JPH06106385A - Apparatus for production of flux cored welding wire - Google Patents

Abstract

PURPOSE:To uniformly fill a flux into a metallic tubular body by pending the tubular body downward and applying vibrations thereto in a stage for production of the tubular body after filling a flux therein. CONSTITUTION:A metallic band body 12 is formed to a trough shape in sectional shape by plural rolling rolls 14 and the flux 16 consisting of metallic powder and deoxidizing agent is filled therein by a flux filling device 15. The metallic band body 12 having the trough-shaped section is thereafter so formed that both edges in a longitudinal direction face each other and the joint thereof is welded to the tubular body 12a. The tubular body 12a is held pendent by guide rollers of a descending means 17 at this time. Further, a vibration applying means 18 drives an annular body 18b back and forth to vibrate the pendent part of the tubular body 12a. The gap parts of the flux in the tubular body 12a are thereby decreased and the generation of blowholes at the time of welding is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing a flux-cored welding wire, and more particularly to an apparatus for producing a flux-cored welding wire in which the filling property of the flux into the metal tubular body is improved.

[0002]

2. Description of the Related Art In general, a flux-cored welding wire in which a desired flux is contained in a metal tubular body is known, and is manufactured as follows. That is, first, the rolled metal strip is unrolled and conveyed in its longitudinal direction, and is sequentially processed into a gutter shape from its conveying end portion by using a rolling roller. Next, a desired flux composed of metal powder, a deoxidizing agent and the like is filled on the trough-shaped metal strip. Then, using a rolling roller, further processing is performed so that both longitudinal edges of the gutter-shaped metal strip face each other,
The transfer end is formed into a tubular body in order. After that, the both edges in the longitudinal direction in the open seam state are sequentially seam welded. After this welding, rolling is sequentially performed to reduce the tube diameter of the tubular body. Finally, the flux-cored welding wire manufactured in this way is wound in a coil shape from the transport end. In the above-described manufacturing process, the metal strip is conveyed in a substantially horizontal direction until it becomes a flux-cored welding wire, and each process is continuously performed.

[0003]

By the way, in the prior art, as shown in FIG. 3, there is a problem that the flux 2 is not uniformly filled in the metal tubular body 1.

In particular, since the seam portion 1a of the tubular body 1 processed so that both longitudinal edges of the metal strip face each other is located at the upper part in the manufacturing process, the void portion 3 is formed in the vicinity thereof. However, there is a problem that the weldability of the flux-cored welding wire 4 is deteriorated by the air remaining in the void 3.

In view of the above problems, it is an object of the present invention to manufacture a flux-cored welding wire capable of uniformly filling the metal tubular body with flux and improving the weldability of the flux-cored welding wire. To provide.

[0006]

[Means for Solving the Problems] In order to achieve the above object,
The manufacturing apparatus for the flux-cored welding wire according to the present invention,
The metal strip is formed by closing the tubular body so that both edges in the longitudinal direction face each other, and is filled with flux in the forming process, and then the tubular body filled with the flux is introduced downward. It is equipped with means.

Further, in the above construction, preferably, a vibration adding means for vibrating the tubular body filled with the flux is provided below the tubular body.

[0008]

According to the above-mentioned structure, the metal strip is formed by closing the tubular body so that both longitudinal edges thereof face each other.
During the molding process, the tubular body is filled with flux. Since the seam portion of the tubular body is located at the upper portion in this molding / filling process, a void portion is likely to be formed in the vicinity thereof. However, the tubular body filled with the flux is introduced downward by the descending means provided in the manufacturing apparatus of the present invention after the molding / filling step. When the flux-filled tubular body is introduced downward, the tubular body is inclined downward or hung down. Therefore, the flux spreads over the voids remaining in the tubular body, and the flux is uniformly filled.

Further, when the manufacturing apparatus of the present invention is provided with the vibration adding means, the vibration adding means applies vibration to the portion introduced below the tubular body in which the flux filling is completed. When the tubular body, which has been flux-filled in this way, is vibrated in a downwardly inclined state or in a suspended state, the homogenization of flux-filling is further promoted.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of a flux-cored welding wire manufacturing apparatus according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows a first embodiment of an apparatus for manufacturing a flux-cored welding wire according to the present invention. As shown in the figure, a metal strip 12 wound in a roll shape is located on one side of the flux-cored welding wire manufacturing apparatus 11 of the present embodiment. The roll-shaped metal strip 12 is conveyed in the longitudinal direction Y while being unwound by a guide roller 13 or the like.

