| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that a carburized layer of a dedendum part of a tooth profile becomes too thin when forming a carburized blank in a gear shape, and a carburized layer of a tooth flank part becomes excessively thick if the initial carburized layer is formed deeper in order to ensure the carburized layer of the tooth flank part. SOLUTION: In manufacturing the gear G, a blank B is formed into an intermediate forging F in a first forging process, and the intermediate forging F is forged into a gear shape in a second forging process. Deformation of the dedendum part of large plastic deformation after carburizing is reduced to prevent the carburized layer C of the dedendum part from being too thin, and appropriate depth of both the carburized layer C of the tooth flank part and the dedendum part can be ensured even if the initial carburized layer C is formed to be deep.
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