JPH08155541A - Production of blank oil for continuously producing tapered tube - Google Patents

Abstract

PURPOSE: To improve the yield at the time of producing a coil having a specific blank by mutually relative-shifting both divided coils in the longitudinal direction of the divided coils so as to form a line symmetry related to a matching line of both divided coils in the width of each divided coil and welding both divided coil along the matching line. CONSTITUTION: While passing the original coil 3, a cutting machine 33 is shifted in the direction crossing to the longitudinal direction of the original coil 3 and the center part of the original coil 3 is cut off as zigzag state A to obtain two sheets of the divided coils 4. Then, both divided coils 4 are turned over and these straight edges are mutually matched and mutually relative-shifted in the longitudinal direction thereof and both divided coils 4 are welded along the matching line under the condition, in which the sheet width of each divided coil 4 forms the line symmetry related to the matching line B of both divided coils 4, to make a blank coil 1. The two sheet of the divided coils are produced without developing the cut waste part from the original coil 3, and these straight edges are mutually welded to produce the blank coil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the manufacture of a material coil for continuous production of a tapered pipe, which is suitable for continuously producing a tapered pipe used for a structure requiring an aesthetic appearance such as an illumination column, a sign column, a steel tower and the like. Regarding the method.

[0002]

2. Description of the Related Art As a conventional method for manufacturing a tapered pipe, as described in Japanese Utility Model Laid-Open No. 51-126325, a trapezoidal flat plate is pulled out while being constrained by a pair of rolls having a taper caliber, and the opening edge is pulled out. There is one that is joined and welded by high frequency welding or the like. In order to continuously manufacture a tapered pipe by such a manufacturing method, as a raw material thereof, as shown in FIG.
It is necessary to prepare the material coil 1 having a shape as shown in FIG.

However, in the prior art, in order to manufacture the material coil as shown in FIG. 5, the original coil 3 having a constant plate width is used.
While passing through the plate, the two fusing torches are moved laterally on both sides of the plate width of the original fabric coil, and each side part of the original fabric coil is zigzag cut at a predetermined gradient. As a result, a material coil whose plate width is repeatedly changed with a predetermined taper for each length corresponding to the pipe length of the taper pipe is obtained. In FIG. 5, 3A is a cut-off portion.

[0004]

However, in the prior art, since the cut-off portion 3 is formed in order to obtain the material coil 1 from the original coil 2, the yield is very bad and it is not practical. For example, original diameter 250A x length 10m (taper ratio 1/7
When obtaining the material coil for tapered pipe of 5), the yield loss is about 25%.

According to the present invention, when manufacturing a raw material coil in which the plate width is repeatedly changed from the original roll having a constant plate width by a predetermined taper for each length corresponding to the pipe length of the taper pipe,
The purpose is to improve the yield.

[0006]

DISCLOSURE OF THE INVENTION The present invention provides a method for producing a material coil for continuous production of a tapered pipe, wherein the plate width is repeatedly changed with a predetermined taper for each length corresponding to the length of the tapered pipe. While the original fabric coil is being passed through, a cutting machine that moves across the longitudinal direction of the original fabric coil within the plate width of the original fabric coil zigzags the central portion of the original fabric coil with a predetermined gradient. The original coil is cut to be divided into two split coils, and both split coils are inverted to abut the straight edges of the split coils against each other, and the plate width of each split coil is divided into both split coils. The two split coils are moved relative to each other in their longitudinal direction so as to be axisymmetric with respect to the abutting line of the coil, and both split coils are welded along the abutting line to form a raw material coil. did Than it is.

[0007]

[Action] While passing the original fabric coil, the cutting machine is moved in a direction intersecting the longitudinal direction of the original fabric coil to cut the central portion of the original fabric coil in zigzag to obtain two split coils. Then, both split coils are inverted to abut their straight edges against each other and move relative to each other in the longitudinal direction thereof, and the plate width of each split coil is line-symmetric with respect to the abutting line of both split coils. Both split coils are welded along their abutting lines in the formed state to form a material coil.

As described above, two split coils are manufactured without producing a cut-off portion from the original coil, and straight edges (outer edge portions of the original coil) of the two split coils are welded to each other to form a raw material. Since the coil is manufactured, a material coil having a predetermined taper shape can be manufactured without any loss of yield.

[0009]

EXAMPLE FIG. 1 is a schematic diagram showing a continuous production line of a tapered pipe, FIG. 2 is a schematic diagram showing a production line of a material coil, FIG. 3 is a schematic diagram showing an inverted state of split coils, and FIG. FIG. 5 is a schematic diagram showing a transfer adjustment state, and FIG. 5 is a schematic diagram showing a conventional method.

As shown in FIG. 1, the taper pipe manufacturing apparatus 10 uses a coil 1 as a material. As shown in FIG. 1, the coil 1 has a plate width repeatedly changed with a predetermined taper for each length corresponding to the pipe length (L) of the tapered pipe 2.

The taper pipe manufacturing apparatus 10 has a plurality of pairs of pipe forming rolls 11 ... 12 ... 13 and each pipe forming roll 11
1 to 13, the material coil 1 is passed through, and the forming work positions of the pipe forming rolls 11 to 13 are set to the pipe forming roll 11
By changing the setting according to the change in the plate width of the material coil 1 passing through 13 to 13, the material coil 1 is formed into a tapered tubular molded body 2
Mold into A.

In the taper pipe manufacturing apparatus 10, a plate width detector 21 is installed on the entrance side of the first stand, and a roll setting device 22 is provided on the tube forming rolls 11 to 13 of each stand. The roll setting device 22 obtains the detection result of the plate width detector 21, and determines the forming work position of the tube forming rolls 11 to 13 of each stand in accordance with each plate width part of the material coil 1 reaching each stand. The setting can be changed as described above.

