JPH10238696A - Aluminum alloy high pressure container, and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the mechanical and contact-corrosive damage of a threaded part, and to provide the sealability to withstand the high pressure at the threaded part. SOLUTION: A neck member 3 is welded to an end plate member of an aluminum alloy high pressure container. A stainless steel intermediate member 5 provided with a flange (b) is provided on one end of a cylinder (a), the cylinder (a) is fitted to a through hole in the neck member 3, and the flange (b) is welded to the outer end of the neck member 3 by the friction welding. A female screw is formed on the inner circumference of the intermediate member 5, and a brass valve 4 is screwed therein. Because the valve 4 is not screwed into the neck member 3, the female screw is not broken, or the aluminum alloy is not brought into contact with brass, and the contact corrosion can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure container made of an aluminum alloy filled with a high-pressure gas and a high-pressure liquid and a method of manufacturing the same.

[0002]

2. Description of the Related Art As an example of a high-pressure vessel made of an aluminum alloy to be filled with a high-pressure gas and a high-pressure liquid, many examples shown in FIG. 5 are commercially available. 5083-O (annealed material) is used as the material. The body member 1 is manufactured by winding a rectangular plate material into a cylinder, joining both ends together by arc welding. Then, the curved end plate members 2 are joined to both sides of the body member 1 by arc welding. At the center of one end plate member 2, a neck member 3 internally threaded is attached by arc welding. The female screw of the neck member 3 is attached by screwing a valve 4 having an external thread cut on the outer periphery. Some of them have no welding seam. (Patent No. 2525717)

[0003] A pressure test and an airtight test are performed on a high-pressure container. These tests are performed after a connection portion of a test machine is screwed into a neck member 3. However, the female screw of the neck member 3 was easily damaged by the tightening torque when the connecting portion was screwed. Further, the valve 4 was easily damaged by a tightening torque at the time of screwing. The material of the neck member 3 is an aluminum alloy, and the material of the valve 4 is mainly brass C3771B. Contact corrosion (electrolytic corrosion) at contact points between aluminum alloy and brass
Progresses gradually, so that the damage of both screwed portions also progresses. Therefore, in order to prevent contact corrosion, the male screw portion of the valve 4 is plated with nickel or tin. However, such measures did not sufficiently prevent damage.

[0004]

The inventor of the present invention has no good measure to eliminate mechanical damage due to the tightening torque at the screwing portion of the valve 4 into the neck member 3 and corrosive damage due to contact corrosion at once. I thought it was something. As a result of study, it was found that the aluminum alloy of the neck member 3 and the brass of the valve 4 should not be in direct contact. Then, it was wondered if a stainless steel intermediate member was provided between them. However, when a stainless steel intermediate member is used, a new problem arises in that it is difficult to ensure a sealing property that can withstand high pressure at a contact portion between the aluminum alloy and the stainless steel. The problem to be solved by the present invention is to provide a high-pressure container which prevents mechanical and contact corrosion damage of a screwed portion, and has a sealing property to withstand a high pressure in the screwed portion, and a method of manufacturing the same. .

[0005]

In the aluminum alloy high-pressure container according to claim 1 and the aluminum alloy high-pressure container manufactured by the manufacturing method according to claim 4, the flange of the neck member 3 and the intermediate member 5 are provided. b is joined by friction welding. Therefore, the seal between the neck member 3 and the intermediate member 5 is perfect. In the case of the second and third aspects and the one produced by the production method of the fifth, sixth and seventh aspects, the intermediate member 5 is screwed into the neck member 3 using a sealing material between the two. Therefore, there is no problem in the sealing property between the two. According to the manufacturing method of the eighth aspect, the adhesion between the two is further improved, and the sealing property is further improved.

