Patent ID: 8875803
Filing Date: 2014-11-04
Classification: B25B,B28B

Abstract:
1. A method for tightening a bolted connection with elongation of a bolt using a power wrench where linear movement of a hydraulic cylinder is converted into a rotational movement of a tightening tool, the method comprising: determining an angle of a rotation generated by a stroke of the hydraulic cylinder of the power wrench used; subjecting the bolted connection to a predetermined snug torque; and tightening the bolted connection through a predetermined number of strokes of the hydraulic cylinder of the power wrench, wherein is determined in advance the rotation angle generated by the stroke of the hydraulic cylinder of the power wrench used and/or the elongation generated by the stroke of the hydraulic cylinder of the power wrench used and/or the elongation of the bolt generated by the rotation angle for the type of power wrench and/or type of bolt used.