Research on springback of Tailor Welded Blanks with different thickness and surface compensation based on numerical simulation

Aimed at the problems of crack, wrinkle and springback caused by base metal different forming property of Tailor-Welded Blanks (TWBs) on two sides of welding line, the bending springback research on TWBs with different thickness which have transverse weld is carried out by the methods of combining numerical simulation with experiments. Based on optimized forming technology, the method of split blank holder is proposed to form the TWBs components. On the basis of the result of springback calculations, the die surface compensation is carried applying the springback compensation module (SCP/Compensation) in the FEM numerical simulation analysis software of DYNAFORM. The simulation results indicate that applying the die after two times of compensation to finish the bending process, the component surface after springback is identical with that of standard component, and the influences of springback on component forming can be eliminated basically. The experiment of U-shaped part forming is done to confirm the accuracy of the finite element numerical simulation results.