Method for testing automotive stamping die parts

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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An air compressor is a device that converts power (using an electric motor, diesel or gasoline engine, etc.) into potential energy stored in pressurized air (i.e., compressed air). By one of several methods, an air compressor forces more and more air into a storage tank, increasing the pressure. When the tank's pressure reaches its engineered upper limit, the air compressor shuts off. The compressed air, then, is held in the tank until called into use.


The energy contained in the compressed air can be used for a variety of applications, utilizing the kinetic energy of the air as it is released and the tank depressurizes. When tank pressure reaches its lower limit, the air compressor turns on again and re-pressurizes the tank. An air compressor must be differentiated from a pump because it works for any gas/air, while pumps work on a liquid.


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