Machine tool industry ultra-precision bearings

Bearings are one of the widely used accessories in machine tools. The performance and accuracy of bearings directly affect the quality of use of machine tools. There are also various types of bearings. Its type, structure, configuration, accuracy, installation, adjustment, and cooling are all directly Affect the working performance of the spindle assembly. It is necessary to choose the appropriate bearing according to the specific use in order to play the greatest role. Therefore, the correct selection of bearings is one of the important contents of the configuration of machine tool spindle components.

Ultra-precision bearings are very core components of machine tools and turntables. The well-known ultra-precision bearings in the machine tool industry can be mainly divided into spindle bearings, ultra-precision cylindrical roller bearings, thrust angular contact ball bearings and other types.

Machine tool spindle bearings are spindle bearings for precision machine tools and similar equipment, which guarantee the working accuracy and performance of precision machine tools. The correct configuration of spindle bearings refers to the combination of bearing types and the arrangement of front and rear bearings. Different configurations determine the different load capacity, operating speed, stiffness, temperature rise and service life of the machine tool spindle, especially the impact on stiffness and temperature rise. It is more significant, so the main shaft bearing should be reasonably configured according to the requirements of the working characteristics of the machine tool.

The purpose of the running-in operation is to make the rollers and the raceway of the bearing pass through the running-in and have good contact conditions before the bearing is officially used, so as to maintain the good contact accuracy of the bearing, and to avoid the bearing from running at high speed and heavy load at the beginning. The roller and the raceway will be damaged when used under load, thereby improving the life and precision of the bearing. Because the tapered roller bearing is not in complete rolling contact, there is sliding between the end face of the roller and the shoulder of the inner ring. If The contact condition is not good, and the phenomenon of occlusal damage is easy to occur, so more attention should be paid to the running-in operation of this type of bearing.

Super-precision cylindrical roller bearings are frequently used in machine tools and printing machinery, where they enable bearing arrangements with high precision, high radial stiffness and very high load carrying capacity. In the design of machine tools, they provide radial support for the spindle, mainly for the strong ability to bear radial loads, and are suitable for the field of machine tools that require high rotation accuracy and fast speed.