1. The preparation of the stamping process mainly relies on practical experience and data accumulation. Due to the influence of several uncontrollable human factors in the stamping process of car parts mould, it is impossible to use the theory of sheet plastic deformation to guide the stamping process design. The theoretical application conditions are harsh. Now the plastic deformation demonstration analysis software can only play the role of verifying the process. The stamping process of automobile panels mainly relies on long-term accumulated practical experience and accumulated data.
2. The stamping process is mostly composite. Due to the large size and complex shape of the cover, it is difficult to locate and move. Therefore, composite molds are often used for cover parts, and progressive molds are rarely used. For narrow and long parts, multi-station die or joint installation is sometimes used and progressive die is not used.
3. The basic process of punching cover parts is forming process, trimming and punching process, and flanging shaping process. The forming process is the key process. To obtain sufficient plastic deformation of the cover, thereby improving the rigidity of the cover, the forming process generally uses a drawing process instead of a pressing process.
4. Use a press with a large work surface and a relatively small nominal pressure. The requirements for presses for pressing automobile molds are generally that the work surface is relatively large to adapt to the relatively large structure size. Since the cover is made of a thin plate and the deformation force is small, the effective tonnage of the press does not need to be large. For the accuracy of the press, the requirements are also higher due to the thin plate used for the cover, the small gap between the molds, and the accuracy of the cover itself. The most commonly used are closed four-point mechanical presses.