Problem Description:

 Defects such as scratches, abrasions, indentations, and burrs appear on the surface of the stamped parts, which affect the appearance quality and subsequent processing.

Cause Analysis: 

The surface roughness of the die is insufficient, and there are machining tool marks or wear, resulting in the surface of the stamped parts being scratched. During the stamping process, there are foreign objects between the sheet metal and the die, such as dust, metal chips, etc., which will cause surface indentations or abrasions. The blanking clearance is not reasonable. Either being too large or too small will lead to the generation of burrs.

Solution: 

Grind and polish the surface of the die to reduce the surface roughness and improve the surface quality of the die. Regularly clean the die and stamping equipment, and adopt protective measures during the production process, such as installing a dust collection device, to prevent foreign objects from entering between the die and the sheet metal. According to the thickness and properties of the material, reasonably adjust the blanking clearance. For materials such as stainless steel, the clearance generally accounts for 10%-15% of the material thickness.