JPH0347735Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a core wire cutting device for a welding machine.
More specifically, it is suitable for miniaturization that enables the welding core wire that is automatically fed out and used for welding in an automatic arc welding machine to reliably cut without impact when the welding core wire is welded to the bead. This invention relates to a core wire cutting device.

BACKGROUND ART Automatic arc welding machines that automatically perform continuous welding by moving a cart on which a long welding core wire and a welding device are mounted along a welding direction via a rotational drive source have been widely used. The automatic arc welding machine performs welding along a predetermined path by automatically feeding out a welding core wire. However, if the timing at which the welding torch is separated from the workpiece is delayed at the end of one welding pass, the bead and welding core wire may be welded together, resulting in the inconvenience that the welding process cannot proceed to the next step.

Therefore, in the prior art, there is a technical concept disclosed in Japanese Patent Application Laid-open No. 87983/1983 as a device for cutting the weld core wire when the weld core wire is welded to the bead.

That is, this device for cutting the welding core wire welded to the bead includes an actuator supported together with a welding torch on the arm of an automatic arc welding machine, and a core wire cutting tool that is driven toward the welding site by the operation of this actuator. and a detection circuit that electrically detects the welding state between the weld core wire and the bead.

In such a configuration, when welding of the weld core wire is detected by the detection circuit at the end of welding,
When the actuator is actuated, the core wire cutting tool attached to the tip of the actuator moves in a straight line toward the connection area between the welding core wire and the bead, and the cutting tool's cutting tool cuts the weld from the welded part. Cut the core wires and separate them.

However, when the actuator is configured to be supported together with the welding torch on the arm of an automatic arc welding machine as described above, in order to direct the core wire cutting tool to the welded part of the bead and the weld core wire, it is necessary to
An actuator and a core wire cutting device must necessarily be provided between the welding torch and the welding torch that approaches the welding base material. On the other hand, in order to directionally displace the core wire cutting tool to the welded portion between the weld core wire and the bead, the cutting tool must be linearly moved diagonally from the side with respect to the weld core wire. In this case, depending on the state of welding of the weld core wire to the bead, the tip of the core wire cutting tool may slide, making it difficult to reliably cut the weld core wire.

In addition, depending on the shape of the welding base material, the actuator installed between the welding torch and the welding base material may come into contact with the welding base material, which may impede the welding work of the automatic arc welding machine and ensure reliable welding. There are inconveniences such as not being able to perform work.

The present invention has been made in order to overcome the above-mentioned disadvantages, and is provided with a welding torch and a cutting mechanism holding plate in relation to the welding torch in the arm of an automatic arc welding machine, and the cutting mechanism holding plate is provided with a cutting mechanism holding plate at the tip of the cutting mechanism holding plate. A core wire cutting mechanism is attached to the section, and a set of blades constituting the cutting mechanism reliably cuts the welding core wire fed out from the tip of the welding torch from the orthogonal direction, while driving the cutting tool. A driving source for the welding process is attached to the arm part, thereby reducing the size of the surrounding structure of the welding torch that approaches the welding base material, further improving workability, and making continuous work of the automatic arc welding machine easier. The purpose of the present invention is to provide a core wire cutting device that enables the following.

In order to achieve the above object, the present invention provides a core wire cutting device attached to a welding machine for cutting the tip of the welded core wire when the weld core wire is welded to the bead, comprising: The core wire cutting device is mounted on a welding torch of a welding machine, and is equipped with a set of arm members that face the welding core wire feeding portion of the welding torch and are rotated by a link mechanism, and are equipped with a set of arm members that rotate by a link mechanism. It is characterized by having a set of curved blade parts.

