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Optimizing Ultra-thin Sheet Punching Die Structures
With the development of Chinas automotive industry, ultra-thin sheets are widely used in car body parts. The punching process of ultra-thin sheets mainly refers to stamping die process, which needs to form a metal sheet into a pre-designed shape by compressing it through pre-processed opening on the die. The basic structure of punching die is composed of die shoe, bolster, punch, stripper, guide pin, return pin, bushing, etc. The overall performance of punching die is mainly affected by the structure of the die, materials used in the die and processing technology.
In order to improve the punching performance of ultra-thin sheet and extend die life, the following optimization methods can be used.
1. Choose the appropriate type of die. The characteristics of the ultra-thin sheet mainly include its excellent ductility, which can be well adapted to various molding processes. The suitable die should be selected based on the different thicknesses and shapes of the sheet to be punched. During the choice of die, the mold strength, surface finish and overall service life should be taken into consideration.
2. Wear-resistant materials and special surface treatments. Obviously, it is necessary to strengthen the wear resistance of ultra-thin sheet punching die in order to extend the die life. Suitable wear-resistant materials should be used in the die, such as quenching and tempering steel, heat-resistant high speed steel and hot extrusion die steel. Through heat treatment, the metal parts of the die can also be hardened and its overall toughness increased. In addition, special surface treatments can also be used on the surface of various parts of the die, such as polishing, grinding and shot blasting to improve wear resistance and rust prevention.
3. Improvement of structural parameters. When analyzing the structural parameters of the die, the thickness of the die, the length of the counter blade, the length of the crowd, the shape of the punch, the size and shape of the auxiliary line and the shape of the clearance line should all be taken into consideration. Improving the structural parameters of the ultra-thin sheet punch die can make the stamping force more reasonable, reduce the friction between the stamping materials, improve the stamping precision, reduce the stickiness of materials and avoid deformations.
In conclusion, if the above optimized measures are adopted, the punching performance of ultra-thin sheet can be improved and its die life can be extended.
