Verfahren zur Herstellung einer Radnabeneinheit und korrespondierende Pressvorrichtung

摘要

A cylindrical portion (19) formed in the inside end portion of the hub (2) is caulked and spread using a pressing mold (20) assembled to an oscillating/caulking apparatus to thereby form the caulking portion. In working or forming the caulking portion, a cylindrical projecting portion formed in the central portion of the leading end face of the pressing mold (20) is inserted into the cylindrical portion to thereby prevent the inside diameter of the cylindrical portion (19) from reducing excessively. <IMAGE>