公开(公告)号：EP3530368A1

公开(公告)日：2019-08-28

申请号：EP19150295.4

申请日：2019-01-04

申请人： TOYOTA JIDOSHA KABUSHIKI KAISHA

发明人： HIRAYAMA, Masanobu ,  KATAGIRI, Takahide ,  TSUTSUMI, Yugo ,  HIROSE, Manabu ,  KATSUKAWA, Yasuhiro

IPC分类号： B21H5/02 ,  B23F19/00

摘要： A method for manufacturing a gear which effectively prevent a crack from occurring inside a tooth part when rolling processing is performed on a teeth part of a gear raw material is achieved. A method according to one embodiment for manufacturing a gear 15 by performing rolling processing on a tooth part 2a of a sintered gear raw material 2. The method includes, when the rolling processing is performed on the tooth part 2a of the gear raw material 2, pressing the gear raw material 2 toward a center of rotation of the gear raw material 2 by a rolling machine 4 and, when at least the rolling processing is performed on the tooth part 2a of the gear raw material 2 toward a center of a thickness thereof by a pressing machine 5, pressing a region A where an internal density of the tooth part 2a of the gear raw material 2 decreases.
The invention also relates to an apparatus for manufacturing a gear.