| 摘要 |
PURPOSE:To improve the yield of a billet and to shorten a working time by subjecting a heating billet to a rough forming with a forging, to a ring rolling by inserting a mandrel into this center punched hole and forming a tooth profile with a die forging on the tooth profile forming face of a ring rolling body. CONSTITUTION:A rough forming body 12 is formed by a rough forging by heating a billet 10 and a center punched hole 12c is pierced by a punch at the center position of a web like part 12b. The center punched hole 12c of the rough forming body 12 is inserted by a mandrel 14 and the mandrel 14 and a main roll 15 are rotated then. And when the mandrel 14 is moved to the main roll 15 side with pressing the rough forming body 12 with its rotation, the outer peripheral wall of the rough ground forming body 12 is formed in the same shape of each groove with its sliding the groove of the main roll 15 and the inner peripheral wall with its sliding the groove of the mandrel 14 respectively. The rough forming body is then formed in an annular formed body 13. The necessary tooth profile 13a' is then formed on the tooth profile forming face of the annular formed body 13 with its die forging.
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