JP2008030052A - Wire feeding device and arc welding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wire feeding device WF which can select two electrode arc welding or single electrode arc welding corresponding to each welding portion. <P>SOLUTION: The wire feeding device comprises: one feeding motor M; a first feeding roll 61 for feeding a first welding wire 11 and a second feeding roll 62 for feeding a second welding wire 12 by being rotationally driven via a gear unit 5 by the feeding motor M; a first pressing roll 71 and a second pressing roll 72 to be arranged so as to oppose to the first feeding roll 61 and the second feeding roll 62, respectively; and a first pressing mechanism 81 and a second pressing mechanism 82 which are provided to the first pressing roll 71 and the second pressing roll 72 respectively, and can control the ON/OFF of the pressing rolls against the feeding rolls based on the press control signal Pc from the outside. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wire feeding device and an arc welding method for performing consumable electrode arc welding by selecting two electrodes or a single electrode.

[Prior art 1]
In consumable electrode arc welding, a wire feeding device feeds a single welding wire as a single electrode through a welding torch, and feeds the welding wire from a welding power source via a power feed tip. An arc is generated between the materials and welding is performed. At this time, in order to change the type of welding wire, manually pull out the welding wire in the conduit cable of the welding torch, pull out the welding wire from the wire reel to be changed, set it in the wire feeder, and then weld The wire must be pre-fed to the tip of the welding torch. In an automatic welding apparatus using a welding robot or the like, exchanging the welding wire requires that the production line be stopped for a long time, resulting in a decrease in production efficiency. Therefore, even if it is ideal to change the type of the welding wire for each welding location, welding is often performed without replacing the welding wire. Prior art 1 described in Patent Document 1 is a technique for automating the exchange of the welding wire. That is, in the prior art 1, a plurality of types of wire reels are arranged in advance, and a wire feeding / switching mechanism is provided. This wire feeding / switching mechanism cuts the welding wire before replacement, automatically sets the welding wire to be replaced on the feeding part, feeds it to the tip of the welding torch and discharges the welding wire before replacement, Set the welding wire to be exchanged to a weldable state. This automates the replacement of the welding wire, but again the replacement takes a considerable amount of time, limiting the scope of application. Furthermore, since the wire feeding / switching mechanism has a complicated mechanism, there is a problem that the equipment cost is increased.

[Prior Art 2]
FIG. 2 is a configuration diagram of a two-electrode arc welding apparatus showing the related art 2 described in Patent Document 2. In the figure, welding is performed by feeding two welding wires (two electrodes) insulated from each other and generating two arcs back and forth in the welding direction. Hereinafter, a description will be given with reference to FIG.

  The first welding power source PS1 supplies power to the first welding wire 11 via the first power supply tip 41 of the welding torch 4 and controls the rotation to the first feed motor M1. The feed control signal Fc1 is output. The second welding power source PS2 supplies electric power to the second welding wire 12 via the second power feed tip 42 of the welding torch 4 and also controls the second feeding motor M2 for controlling the rotation. The feed control signal Fc2 is output.

  The first feeding motor M1 is decelerated via the first gear unit 51 and rotationally drives the first feeding roll 61. The first pressure roll 71 has a manual pressing mechanism, is disposed opposite to the first feeding roll 61, and is pressed with the first feeding roll 61 when pressed. One welding wire 11 is fed. The first wire feeding device WF1 is configured by the first feeding motor M1, the first gear unit 51, the first feeding roll 61, and the first pressure roll 71.

  The second feed motor M2 decelerates via the second gear unit 52 and rotationally drives the second feed roll 62. The second pressure roll 72 has a manual pressing mechanism, and is disposed opposite to the second feeding roll 62. When the second pressing roll 72 is pressed, the second pressure roll 72 is connected to the second feeding roll 62. Two welding wires 12 are fed. The second wire feeding device WF2 is configured by the second feeding motor M2, the second gear unit 52, the second feeding roll 62, and the second pressure roll 72.

  The first welding wire 11 is fed by the first wire feeding device WF 1, and the first arc 31 is generated between the base material 2 and the first welding wire 11. The second welding wire 12 is fed by the second wire feeding device WF2 and the second arc 32 is generated between the second wire feeding device WF2 and the base material 2. In the figure, the first arc 31 and the second arc 32 are positioned back and forth in the welding direction, but may be positioned in a direction (lateral direction) orthogonal to the welding direction. The feeding speed of the first welding wire 11 and the feeding speed of the second welding wire 12 are determined by a first feed control signal Fc1 and a second feed control signal Fc2, for example, a feed ratio of 2: 1. Different values are set as follows.

