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Keywords: multi-point stretch forming, numerical simulation, hyperbolicity, amendment. Abstract. A finite element model was built for the sheet metal multi-point stretch forming (MPSF), and the numerical simulation of the MPSF for the saddle and spherical surface workpiece were performed. The simulation results show that,to hyperbolicity workpiece, the influence on precision is different in dissimilar direction, and the reason was analysed. Besides,In MPSF, the contact between sheet and punches group is discontinuous, so it is very important to structure the enveloping surface of punch group. In this paper, four boundary line method was used to describe it to obtain smooth curved face, and B-spline curve was adopted to approach curves in four boundary line method. Finally, the experiment was done to approve the validity of method.

Numerical simulation of multi-point stretch forming for hyperbolicity workpiece and it s process analysis