Timken bearing fault characteristics show severe faults (usually, such as bearing damage, burns, sand cracking, raceways, beading, etc.) no more than a week old, equipment, larger capacity, faster, shorter Interval. Therefore, the actual bearing fault diagnosis, once the fault is discovered, its advanced function, should determine the fault of the spherical roller bearing decisively and repair as soon as possible.
1. Selection and control of shaft and bearing chamber tolerance: After the bearing is pressed into the timken 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 spherical roller 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. Spherical roller bearings should have a special mold when assembling, can not be beaten at will, only a small circle of force when pressing the shaft, only a large circle when pressing the large circle. Air pressure or hydraulic pressure is required for assembly. When pressing, the upper and lower molds should be outside the horizontal state. If tilted, the timken 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 roller is in the centering roller. It is easy to enter the timken bearing along the shaft as the bearing rotates. 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 acidic substance volatilized by the insulating paint forming a corrosive substance under a certain temperature and humidity, which causes the tunken bearing channel to corrode and causes the spherical roller bearing to be damaged. The problem can only be achieved by selecting a good insulating varnish and venting it after drying for a while.
What we should cause is the performance of the bearing components in this flaw and other countries' vigilance, the failure is often very fast and very sudden. It is considered to be an example of measuring the rotor shaft end after two hours.
In the diagnosis of these counterfeit bearing faults, we should focus on high-quality timken bearings usually in the time domain spectrum and vibration conditions of the device, such events in the abnormal spectrum accumulation is normal, in order to determine in time when the spherical roller bearing failure, avoid equipment accident.https://www.supplyforever.com/