[Prior Art 3]
The invention of Prior Art 3 described in Patent Document 3 is as follows. The wire feeding device for two-electrode arc welding of Prior Art 3 is provided between a wire feeding reel in which two welding wires are wound around one wire reel and two wire cable outlets corresponding to the wire feeding reel. Are provided with a wire separating piece for separating and taking out two welding wires from the reel, and a feeding roll having a number of roll grooves corresponding to the number of welding wires. That is, in FIG. 2 described above, two feeding grooves are formed in the first feeding roll 61 and the first pressure roll 71, and the first welding wire 11 and the second welding wire 12 are divided into two. It is fed by the feeding groove. Therefore, the second feeding motor M2, the second feeding roll 62, and the second pressure roll 72 are not necessary, and only the first wire feeding device WF1 is required. In this case, naturally, the feeding speed of the first welding wire 11 and the feeding speed of the second welding wire 12 are the same value, so the applicable range is limited.

JP 2003-236665 A JP 2001-287031 A JP 10-113771 A JP 2004-167514 A

  As described above, the present invention relates to a wire feeding device and an arc welding method for selecting and performing two-electrode arc welding or single-electrode arc welding according to a welding location. In the prior art 1 described above, the type of the welding wire can be automatically changed in the single electrode arc welding. However, since the change takes time, if it is frequently changed for each welding location, the production efficiency is greatly reduced. Furthermore, in the prior art 1, it is not possible to switch between two-electrode arc welding and single-electrode arc welding.

  In the prior art 2 described above, two-electrode arc welding and single-electrode arc welding can be efficiently selected according to the welding location. This is because in FIG. 2 described above, the first welding wire 11 and / or the second welding wire 12 can be selected and fed by the feeding control signals Fc1 and Fc2. For example, the first welding point performs two-electrode arc welding, the second welding point performs single-electrode arc welding using the first welding wire 11, and the third welding point uses the second welding wire 12. It is possible to efficiently perform the single electrode arc welding used. However, such welding is often performed using a welding robot. For this purpose, it is necessary to mount two wire feeders WF1 and WF2 on the robot arm. As a result, the weight burden and the installation space burden on the robot arm are increased, and a robot larger than the normal one has to be used. As a result, the equipment cost is high.

  In the prior art 3 described above, two-electrode arc welding can be performed with a single wire feeder. However, single electrode arc welding cannot be selected.

  Therefore, in the present invention, in order to solve the above-described problems, a wire feeding device and an arc welding method capable of efficiently selecting two-electrode arc welding or single-electrode arc welding with a single wire feeding device. provide.

In order to solve the above-described problem, the first invention includes one feeding motor,
A first feed roll for feeding the first welding wire and a second feed roll for feeding the second welding wire, which are rotationally driven by the feed motor via the gear unit; ,
First and second pressure rolls arranged opposite to the first and second feeding rolls;
1st and 2nd which are provided in each of the 1st and 2nd pressurization rolls, and can control ON / OFF of press to the feed roll of the pressurization rolls based on the press control signal from the outside. Two pressing mechanisms,
When only the first pressing mechanism is turned on by the pressing control signal, the first pressure roll is pressed by the first feeding roll, and the first welding wire is fed,
When only the second pressing mechanism is turned on by the pressing control signal, the second pressing roll is pressed by the second feeding roll, and the second welding wire is fed,
When the first and second pressing mechanisms are turned on by the pressing control signal, the first pressing roll is pressed by the first feeding roll and the first welding wire is fed. In addition, the wire feeding device is characterized in that the second pressure roll is pressed against the second feeding roll and the second welding wire is fed.

  Further, the second invention uses the wire feeding device according to the first invention and performs welding by selecting the first welding wire and / or the second welding wire by the pressing control signal. This is an arc welding method characterized by the above.

  According to the present invention, the feeding of the first welding wire and / or the second welding wire can be selected by one wire feeding device, and two-electrode arc welding or single-electrode arc welding is used as a welding point. You can use them according to your needs. Furthermore, in the present invention, even when single electrode arc welding is performed, a desired type of welding wire can be selected from the first welding wire or the second welding wire. In the present invention, since there is one wire feeding device, the mounting on the robot arm is the same as a normal wire feeding device. The wire feeding device of the present invention is a space saving because it has a pressing mechanism added to the pressure roll and has a simple structure.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a configuration diagram of a two-electrode / single-electrode arc welding apparatus including a wire feeding device WF according to an embodiment of the present invention. This figure corresponds to FIG. 2 described above, and the same components are denoted by the same reference numerals and description thereof is omitted. The welding apparatus shown in the drawing can efficiently select two-electrode arc welding and single-electrode arc welding by one wire feeder WF. Hereinafter, a description will be given with reference to FIG.

  The first welding power source PS1 supplies power to the first welding wire 11 and outputs a feed control signal Fc for controlling the rotation of the feed motor M, and first and second presses described later. A pressing control signal Pc for controlling the pressing on / off of the mechanisms 81 and 82 is output.

