Collection of core drill test piece for large size rotational shaft |
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| 申请号 | JP16316186 | 申请日 | 1986-07-11 | 公开(公告)号 | JPS6318237A | 公开(公告)日 | 1988-01-26 |
| 申请人 | Fuji Electric Co Ltd; | 发明人 | YAMAMOTO TAKAO; | ||||
| 摘要 | PURPOSE:To enable test pieces to be collected without damaging the reliability of the core of a rotational shaft by forging and thermally refining the rotational shaft provided with an excess diameter portion on the drum portion of the shaft and collecting the cores through a partial center hole that reaches only the excess diameter portion. CONSTITUTION:After thermal refining processing, such as quenching or annealing, is applied to a forged shaft 2, a partial center hole is coaxially drilled with the axis of the shaft 2 to the depth of an excess diameter portion 8 from the side of the shaft end on which the excess diameter portion 8 is provided. A partial core 10 is collected and core drill test pieces 5 are collected from the neighborhood of the distal end of the partial core 10. Thus, by providing a drum portion 6 with the excess diameter portion 8 and performing forging and thermal refining, the collected test pieces 5 can be dealt as representing material characteristics because the condition of the test pieces 5 closely resembles that of the core of the drum portion 6. On the other hand, since the excess diameter portion 8 is removed when the shaft 2 is machined to a rotational shaft 1, even though the center hole 9 is present in the portion 8, an acting stress in a reverse rotation can hold a lower level than that of the core of the drum portion 6 and no actual trouble is produced. Accordingly, the test pieces 5 can be collected without damaging the reliability of the core of the rotational shaft. | ||||||
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