Research on Numerical Simulation for Automotive Panel Forming and Spring-back Based on Dynaform

The spring-back in automotive panel forming is one of the main problems, and the measure of controlling spring-back needs to predict the spring-back mount accurately. Taking the simulation method of the sheet stamping forming and spring-back as foundation, the simulation of stamping forming and spring-back for roof of automotive is carried out in Dynaform, and the result of simulation also is analyzed. The result shows that no crackle and wrinkle happen during the course of sheet metal forming, there are some regions sinking on the panel, other rising, and sinking tendency greater than rising. In order to control the spring-back, the inverted compensation method is adopted to optimization design die surface according the result of simulation. The rationality of spring-back controlling measure and the veracity of die surface modified are proved by the actual panel and detection result. The qualified product is obtained.