Stainless steel's beautiful appearance, excellent corrosion resistance, and high temperature oxidation resistance make stainless steel products popular among people, and they are more and more widely used in light industry, chemical industry, decoration, kitchen equipment and other industries. However, the appearance quality of stainless steel products is relatively high, so during the processing of the product, it is necessary to ensure high brightness and no scratches on the surface of the product. This requires relatively high processing of stainless steel, especially due to the deep drawing characteristics of stainless steel sheets. Die material selection, processing, process lubrication and heat treatment directly affect product quality, output, quality and die life.
Stainless steel has high yield point, high hardness and significant cold work hardening effect. Stainless steel sheet has the following characteristics when deep drawing:
1. The stainless steel sheet is deep drawn, and the plastic deformation is severely hardened. When the sheet is deep drawn, it is easier to wrinkle, and a large blank holder force is required;
2. Since the thermal conductivity of the stainless steel sheet is worse than that of ordinary low carbon steel, the required deformation force is large;
3. In the process of deep drawing of stainless steel sheet, the phenomenon of sticking nodules is easy to occur;
4. The springback caused by the bending and reverse bending of the stainless steel sheet at the corner of the deep drawing die usually forms a concave deformation on the side wall of the product, so that products with high dimensional accuracy and shape requirements need to increase the shaping process to achieve.
Once the bond tumor is formed, it is difficult to fall off, and the more sticky it is, the bigger it is, so that scratches are left on the surface of the stainless steel sheet deep drawing product, and the drawing speed and the deformation size of the sheet also have an impact on the formation of the bond tumor. important role. The technical difficulty of deep drawing of stainless steel sheet is how to avoid the formation of bond nodules.