These inspection methods are used after known inspection of precision stamped parts to avoid any problems.
One: In the touch test, we recommend that you use a clean gauze to wipe off the outer cover of the surface, and place the inspector gloves to touch along the vertical stamping surface, of course, this method requires certain professional experience. But this is the fast way.
Two: Test method flexible yarn, mentioned here is the surface of the shell wipe clean, use a soft sand net tight towel surface to grind the entire surface longitudinally, punch, only pitting and indentation will be easily found.
Three: For the oiled test, you need to wipe the surface except the cover with a clean gauze, here you need to evenly oil the entire surface of the stamping parts along the direction with the cleaning brush, you can put the stamping parts in the strong light summer test , it can be easily found here whether there are tiny pitted corrugated cardboard on the surface of stamping parts.