JP2002086268A - Equipment and method for welding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain satisfactory weld quality by preventing vibrations at the time of a high speed travel in equipment having two electrodes to one weld line and welding while alternately energizing the electrodes. SOLUTION: Restraint rollers 8, 9 pressing a work 1 and a welding torch 10 having two electrodes, are hung on a welding head 5 hung from a travelling device 4. The restraint rollers 8, 9 are freely ascendably and descendably hung on the frame 5A of the welding head 5 through air cylinders 12, 12. The restraint rollers 8, 9 are freely ascendable and descendable in a straight line with linear guides 13, 13. The welding torch 10 is freely ascendably and descendably hung on the frame 5A. The welding torch 10 is connected to the restraint roller 8 through stays 11A, 11B. When the welding torch 10 is vibrated, its vibrations are absorbed with the elasticity of the air cylinder 12, and the welding in restraint travel can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding device having a traveling device equipped with two electrodes for one welding line, and a welding device for alternately energizing and welding the electrodes.

[0002]

2. Description of the Related Art A traveling device provided with a welding torch is provided above a workpiece, and welding is performed while the traveling device is traveling. The traveling device is configured to press rollers before and after the welding line of the workpiece. The roller is elastically supported by an air cylinder.

[0003] Two electrodes are provided for one welding line,
There is a welding apparatus that performs welding by energizing the electrodes alternately.

[0004]

It is strongly desired to increase the welding speed as well as automation in order to improve productivity. However, in a welding device that includes two electrodes for one welding line and alternately energizes and welds the electrodes, the traveling device vibrates during traveling, and welding defects are likely to occur. In particular, the vibration generated at the start is large, which is a major cause of poor welding. For this reason, the welding speed could not be increased.

It is an object of the present invention to increase the welding speed in a welding apparatus in which two electrodes are alternately energized and welded.

[0006]

SUMMARY OF THE INVENTION The present invention is characterized by absorbing vibration during traveling by elastically supporting two electrodes.

[0007]

1 to 4 show an embodiment of the present invention.
This will be described below. The work 1 is a long material, and is, for example, an extruded aluminum alloy material forming the body of a railway vehicle. The length of the work 1 is the same as the length of the vehicle body. The work 1 is fixed to a restraining jig 2 and performs butt welding from the upper surface along a welding line 3 in the longitudinal direction of the work 1. A portal-shaped traveling body 4 having a plurality of welding heads 5 straddling the workpiece 1 travels on a traveling rail 6 provided in the longitudinal direction of the workpiece 1 to perform welding. The welding head 5 is provided with a sensor 7 for detecting the position of the groove, restraining rollers 8 and 9 for pressing the work 1 downward, and a welding torch 10.

The sensor 7 detects the position of the groove and causes the welding head 5 to follow the groove position. The restraining rollers 8 and 9 are provided before and after the welding torch 10 in the running direction. Each of the restraining rollers 8 and 9 includes a plurality of rollers 15. At the end of the welding line there is a tab 14 for supporting the restraining roller 8 and keeping the welding torch 10 at a predetermined height. A groove is provided at the center of the roller 15 of the restraining rollers 8, 9 in order to prevent vibration caused by the restraining rollers 8, 9 riding on the tacking beads 14, which are provided before welding for restraining and dimensioning. ing. Since the roller 15 is heated to a high temperature by the arc heat during welding, the housing 17 supporting the roller 15 is water-cooled. 1
Reference numeral 8 denotes a cooling water passage. Roller 15, housing 17
Is made of a copper alloy having high thermal conductivity and high hardness.

The restraining rollers 8 and 9 are air cylinders 12 and
12 hangs from the frame 5A of the welding head 5. The restraining rollers 8, 9 are also connected to linear guides 13, 13 installed on the frame 5A. For this reason,
By the operation of the air cylinders 12, 12, the constraining rollers 8, 9 move up and down linearly. Further, the restraining rollers 8 and 9 can be slightly moved up and down by the air cylinders 12 and 12.

The welding torch 10 has a restraining roller 8 in front of it.
Are connected via stays 11A and 11B. The welding torch 10 is installed on the frame 5A so as to be able to move up and down. When the stays 11A and 11B are combined, they are L-shaped. Therefore, the welding torch 10 is synchronized with the lifting and lowering of the restraining roller 8. The welding torch 10 has two welding torches.
In this method, two electrodes are provided, and the electrodes are alternately energized and welded. The electrodes are before and after the welding direction.

