After the shot peening of the casting, if the whole surface is blackened or there are obvious black marks and black spots in some parts, some can be thrown away, and some have been immersed in the casting matrix, and the area and position are not fixed.
Cause Analysis:
1. Defects that existed before the shot peening brought by the die casting process:
(1) Too much black oil is used in die casting;
(2) Punch oil splashes when the mold is opened;
(3), paint splashing during die casting;
2. The product is placed for too long or the temperature is humid, and the surface is corroded, moldy or dusty.
3. The dust removal device of the shot blasting machine fails, and the steel shot contains a lot of dust.
4. The operator did not wear gloves as required, and directly touched the surface of the casting after shot peening, resulting in fingerprints.
5. After shot peening for a long time, there is dust on the surface or splashes with water and oil, and the environment is humid and oxidized.
Steel shot is widely used for descaling and rust removal treatment
How are steel shot and grit used to treat steel surfaces?
Steel shot is widely used for descaling and rust removal treatment
What are the unique characteristics of steel shot?
