Bearings in the process of use, wear and tear is a key bearing damage. He directly affects the life of the bearing and bearing the maintenance cycle. Many engineers have made a series of experiments on the wear of the bearings.
Bearing wear lower bearing efficiency, accuracy and service life and end-of-life, one of the main reasons for serious and even cause accidents. Study the wear mechanism of deep human understanding of the wear rules, the establishment of a more reasonable wear test method has extremely important practical significance for the right to guide the design and research new bearing materials to extend bearing life.
Operation of the bearing carrier, the inner and outer ring raceway surface and the rolling surfaces of the rolling bodies subjected to cyclic loading, and the material fatigue, in the raceway or the rolling surface called flaking scaly injury. Bearing the total number of rotations until Flaking called basic rating life, also known as the narrow sense of life. In the bearing and the shaft with ferrule called shaft washer, draw a large audience with the ferrule with the bearing housing or machine casing ring, shaft washer and seat are collectively referred washers. In addition to the above four parts, various bearing structure, as well as the other parts of their match. For example, rivets, dust cover, seal, stopper washers, retaining rings and tight sleeves.
Rated fatigue life, refers to a group of the same type of bearing operation under the same conditions, to which 90% of NSK bearing does not occur due to rolling contact fatigue spalling total number of revolutions. Constant speed, and more with a total running time to indicate the nominal fatigue life. Research bearing life, we can not only consider the fatigue life, but also to consider the bearing should have performance several use limits. For example, the the greased bearing grease life. Noise life and wear life, etc., according to different purposes, different usage limit reference, and therefore, most of the pre-selected experiences limit.
The wear of the bearings not only depend on the properties of the material, but also determines the speed of movement relative to the friction surface, the size and characteristics of the load, the friction surface between the medium and the metal surface quality. Factors bearing and tool wear is extremely complex, so countries neither form a unified metal wear test methods.
Field trials have dug grinding method, chemical analysis, radioactive, indentation method, surface profile projection method, gravimetric method and gage measurements several results of these tests are close to the actual situation, more reliable data, but a long time trial and constantly changing due to external factors, difficult to understand and analyze.



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