JP7454432B2 - Spatter removal equipment for welded steel pipes - Google Patents

Description

The present invention relates to a spatter removal device for removing spatter generated during welding in a welded steel pipe manufacturing apparatus.

Conventionally, as a manufacturing device for welded steel pipes, both ends of a continuously supplied steel strip are rolled into a tubular shape to form an open pipe, and the V-shaped groove of the open pipe is heated by a work coil. 2. Description of the Related Art A welded steel pipe manufacturing apparatus is known that has a squeeze roll that presses and welds a V-shaped groove.

The work coil uses a high-frequency induction heating coil, and the V-shaped groove heated by the work coil is welded by pressing both ends of the groove against each other with a pair of squeeze rolls. It is known that spatter is generated during welding with this squeeze roll. If this spatter solidifies while adhering to the squeeze roll or welded steel pipe and is formed using a forming roll, the solidified spatter may cause indentation scratches on the surface of the welded steel pipe, resulting in poor appearance.

Various methods are known to prevent appearance defects caused by such spatter. For example, as described in Patent Document 1, oxidizing gas is injected toward spatter emitted and scattered during welding. , a method of burning or melting spatter by oxidation, and a method of separating and collecting spatter using a cyclone dust collector through a duct as described in Patent Document 2 are known.

Japanese Patent Application Publication No. 7-80661 Japanese Patent Application Publication No. 2002-321070

However, with conventional spatter removal methods, it is difficult to burn, melt, and recover all the spatter, and it is difficult to reliably prevent spatter from adhering to the squeeze roll with any of these methods, and it is still difficult to prevent spatter from adhering to the squeeze roll. There was a problem that an outbreak occurred. Furthermore, it is necessary to install large equipment such as a gas injection device and a cyclone dust collector around the welded steel pipe manufacturing equipment, which poses a problem in that it is difficult to save space and reduce installation costs.

Therefore, the present invention was made in view of the above problems, and can more reliably remove spatter and reduce appearance defects of welded steel pipes, and can be easily installed in welded steel pipe manufacturing equipment. An object of the present invention is to provide a spatter removal device that can save space.

The welded steel pipe spatter removal apparatus according to the present invention forms a steel strip continuously supplied from the upstream side into an open pipe, and includes a work coil that heats a V-shaped groove of the open pipe, and a work coil that heats the V-shaped groove of the open pipe, and a work coil that heats the V-shaped groove of the open pipe. A welded steel pipe spatter removal apparatus for removing spatter generated during welding in a welded steel pipe manufacturing apparatus, comprising: a squeeze roll for crimping and welding a V-shaped groove; It includes a cover member disposed to cover the upper side and a scraper in contact with the outer periphery of the squeeze roll , and the scraper includes an upstream scraper and a downstream scraper disposed on the upstream side and downstream side of the squeeze roll, respectively. the scraper on the downstream side includes a second scraper in contact with the groove of the squeeze roll; the upstream scraper includes a third scraper in contact with the groove in the squeeze roll; At least one of the second scraper and the third scraper is characterized in that it has a nonwoven fabric in contact with the groove .

Moreover, in the spatter removal apparatus for a welded steel pipe according to the present invention, it is preferable that the scraper on the downstream side includes a first scraper in contact with the upper edge of the squeeze roll.

Further, in the spatter removal device for a welded steel pipe according to the present invention, it is preferable that a wiping means that contacts the outer periphery of the welded steel pipe is provided between the squeeze roll and a forming roll arranged downstream of the squeeze roll. .

The above summary of the invention does not list all the necessary features of the invention, and subcombinations of these features may also constitute the invention.

According to the spatter removal device for welded steel pipes according to the present invention, since the cover member is arranged to cover at least the upper part of the upstream side of the squeeze roll and the scraper is in contact with the outer periphery of the squeeze roll, spatter generated during welding can be removed. This prevents spatter from adhering to the squeeze roll, and even if spatter adheres to the squeeze roll, the spatter can be removed with a scraper, making it possible to easily and inexpensively install a spatter removal device, and to prevent welding. By preventing spatter from adhering to the steel pipe, poor appearance of the welded steel pipe can be reduced.

