Home > News & Blog

Common Inspection Methods for Stamping Parts

Sep. 10, 2020

Stamping die is indispensable process equipment for stamping production and is a technology-intensive product. If the quality of the stamping die is unqualified, the quality of the entire batch of stamping parts cannot be guaranteed. The level of mold design and manufacturing technology is one of the important indicators to measure the level of product manufacturing in a country, and to a large extent determines the product quality, efficiency, and new product development capabilities. So what are the acceptance criteria for custom metal stamping parts?

1. Purpose

The external materials, internally processed parts, and assembled molds are inspected as required to ensure that the materials, parts, and molds put into use meet the expected requirements.

2. area

Applicable to all parts and molds that make up the mold, including purchased materials, subcontracted, and internally processed parts.

3. definition

Incoming material inspection: inspection of externally purchased materials and subcontracted parts. Process inspection: inspection of internally processed mold parts, semi-finished products, and finished products. Final inspection: inspection after mold assembly, including inspection of mold appearance, formability, and formed products.

4. Duty

4.1 The Engineering Department is responsible for the provision of relevant inspection data.

4.2 The quality inspection department is responsible for the incoming inspection, process inspection, and final inspection of materials, parts, and molds.

4.3 The warehouse is responsible for the quality of the purchased materials and cooperates with the quality inspection department to do the incoming inspection work.

4.4 The production department assists in the process inspection and ensures that the uninspected or unqualified materials are not put into use.

Metal Stamping Parts

Metal Stamping Parts

Testing method:

1. Touch inspection

Wipe the surface of the outer cover with clean gauze. The inspector needs to wear touch gloves 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, oilstone can be used to polish the detected suspicious area and verify it, but this method can be regarded as an effective quick inspection method.

2. Whetstone polishing


First, wipe the surface of the outer cover with clean gauze, and then polish with oilstone (20×20×100mm or larger), and polish with relatively small oilstone for arcs and hard-to-reach places (for example 8×100mm semi-circular oilstone).


The choice of whetstone particle size depends on the surface condition (such as roughness, galvanizing, etc.). It is recommended to use fine-grained oilstone. The direction of whetstone polishing is basically along the longitudinal direction, and it fits well on the surface of the stamping parts. Some special places can also be supplemented with horizontal polishing.

3. Polishing of flexible gauze

Wipe the surface of the outer cover with clean gauze. Use a flexible sand net to close the surface of the stamping part and grind it to the entire surface in the longitudinal direction. Any pitting or indentation will be easily found.

4. Oiling inspection

Wipe the surface of the outer cover with clean gauze. Then use a clean brush to apply oil evenly to the entire outer surface of the stamping in the same direction. Put the oiled stamping parts under strong light for inspection. It is recommended that the stamping parts be erected on the car body. This method can easily find tiny pits, pits, and ripples on the stamping parts.

5. Visual inspection

Visual inspection is mainly used to find the abnormal appearance and macro defects of stamping parts.

6. Inspection fixture

Put the metal stamping parts into the inspection tool, and inspect the stamping parts according to the operating requirements of the inspection tool manual.