Power-impact or pulse screwing method
First Claim
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1. A method for tightening a screw, comprising the steps of:
- applying individual torque pulses to the screw via one of a power impact driver and a pulse driver, thereby tightening the screw in a step-by-step manner;
detecting, via an ultrasound echo-time measurement, at least one screwing parameter as a physical quantity indicating deformation of the screw; and
switching-off the one of the power impact driver and the pulse driver as a function of the detected at least one screwing parameter when the at least one screwing parameter indicates a change in the physical response of the screw.
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Abstract
A method for tightening a screw utilizes a power-impact or pulse driver. The prestressing force in the screw to be tightened is increased step-by-step during the tightening operation and evaluated. By detecting the prestressing force in the screw on a step-by-step basis, the step heights pertaining to the increase in the prestressing force and the change in the step heights are used as criteria for the screw-coupling quality and for controlling the screw-coupling operation. In the same way, the number of impacts or pulses is also used as a criterion for the screw-coupling quality and for controlling the screw-coupling operation.
29 Citations
9 Claims
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1. A method for tightening a screw, comprising the steps of:
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applying individual torque pulses to the screw via one of a power impact driver and a pulse driver, thereby tightening the screw in a step-by-step manner; detecting, via an ultrasound echo-time measurement, at least one screwing parameter as a physical quantity indicating deformation of the screw; and switching-off the one of the power impact driver and the pulse driver as a function of the detected at least one screwing parameter when the at least one screwing parameter indicates a change in the physical response of the screw. - View Dependent Claims (2, 3, 4)
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5. A screwing device for tightening a screw, comprising:
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one of a power-impact and a pulse driver for applying a number of individual torque pulses to the screw, thereby tightening the screw in a step-by-step manner; an ultrasound echo-time measurement sensor, connected to one of the Dower-impact driver and the pulse driver, for measuring a pre-stressing force on the screw; and a control unit connected to one of the power-impact driver and the pulse driver, the control unit including a computing device for determining a switch-off value for switching-off the one of the power-impact driver and the pulse driver when the pre-stressing force indicates a change in physical response of the screw, and an input device for receiving the switch-off value and at least one data output. - View Dependent Claims (6, 7, 8, 9)
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Specification