The shaft parts of CNC lathes, especially the angular contact spindle bearings, generally rotate at a very high speed ratio, which sometimes causes very high heat generation. If this situation is not intervened for a long time, it will cause the angular contact ball bearing to overheat, and cause the temperature of the corresponding position of the CNC lathe to rise to cause thermal expansion, and may even cause the machine tool spindle to be out of balance with the tailstock, which will not only affect the precision of the CNC lathe itself And dimensional accuracy, and will burn the bearing. Rating fatigue life refers to the total speed at which 90% of the angular contact ball bearings do not fall off due to overturning fatigue when a group of bearings of the same type are operated in the same environment. When the speed ratio is stable, the total running time is often used to express the fatigue life of the rated value. When studying the life of angular contact spindle bearings, we should not only consider the fatigue life, but also consider the performance of the bearing comprehensively. For example, the grease life of a grease lubricated bearing. Noise life, damage life, etc., depending on the application, the application limit standards are different, so most of the experience limits are selected in advance. The useability of angular contact bearings is usually determined by considering the level of bearing damage, physical properties, necessity, operating standards, and the period until the next maintenance. If it has the following defects, it can no longer be used, and it must be replaced with a new thrust ball bearing. Cracks or voids on any of the inner bore, outer side, rolling elements, and ball bearings. Wear failure is one of the more common failure modes of various bearings. According to the damage mode, it can be generally divided into relatively common abrasive wear and adhesive wear. Only when the torque is accurate can the rotation be stable! (http://)
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