Compared with general stamping products, automobile body stamping parts belong to the category with stricter and more difficult requirements. The fabrication material of body stamping parts is relatively thin, the external dimensions are large, and the shapes are various, and the surface quality requirements of complex shapes are high. In actual production, automotive stamping parts are generally regarded as a special category of stamping parts to be studied separately. The requirements of auto body stamping parts mainly include the following aspects:
1. The surface quality of the product.
Any minor flaws on the surface of the stamped parts of the automobile body will be realized after painting, affecting the beauty of the product, because the surface of the stamping parts of the automobile is not allowed to have ripples, wrinkles, dents, edge scratches, scratches and other damages Some flaws in the aesthetics of the surface. Automotive stamping parts require that the upper ribs and decorative ridges are clear, smooth, uniform in transition and symmetrical from left to right, and the ridges between the outer stampings of the automobile body must be connected smoothly, and there should be no uneven contrast. Stamping parts not only need to meet the structural and functional requirements, but also the surface quality requirements.
2. Overall size and shape.
Most of the shapes of automobile body stampings are three-dimensional shapes, so it is difficult to accurately and completely express their size and shape in automobile body stampings. Therefore, mold designers generally use the main model to determine the shape of automobile body stampings. Dimensions. The main model is the main basis for the modeling of automobile body stamping parts, not only all the dimensions and shapes marked on the drawing of automobile body stamping parts, including the positions and shapes of various holes, three-dimensional surface shapes, shape transition dimensions, etc., must be consistent with the main model. The models are the same, and the dimensions that cannot be marked for the same kind of auto body stamping parts should be measured by the main model. In a sense, the main model is a necessary supplement to the drawing of the auto body stamping parts. In addition, because the shape of the stamping parts of the automobile body is very complex, it is very difficult to control the springback of the material, which increases the difficulty of controlling the accuracy of the product shape and size.
3. Strength and rigidity.
When the stamping parts of the automobile body are deep-drawn, because the thinning rate does not meet the requirements and the plastic deformation is not uniform, the rigidity of some parts is usually relatively poor, causing the product to sink locally. Moreover, the automobile body stamping parts with unsatisfactory strength and rigidity will produce a hollow sound when they are vibrated. If such automobile body stamping parts are assembled into a car, and the car will vibrate at high speed, it will seriously reduce the automobile body. The life of stamping parts. In summary, the strength and rigidity of automobile body stamping parts have a very important influence on the quality of automobile body stamping parts.
4. Processing technology.
The structure, shape and size of automobile body stamping parts determine the complexity of the process. It is impossible to directly process it in one process, and at least three fabrication processes are required. However, the spatial surface shape of the automotive body stamping parts and the bosses, ribs and ridges on the surface should be formed by one-time deep drawing as much as possible, otherwise it is difficult to ensure the smooth surface of the automotive body stamping parts and the consistency of the geometric shape.
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