RETAINER MANUFACTURING METHOD FOR TAPER ROLLER BEARINGS

摘要

The method for manufacturing a taper roller bearing retainer comprises a first shearing molding process through which a shearing molding product(20a) is formed, where a circular hole(21) is formed on the center portion of a retainer, a plurality of T-shaped protrusions(23) are formed on the outer periphery thereof, and a plat surface(24) is formed between the circular hole(21) and the protrusions(23); a second drawing molding process through which a conical drawing molding product(20b) is formed, where the upper edge(25) of the T-shaped protrusion(23) are contacted in a conical shape to draw the flat surface(24) and the protrusions(23) upwardly; and a third upper edge molding process through which a ring-shaped edge(26) is covered and compressed on the upper edge(25) of the drawing molding product(20B).