The main methods for stamping parts inspection are, generally speaking, the following:
Method one: touch test
A gauze is used to clean the surface of it, and then the inspector takes a touch glove and touches the longitudinal direction of the stamping part. It is a fast and effective way, but it needs some experience.
Method two: flexible gauze grinding
Use a gauze to clean the surface of it, then use a flexible sand net to close the surface of the stamping part and grinding the whole surface along the longitudinal direction to check whether there is a indentation or a point on the surface.
Method three: oil coating inspection
First use gauze to clean the surface of it, then oil the whole surface, pay attention to the direction of the oil painting to keep the same. Then, put it under the strong light to check, whether there are pitting, ripple, etc.