Timken bearing fault features show that when serious faults (usually, such as bearing damage, burn, sand frame crack, raceway, bead piercing, etc.) are no more than one week old, the equipment has larger capacity, faster speed and shorter time interval.
Therefore, in the actual bearing fault diagnosis, once the fault is found, its advanced function should decisively determine the fault of self-aligning roller bearing and repair it as soon as possible.
1. Selection and control of tolerance of shaft and bearing chamber: the bearing shall rotate flexibly without blocking feeling after being pressed into Timken bearing. If there is obvious inflexible rotation, it indicates that the size of the shaft is too large and the tolerance should be reduced.
If the self-aligning roller bearing rotates by hand after being pressed into the shaft, it may be that the tolerance of the shaft is too large or the roundness of the shaft is not good.
Therefore, when controlling the tolerance of shaft and bearing Self-Aligning Roller Bearing chamber, it is also necessary to control the roundness. At present, many domestic manufacturers only control the tolerance, not the roundness.
2. Bearing assembly method: because the bearing is a high-precision product, if it is not assembled properly, it is easy to damage the bearing channel and lead to bearing damage.
The self-aligning roller bearing shall be equipped with a special mold during assembly, and can not be knocked at will. When pressing into the shaft, only the small ring can be stressed, and when pressing the large ring, only the large ring can be stressed. Pneumatic or hydraulic pressure is required during assembly.
During press assembly, the upper and lower dies shall be outside the horizontal state. If there is Self-Aligning Roller Bearing inclination, the Timken bearing channel will be damaged due to stress and the bearing will make a guide sound.
when the bearing is installed on the rotor for dynamic balance, it is easy to enter the iron filings generated during dynamic balance into the Self-Aligning Roller Bearing bearing, so it is necessary to perform dynamic balance before installing the bearing.
In order to facilitate assembly, some manufacturers apply some oil or grease in the bearing chamber for lubrication effect during assembly, but it is often difficult for operators to control the amount. If more oil or grease is accumulated in the bearing chamber,
it is easy to enter Timken bearing along the shaft when the self-aligning roller bearing rotates. The bearing chamber shall not be coated with oil or grease. If it must be coated, it shall be controlled and there shall be no accumulation in the bearing chamber.
4. Prevention of paint rust: paint rust is often found in sealed motors. The sound of the motor is very good during assembly, but after being placed in the warehouse for some time, the abnormal noise of the motor becomes very large, and there is serious rust when removing the bearing.
In the past, many manufacturers thought it was the bearing problem. After our continuous publicity, now the motor factory has realized that the main problem is the insulating paint. This problem is mainly because the acidic substances volatilized from the insulating paint form corrosive substances at a certain temperature and humidity,
which corrodes the Timken bearing channel and leads to the damage of the self-aligning roller bearing. At present, the problem can only be to select good insulating paint and assemble after drying and ventilation for a period of time.
We should arouse our vigilance in this defect and other countries. The performance of bearing components, 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 fault diagnosis of these fake bearings, we should pay attention to the high-quality Timken bearings.
Usually, under the time-domain spectrum and vibration conditions of the equipment, this kind of event is normal in the abnormal spectrum accumulation, so as to timely determine when the self-aligning roller bearing fails and avoid equipment accidents.