1. Touch check: Wipe the surface of the lid with a clean gauze. The inspector should wear touch gloves and touch the surface of the metal stamping shot. Such inspection methods depend on the inspector's experience. If necessary, you can use oil and stones to polish the abnormal area and verify. This method is an effective and fast check method.

2. Soft gauze polishing: Wipe the surface of the lid with a clean gauze. Soft sand sieve is used to closely adhere to the surface of the metal stamping shot, and polish the entire surface along the vertical. During the processing of automated hardware parts, it is easy to detect any erosion and flowers.

3. Oil sewage inspection: Wipe the surface of the outer cover with a clean gauze. Then wipe the entire surface of the metal hardware stamping the shot of the metal hardware along the same direction. Check the stamping parts coated with organic oil under strong light. It is recommended to install the metal stamping shot on the body. In this way, it is easy to find tiny concave pits and ripples in metal stamping shy.

4. Polish oil: First, clean the surface of the outer cover with a clean gauze, and then polish with oil stones (20201000mm or larger). Local use of relatively small oil stones (such as 8100mm semi -circular oil stones) is polished into curved, and it is not easy to contact. The particle size of the oil depends on the surface conditions (such as roughness, electroplating, etc.). It is recommended to use fine sandstone for external processing. The grinding direction of oil stones is basically vertical. It is consistent with the surface of the metal stamping shell, and some additional parts can compensate the horizontal grinding.