激光拼焊板拉延成形焊缝移动优化控制

Optimized control of weld movement in the drawing process of laser tailored welded blanks

针对不同材料种类、厚度、强度、镀层焊接的拼焊板存在的成形问题,采用有限元仿真技术准确预测了拼焊板拉延成形工序的金属流动,在此基础上开展了拉深筋优化工艺研究.研究结果表明:由于纵梁前端和后端变形不均匀,拼焊板焊缝在拉延过程中随着拉深筋设置的不同产生不同的流向;当纵梁后端两侧拉延筋阻力系数分别设置为0.35和0.15时,零件内部焊缝移动量最小,更有利于拼焊板的成形质量控制.

According to the formability problems of tailor welded blanks with different material grades, thickness, strength and coatings, the metal flow and manufacturing defects are predicted based on finite element simulation meanwhile the drawbead optimization are carried out in the drawing process. It can be seen that the different drawbead design will result in different weld flow in the drawing process of tailor welded blanks because of non-uniform deformation between the front and back of longitudinal rail. When the drawbead factors in the back of longitudinal rail are separately set to 0. 35 and 0. 15, the weld movement inside the part is minimum so that the forming quality can be effectively controlled.