Touch test
Clean the surface of the outer cover with a clean gauze. The inspector needs to wear a touch glove to touch the surface of the stamping part along the longitudinal direction of the stamping part. This inspection method depends on the inspector's experience. If necessary, whetstones can be used to polish the suspected area of ​​interest and verify it, but this method can be regarded as an effective method of rapid inspection.
2. Oil inspection
Clean the surface of the outer cover with a clean gauze. Then use a clean brush to evenly apply oil to the entire outer surface of the stamping in the same direction. The stamped parts coated with oil should be tested under strong light. It is recommended to place the stamped parts upright on the body. With this method, it is easy to find tiny pits, ripples, and ripples on stampings.
3. Polishing of flexible gauze
Clean the surface of the outer cover with a clean gauze. The surface of the stamping part is closely attached to the entire surface by means of a flexible sand net, and any pits or indentations can be easily found.
4. Polished stone
1) First, clean the surface of the outer cover with a clean gauze, and then grind it with a whetstone (20×20×100 mm or larger), where the arc is hard to reach and the whetstone is relatively lightly ground. (Example: 8×100mm semicircular whetstone)
2) The selection of the particle size of the stone depends on the surface conditions (eg roughness, galvanization, etc.). It is recommended to use fine-grained whey stone. The direction of grinding of the whetstone is basically in the longitudinal direction, and it fits well on the surface of the stamping part. Part of the special place can also supplement the horizontal grinding.
5. Visual inspection
Visual inspection is mainly used to find abnormal appearance and macro defects of stampings.
6. Detector detection
Put the stamped parts into the inspection tool and test the South Leather stamping parts according to the operation requirements of the inspection specification.
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