How to check hardware precision shrapnel?

Hardware precision shrapnel is everywhere in life. It is a mechanical part that uses elasticity to work. Usually made of metal shrapnel steel. Hardware precision shrapnel is used to control the movement of machine parts, severe shock or vibration, store energy, measure force, etc. Hardware precision shrapnel is widely used in machine and appearance. There are many kinds of hardware precision shrapnel. Divided by shape, there are mainly spiral metal shrapnel, reel metal shrapnel, flat metal shrapnel, etc.

First, the method of checking the hardware shrapnel

Touch Check: Wipe the surface of the cover with a clean gauze. Inspectors should wear touch gloves and touch the surface of stamping parts longitudinally. This inspection method depends on the inspector’s experience. If necessary, you can sand the suspicious area with a whetstone and verify it, but this method is an effective and quick way to check.

Polishing with elastic gauze: Wipe the surface of the cover with a clean gauze. The flexible sand screen is used to stick to the surface of the stamping part, and it is polished to the entire surface in the longitudinal direction, and any pitting and indentation can be easily found.

Oiling check: Wipe the surface of the cover with a clean gauze. Then use a clean brush to evenly coat the entire surface of the metal stamping in the same direction. Check oiled stampings under bright light. It is recommended to erect the stampings in the direction of the body. With this method, it is easy to spot small pits, dimples and ripples on the stamped part.

Whetstone grinding: first clean the surface of the outer cover with a clean gauze, then use a whetstone (20201000mm or larger) to polish, and use a relatively small whetstone (such as a 8100mm semi-circular whetstone) to polish it into a curved shape, which is not easy to touch. The particle size of the oil depends on the surface conditions (such as roughness, electroplating, etc.). Fine-grained petroleum is recommended. The grinding direction of the oil is basically vertical, matching the surface of the stamped part, and more parts can compensate for the lateral grinding.