Patent ID: 8341844
Filing Date: 2013-01-01
Classification: B24B,C21D,F16C,Y02P,Y10T

Abstract:
1. A manufacturing method of an outer ring for a double-row bearing unit, comprising preparing the annular outer ring comprising first and second raceways formed on an inner circumference thereof, a diameter of the first raceway being larger than a diameter of the second raceway; preparing a grinding tool comprising a first grinding wheel and a second grinding wheel, wherein the first grinding wheel comprises a first working surface having a shape corresponding to the first raceway, and the second grinding wheel comprises a second working surface having a shape corresponding to the second raceway; moving the grinding tool inside the annular outer ring from the first raceway side; and grinding the first and second raceways simultaneously by contacting the first and second surfaces of the grinding tool with the first and second raceways, respectively, wherein a property of the first grinding wheel and a property of the second grinding wheel differ from each other in at least one of a grain size, a grade and a grain structure such that a tendency of one of shedding and clogging of the first working surface and a tendency of one of shedding and clogging of the second working surface are substantially equal to each other.