JP2003048116A - Cutting equipment and cutting method for steel pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide cutting equipment and cutting method for a steel pipe, capable of reducing the equipment cost and operation cost. SOLUTION: In this steel pipe cutting equipment adapted to discharge a steel pipe product in the same direction as in the carry-in direction, one or more cutters are arranged in series to constitute one cutting line, in which one steel pipe is carried in the axial direction, crops at both ends of the steel pipe are removed, and the steel pipe is cut in an arbitrary length into the maximum number n of steel pipe products. One cutting line has the minimum number of cutters, which is equal to or larger than (n+1)/2, and one gauge stopper provided to be movable in the axial direction of the steel pipe on the discharge side of the steel pipe product rather from the cutter and be retreated from the discharged steel pipe product. Among the plural cutters, the cutter closest to the gauge stopper is fixed in the axial direction of the steel pipe, and the other cutters are provided movably in the axial direction of the steel pipe. This cutting method for the steel pipe adopts the above cutting equipment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel pipe cutting facility and a cutting method for cutting and removing the crops at both ends of a single manufactured steel pipe to cut into a plurality of product steel pipes having an arbitrary length.

[0002]

2. Description of the Related Art A conventional steel pipe cutting equipment and cutting method will be described with reference to FIGS. FIG. 3 is an explanatory view of the arrangement of a steel pipe cutting facility for cutting and removing the crops at both ends of one manufactured steel pipe to cut into a plurality of product steel pipes having an arbitrary length, and FIG. 4 is shown in FIG. It is explanatory drawing of the cutting method of the steel pipe which uses the cutting equipment shown.

Generally, a steel pipe (hereinafter referred to as "pipe") 2 such as a seamless steel pipe manufactured by a mill is cut into a predetermined length with high efficiency by milling, and a product steel pipe (hereinafter referred to as "product pipe"). ) Steel pipe cutting equipment (hereinafter,
A cutting device 4 equipped with a cutting head 5 equipped with a metal saw and a pipe clamp device 6 is installed in series in the axial direction of the pipe 2 to form a cutting line. The pipe 2 is loaded in the axial direction.

One of the cutting devices 4 is of a fixed type, and the other cutting device 4 is movable in the carrying-in direction of the pipe 2, that is, the axial direction of the pipe 2, since it corresponds to an arbitrary cutting length of the pipe 2. is set up. The cutting line 03 as described above is provided with one line or a plurality of lines corresponding to the manufacturing capacity of the mill.

FIG. 3 shows an example of the arrangement of the conventional cutting line 03. The removal of crops at both ends of one pipe 2 and the pipe 2 having a maximum of 5 product pipes 2-1 to 2-1.
This is an example in which two cutting lines for cutting into 2-5 are provided.

In FIG. 3, 1 is a mill exit side table, 2
Is a pipe to be cut, and 03 is a cutting line, and six cutting devices 4-1 to 4-6 are installed to remove the crops at both ends of the pipe 2 and cut into five. (Hereinafter, when the individual cutting devices are not particularly distinguished, the reference numeral "4" is used, and when referring to the individual cutting devices, the reference numerals "4-1" to "4-6" are used.) A cutting head 5 equipped with a metal saw and a pipe clamp device 6 are mounted. Reference numeral 8 is a cutting line delivery side table for discharging the cut product pipes 2-1 to 2-5.

Reference numerals 03 'and 8'represent the other cutting line and the cutting line delivery side table, which are arranged in parallel with the cutting line 03 and the cutting line delivery side table 8 in correspondence with the manufacturing capacity of the mill.

A method of cutting a steel pipe by the conventional cutting line 03 arranged as described above will be described with reference to FIG. As shown in FIG. 4 (a), the pipe 2 manufactured by a mill
Is carried into the cutting line 03 from the mill outlet table 1, the cutting position of the leading crop 9 of the pipe 2 is fixed to the fixed cutting device 4-positioned on the most downstream side in the traveling direction of the pipe 2.
According to the cutting position of 1, the pipe 2 is a fixed cutting device 4-1.
It is clamped by the pipe clamp device 6 mounted on the.

