| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a hydraulic thread bolt fastening device capable of preventing the breakage of a thread bolt and fastening and removing a highly loaded screw, and a method for controlling a pressure load of the hydraulic thread bolt fastening device. <P>SOLUTION: The hydraulic thread bolt fastening device includes a device (10) for detecting that the thread bolt reaches a yield point during the fastening of the thread bolt, and control devices (7, 11) for pressure-releasing the thread bolt fastening device (1) when reaching the yield point of the thread bolt to be fastened or immediately after the reaching. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
