How to extend the service life of bearing?
Bearings are important parts in mechanical equipment. In order to ensure the best performance of bearings, reliable work, correct installation and operation, and reasonable maintenance are very important. Today HONB shares several tips for extending bearing life. HONBbearing02
First, lubrication is key
First, lubrication is key
Choose the right lubrication system and high-quality lubricant. The lubricating oil film separates the surfaces of the oil film that are in contact with each other and provides the necessary protection against corrosion and wear. Therefore, for all rotating or reciprocating parts, especially bearings and gears, the lubricating oil film is not available for normal operation. lack. In the case of splash lubrication or circulating lubrication systems, the oil film can also transfer heat.
Plants often suffer from unnecessary shutdowns and deteriorating equipment due to improper lubrication. Insufficient oil supply can cause increased wear and temperature rise, resulting in excessive wear and / or early bearing failure and damage. Excessive lubrication, especially for high-speed equipment, will generate excessive heat due to oil agitation, chemical degradation of the lubricant, and damage to the bearings.
Plants often suffer from unnecessary shutdowns and deteriorating equipment due to improper lubrication. Insufficient oil supply can cause increased wear and temperature rise, resulting in excessive wear and / or early bearing failure and damage. Excessive lubrication, especially for high-speed equipment, will generate excessive heat due to oil agitation, chemical degradation of the lubricant, and damage to the bearings.
Correct lubrication and regular maintenance can avoid bearing damage caused by lubrication problems. To ensure proper lubrication:
1.Follow the usage guidelines set by the equipment manufacturer for each device;
2.When adding grease, it should be charged between the bearing rolling parts and the housing (or retainer) to ensure that a sufficient amount of grease enters and the key raceway surfaces are fully lubricated;
3.Should pay attention to when the bearing should be greased;
4.Monitoring equipment’s indicators to detect early signs of problems, such as temperature fluctuations and / or abnormally high temperatures;
5.Pay attention to equipment noise or abnormal vibration;
6.Observe lubricant leakage;
7.Sampling lubricants regularly and checking for contamination.
Secondly, reasonable adjustment is very important
During assembly or installation, if the internal clearance of the bearing is too large or too small, or in some cases, the preload is too high, which may cause early damage and shorten the bearing life. In addition to causing downtime and costly maintenance, improper bearing assembly and installation may have more negative effects, such as affecting the operation of other parts and shortening their service life.
Assembly, installation and regular maintenance according to the equipment manufacturer’s instruction manual are the best way to prevent problems. If time is tight, you can push the adjustment device forward or remove the gasket to correct the overly loose tapered rolling bearing set.
Assembly, installation and regular maintenance according to the equipment manufacturer’s instruction manual are the best way to prevent problems. If time is tight, you can push the adjustment device forward or remove the gasket to correct the overly loose tapered rolling bearing set.
On the other hand, the adjustment of the bearing is too tight, which may cause overheating damage and the bearing must be replaced. The process of assembling and installing bearings must be accurate, repeatable, and verifiable after installation. In addition, other part parameters must be considered to optimize system performance.
In addition, use equipment in accordance with OEM requirements and set appropriate predictive maintenance items such as monitoring of lubricating oil or grease, which should include root cause analysis of the failure. In this way, even the problematic equipment can have a much longer uptime.
If this type of bearing is not qualified after inspection and the radial assembly clearance is too small, it means that the bearing’s fitting selection is improper or the assembly part is not processed correctly. At this time, the bearing must be removed, the cause must be found out, and the bearing must be removed and reinstalled. Of course, bearing clearance is not enough.
If this type of bearing is not qualified after inspection and the radial assembly clearance is too small, it means that the bearing’s fitting selection is improper or the assembly part is not processed correctly. At this time, the bearing must be removed, the cause must be found out, and the bearing must be removed and reinstalled. Of course, bearing clearance is not enough.
3.Check the tightness between the bearing and the shoulder
Under normal circumstances, bearings with tight fit interference installation must be against the shoulder of the shaft. Testing method:
Light inspection method. That is, the electric light is directed at the bearing and the shaft shoulder, and the light leakage is judged. If there is no light leakage, it means that the installation is correct; if there is even light leakage around the shaft shoulder, it means that the bearing is not tight against the shaft shoulder, and the pressure should be applied to the bearing to make it tight; if there is some light leakage, it means that the bearing is installed tilted, and a hand hammer or copper rod Or the sleeve hits the bearing inner ring and slowly settles.
Thickness gauge inspection method. The thickness of the thickness gauge should start from 0.03mm. During the test, try to insert a few points on the bearing’s inner ring end face and the entire circumference of the shoulder. If there is a gap and it is very uniform, it means that the bearing is not in place. The pressure is not tight, which means that the fillet of the journal fillet is too large, and the bearing is stuck. The journal fillet should be trimmed to make it smaller; Passed, indicating that it must be disassembled, trimmed, and reinstalled at this time.
Light inspection method. That is, the electric light is directed at the bearing and the shaft shoulder, and the light leakage is judged. If there is no light leakage, it means that the installation is correct; if there is even light leakage around the shaft shoulder, it means that the bearing is not tight against the shaft shoulder, and the pressure should be applied to the bearing to make it tight; if there is some light leakage, it means that the bearing is installed tilted, and a hand hammer or copper rod Or the sleeve hits the bearing inner ring and slowly settles.
Thickness gauge inspection method. The thickness of the thickness gauge should start from 0.03mm. During the test, try to insert a few points on the bearing’s inner ring end face and the entire circumference of the shoulder. If there is a gap and it is very uniform, it means that the bearing is not in place. The pressure is not tight, which means that the fillet of the journal fillet is too large, and the bearing is stuck. The journal fillet should be trimmed to make it smaller; Passed, indicating that it must be disassembled, trimmed, and reinstalled at this time.
4. Inspection after installation of thrust bearings
When installing thrust bearings, check the perpendicularity of the shaft washer and the shaft centerline. The method is to fix the dial indicator on the end face of the case, and turn the bearing of the contact on the bearing ring raceway while watching the pointer of the dial indicator. If the pointer is deflected, the shaft ring and the centerline of the shaft are not perpendicular. When the case shell hole is deep, you can also use the extended micrometer head to check.
When the thrust bearing is installed correctly, its seat ring can automatically adapt to the rolling of the rolling element to ensure that the rolling element is located on the upper and lower ring raceways. If the installation is reversed, not only will the bearings not work properly, but the mating surfaces will be severely worn. Since the difference between the shaft ring and the seat ring is not obvious, you should take extra care during assembly and do not make mistakes.
When the thrust bearing is installed correctly, its seat ring can automatically adapt to the rolling of the rolling element to ensure that the rolling element is located on the upper and lower ring raceways. If the installation is reversed, not only will the bearings not work properly, but the mating surfaces will be severely worn. Since the difference between the shaft ring and the seat ring is not obvious, you should take extra care during assembly and do not make mistakes.
5.Check whether the bearing noise, temperature rise and vibration meet the requirements
Generally, the working temperature of the bearing should be lower than 90 ° C. When the temperature is too high, the bearing will be annealed or burned, which will reduce the service life.
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