How long a high-speed spindle bearing can last is usually determined by factors such as bearing performance and wear resistance. If there are the following defects, it can no longer be used, and the bearings must be replaced. If any one of the outer ring, inner ring, rolling element and cage has cracks or nicks, it cannot be used. Wear failure is one of the common failure modes of various bearings. According to the damage method, it can be divided into the most common abrasive particle damage and adhesive wear. We can distinguish whether the bearing has reached wear failure according to the following technical means. 1. Technical characteristics of oil film resistance diagnosis: A standard detection can be performed for various environments, and the actual effect of abnormal diagnosis of surface peeling, embossing, cracks, etc. is poor. Application scope of high-speed spindle bearings: suitable for places where the rotating shaft is exposed. 2. Technical characteristics of vibration diagnosis: the key technology of vibration diagnosis is widely used; online diagnosis can be completed; the diagnosis speed is relatively fast, and the diagnosis results are also very perfect. Application scope of high-speed spindle bearings: It is especially suitable for common fault detection of high-speed spindle bearings in rotating machinery. 3. Features of ferrography diagnosis technology: the equipment does not need to solve problems; the project investment is low, and the effect is very good; the initial fatigue failure of oil-free bearings can be found; the damage principle can be scientifically researched. Application scope of high-speed spindle bearings: It is suitable for common fault diagnosis of grease lubricated bearings, but it is more difficult for grease lubricated bearings. 4. Technical characteristics of temperature diagnosis: simple diagnosis; good effect in distinguishing bearing burns. Application scope of high-speed spindle bearings: simple and basic diagnosis of bearings in equipment. 5. Features of optical fiber detection and diagnosis technology: relatively high sensitivity; frequency stability; immediate feedback of bearing manufacturing quality, surface damage level, load, lubrication and clearance conditions. High-speed spindle bearing application area: suitable for equipment that can install the sensor in the bearing seat. 6. Technical characteristics of acoustic emission diagnosis: fast speed, simple operation; support online detection. Application scope of high-speed spindle bearings: The application of new technologies that have developed in recent years is rarely used in the detection of working conditions of high-speed spindle bearings. High-speed spindle bearing, accurate torque, can rotate stably!