What Is The Bearing Superfinishing Process?

What is super precision bearing?

The superfinishing process of bearings is a kind of finishing processing method in which a feed motion is used to achieve micro-grinding.

The surface before superfinishing is generally precision turned and ground. Specifically, under good lubricating and cooling conditions, use a fine-grained abrasive (oil stone) to exert a small pressure on the workpiece, and perform fast and short reciprocating oscillations on the workpiece rotating at a certain speed in the vertical direction of the workpiece rotation. A finishing method for sports.

What is the function of bearing superfinishing?

In the manufacturing process of rolling bearings, superfinishing is the final process of bearing ring processing. It can reduce or eliminate the circular deviation left by grinding, repair the shape error of the groove, refine its surface roughness, and improve the physical and mechanical properties of the surface. , It plays an important role in reducing the vibration and noise of the bearing and improving the mission of the bearing.

Specifically, it can be reflected in the following three aspects

1. Can effectively reduce waviness. In the super-finishing process, in order to ensure that the whetstone always acts on the wave crest and not in contact with the trough, the arc of the whetstone in contact with the workpiece is greater than or equal to the wavelength of the surface waviness of the workpiece. In this way, the contact pressure of the wave crest is relatively large, and the convex peak is cut away, thereby reducing waviness.
2. Improve the groove shape error of the ball bearing raceway. Super-finishing can effectively improve the groove shape error of the raceway by about 30%.
3. It can generate compressive stress on the surface to be ultra-finishing. During the superfinishing process, cold plastic deformation mainly occurs, so that residual compressive stress is formed on the surface of the workpiece after superfinishing.
4. It can increase the contact area of the working surface of the ferrule. After super fine grinding, the contact support area of the working surface of the ferrule can be increased from 15% to 40% after grinding to 80% to 95%.