Next, preferred embodiments of the core wire cutting device for a welding machine according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 indicates a main body of an automatic arc welding machine according to the present invention, and this main body 1
0 basically consists of a welding torch holder 12 and a core wire cutting mechanism 14 that cuts the weld core wire 22. The welding torch holder 12 is composed of a first arm 16 , a second arm 18 pivoted to the tip of the first arm 16 , and a welding torch 20 supported by the second arm 18 . A welding core conduit 23 for flexiblely guiding the welding core 22 is interposed between the second arm 18 and the welding torch 20, and a welding core 23 is inserted from the tip of the welding torch 20. 22 stands out. On the other hand, a first cutting mechanism holding plate 24 is attached to the second arm 18 along the welding core wire conduit 23, and the tip of the first cutting mechanism holding plate 24 is bent to hold the welding torch. A second cutting mechanism retaining plate 26 pointing towards 20 is connected. A cutting mechanism 28 is attached to the tip of the second cutting mechanism holding plate.

Note that the first arm 16 is provided with the cutting mechanism 2.
A drive source 30 consisting of a cylinder, for example, that drives the drive source 8 is supported by a drive source mounting plate 32 and a drive source mounting angle member 34 . The drive source 30 is positioned substantially parallel to the first arm 16 . A piston (not shown) is slidably disposed inside the drive source 30, and as the piston moves, the tip of the piston rod 36 protrudes. The tip of the piston rod 36 is connected via a connecting member 38 to one end of a wire 40 for driving the cutting mechanism 28. That is, the other end of the wire 40 passes through a hole that extends toward the drive source 30 through a first guide member 42 that stands upright from the drive source mounting plate 32, and passes through a hole that extends toward the drive source 30. The cutting mechanism 28 is connected to the cutting mechanism 28 by passing through a hole formed therein.
It can be easily understood from the figure that the second guide member 44 is disposed at a substantially curved connection portion between the first cutting mechanism holding plate 24 and the second cutting mechanism holding plate 26.

Next, the cutting mechanism 28 will be explained in more detail with reference to FIGS. 2 and 3.

As shown in FIGS. 2 and 3, the second cutting mechanism holding plate 26 has support portions 26a and 26b extending outward parallel to each other at its distal end. Holes 45a and 45b are bored so as to correspond to each other. By inserting one pin 49 into these holes 45a, 45b, the core wire cutting arms 46, 48 are rotatably supported. In fact, as can be understood from FIG. 2, the core wire cutting arm 46 is constituted by an arm member having a plurality of stepped portions that approach the welding core wire 22 as it approaches the tip. . Note that a blade portion 46a is formed at one end of this arm member so as to be perpendicular to the welding core wire 22 drawn out from the welding torch 20, and a recess 4 for receiving a link 50, which will be described later, is formed at the other end.
6b is defined, and a bulge 46c is further formed on the way. As shown in the figure, the bulging portion 46c is provided with a hole into which a pin 49 is inserted.

The core wire cutting arm 48 is similar to the cutting arm 46.
The bulge portion 48c and the blade portion 48 corresponding to the bulge portion 46c are formed substantially the same as the bulge portion 46c.
The shape of a is different. That is, the blade part 46a has an acute-angled protrusion 46d in part;
8a has a rather flat receiving surface 48d. Therefore, if the weld core wire 22 is sandwiched between the acute-angled protrusion 46d and the receiving surface 48d and one of them is pressed against the other, the weld core wire 22 will not be cut. Of course.

Therefore, as mentioned above, the cutting arms 46, 4
Recesses 46b and 48b for receiving links 50 and 54 are defined at the other end of each of the links 8. In fact, one end of the links 50, 54 has a hole 50
A, 54a and the cutting arms 46, 48 are rotatably engaged with each other by inserting pins 52, 56 into holes formed at the other end thereof. The other ends of the links 50, 54 are the cutting arms 46, 4.
The hole portions 50b, 5
By inserting the pin 60 through 4b, they are mutually engaged. In this case, a U-shaped connecting member 58 is attached to the other end of the links 50 and 54 superimposed as described above.
By straddling the connecting member 58 and the links 50, 54, the pin 60 integrally supports the connecting member 58 and the links 50, 54 so as to be rotatable, and the connecting member 58 is connected to the tip of the wire 40.

The core wire cutting device according to the present invention is basically constructed as described above, and its operation and effects will be explained next.

