Tool driving or impacting – Processes
Patent
1989-09-11
1992-06-02
Watts, Douglas D.
Tool driving or impacting
Processes
173177, 7386223, G01L 524, B23Q 1512
Patent
active
051179199
ABSTRACT:
An air tool torque control system includes a controller operative to independently control two air tools with continuous programmed adjustment of the torque shut off point for each tool after each fastener joint is made. The torque specification is measured for each fastener joint made, is verified as being within an acceptable torque range, is compared to the set point of that torque specification range to determine the variation therebetween, and is then adjusted toward the mid point by the applicable correction factor for the variation determined to continuously compensate for variations in joint rate, line pressure and/or tool output. To enhance the effectiveness of the system, fast acting solenoid valves utilizing line pressure to assist in valve closure may be included to improve shut off control. Torque select devices may also be included at the assembly station to allow selective switching of each tool to preprogrammed discrete torque ranges for specific fastener applications performed at that station.
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"2- and 3-way solenoid pilot and remote air pilot in line" Mac Valves, Inc. May, 1986.
Borries John A.
Jarc Dennis A.
Smith Scott A.
The Rotor Tool Company
Watts Douglas D.
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