| 摘要 |
PROBLEM TO BE SOLVED: To provide a forging method and a forging device for a tooth form with crowning, which have simple constitution and efficiently form the tooth form with crowning. SOLUTION: The forging device is provided with a cylindrical die 21 having a plurality of tooth-form forming grooves 26, to which each tooth 76 of a material 71 is fitted, and having a die hole 24, which penetrates the die 21 with the same cross section along the axial direction of the die 21. A gear 81 with teeth 86 having a shape of a tooth-form with crowning is formed by elastically shrinking and deforming the base end side and the top end side of the die 21. Thereafter, the die 21 is elastically restored to its original state by releasing shrinkage-deformation, and the gear 81 is extracted from the die hole 24 expanded radially. Thus, a gear with teeth having a shape of a tooth-form with crowning is efficiently formed by the die 21 with a simple form, which has the die hole 24 having the same cross section along the axial direction, through a simple process. COPYRIGHT: (C)2007,JPO&INPIT
|
