What are the reasons for the uneven surface of metal stamping parts

The surface of metal stamping and stretching parts is uneven, which is mainly caused by dust or iron filings attached to the surface of raw materials or molds. These iron filings and dust can not only greatly reduce the appearance of stamping products, but also seriously affect the use of stamping parts. At the same time, these iron filings and dust can also affect the efficiency of stamping production. Therefore, it is necessary to remove these attached iron filings and dust before stamping production or in the production process. So what method does the metal stamping factory adopt to solve this problem? The specific methods are as follows:

1 Inspection and correction of drawing die: the drawing die needs regular inspection and maintenance to reduce the generation of convex and concave metal stamping parts and maintain a stable state. The usual practice is to use a sample to check the bonding scratch of the blank holder ring and the condition of the machined surface (concave die fillet and convex die fillet)

2. Inspection and correction of shearing die: the reason for the convex concave of metal stamping parts after the shearing process is that iron powder is produced in the shearing process. Therefore, observe the iron powder before stamping to avoid convex concave

3. Appropriate manipulator speed: for semi-automatic drawing die production, when the drawing punch is in the lower die position and the manipulator speed is very fast, the burr will fall on the upper part of the punch, causing the convex and concave of metal stamping parts. In order to avoid this problem, we can do the discharge test of the parts before production, and reasonably set the speed and discharge angle of the manipulator so that it will not touch the parts and the lower die

4. Check the cross-section: when cutting the coil, the wear and damage of the cutting die will produce a lot of tiny iron powder attached to the cutting edge. Therefore, before metal stamping production, check the double cross-section in the material area or stamping line, and clean the sheet metal in time to remove burrs

5. Inspection of sheet metal cleaning device: abide by the contract before metal stamping production, and check and repair the cleaning installation at the same time, so that it may clean the sheet metal more effectively, which is also very necessary, and pay attention to the roller clearance and the quality of cleaning oil