High-speed machining can not only improve production efficiency and reduce production costs, but also help improve the surface processing quality of parts. In addition, with the development of material science, many new materials have been widely used, represented by aluminum and its alloys, many light metals and non-ferrous metals have been widely used in aviation, aerospace, automotive and other engineering fields to reduce the weight of parts , The processing of these materials requires high-speed cutting. Then the increase of the cutting speed means the increase of the spindle speed of the machine tool. At the same time, the spindle bearing model of the key accessory of the spindle component is required to have the corresponding high-speed performance, thus promoting the development of the spindle bearing technology.
Structural Types of Spindle Bearings Common types of machine tool spindle bearings include deep groove ball bearings, angular contact ball bearings, cylindrical roller bearings, bidirectional thrust angular contact ball bearings, tapered roller bearings and thrust ball bearings. Among them, angular contact ball bearings have high manufacturing precision, high limit speed, strong bearing capacity, and can bear radial and axial loads in one direction at the same time. Therefore, they are widely used in the support of high-speed machine tool spindles. High-speed angular contact ball bearings usually use 15° and 25° contact angles. Figure 1 shows the common structural type of high-speed machine tool spindle bearings. Figure 1 The structure of the high-speed machine tool spindle bearing In Figure 1, the B7000-2 RZ type is a newly developed grease-lubricated sealed angular contact ball bearing developed by Luoyang Bearing Research Institute. The bearings of the same specification of the structure are interchangeable. The structural bearing has the characteristics of good high-speed performance, good rigidity, low temperature rise and long service life. The other three types of bearings can be used for both oil lubrication and grease lubrication, among which H7000 type bearings are more suitable for oil and gas lubrication.