1 is a conceptual diagram showing a welded steel pipe manufacturing apparatus according to an embodiment of the present invention. FIG. 1 is a plan view for explaining the outline of a sputter removal apparatus according to an embodiment of the present invention. FIG. 3 is a diagram for explaining the configuration of a first scraper. FIG. 6 is a diagram for explaining the configuration of second and third scrapers.

Hereinafter, preferred embodiments for carrying out the present invention will be described using the drawings. Note that the following embodiments do not limit the inventions claimed in each claim, and not all combinations of features described in the embodiments are essential to the solution of the invention. .

FIG. 1 is a conceptual diagram showing a welded steel pipe manufacturing apparatus according to an embodiment of the present invention, and FIG. 3 is a diagram for explaining the configuration of the first scraper, and FIG. 4 is a diagram for explaining the configurations of the second and third scrapers.

As shown in FIG. 1, the welded steel pipe manufacturing apparatus 1 according to the present embodiment forms an open pipe 2 by rounding both ends of a steel strip that is continuously supplied from the upstream side, and forms a V-shape of the open pipe 2. A work coil 3 that heats the V-shaped groove, a squeeze roll 10 that presses and welds the heated V-shaped groove, and weld burrs on the outer and inner peripheries of the welded steel pipe 7 that is welded into a tubular shape by the squeeze roll 10. It has a deburring device 6 for removing burrs, forming rolls 8 for forming the welded steel pipe 7, and a cutting device (not shown) for cutting the welded steel pipe 7 into a predetermined length.

The work coil 3 includes an impeder that concentrates a high-frequency induced current on the V-shaped groove of the open tube 2, and a nozzle for cooling the impeder. As shown in FIGS. 3 and 4, the squeeze roll 10 is a generally drum-shaped member having an upper edge 11 and a groove 12 extending in the circumferential direction. The V-shaped grooves heated by the coil 3 are pressed together and welded.

At this time, as shown in FIG. 1, spatter 5 is scattered on the downstream side of the squeeze roll 10. This spatter 5 is prevented from adhering to the welded steel pipe 7 by providing a shielding plate 4 between the forming roll 8 and the squeeze roll 10.

Next, a spatter removal device for welded steel pipes according to the present embodiment will be explained. The spatter 5 scattered during welding is also scattered to the upstream side due to the rotational force of the squeeze roll 10. In order to prevent the spatter 5 scattered on the upstream side from adhering to the open tube 2, a cover member 20 is provided to cover at least the upper part of the upstream side of the squeeze roll 10.

Furthermore, in order to prevent the spatter 5 from getting caught between the squeeze roll 10 and the open tube 2 and creating an indentation when spatter 5 adheres to the squeeze roll 10, a scraper 21 is provided which is in contact with the outer periphery of the squeeze roll 10. , 22, 23.

As shown in FIG. 2, a plurality of scrapers are formed so as to be in contact with the outer peripheral surface of the squeeze roll 10, and a first scraper 21 and a second scraper 22 are attached to the downstream side of the squeeze roll 10. A third scraper 23 is attached to the upstream side. For the purpose of explanation, FIG. 2 shows a case where the scrapers 21, 22, and 23 are installed in contact with only one squeeze roll 10, and the scraper in contact with the other squeeze roll 10 is omitted from the illustration. There is.

The first scraper 21 is installed downstream of the closest portion of the pair of squeeze rolls 10, and is in contact with the upper edge 11 of the squeeze rolls 10, as shown in FIG. For the first scraper 21, a flat plate made of stainless steel, for example, is preferably used.

As shown in FIG. 2, the second scraper 22 and the third scraper 23 are respectively disposed upstream and downstream of the squeeze roll 10, and the first scraper 21, the second scraper 22, and the third scraper The three scrapers 23 are arranged in the order of the first scraper 21 , the second scraper 22 , and the third scraper 23 along the rotational direction of the squeeze roll 10 .

As shown in FIG. 4, the second scraper 22 and the third scraper 23 have similar shapes, and their tips correspond to the shape of the grooves 12 so as to be in contact with the grooves 12 of the squeeze roll 10. The scraper body 24 has an arc-shaped scraper body 24, and an upper piece portion 25 extending along the upper edge of the scraper body 24.

