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Abnormal Phenomenon of FAG Clutch Bearing Operation

Source: FAG bearings  Tags: News

Under normal circumstances, the clutch bearing will not be excited, but if an excitation occurs, you must check the situation. Causes and emergency measures of some faults during the use of FAG bearings:

1. Rolling sound of bearings

Use the sound of the size and sound quality of the audio equipment to check the operation of the FAG bearing. Even if the clutch bearing is slightly peeled off and other damage, the abnormal tone and the sound emitted by the irregular measuring device will be distinguished from the sound measurement.

2. Bearing vibration

FAG bearing vibration is very sensitive to bearing damage, such as flaking, indentation, rust, cracks, wear, etc. will be reflected in the bearing vibration measurement, therefore, by using a special bearing vibration measurement (frequency analyzer, etc.) to measure the magnitude of the vibration, Frequency analysis can be inferred through unusual situations. The measured values ​​for the location of the sensor used or installed under the bearing conditions are different, so each machine requires the analysis and comparison of the standard measured values ​​determined in advance.

3. Bearing temperature

The temperature of the bearing, generally the temperature outside the FAG bearing room, can be inferred, if the hole can be used to directly measure the temperature of the outer ring of the bearing, it is more appropriate. Under normal circumstances, the bearing temperature rises for 1-2 hours and slowly reaches a steady state. The normal temperature of the machine with the heat capacity of the bearing, large heat capacity, changes in speed and load. If the lubrication clutch bearing is operated during inspection and troubleshooting, install the appropriate parts, the bearing temperature will rise suddenly, and the operation will stop when abnormal high temperature occurs, and take necessary precautions.  ERIC BEARING LIMITED also can supply some FAG clutch bearings , if you interested , pls click here : 

After the demolition, check the damage of the clutch bearing, according to the damaged FAG bearing, to determine the cause of bearing failure and damage.

Crisp sounds, sharp squeaking noises may be due to insufficient lubrication due to improper bearing clearance can also cause metallic sounds. Dimples on the outer ring of the bearing can cause vibration. As for the equipment caused by knocking on the scars, it will generate noise, which has different speed levels. If there is intermittent noise, then the rolling part may be damaged, this sound appears, when the surface is damaged, the launch date, if the hissing sound pollution often causes serious damage to the clutch bearing, and causes huge irregularities noise.

But usually it is not necessary to replace the clutch bearing at this time. Therefore, damage can of course also be perceived through hearing. If better methods are used, such as electronic health monitoring equipment, the operation before eruption.

FAG rolling mill bearing noise causes regular maintenance

When the FAG bearings that are disassembled during the regular maintenance, operation and peripheral parts replacement of the rolling mill are discontinued, it is necessary to determine in turn whether the secondary bearing parts can be used again and record whether the operation status is good or bad.

1. Any one of the inner and outer rings, rolling elements, and standoffs has cracks and fragments.

2. Any one of the inner and outer rings and rolling elements is peeled off.

3. The raceway surface, ribs and rolling elements are significantly stuck.

4. The wearing of the stand is serious or the rivets are loose and fierce.

5. The raceway surface and rolling elements are rusty and scratched.

6. The rolling surface and rolling body have significant indentation and scratches.

7. There is creep on the inner diameter surface of the inner ring or the outer diameter of the outer ring.

8. Overheating and changing color fiercely.

9. The seal ring and dust cover of the grease-sealed bearing are seriously damaged.

The control methods for the impact sound of the rolling elements are: appropriate reduction of radial clearance, use of bearings with a reasonable structure and a compliant material cage.

The second is the rolling sound of the rolling mill bearings and its control method. The rolling sound is a smooth and continuous sound made by the rolling body rolling on the raceway surface when the bearing is running. It is a unique basic sound that occurs in all FAG bearings. sound. The general bearing sound is the raceway sound plus other sounds. The greater the rigidity of the bearing housing, the lower the sound pressure level of the raceway sound. If the radial clearance is too small, the sound pressure level and main frequency of the raceway sound will increase sharply as the radial clearance decreases.

The methods to control the raceway sound are: select low-noise bearings, that is, bearings with very low waviness, and carefully select the conditions of use. The sound of the raceway often affects the noise of the entire machine. Reducing the sound of the raceway can reduce the noise of the whole machine.

The last is the rolling sound of the imported bearings of the rolling mill and its control method. The rolling sound is the harsh metal friction sound that can occur in cylindrical roller bearings in all occasions. Most of them occur in the grease-lubricated larger bearings, and the base oil Deteriorated greases are more likely to occur and hardly occur during oil lubrication. In addition, it is more likely to occur in winter. When it is subjected to pure radial load, it is easy to occur in the case of large radial clearance, and depending on the size of the model, it is easy to occur within a specific speed range, which will occur continuously. Will appear intermittently again. The outer ring raceway adopts special processing methods to prevent the occurrence of rolling noise. If necessary, this bearing can be used, or the radial clearance of the bearing can be appropriately reduced, the grease with excellent performance and the rigidity of the matching parts of the bearing can be improved .

However, sometimes due to inaccurate measurement of the shaft diameter and bearing hole size of the rolling mill or the roughness of the mating surface does not meet the standard requirements, resulting in an excessive interference fit, the bearing ring is greatly squeezed, resulting in the radial bearing itself The reduced clearance makes it difficult for FAG bearings to rotate, generate heat, increase wear or seize, and in serious cases will cause the inner and outer bearing rings to crack during installation.