Pressing is the most widely used processing method in hardware processing. Metal stamping refers to the mold for steel or non-ferrous metals and other plates at room temperature, which is formed into a specified shape by the pressure provided by the press. So how do metal stamping manufacturers inspect the quality of metal stamping parts?

For metal stamping processing, we should first control the quality of raw materials. The inspection period can be divided into material acceptance and material cleaning, pre production inspection, and material after. Next, the formed stamping parts can be inspected by the following five inspection methods.

5 inspection methods

Touch test

Wipe the surface of the outer cover with clean gauze. The inspector shall wear touch gloves to touch the surface of the stamping part longitudinally along 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 is an effective and rapid inspection method.

Oilstone grinding

1. First, wipe the surface of the outer cover with clean gauze, and then polish with an oilstone. Where there is an arc and where it is difficult to touch, polish with a relatively small oilstone.

1. The choice of particle size of oilstone depends on the surface condition. Fine-grained oilstone is recommended. The grinding direction of oilstone is basically along the longitudinal direction, and it fits well with the surface of stamping parts. Some special places can also be supplemented with horizontal grinding.

Flexible gauze grinding

Wipe the surface of the outer cover with clean gauze. Use a flexible sand net to stick to the surface of the stamping part and grind it longitudinally to the whole surface. Any pitting and indentation will be easily found.

Oiling inspection

Wipe the surface of the outer cover with clean gauze. Then use a clean brush to evenly apply oil in the same direction to the entire outer surface of the stamping part. Put the oiled stamping parts under strong light for inspection, and it is recommended to erect the stamping parts on the vehicle body. With this method, tiny pits, hollows, and ripples on stamping parts can be easily found.

Visual inspection

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

Advantages of metal stamping parts

1. During metal stamping, the size and shape accuracy of metal stamping parts are guaranteed by the mold, which generally does not damage the surface quality of stamping parts, and the service life of the mold is generally long, so the quality of metal stamping is stable.

1. Hardware stamping can process parts with a large size range and complex shapes, such as stopwatches as small as clocks, automobile longitudinal beams, covering parts, etc. coupled with the cold deformation hardening effect of materials during hardware stamping, the strength and stiffness of hardware stamping are high.

1. The production efficiency of metal stamping processing is high, the operation is convenient, and it is easy to realize mechanization and automation. This is because metal stamping depends on stamping dies and stamping equipment to complete the processing. The number of strokes of ordinary presses can reach dozens of times per minute, and the high-speed pressure can reach hundreds or even thousands of times per minute, and each stamping stroke may get a punch.

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