Bearing move part of the surface material like fish scales fall off, this phenomenon is called fatigue spalling. Move the bearing running process, absorb a certain amount of load, even if is the static load, but for steel ball and raceway, the stress is a cycle of reciprocating, exhaustion of materials will occur to move so that the SKF Bearings From FANADE http://www.fagbearings-hk.com/SKF-Bearings.html to life. And there are several different definitions of miniature bearing "life", one of which is known as the "service life", it represents a certain bearing before damage to the actual life is caused by the wear and tear, damage is not usually tired, but due to abrasion, erosion, sealing damage, etc.
　　Test in the laboratory or in be used actually as it is, however, can be significant, the appearance of the work in the same premise the same bearing, real life was very different.
　　Diameter of axle and bearing shell direct contact to prevent adhesion formation and boundary lubrication performance. Factors influencing the friction pair friction compatibility of the material is:
　　(1) into a deputy to the difficulty of the composition of alloy materials metallurgy.
　　(2) materials and affinity of lubricant.
　　(3) into a vice material in the absence of the friction factor of lubrication condition.
　　(4) the microstructure of materials.
　　(5) the thermal conductivity of materials.
　　(6) the size of the material surface energy and the properties of the oxide film.
　　Material allows foreign clamp into the hard particle in the lubricant and prevent scratches or (and) the ability of abrasive wear. For metallic materials with low hardness and elastic modulus, embedding, and non-metallic materials are not necessarily, carbon graphite, for example, low elastic modulus, but the embedded sex is bad. Miniature bearing usually use soft material and hard material forming friction, usually made from soft material bearing shell.
　　Bearing of life revolution (or in the hours of work under a certain speed), the definition: within the life of the bearing, should occur at any bearing ring or move on its initial fatigue damage (spalling or defect). Most bearing smoke a lot bad reason - beyond the original estimates of load, the effective sealing, tight fit too small, as a result of bearing clearance, etc.
　　Any of these factors factors there is its special damage forms and will leave a special signs of deterioration. Examine the damage to the bearings in most cases, therefore, can discover the possible causes, generally speaking, a third of the miniature bearing damage resulting from the fatigue damage, a third of the other resulting from poor lubrication, a third of the other resulting from pollutants into the bearing improper handling or installation.
However, the damage pattern is also related to the industry don't. Pulp and paper industry, for example, mostly due to bad lubrication bearing damage or contamination caused by not because of material fatigue.