How to inspect the quality of hardware stamping parts?

Stamping is the most commonly used processing method in hardware processing. Hardware stamping parts refer to molds used for steel or non-ferrous metal plates at room temperature, which are formed into a specified shape by a press machine providing the required pressure for processing.
For metal stamping processing, we first need to control the quality of raw materials. The inspection period can be divided into material acceptance and material cleaning, pre production inspection, and post material inspection. Next, the formed stamping parts can be inspected using the following five inspection methods.
1、 Touch inspection
Wipe the surface of the outer cover with clean gauze. The inspector needs to wear touch gloves to touch the surface of the stamped part longitudinally, and this inspection method depends on the inspector's experience. If necessary, oil stones can be used to polish and verify the suspicious areas that have been detected, but this method is an effective and fast inspection method.
2、 Oil stone polishing
1. Firstly, clean the surface of the outer cover with clean gauze, and then use an oilstone for polishing. For areas with circular arcs and difficult to reach areas, use a relatively small oilstone for polishing
2. The choice of oil stone particle size depends on the surface condition. It is recommended to use fine-grained oilstones. The direction of oil stone polishing is basically carried out along the longitudinal direction, and it fits well with the surface of the stamped parts. In some special areas, horizontal polishing can also be supplemented.
3、 Flexible gauze polishing
Wipe the surface of the outer cover with clean gauze. Grind the surface of the stamped part longitudinally with a flexible sand mesh to the entire surface, and any pitting or indentation will be easily detected.
4、 Oil coating inspection
Wipe the surface of the outer cover with clean gauze. Use a clean brush to evenly apply oil in the same direction to the entire outer surface of the stamped part. Place the oiled stamped parts under strong light for inspection. It is recommended to place the stamped parts vertically on the vehicle body. By using this method, it is easy to detect small pits, pits, and ripples on the stamped parts.
5、 Visual inspection
Visual inspection is mainly used to detect visual abnormalities and macroscopic defects in stamped parts.