According to the first to third aspects and the one produced by the production method according to the fourth to eighth aspects,
An intermediate member 5 made of strong stainless steel is provided inside the neck member 3. Since the connection portion of the valve 4 and the testing machine is screwed into the intermediate member 5 instead of the neck member 3, the female screw of the neck member 3 is not damaged. Further, since the brass valve 4 is in contact with the stainless steel intermediate member 5 and is not in contact with the aluminum alloy neck member 3,
There is no danger of contact corrosion.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The inventor of the present invention has proposed that a neck member 3 is provided.
As a result of various studies as to whether there is a good solution that can simultaneously eliminate the mechanical damage due to the tightening torque generated in the female screw portion and the damage due to contact corrosion, and also ensure the sealing performance that can withstand high pressure, the present invention was I was able to complete it. An embodiment of the present invention will be described in detail.
In order to simultaneously eliminate the mechanical damage due to the tightening torque and the damage due to the contact corrosion generated in the mounting screw portion of the neck member 3, the stainless steel neck member 3 and the brass valve 4 are provided between the neck member 3 and the brass valve 4. The intermediate member 5 may be used. In this case, complete sealing between the neck member 3 and the intermediate member 5 must be ensured. The following measures are conceivable to ensure the sealing performance. The neck member 3 made of aluminum alloy and the intermediate member 5 made of stainless steel are joined all around by welding to complete the seal between them. The aluminum alloy neck member 3 and the stainless steel intermediate member 5 are joined by a screw mechanism. At this time, sealing properties are ensured using a sealing material such as a paste-like or tape-like packing.

In the aluminum alloy high-pressure vessel according to the present invention and the aluminum alloy high-pressure vessel manufactured by the manufacturing method according to the present invention, the stainless steel stainless steel having the following shape and structure for attaching the valve 4 to the neck member 3 is used. Is provided between them. For example, as shown in FIG. That is, the through hole of the cylindrical aluminum alloy neck member 3 is aligned with the hole formed in the center of the end plate member 2,
The neck member 3 is attached to the outer surface of the end plate member 2 by welding. Then, a stainless steel intermediate member 5 provided with a flange b at one end of a cylinder a that fits into the through hole of the neck member 3 is prepared, the cylinder a is fitted into the through hole of the neck member 3, and the flange b is attached to the neck member 3. To the outer end of the body by friction welding. A tapered through hole is made in the center of the intermediate member 5, a female screw is cut into the through hole, and a brass valve 4 having an external thread cut on the outer periphery that can be screwed into the female screw is screwed into the intermediate member 5. I have.

At first, the method of directly joining the 5083-O material to the end plate member 2 was studied by making the neck member 3 made of stainless steel. First, we tried joining by arc welding. However, the aluminum alloy and stainless steel could not be joined due to weld cracking. Then, the joining by the friction welding method was tried. However, the aluminum alloy 5083-O material and the stainless steel were only partially joined, and complete circumferential joining was not obtained. While studying why it did not work, we thought that the cause might be the amount of magnesium (about 4.5%) in the aluminum alloy. Aluminum alloy containing no magnesium (No. 1000, No. 3000, No. 4000)
No.) and aluminum alloys with low magnesium content (20
00 number ・ 5005 ・ 5052 ・ 5652 ・ 5454 ・ 6
No. 000/7000) and friction welding with stainless steel. For all of these, a circumferential bond was obtained. Therefore, it is sufficient to employ these aluminum alloys as the material of the end plate member 2 and directly perform friction welding with the neck member 3 made of stainless steel. However, 1000, 3000, 4000, 5005
* The 5052/5652/5454 alloy is inferior in strength. In the case of alloys 2000, 6000, and 7000, the strength of the heat-affected zone due to welding decreases. End plate member 2
Must be increased, resulting in an uneconomical design. Therefore, as the material of the neck member 3, an aluminum alloy containing no magnesium or an aluminum alloy containing magnesium and containing 3% or less is used. This is one of the requirements for specifying the present invention. Then, the structure shown in FIG.
Is interposed between the neck member 3 and the valve 4. The joining of the head plate member 2 and the neck member 3 is performed by arc welding, and no problem occurs.

