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        Stamping direction selection is an important part in die design. It not only determines whether a satisfactory drawing piece can be drawn, but also affects the number of supplementary parts and the shape of blanking surface. The stamping direction includes two aspects, that is, the location of the production and the processing direction of the technological characteristics. Locally, each process feature has its best punching direction. However, the stamping process of panel often contains many process features, and the optimal stamping direction of each process feature is not consistent. Therefore, to determine the stamping direction of a process feature, not only the stamping feasibility of this feature should be considered, but also the coordination with other process features should be considered. Therefore, in the process of process design, it is an optimization problem to determine the stamping direction of all process characteristics of a process.

        Most automotive panels are of complex spatial curved surface shape, which is formed by sheet metal drawing. The deformation is very complex, so it is necessary to optimize the stamping direction. In the process of optimizing stamping direction, the material flow in the stamping process is analyzed firstly, and the principle of determining the stamping direction is put forward. According to the principle, a mathematical model is established, and then the CAD technology is used to optimize the stamping direction.

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