Further, a nonwoven fabric 26 is attached to the tips of the second scraper 22 and the third scraper 23. When a gap is generated between the groove 12 of the squeeze roll 10 and the tips of the second scraper 22 and the third scraper 23 due to wear or the like, the nonwoven fabric 26 fills this gap to ensure that the squeeze roll 10 The groove 12 is provided to remove spatter 5 attached to the groove 12, and preferably contains an abrasive or the like. Note that, like the first scraper 21, it is preferable that the second scraper 22 and the third scraper 23 are also made of stainless steel.

Note that the first scraper 21, the second scraper 22, and the third scraper 23 are attached movably along the radial direction of the squeeze roll 10, and the degree of contact with the squeeze roll 10 can be adjusted. ing.

Further, as shown in FIG. 1, the spatter removal device for welded steel pipes according to the present embodiment directly contacts the outer peripheral surface of the welded steel pipe 7 immediately before the forming roll 8 after welding with the squeeze roll 10 to remove the outer surface. A wiping means 30 for wiping is attached. A cloth member such as cloth is preferably used as the wiping means 30 to remove spatter 5 that could not be removed by the scrapers 21, 22, and 23.

According to the welded steel pipe spatter removal apparatus according to the present embodiment configured as described above, the cover member 20 that covers the upper upstream side of the squeeze roll 10 prevents the scattered spatter 5 from adhering to the open pipe 2. At the same time, since scrapers 21, 22, and 23 that are in contact with the upper edge 11 and the inside of the groove 12 of the squeeze roll 10 are provided on the upstream and downstream sides, the spatter 5 adhering to the squeeze roll 10 can be removed and the squeeze roll 10 It is possible to suppress the occurrence of impressions caused by the sputter 5 attached to the surface. Furthermore, since the wiping means 30 is provided just before the forming roll 8, it is possible to remove the spatter 5 adhering to the outer periphery of the welded steel pipe 7 and prevent the formation of impressions by the forming roll 8. It is possible to reduce appearance defects.

Furthermore, the spatter removal device for welded steel pipes according to the present embodiment can be installed easily and inexpensively without adding large-scale equipment, unlike conventional spatter removal methods.

In the above embodiment, the case where three scrapers 21, 22, and 23 are provided on the outer periphery of the squeeze roll 10 has been described, but the number can be changed as necessary. Moreover, although the case where the cover member 20 covers the upper part of the upstream side of the squeeze roll 10 has been described, it is also possible to extend the cover member 20 to the downstream side of the squeeze roll 10 or to cover the entire squeeze roll 10. I don't mind. It is clear from the claims that such modifications or improvements can be included within the technical scope of the present invention.

1 Welded steel pipe manufacturing device, 2 Open pipe, 3 Work coil, 4 Shielding plate, 5 Spatter, 6 Deburring device, 7 Welded steel pipe, 8 Forming roll, 10 Squeeze roll, 11 Upper edge, 12 Groove, 20 Cover member , 21 first scraper, 22 second scraper, 23 third scraper, 24 scraper body, 25 upper piece, 26 nonwoven fabric, 30 wiping means.

Claims (3)

A work coil that forms the steel strip continuously supplied from the upstream side into an open tube and heats the V-shaped groove of the open tube, and a squeeze that presses and welds the heated V-shaped groove. A welded steel pipe spatter removal device for removing spatter generated during welding in a welded steel pipe manufacturing device having a roll,
comprising a cover member disposed to cover at least an upper part of the upstream side of the squeeze roll, and a scraper in contact with an outer periphery of the squeeze roll ,
The scraper includes an upstream scraper and a downstream scraper that are respectively arranged on the upstream and downstream sides of the squeeze roll,
The downstream scraper includes a second scraper in contact with the groove of the squeeze roll,
The upstream scraper includes a third scraper in contact with the groove of the squeeze roll,
A spatter removal device for a welded steel pipe , wherein at least one of the second scraper and the third scraper has a nonwoven fabric in contact with the groove . The spatter removal device for welded steel pipes according to claim 1 ,
The apparatus for removing spatter from a welded steel pipe, wherein the downstream scraper includes a first scraper that contacts the upper edge of the squeeze roll. The spatter removal device for welded steel pipes according to claim 1 or 2 ,
A spatter removal device for a welded steel pipe, comprising a wiping means in contact with the outer periphery of the welded steel pipe between the squeeze roll and a forming roll disposed downstream of the squeeze roll.

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