No full-text available
To read the full-text of this research,
you can request a copy directly from the authors.
Further Work on Analyzing Accuracy and Overall Performance of Torque Tools for Assembling Bolted Flanged Joints
Abstract
Over the past two years, the accuracy and repeatability of equipment used to assemble bolted flanged joints have been studied, and progress has been reported in past papers. One of the findings has been that pneumatic torque wrenches demonstrated a broader plus/minus range on bolt stress from the targeted value (e.g., lack of accuracy) than manual or hydraulic torque wrenches. What was notable, however, was that the repeatability of the bolt stress that was achieved did remain consistent with the other types of torque wrenches. Since the repeatability has been shown to be consistent, attention has turned to investigating and determining the reason for the perceived lack of accuracy. One aspect that might account for this is the calibration of the pneumatic torque wrenches.
This paper outlines and documents the research that has recently taken place to identify the parameters that are key elements in improving the accuracy of pneumatic torque wrenches that might form the basis of development of a standard for calibration of powered torqueing equipment.
... The last update of this standard was split up into two parts, one for hand torque tools conformity and the other for requirements of calibration and determination of measurement uncertainty. Once the last version was released, several researchers were inclined to investigate its added value and applicability [3][4][5][6]. For the torque transducers, which can be considered the backbone in torque measurements, DIN 51309 [7] and BS 7882 [8] are the most used standards. ...
... The following figures (Figs. [2][3][4][5][6][7][8] show the relative interpolation errors for selected calibrations as an example to present the idea of using fitting equation coefficients resulting from calibration in one direction to calculate torques in both directions. Lines in red (square pullets) represent appplying the CW calibration coefficients to calculate the actual torque in CW and CCW directions while lines in black (circle pullets) represent applying the CCW calibration coefficients to calculate the actual torque in both CCW and CW directions. ...
ResearchGate has not been able to resolve any references for this publication.