METHOD FOR MANUFACTURING ANNULAR MOLDED ARTICLE |
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| 申请号 | EP14775622 | 申请日 | 2014-03-28 | 公开(公告)号 | EP2979774A4 | 公开(公告)日 | 2016-09-28 |
| 申请人 | HITACHI METALS MMC SUPERALLOY LTD; HITACHI METALS LTD; | 发明人 | KIKUCHI HIROAKI; TAKIZAWA HIDEO; ISHIWARI YUJI; OHSONE JUN; | ||||
| 摘要 | The present invention is directed to a method for manufacturing an annular formed body comprising a forging step of forging an alloy piece to provide a forged body having a disc shape, and a ring rolling step of ring-rolling an annular intermediate body prepared by forming a through-hole in the forged body to provide an annular formed body, characterized in that the forging step comprises at least two hot forging steps, each of the hot forging steps being carried out under the conditions that a strain rate is at most 0.5 s -1 , an absolute value µ¸1 of strain to the forged body in its circumferential direction is at least 0.3, an absolute value µh of strain to the forged body in its height direction is at least 0.3, and a ratio µh/µ¸1 between the absolute values of strain is within a range from 0.4 to 2.5. | ||||||
| 权利要求 | |||||||
| 说明书全文 | |||||||
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