Analysis of rolling bearing scars

Source: China Bearing Network Time: 2018-03-01

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In the ordinary use of imported bearings and procurement, there will always be some technical problems; the formation of point-like pits on the outer surface of the plain bearing alloy or the formation of linear scratches and pull grooves along the circumferential direction of the bearing are generally called scars. It is An uneven wear; often composed of foreign matter; sometimes such scars can also occur on specific parts of the bearing. The size and depth of the point-like scars and the length and depth of the linear flaws and the method of walking the foreign bodies are practical. change.
Some buried foreign matter; when its convex height exceeds the thickness of the oil film; it will collide with the axis to generate heat; when severe, the alloy around the foreign object melts; constitutes a point-like hole. If the foreign matter is carried away by the smooth oil; then the surface of the bearing alloy It forms a point-like mark. Sometimes the foreign object is reversed with the axis; the bearing is scratched; it forms a linear flaw. Although the flaw is a partial wear phenomenon, the oil film of the smooth oil is thinned or damaged due to the concave hole and the groove; Therefore, it often causes the bearing to wear out prematurely.
The composition and shape of the scar are related to the thickness and load of the oil film; the appearance quality of the shaft and the bearing, the raw material, the smooth oil flow track, the shape and size of the foreign matter, and the variety. If the layer thickness of the Babbitt alloy is 0.5 mm, the foreign matter Embedded in the alloy layer; the appearance can be restored to the original shape without forming a flaw. If the gold-containing layer is thin and hard, there are more opportunities for linear flaws. If the foreign matter is small and large, it will appear in the shape of the oil flow orbit. Shaped scars. If the foreign matter is large, it will constitute a significant linear scar. Follow the movement; it will show the embedding of foreign objects; the movement, crushing, pressing and welding; and at the same time further forming linear scars Therefore, according to the shape of the scar, the variety and nature of the foreign body can be estimated.

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