Correctly judge the running rules and faults of rolling bearings

Rolling bearings exhibit strong regularity during their use and are very repeatable. Normal high-quality bearings (rolling bearings) have relatively small vibration and noise at the beginning of use, but the spectrum is somewhat scattered and the amplitude is small, which may be due to some defects in the manufacturing process, such as surface burrs.

After a period of motion, the vibration and noise are maintained at a certain level, and the spectrum is very single, only one or two times the frequency. There are very few spectrums above the power frequency, and the bearing status is very stable and enters a stable working period.

After continuing to run, the vibration and noise of the rolling bearing begin to increase, and sometimes abnormal sounds appear, but the change of vibration increases slowly. At this time, the bearing kurtness value suddenly reaches a certain value. We believe that the rolling bearing is an initial failure at this time.

At this time, it is required to closely monitor the rolling bearing and pay close attention to the change. After that, the bearing kurtosis value begins to drop rapidly and approaches the normal value, while the vibration and noise begin to increase significantly, and the increase rate begins to accelerate. When the vibration exceeds the vibration standard (such as ISO2372 standard), the bearing kurtosis value also begins. Rapid increase, when both the vibration standard is exceeded, and the kurtosis value also exceeds the normal value (the available kurtosis is relative to the standard), we believe that the bearing has entered the late fault production, and it is necessary to repair the equipment in time and replace the rolling bearing.

Rolling bearings show late fault characteristics to serious faults (generally bearing damage such as axles, burns, sand cracks, raceways, bead wear, etc.) are not more than one week. The larger the equipment capacity, the faster the speed. The shorter the interval. Therefore, in the actual rolling bearing fault diagnosis, once the late fault characteristics are found, the bearing should be judged decisively and the maintenance should be arranged as soon as possible.

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FAG imported bearings anti-friction bearing maintenance and lubrication

Proper lubrication of anti-friction bearings in FAG bearings is critical to their successful operation. For ordinary or sleeve type bearings, there are different principles in different practices. In order for the party to maintain anti-friction bearings, these principles must be understood and applied.

After fully understanding these principles, you should have a key consideration. We quote from FAG Bearing Industries' "Guidelines for Improving Bearing Lubrication": "...the characteristics of the lubricant, especially the characteristics of the grease, cannot be determined solely on the basis of specifications." Specifications are only physically applicable to a product, and may include chemical descriptions. Practicality can best explain the problem, but the specifications are almost not related to the practical.

The anti-friction bearings in all FAG bearings basically contain two hardened steel rings, a plurality of hardened balls or rollers, and a separator or cage that separates the rollers or rollers. These types are divided into many categories in use. Some types, such as needle-like column bearings, may have no inner ring and the rollers move directly on the hardened shaft.

Types of anti-friction bearings in FAG bearings:

Anti-friction bearings are divided into two main types. They are ball bearings and roller bearings. At the same time, we also know that due to the different uses of the manufacturer and the bearing, many different types have evolved according to these basic structures.

Lubrication function:

Anti-friction lubricants have the following main functions

1. Lubricate the sliding contact between the retainer and the rest of the bearing.

2. Lubricate any contacts between the race and the roller that is not actually rolling.

3. Lubricate the sliding contact between the roller and the guide in the roller bearing.

4. Lubricate all the truly rolling contacts in the bearing.

5. Protect highly delicate surfaces from corrosion.

6. Assist the sealing cover to protect against foreign matter. Grease has a magnetic function.

7. Provide a means of conducting heat (cold).

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