In the automotive stamping industry, stamping is sometimes called sheet forming, but it is slightly different. The so-called plate forming refers to the forming method of CNC machining plastic fabrication using plates, thin-walled tubes, thin profiles, etc. as raw materials, which is collectively referred to as plate forming. At this time, the deformation of the thick plate direction generally causes hardware damage and prevention measures.
According to the temperature during stamping, there are two methods: cold stamping and hot stamping. This depends on the strength, plasticity, thickness, degree of deformation and equipment capacity of the material, etc., and the original heat treatment state and end-use conditions of the material should be considered. Any rolled sheet has anisotropic physical properties. If the bending line is the same as the rolling direction, cracks are easy to appear at the bend; if the bending line is perpendicular to the rolling direction, cracks are not easy to appear at the bend.
There are three solutions:
- 1. If the design allows, choose a softer material;
- 2. If the design allows, the arc radius of the bending can be increased;
- 3. When blanking the stamping parts, pay attention to the rolling direction, and try to make the bending line and the rolling direction at a corresponding angle.
The stamping process can be roughly divided into two categories: separation process and forming process (also divided into bending, deep drawing, and forming). The separation process is to separate the stamping part and the blank along the corresponding contour lines during the stamping process, and the quality of the separated section of the stamping part must also meet the corresponding requirements; the forming process is to make the stamping blank plastic deformation under the condition of no damage, And convert it into the required finished shape, and at the same time, it should also meet the requirements of dimensional tolerance and so on.
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