METHOD OF CONTROLLABLE TIGHTENING OF THREADED JOINTS Russian patent published in 2005 - IPC

FIELD: measuring engineering.

SUBSTANCE: method comprises setting the bolt in the bench, locking it against rotation, applying axial loading equal to that of axial tightening of the bolt head in the direction opposite to the nut and screwing the nut in until it reaches the position where the loading is less than the working axial loading. The bolt is then unloaded, the nut is screwed out by one turn, bolt is completely loaded, and nut is screwed in up to a given position on the thread, with measuring torque in screwing. The nut is then screwed out, bolt is removed from the bench, is mounted on the members to be joined, and the nut is screwed in with the torque equal to the tightening in the second stage of the loading in the bench.

EFFECT: enhanced precision.

4 dwg