JPH08197241A - Manufacture of tubular vessel and tubular vessel - Google Patents

Abstract

PURPOSE: To easily manufacture. a tubular vessel by unneccessitating the deform correcting work for a flange. CONSTITUTION: At the time of welding the flange 2 to a barrel tube 1 after forming a groove working part 2b having the size according to the deformed rate caused by welding to the end part of each of the flanges 2, 2, each flange 2 is made to be the inclined and deformed state at the angle according to the groove working part 2b. Thereafter, at the time of welding a divided tube 3 to the barrel tube 1, the part, in which the divided tube 3 in the barrel tube 1 exists, is stretched to the divided tube 3 side, and in consequence, each of the flanges 2, 2 and the barrel tube 1 are combined in a straight condition. Therefore, the deformation of the flange 2 can be prevented even if the tubular vessel is formed by fitting the flange 2 and the divided tube 3 to the barrel tube 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubular container made of aluminum alloy and a method for manufacturing the same, and more particularly to a container suitable for forming a flange and a branch pipe on a body pipe by welding.

[0002]

2. Description of the Related Art Conventionally, when a container made of an aluminum alloy is manufactured, a barrel pipe, a flange and a branch pipe are prepared, flanges are attached to both ends of the barrel pipe by welding, and then a branch pipe is provided at an intermediate position of the barrel pipe. To form a container by attaching the by welding. In this case, since the container is deformed by welding, it was necessary to shape the container.

As a conventional technique of this type, Japanese Patent Laid-Open No.
-200887 publication is mentioned.

[0004]

By the way, the above-mentioned prior art is made of aluminum alloy, though when iron is used as the material, the deformation generated after welding can be easily corrected. Since it is formed, it is necessary to correct the deformation after welding, which causes a problem that a lot of labor is required.

Further, when correcting the deformation after welding, it is easily conceivable to correct it by machining. For example,
The flange to be connected to the body tube is formed thick in advance, the thick flange is welded, and then the flange is machined to be flat, so that the deformation can be absorbed by the amount of machining allowance of the flange. It is possible to do so. However, in that case, since the flange is formed thick in advance, there is a problem that the material cost is correspondingly increased. Moreover, when the containers are completed, the flange plate thickness will vary greatly.Therefore, when connecting containers together or when it is necessary to attach a cover or the like to the container flanges with bolts, the flange plate thickness difference It is necessary to select and use bolts of different lengths one by one, which is troublesome and time-consuming, and there is a possibility that the tightening of the bolts may be deteriorated.

In view of the above-mentioned problems of the prior art, an object of the present invention is to provide a method for manufacturing a tubular container, which makes it unnecessary to correct the deformation of the flange after welding and can be manufactured easily and reliably. In particular, another object is to provide a tubular container capable of accurately carrying out the above method.

[0007]

In the method of the present invention,
In advance, from the position corresponding to the part where the branch pipe of the body tube is attached to the position where the body tube is abutted on the end surface of the flange,
A flange having a grooved portion that has a grooved portion that gradually increases in depth along the periphery of the body tube and that can absorb the amount of deformation generated by welding, and that has a grooved portion that gradually increases in depth. Is attached to one end of the body pipe by welding, and then a branch pipe is attached to the middle position of the body pipe by welding to form the branch pipe.

In the tubular container of the present invention, a long body tube, a flange attached to at least one end of the body tube by welding, and a branch pipe attached to an intermediate position of the body tube by welding in a crossing direction. And a position on the end face of the flange that abuts the barrel pipe, from a position corresponding to the portion where the branch pipe of the barrel pipe is mounted to a position opposite to the corresponding position along the circumference of the barrel pipe. Accordingly, the groove is gradually increased in depth and a grooved portion capable of absorbing the deformation amount caused by welding is formed.

[0009]

In the method of the present invention, as described above, a grooved portion having a size corresponding to the amount of deformation by welding is formed in advance on the end surface of the flange, and the flange having the grooved portion is attached to one end of the body tube. It is attached by welding, and then the branch pipe is attached by welding to the attachment hole for the branch pipe at an intermediate position of the body pipe.Therefore, when the flange is attached to the body pipe by welding, the flange has an angle corresponding to the grooved part. However, if the branch pipe is attached to the body pipe by welding after that, the portion where the branch pipe exists in the body pipe is pulled to the branch pipe side by the welding. Therefore, the central axes of the flange and the body tube are assembled almost straight to each other.

Therefore, even if the tubular container is formed by attaching the flange and the branch pipe to the body tube, the container can be prevented from being deformed, and thus the labor for correcting the deformation unlike the prior art is unnecessary. Not only is it unnecessary to shape by thick machining using a thick flange, but it is possible to manufacture extremely easily.