In FIG. 1, the neck member 3
The outer periphery of the cylindrical body a of the intermediate member 5 may be tapered. If a taper is provided, either a taper that expands outward or a taper that expands inward may be used. Alternatively, the inner periphery of the neck member 3 and the outer periphery of the cylindrical body a of the intermediate member 5 may be brought into close contact with each other and welded to further complete the seal therebetween.

Alternatively, as shown in FIG. That is, the through hole of the neck member 3 is tapered, and a female screw is formed on the inner periphery. The outer shape of the stainless steel intermediate member 5 matches the inner surface shape of the neck member 3, and a male screw that can be screwed into the female screw of the neck member 3 is cut to the outer periphery. A sealing material is interposed between the two, and the neck member 3
The intermediate member 5 is screwed inside. Then, the valve 4 is screwed into the intermediate member 5. In some cases, the valve 4 may be removed for the purpose of re-inspection of the container. At this time, it is necessary to prevent the intermediate member 5 from rotating even if the valve 4 is rotated. For that purpose, it is essential that the intermediate member 5 be mounted in the neck member 3 with a torque larger than the mounting torque of the valve 4. In this case, the material of the neck member 3 does not necessarily need to be an aluminum alloy. Further, the taper provided in the through hole of the neck member 3 may be provided in the opposite direction. It is not always necessary to attach a taper.

Alternatively, as shown in FIG. The intermediate member 5 made of stainless steel has a coil shape. The outer and inner periphery of the intermediate member 5 is a neck member 3 made of aluminum alloy.
And the external thread of the valve 4.
Alternatively, only the outer periphery of the intermediate member 5 is formed in a shape along the female screw of the neck member 3. At this time, the processing direction of the female screw of the neck member 3 and the winding direction of the coil of the intermediate member 5 need to be matched. Also, the coil member is formed so as to have a coil diameter slightly larger than the inner diameter of the neck member 3. Then, the intermediate member 5 is screwed into the neck member 3 while giving a rotation in the same direction as the winding of the coil by using a sealing material. When the rotation in the same direction as the winding of the coil is given, the winding diameter of the coil is reduced and the intermediate member 5 can be inserted smoothly. When the rotation is stopped, the coil diameter increases due to the springback, and the intermediate member 5 adheres well. Conversely, when the rotation is given in the opposite direction to the winding of the coil, the winding diameter of the coil becomes large. After all, it is impossible to provide reverse rotation. When taking out the intermediate member 5,
It can also be impossible.

Further, a male screw member having an outer peripheral shape which can be just screwed into the female screw shape on the inner periphery of the intermediate member 5 is prepared, and after the intermediate member 5 is screwed into the neck member 3, the male member is wound in the same direction as the winding of the coil. The male screw member may be screwed into the intermediate member 5 and tightened while rotating. The adhesion between the neck member 3 and the intermediate member 5 is further strengthened. Note that the inner periphery of the intermediate member 5 is not formed in a female screw shape,
After screwing the intermediate member 5 into the neck member 3, the valve 4
A female screw that engages with the male screw may be post-processed with a tap or the like. Even when the inner periphery of the intermediate member 5 is formed into a female screw shape, post-processing may be performed after the intermediate member 5 is screwed in to increase the screw accuracy.

An external thread corresponding to the female thread shape on the inner periphery of the intermediate member 5 is cut on the outer periphery of the valve 4, and the valve 4 is screwed into the intermediate member 5. Therefore, the outer periphery and the inner periphery of the intermediate member 5 are shaped along both the female screw of the neck member 3 and the male screw of the valve 4 or only the outer periphery of the intermediate member 5 is shaped along the female screw of the neck member 3. The intermediate member 5 is formed so as to have a slightly larger coil diameter, and the winding direction of the coil of the intermediate member 5 is made to coincide with the threading direction of the neck member 3, and the intermediate member 5 is rotated while being rotated in the same direction as the winding of the coil. The screwing of the member 5 is an important matter that specifies the present invention. In this case, the material of the neck member 3 does not necessarily need to be an aluminum alloy.

