Patent ID: 8904844
Filing Date: 2014-12-09
Classification: B21J,B21K,E02F,F16H,Y10T

Abstract:
1. A method of manufacturing a sprocket segment that is formed by forging as one of a plurality of circumferentially divided parts of a sprocket having a plurality of teeth arranged on an outer peripheral surface of a circular flange, the method comprising: forming a material of the sprocket segment into an initial formed state in an initial forming step; and subjecting the sprocket segment in dies to a finish forming process with a tooth trace direction of the sprocket segment as viewed in cross-section of the sprocket segment being inclined relative to a forging direction of the dies in a finish forming step, one of the dies being mounted to a mount surface and disposed between the mount surface and another of the dies, the finish forming step including forming a burr portion in proximity to a ridgeline of the sprocket segment when forming the sprocket segment by forging, a portion of the burr portion on a mount-side end of the sprocket segment and a portion of the burr portion on a tooth-side end of the sprocket segment being parallel to the mount surface of the dies, the ridgeline being disposed between a radially-facing tooth surface and an axially-facing lateral end surface of the teeth.