With a typical wide plate with multi-bends as the subject, in this paper the thickness variation of the simultaneous forming for the sheet metal with multi-bends have been studied through theoretical calculation analysis, computer numerical simulation as well as the physical experiments, and the pattern of metal flow in the course of forming process has been analyzed either.

According to the strain testing results,metallurgical structure of key testing points of the punching parts were analyzed and distortion of lattice were observed to study springback mechanism of multi-angle draw-bending forming.