The neck member 3 and the intermediate member 5 are manufactured as follows. In the case of a container having no welding seam, the neck member 3 may be integrally formed with the body member 1 and the end plate member 2 by forging or the like. The material of the container without welding seam is 606
1-T6 and the like. In the case of the embodiment shown in FIG. 1, the heat-affected zone is softened by friction welding. However, since the thickness of the neck member 3 can be sufficiently ensured, there is no problem in strength.
In the case of a welding type container, the neck member 3 may be formed as a single item by cold forging, machining, or the like. And it may join with the end plate member 2 by arc welding. The material of the head plate member 2 of the welding type container is 5083-O or the like, and the heat affected zone is not softened by welding. For the neck member 3,
Even if a material whose heat-affected zone is softened is selected, there is no problem in strength because a sufficient thickness is secured.

The intermediate member 5 may be formed by cold forging or machining. The neck member 3 and the intermediate member 5
May be machined with a dice tap. When the intermediate member 5 is formed into a coil shape, the intermediate member 5 is formed into a cross-sectional shape along both the female screw of the neck member 3 and the male screw of the valve 4 or a cross-sectional shape along only the female screw of the neck member 3. Then, the side along the female screw of the neck member 3 is set to the outside, the coil diameter is slightly larger than the inner diameter of the neck member 3, and the coil is wound in the same direction as the female screw of the neck member 3.

In the case of the one shown in FIG. 2, instead of the neck member 3 and the intermediate member 5 being joined by screwing, the outside is made of an aluminum alloy neck member 3 and the inside is made of a stainless steel intermediate member 2. You may change to a heavy pipe. This double pipe is formed, for example, by inserting a stainless steel pipe (or pipe) into the inner periphery of an aluminum alloy pipe (or pipe), and then using a die or the like to achieve a large area reduction rate (drawing with respect to the cross-sectional area before drawing). (The ratio of the later cross-sectional area) and drawing. Alternatively, the outer peripheral surface of the stainless steel and the inner peripheral surface of the aluminum alloy may be solid-phase bonded by explosion.

[0018]

Embodiment 1 Embodiment 1 will be described with reference to FIG. The first embodiment is a high-pressure liquefied petroleum gas container. The type of container is compatible with LP5 (allowable maximum filling amount of 5 kg) to LP20 (allowable maximum filling amount of 20 kg). The through hole of the cylindrical neck member 3 was aligned with the hole formed in the center of the end plate member 2, and the neck member 3 was attached to the outer surface of the end plate member 2 by arc welding. Then, an intermediate member 5 provided with a flange b corresponding to the size of the neck member 3 at one end of the cylindrical body a that fits into the through hole of the neck member 3 is prepared, and the cylindrical body a is fitted into the through hole of the neck member 3. Flange b to neck member 3
Was joined by friction welding to the outer end. The intermediate member 5
The inner peripheral surface of was slightly tapered, and an internal thread was cut on the inner periphery. The valve 4 was cut into the intermediate member 5 by cutting a male screw which could be screwed into the female screw on the outer periphery.

The material of the end plate member 2 is aluminum alloy 50
83-O material, neck member 3 is aluminum alloy 5052
-O material, valve 4 was brass, and intermediate member 5 was austenitic stainless steel SUS304. The neck member 3 and the intermediate member 5 were each formed by cold forging. The thread cutting of the intermediate member 5 was performed by machining. The dimensions of each part of each member were determined by applying “JIS B 8233 Annex 1 Symbol N2 of Valve Mounting Part”. The position of the reference diameter of the valve mounting portion was the outer end face of the intermediate member 5, and the reference diameter was 28.000 mm as the diameter of the valley. The female screw portion of the intermediate member 5 is provided with a 3/26 taper, and the effective screw length is 25.
mm. The outer diameter of the flange b of the intermediate member 5 is 60 m
m and the outer diameter of the cylindrical body a were 45 mm. The outer diameter of the neck member 3 was 60 mm and the inner diameter was 47 mm.

