Lubrication method for improving the friction of German INA bearing friction
General work INA bearings use lean grease and oil mist lubrication. These lubrication methods have their own characteristics, but to meet the working requirements of modern high-speed, high-load work roll bearings, it can be considered that oil vapor lubrication is more suitable.
Lubrication has an important influence on the fatigue life of INA bearings and friction, wear, temperature, vibration, etc. The nine excellent features of ceramic bearings do not have normal lubrication, and the bearings cannot work. Analysis of the cause of bearing damage indicates that about 40% of bearing damage is associated with poor lubrication. Therefore, good lubrication of INA bearings is an effective measure to reduce bearing friction and wear. In addition, the lubrication of the bearing also has various functions such as heat dissipation, rust prevention, sealing, and mitigation of impact.
After oil-gas lubrication, the service life of the work roll bearing has been significantly improved, and the wear and damage of the rolling work surface is improved compared with the grease lubrication. When the bearing reaches 1/3-1/4 of its service life, it must be thoroughly cleaned and the internal clearance of the INA bearing measured. When the internal clearance of the bearing is greater than twice the original clearance, it should be adjusted, after cleaning and When the bearing after inspection is reinstalled, the loaded area should be replaced (ie, the outer ring is rotated 90 degrees and then matched with the bearing seat)
Under the conditions of high speed and high temperature, the adjustment scheme of the INA combination position and clearance can be oil lubricated when the grease lubrication is not suitable. A large amount of heat can be taken away by the circulation of the lubricating oil. Viscosity is an important characteristic of lubricating oil. The viscosity directly affects the fluidity of the lubricating oil and the thickness of the oil film formed between the friction surfaces. The viscosity of the lubricating oil at the working temperature of the bearing is generally 12-15 cst. The higher the speed, the lower the viscosity, and the heavier the load, the higher the viscosity. Commonly used lubricating oils include mechanical oil, high-speed mechanical oil, turbine oil, compressor oil, transformer oil, cylinder oil, and the like.
The INA bearing has increased internal clearance of the bearing due to wear during operation. An increase in the clearance of the bearing causes unfavorable factors such as a reduction in the load bearing area and an increase in running noise. Therefore, when considering the re-use criteria for bearing clearance, it is first necessary to increase the clearance-bearing bearing depending on the operating conditions of the main engine.https://www.supplyforever.com/
TIMKEN bearing damage analysis and preventive measures
There are many reasons for the damage of the bearing. Only after familiarizing with the cause of the damage of the TIMKEN bearing can the corresponding preventive measures be taken:
(1) Selection and control of shaft and bearing tolerances of TIMKEN bearings: After the bearing is pressed into the TIMKEN bearing, it should be flexible and unobstructed. If the obvious rotation is not flexible, it means that the size of the shaft is too large and the tolerance is lowered. If the spherical roller bearing is pressed into the shaft and turned by hand, there is a clear "sand" feeling, which may be that the tolerance of the shaft is too large or the roundness of the shaft is not good. Therefore, the roundness should also be controlled when controlling the shaft and bearing chamber tolerances.
(2) Bearing assembly method: Because the bearing is a high-precision product, if the assembly is improper, it is easy to damage the bearing channel, resulting in bearing damage. Spherical roller bearings should have a special mold when assembling, can not be beaten at will, only a small circle of force when pressing the shaft, only a large circle when pressing the large circle. Air pressure or hydraulic pressure is required for assembly. The upper and lower molds should be outside the horizontal state during press-fit. If tilted, the TIMKEN bearing channel will be damaged due to the force, which will cause the bearing to produce a sound. TIMKEN bearing damage analysis and preventive measures method Timken bearing distributor.
(3) Prevention of paint rust: The characteristic of paint rust is that it is often in a sealed motor. The sound of the motor is very good when assembled. However, after some time is put in the warehouse, the abnormal noise of the motor becomes very large, and the bearing is removed. There is severe rust. The main problem is that the acidic substance volatilized by the insulating paint forms a corrosive substance under a certain temperature and humidity, and the TIMKEN bearing channel is corroded, which causes the spherical roller bearing to be damaged. The problem can only be achieved by selecting a good insulating varnish and venting it after drying for a while.
(1) Selection and control of shaft and bearing tolerances of TIMKEN bearings: After the bearing is pressed into the TIMKEN bearing, it should be flexible and unobstructed. If the obvious rotation is not flexible, it means that the size of the shaft is too large and the tolerance is lowered. If the spherical roller bearing is pressed into the shaft and turned by hand, there is a clear "sand" feeling, which may be that the tolerance of the shaft is too large or the roundness of the shaft is not good. Therefore, the roundness should also be controlled when controlling the shaft and bearing chamber tolerances.
(2) Bearing assembly method: Because the bearing is a high-precision product, if the assembly is improper, it is easy to damage the bearing channel, resulting in bearing damage. Spherical roller bearings should have a special mold when assembling, can not be beaten at will, only a small circle of force when pressing the shaft, only a large circle when pressing the large circle. Air pressure or hydraulic pressure is required for assembly. The upper and lower molds should be outside the horizontal state during press-fit. If tilted, the TIMKEN bearing channel will be damaged due to the force, which will cause the bearing to produce a sound. TIMKEN bearing damage analysis and preventive measures method Timken bearing distributor.
(3) Prevention of paint rust: The characteristic of paint rust is that it is often in a sealed motor. The sound of the motor is very good when assembled. However, after some time is put in the warehouse, the abnormal noise of the motor becomes very large, and the bearing is removed. There is severe rust. The main problem is that the acidic substance volatilized by the insulating paint forms a corrosive substance under a certain temperature and humidity, and the TIMKEN bearing channel is corroded, which causes the spherical roller bearing to be damaged. The problem can only be achieved by selecting a good insulating varnish and venting it after drying for a while.
订阅：
评论 (Atom)