Optimum Of Drawbead Design and Restraining Forces By Sensitivity Analysis Method Combined With Inverse Approach In Sheet Metal Forming Process

摘要

An improved algorithm to optimize the restraining force of equivalent drawbead was proposed base on BGFS(Broyden-Fletcher-Goldfarb-Shanno) algorithm combined with a simplified finite element method called inverse approach(IA). The forming limit curve (FLC) and the wrinkle limit curve (WLC) were considered as the objective function to reflect the influence of fracture and wrinkle defect in sheet metal forming process. The optimized result was more accurate than those procedures which only consider the variation of thickness distribution. The optimized process was also very efficient due to the simplified assumptions of the IA. Two stamping parts were presented to validate the accuracy of this optimum algorithm.