At present, the most widely used high-speed spindle bearings are hybrid ceramic ball bearings, that is, the rolling elements use hot-pressed or hot-isostatically pressed Si3N4 ceramic balls, and the bearing rings are still steel rings. This kind of bearing has a high degree of standardization, low price, small changes to the machine tool, easy maintenance, and is 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 otherwise surface treated. There is no certain order or rule for selecting bearings. The conditions, performance and most relevant matters required for the bearing should be considered first, which is especially practical. Rolling bearings are precision components and their use must be handled with corresponding caution. No matter how high-performance bearings are used, if used improperly, the expected high performance will not be achieved. Precautions regarding the use of bearings are as follows. a. Keep the bearing and its surroundings clean. Even small dust invisible to the eye can have a bad impact on bearings. Therefore, it is necessary to keep the surrounding area clean so that dust does not invade the bearing. ​ b. Use with caution. If the bearing is subjected to strong impact during use, scars and indentations will occur, which may cause accidents. In severe cases, cracks and breaks may occur, so care must be taken. ​ c. Use appropriate operating tools. Avoid replacing existing tools and use appropriate tools. ​ d. Pay attention to the corrosion of bearings. When operating bearings, sweat on your hands can cause rust. Be sure to use clean hands and wear gloves if possible. In order to maintain the original performance of the bearing in good condition for as long as possible, it is necessary to maintain and repair it to prevent accidents before they occur, ensure the reliability of operation, and improve productivity and economy.  

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