| 摘要 |
Provided is a hollow component which, despite being formed from thick plates, does not present problems as far as strength or operating environment, and which is advantageous in terms of cost as well; also provided is a manufacturing method thereof. A first collar unit (C1) is formed by flow drilling one plate (20) of a pair of plates (20, 21) having a gap there between. A second collar unit (C2) is formed when the other plate (21) is flow drilled, and a cylindrical connection body (C) is formed by fusing the inner end portion of the second collar unit (C2) and the inner end portion of the first collar unit (C1), reinforcing the flat plates. |
