FAG imported bearing fault diagnosis technology mainly includes vibration diagnosis technology, ferrograph diagnosis technology, temperature diagnosis technology, acoustic diagnosis technology, oil film resistance diagnosis technology and optical fiber monitoring and diagnosis technology, etc. Among them, vibration, iron shop and temperature diagnosis technology are used more.
1. Vibration diagnosis technology
When the working surface of FAG imported bearing components has fatigue peeling, indentation or local corrosion, periodic pulse signals will appear during the operation of FAG imported bearing components. This periodic signal can be received by a sensor (velocity type or acceleration type) installed on the bearing seat, and the fault of FAG imported bearings can be diagnosed through the analysis of the vibration signal.
Features: Vibration diagnosis technology is widely used; online monitoring can be realized; diagnosis is fast, and the diagnosis theory is mature.
Application range: It is especially suitable for fault monitoring of FAG imported bearings in rotating machinery.
2. Ferrograph diagnostic technology
FAG imported bearing wear particles are closely related to their working conditions. Pass the lubricating oil with abrasive particles through a strong magnetic field. Under the action of the strong magnetic field, the abrasive particles are deposited on the ferrograph according to a certain rule. The ferrograph can be qualitatively observed on a ferrograph microscope or tested on a quantitative instrument. According to this, judge the working condition of FAG imported bearings.
Features: The machine does not need to be disassembled; the investment is low and the effect is good; the early fatigue failure of FAG imported bearings can be found; the wear mechanism can be studied.
Application range: It is suitable for fault diagnosis of FAG imported bearings lubricated with lubricating oil, and it is difficult for FAG imported bearings lubricated with grease.
3. Diagnosis technology of oil film resistance
A well-lubricated FAG imported bearing has a large resistance between the inner and outer rings due to the action of the oil film. Therefore, the abnormality of FAG imported bearings can be judged by measuring the resistance of the inner and outer rings of FAG imported bearings.
Features: The same evaluation standard can be used for different working conditions. Diagnosis of abnormalities such as surface peeling, indentation, and cracking is poor.
Application range: suitable for occasions where the rotating shaft is exposed.
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4. Optical fiber monitoring and diagnosis technology
Optical fiber monitoring is a diagnostic technology that directly extracts signals from the surface of imported FAG bearing rings. The displacement sensor made of optical fiber bundles includes a transmitting fiber bundle and a receiving fiber bundle. The light is reflected by the transmitting fiber bundle through the gap between the sensor end face and the surface of the FAG imported bearing ring, received by the receiving fiber bundle, and converted into electrical signals by photoelectric elements. Through the analysis and processing of the electrical signals, the operating conditions of the FAG imported bearings can be determined. Evaluation.
Features: The optical fiber displacement sensor has high sensitivity; the signal is extracted directly from the surface of the imported FAG bearing, which improves the signal-to-noise ratio; it can directly reflect the manufacturing quality, surface wear, load, lubrication and clearance of the rolling bearing.
Application range: Suitable for machines that can install the sensor in the FAG imported bearing seat.
5. Temperature diagnosis technology
If some kind of abnormality occurs in FAG imported bearings, the temperature of FAG imported bearings will change. Therefore, according to temperature changes, the fault of FAG imported bearings can be diagnosed, but the ability to judge abnormalities is very low.
Features: Simple diagnosis; good judgment on burns of imported FAG bearings.
Application range: It is suitable for simple routine diagnosis of FAG imported bearings in the machine.
6. Acoustic emission diagnostic technology
Metal materials need to release elastic waves due to internal lattice dislocations, grain boundary slippage or due to the occurrence and development of internal cracks. This phenomenon is called acoustic emission. When the rolling bearing is peeled or cracked, different types of acoustic emission signals will be generated. Based on this, the working conditions of FAG imported bearings can be evaluated.
Features: fast and easy diagnosis; online monitoring is possible.
Application scope: The new technologies developed in recent years are rarely used in FAG imported bearing condition monitoring.