Such as improper assembly, bad lubrication, water and foreign invasion, corrosion and overload, etc may lead to premature failure NSK bearings. Even in the installation, lubrication and use is normal maintenance, after a period of time running, bearing also can appear fatigue spalling and wear and can't work normally. In short, rolling bearing fault reason is very complicated. Rolling bearing fault form and the main reasons are as follows.

1. Fatigue spalling

The inside of the rolling bearing groove and roller surface is loads relative rolling again, because the role of alternating load, first in certain depth below the surface in (maximum shear stress in the crack formation and extend to contact surface spalling pit top happen, and finally to large peeling, this phenomenon is fatigue spalling. Flake fatigue can cause in the operation of impact load, vibration and noise intensified. Usually, fatigue spalling is often the main failure causes of rolling bearing, the general said bearing life means bearing fatigue life, bearing life tests is fatigue test. Test procedures provisions, in groove or appear on roller area of 0.5 was the fatigue spalling pit that bearing life to an end. Rolling FAG, the fatigue life of a bearing dispersion, with a group of bearings, the maximum life and minimum life can differs a few times and even one hundred times on, this from another Angle that the rolling bearing fault monitoring is of great importance.

2. Wear

Because of the dust, foreign bodies, intrusion into a groove and will cause the relative motion roller surface wear, bad lubrication will also aggravate wear, wear the results of the bearing clearance increases, the surface roughness increases, reduces the accuracy of running bearings, and also reduces the motion precision of the machine, vibration and noise is getting higher. For precision machinery INA bearing, is often wear is the life of the limit bearing.

In addition, still have a kind of a little vibration wear. In bearing not rotating because of the effect of the vibrations, rolling body and groove surface of tiny, repeatedly have between the relative sliding and develop blemishes, in the groove is formed on the surface of the ground vibration lines) mark.

3. Plastic deformation

When IKO due to excessive bearing the impact load or static load, or because of the heat caused by deformation of extra load, or have high hardness foreign intrusion in groove surface will form dent or scratches. This will make the bearing in during the running of the violently vibration and noise. And as soon as the indentation, indentation causes the impact load will further cause of surface spalling nearby.

4. Corrosion
Corrosion of rolling bearing is one of the most serious problems, the high accuracy KOYO bearing may because the surface corrosion cause loss of precision, and not continue to work. Water or acid and alkaline substances directly causes corrosion 4 bearing. When bearing stop work, bearing temperature to drop dew point, in the air moisture condenses into water droplets attached to the bearing surface also can cause corrosion. In addition, when bearing internal is energized, the current may through the groove and rolling body on the contact point place, very thin oil film produced by electric spark electrical erosion, on the surface of the formation of uneven hemilateral pan.
 



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