The other cutting devices are movable cutting devices 4-2, 4-3, 4-4, 4-5, 4 which are movable in the axial direction of the pipe 2.
-6, each of which is a predetermined product pipe 2-1
2-5 are moved to a predetermined position according to the length, and at the same time as the operation of the fixed cutting device 4-1, the pipes are clamped by the pipe clamp devices 6 mounted on the respective moving cutting devices 4-2-4-6. Clamp 2

Next, as shown in FIG. 4B, the six cutting devices 4 actuate the cutting heads 5 simultaneously to cut the pipe 2 from both sides.

As shown in FIG. 4 (c), the cut pipe 2 has the crops 9 and 10 separated and removed, and the product pipe 2-
1 to 2-5 are discharged from the cutting line 03 in the same direction as the loading direction of the pipe 2, and the cutting line exit side table 8
Will be transported in.

[0012]

In the case of the conventional steel pipe cutting apparatus and cutting method described above, the number of the cutting lines is 1
When cropping two pipes at both ends and cutting into n product pipes, n + 1 cutting devices are always required, which is efficient in that the pipes can be cut at one time, but the equipment cost is high. There is.

It is an object of the present invention to provide a steel pipe cutting equipment and a cutting method which can solve the above problems of the conventional steel pipe cutting device and cutting method and can reduce the equipment cost and the operating cost. It is a thing.

[0014]

(1) The present invention has been made in order to solve the above-mentioned problems.
As a means of arranging, a plurality of cutting devices are arranged in series to form one line of cutting line, one steel pipe is carried in the axial direction, the crops at both ends of the steel pipe are removed, and a maximum of n arbitrary lengths are removed. In a steel pipe cutting facility for cutting into the product steel pipe of No. 1 and discharging the product steel pipe in the same direction as the carrying-in direction, the one line of the cutting line is (n + 1) / 2 or more and the minimum number of cutting devices. , A single gauge stopper provided on the discharge side of the product steel pipe from the cutting device so as to be movable in the axial direction of the steel pipe and retractable from the product steel pipe discharged, Among them, a cutting device on the side closest to the gauge stopper is fixedly provided in the axial direction of the steel pipe, and another cutting device is provided so as to be movable in the axial direction of the steel pipe. provide.

In the conventional equipment, when removing the crops at both ends of one steel pipe and cutting into n product steel pipes, (n + 1) cutting devices 4 are necessarily required, and the steel pipes can be cut at one time. According to the first means, when the cost is high but the equipment cost is high, when the crops at both ends of one steel pipe are removed to cut into n product steel pipes, ( A minimum number of cutting devices (n + 1) / 2 or more and one gauge stopper can be used.

(2) As a second means, in the steel pipe cutting equipment of the first means, the maximum number n of the product steel pipes is 5 or 4, and the one line of the cutting line has three cutting lines. There is provided a steel pipe cutting facility comprising a device and one gauge stopper.

According to the second means, the function of the first means can be obtained in the cutting equipment for steel pipes in which the maximum number n of product steel pipes which is often adopted is 5 or 4.

(3) As a third means, in the method for cutting a steel pipe in which the crops at both ends of one steel pipe are removed to cut into n product steel pipes of arbitrary length, the first means or Using the steel pipe cutting equipment of the second means, the steel pipe is cut by the cutting device of the number, and then the leading end of the rest of the steel pipe is brought into contact with the gauge stopper to cut by the cutting device of the number. A method for cutting a steel pipe is provided.

According to the third means, by the action of the first means or the second means, when the crops at both ends of one steel pipe are removed and a plurality of product steel pipes are cut, a smaller number of units than the conventional method is used. A cutting device and one gauge stopper can be used.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A steel pipe cutting apparatus and a cutting method according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is an explanatory diagram of an arrangement of a steel pipe cutting equipment according to the present embodiment, and FIG. 2 is an explanatory diagram of a steel pipe cutting method using the cutting equipment shown in FIG. 1.