A plurality of rolling rolls 14 are provided on the transport side. The metal strip 12 is processed into a gutter shape by gradually passing through the plurality of rolling rolls 14 from the conveying end portion thereof and gradually changing its cross-sectional shape.

Further, a flux filling device 15 is provided in the middle of the plurality of rolling rolls 14.
By the flux filling device 15, a desired flux 16 made of metal powder, a deoxidizing agent or the like is filled on the metal strip 12 formed in the gutter shape.

Then, the gutter-shaped metal strip 12 filled with the flux 16 further passes through the rolling rolls 14 and processed so that both longitudinal edges of the gutter-shaped metal strip 12 face each other. From the transport end, the tubular body 12a is sequentially closed and molded.

On the conveying side of the plurality of rolling rolls 14 is provided a descending means 17 for introducing the tubular body 12a, which has been flux-filled, downward. In this embodiment, the descending means 17 is formed by a guide roller,
By devising the arrangement of the guide roller, it functions as a means for introducing the tubular body 12a downward. Therefore, the tubular body 12a, which has been conveyed in the forming / filling process in a substantially horizontal direction, is introduced downward by the descending means 17. In the present embodiment, the tubular body 12a for which the flux filling has been completed is hung by the descending means 17, but it may be inclined downward.

Further, the hanging portion of the tubular body 12a, which has been filled with the flux, is provided with a vibration adding means 18 for giving a vibration to the hanging portion. In this embodiment, the vibration adding means 18 is composed of a ring body 18b having a reciprocating drive means 18a.
Therefore, the vibration adding means 18 vibrates the suspended portion of the tubular body 12a when the ring body 18b reciprocates in the radial direction by the driving means 18b.

A guide roller 19 for re-introducing the tubular body 12a in the horizontal direction is provided on the conveying side of the vibration adding means 18. Further, the welding device 20 and the rolling device 2 are appropriately provided on the conveying side of the guide roller 19.
1 is provided. Therefore, the tubular body 12a introduced in the substantially horizontal direction by the guide roller 19 is sequentially seam-welded by the welding device 20 at the longitudinal edges in the open seam state. After further welding,
The tubular body 12a is sequentially rolled by the rolling device 21 to reduce the tube diameter.

The flux-cored welding wire 22 manufactured as described above is sequentially wound into a coil shape from its transport end.

Next, the operation of the first embodiment will be described.

As described above, the metal strip 12 passes through the plurality of rolling rolls 14 in sequence from its conveying end portion, so that the cross-sectional shape is gradually changed and processed into a gutter shape.
Then, after the desired flux 16 is filled on the gutter-shaped metal strip 12 by the flux filling device 15, the flux 16 further passes through the rolling rolls 14 and both longitudinal edges of the gutter-shaped metal strip 12 are passed. The parts are processed so that they face each other, and the tubular body 12a is sequentially closed from the conveying end part to be molded. In this forming / filling step, the tubular body 12a is conveyed in a substantially horizontal direction, and the seam portion of the tubular body 12a is located at the upper portion, so that a void portion is likely to be formed in the vicinity thereof.

However, in the present embodiment, the tubular body 12a for which the flux filling has been completed is suspended by the descending means 17 after the forming / filling step. The flux 16 filled in the tubular body 12a has fluidity, and by hanging the tubular body 12a,
The action of gravity causes the fluid to flow into the voids remaining in the tubular body 12a. Therefore, the flux 16 can be uniformly filled in the tubular body 12a.

Further, in the present embodiment, the ring body 18b constituting the vibration applying means 18 is reciprocally moved in the radial direction by the driving means 18b provided therein, whereby the tubular body 12a is moved. It is designed to vibrate the hanging part. Therefore, if the tubular body 12a for which the flux filling has been completed is vibrated in such a suspended state, the homogenization of the flux filling can be further promoted.

As described above, since it is possible to prevent air from remaining in the tubular body 12a due to the formation of voids, it is possible to prevent the formation of blowholes during welding and to dramatically improve weldability. be able to. Since such an extremely excellent effect can be achieved by a slight modification of the existing device, the manufacturing cost can be reduced and the versatility is high.