Further, according to the present invention, there is provided a long tubular body, a flange attached to at least one end of the tubular tube by welding, and a branch pipe attached to an intermediate position of the tubular tube by welding in a crossing direction. Then, at the position where the barrel pipe is abutted on the end face of the flange, the depth gradually increases from the position corresponding to the portion where the branch pipe of the barrel pipe is mounted to the position opposite to the corresponding position along the periphery of the barrel pipe. Since the grooved portion that gradually increases in size and can absorb the amount of deformation caused by welding is formed, the above method can be accurately performed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an explanatory view showing an embodiment of a method of manufacturing a tubular container according to the present invention in the order of steps, FIG. 2 is an enlarged view showing a main part of a joint between a tubular container and a flange, and FIG. 3 is a tubular container at the time of joining. Fig. 4 is an explanatory view showing the dimensions of each part in Fig. 3, Fig. 5 is a schematic view showing a gas insulated switchgear to which a tubular container is applied, and Fig. 6 shows a part used in the gas insulated switchgear. It is sectional drawing which shows the tubular container crossed along the AA line.

Before explaining the method of the present invention, a gas insulated switchgear (hereinafter abbreviated as GIS) using a tubular container produced by the method of the present invention will be described.
As shown in FIG. 5, it is composed of a unit including a tank 9 having a circuit breaker 5, a bus bar 6, a disconnector 7, and a lightning arrester 8.
Each of these units 6 to 9 has a tubular container of aluminum synthetic gold called a sheath 10. As shown in FIG. 6, the tubular container forming the sheath 10 has a main circuit conductive portion 11 inside.
And an insulator 12 that supports the conductive portion 11, and has a structure in which SF6 gas having a high insulating property is sealed.

Next, a method of manufacturing the tubular container of the embodiment will be described. First, the tubular container is a long cylindrical tube 1 having a cylindrical shape, and flanges 2 attached to both ends of the tube 1, respectively. 2 and a branch pipe 3 attached to a middle position of the body pipe 1.

Here, each flange 2 is previously provided with an insertion hole 2a as shown in FIG. 2 so as to have the following dimensions similar to the inner diameter of the body tube 1. Further, each of the flanges 2 is formed with an inclined grooved portion 2b at an end portion corresponding to both end surfaces of the body tube 1, respectively. When the flanges 2 are attached to both end surfaces of the body tube 1 by welding, the grooved portion 2b is welded in a state where the body tube 1 and the flange 2 are abutted. As shown in FIG. 1C, the end portion of the body tube 1 is formed so as to gradually bite into the end portion of the flange 2 from the upper portion of the body tube 1 to the lower portion on the opposite side. That is, when the flanges 2 are attached to both end surfaces of the body tube 1 by welding, the grooved portion 2b is for absorbing the deformation even if the flange 2 is deformed by the welding. Specifically, in the end faces of the end faces of the respective flanges 2 against which the body tube 1 is abutted, as shown in FIGS.
As shown in FIG. 2, the depth is gradually increased from the upper part to the lower part along the outer circumference of the flange. Therefore, the depth of the upper part of the flange 2 is set to 0, and the depth from the lower part to the lower part. The depth is increasing as it reaches.

Then, the flanges 2 and 2 having such grooved portions 2b are butted against each other as shown in FIG. 1 (c) and welded over the entire circumference in this state, whereby the body tube 1 and the flanges 2 and 2 are welded. And are installed. At that time, the flange 2 and the body tube 1 are attached so that the center axis of the body tube 1 is aligned with the center axis of the grooved portion 2b, and therefore the grooved portion 2b is used as a reference.

Next, as shown in FIG. 1 (d), a branch pipe 3 is provided at an upper portion of the middle of the body pipe 1 having the flanges 2 and 2.
A mounting hole 1a is formed for mounting. The branch pipe 3
It is for connecting a tubular container as another sheath to this, and has a flange 4 at the upper end.

After that, the mounting hole 1a of the body tube 1 and the branch pipe 3 are positioned, and the entire circumference thereof is welded to mount the branch pipe 3, whereby a tubular body made of an aluminum alloy as shown in FIG. 1 (e). Form a container. In this case, the tubular container has heat due to welding, but if this is cooled by natural cooling or the like, the tensile force at the time of welding the branch pipe 3 acts on the upper portion of the body tube 1, resulting in the body tube 1 And the flanges 2 and 2 arranged at both ends thereof are deformed so that their axial directions substantially coincide with each other. Therefore, the grooved portion 2b provided at the end of each flange 2 has a depth capable of absorbing the amount of deformation applied by welding.

