Blank Design Of The Trunk Lid And Drawing Process Optimization

The drawing process of sheet metal and its numerical simulation is a very active research field, which has enormous economic benefits. With the development of FEM (Finite Element Method) and computer technology, the numerical simulation has become an effective tool in process analysis and optimization. There are many factors that influence the drawing process of automobile panels, such as the die face, blank properties, clearance between punch and die, the blank holder force, the blank shape, drawbeads, friction conditions and so on. Among the methods to determine the blank shape, the inverse FEM is superior to the traditional method in efficiency and accuracy, however its accuracy can't satisfy the practical requirements and the modification on blank by increment finite element method is not quantitative. The blank modification based on section line change was proposed in the paper, which can make quantitative modification. Prior to the determination of blank shape, the process design and the forming analysis should be accomplished. Parametric design and rapid forming analysis based on the software FASTFORM can improve the design efficiency greatly. Taking the trunk lid of Jiangdu Hongyun Automobile Manufacture Factory as an example, the die face design and the forming analysis were accomplished. Under the premise of ideal blank outline, the corresponding blank was determined. After the die face design and the determination of blank shape, the stamping process was simulated by software DYNAFORM and the other process parameters, such as drawbeads, the blank holder force, punch velocity, clearance between punch and die, friction conditions and so on, were optimized based on orthogonal experiment method.