FIG. 2 shows the essential parts of a second embodiment of the flux-cored welding wire manufacturing apparatus according to the present invention. In the second embodiment, the vibration applying means is constituted by a non-circular rolling roll 28. Therefore,
Due to the different diameter of the rolling roll 28, the suspended portion of the tubular body 12a is vibrated.

The second embodiment has the same effects as the first embodiment.

As a prior art example of the present invention, as disclosed in Japanese Patent Laid-Open No. 61-42500, there is a technique in which a tubular body is inclined downward and flux is filled in the inclined portion. In this prior example, when the slanted portion of the tubular body is in the middle of forming and after flux filling, both longitudinal edges of the tubular body are closed by seam welding, and both longitudinal edges of the tubular body are seam welded at the slanted portion. After that, a hollow needle-shaped funnel may be inserted into the tubular body to fill the flux.

In the former case, when seam welding is performed immediately after the flux is filled, there is a problem that the flux is affected by the heat of the seam welding and deteriorates, slags, or adheres to the tubular body, which impedes the flow of the flux. is there. Further, since the longitudinal portions of the tubular body in the longitudinal direction are closed after the filling of the flux with the inclined portion, there is a problem that the filling flux having a collapse angle or more falls off.

To solve these problems, it is effective to insert a hollow needle-shaped funnel into the tubular body seam-welded at the inclined portion and fill the flux with the latter.
The latter case also has the following problems.

That is, in the latter case, since the hollow needle-shaped funnel is inserted into the tubular body to fill the flux, it is necessary to set the funnel diameter large in order to reliably fill the flux. Therefore, along with this, the diameter of the tubular body must be increased, and many drawing steps are required to commercialize the welding wire after molding and filling. Furthermore, in order to pass such many drawing steps, it is necessary to secure sufficient strength of the initial metal strip. Therefore, it is difficult to use a material such as aluminum or copper having a low degree of freedom in the amount of flux filling and a low strength as a hoop material.

On the other hand, according to the present invention, after the forming / filling process of the tubular body 12a in the substantially horizontal state is completed, the tubular body 12a having the flux filled therein is hung down or inclined downward by the descending means 17. Further, in the state where the tubular body 12a for which the flux filling has been completed is hung down or inclined downward, vibration is applied to the tubular body 12a by the vibration applying means 18, 28.

Therefore, the present invention does not have the disadvantages of the above-mentioned prior art, and the initial diameter of the tubular body can be made small. It can be used as a hoop material. Therefore, it is possible to reduce or eliminate the drawing process,
The manufacturing cost can be greatly reduced, and the degree of freedom of the flux filling amount can be improved.

[0032]

As described above, according to the apparatus for manufacturing a flux-cored welding wire according to the present invention, it is possible to uniformly fill the metal tubular body with the flux. As a result,
The excellent effect that the weldability of the flux-cored welding wire can be improved is exhibited.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a first embodiment of an apparatus for manufacturing a flux-cored welding wire according to the present invention.

FIG. 2 is a schematic view of a main part showing a second embodiment of a flux-cored welding wire manufacturing apparatus according to the present invention.

FIG. 3 is a cross-sectional view showing a flux-cored welding wire manufactured by a conventional technique.

[Explanation of symbols]

 11 Flux-cored welding wire manufacturing apparatus 12 Metal strip 12a Tubular body 16 Flux 17 Lowering means 18 Vibration adding means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hideo Ishiyama, Inoue Central Research Institute, Fujisawa City, Kanagawa Prefecture, Isuzu Central Research Institute (72) Inventor, Budoo, Insuichuo, Fujisawa City, Kanagawa Prefecture, Isuzu Chuo Inside the laboratory (72) Inventor Yuji Matsunami 8 Tsutana, Fujisawa City, Kanagawa Prefecture Isuzu Central Research Institute (72) Inventor Harue Sugisaki 8th in Tsunatan, Fujisawa City, Kanagawa Prefecture Isuzu Central Laboratory (72) Invention Akira Tsujimura 8 Tsutana, Fujisawa City, Kanagawa Prefecture, Isuzu Central Research Institute

Claims (2)

[Claims] 1. A metal strip is formed by closing a tubular body so that its two edges in the longitudinal direction face each other, and is filled with flux in the forming process, and then the tubular body filled with the flux is formed. An apparatus for manufacturing a flux-cored welding wire, comprising a descending means for introducing the flux downward. 2. The apparatus for producing a flux-cored welding wire according to claim 1, wherein a vibration adding means for vibrating the tubular body filled with the flux is provided below the tubular body.