In FIG. 1, a steel pipe cutting facility (cutting line) 3 of the present embodiment for cutting and removing the crops at both ends of one manufactured pipe to cut into a plurality of product pipes of arbitrary length. Is provided with two lines. In FIGS. 1 and 2, the same functions as those in FIGS. 3 and 4 described above are denoted by the same reference numerals.

In the cutting line 3 of this embodiment, when one pipe 2 is cut at both ends and cut into a maximum of n product pipes, the configuration of one line is (n + 1) / 2 or more and the minimum number of pipes. (I.e., (n + 1) / 2 fractions are rounded up) and one gauge stopper. In FIG. 1, the maximum number n of product pipes that is often adopted is 5. It is an example of a steel pipe cutting facility.

In FIG. 1, 1 is a mill outlet table, 2
Is a pipe to be cut, 3 is a cutting line, and the cutting line 3 has three cutting devices 4 and the pipe 2 from the cutting device 4.
Of the product pipes 2-1 to 2 in the downstream direction of the loading
A gauge stopper 7 is installed on the discharge side of -5. The gauge stopper 7 is movable in the carrying-in direction of the pipe 2, that is, the axial direction of the pipe 2 and is a cut product pipe 2-1.
It is installed so that it can be retracted from the product pipe at the time of discharge of 2-5.

The cutting device 4 is equipped with a cutting head 5 and a pipe clamp device 6 each equipped with a metal saw. From the downstream side, a fixed cutting device 4-1 and a moving cutting device 4 are installed.
-2, three moving cutting devices 4-3 are provided in this order.
The fixed cutting device 4-1 is provided so as to be fixed in the carrying-in direction of the pipe 2, that is, the axial direction of the pipe 2, and the moving cutting devices 4-2 and 4-3 are provided in the carrying-in direction of the pipe 2, that is, the pipe 2. It is provided so as to be movable in the axial direction.

8 is a cut product pipe 2-1 to 2-5
Is a cutting line delivery side table that discharges from the cutting line 3.

Reference numerals 3'and 8'represent the other cutting line and the cutting line delivery side table, which are arranged in parallel with the cutting line 3 and the cutting line delivery side table 8 in accordance with the manufacturing capacity of the mill.

A method of cutting a steel pipe by the conventional cutting line 3 arranged as described above will be described with reference to FIG.
As shown in FIG. 2 (a), a pipe 2 manufactured by a mill has a cutting line 3 extending in the axial direction from a mill outlet table 1.
When it is carried in, first, the cutting position of the leading crop 9 of the pipe 2 is aligned with the cutting position of the fixed cutting device 4-1, and is clamped by the pipe clamp device 6 mounted on the fixed cutting device 4-1. The moving cutting devices 4-2 and 4-3 of FIG. 4 are moved to predetermined positions according to the cutting pipe lengths of the product pipes 2-1 and 2-2 which are predetermined, and the fixed cutting device 4-
Simultaneously with the operation of the first pipe clamp device 6, the pipe 2 is clamped by the pipe clamp device 6 mounted on each moving and cutting device.

Next, as shown in FIG. 2 (b), the three cutting devices 4-1 to 4-3 actuate the cutting heads 5 simultaneously to cut the pipe 2.

The cut product pipes 2-1 and 2-2 have the crop 9 on the tip side separated and removed, and as shown in FIG. 2 (c), in the same direction as the carrying-in direction of the pipe 2 from the cutting line 3. The sheet is discharged and conveyed on the cutting line output side table 8. At this time, the gauge stopper 7 is previously fixed to the cutting device 4-.
It retreats from the product pipes 2-1 and 2-2 at a position moved to the downstream side by the length of the product pipe 2-3 from 1.

At the same time as this discharging operation, as shown in FIG. 2 (d), the remaining pipe 2 is advanced, and the leading end of the remaining pipe 2 to be the product pipe 2-3 is brought into contact with the gauge stopper 7 and moved. The cutting devices 4-2 and 4-3 are moved to predetermined positions according to the predetermined lengths of the product pipes 2-4 and 2-5, and the pipe clamp device 6 mounted on each of the three cutting devices 4 is used. Clamp the pipe 2.

