The bearing temperature used in mechanical equipment is too high, such as the abnormal condition of 'fever', which is a common and harmful fault in mechanical equipment. The reason is unknown and improper handling will often result in twice the result with half the effort. The service life of the full complement cylindrical roller bearing , increase the maintenance cost, and even cause the bearing to burn out. The selection of the bearing type should be determined according to the type and size of the bearing, the size and direction of the load, and the nature of the load. The correct choice of bearing coordination should ensure the normal operation of the bearing and prevent the relative rotation of the inner ring and the shaft, the outer ring and the shell hole during operation. Generally speaking, when the direction of the working load is unchanged, the rotating ring has a tighter fit than the non-moving ring, because the rotating ring bears the rotating load, and the non-moving ring bears the local load. When the speed is higher, the load is larger and the vibration is stronger, the tighter fit should be selected. A tighter fit should also be used when the bearing is mounted on a thin-walled housing or a hollow shaft. However, a too tight fit is unfavorable. At this time, the internal clearance of the bearing may be reduced or even completely disappeared due to the elastic expansion of the inner and outer rings and the contraction of the outer ring. It may also be due to the irregularity of the matching shaft and seat hole surface. The irregular deformation of the inner and outer rings of the bearing due to the shape or uneven rigidity will destroy the normal operation of the bearing. Too tight fit will also make it difficult to assemble and disassemble, especially for heavy machinery. With the introduction of adaptive control technology in modern high-precision grinders and high-precision lathes, the working parameters are automatically adjusted according to changes in cutting conditions, so that the bearings can be processed during machining. Maintain the best working condition, so as to obtain higher machining accuracy and smaller surface roughness, and at the same time, it can also improve the service life of the bearing and the noise of the bearing. It has the functions of self-diagnosis and self-repair. During the whole working state, the system can carry out self-diagnosis and inspection of the CNC system itself and various equipment connected to it at any time. Once a fault occurs, measures such as shutdown are immediately taken, and a fault alarm is performed to indicate the location and cause of the fault. It can also automatically take the faulty module offline and switch on the spare module to ensure the requirements of an unmanned working environment. In order to achieve higher fault diagnosis requirements, the development trend is to use artificial intelligence expert diagnosis system. At present, the interactive automatic programming of CAD/CAM graphics has been widely used, which is a new trend in the development of numerical control technology. It is a part processing pattern drawn by CAD, and then calculated and post-processed by the tool path data in the computer. The biggest difference between CAM system programming is that the processing parameters required for its programming do not need to be manually involved. From the CAPP database, speed and precision are two important indicators of high-precision CNC grinding machines, which are directly related to processing efficiency and product quality. At present, the numerical control system adopts a processor with a higher number of digits and a higher frequency to improve the basic operation speed of the system. At the same time, the ultra-large-scale integrated circuit and multi-microprocessor structure are used to improve the data processing capability of the system, that is, to improve the speed and accuracy of interpolation operations, so that the errors of the inner and outer rings of the bearing are greatly reduced, thereby improving the machining accuracy of the bearing.