MANUFACTURING METHOD AND MANUFACTURING DEVICE FOR GEAR

To provide a method for manufacturing a gear, capable of suppressing an interval crack of a tooth part from occurring in a case where the tooth part of a gear coarse material is subjected to rolling.SOLUTION: A gear manufacturing method is a method for manufacturing a gear 15 by rolling a tooth part 2a of a sintered gear coarse material 2, and comprises: when rolling the tooth part 2a of the gear coarse material 2, pressing the gear coarse material 2 toward the rotation center of the gear coarse material 2 by a rolling machine 4; and when at least rolling is performed toward a thickness center of the tooth part 2a of the gear coarse material 2 by a pressing machine 5, pressing a region A in which the density inside the tooth part 2a of the gear coarse material 2 decreases.SELECTED DRAWING: Figure 6 【課題】ギヤ粗材の歯部に転造加工を施した際の当該歯部の内部の割れの発生を抑制できるギヤの製造方法を実現する。【解決手段】本発明の一形態に係るギヤの製造方法は、燒結されたギヤ粗材２の歯部２ａに転造加工を施すことでギヤ１５を製造する方法であって、ギヤ粗材２の歯部２ａに転造加工を施す際に、転造機４によってギヤ粗材２の回転中心に向かって当該ギヤ粗材２を押圧すると共に、押圧機５によってギヤ粗材２の歯部２ａの厚さ中央に向かって少なくとも転造加工を施した際に当該ギヤ粗材２の歯部２ａの内部の密度が低下する領域Ａを押圧する。【選択図】図６