Abstract
Multi-gripper stretch forming (MGSF) is a new flexible forming process compared to traditional stretching forming process. Two kinds of MGSF process, back-vertical drawing (BVD) and front-vertical drawing (FVD) are compared in this study. Spherical-curved part is selected as the research object, and the finite numerical modes for BVD and FVD have been established, and the simulation results are carried out by dynamic explicit finite element analysis. The numerical results indicated that the sheet metal can get the shape of the die at a lower strain ratio and the stretch strain distribution was more uniform by the FVD, which can improve the forming quality of the formed parts. In addition, the sheet metal can be formed by FVD under smaller hydraulic cylinder strokes. The results may provide useful guidance on optimizing the MGSF equipment structure.
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