| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a tightening method, along with a tightening device used therefor, of a screw such as a bolt with a tightening force being uniform and of high precision.SOLUTION: In order to reduce an effect of frictional force at tightening of a screw, a friction force reduction effect under vibration is utilized, resonance of vibration is utilized for enhancing effect of vibration, conversion and synthesizing are performed in vibration direction, with a cross section being cross-shaped while dimensions in longitudinal direction and lateral direction being integer multiple of half-wavelength of the wavelength of target frequency, meanwhile, a vibration body in longitudinal direction and vibration body in lateral direction are made to cross each other at a node 13 of vibration, and a bolt or a nut is put at a position 12 at which vibrational amplitude due to resonance becomes maximum for excitation, thus, friction reduction effect due to vibration is enhanced for tightening. Vibration that is applied to the bolt or nut is basically a mode which utilizes vibration in screw axis direction, however, a mode is possible in which, by causing staggering to the axial line of the vibrator, torsional vibration around screw axis is applied to it.</p> |
