The use of rolling bearings on machine tools is mainly used in the following three parts: main shaft, ball screw and general drive shaft.

As the basic accessory of machine tool, its performance directly affects the speed, rotation accuracy, rigidity, anti-vibration cutting performance, noise, temperature rise and thermal deformation of the machine tool, and then affects the machined parts. Precision, surface quality, etc. Therefore, high-performance machine tools must be equipped with high-performance bearings.

The accuracy of rolling bearings is generally divided into five levels: P0, P6, P5, P4 and P2. The accuracy of bearings used in precision machine tool spindles should be P5 and above, while for CNC machine tools and machining centers For the spindle support of high-speed and high-precision machine tools, ultra-precision bearings of P4 and above are required.

Spindle bearings for machine tools usually include six structural types: deep groove ball bearings, angular contact ball bearings, cylindrical roller bearings, bidirectional thrust angular contact ball bearings, tapered roller bearings and thrust bearings.

With the rapid development of CNC technology, 'composite, high speed, intelligence, precision, and environmental protection' has become the main trend in the development of today's machine tool industry technology. Among them, high-speed machining can effectively improve the machining efficiency of the machine tool and shorten the machining cycle of the workpiece. This requires the machine tool spindle and its related parts to adapt to the needs of high-speed machining. At present, the spindle bearings of CNC machine tools are basically limited to four structural categories: angular contact ball bearings, cylindrical roller bearings, bidirectional thrust angular contact ball bearings and tapered roller bearings.