JPH0732155A - Welding equipment - Google Patents

Abstract

PURPOSE:To provide the welding equipment capable of positioning materials to be welded with high accuracy and smoothly performing spot welding and arc welding without variance in the quality of an arc weld zone and almost without generating the waiting time of an arc welding robot. CONSTITUTION:The welding equipment is provided with plural gauge posts 3 provided with clamping mechanisms and spot guns 5-10. Electric power is supplied to the spot guns 5-10 via power feeding terminals 11-16 connected by cables 5a-10a and a ground cable 19a of an arc welding power source 19 is connected to an electrode of the spot gun 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for positioning and restraining an object to be welded and for performing spot welding and arc welding on the object to be welded when manufacturing a welded structure made of a relatively thin plate. The present invention relates to a welding device.

[0002]

2. Description of the Related Art Conventionally, for example, when assembling the body side in a vehicle body assembly process of an automobile, each panel such as a rear fender, an inner rear fender, an outer roof rail, an inner roof rail, a front pillar, and a cowl side is equipped with a clamp device. In addition, a large number of gauge posts were used to position the fixture post on the fixture base and then clamped at that position, and a spot welding robot and an arc welding robot were used to weld the respective predetermined spots. The arc welding power supply ground cable is connected to the fixture base.Therefore, the switching posts equipped with the bearing mechanism part of the gauge posts should be provided with an insulating plate to prevent ground current from flowing through the posts. Was there.

[0003]

However, in the above-mentioned conventional welding method, the spot welding robot has to weld each welding portion while avoiding each gauge post, so that the workability is not good and the spot welding robot is not good. Since the welding robot and the arc welding robot interfere with each other, the spot welding robot performs the arc welding after welding the nearby welding points, which causes a waiting time and a time loss in the arc welding robot. There is a point. Further, the insulating plate provided to insulate the switching post is made of Bakelite or the like, and since both have compressibility, the accuracy of the gauge deteriorates, and the flow of the earth current during arc welding is not constant. Therefore, there is a problem that the welding quality varies depending on the welded part, and the solution of these problems has been a problem in work efficiency or quality in the car body assembly process of automobiles.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in a conventional welding apparatus. It is unnecessary to insulate the gauge post, the positioning accuracy of the workpiece is high, and the quality of the arc welded portion is improved. An object of the present invention is to provide a welding apparatus that can perform spot welding and arc welding smoothly with little variation and little waiting time of the arc welding robot.

[0005]

A welding device according to the present invention is a welding device for performing spot welding and arc welding on an object to be welded, and is a plurality of devices for clamping the object to be welded at a predetermined position on a base. Gauge post, a plurality of spot guns for spot welding at a plurality of points on the workpiece, and power supply terminals for connecting to each electrode of the spot gun through a cable and energizing the electrodes. With, characterized in that it is configured to connect the ground cable of the power source for arc welding to at least one of the electrodes of the plurality of spot guns,
The structure of such a welding device serves as a means for solving the above-mentioned conventional problems.

[0006]

In the welding device according to the present invention,
The ground cable of the arc welding power source is connected to one of the electrodes of the spot gun, and after the welding by the spot gun is completed, the arc welding is performed by the arc welding robot with the electrode being pressurized. The ground current at the time of welding flows to the ground cable through the welded portion by the spot gun, and the current does not flow to the gauge post, so that it is not necessary to insulate the gauge post and the accuracy of the gauge surface is improved. Further, as a result, the earth current path is stabilized, so that the welding quality of the arc welded portion does not vary.

Further, during spot welding, after the welded portion is pressed by the spot gun, power is supplied to the electrode of the spot gun through the power supply terminal, so that the electrode terminal is appropriately separated from the arc welding robot. By arranging it in a position, the movement of the arc welding robot is restricted even if the spot welding and the arc welding are performed in parallel after the grounding path of the arc welding current is secured by the first spot welding. Will disappear.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings.

1 and 2 show an embodiment of a welding apparatus according to the present invention. FIG. 1 shows a welding apparatus for assembling a body side in a vehicle body assembling process. FIG. 3 is an overall view showing a structure and a procedure for restraining a workpiece.

In FIG. 1, a welding apparatus 1 is provided with a total of 18 gauge posts 3 on a base 2 in this embodiment. Each of the gauge posts 3 has a clamp device and is a body to be welded. Panels such as a rear fender, a roof rail, and a front pillar that form the side 4 are accurately positioned on the base 2 and clamped at that position.

Further, the welding apparatus 1 is provided with a total of six spot guns 5 to 1 on the base 2 in this embodiment.
0, and the first to fourth spot guns 5,
6, 7, and 8 are arranged to perform spot welding on the rear fender portion of the body side 4 and to the side sill panel portion of the body side 4 by the fifth and sixth spot guns 9 and 10, respectively.

