What are the characteristics of ultra-precision grinding of bearing rings?

Ultra-precision grinding refers to a machining method in which the workpiece rotates at a certain speed under good lubrication conditions, while the fine grindstone is pressed on the machined surface of the workpiece with a certain pressure and oscillates back and forth in the direction perpendicular to the rotating direction of the workpiece. It has the following characteristics: 1. It can effectively reduce the ripple. In the process of ultra-precision grinding, when the contact arc between the grinding wheel and the workpiece is greater than or equal to the wavelength of the surface waviness of the workpiece, it can be ensured that the grinding wheel always acts on the peak and does not contact with the groove, so that the contact pressure of the peak is greater and the convex peak is cut off, thus reducing the waviness. 2. Improve the groove error of ball bearing raceway. Ultra-precision grinding can effectively improve the groove error of raceway, generally by about 35%. 3. It can make the superfinishing surface produce compressive stress. Cold forming deformation mainly occurs in ultra-precision grinding process, so residual compressive stress is formed on the surface of workpiece after ultra-precision grinding. 4. Reduce the surface roughness value. 5. The contact area of the working surface of the ferrule can be increased. After superfinishing, the contact bearing area of the ferrule working surface can be increased from 15% ~ 40% after grinding to 80% ~ 95%. 6. High production efficiency, low labor intensity and easy automation.

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