of blank thickness should not be too big and the weld-line location should near the thick blank. And On this basis, the movement of weld-line can be reduced by the reasonable binder force and drawbead restraining force. Therefore formability can be controlled effectively. These rules have been applied and proved in the production of some inside door part.