Further, the taper pipe manufacturing apparatus 10 is adapted to obtain the plate passing force of the material coil 1 by the driving force of the pipe forming rolls 11 to 13 of each stand.

The taper pipe manufacturing apparatus 10 has a welding machine 14. The welding machine 14 welds both opposing edges of the tapered tubular molded body 2A. The welding operation position of the welder 14 is provided with an elevating mechanism that moves up and down according to the change in diameter of the tapered tubular molded body 2A. The welding system of the welding machine 14 is
ERW (electrical resistance welding) (thermer tool method) is preferable from the viewpoint of welding speed, but SAW (submerged arc welding) or laser method may be used.

The taper pipe manufacturing apparatus 10 comprises a running cutting machine 1.
Have 5. The running machine 15 is on the exit side of the welding machine 14,
The tapered tubular molded body 2A is cut into predetermined lengths to form a tapered tube 2.

Therefore, the material coil 1 described above is manufactured by the material coil manufacturing apparatus 30.

As shown in FIGS. 2 to 4, the material coil manufacturing apparatus 30 includes a material coil winding device 31 and a material coil winding device 3.
2. Cutting machine 33 equipped with fusing torch such as gas or laser, cutting machine moving device 34, split coil reversing roller 3
5, the split coil transfer adjusting roller 36, and the welding machine 37 such as ERW are provided, and the raw material coil 1 is continuously manufactured as follows.

(1) While passing the raw fabric coil 3 having a constant strip width unwound from the raw fabric coil unwinder 31, the cutting machine moving device 34 moves the raw fabric coil 3 within the plate width of the raw fabric coil 3. With a cutting machine 33 that is moved in a direction (a plate width direction) intersecting the longitudinal direction of, the central portion of the original coil 3 is cut into zigzag A at a predetermined gradient (corresponding to the taper of the material coil 1), and two sheets are cut. Split into split coils 4 and 4 (see FIG. 2).
(A)).

(2) Each of the split coils 4 and 4 is wound around the split coil reversing roller 35 and inverted (FIG. 3),
The straight edges of the split coils 4 and 4 are butted against each other. At the same time, the plate widths of the split coils 4 and 4 are line-symmetric with respect to the abutting line B of the split coils 4 and 4,
The two split coils 4, 4 are moved relative to each other in their longitudinal direction. The above-mentioned relative movement of both split coils 4 and 4 is achieved by winding one split coil 4 around split coil transfer adjusting roller 36 (FIG. 4).

(3) The split coils 4 and 4 are welded along the abutting line B by the welding machine 37 to form the raw material coil 1. The material coil 1 is wound up by the material coil winding machine 32, and is supplied to the taper pipe manufacturing apparatus 10 described above.

The operation of this embodiment will be described below. While passing through the raw fabric coil 3, the cutting machine is moved in a direction intersecting the longitudinal direction of the raw fabric coil 3 to cut the central portion of the raw fabric coil 3 into zigzag A to form two split coils 4.
Get. Then, both split coils 4 are reversed so that their straight edges abut against each other and move relative to each other in the longitudinal direction thereof, and the plate width of each split coil 4 is such that the abutting line B of these split coils 4 is made. The split coils 4 are welded along their abutting lines in a state of being line-symmetrical with respect to the raw coil 1.

As described above, two split coils are manufactured from the original fabric coil 3 without producing a cut-off portion, and the two split coils are manufactured.
The straight edges (outer edges of the original coil) of the divided coils are welded to each other to manufacture the material coil, and the material coil having a predetermined taper shape can be manufactured without any loss of yield. That is, the yield loss of 25 to 50% by the conventional method becomes almost 0% by the method of the present invention.

The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and changes in design within the scope not departing from the gist of the present invention can be made. Even if it exists, it is included in the present invention. For example, the material coil 1 manufactured by the material coil manufacturing device 30 is used to wind the coiler 3
It is also possible to use the taper pipe manufacturing apparatus 10 immediately on-line without winding the film onto the tape.

[0024]

As described above, according to the present invention, a material coil is manufactured from an original roll having a constant strip width, and the strip width is repeatedly changed with a predetermined taper for each length corresponding to the length of the tapered pipe. In that case, the yield can be improved.

[Brief description of drawings]

FIG. 1 is a schematic view showing a continuous production line for tapered pipes.

FIG. 2 is a schematic diagram showing a production line of a material coil.

FIG. 3 is a schematic diagram showing an inverted state of split coils.

FIG. 4 is a schematic diagram showing a transfer adjustment state of split coils.

FIG. 5 is a schematic view showing a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Material coil 3 Raw coil 4 Split coil 30 Material coil manufacturing device 33 Cutting machine 34 Cutting machine moving device 35 Split coil reversing roller 36 Split coil transfer adjusting roller 37 Welding machine

Claims (1)

[Claims] 1. A method of manufacturing a raw material coil for continuous production of a tapered pipe, wherein the plate width is repeatedly changed with a predetermined taper for each length corresponding to the length of the tapered pipe. However, the central portion of the raw fabric coil is zigzag cut at a predetermined gradient by a cutting machine that moves across the longitudinal direction of the raw fabric coil within the plate width of the raw fabric coil to form the raw fabric coil. Split into two split coils, invert each of the split coils to abut the straight edges of the split coils with each other, and the plate width of each split coil is line symmetric with respect to the abutting line of the split coils. Continuous production of a tapered pipe, characterized in that the split coils are moved relative to each other in the longitudinal direction so that the split coils are welded along the abutting line to form a raw material coil. Of manufacturing raw material coil.