These first to sixth spot guns 5-5
Both electrodes of 10 are connected to the first to sixth feeding terminals 11 to 16 via cables 5a to 10a, respectively.

Of the power supply terminals 11 to 16, the first power supply terminal 11 has an insulator 11c interposed between upper and lower two metal plates 11a and 11b as shown in FIG. The metal plates 11a and 11b are connected to both electrodes of the first spot gun 5 via cables 5a and 5a, respectively, and the welding spot on the body side 4 is pressed by both electrodes of the spot gun 5 in a state of being pressed. The electrodes 11 and 17 of the spot welding robot pressurize the metal plates 11a and 11b to supply electric power to the welding spots so that the welding spots are energized, whereby the welding at the spots is performed.

As for the other power supply terminals 12 to 16,
It has the same structure as the first power supply terminal 11 and is similarly connected to both electrodes of the corresponding spot guns 6 to 10, and the first to sixth power supply terminals 11 to 11 are connected to the electrodes.
16 are collectively arranged outside the operating range of the arc welding robot 18 and apart from the body side 4 which is the object to be welded.
Furthermore, the spot welding robot does not interfere with the movement of the arc welding robot 18.

Further, a ground cable 19a of a welding power source 19 of the arc welding robot 18 is connected to one electrode of the first spot gun 5 of the six spot guns 5 to 10. .

The process of performing spot welding and arc welding on the body side 4 using the welding apparatus 1 having the above structure will be described below.

First, the gauge posts 3 of the welding apparatus 1 are used to position the individual panels constituting the body side 4 at predetermined positions, and the cylinders provided for the gauge posts 3 are operated to move the panels. Clamp each panel in place.

Next, the pressurizing cylinders of the spot guns 5 to 10 are operated to pressurize each spot welding spot by the electrode of each spot gun. During this time, the spot welding robot approaches the first power supply terminal 11.

Next, both electrodes 1 of the spot welding robot
7, 17 are metal plates 11a, 1 of the first power supply terminal 11
By pressurizing 1b in the manner of welding and supplying power,
A current flows between the electrodes of the first spot gun 5, and spot welding is performed on the relevant portion. During this time, the arc welding robot 18 approaches a predetermined arc welding location indicated by an arrow A in FIG.

Then, in a state where the welding spot by the first spot gun 5 is kept pressurized, the arc welding robot 18 performs arc welding at four locations (plug welding).
Is started. The welding current at this time flows from the welding spot of the first spot gun 5 through the electrode of the spot gun 5 to the earth cable 19a of the arc welding power source 19, so that the earth current path is stable. The quality of the arc welded part is eliminated, and the welding current does not flow to the gauge post 3 without insulation treatment, so the gauge surface accuracy is improved.
The dimensional accuracy of the product can be improved.

Thereafter, the spot welding robot pressurizes the second to sixth power supply terminals 12 to 16 to supply electric power in a manner to weld the terminals 12 to 16, and the second to sixth spot guns 6 are supplied. 10 to 10 are sequentially performed, and the arc welding robot 18 performs arc welding. At this time, the spot welding robot only needs to sequentially supply electric power while pressurizing the power supply terminals 11 to 16 arranged collectively, so that workability is improved and there is no interference with the arc welding robot. Welding and arc welding can be performed at the same time,
The operating rates of both welding robots are significantly improved.

[0022]

As described above, since the welding apparatus according to the present invention has the above-mentioned structure, the earth current during arc welding flows from the spot welding portion to the earth cable through the electrode of the spot gun. As a result, stable welding is possible and there is no need to perform insulation treatment on the gauge post, so welding quality and dimensional accuracy are improved, and spot welding and arc welding can be performed almost in parallel. It has an excellent effect that the welding time can be shortened.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a structure of a welding apparatus for assembling a vehicle body side and a restrained state of an object to be welded as an embodiment of a welding apparatus according to the present invention.

FIG. 2 is a schematic diagram showing a structure of a power supply terminal of the welding apparatus shown in FIG. 1 and a connection state with a spot gun.

[Explanation of symbols]

 1 Welding device 2 Base 3 Gauge post 4 Body side (workpiece) 5, 6, 7, 8, 9, 10 Spot gun 5a, 6a, 7a, 8a, 9a, 10a Cable 11, 12, 13, 14, 15 , 16 Power supply terminal 19 Power source for arc welding 19a Ground cable

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area B62D 65/00 Q

Claims (1)

[Claims] 1. A welding device for performing spot welding and arc welding on an object to be welded, comprising: a plurality of gauge posts for clamping the object to be welded at predetermined positions on a base; and a plurality of points on the object to be welded. A plurality of spot guns for respectively performing spot welding, and each of the electrodes of the spot guns are respectively connected via a cable, and a power supply terminal for energizing the electrodes is provided. A welding device, characterized in that at least one ground cable of a power source for arc welding is connected.