JPH03216278A - Manufacture of long size square pipe - Google Patents

Abstract

PURPOSE:To manufacture the long size square pipe with a high accuracy by taking up two couples of long size shape steels having U-shaped cross sections round temporarily winding drums, then, rewinding the above-mentioned long size shape steels at the same speed at the same time, making openings coincident with each other correctly and welding the mating part continuously. CONSTITUTION:The long size shape steels 22 having U-shaped cross sections are taken up round the take-up drums 21. In order to prevent the shape steels from rubbing with each other and being damaged, cushioning materials 24 are rolled up between turns. A motor 25 with a torque limiter for taking up is rotated so that the peripheral speed of the take-up drums 21 is made faster than the delivery speed of the shape steels 22. In addition, the torque limiter is provided on the motor 25 so that unnecessary excessive tension is not given on the shape steels 22. The long size shape steels 22 rewound from the take-up drums 21 mounted on pedestals 29 are abutted on each other in a specified shape and the abutting surfaces are welded and integrated by welding torches 9 and 10. The upper and lower parts and sides are pressed by upper and lower, and side restricted rollers 27 and 28 and the abutting surfaces are welded with pressure.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a method for manufacturing a long rectangular pipe, in particular, a method for manufacturing a long rectangular pipe, in particular, a method in which a rectangular pipe is welded in the longitudinal direction, and a rectangular pipe is continuously formed without longitudinal welding. The present invention relates to a method for manufacturing a long square pipe.

[Prior Art] FIG. 4 shows an example of a conventional method for manufacturing a long rectangular pipe.

In the figure, code (1) indicates the manufactured long square pipe, (
2) is a roll for roll forming to form a long rectangular pipe (1) from a flat plate (4); (3) is a welding torch for welding the butt portions of the formed flat plate (4);
) is a flat plate of the above-mentioned material.

However, according to this method, molding may be difficult, so a method as shown in FIG. 5 is sometimes used. That is, in the figure, symbols (5) to (8) are section steel sections having a U-shaped cross section, and (9) to (11) are the section steel sections (5) to (11).
8) This is a welding torch for welding the butt part. Next, the operation of the above-mentioned conventional device will be explained.

In the method shown in FIG. 4, after bending the flat plate (4) and welding its butt part (4a) with a welding torch (3),
Roll it into a square shape (2).

However, according to this method, roll farming and welding must be performed simultaneously, the degree of processing is large, and the aspect ratio is limited, so the method shown in FIG. 5 is currently often used.

In the method shown in Fig. 5, the previously formed steel sections (5) and (6) are butted together, and the abutted portion (12) is welded with welding torches (9) and (10). and weld together to form a short square pipe (13).

Subsequently, a large number of short rectangular pipes (14
) is formed by, for example, butting shapes m (7) and (8) together and welding them by welding h-chies (9) and (10).

Next, the short square pipes (13) and (14) are welded with a welding torch (11) by accurately butting their respective end faces, and the above is repeated to form the long square pipe (1).
to carry out.

In addition, the above shows the short square pipe (13) first. (14) was constructed, but first multiple sections (6), (8), and (5) were constructed.
There is also a method of butt welding and (7) to form a long section steel into an oval shape, and then butting the long section steels together and welding the butt portion (12).

[Problem to be solved by the invention] The conventional long pipe manufacturing method is as described above, and now that the aspect ratio has been increased, the method shown in Figure 5 has been adopted. However, according to this,
Manual welding is required, which takes time, and the welding direction is three directions, making the equipment complex.Also, since welding is done in three directions, it is difficult to guarantee the quality of this welded part. There were some problems, and we wanted to solve these problems. This invention was made in order to solve the above-mentioned problems, and it is possible to manufacture a long rectangular vibrator by using a simple device, without longitudinal joint welding, and by which a long rectangular vibrator can be manufactured continuously. The purpose is to obtain a method.

[Means for Solving the Problems] The method for manufacturing a long square pipe according to the present invention includes winding a long section steel having a U-shaped cross section onto two sets of temporary winding drums, and then winding the pipe from each of the two sets of temporary winding drums. A method in which rolled U-shaped long steel sections are simultaneously unwound at the same speed so that their opening sides face each other, the openings are matched correctly, and the mating parts are continuously welded to form a long square pipe. It is. [Function] Since the method for manufacturing a long rectangular vibrator according to the present invention is configured as described above, the elongated steel having a U-shaped cross section that constitutes the long rectangular pipe also has a small capacity and is easy to unwind. , it is easy to butt them together, and welding is only required in the longitudinal direction of the square pipe.

[Example] Hereinafter, the present invention will be explained based on the drawings showing the outline of one implementation thereof.

1 to 3, reference numeral (21) is a winding drum that temporarily winds up a long section steel (22) with a U-shaped cross section; A cushioning material (2) is inserted between the long shaped steel (22) to prevent it from sagging.
4) The cushioning material rolled up and stored, (25
) is a winding drum (21), a torque limiter winding motor driven at a predetermined speed and tension, and (26) is a drum pedestal supporting the winding drum.

