Imported bearing fault repair

Simple diagnosis means that in the vibration detection, the size of some vibration parameters is generally tested, and the state of the imported bearings is judged by comparison with the standard value (threshold value). In the simple diagnosis of the imported bearings of the locomotive, the time domain is mainly selected. The KV acceleration RMS parameter Xrms of the wave kurtness coefficient parameter is used as the fault judgment parameter. The kurtosis index KV is a dimensionless parameter, which is sensitive to the early fault of the imported bearing and is not sensitive to the operating conditions. When the bearing is imported When the working surface of the tooth surface is faulty, the impact pulse at the working surface defect will be generated every revolution. The larger the fault, the larger the amplitude of the impact response, the faster the KV value rises, but the KV is deteriorated with the late stage of the imported bearing failure. The value is reduced, while the opposite is the opposite. It is not sensitive enough to the early failure, but it rises with the failure of the imported bearing failure and the stability is better. In short, it is appropriate to obtain a reliable diagnosis of simple diagnosis, and it is appropriate to apply the kurtosis coefficient and the comparison value. It takes into account the sensitivity and stability of the diagnostic parameters. Traction motor imported bearing ground detection threshold Dongfeng 4 locomotive axlebox imported bearing top wheel detection threshold simple diagnosis has a better side, but there are also many shortcomings, when the imported bearing for simple diagnosis, the following will occur Several situations;
(1) The value of the imported bearing parameters is faulty, but the fault location cannot be determined.
(2) The imported bearing itself has no fault but is caused by failure during assembly (such as rotor dynamic imbalance, shaft misalignment, etc.).

(3) When the sensor is placed in the machine base, the measured fault signal is strong and weak (the inner ring is the smallest, the roller is strong, and the outer ring is large), so the error is judged according to the parameters. Through the analysis of the above three cases, the simple diagnosis does not determine the method of the failure of the imported bearing components, and can not solve the problem of "depending on the situation". Therefore, it is not enough to diagnose the fault of the imported bearing only by simple diagnosis, and it is necessary to carry out precise diagnosis.
When there is a problem with the imported bearings, the first idea should be to check the repairs, not to replace them. Today, we introduce the common types of repairs for the world's top imported bearings.
There are three types of normal imported bearing repairs:
 1. Imported bearing fault repair: When the imported bearing fails, stop the inspection and repair.
 2. Regular maintenance of imported bearings: In order to ensure the normal operation of the main engine, according to the requirements of the main machine and the design theory and experience of the imported bearings, set a maintenance cycle and regular maintenance.
3. Imported bearings early warning maintenance: using advanced imported bearing fault diagnosis technology, real-time monitoring of the use status of imported bearings, forecasting and repairing before the failure of imported bearings.
    During the operation of imported bearings, there must be phenomena such as sound, temperature and vibration. Therefore, for the maintenance of the imported bearings in operation, the abnormal changes of the imported bearings can be found by listening, touching, observing and using the imported bearing fault diagnosis instruments, and judging whether the imported bearings are in normal working state according to the changed state.

For more information and purchase please visit: https://www.supplyforever.com

Common problems and countermeasures in the use of FAG bearings

Strong metal tone
1. Abnormal load: choose the appropriate assembly clearance and preload
2, poor assembly: improve the machining accuracy of the shaft, improve the installation method
3. Insufficient lubricant: supplement or use suitable lubricant
Regular tone
1. Foreign matter causes channel corrosion, indentation, and scratches: cleaning related parts, using clean grease
2, channel spalling: fatigue wear, replace FAG bearings
Irregular sound
1. Intrusion of foreign matter: cleaning related parts, using clean grease
2, the clearance is too large: pay attention to match and choose the right clearance
3, steel ball scars: steel ball fatigue peeling or foreign body card damage, replace FAG bearings
Abnormal temperature rise
1. Too much lubricant: reduce lubricant
2. Insufficient lubricant, or not suitable: increase lubricant or choose suitable lubricant
3. The mating surface creep or sealing device is too large: FAG bearing outer diameter or inner diameter matching surface is corrected, and the sealing form is changed.
The rotary vibration of the shaft is large
1. Peeling: Fatigue peeling off, replacing FAG bearing
2, poor assembly: improve the machining accuracy of the shaft, improve the installation method
3, foreign matter intrusion: cleaning related parts, using clean grease
Lubricant leakage is greatly discolored
1. Too much lubricant: reduce lubricant
2, foreign body invasion: cleaning related parts
Type of anti-friction bearing:
    Anti-friction bearings are divided into two main types. They are ball bearings and roller bearings. At the same time, we also know that many different types have evolved according to these basic structures due to the different uses of the manufacturer and the bearing.
    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.

For more information and purchase please visit: https://www.supplyforever.com