Screw tightening control system and screw tightening control method
First Claim
1. A screw tightening control system comprising:
- a plurality of screw tightening apparatuses; and
a control apparatus configured to set a synchronization point after tightening torques of all of the plurality of screw tightening apparatuses are changed to an equal tightening torque, and to change the tightening torques of the plurality of screw tightening apparatuses, step by step from the synchronization point,wherein the control apparatus starts changing the tightening torque of at least one of the plurality of screw tightening apparatuses from the synchronization point at a timing different from that of starting changing the tightening torque of at least another one of the plurality of screw tightening apparatuses from the synchronization point.
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Abstract
The screw tightening control system includes plural screw tightening apparatuses, and a control apparatus that sets a synchronization point after completion of changing tightening torques of the plural screw tightening apparatuses in a current step, and starts changing of the tightening torques of the plural screw tightening apparatuses in a next step, step by step from the synchronization point. The control apparatus causes a timing to start the changing of the tightening torque of at least one of the plural screw tightening apparatuses from the synchronization point to differ from a timing to start the changing of the tightening torque of at least another one of the plural screw tightening apparatuses. The system controls the plural screw tightening apparatuses while synchronizing them so as to avoid the inconveniences in a conventional art by a simple method.
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Citations
7 Claims
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1. A screw tightening control system comprising:
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a plurality of screw tightening apparatuses; and a control apparatus configured to set a synchronization point after tightening torques of all of the plurality of screw tightening apparatuses are changed to an equal tightening torque, and to change the tightening torques of the plurality of screw tightening apparatuses, step by step from the synchronization point, wherein the control apparatus starts changing the tightening torque of at least one of the plurality of screw tightening apparatuses from the synchronization point at a timing different from that of starting changing the tightening torque of at least another one of the plurality of screw tightening apparatuses from the synchronization point. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A screw tightening control method configured to change tightening torques of a plurality of screw tightening apparatuses step by step while synchronizing them, the method comprising the steps of:
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setting a synchronization point for the plurality of screw tightening apparatuses after tightening torques of all of the plurality of screw tightening apparatuses are changed to an equal tightening torque; and starting changing the tightening torque of at least one of the plurality of screw tightening apparatuses from the synchronization point at a timing different from that of starting changing the tightening torque of at least another one of the plurality of screw tightening apparatuses.
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Specification