Writer: Eric Bearing Limited
First of all, some equipments have very strict requirements on their own clearance problems when using TIMKEN bearings. If the clearance is too large, even if it is slightly larger, it will easily wear out the parts of the equipment. Clearance to solve this problem, but then another problem arises, that is, if the clearance is too small, the problem of heat dissipation, if the heat dissipation is improper, it will easily cause the internal temperature to rise and eventually cause the bearing to overheat and burn!
The second may be excessive load (excessive preload). The speed is too large. The play is too small. Water or other foreign objects invaded. If neither of the above two cases is true, then the shaft and bearing housing have poor accuracy and the shaft has a large deflection. Seeing this, I think everyone would like to know the solution. First of all, we must study the lubricant and lubrication method, choose the TIMKEN deep groove ball bearing lubricant, and its amount, and we must correct the choice of bearing. Research should be to match, bearing clearance and preload, and improve the sealing device.
Check the accuracy of the shaft and bearing housing. Of course, if there is an expert next to you, let him operate you and learn best !
1. Cleaning of bearings
When disassembling the bearing for maintenance, first record the appearance of the deep groove ball bearing, confirm the remaining amount of lubricant, and after sampling the lubricant for inspection, wash the bearing. As a cleaning agent, gasoline and kerosene are generally used.
The cleaning of the disassembled bearings is divided into coarse cleaning and fine fine cleaning. Put them in the container first, and put the bottom of the metal mesh pad first so that the bearings do not directly contact the dirt of 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 adhesions. After it is roughly clean, transfer to fine washing.
Fine washing is to carefully wash the deep groove ball bearings while rotating in the cleaning oil. In addition, the cleaning oil should also be kept clean.
2. Maintenance and judgment of bearings
In order to judge whether the dismantled bearing can be used again, it should be checked after the bearing is cleaned, and the state of the raceway surface, rolling surface, and mating surface, the wear of the cage, the increase of the bearing clearance and the dimensional accuracy are carefully checked. Falling damage, abnormalities. 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.
Separate bearings such as tapered roller bearings can be inspected separately for the rolling elements and the raceway surfaces of the outer ring.
Because large bearings cannot be rotated by hand, pay attention to check the appearance of rolling elements, raceways, cages, rib surfaces, etc. 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 of deep groove ball bearings, mechanical properties, importance, operating conditions, and the period until the next inspection. However, if the following defects cannot be used any more, new bearings must be replaced:
(1) Any one of the inner ring, outer ring, rolling element and cage has cracks or notches;
(2) Any one of the ferrule and rolling element is broken;
(3) There are obvious stuck injuries on the raceway surface, ribs and rolling elements;
(4) The wear of the cage is significant, or the rivets are significantly loose;
(5) Rust and injury on the raceway surface and rolling body;
(6) There are serious indentations and scratches on the raceway surface and rolling body;
(7) There is obvious creep on the inner diameter surface of the inner ring or the outer diameter surface of the outer ring;
(8) Discoloration caused by heat is obvious;
(9) For bearings sealed with grease, the seal ring or dust cover is obviously damaged.
The internal factors mainly refer to the three major factors that determine the bearing quality, such as structural design, manufacturing process and material quality. The metallurgical quality of deep groove ball bearing materials used to be the main factor affecting the early failure of TIMKEN bearings. With the advancement of metallurgical technology (such as vacuum degassing of bearing steel, etc.), the quality of raw materials has been improved. The proportion of raw material quality factors in bearing failure analysis has decreased significantly, but it is still one of the main factors affecting the failure of deep groove ball bearings.
Proper material selection is still a factor that must be considered in bearing failure analysis.
The use of grease plays an important role in the maintenance of TIMKEN bearing noise , if you are looking for TIMKEN Bearings , pls do free to contact me .
The grease used in the TIMKEN bearing must have anti-rust effect. The anti-rust agent is preferably insoluble in water. Grease should have good adhesion and can form an oil film on the surface of steel. Grease will become soft during mechanical processing, resulting in leakage. During normal operation, grease will be thrown from the bearing seat into the spherical ball bearing with seat. If the mechanical stability of the grease is not enough, the structure of the soap of the grease will be mechanically disintegrated during operation, causing the grease to be destroyed, thus losing the lubricating effect.
If the grease is wrongly selected, all measures to prevent TIMKEN bearings will be in vain. It is important to choose a grease whose base oil viscosity can provide a sufficient lubricating effect at the working temperature. The viscosity is mainly affected by the temperature. The temperature rises while the temperature rises.
Therefore, the viscosity of the base oil at operating temperature must be known. Machinery manufacturers usually specify the use of certain greases, but most standard greases are suitable for a wide range.
In the process of using seated spherical ball bearings, grease is very critical. If the modified grease is used, it will not only fail to play its due role, but also damage the TIMKEN bearing.
The vibration of the TIMKEN bearing has a significant effect on the failure of the bearing. For example: peeling, indentation, corrosion, cracks, wear, etc. will be reflected in the bearing vibration detection. So by using special bearing vibration measurement devices (frequency analyzer and vibrometer, etc.) ) The magnitude of the vibration can be measured. The frequency distribution can be used to infer the details of the abnormal vibration. The measured values are different due to the use premise of the bearing or the installation position of the sensor. Therefore, it is necessary to analyze and compare the measured values of each machine in advance to determine and judge. scale.
At present, the equipment using fine bearings is becoming more and more refined, and the grease used in the bearings must have the following functions:
(1) With the same operating life as the bearing, the maintenance cycle should be delayed as much as possible, the downtime should be shortened, and the labor productivity can be improved.
(2) At a high speed of dn>5×105, it is necessary to ensure that the temperature rise of the motor is low and oil is not dumped, thereby reducing power consumption and protecting the motor.
(3) Its scalar content control is under the inevitable standard, and the pollution of the equipment noise to the situation is minimized.
(4) Under the premise of ultra-low temperature work, it guarantees the flexibility of starting and running of bearings, and common problems of bearings. Guaranteed minimum output power.
The cleaned TIMKEN bearings are divided into coarse cleaning and fine cleaning, and put them in the container separately. Put the bottom of the metal mesh pad first so that the bearing does not directly contact the dirt of the container. During rough cleaning, if the bearing is rotated with dirt, it will damage the rolling surface of the bearing, and it should be noted. In the coarse cleaning oil, use a brush to remove smooth grease and adhesions. After roughly cleaning, transfer to fine washing.