When attaching the valve 4 to the intermediate member 5, 3
It was tightened with a torque of 50 Nm. (The specified torque is 20
0 to 300 N · m. Then, the threaded portion of the valve 4 was examined for pressure resistance up to 7 MPa. The airtightness was good. The valve 4 was removed and the threaded portion of the intermediate member 5 was examined. No abnormality was found in the screw portion.

Embodiment 2 Embodiment 2 will be described with reference to FIG. The material of the neck member 3 was an aluminum alloy 5083-O material. The through hole of the neck member 3 was tapered at 3/26, and the inner surface was machined with an internal thread. The outer shape of the intermediate member 5 was made to match the inner shape of the neck member 3, and the outer periphery was externally threaded. The through hole of the intermediate member 5 was also tapered, and a female screw was cut. An external thread that can be screwed into the intermediate member 5 was cut on the outer periphery of the valve 4. A paste-like sealing material was applied to the outer periphery of the intermediate member 5 and then screwed into the neck member 3 by applying a torque of 450 N · m. A nut was provided at the upper end of the intermediate member 5, and the nut was used for screwing. Then, the valve 4 was screwed into the intermediate member 5 by applying a torque of 350 Nm. Others were the same as in Example 1. A reverse torque was applied to the valve 4. The valve 4 rotated, but the intermediate member 5 did not move. No abnormality was found in the threaded portion of the intermediate member 5. The pressure resistance of the mounting portion of the valve 4 up to 7 MPa was examined, and the airtightness was good.

Embodiment 3 Embodiment 3 will be described with reference to FIGS. The stainless steel intermediate member 5 was coil-shaped, and the cross-sectional shape was an abacus ball shape as shown in FIG. The inner surface of the neck member 3 made of an aluminum alloy was internally threaded according to the outer peripheral shape of the intermediate member 5, but the coil diameter of the intermediate member 5 was made slightly larger than the inner diameter of the neck member 3. An external thread corresponding to the inner peripheral shape of the intermediate member 5 was cut on the outer surface of the valve 4. The processing direction of the female screw of the neck member 3 and the male screw of the valve 4 was made to coincide with the direction of coil winding of the intermediate member 5. The female screw of the neck member 3 and the male screw of the valve 4 were both right-handed threads with a taper of 3/26. The outer diameter of the neck member 3 was 60 mm, the position of the reference diameter of the female screw on the inner periphery was the outer end, and the reference diameter was 30.92 mm as the diameter of the valley. The screws were machined.

The intermediate member 5 has a sectional shape shown in FIG. The unit of the dimension is millimeter. After drawing stainless steel SUS304 with a die, it was wound around a right-handed coil so that the maximum outer diameter was about 35 mm. The intermediate member 5 was screwed into the neck member 3 by applying rotation in the same direction as the direction of coil winding while using a paste-like sealing material to ensure sealing properties. When the rotation in the same direction as the coil winding is given, the winding diameter of the coil is reduced, and the intermediate member 5 can be inserted smoothly. When the insertion is completed, the coil diameter of the intermediate member 5 is increased by springback, so that the adhesion is improved. In addition, in the case where insertion is performed by giving a rotation in the opposite direction to the coil winding, since the winding diameter of the coil becomes large, it becomes impossible to give the rotation. The removal of the intermediate member 5 also becomes impossible.

