Thrust ball bearing fault characteristics show severe faults (usually, such as bearing damage, burns, sand cracking, raceways, beading, etc.) no more than a week old, equipment, capacity is larger, faster, and more Short time interval. Therefore, the actual FAG bearing fault diagnosis, once the fault is discovered, its advanced function, should determine the bearing fault decisively and repair as soon as possible.
1. Selection and control of shaft and bearing chamber tolerance: After the bearing is pressed into the thrust ball bearing, it should be flexible and unobstructed. If the obvious rotation is not flexible, it means that the size of the shaft is too large and the tolerance is lowered. If the bearing is pressed into the shaft and turned by hand, there is a clear "sand" feeling, which may be that the tolerance of the shaft is too large or the roundness of the shaft is not good. Therefore, it is necessary to control the roundness when controlling the tolerance of the shaft and the bearing chamber. At present, many domestic manufacturers only control the tolerance and do not control the roundness.
2, the assembly of the bearing: Because the bearing is a high-precision product, such as improper assembly can easily damage the bearing channel, resulting in bearing damage. The FAG bearing should have a special mold during assembly. It can't be beaten at will. When pressing the shaft, it can only be pressed in a small circle. When pressing a large circle, it can only be subjected to a large circle. Air pressure or hydraulic pressure is required for assembly. The upper and lower molds should be outside the horizontal state during press-fit. If tilted, the thrust ball bearing channel will be damaged due to the force, which will cause the bearing to produce a sound.
3. Prevention of assembly of foreign objects: When the bearing is mounted on the rotor to make dynamic balance, it is easy to enter the iron filings generated during dynamic balancing into the bearing. Therefore, it is better to balance the load before loading the bearing. Some manufacturers have some oil or grease to lubricate the bearing chamber during assembly. However, it is often difficult for the operator to control the amount. If the oil or grease accumulates in the bearing chamber, the FAG bearing rotates. It is easy to enter the inside of the thrust ball bearing along the shaft. It is best not to apply oil or grease to the bearing chamber. If it is not painted, it must be controlled not to accumulate in the bearing chamber.
4, the prevention of paint rust: paint rust is characterized by multiple seals in the motor, the motor sounds very good when assembled, but after putting some time in the warehouse, the motor noise is very large, the bearing is removed Severe rust. In the past, many manufacturers thought that it was a bearing problem. After our constant publicity, the motor factory has now realized that it is mainly a problem of insulating varnish. This problem is mainly caused by the fact that the acidic substance volatilized by the insulating paint forms a corrosive substance under a certain temperature and humidity, and the bearing of the thrust ball bearing is corroded and causes the bearing to be damaged. The problem can only be achieved by selecting a good insulating varnish and venting it after drying for a while.
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