Research On The Numerical Simulation And Process Parameters Optimization Of Automobile Body Panels Forming

Automobile panels stamping process is an extremely complex elastic-plastic deformation process. The quality of forming has a lot of the influence factors, during the forming process it often appears as wrinkling, cracking, springback defects. The current research is mainly about the forming defects to eliminate or control. The traditional way to improve is using to repeatedly test and modify mould, it's not only time-consuming, and also sometimes it even causes mould scrapped. As the numerical simulation technology is applied widely, it's greatly reducing the development production cycle, cost and improving the production efficiency. CAE technology has become important component during mould design and product quality control check, so the research has important theoretical significance and application value.Based on the numerical simulation software DYNAFORM, this paper is research on the stamping process simulation about a light bus left rear car door board, including the mould surface design, blank design, drawbead layout design,and establishing a drawing finite element model, and also research on the part forming defects about wrinkling, cracking and springback to improve the forming quality. Based on the orthogonal experimental design and the response surface method, it establishes the relation between seven design variables and minimum thickness, maximum thickness, uniform deformation degree respectively, and analyses its various factors on the influence of the objective function; The seven design variables contains five sections drawbead resistance coefficient value, friction coefficient, blank-holder force.It establishes the optimization model about the objection function as minimum uniform deformation degree, the minimum thickness and maximum thickness as constraint target. Then it uses genetic algorithm for global optimization to obtain the approximate optimal solution. According to the optimized parameters, the part drawing simulation gets a good forming quality. Then it simulated the trimming pierce and springback, according to the amount of springback to take control measures to make its springback meet the requirements. At last it is the experiment demonstration, comparing the numerical simulation results with the practical stamping results, and explains the numerical simulation results reliable. It plays very good guiding role and reduces the cost and development cycles for the actual production in order to improve the competitiveness in the market.