Then, a male screw member having a male screw shape formed on the outer periphery corresponding to the male screw shape of the valve 4 is separately prepared, and the male screw member is screwed into the intermediate member 5 while applying a torque of 450 N · m to form the neck member 3. And the intermediate member 5 are further improved in adhesion. Others are the same as the second embodiment. Screw the valve 4 into the intermediate member 5 and
It was tightened with a torque of 0 Nm. 7MP for mounting part
The pressure resistance up to a was examined. The airtightness was good. The valve 4 was removed, and the screw portion was examined. No abnormalities were found.

[0025]

In the aluminum alloy high-pressure vessel according to the present invention and the aluminum alloy high-pressure vessel manufactured by the manufacturing method according to the present invention, there is little contact corrosion and there is no damage to the screw portion due to tightening torque. The sealing property is good even under high pressure. The neck member 3 and the intermediate member 5 have a simple structure, and can be formed by cold forging, wire drawing with a die, or the like. This allows for highly efficient production,
Production costs are also reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a first embodiment.

FIG. 2 is a partial sectional front view showing a second embodiment.

FIG. 3 is a sectional view showing a third embodiment.

FIG. 4 is a sectional view showing a main part of a third embodiment.

FIG. 5 is a partial sectional view showing a conventional example.

[Explanation of symbols]

 3 Neck member 4 Valve 5 Intermediate member

Claims (8)