Further, in FIG. 3, reference numeral (27) is a vertical restraint roller that aligns the top and bottom of two long steel sections (22) with a U-shaped cross section that restrain the top and bottom of the long steel sections (22) that have a U-shaped cross section and are butted against each other. ,
(28) is a long section steel with a U-shaped cross section (22
) are pressure-contact rollers for making the winding drum (21) have a predetermined thickness, and (29) is a pedestal for the winding drum (21).

Note that <9) and (10) are welding torches for welding the abutted portions of the long section steels (22) having a U-shaped cross section.

Next, a method for manufacturing a long rectangular pipe according to the present invention, which is carried out using the above-mentioned apparatus, will be explained.

First, a long section steel (22) with a U-shaped cross section is rolled onto a winding drum (22).
1) Wind it up in order.

In this case, in order to prevent the long steel sections (22) with a U-shaped cross section from rubbing against each other and being scratched, the long steel sections (22)
The cushioning material (24) is rolled in between the turns so that they are stacked up in order toward the outer circumference.

The winding drum (21) is rotatably supported by a drum pedestal (26) and is driven by a winding motor (25) with a torque limiter. The winding drum (21) is rotated so that the circumferential speed of the winding drum (21) is faster than the feeding speed of the long section steel (22) having a U-shaped cross section. A torque limiter with a dimension f is installed on the take-up motor (25) with a lug limiter so that the winding motor (25) does not apply more than necessary to the long shaped steel (22).

Next, the long section steel (22) having a U-shaped cross section is wound onto the winding drum (21) as described above.
1) on its side, place the winding drum (21) on the stand (29).
) Goto': a can be placed and r dried. In addition, the pedestal (29
) is adapted to rotate, and as a result of this rotation, the long pieces *<22) having a U-shaped cross section are rewound and sent out one after another. At this time, the cushioning material (24) is also rewound.

The two sets of long steel sections (22) with a U-shaped cross section that are rewound in this way are butted together in a predetermined state, and the abutted surfaces are welded 1-chi (9). (10 ) to weld and integrate them. At this time, in order to thrust the two long steel sections (22) with a U-shaped cross section into a predetermined state, upper and lower restraint rollers (27) and side restraint rollers (28) are used. align the top and bottom and press the sides to press the butt surfaces together.If welded in this state, welding will result in a tether weld with the same dimensional accuracy as welding short sections without winding or unwinding. You can get a long square pipe.

In the above embodiment, the buffer material (24) was inserted between the long steel sections (22) having a U-shaped cross section, but if the friction of the steel sections does not pose a problem, the buffer material (24) ) does not need to be inserted.

In addition, restraints during welding are provided by upper, lower and side restraint rollers (27).
, (28) and the elongated shape* (22) having a U-shaped cross section may be sandwiched with a plate material.

Furthermore, a long section steel (22
) has large deformation, and the upper, lower and side restraining rollers (27),
(28) If sufficient dimensional accuracy cannot be obtained only by restraint by (28), the long section steel (22) with a U-shaped cross section is deformed before being wound around the winding drum (21) and immediately after being unwound. A shaping machine for correction, such as a roll-forming shaping machine, may be provided. [Effects of the Invention] As described above, according to the present invention, after winding two sets of elongated steel sections each having a U-shaped cross section onto each temporary winding drum, The long rectangular pipes are rolled back at the same time at the same speed so that their openings face each other, and the openings are matched correctly, and the mating parts are continuously welded to form a long rectangular pipe. , there is no need for welding in the longitudinal direction), the welding direction is only in one direction, and the equipment is simple.Moreover, it is possible to sufficiently regulate the vertical direction as well as the thickness direction, and the cost is 1. This has the effect of providing a method for manufacturing long rectangular pipes that can reduce the amount of heat and ensure quality (particularly when a high degree of vacuum is required), and can also produce products with good dimensional accuracy.

[Brief explanation of drawings]

Fig. 1 is a front view showing an example of winding and rewinding for temporary winding of a long section steel with a U-shaped cross section used in one embodiment of the present invention, and Fig. 2 is according to line 1 and 2 in Fig. 1. The schematic cross-sectional view, FIG. 3, shows one embodiment of the present invention for manufacturing a desired long rectangular pipe by unwinding a long section steel having a U-shaped cross section wound by the apparatus shown in FIGS. 1 and 2. Diagram of the manufacturing procedure shown, No. 4
This figure is a perspective view showing a conventional method of manufacturing a square pipe from a conventional flat plate, and FIG. 5 is a perspective view showing a conventional method of manufacturing a short square pipe manufactured by another method into a long square pipe. (9), (10) ・Welding l・-chi, (21)・・
・Temporary winding drum l, (winding drum'). (22)...
Long section steel having a U-shaped cross section, (27)...vertical restraint roller, (28)...side restraint roller. In each figure, the same reference numerals indicate the same or equivalent parts. Agent Dai Iwa Masu Yukon 1 figure duck 2 figure 22 one cross-section U-shaped 0 long celestial shape bamboo duck 3 figure 28-I rule @ j Kuzuka Roichira

Claims (1)

[Claims] After winding up two sets of long steel sections each having a U-shaped cross section onto the temporary winding drums, the long steel sections each having a U-shaped cross section wound from each of the two sets of temporary winding drums are simultaneously rolled at the same speed so that their open sides are mutually connected. A method for manufacturing a long rectangular pipe, characterized by unwinding the pipe so as to face it, aligning the openings correctly, and continuously welding the mating parts.