| 摘要 |
Provided are a new rotating body, rotating body material, and manufacturing method for a rotating body, which make it possible to shorten the cutting distance in an inner diameter axis direction of an inner diameter surface to thereby suppress the processing cost of the inner diameter surface and manufacture an inner rotor at lower cost. An inner diameter surface (12) into which a shaft of a metallic rotating body (11) is press-fitted is provided with a processed portion (13) subjected to cutting processing at one end side, and an unprocessed portion (14) not subjected to cutting processing at the other end side. The inner diameter of the processed portion (13) is formed smaller than the inner diameter of the unprocessed portion (14). Chamfered portions are provided, respectively, in both end portions of the inner diameter surface (12), the chamfered portion (15) in the end portion at one end side is subjected to cutting processing, and the chamfered portion (6) in the end portion at the other end side is not subjected to cutting processing. An inner diameter surface (2) of a material (1) that is processed into the rotating body (11) is provided with a small-diameter portion (3) at one end side and a large-diameter portion (4) having a larger inner diameter than the small-diameter portion (3) at the other end side. A step (5) is formed between the small-diameter portion (3) and the large-diameter portion (4), and the chamfered portion (6) is formed in an end portion at the other end side. |
