Testing method of stamping parts

After completing the stamping parts process, we do many tests to determine the quality of a product. We usually use touch inspection, oilstone polishing, flexible gauze polishing, oil coating inspection, visual inspection, and inspection tools. It is often necessary to check the quality of stamping parts when purchasing them; that’s why we have written this guide.


Touch Test
Oilstone Grinding
Flexible Gauze Polishing
Oiling Inspection
Visual Inspection
Inspection Of Inspection Tools
The Bottom Line

Touch test

Clean the surface of the outer cover with clean gauze. The inspector shall wear touch gloves to touch the surface of the stamping along the longitudinal direction of the stamping. This inspection method depends on the inspector’s experience. If necessary, oil stone can polish the detected suspicious area and verify it, but this method is an effective and rapid inspection method.

Oilstone grinding

1. First, clean the surface of the outer cover with clean gauze, and then polish it with oilstone (20 × 20 × 100mm or more). The places with arc and the places challenging to contact are polished with relatively small oilstone (for example, 8 × 100mm semi-circular oilstone)

2. The choice of particle size depends on the surface conditions (such as roughness, galvanizing, Etc.). Fine-grained oilstone is recommended. The polishing direction of the oil stone is basically along the longitudinal direction, and it fits well with the surface of the stamping part. In some particular places, horizontal polishing can be supplemented.

Flexible gauze polishing

Clean the surface of the outer cover with clean gauze. Use a flexible sand net to stick to the surface of stamping parts and polish it to the whole surface longitudinally. Any pockmarks and indentations will be found easily.

Oiling inspection

Clean the surface with gauze and apply oil evenly on the whole outer surface of the stamping part with a clean brush in the same direction. Put the pressed parts coated with oil under strong light for inspection. It is recommended to erect the pressed parts on the vehicle body. This method makes it easy to find tiny pockmarks, hollows, and ripples on the stamping parts.

Visual inspection

Visual inspection is mainly used to find stamping parts’ appearance abnormalities and macro defects.

Inspection of inspection tools

Put the stamping parts into the testing tools, and test the stamping parts according to the operating requirements of the inspection tool manual.

The Bottom Line

In actual production, technological tests similar to the stamping process, such as drawing and bulging performance tests, are often used to check the stamping performance of materials to ensure the quality of finished products and a high pass rate. The accuracy and structure of the die directly affect the forming and accuracy of the stamping parts. Die manufacturing cost and life are important factors affecting stamping parts’ cost and quality. The above is the introduction of the inspection method of stamping parts.

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