Abstract: Multi-point flexible forming (MPF) is an advanced processing technique for sheet metal. In the technique, the functions such as choosing forming path and sectional forming for sheet metal, which can't be realized in traditional method, can be implemented easily. Based on the ideal forming theory, the theory and method to design the optimum forming path for sheet metal in MPF is presented in this paper. The criterion to design the transient area for sectional multi point forming is suggested. The numerical method of elastic plastic large deformation FEM with static implicit scheme for MPF process is established. The optimum forming path of typical 3D-sheet product is calculated by the present method. Using the method and developed software, the MPF process of typical 3D-sheet product is numerically simulated.

Key words: multi-point forming, sheet metal forming, forming path, sectional forming, numerical simulation