Analysis of the Causes of Surface Scratches on Stamping and Drawing Parts

In the process of stamping and drawing parts, sometimes there will be surface scratches. When this problem occurs, we need to analyze the cause in time and how to prevent it and avoid unnecessary waste. It is also a very basic appearance requirement to ensure that the surface of the stamping product is smooth, scratch-free, and scratch-free. 1. When performing continuous bending of soft materials such as copper and aluminum alloys, metal particles or scum are easy to adhere to the surface of the working part, causing larger scratches and scratches on the workpiece; 2. The bending direction and material When the rolling direction is parallel, cracks will occur on the surface of the workpiece, which will reduce the surface quality of the workpiece. When bending at two or more parts, ensure that the bending direction and the rolling direction have a certain angle as much as possible; 3. The radius of the die fillet is too small, and impact marks appear on the bending part. Polish the concave mold and increase the radius of the corner of the concave mold to avoid scratches on the curved parts; 4. The gap between the convex and concave molds should not be too small. If the gap is too small, it will cause thinning and scratches. In the stamping process, always check the change of the gap of the mold; 5. When the depth of the punch into the concave mold is too large, the surface of the part will be scratched, so it should be appropriately reduced while ensuring that it is not affected by springback The depth of the punch into the concave mold. [Related recommendation] Learn more: What are the methods for polishing the surface of stainless steel? Learn more: Manufacturing characteristics of automotive stamping parts molds Learn more: Points to note in the design of continuous stamping dies