First, as shown in FIG.
6 and the second arm 18, the welding torch 20 is directionally displaced to a position where welding work is started, and then the welding core wire 22 is let out from the welding torch 20 to start welding. As a result, a bead 74 is formed between the welding base materials 70 and 72, and the two base materials are integrated.

By the way, as mentioned above, when attempting to perform automatic arc welding, if the bead 74 is in a molten state, it is possible to easily separate the welding torch 20 from the welding area and use it for the next welding process etc. However, if the bead 74 and the welding core wire 22 are cooled and solidified in a joined state, it becomes difficult to separate the welding torch 20 from each other. In such a case, the device of the present invention will be energized.

That is, in a normal state, a piston (not shown) in the drive source 30 is at the A position side. In this state, the wire 40, as shown in FIG.
The links 50 and 54 are connected to the bead 7 via the connecting member 58.
It has reached the point where it is being pushed towards the 4th side. Therefore, as is clear from FIG. 4, the other ends of the cutting arms 46 and 48 approach each other with the pin 49 as a fulcrum, and as a result, the blades 46a and 48a are spaced apart from each other. be.

Therefore, as described above, when the weld core wire 22 and the bead 74 are cooled and solidified and become connected, the piston (not shown) in the drive source 30 is driven and displaced to move in the direction of the arrow. As a result, the piston rod 36 connected to the piston
are the connection member 38, the first guide member 42 and the second
The wire 40 is pulled through the guide member 44.
As shown in FIG. 5, the pulling action of the wire 40 causes the links 50 and 54 to rotate in the direction of the arrow via the connecting member 58, thereby causing the core wire cutting arms 46 and 48 to rotate the pin 49. It rotates around the center and acts to bring the blade parts 46a, 48a closer to each other. As a result, the protrusion 46d and the receiving surface 48d come closer to each other with the welding core wire 22 in between, and are finally joined to each other. As a result, the welding core wire 22 is cut and the welding torch 20 can be separated from the bead 74. In this case, since the cutting operation is performed while the blade portion is in contact with the weld core wire 22 at right angles, reliable cutting is possible.

Then, the blade parts 46a and 46b are separated from each other,
A new welding core wire is supplied and the next stage of welding work is performed.

As described above, according to the present invention, when the weld core wire is welded to the bead at the end of the welding work, the cutting mechanism is configured to face the weld core wire from a direction perpendicular to the weld core wire and cut the welded weld core wire. There is.
Therefore, it is possible to provide a compact and highly workable core wire cutting device that is used around the welding torch that approaches the welding base metal, and the weld core wire is welded to the bead by a cutting mechanism that operates perpendicularly to the weld core wire. The advantage is that the cutting is more reliable, and as a result continuous operation of the automatic arc welding machine is possible.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments, and various improvements and changes in design are possible without departing from the gist of the present invention. Of course.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the core wire cutting device according to the present invention, FIG. 2 is a perspective view showing the cutting mechanism in the core wire cutting device according to the present invention, and FIG. 3 is a side view showing the cutting mechanism in the core wire cutting device according to the present invention. Exploded perspective view, 4th
The figure is a partially omitted plan view showing the state in which the blade of the cutting mechanism in the core wire cutting device according to the present invention is open, and FIG. 5 shows the state in which the blade of the cutting mechanism in the core wire cutting device according to the present invention is closed. It is a partially omitted plan view. 10... Main body part, 12... Welding torch holding part,
14... Core wire cutting mechanism, 16... Arm, 20...
... Welding torch, 22 ... Welding core wire, 28 ... Cutting mechanism, 30 ... Drive source, 40 ... Wire, 46,
48...Arm for cutting core wire.

Claims (1)

[Scope of Claim for Utility Model Registration] A core wire cutting device attached to a welding machine for cutting the tip of the welded core wire when the weld core wire is welded to a bead, the core wire cutting device comprising: A set of arm members is mounted on the welding torch of the machine, facing the welding core wire feeding part of the welding torch, and rotates by a link mechanism, and the tips of the arm members are bent to form a set of arm members. A core wire cutting device characterized by having a blade section.