Combination bearings move on the surface as the scales fall off as part of, this phenomenon is called exhaustion spalling. Move in the process of running bearings, withstand the load, even if is the static load, but to steel ball and groove is concerned, its stress is reciprocating cycle, the materials will be move to reach bearing fatigue life. In addition there are several kinds of different definitions FAG bearing "life", one of the so-called "working life," it said a combination bearings in before the actual damage to life is worn, the damage by does not usually caused by the tired, but by wear, erosion, seal causes such as damage.
But no matter in the laboratory tests or in be used actually, can be significant see, in the same job premise appearance the same combination bearings, real life is different.
Direct contact with bush trunnion when to prevent adhesion and formation boundary lubrication performance. Effect of friction friction pair compatibility materials factors:
(1) into vice material metallurgy constitutes, to the difficulty of the alloy.
(2) material and lubricant and ability.
(3) into vice material in no lubrication state of the friction factor.
(4) the microstructure of materials.
(5) material thermal conductivity.
(6) material surface can size and oxidation film properties.
Materials allowed in lubricant foreign hard particle clamp into and prevent scratch or (and) of abrasive wear ability. As for metal materials, low hardness and elastic modulus low, embedding, and nonmetallic material does not, for example carbon graphite, elastic modulus is low, but embedding is bad. FAG bearing with a soft material and often a hard material composition of friction, general use a soft materials do bearings.
Bearing service life of RPM (or with a certain speed of work is the number of hours), definition: in this life within the combination bearings, should be in any of its bearing circle or move body on preliminary exhaustion damage happens (flake or defect). Most of the bearing a bad reason a lot-beyond the original estimate of load, the effective sealing, close cooperation in the small bearing clearance, etc.
Any of these factors all have their special factors and will leave special damage type of damage trace. Therefore, examines bearing damage, in most cases can find the possible causes of, all in all, a third of FAG bearing damage resulting from fatigue damage, another one third thanks to bad lubrication, the other a third thanks to pollutants into the combination bearings or install not handled properly.
However, these damage type also and industry don't relevant. For example, pulp and paper industry often because bad lubrication or pollution damage caused by combination bearings and not because of material fatigue is the result of.
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