Simulation And Parameters Optimization For Robust On Stamping Process Of The Trunk Lid

As an important part of the auto-body, automobile panel, decides the automobile performance and the appearance quality, therefore enjoys high demands for its quality. However, due to the large-size of its structure and irregular and complicated shape, some defects such as tension fracture and crinkle always emerge in the process of molding.With the rapid development of computer technology, automobile panel stamping simulation with numerical simulation can predict various defects. Therefore, there is notable engineering significance and academic value to seek for a numerical simulation based optimization method for automobile panel forming process. Robust design as an effective way to improve the quality of products is becoming a more and more important method in the filed of product design especially in automobile engineering.Over 90% of the panel quality issues are due to the unreasonable design of the stamping drawing process. Stamping drawing process of the outer panel of trunk lid was studied in this paper. The finite element model was established for numerical simulation of stamping drawing with numerical simulation software ETA/DYNAFORM. The influencing factors of stamping forming on the outer panel of trunk lid were researched, such as material model, mould gap, draw bead, stamping velocity, friction coefficient and blank-holder force. The valid ranges of value were gained. The parameters optimization of the stamping drawing process of the outer panel of trunk lid is a multifactor and multiobjective problem. The robust optimal design was adopted for this characteristic. An improved response surface model based on robust design was adopted, which combines the advantages of the orthogonal experimental design and the regression analysis. Multiobjective optimization was done with the introduction of the satisfaction function. The robust optimal solution of the key factors under the influence of the noise factors is: blank-holder force 375KN and friction coefficient 0.1165. Numerical simulation was done using the robust optimal solution under the influence of the noise factors. The ranges of the maximum thinning and thickening of the thickness of sheet metal were both less than 0.01%. Therefore the robust optimal solution was verified to be reasonable, and the robust optimization method is feasible in the parameter optimization of stamping drawing process in automobile panel stamping forming.