In the embodiment, as described above, the grooved portion 2b having a size corresponding to the amount of deformation by welding is formed at the end of each flange 2, 2 in advance, and the flange having the grooved portion 2b is formed. 2, 2 are attached to both ends of the body pipe 1 by welding, and then a mounting hole 1b for the branch pipe is formed in the upper part of the middle position of the body pipe 1, and then the branch pipe 3 is installed in the mounting hole 1b of the body pipe 1.
When they are attached by welding and then cooled, the flanges 2 and 2 and the body tube 1 are formed so that their axial directions substantially coincide with each other.

The reason is that the grooved portion 2 is previously formed on the flange 2.
When b is formed, when the flange 2 is attached to the body tube 1 by welding, each flange 2 is inclined and deformed at an angle corresponding to the grooved portion 13, but after that,
When the branch pipe 3 is attached to the body pipe 1 by welding, the welding causes the portion of the body pipe 1 where the branch pipe 3 is present to be pulled toward the branch pipe 3 side.
This is due to the fact that 2 and the body tube 1 are assembled straightly.

Therefore, even if a tubular container is formed by attaching the flange 2 and the branch pipe 3 to the body tube 1, it is possible to prevent the container from being deformed. Therefore, it is troublesome to correct the deformation as in the prior art. Not only is it unnecessary, but also it is not necessary to use a thick flange to perform shaping by machining or the like, and it is possible to manufacture extremely easily. Moreover, when the flange 2 and the body tube 1 are attached, if the surface of the flange 2 having the grooved portion 2b is welded as a reference surface, the center axis of the grooved portion 2b and the center axis of the body tube 1 are significantly displaced. Can be prevented.

According to experiments, as shown in FIG. 3, for example, when a tubular container is formed by a body tube 1 having an inner diameter of 530 mm, flanges 2 and 2 having an outer diameter of 700 mm, and a branch tube 3 having an inner diameter of 530 mm, the flange 2 is formed. , 2 formed in groove 2b
If the value of A-Z row and B-Z row as shown in FIG. 4 is set as the value of, the error between the upper end and the lower end of each flange 2 is finally the value of A-Y and B-Y. It was confirmed that Therefore, it can be understood that the respective axial centers of the flanges 2 and 2 and the body tube 1 are substantially the same, but those values are basically the inner diameter, the thickness, the length of the body tube 1 and the outer shape of the flange 2. Since these slightly vary depending on the thickness, the inner diameter of the branch pipe, the size of the flange 4 of the flange branch pipe, and the like, it is natural to consider these dimensions.

In the illustrated embodiment, since the branch pipe 3 is attached to the upper part of the intermediate position of the body pipe 1, the grooved portion 2b provided on the flange 2 serves as the grooved portion 2b along the periphery from the upper part to the lower part. Although an example in which the branch pipe 3 is formed in a shape in which the depth gradually increases in accordance with the above, when the branch pipe 3 is attached to the lower part of the middle position of the body pipe, as the flange end surface extends from the lower part to the upper part along the periphery, It goes without saying that the depth is gradually increased.
Further, in the illustrated embodiment, the example in which the flanges 2 and 2 are attached to both ends of the body tube has been shown, but it is needless to say that the same action and effect can be obtained by using one flange 2.

[0024]

As described above, the claims 1 and 2 of the present invention are as follows.
According to 2, a grooved portion having a size corresponding to the amount of deformation by welding is formed in advance on the end surface of the flange, and when the flange is attached to the body tube by welding, the flange corresponds to the grooved portion. Although it will be inclined and deformed at an angle, if the branch pipe is attached to the barrel pipe by welding after that, the portion where the branch pipe is present in the barrel pipe is pulled to the branch pipe side by the welding, As a result, since the central axes of the flange and the body tube are assembled almost straight to each other, even if a tubular container is formed by attaching the flange and the branch pipe to the body tube, the container is Since it can be prevented from being deformed, not only the labor for correcting the deformation as in the prior art becomes unnecessary, but also the shaping by machining etc. using a thick flange becomes unnecessary, resulting in extremely There is an effect that can be made to ease.

Further, according to the third aspect, since the flange and the body tube are mounted on the basis of the grooved portion of the flange, the center axis of the grooved portion 2b and the center axis of the body tube 1 are not significantly displaced. There is an effect that it can be prevented and can be manufactured accurately.

Further, according to a fourth aspect, a long tubular body, a flange attached by welding to at least one end of the tubular body, and a branch attached by welding in a cross direction at an intermediate position of the tubular tube. A pipe, at a position where the barrel pipe abuts on the end face of the flange, from a position corresponding to the portion where the branch pipe of the barrel pipe is mounted, to a position opposite to the corresponding position along the circumference of the barrel pipe. Since the grooved portion is formed in which the depth gradually increases and the amount of deformation caused by welding is absorbed, the above-described method can be appropriately performed.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a method of manufacturing a tubular container according to the present invention in the order of steps.

