How to operate the FAG rolling bearing failure cause analysis

We can use sound, the size and quality of FAG bearings rolling sound in operation to check. Because bearing even slightly stripping damage, such as would an exception and irregular, and therefore with the sound of the measuring device to identify, have the effect of prevention in advance. FAG bearing vibration is very sensitive to bearing damage. Such as peeling, indentation, rust, crack and wear will be reflected in the bearing vibration measurement, therefore, through the use of special FAG bearing vibration tester ( Frequency analyzer, etc. ) Can measure the size of the vibration, through frequency points cannot deduce the abnormal situation. Measured values for roller bearings or sensor installation position and different using conditions, thus requiring prior to each machine is analyzed by the measured value of the determined after judgment standard. FAG bearing temperature, generally can be deduced according to the bearing on the surface of the outdoor temperature, if the use of oil hole can directly measure temperature of bearing outer ring, is more appropriate. Usually, FAG bearing temperature with operation began to slowly rise, 1 - After 2 hours to reach steady state. FAG bearing normal temperature due to the heat capacity of the machine, heat dissipating capacity, rotational speed and load. If the appropriate lubrication, installation department, the roller bearing temperature will rise sharply, appear unusually high temperature, must stop at this moment, take the necessary precautions. Based on a lot of test data, the average of the temperature of bearing outer ring while working in mechanical, for your reference. Due to temperature lubrication, rotational speed, load, the influence of environment, the temperature range of values in the table only said roughly. Using thermal device can monitor the bearing temperature at any time, and realize e. automatic alarm when the temperature is more than the household or stop to prevent the shaft accidents. FAG bearing fatigue failure is a failure surface form, main performance for fatigue crack initiation, expansion and fracture process, under the alternating load generated by the fault of the long-term effects of the metal. Cracks in two aspects: first, on the surface, this is, roller bearing in the process of rolling contact, because of the work in the plastic deformation and strain hardening on the surface of the contact stress on the surface of the cyclical changes caused by the effect of external load, and finally on the inner surface of the small crack from the development, the formation of surface crack between the two, because Xie into the lubricant on the surface of the work, the power of the open, crack down on the wall, crack force to move forward; Under the pressure of two: from the surface, again and again, the surface contact, the first where exposed on the surface of the crack depth of a crack, and along the surface direction Angle, to a certain depth, since on the surface of contact area, and beyond the surface, and finally form the corrosion, leaving a horse pit. On the surface, or from the surface of the crack, the two objectives ( Part carburizing, quenching and other surface heat treatment, if after have uneven hardness, organization, and the internal stress of non-uniform and other adverse, the contact stress is generally have the opposite under the influence of ground fissure, if parts surface quality is poor, there is a defect ( Oxidation and decarburization) Poor lubrication, friction or from the surface crack.