The rolling bearing is an important foundation component carrying the tool bodies, for the movement of bodies, acting and play the mechanical effectiveness of the immediate constraints. Usually it composed of rolling bearing rings, rolling element and cage. As isolation, to guide the rolling element cage is generally made ??by the cold by the low carbon steel. The multi-channel stamping processing inevitably produce damage in the matrix to varying degrees, often made ??into finished products, to cracking failure. Therefore, to determine the failure, find out the cause of cracking the main reason for its processing operations, and practical significance to improve product quality, reduce scrap. 
 1 Overview
A factory in the production of tapered roller bearings to keep the frame from 5 mm thick 08ALlsteel plate made ??by the cold. Cage purchased a group of conduct quality inspection, we found that the rolling sand, polishing a few to keep the aircraft in its concave corner local crack.
2 Experimental methods and results
 Chemical analysis and microstructure
Multiple cracking part of the interception in the cage of the sample, after polishing, polishing, and after the corrosion of the nitric acid alcohol made ??of metallographic specimens.



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