Damage Repair Countermeasures And Maintenance Methods Of FAG Spherical Roller Bearings

Cleaning of bearings
When disassembling the spherical roller bearing for maintenance, first record the appearance of the FAG bearing, confirm the remaining amount of lubricant, and then wash the bearing after sampling the lubricant for inspection. As cleaning agents, gasoline and kerosene are generally used.
The cleaning of the disassembled bearings is divided into coarse cleaning and fine cleaning. They are placed in the container respectively. First, put a metal mesh pad on the bottom so that the FAG bearing does not directly contact the dirt in the container. During rough cleaning, if the bearing is rotated with dirt, it will damage the rolling surface of the bearing, so care should be taken. In the coarse cleaning oil, use a brush to remove grease and sticky matter. After it is roughly clean, switch to fine cleaning.
Fine cleaning is to carefully clean the spherical roller bearing while rotating it in the cleaning oil. In addition, the cleaning oil should also be kept clean frequently.Bearing maintenance and judgment
In order to judge whether the disassembled spherical roller bearing can be reused, it is necessary to check after the bearing is cleaned, and carefully check the condition of the raceway surface, rolling surface, mating surface, wear of the cage, increase in clearance of the FAG bearing and Are there any damages or abnormalities related to reduced dimensional accuracy? For non-separable small ball bearings, use one hand to support the inner ring horizontally and rotate the outer ring to confirm whether it is smooth.
For separate bearings such as spherical roller bearings, the rolling elements and raceway surfaces of the outer ring can be inspected separately.
Because large bearings cannot be rotated by hand, pay attention to the appearance of rolling elements, raceways, cages, ribs, etc. The higher the importance of FAG bearings, the more careful inspections are required.
The judgment of whether the bearing can be reused is determined by considering the degree of bearing damage, mechanical performance, importance, operating conditions, and the period until the next maintenance. However, if it has the following defects, it can no longer be used and must be replaced with a new spherical roller bearing:
(a) There are cracks or gaps in any of the inner ring, outer ring, rolling elements, and cage;
(b) There is a break in any of the ferrules and rolling elements;
(c) There are obvious jams on the raceway surface, ribs, and rolling elements;
(d) The cage is significantly worn or the rivets are significantly loose;
(e) There is rust or damage on the raceway surface and rolling elements;
(f) There are serious indentations and scratches on the raceway surface and rolling elements;
(g) There is obvious creep on the inner diameter surface of the inner ring or the outer diameter surface of the outer ring;
(h) Discoloration caused by heat is obvious;
(i) Bearings filled with grease have obvious damage to seals or dust covers.
If there is no wrong selection and it can be used correctly, the FAG bearing can be used for a long time before the end of its life. In this case, the general damage state of the spherical roller bearing is peeling. On the other hand, there is also early damage caused by accidental early damage and failure to withstand use.
Specific reasons include insufficient consideration in use and lubrication, foreign matter intrusion, bearing assembly errors, large deflection of the shaft, insufficient research on the shaft and bearing box, etc. It can be said that these reasons overlap with each other in many cases. Therefore, we recommend that you select the size of the bearing based on the life formula of the FAG bearing, and on the basis of fully understanding the machine used for the spherical roller bearing, the usage conditions, and the peripheral structure of the bearing. If you can clarify the conditions before and after the accident, Combined with the inspection of bearing damage and various causes, we can prevent similar accidents from happening again.