MANUFACTURING METHOD OF TOOTH PROFILE FORGING HAVING TOOTH PROFILE SURFACE ON CYLINDRICAL PORTION

摘要

PROBLEM TO BE SOLVED: To provide a manufacturing method of a tooth profile forging having a tooth profile surface on a cylindrical portion which can forge the tooth profile surface on the cylindrical portion with high precision. ;SOLUTION: In this method, the tooth profile forging 1 provided with tooth profile surface 20 having the cylindrical portion 2 erected from a base 10 and having an uneven shape on an outer circumferential surface or an inner circumferential surface thereof is manufactured. The base 10 and the cylindrical portion 2 are formed by hotforging a work, the tooth profile surface 20 having the uneven shape on the outer or inner circumferential surface of the cylindrical portion 2 is provided, a recess 3 which is recessed toward the protruding direction of a projecting portion 21 is provided on a back side 25 of the projecting portion 21 of the tooth profile surface 20, and the cylindrical portion 2 is cold- forged with the recess 3 in a non-restricted condition.;COPYRIGHT: (C)2001,JPO