US 12,169,151 B1
Determining tightening class of a tightening operation performed by a tightening tool
Lifei Tang, Nacka (SE); and Toni Axelsson, Gustavsberg (SE)
Assigned to ATLAS COPCO INDUSTRIAL TECHNIQUE AB, Stockholm (SE)
Appl. No. 18/718,135
Filed by ATLAS COPCO INDUSTRIAL TECHNIQUE AB, Stockholm (SE)
PCT Filed Nov. 9, 2022, PCT No. PCT/EP2022/081316
§ 371(c)(1), (2) Date Jun. 10, 2024,
PCT Pub. No. WO2023/110231, PCT Pub. Date Jun. 22, 2023.
Claims priority of application No. 2130370-6 (SE), filed on Dec. 17, 2021.
Int. Cl. G01L 5/24 (2006.01); B25B 23/145 (2006.01)
CPC G01L 5/24 (2013.01) [B25B 23/1456 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method for determining a tightening class of a tightening operation performed by a tightening tool, the method comprising:
acquiring time-domain representations of sets of observed torque and angle values for fasteners having been tightened by the tightening tool;
acquiring frequency-domain representations of the observed sets of torque values for the fasteners having been tightened by the tightening tool;
associating a tightening class with each acquired time-domain representation of the sets of observed torque and angle values and each acquired frequency-domain representation of the sets of observed torque values, the tightening class identifying a type of tightening operation having been applied to the fasteners;
training a machine-learning model with the acquired time-domain representations of the sets of observed torque and angle values, the acquired frequency-domain representations of the sets of observed torque values and the tightening class associated with each set; and
supplying the trained machine-learning model with a further acquired time-domain representation of a set of observed torque and angle values and a frequency-domain representation of the further set of observed torque values for a fastener having been tightened by the tightening tool, wherein the trained machine-learning model outputs an estimated tightening class for the supplied set of observed torque and angle values.