How to detect imported bearing failure

Correct use of imported bearings can achieve fatigue life. However, if an accidental early injury occurs, it can no longer be used normally. Unlike fatigue life, this early damage is called a failure or accident. Most of them are caused by poor considerations in installation, use, and lubrication, foreign objects that have intruded from the outside, or insufficient research on shafts and housings.

The cause of bearing damage may be insufficient lubricant, improper grade, defective oil supply and drainage structure, foreign material intrusion, installation error of the bearing, or excessive deflection of the shaft. It may also be due to the above causes.

When the bearing is used for a period of time, the inner ring, body, cage, outer ring, raceway, etc. of the bearing will cause certain defects, the bearing of the bearing will be badly damaged due to scars, and the bearing will generate heat and prolonged heating will result in: (1 ) Dilution of bearing lubricating oil. (2) Accelerate the fatigue of the material and decrease the hardness. Due to the above reasons, a vicious circle is further formed, accelerating the overheating and burning the bearing. Severely, the inner ring of the imported bearing is distorted. Therefore, when running on the line, if you find that the bearing has serious heat, smoke, do not stop, but should keep running to the front of the station, because at this moment the bearing is in a molten state, and once it is stopped and cooled, it can no longer walk and block the line.

It is very important for the maintenance of the oil bearing of the locomotive bearing, especially the proper amount of refueling for the imported bearing can guarantee the good lubrication of the bearing. The lack of oil and too much refueling can easily lead to the bearing failure. The addition of less oil can easily lead to poor lubrication of the bearing. The addition of heat can also cause overheating of the mixing. Therefore, it is important to maintain proper oil supply during the maintenance process. At the same time, it is also very important to clean the grease of the bearing. Once the grease has fallen into other impurities and moisture, it will affect the normal clearance and Establish the necessary oil film.

The use of the bearing for a long time exceeds the service life of the bearing and can easily cause the fatigue of the material. It also causes the material to be deformed due to the strong impact. The roller and the raceway surface are peeled off. Big.

The mismatching clearance of the inner ring of the bearing and the shaft is inconsistent with the clearance. It is also very easy to cause bearing failure. The large amount of interference can easily cause the inner ring of the bearing to crack due to excessive tensile stress. The small amount of interference is also very easy to cause. The bearing inner ring "relaxed."

Improper fit of the imported bearing assembly with clearance is also likely to cause bearing failure. Small clearance is very easy to cause friction and heating of the roller and raceway. With increasing temperature, the bearing inner ring, body, cage, outer ring, end cap The temperature is not the same, there is a temperature difference between each other, and therefore the amount of expansion is also slightly different, which also results in a further reduction of the fit clearance and increases the heat generated by the bearing. If the clearance is too large, the vibration of the roller increases, and the impact of the roller and the raceway is increased. At the same time, the internal load distribution is uneven, the load roller is reduced, and the central roller load is excessive.

When assembling the bearing, the copper bearing was not used to impact the bearing and cause the holder to deform due to the impact of the process. Incorrect installation of the inner and outer rings of the traction motor bearing or other reasons caused the axial traverse moment to disappear, causing the bearing shaft to become crushed.

Therefore, we must fully understand the use of bearings on the basis of the machine, working conditions and its peripheral structure to find out the situation before and after the occurrence of failure, combined with the damage of imported bearings and a variety of related reasons for analysis, can prevent similar failures again.