Causes and treatment methods for uneven surfaces of metal stamping parts

Causes and treatment methods for uneven surfaces of metal stamping parts

The uneven surfaces of metal stamping parts are mainly caused by dust or iron filings attached to the raw materials or mold surfaces. 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 effectively remove these attached iron filings and dust before stamping production or during the production process.

1. Inspection and correction of drawing dies

The drawing dies need to be inspected and maintained regularly to reduce the generation of convex and concave parts of metal stamping parts and maintain a stable state. The usual practice is to use samples to check the bonding scratches of the blank holder and the processing surface (die radius, punch radius).

2. Inspection and correction of shearing dies

The reason why metal stamping parts are convex and concave after the shearing process is that iron powder is generated during the shearing process. Therefore, the iron powder must be observed before stamping to avoid convex and concave.

3. Appropriate robot speed

For semi-automatic drawing die production, when the drawing punch is in the lower die position and the robot speed is very fast, the burr will fall on the upper part of the punch, causing the metal stamping parts to be convex and concave. To avoid this problem, we can do a discharging test of the workpiece before production, and reasonably set the speed and discharging angle of the robot so that it will not hit the workpiece and the lower die.

4. Check the cut surface

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, so before the metal stamping production, the double cut surface must be checked in the material area or stamping line, and the sheet metal must be cleaned in time to remove burrs.

5. Inspection of sheet metal cleaning device

Before metal stamping production, it is necessary to check and repair the cleaning arrangement at the same time so that it can clean the sheet metal more effectively. This is also very necessary, and attention should also be paid to the roller gap and the quality of the cleaning oil.