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Cleaning maintenance and damage analysis of deep groove ball bearing

wallpapers Environment 2021-05-08
First, some equipment require the clearance of Timken bearing very strictly when using it. If the clearance is too large, even if it is a little larger, it will easily wear the parts of the equipment. So we have to reduce the clearance to solve this problem, but another problem arises with it. That is, if the clearance is too small, the problem of heat dissipation, If the heat dissipation is not correct, it will easily cause the internal temperature to rise and eventually cause the bearing to overheat and burn!
 
The second is the excessive load (too much preload). The speed is too high. The clearance is too small. There is water or other foreign material intrusion. If both of the above are not, the accuracy of the shaft and bearing box is poor and the deflection of the shaft is large. Seeing this, I think everyone wants to know the solution. First, we should study the lubricant and lubrication method, select the lubricant for Timken deep groove ball bearing and its dosage, and correct the choice of bearing. The research should be carried out to fit, bearing clearance and preload, and improve the sealing device. Check the accuracy of the shaft and bearing housing. Of course, if you have an expert next to you, let him operate you follow the best!
 
1. Cleaning of bearings
 
When removing the lower bearing for maintenance, record the appearance of deep groove ball bearing first, confirm the remaining lubricant quantity, and wash the bearing after sampling and checking the lubricant. As a cleaning agent, gasoline and kerosene are commonly used.
 
The cleaned bearings are divided into coarse cleaning and fine cleaning. In the container, the metal mesh is placed at the bottom to prevent the bearing from contacting the container dirt directly. When cleaning, if the bearing is rotated with dirt, it will damage the rolling surface of the bearing, so it should be noted. In the crude cleaning oil, use brush to remove grease and adhesive, and after cleaning, turn to fine cleaning.
 
Fine cleaning is to rotate the deep groove ball bearing in the cleaning oil and carefully clean it. In addition, the cleaning oil should be kept clean frequently.
 
2. Maintenance and judgment of bearings
 
In order to determine whether the disassembled bearing can be reused, it is necessary to check after the bearing is cleaned, and carefully check the condition of raceway surface, rolling surface, mating surface, wear of cage, increase of bearing clearance and whether there is any damage or abnormality about the decrease of dimension accuracy. For non separated ball bearings, support the inner ring horizontally with one hand and rotate the outer ring to confirm whether it is smooth.
 
Tapered roller bearings can be divided into separate bearings, which can be checked respectively for the raceway surface of rolling body and outer ring.
 
Large bearing can not be rotated by hand. Pay attention to the appearance of rolling body, raceway, cage and edge guard surface. The higher the importance of bearings, the more careful inspection is required.
 
The judgment of whether it can be reused is determined by considering the damage degree, mechanical performance, importance, operation conditions and the next overhaul period of deep groove ball bearing. However, if the following defects are found, they cannot be used again, and new bearings must be replaced:
 
(a) There is crack or notch on any one of inner ring, outer ring, rolling body and cage;
 
(b) There is fracture on any one of the ferrule and rolling body;
 
(c) There are significant scratches on the raceway surface, edge guard and rolling body;
 
(d) The holder is worn significantly, or the rivets are obviously loose;
 
(e) There are rust and injury on the raceway surface and rolling body;
 
(f) There are serious indentation and marks on the raceway surface and rolling body;
 
(g) The inner diameter surface or outer diameter surface of inner ring has obvious creep;
 
(h) The discoloration caused by heat is obvious;
 
(i) The bearing, sealing ring or dust cover sealed with grease is damaged obviously.
 
The internal factors mainly refer to the three factors that determine the bearing quality, such as structural design, manufacturing technology and material quality. The metallurgical quality of deep groove ball bearing materials was once the main factor that affected the early failure of Timken bearing. With the development of Metallurgical Technology (such as vacuum degassing of bearing steel), the quality of raw materials has been improved. The proportion of raw material quality factor in bearing failure analysis has decreased obviously, but it is still one of the main factors affecting the failure of deep groove ball bearing. The proper selection of material is still a factor that must be considered in bearing failure analysis.
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