Numerical simulation during multi-point forming process of sheet metal

On the theoretical basis of Hill' so-called exclusive sufficiency condition on elastic plastic materials and virtual power principle, a finite element model for multi-point forming is given. The effect during multi-point forming process is discussed by means of numerical simulation, on the aspects of thickness, material of sheet metal and elastic medium. The elastic medium with suitable parameter is found through numerical simulation. The result proves that the application of elastic medium with suitable parameter can restrain impressed mark efficiently and insure the forming precision of the part. Moreover, the experiment on the multi-point die forming of sheet metal by the MPF machine is done to validate the efficiency of the numerical simulation.