FIG. 2 is an enlarged view of a Z portion in FIG. 1 showing a main part of a joint portion between a tubular container and a flange.

FIG. 3 is an explanatory view showing a tubular container at the time of joining.

FIG. 4 is an explanatory diagram showing dimensions of each part in FIG.

FIG. 5 is a schematic view showing a gas-insulated switchgear to which a tubular container is applied.

FIG. 6 is a cross-sectional view showing a tubular container partly used in the gas insulated switchgear and having a cross section taken along line BB.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Body tube, 1a ... Attachment hole for branch pipe, 2 ... Flange, 2
a ... insertion hole, 2b ... grooved portion, 3 ... branch pipe.

Continuation of front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication B23K 31/00 F H02B 13/02 (72) Inventor Masayoshi Hashiura 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture Stock company Hitachi Kokubun factory (72) Inventor Shinichi Kanishi 1-1-1, Kokubun-cho, Hitachi City, Ibaraki Prefecture Stock company Hitachi Kokubun factory (72) Inventor Hideaki Kikuchi 1-1, Kokubun-cho, Hitachi City, Ibaraki Prefecture No. 1 Inside the Kokubun Plant of Hitachi, Ltd. (72) Inventor Mitsutaka Yang Chopstick 1-1-1 Kokubuncho, Hitachi City, Ibaraki Prefecture Inside the Kokubun Plant of Hitachi, Ltd. (72) Inventor Yoshimitsu Togashi Kokubuncho, Hitachi City, Ibaraki Prefecture 1-1-1 Hitachi Kokubun Plant, Hitachi, Ltd.

Claims (4)

[Claims] 1. A tubular container having an elongated body tube, a flange attached by welding to at least one end of the body tube, and a branch tube attached by welding in an intersecting direction at an intermediate position of the body tube. In the manufacturing method, from the position corresponding to the portion where the branch pipe of the body tube is attached to the position where the body tube is abutted on the end face of the flange, to the position opposite to the corresponding position along the circumference of the body tube in advance. According to this, the depth gradually increases and a grooved portion capable of absorbing the amount of deformation caused by welding is formed, and a flange having the grooved portion is attached to one end of the body tube by welding, and then at a midway position of the body tube. A method for manufacturing a tubular container, characterized in that a branch pipe is attached and formed by welding. 2. An elongated body tube, a flange attached to at least one end of the body tube by welding, and a branch tube attached to an intermediate position of the body tube by welding in a direction intersecting the axial direction of the body tube. In the method for manufacturing a tubular container made of an aluminum alloy having, in advance, at a position where the barrel tube of the end face of the flange is abutted, from a position corresponding to a portion where the branch tube of the barrel tube is mounted, along the circumference of the barrel tube, A grooved portion having a depth that gradually increases toward the position opposite to the corresponding position and has a size capable of absorbing the deformation generated during welding is formed in advance. Attach one end of the pipe by welding, then form a mounting hole for the branch pipe in the middle of the body pipe, then attach the branch pipe by welding in the mounting hole of the body pipe to assemble the tubular container, and then cool the flange. And the axial center of the body tube A method for manufacturing a tubular container, characterized in that they match each other. 3. A long tube, a flange attached to at least one end of the tube by welding, and a branch tube attached to the middle of the tube by welding in a direction intersecting the axial direction of the tube. In the method for manufacturing a tubular container made of an aluminum alloy having, in advance, at a position where the barrel tube of the end face of the flange is abutted, from a position corresponding to a portion where the branch tube of the barrel tube is mounted, along the circumference of the barrel tube, A grooved portion having a depth that gradually increases toward the position opposite to the corresponding position and has a size capable of absorbing the deformation generated during welding is formed in advance. One end of the pipe is attached by welding using the surface of the flange having the grooved portion as a reference surface, then a branch pipe mounting hole is formed at an intermediate position of the barrel pipe, and then the branch pipe is mounted in the mounting hole of the barrel pipe. Attached by welding and tubular A method for manufacturing a tubular container, characterized in that the axis of the flange and the barrel tube are substantially aligned after the container is assembled and cooled. 4. An elongated body tube, a flange attached to at least one end of the body tube by welding, and a branch pipe attached to an intermediate position of the body tube by welding in a direction intersecting the axial direction of the body tube. And a position on the end face of the flange that abuts the barrel pipe, from a position corresponding to the portion where the branch pipe of the barrel pipe is mounted to a position opposite to the corresponding position along the circumference of the barrel pipe. According to the above, the tubular container is characterized in that the groove is gradually increased in depth and a grooved portion capable of absorbing a deformation amount caused by welding is formed.