Then, as shown in FIG. 2 (e), the three cutting devices 4 again actuate the cutting heads 5 simultaneously to cut the remaining part of the pipe 2.

After that, as shown in FIG. 2 (f), the cut product pipes 2-3, 2-4, 2-5 are separated and removed from the rear end side crop 10, and the pipe 2 is carried in the direction. It is discharged from the cutting line 3 in the same direction as and is conveyed by the cutting line exit side table 8.

The above is the case of cutting n = 5 at maximum and cutting n = 5. However, when n = 4 or 3, the rear end of the second pipe is not cut. Also, n = 2 or 1
In the case of a book, only the first cutting is completed.

Table 1 shows the effects of the steel pipe cutting equipment and the cutting method according to the present embodiment as compared with the prior art shown in FIGS. 3 and 4.

[0035]

[Table 1]

In the table, the cutting line 3 alone is evaluated in order to make the specifications of the mill and the cutting line, etc., such that the respective capacities are consistent. The equipment cost, the cutting time, and the numerical value for comparison were obtained by the equipment configuration and the cutting method shown in FIGS. 1 and 2 above. The values shown in comparison are for one line.

As shown in Table 1, the unit price of the cutting device 4 is 1.
If the unit price of the gauge stopper 7 is 0.2a and the unit cost of the gauge stopper 7 is 0.2a, the equipment cost is 6.0a in the conventional technique. The equipment cost is 3.2a because the number of units has been halved, and the equipment cost of the present embodiment is 0.53 when the conventional technique is 1.00.

Further, in the case of the prior art, it takes a total of 60 seconds for 20 seconds for pipe loading, 20 seconds for cutting, and 20 seconds for pipe discharging to process one pipe 2, but in the case of the present embodiment,
Pipe loading 20 seconds, cutting 20 seconds, intermediate discharge 10 seconds, cutting 20 seconds, pipe discharging 10 seconds, totaling 80 seconds.

That is, the cutting efficiency is 1.00 in the conventional technique.
If so, the present embodiment will be 0.75. From the relationship between the equipment cost and the cutting efficiency, the equipment cost / cutting efficiency is 0.71 in this embodiment when the conventional technology is 1.00, which is about 3
It becomes 0% economical.

In the above-mentioned prior art cutting line 03, 1
When removing the crops 9 and 10 on both ends of the pipe 2 to cut into n product pipes, (n + 1) cutting devices 4 are necessarily required, which is efficient in that the pipe 2 can be cut at one time. However, the equipment cost is high. However, when the cutting line 3 is configured as in the above embodiment of the present invention,
When cutting one pipe 2 into n product pipes by removing the crops 9 and 10 at both ends, (n + 1) / 2 (fractions are rounded up) cutting devices 4 and one gauge stopper 7
It is possible to deal with, and the equipment cost can be reduced. Further, the equipment configuration of the present embodiment can be applied to a cutting method in which the crops 9 and 10 at both ends are not removed.

Although the above description has been made on the seamless steel pipe, the present invention can be applied to a welded steel pipe and the same effect can be obtained.

Although the embodiments of the present invention have been described above, it is needless to say that the present invention is not limited to the above-mentioned embodiments, and various modifications may be made to the concrete structure within the scope of the present invention. .

[0043]

(1) According to the invention of claim 1, the steel pipe cutting equipment comprises a plurality of cutting devices arranged in series to form a row of cutting lines, and one steel pipe is arranged in the axial direction thereof. In the cutting equipment for steel pipes, the steel pipes are carried into a pipe and the crops at both ends of the steel pipes are removed to cut up to n product steel pipes of arbitrary length, and the product steel pipes are discharged in the same direction as the carry-in direction. The cutting line of (n + 1) / 2 or more is the minimum number of cutting devices, and is movable from the cutting device to the discharge side of the product steel pipe in the axial direction of the steel pipe and can be retracted from the discharged product steel pipe. One gauge stopper provided, and the cutting device closest to the gauge stopper among the plurality of cutting devices is fixedly provided in the axial direction of the steel pipe, and another cutting device is provided for the steel pipe. Since it is configured to be movable in the axial direction, In the conventional equipment, when removing the crops at both ends of one steel pipe and cutting into n product steel pipes, (n + 1) cutting devices are always required and the equipment cost becomes (n + 1) / With a minimum of two or more cutting devices and a single gauge stopper, the equipment cost can be reduced and the equipment cost / cutting efficiency can be improved to reduce the operating cost.

(2) According to the invention of claim 2, claim 1
In the cutting equipment for steel pipes according to [4], the maximum number n of the product steel pipes is 5 or 4, and the cutting line in one row is 3
A cutting equipment for steel pipes having a maximum number n of product steel pipes of 5 or 4 which is often adopted because it is configured to have one cutting device and one gauge stopper. What has the effect of the invention is obtained.

(3) According to the invention of claim 3, the method for cutting a steel pipe is a method for cutting steel pipes by removing the crops at both ends of one steel pipe and cutting into n product steel pipes of arbitrary length. Using the steel pipe cutting equipment according to claim 1 or 2, the steel pipe is cut by the cutting device of the number of units, and then the leading end of the rest of the steel pipe is brought into contact with the gauge stopper. Since it is configured to cut with the cutting device of claim 1, due to the effect of the invention of claim 1 or claim 2, when the crops at both ends of one steel pipe are removed and a plurality of product steel pipes are cut, a smaller number of units than the conventional method is used. The cutting device and one gauge stopper can be used to improve the equipment cost / cutting efficiency and reduce the operating cost.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an arrangement of a steel pipe cutting facility according to an embodiment of the present invention.

2 is an explanatory view of a method for cutting a steel pipe using the steel pipe cutting equipment of FIG. 1. FIG.

FIG. 3 is an explanatory view of the arrangement of conventional steel pipe cutting equipment.

4 is an explanatory view of a method of cutting a steel pipe using the steel pipe cutting equipment of FIG.

[Explanation of symbols]

1 mil outlet table 2 pipes 2-1, 2-2, 2-3, 2-4, 2-6 Product pipe 3,3 'cutting line 4 cutting device 4-1 Fixed cutting device 4-2, 4-3, 4-5, 4-6 moving cutting device 5 cutting head 6 Pipe clamp device 7 gauge stopper 8, 8'Cutting line outlet table 9, 10 crops

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Junichiro Murakami             Hiroshima Prefecture Mihara City Itozakicho 5007 Mitsubishi Heavy Industries             Mihara Machinery & Transportation Systems Factory (72) Inventor Norihiko Iwamoto             Sumitomo Metal Works, 1850 Minato, Wakayama, Wakayama Prefecture             Wakayama Steel Works Co., Ltd. F-term (reference) 3C039 EA12

Claims (3)

[Claims] 1. A plurality of cutting devices are arranged in series to form one row of cutting lines, one steel pipe is loaded in the axial direction thereof, and the crops at both ends of the steel pipe are removed to remove a maximum of n arbitrary pipes. In a steel pipe cutting facility that cuts a product steel pipe of a length and discharges the same product steel pipe in the same direction as the loading direction, the one row cutting line has a minimum number of cutting devices of (n + 1) / 2 or more. And one gauge stopper provided on the discharge side of the product steel pipe from the cutting device so as to be movable in the axial direction of the steel pipe and retractable from the discharged product steel pipe. Among them, a cutting device closest to the gauge stopper is fixedly provided in the axial direction of the steel pipe, and another cutting device is provided so as to be movable in the axial direction of the steel pipe. . 2. The steel pipe cutting equipment according to claim 1, wherein the maximum number n of the product steel pipes is 5 or 4, and the one cutting line has three cutting devices and one gauge. A steel pipe cutting facility having a stopper. 3. A steel pipe is provided with n-crop at both ends.
In a method for cutting a steel pipe for cutting a product steel pipe of an arbitrary length of a book, the steel pipe cutting equipment according to claim 1 or 2 is used to cut the steel pipe with the cutting device of the number, A method for cutting a steel pipe, characterized in that the leading end of the remaining portion of the same steel pipe is brought into contact with the gauge stopper, and the steel pipe is cut by the above-mentioned number of cutting devices.