[Claims] A neck member (3) having a through hole made of an aluminum alloy containing no magnesium or an aluminum alloy containing 3% or less of magnesium in a hole drilled at one end of a high-pressure vessel made of an aluminum alloy. The neck member (3) is joined to the high-pressure container with the through holes aligned, and a cylinder (a) formed on one end side of the stainless steel intermediate member (5) is inserted into the neck member (3). The flange (b) formed on the other end is fitted to the outer end of the neck member (3) by friction welding, and the intermediate member (5) is provided with a female threaded tapered through hole. An aluminum alloy high-pressure container in which a brass valve (4) whose outer thread is cut into the outer thread and can be screwed into the female thread is screwed into a through hole of the intermediate member (5). 2. A neck member (3) attached to a high-pressure container in a state in which a through-hole of a neck member (3) having a female screw-threaded through-hole is aligned with a hole formed at one end of a high-pressure container made of an aluminum alloy. And a stainless steel intermediate member (5) provided with a male thread cut on the outer periphery, which can be just screwed into a through hole of the neck member (3), and a female threaded tapered through hole. Is a brass valve which is screwed into the through-hole of the neck member (3) using a sealing material between the two and has an outer thread cut on the outer periphery which can be screwed into the female screw of the intermediate member (5) ( 4) An aluminum alloy high-pressure vessel screwed into the through hole of the intermediate member (5) with a torque smaller than the mounting torque of the intermediate member (5) to the neck member (3). 3. A neck member (3) having a through hole formed at one end of an aluminum alloy high-pressure vessel and a threaded female threaded neck member (3) having a through hole with a female thread. The coiled stainless steel intermediate member (5) to which (3) is joined and has an outer periphery in an external thread shape and an inner thread shape that can be screwed into an internal thread of the neck member (3). ) Is screwed into the internal thread of the neck member (3) using a sealing material between the two, and a yellow external thread cut on the outer periphery that can be screwed into the internal thread shape of the intermediate member (5). An aluminum alloy high pressure vessel in which a copper valve (4) is screwed into the intermediate member (5). 4. A neck member (3) having a through hole made of an aluminum alloy containing no magnesium or an aluminum alloy containing 3% or less of magnesium by making a hole in one end of a high-pressure vessel made of an aluminum alloy. The neck member (3) is joined to one end of the high-pressure vessel by welding with the through-hole of the member (3) aligned with the hole of the high-pressure vessel, and one end side fits into the through-hole of the neck member (3). The other end of the body (a) is a flange (b)
The intermediate member (5) is made of stainless steel, a tapered through hole is provided at the center of the intermediate member (5), and a female screw is formed in the through hole. ) Is inserted into the through hole of the neck member (3), the flange (b) is joined to the outer end of the neck member (3) by friction welding, and an external thread that can be screwed into the internal thread of the intermediate member (5) is provided on the outer periphery. A method of manufacturing a high pressure vessel made of aluminum alloy, comprising preparing a brass valve (4) cut into pieces, and screwing the valve (4) into a through hole of the intermediate member (5). 5. A high pressure vessel made of an aluminum alloy is provided with a hole at one end thereof, and a neck member (3) having a female threaded through hole is produced, and a through hole of the neck member (3) and a hole of the high pressure vessel are formed. And the neck member (3) is joined to one end of the high-pressure vessel, and a male screw that can be screwed into the through hole of the neck member (3) is cut on the outer periphery, and the tapered through hole is located at the center. An intermediate member (5) with a female thread cut in the through hole is made of stainless steel,
A brass valve in which an intermediate member (5) is screwed into the through hole of the neck member (3) using a sealing material between the two members, and an external thread which can be just screwed into the female screw of the intermediate member (5) is cut on the outer periphery. (4) is manufactured, and the valve (4) is screwed into the through hole of the intermediate member (5) with a torque smaller than the mounting torque of the intermediate member (5) to the neck member (3). Production method. 6. A high pressure vessel made of an aluminum alloy is provided with a hole at one end, and a neck member (3) having a female threaded tapered through hole is produced, and the through hole of the neck member (3) and the high pressure vessel are manufactured. The neck member (3) is joined to one end of the high-pressure vessel in a state where the holes are aligned with each other, and the outer periphery is formed in a male screw shape which can be screwed into the female screw of the through hole of the neck member (3). Although the coil-shaped intermediate member (5) formed into a female screw shape is made of stainless steel, the coil is formed so as to have a coil diameter slightly larger than the inner diameter of the neck member (3). And the threading direction of the neck member (3) are made to coincide with each other, and the intermediate member (5) is inserted while rotating in the same direction as the winding of the coil using a sealing material between the two. Neck member (3 )), An intermediate member (5) is screwed into the through hole, and a brass valve (4) in which an external thread which can be screwed into the internal thread shape of the intermediate member (5) is cut to the outer periphery is manufactured. A method of manufacturing an aluminum alloy high-pressure vessel screwed into a member (5). 7. A high-pressure container made of an aluminum alloy is provided with a hole at one end, and a neck member (3) having a female threaded tapered through-hole is manufactured, and the through-hole of the neck member (3) and the high-pressure container are manufactured. A neck member (3) is joined to one end of the high-pressure container in a state where the holes are aligned with each other, and the outer periphery is formed in a male screw shape that can be screwed into the female screw of the through hole of the neck member (3). The member (5) is made of stainless steel, but is formed so as to have a coil diameter slightly larger than the inner diameter of the neck member (3), and the winding direction of the coil of the intermediate member (5) and the neck member (3). The intermediate member (5) is inserted while matching the screw processing direction of the intermediate member (5) and applying rotation in the same direction as the winding of the coil by using a sealing material between the two to insert the intermediate member (5).
An intermediate member (5) is screwed into the through hole of the above, and a valve (4) made of brass having an externally threaded outer periphery is manufactured, so that the inner periphery of the intermediate member (5) can be screwed into the valve (4). And a valve (4) is screwed into the intermediate member (5). 8. An externally threaded member which is screwed into an internal thread of an intermediate member (5) by screwing the intermediate member (5) into a through hole of the neck member (3). Is separately manufactured, and screwed into the female screw shape of the intermediate member (5) while applying rotation in the same direction as the winding of the coil of the intermediate member (5) to the male screw member, thereby tightening the neck member (3) and the intermediate member (5). The method for manufacturing a high-pressure container made of an aluminum alloy according to claim 6, wherein the adhesiveness of the aluminum alloy is further enhanced.