Method of controlling electrode force of spot welding gun
First Claim
1. A method of controlling an electrode force of a spot welding gun, said spot welding gun comprising:
- a gun main body;
a stationary electrode tip which is immovable relative to said gun main body; and
a movable electrode tip which is opened and closed by a pressing source relative to said stationary electrode tip, said gun main body being movable relative to a gun support bracket by a driving source in a direction in which both said electrode tips lie opposite to each other, said method comprising the steps of;
controlling said pressing source such that said movable electrode tip is moved by said pressing source from an open position in a closing direction of approaching a workpiece to thereby bring said movable electrode tip into contact with the workpiece and, therefore, that a predetermined electrode force is obtained; and
controlling said driving source such that a difference between an electrode force of said stationary electrode tip to the workpiece and the electrode force of said movable electrode tip to the workpiece at the time of pressing the workpiece becomes substantially zero.
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Accused Products
Abstract
In a spot welding gun which is made up of a gun main body which is operated for equalization by a driving source, a stationary electrode tip which is immovable relative to the gun main body, and a movable electrode tip which is connected to a pressing source, both electrode tips are pressed to a workpiece with an even force, to thereby perform a high quality spot welding. The driving source is controlled such that the electrode force of the stationary electrode tip, by the driving source, to the workpiece becomes substantially zero. In this manner, there occurs no difference in the electrode forces by both the electrode tips to the workpiece.
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Citations
7 Claims
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1. A method of controlling an electrode force of a spot welding gun, said spot welding gun comprising:
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a gun main body; a stationary electrode tip which is immovable relative to said gun main body; and a movable electrode tip which is opened and closed by a pressing source relative to said stationary electrode tip, said gun main body being movable relative to a gun support bracket by a driving source in a direction in which both said electrode tips lie opposite to each other, said method comprising the steps of; controlling said pressing source such that said movable electrode tip is moved by said pressing source from an open position in a closing direction of approaching a workpiece to thereby bring said movable electrode tip into contact with the workpiece and, therefore, that a predetermined electrode force is obtained; and controlling said driving source such that a difference between an electrode force of said stationary electrode tip to the workpiece and the electrode force of said movable electrode tip to the workpiece at the time of pressing the workpiece becomes substantially zero. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification