JPH0446678A - Resistance welding equipment - Google Patents

Abstract

PURPOSE:To accurately position respective electrodes without spending time by providing an electrode adjusting means to project a couple of electrodes by the working quantity after dressing is completed. CONSTITUTION:When resistance welding is performed repeatedly, the tips of the respective electrodes 19 and 20 generate pickups and further deform. As a result, the tips of the respective electrodes 19 and 20 are dressed periodically. At the time of this dressing, a dressing base 42 is placed on a theta table 13. When the electrodes 19 and 20 are then lowered and brought into contact with the dressing base 42, the theta table 13 is rotated and the tips of the electrodes 19 and 20 are shaped and the lengths of the electrodes 19 and 20 are shortened. A command to project the electrodes 19 and 20 by the working quantity is then issued to the electrode adjusting means and the electrodes 19 and 20 are moved by the working quantity.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention provides a method of interposing a wire between a positive electrode and a member to be welded out of a pair of electrodes consisting of a positive electrode and a ground electrode. The present invention relates to a resistance welding device that welds a wire to a workpiece using resistance heat.

(Conventional technology) FIG. 5 is a schematic diagram of the resistance welding device.

The welding head 1 is composed of a pair of a positive electrode 2 and a ground electrode 3. These electrodes 2.3 are arranged in parallel at a predetermined interval and are raised and lowered by a lifting mechanism (not shown). A rotary table 4 is provided below the welding head 1, and a member to be welded 5 is placed on the rotary table 4.

When performing resistance welding with such a configuration, each of the electrodes 2 and 3 is lowered and pressed against the member to be welded 5, and the wire 6 is interposed between the positive electrode 2 and the member to be welded 5. When a voltage is applied between each electrode 2 and 3 in this state, a current flows from the positive electrode 2 to the welded member 5 and the earth electrode 3. This current generates heat between each electrode 2.3 and the member to be welded 5, and the wire 6 is deformed and melted by this heat and welded to the member to be welded 5. Thereafter, the welding head 1 is raised by the lifting mechanism.

If the above resistance welding is repeated, the tip of each electrode 2.3 may be picked up or deformed. For this reason, the tips of each electrode 2, 3 are regularly dressed. For this dressing, a dressing table is placed on the rotary table 4, and the welding head 1 is lowered. Then, the rotary table 4 is rotated with each electrode 2°3 in contact with the dressing table. The tip of each electrode 2.3 is thus shaped.

By the way, when this dressing is performed, each electrode 2.
The tip of 3 is shaved off to shorten its length.

For this reason, after finishing the dressing, each electrode 2, 3 is pulled out and adjusted by the length removed by the dressing. For this adjustment, the welding head 1 is loosened, each electrode 2, 3 is pulled out and positioned, and the welding head 1 is fixed. Therefore, since each electrode 2.3 must be accurately positioned, adjustment takes time.

(Problem to be solved by the invention) As described above, each electrode 2, 3 after dressing is finished.
Since the adjustment requires accurate positioning, it takes time.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a resistance welding device that can accurately adjust each electrode after finishing dressing without taking much time.

[Structure of the Invention (Means for Solving the Problems) The present invention provides a method in which a wire is interposed between a positive electrode and a member to be welded out of a pair of electrodes consisting of a positive electrode and a ground electrode. In a resistance welding device that welds a wire to a workpiece by the heat generated by passing an electric current between the workpiece and the workpiece, the amount to be processed by dressing a pair of electrodes is set in advance, and after dressing the pair of electrodes is This is a resistance welding device that attempts to achieve the above object by including an electrode adjustment means that protrudes by the same amount.

(Function) By providing such a means, the pair of electrodes descends during resistance welding to come into contact with the welded member, and rises after the resistance welding is completed. When these electrodes are dressed, after the dressing is finished, each electrode is protruded by the amount processed by the dressing by the electrode adjustment means.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is an overall configuration diagram of a resistance welding device. An operation panel 11 is provided on the pedestal 10. Also, there is an X on the pedestal 10.
A Y table 12 is provided, and a θ table 13 is provided on this XY table 12. This θ table 13
A work clamp mechanism 14 is provided above, and a workpiece 15 to be welded is fixed by this work clamp mechanism 14.

On the other hand, a welding head 16 is provided above the member 15 to be welded. This welding head 16 is movable along a slide mechanism 17 and is designed to move up and down relative to the workpiece 15 to be welded. As shown in FIGS. 2 and 3, a positive electrode 19 and a ground electrode 20 are arranged side by side at the tip 18 of the welding rod 17 at a predetermined interval. Further, a cutter mechanism 21 is provided on the side surface of the welding head 16. This cutter mechanism 21 moves a cutter 22 forward and backward relative to the tip end 18 of the welding head 16 from diagonally above.

Further, a wire bobbin 23 is provided on the pedestal 10. The wire 24 wound around the wire bobbin 23 is fed to the tip 18 of the welding head 16 by a wire supply mechanism 25.
are supplied in fixed lengths.

The welding head 16 is also provided with a visual recognition camera 26 . This visual recognition camera 26 is provided with its field of view facing downward, and is configured to take an image of the welded member 15 and output the image signal.

The operation of this visual recognition camera 26 is controlled by a recognition control device 27, and the output image signal is subjected to image processing and sent to a monitor television 28.

By the way, as shown in FIG. 2, a front clamper 29 is arranged between each electrode 19.degree. 20 and the cutter 22.

The front clamper 29 is disposed so as to be openable and closable, and to be movable up and down. Further, a rear clamper 30 is arranged on the opposite side of each electrode 19, 20 to the side where the front clamper 29 is arranged.

After this, a guide nozzle 31 for the wire 24 is provided protruding from the tip of the clamper 30. Further, each electrode 19, 20 is provided with an electrode lifting mechanism (not shown) inside the welding head 16.

A main control device 32 is provided below the gantry IO.

As shown in FIG. 4, this main control device 32 has a configuration in which the following devices are operated by a control circuit 33 consisting of a CPU. That is, the head moving device 34 moves the welding head 1
6 along the slider 17, the front clamper elevating device 35 has the function of elevating the front clamper 29, and the cutter elevating device 36 has the function of moving the cutter 22 forward and backward in the direction of arrow (A). It has the following. The front clamper drive device 37 has a function of driving the front clamper 29 to open and close, and the rear clamper drive device 38 has a function of driving the rear clamper 30 to open and close. Welding power source 3
9 is a positive electrode 19 and a ground electrode 20 as shown in FIG.
and receives a supply command from the control circuit 33 to supply DC power between each electrode 19 and 20. The rotary table driving device 40 has a function of rotating the θ table 13 by a specified angle or at a predetermined number of rotations. Then, the electrode driving device 41 drives the electrode lifting mechanism of each electrode 19.20 to
9.20 has the function of finely moving the length.

The control circuit 33 performs an electrode adjustment in which the processing amount Q of each electrode 19.20 by dressing is set in advance, and after the dressing is finished, it issues a command to the electrode drive device 41 to protrude each electrode 19.20 by the processing amount Q. It has a function.

Next, the dressing action of the device configured as described above will be explained.

When resistance welding is repeated, the tips of the electrodes 19 and 20 may be picked up or deformed. For this reason,
The tip of each electrode 19,20 is dressed periodically. When performing this dressing, a dressing table 42 is placed on the θ table 13. In this state, the welding head 16 is lowered under the control of the head moving device 34. When each electrode 19, 20 contacts the dressing table 42 with a predetermined pressure, the θ table 13 is rotated by the rotary table driving device 40. Thus, the tip of each electrode 19, 20 is processed and shaped.

When the dressing is finished, the rotation of the θ table 13 is stopped and the welding head 16 is raised.

By the way, when the tips of each electrode 19.20 are processed and shaped, the length of these electrodes 19.20 becomes shorter.

Since this machining length is dressed for a predetermined period of time, the machining amount is always a constant amount Q.

Therefore, when the welding head 16 has finished rising, the electrode drive device 41 issues a command to the electrode elevating mechanism to protrude each electrode 19, 20 by the set processing amount Q. This electrode lifting mechanism moves each electrode 19, 20 by a processing amount Q.

Thereafter, the workpiece 15 to be welded is placed on the θ table 13, and in this state, each electrode 19.2 is moved by the head moving device 34.
0 descends and is pressed into contact with the member 15 to be welded. At the same time, a predetermined length of the wire 24 is supplied by the wire supply mechanism 25 between the positive electrode 19 and the member to be welded. In this state, each electrode 19. ．． 20, a voltage is applied from the welding power source 39, and current flows from the positive electrode 19 to the welded member 15 and the ground electrode 20. This current generates heat between each electrode 19 , 20 and the member to be welded 15 , and the wire 24 is deformed and melted by this heat and welded to the member to be welded 15 . After this, the welding head 16 rises.

In the above-mentioned embodiment, when the positive electrode 19 and the ground electrode 20 are dressed, each electrode 19.2 is adjusted by the electrode adjustment function after the dressing is finished.
0 protrudes by the processing amount Q due to dressing, so each electrode 19 is automatically removed after dressing is finished.
．． 20 can be projected and positioned. Therefore, the positioning adjustment of each electrode 19, 20 after finishing the dressing can be done accurately without taking much time.

Note that the present invention is not limited to the above-mentioned embodiment, and may be modified without departing from the spirit thereof. For example, each electrode 19, 20 is made to protrude after finishing dressing, but the amount of descent by the head moving device 34 during resistance welding may be further lowered by the processing amount Q due to dressing.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide a resistance welding device that allows accurate adjustment of each electrode after finishing dressing without taking much time.

[Brief explanation of the drawing]

1 to 4 are diagrams for explaining one embodiment of a resistance welding device according to the present invention, in which FIG. 1 is an overall configuration diagram, and FIGS. 2 and 3 are configurations of a welding head tip. 4 are block diagrams of the main control device, and FIG. 5 is a diagram for explaining the prior art. 10... Frame, 11... Operation panel, 12... XY child table 2.13... θ table, 14... Work clamp mechanism, 15... Welded member, 16... Welding Head, 17... Slide mechanism, 19... Positive electrode, 20... Earth electrode, 21... Cutter mechanism, 2
2... Cutter 23... Wire bobbin, 24...
Wire, 25... Wire supply mechanism, 26... Visual recognition camera, 27... Recognition control device, 29... Front clamper, 30... Rear clamper, 31... Guide nozzle, 32...・Main control device, 33...control circuit, 34・
...head moving device, 35...front clamper lifting device,
36... Cutter lifting device, 37... Front clamper drive device, 38... Rear clamper drive device, 39... Welding power source, 40... Rotary table drive device, 41...
Electrode drive device.

Claims (1)

[Claims] Of a pair of electrodes consisting of a positive electrode and a ground electrode, a wire is interposed between the positive electrode and the member to be welded, and a current is passed between the pair of electrodes and the member to be welded to generate heat. A resistance welding device for welding a wire to the workpiece to be welded, comprising an electrode adjustment means for presetting an amount of processing by dressing the pair of electrodes and causing the pair of electrodes to protrude by the amount of processing after the dressing is finished. A resistance welding device characterized by: