| 摘要 |
To put mass production of a sprocket with dog gear by forging to practical use, a worked product is manufactured by a first step of forming by hot forging means a primary workpiece having a shape comprising the sprocket and the dog gear adjacent to each other; a second step of forming a secondary workpiece having accuracy increased by setting the primary workpiece in a cold forging apparatus; and a third step of forming by cutting means a cut-in groove of a fixed depth perpendicularly to an axial direction in a boundary between a dog gear and a sprocket of the secondary workpiece.
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