| 摘要 |
Spaced tooth-like projections are formed on the circumferential periphery of a ring-like body member by cold plastic forming operations carried out on an annular section made of a forgeable material which projects transversely from the body member. The annular section has a substantially rectangular cross-section with a pair of spaced transversely extending face surfaces. Initially, while the ring-like member is supported against movement, alternate flat bottomed indentations and chamfered surfaces are formed in a pressing step on one of the transversely extending face surfaces. Next, grooves are extruded from the annular section between the chamfered sections so that the chamfered sections form an end, and the side surfaces of the grooves form sides of the tooth-like projections. The extruded material is cut off and the sides of the grooves are tapered by a working operation performed from the other one of the transversely extending face surfaces for completing the formation of the tooth-like projections.
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