差厚拼焊板方盒件在充液拉深过程中焊缝移动的研究

Study on Weld-line Movement of Square Cups with Tailor-welded Blanks in Hydro-forming Deep Drawing

基于Dynaform分析软件,就差厚拼焊板充液拉深盒形件的压边力、液体压力及加载方式对焊缝移动的影响进行仿真与研究。结果表明,充液拉深时,薄、厚板两侧的压边力差值大小对盒形件底部的焊缝移动影响不大,而控制预胀形所形成的等效拉深筋高度,可有效地减小底部的焊缝移动量;同时,提高充液工作压力可显著减小侧壁焊缝的移动量。这一研究结果对指导拼焊板充液拉深具有现实的意义。

Based on finite element simulation software Dynaform, the influence of process parameters such as blank holder force, liquid pressure and its loading paths on the weld-line movement in hydro-forming deep drawing of TWBs with different thickness Was simulated and investigated. The results show that, in hydro-forming deep drawing, the effect of the different holding force between thin and thick blank on the weld-line movement is not so much, while the bottom weld-line movement reduces effectiyely by controlling the hight of equivalent draw bead during pre-bulging and the weld-line movement of the side wall decreases significantly by increasing the working pressure in the die cavity. The results of this investigation have the practical significance to guide hydro-forming of TWBs.