| 摘要 |
PROBLEM TO BE SOLVED: To provide a fastening device and a fastening method by a rotation angle method, which optimally perform fastening work by determining a snag point for every fastening work. SOLUTION: This fastening device is provided with a driving part 11 for rotating and fastening a fastening part 2, a detecting part 12 for detecting torque applied to the fastening part 2 and the rotation angle of the fastening part 2, and a determining part 14 for determining the snag point from a value detected by the detecting part 12. The determining part 14 calculates a variation in the torque at every specific rotation angle of the fastening part 2, and determines as the snag point when its variation is within a range regarded constant. COPYRIGHT: (C)2011,JPO&INPIT
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