  The rotary shaft of the feed motor M is branched into two rotary shafts a and b by the two-output gear unit 5. The rotation ratio a: b between the two rotation shafts is set to a desired value. For example, 1: 1, 2: 1, 1: 2, etc. The first feeding roll 61 is rotated by the rotating shaft a, and the second feeding roll 62 is rotated by the rotating shaft b. The first pressure roll 71 is disposed opposite to the first feeding roll 61, and is pressed on / off by the first pressing mechanism 81. The second pressure roll 72 is disposed opposite to the second feed roll 62, and is pressed on / off by the second pressing mechanism 82. The first and second pressing mechanisms 81 and 82 are controlled to be turned on / off independently by the above-described pressing control signal Pc. The pressing mechanism itself that is turned on / off by an external signal is publicly known. Technology (for example, see Patent Document 4).

  For example, when the pressure control signal Pc is a 2-bit signal and the value is 0, both the first and second pressing mechanisms 81 and 82 are pressed off, and when the value is 1, the first pressing mechanism 81 is turned off. When the value is 2, only the second pressing mechanism 82 is pressed on, and when the value is 3, both the first and second pressing mechanisms 81 and 82 are pressed on. . When the feeding motor M is rotating, a corresponding welding wire is fed by a pressure roll whose pressing mechanism is pressed on. That is, when the pressure control signal Pc = 1, the first welding wire 11 is fed and single electrode arc welding is performed, and when Pc = 2, the second welding wire 12 is fed and the single welding wire 12 is fed. Electrode arc welding is performed, and when Pc = 3, the first welding wire 11 and the second welding wire 12 are fed to perform two-electrode arc welding. At this time, the feeding speed of the two welding wires becomes a desired value that varies depending on the gear ratio a: b of the two-output gear unit 5 described above.

  In the figure, although two welding wires are fed through one welding torch 4, welding wires may be fed inside each of the two welding torches 4. Further, although the welding wires are insulated from each other in the figure, they may be at the same potential. In this case, only one welding power source may be used.

  According to the above-described embodiment, the feeding of the first welding wire and / or the second welding wire can be selected by one wire feeding device, and two-electrode arc welding or single-electrode arc welding can be performed. It can be used properly according to the welding location. Furthermore, in this embodiment, a desired type of welding wire can be selected from the first welding wire or the second welding wire even when performing single electrode arc welding. In this embodiment, since there is one wire feeding device, the mounting on the robot arm is the same as that of a normal wire feeding device. The wire feeding device according to the present embodiment is obtained by adding a pressing mechanism to the pressure roll, and has a relatively simple structure, thus saving space.

It is a block diagram of the 2 electrode / single electrode arc welding apparatus containing the wire feeder WF which concerns on embodiment of this invention. It is a block diagram of the two-electrode arc welding apparatus in a prior art.

Explanation of symbols

2 Base material 4 Welding torch 5 2 output gear unit 11 1st welding wire 12 2nd welding wire 31 1st arc 32 2nd arc 41 1st feed tip 42 2nd feed tip 51 1st gear Unit 52 Second gear unit 61 First feeding roll 62 Second feeding roll 71 First pressure roll 72 Second pressure roll 81 First pressing mechanism 82 Second pressing mechanism a Rotating shaft b Rotating shaft Fc Feed control signal Fc1 First feed control signal Fc2 Second feed control signal M Feed motor M1 First feed motor M2 Second feed motor Pc Press control signal PS1 First Welding power source PS2 Second welding power source WF Wire feeding device WF1 First wire feeding device WF2 Second wire feeding device

Claims (2)

One feed motor,
A first feeding roll for feeding the first welding wire and a second feeding roll for feeding the second welding wire, which are rotationally driven by the feeding motor via the gear unit; ,
First and second pressure rolls arranged opposite to the first and second feeding rolls;
1st and 2nd which is provided in each of the 1st and 2nd pressurization rolls, and can control ON / OFF of press to the feed roll of the pressurization rolls based on the press control signal from the outside. 2 pressing mechanisms,
When only the first pressing mechanism is turned on by the pressing control signal, the first pressure roll is pressed by the first feeding roll and the first welding wire is fed,
When only the second pressing mechanism is turned on by the pressing control signal, the second pressing roll is pressed by the second feeding roll, and the second welding wire is fed,
When the first and second pressing mechanisms are turned on by the pressing control signal, the first pressure roll is pressed by the first feeding roll and the first welding wire is fed. At the same time, the second pressure roll is pressed against the second feed roll to feed the second welding wire. An arc welding method using the wire feeding device according to claim 1 and performing welding by selecting the first welding wire and / or the second welding wire by the pressing control signal.

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