How to check the quality of metal stamping parts? Stamping is one of the most widely used processing methods in hardware processing. Hardware stamping refers to the die used for steel or nonferrous metal and other plates at room temperature, which is formed into the specified shape with the pressure provided by the press. How do hardware stamping manufacturers inspect the quality of hardware stamping parts? For metal stamping processing, we should first control the quality of raw materials. The inspection time can be divided into material acceptance and inspection before material cleaning, inspection before production and inspection after materials. Next, the formed stampings can be inspected by the following five inspection methods.
1、 Touch test
Wipe the surface of the outer covering with clean gauze. The inspector needs to wear touch gloves and touch along the longitudinal direction of the stamping parts close to the surface of the stamping parts. This inspection method depends on the experience of the inspector. If necessary, the suspected area detected can be polished with an oilstone and verified, but this method is an effective and fast inspection method.
2、 Oil stone grinding
1. First, clean the surface of the outer cover with clean gauze, and then polish with an oilstone. Use a relatively small oilstone to polish the areas with arcs and areas hard to reach
2. The choice of stone size depends on the surface condition. Fine grained oilstone is recommended. The grinding direction of the oilstone is basically along the longitudinal direction, and it fits the surface of the stamping parts well. In some special places, the horizontal grinding can also be supplemented.
3、 Flexible screen grinding
Wipe the surface of the outer covering with clean gauze. Use flexible sand mesh to grind the surface of stamping parts to the whole surface along the longitudinal direction, and any pitting and indentation will be easily found.
4、 Oiling inspection
Wipe the surface of the outer covering with clean gauze. Then use a clean brush to evenly apply oil to the entire outer surface of the stamping along the same direction. Put the oiled stamping parts under strong light for inspection, and it is recommended to erect the stamping parts on the vehicle body. With this method, it is easy to find tiny pits, pits and ripples on the stamping parts.
5、 Visual inspection
Visual inspection is mainly used to find the appearance abnormalities and macro defects of stamping parts.