All sizes and batched should be checked. Wire material should be drew into target sizes.
Raw material is deformed into blank under natural temperature.
Removing the ring and improving the surface roughness.
Making a carburized layer, by putting balls into stove (using the method of carburization, quenching and tempering), so as to improve the hardness, toughness and crush loading. The products stability and reliability can get improved by controlling heat treatment time and temperature.
The peening machine can make balls impacting together, so as to improve the surface pressure stress and hardness.
The fixed plate and gridding wheel are working together under some pressure, to further improve the ball surface quantity and shape.
Using two lapping plates and some abrasive material, then putting on some pressure and mechanical movement, so as to reach the target surface quality.
100% human checking.
Machine checking: Photoelectricity, Eddy current, Vibration to find the defects (surface problem, cracking, material missing).
Using two lapping plates and some abrasive material, then putting on some pressure and mechanical movement, so as to further improve the balls precision and surface quality.
To improve the cleanness.
To check each batch balls and making inspection report.
12.Oil and Packaging
Taking anti-rust measures and make packaging according to customers requirement.