Bearing damage diagnosis method of judging, tradition is based mainly on the monitoring and diagnosis of the classified status of, classified according to the nature of the measuring signal, the main method of temperature, oil analysis, bearing vibration signal analysis method and analysis of stator current signal method h-el0 method of temperature by monitoring the temperature to determine the SKF bearings housings are working properly. Temperature monitoring on the bearing load condition, speed, and reflect a more sensitive to changes, in particular, are sensitive to poor lubrication bearing overheating resulting. Therefore, for such occasions more effective. However, when early bearing such as pitting, spalling failure of comparison, minor wear tiny, temperature monitoring and largely reflect, only significant failure reaches a certain level, can only be detected using this method. Therefore, temperature monitoring does not apply to so-called local damage such as corrosion, localized spalling failure.
Oil sample analysis is one out of used lubricating oil from the bearing oil samples, through the collection and analysis of oil samples to determine the size and shape of metal particles in FAG bearings and failure of. This method is only suitable for oil lubrication shaft, but not the grease lubricated shaft. In addition, this approach is vulnerable to other effects of non-bearing particles fall damage. Therefore, this approach has a lot of limitations.
Bearing vibration signal analysis method is by installing in housings or housing of appropriate orientation of vibration sensors, and transform a collection bearing vibration signal in time domain to the frequency domain, thereby bearing vibration signal in frequency domain inherent vibration characteristics in the frequency domain as compared to, to determine whether the bearing failure. Because of their application in various types of bearings and signal testing and treatment is simple, intuitive, and diagnostic accuracy rate is very high, thus becoming a NSK is currently the most widely used method of bearing fault diagnosis. But it need to be installed on the bearing vibration sensor, which increases investment and maintenance. Also, on many occasions in motor vibration sensors are installed on the device is rather inconvenient, thus affecting its usefulness.
Fatigue failure was a failure of the Timken bearings surface forms, mainly for fatigue crack initiation and extension and fracture processes, long term effects of alternating load resulting from failure of metal. Cracks in two ways:
1, and from surface Shang see, this is bearing in scroll contact process in the, because in work surface of plastic deformation and strain hardened surface of contact stress cyclical changes by caused of external load of role, and finally in small crack from development of within surface, in both Zhijian of surface crack of formation, because work surface of lobby doors wedged into lubricant, open of forces, severe against in wall Shang, forced crack forward advance;
2, surface layer, under repeated pressure, surface contact, initially in the cracks exposed places on the surface of some depth of cracks, surface direction and point of view, to a certain depth, from the contact surface of the surface, and go beyond the surface and ultimately corrosion formation split, leaving a Ma Hang.
From INA bearings surface Shang see, also is from surface layer of crack, this two a target (parts carburizing, quenching and other surface heat treatment, Hou if has hardness not uniform, organization, and non-uniform of within force and other adverse, is contact stress General is from produced instead of underground crack of effect Xia, if parts surface quality poor, exists a defects (oxidation, de carbon), friction or lubrication bad, from surface crack.



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