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US 12,343,786 B2Granted
Method and device for monitoring and/or control of a flow-hole and thread-forming process
AssigneeAtlas Copco IAS GmbH
InventorsMichael Ludsteck, Manuel Guglhör
Life of this patent
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Abstract
A method and a device are provided for simplifying a flow-hole screw process, in which the difference between a process parameter and its smoothed value is employed as a criterion for changing said process parameter or another process parameter in order in particular to be able to determine the changeover point between hole forming and thread forming.
Claims16
A method for controlling a flow-hole and thread-forming process in which a fastener is driven through a workpiece with a rotation speed (N), a torque (M), and a feed force (F) over a penetration depth (Z), the method comprising:
- a) measuring a process parameter (R(t)) of the flow-hole and thread-forming process;
- b) determining a smoothed curve (R*(t)) of the process parameter (R(t));
- c) determining a difference (D(t)) of the process parameter (R(t)) and its smoothed curve (R*(t)), D(t)=R(t)−R*(t);
- and
- d) changing a process parameter of the flow-hole and thread-forming process based on the difference (D(t)),
- wherein the process parameter (R(t)) is formed based on at least one of:
- the rotation speed (N), the torque (M), the feed force (F), and the penetration depth (Z).
4 more elements
A joining device comprising:
- a controller configured to control one or more components for performing a flow-hole and thread-forming process in which a fastener comprising a flow-hole screw is driven through a workpiece with a speed (N), a torque (M), and a feed force (F) over a penetration depth (Z), the controller configured for:
- issuing and receiving signals concerning the rotation speed (N), the torque (M), and the penetration depth (Z) of the flow-hole screw into the workpiece;
- measuring a process parameter (R(t)) of the flow-hole and thread-forming process;
- determining a smoothed curve (R*(t)) of the process parameter (R(t));
- determining a difference (D(t)) of the process parameter (R(t)) and its smoothed curve (R*(t)), D(t)=R(t)−R*(t);
- and
- based on the difference (D(t)), altering at least one of:
- the rotation speed (N), the feed force (F), and the torque (M),
- wherein the process parameter (R(t)) is formed based on at least one of:
- the rotation speed (N), the torque (M), the feed force (F), and the penetration depth (Z).
7 more elements
Dependencies are inferred from the claim text.