Abstract: On the basis of the inverse method of one-step forming process, a positive method was proposed to simulate the sheet metal stamping process. The spatial initial solution of the one-step forming positive method was preliminarily obtained using the mapping relationships and area coordinates. Then using Newton-Raphson method to get iterative solutions in 3-D coordinate system based on deformation theory. The contact search method was introduced in the iterative process to ensure the nodes do not separate from the part surface. The solving process of the positive method was more in line with the part forming process, it improved the simulation precision while kept the advantage of high efficiency of the inverse method. A square-box drawing experiment was performed and the positive method was validated.

Key words: material synthesis and processing technology, one step forming, deformation theory, positive method