SURFACE MACHINING METHOD FOR BEARING CONTAINING SINTERED COMPACT, AND ITS MACHINING APPARATUS

摘要

PROBLEM TO BE SOLVED: To improve the surface evenness of projections and the pore cover efficiency of a non-porous surface by machining the inside diameter surface by a correction bar having a large number of correction grooves in an upper end portion during the sizing process. SOLUTION: After the compression, a sintered bearing 10 is sized by a sizing means comprising an upper punch 30 and a lower punch 40, a large number of correction grooves 24 formed in the circumferential direction of the projecting correction parts 21 forming an upper portion of the correction bar 20 are allowed to pass through the bearing 10, and the surface evenness of the inside diameter surface in contact with a shaft of the bearing 10 containing sintered compact, and the covering efficiency of the pore formed on the surface are improved.