At present, the most widely used high-speed spindle bearings are still hybrid ceramic ball bearings, that is, the rolling elements use hot-pressed or hot-isostatic pressed Si3N4 ceramic balls, and the bearing rings are still steel rings. This kind of bearing has a high degree of standardization, low price, little change to the machine tool, and is easy to maintain, especially suitable for high-speed operation occasions. Its d·n value has exceeded 2.7×106. In order to increase the service life of the bearing, the wear resistance of the raceway can be increased, and the raceway can be coated or other surface treatment. There is no certain order or rules for selecting bearings. The priority should be the conditions, performance, and most relevant matters required for the bearings, especially practical. Rolling bearings are precision components and must be used with corresponding care. No matter how high-performance bearings are used, if they are not used properly, the expected high performance will not be obtained. Precautions for the use of bearings are as follows. a. Keep the bearing and its surroundings clean. Even small dust, invisible to the eyes, can have a bad effect on bearings. Therefore, keep the surrounding clean so that dust does not invade the bearing. the b. Use with caution. If a bearing is subjected to a strong impact during use, scratches and indentations may occur, which may cause accidents. In severe cases, it will crack and break, so be careful. the c. Use appropriate operating tools. Avoid substituting existing tools, use the right tools. the d. Pay attention to the corrosion of the bearing. Sweat from hands when handling bearings can be the cause of rust. Pay attention to operate with clean hands, it is best to wear gloves as much as possible. In order to maintain the original performance of the bearing in good condition for as long as possible, maintenance and repair are required to prevent accidents before they happen, ensure the reliability of operation, and improve productivity and economy.  

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