In such a configuration, in welding, the restraining rollers 8 and 9 are lowered by the air cylinders 12 and 12 to press the work 1. The welding torch starts to vibrate due to the start of welding by the welding torch 10.
Is supported by the air cylinder 12
Is absorbed or suppressed by Therefore, good welding can be performed at high speed.

When the tab 13 is not provided, the following is performed. 5 to 7, the welding torch 10 is selectively connected to the frame 5A or the restraining roller 8 (stay 11A). That is, the connection portion of the welding torch 10 is switched between the constraint roller 8 and the frame 5A of the welding head 5. The connection between the welding torch 10 and the frame 5A is performed by providing a pin cylinder 20 on a stay 11B.
The pin cylinder 20 is provided on the stay 11B. The tip of the rod of the pin cylinder 20 can enter the hole of the frame 5A. When the rod enters the hole of the frame 5A,
The stay 11B cannot be moved up and down with respect to the frame 5A and is fixed.

The welding torch 10 and the restraining roller 8 (stay 1)
1A) is provided by providing a pin cylinder 19 on the stay 11B. The pin cylinder 19 is provided on the stay 11B. The tip of the rod of the pin cylinder 19 can enter the hole of the stay 11A. Rod stay 11
When entering the hole A, the stay 11B and the stay 11A are integrated.

In this configuration, until the welding is completed (until the front restraining roller 8 reaches the position corresponding to the tab 13, that is, until the restraining roller 8 reaches the end of the work 1), the pin cylinder 20 is closed. The rod is retracted, and the rod of the pin cylinder 19 is projected. This results in a state similar to the embodiment of FIGS. The welding torch 5 is in a state of being connected to the restraining roller 8.

When welding is advanced and the front restraining roller 8 is positioned immediately before the end of the work, the rod of the pin cylinder 20 is projected, and the rod of the pin cylinder 19 is retracted. Thereby, welding torch 10 is connected to frame 5A. For this reason, even if there is no work 1 (tab 13) below the front restraining roller 8, the welding torch 10 can maintain a predetermined position and can continue welding.

The pin cylinders 20 and 19 each have two or more pins to prevent the welding torch 10 from rotating around the pins due to its own weight.

[0017]

According to the present invention, good welding can be performed at high speed in arc welding using a traveling automatic welding apparatus.

[Brief description of the drawings]

FIG. 1 is a side view of a welding head according to an embodiment of the present invention.

FIG. 2 is a perspective view near the end of a welding line.

FIG. 3 is a longitudinal sectional view of a roller portion of the restraining roller of FIG.

FIG. 4 is a perspective view of a welding apparatus having the embodiment of FIG. 1;

FIG. 5 is a side view of a welding head according to another embodiment of the present invention.

FIG. 6 is a right side view of FIG.

FIG. 7 is a sectional view taken along the line VII-VII of FIG. 5;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Work, 2 ... Restriction jig, 3 ... Welding line, 4 ... Traveling device, 5 ... Welding head, 7 ... Sensor, 8, 9 ... Restriction roller, 10 ... Welding torch, 11A, 11B ... Connection stay,
12 ... Air cylinder.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tsuyoshi Fujii 794, Higashitoyoi, Katsumatsu-shi, Yamaguchi Prefecture F-term in Kasado Plant, Hitachi, Ltd. (Reference) 4E001 AA03 CB01 DA01 4E081 AA12 BA08 EA22 EA34 EA45 YX02 YY04 YY07 YY14

Claims (5)

[Claims] 1. A welding apparatus comprising a welding head comprising a welding torch having two electrodes for one welding line and a restraining roller for holding a workpiece, wherein the welding head is suspended from a traveling device. A welding apparatus, wherein the welding torch is elastically supported. 2. The welding device according to claim 1, wherein the restraining roller is mounted on the welding head so as to be vertically movable via an air cylinder, and the welding torch is connected to the restraining roller. apparatus. 3. The welding apparatus according to claim 1, wherein the welding torch is provided so as to be selectively connected to a frame of the welding head or the constraint roller. 4. A method of running a traveling device while holding down a workpiece by a restraining roller provided on a welding head suspended from a traveling device toward a workpiece below, and welding the traveling device with a welding torch of the welding head. The welding torch performs welding while alternately energizing two electrodes to one welding line, and performs welding in a state where the welding torch is elastically supported on the welding head. And welding method. 5. The welding according to claim 4, wherein the restraining roller is supported by the welding head so as to be able to move up and down via an air cylinder, and the welding head is connected to the air cylinder. Method.