1. Oiling inspection
Wipe clean the surface of the outer cover with clean gauze. Then use a clean brush to apply oil evenly to the entire surface of the stamping in the same direction. The oiled stamping parts are inspected under strong light, and the stamping parts should be erected on the body position. This method can easily find tiny pits, pits, and ripples on the stamping parts.
2. Visual inspection
Visual inspection is mainly used to find abnormal appearance and micro-defects of stamping parts.
3. Contact inspection
Wipe clean the surface of the outer cover with clean gauze. The inspector needs to wear contact gloves to make contact with the outer surface of the stamping part along the longitudinal direction of the stamping part. This inspection method depends on the inspector’s experience. Whetstone can be used to polish the detected suspicious area and verify it when necessary, but this method can be regarded as an effective quick inspection method.
4. Polishing of flexible gauze
Wipe clean the surface of the outer cover with clean gauze. Use a flexible sand net to closely adhere to the surface of the stamping part and polish it to the entire surface in the longitudinal direction. Any pitting or indentation will be easily found.
5. Whetstone polishing
- ①. First wipe the surface of the outer cover with clean gauze, and then use oilstone for polishing. Use relatively small oilstone for areas with arcs and hard-to-reach areas.
- ② The choice of the size of the oilstone depends on the appearance. Advocate the use of fine-grained oilstone. The direction of the oilstone polishing is basically along the longitudinal direction, and it fits well with the appearance of the stamping parts, and some special places can also compensate for the horizontal polishing.