Device for controlling tapping device provided with composite tool having boring and tapping sections
AssigneeBrother Kogyo Kabushiki Kaisha
InventorKatsunori Tsutsui
Life of this patent
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Abstract
A control device which controls a tapping device provided with a feed motor for feeding a spindle in an axial direction thereof and a spindle motor for rotating the spindle about its axis. The spindle installs a composite tool having a boring section for forming a bore in a workpiece and a subsequent tapping section for forming a female thread at the bore. An asynchronous control is initially performed for independently controlling rotation of the feed motor and the spindle motor for boring. If the tapping section reaches the workpiece, a control is switched to a synchronous control for controlling the motors in synchronism with each other.
Claims21
A control device for controlling a tapping device for forming a female thread in a workpiece, the tapping device including:
- a composite tool having a boring section and a tapping section axially aligned therewith;
- a spindle rotatable about its axis and movable in an axial direction thereof, the composite tool being attached to the spindle with the boring section being a tip end;
- rotation drive means that rotates the spindle about its axis;
- and
- feed drive means that moves the spindle in the axial direction toward and away from the workpiece, the female thread being formed in the workpiece in a going stroke of the composite tool and the composite tool is separated from the workpiece in a return stroke thereof;
- the control device comprising:
- asynchronous control means that controls the rotation drive means and the feed drive means independently of each other;
- synchronous control means that control the rotation drive means and the feed drive means in synchronism with each other;
- and
- change-over control means for first controlling the asynchronous control means to control said rotation drive means and said feed drive means to form a bore in the workpiece by the boring section of the composite tool, and for then controlling the synchronous control means to control the rotation drive means and the feed drive means to form the female thread at the bore by the tapping section of the same composite tool by the time the tapping section reaches the workpiece.
A control device for forming a bore in a workpiece and then for forming a female thread at the bore in the workpiece, the device comprising:
- a spindle rotatable about its axis and movable in an axial direction thereof;
- a composite tool attached to the spindle, the composite tool having a boring section and a tapping section axially aligned therewith, the composite tool being attached to the spindle with the boring section being a tip end;
- rotation drive means that rotates the spindle about its axis;
- feed drive means that moves the spindle in the axial direction toward and away from the workpiece;
- asynchronous control means that controls the rotation drive means and the feed drive means independently of each other;
- synchronous control means that controls the rotation drive means and the feed drive means in synchronism with each other;
- and
- change-over control means for first controlling the asynchronous control means to control the rotation drive means and the feed drive means to form the bore in the workpiece by the boring section of the composite tool in a going stroke of the composite tool, and then, by the time the tapping section reaches the workpiece, controlling the synchronous control means to control the rotation drive means and the feed drive means to form the female thread at the bore by the tapping section of the same composite tool, the female thread being formed at the bore by the tapping section of the composite tool also in the going stroke of the composite tool and the composite tool being separated from the workpiece in a return stroke thereof.
Dependencies are inferred from the claim text.