JP2005321093A - Manufacturing method of liner for pressure container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a liner for a pressure container capable of preventing joint strength of like-minded joint parts of liner component members and productivity from declining. <P>SOLUTION: The liner for the pressure container 1 composed of a tubular shell 2 and an end plate 3 to close both end openings of the shell comprises a first liner component member 4 having a tubular circumferential wall part 6 constituting the shell 2, while both ends are open and the two second liner component members 5 having a dome-like circumferential wall member 7 constituting the end plate 3. Like-minded circumferential wall parts 6, 7 of both liner component members 4, 5 are abutted, and on the abutted portion, a probe 22 of a tool for friction agitating junction 20 is buried as if straddling the two parts. Then, both liner members 4, 5 and the probe 22 are relatively moved while rotating the probe 22. When number of revolutions of the probe is Rrpm, and junction rate of both liner component members 4, 5 is Vmm/min, R/V fulfills the conditions of the following formula: 2≤R/V≤12. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  For example, in the automobile industry, the housing industry, the military industry, the aerospace industry, the medical industry, etc., the present invention is applied to a pressure vessel that stores hydrogen gas or natural gas that is a fuel for power generation, or a pressure vessel that stores oxygen gas. The present invention relates to a pressure vessel liner used and a manufacturing method thereof.

  In this specification, the term “aluminum” includes aluminum alloys in addition to pure aluminum.

In recent years, natural gas vehicles with clean exhaust gas and fuel cell vehicles have been developed as measures against air pollution. These automobiles are equipped with a pressure vessel filled with natural gas or hydrogen gas as a fuel at a high pressure. However, in order to extend the cruising range, further increase in the pressure of the gas to be filled is required.
Conventionally, as such a liner for a high-pressure vessel, a cylindrical body and an end plate that closes both ends of the body are formed, and both ends are open and made of an aluminum extruded shape member having a cylindrical peripheral wall portion that constitutes the body. What is formed by one liner constituting member and two aluminum die cast second liner constituting members having a dome-shaped peripheral wall portion constituting the end plate and melt welded to both ends of the first liner constituting member is known. (For example, see Patent Document 1).

  This liner for a pressure vessel includes a helical wound reinforcing layer formed by impregnating and curing an epoxy resin on a helical wound fiber layer formed by winding reinforcing fibers on both end plates in the longitudinal direction of the barrel, and reinforcing fibers on the barrel. A hoop wound fiber layer formed by impregnating and curing an epoxy resin on a hoop wound fiber layer wound around in the circumferential direction is provided and used as a high pressure container.

  According to the liner for a pressure vessel described in Patent Document 1, since the first liner constituent member and the second liner constituent member are melt welded, the strength of the welded portion is insufficient, and a large force acts in the length direction. In this case, there is a possibility that stress concentrates on the welded portion of both liner constituent members and breaks at this portion. In order to prevent such breakage, it is necessary to increase the thickness of the helical winding reinforcing layer in the high pressure vessel, and as a result, there is a problem that the weight of the high pressure vessel increases. Further, when forming the helically wound fiber layer, slipping, catching, fiber breakage, etc. may occur, and the required pressure resistance may not be obtained.

  As a liner for a high-pressure pressure vessel in which the strength of the joint portion between both liner components is increased, the cylindrical peripheral wall portion is formed of a cylindrical body and an end plate closing both ends of the body, and both ends are open and constitute the body. First aluminum liner constituting member, two aluminum second liner constituting members having a dome-shaped peripheral wall portion constituting the end plate and joined to both ends of the first liner constituting member, and a first liner constitution A wagon wheel-like support structure member disposed so as to straddle the inner wall of the contact portion between the peripheral wall portion of the member and the peripheral wall portion of the second liner component member, the first liner component member, the second liner component member, and the second liner component member; One in which a liner constituent member and a support structure member are friction stir welded is known (see Patent Document 2).

  According to the pressure vessel liner described in Patent Document 2, since the first liner component member and the second liner component member are friction stir welded, the liner component members are compared to the pressure vessel liner described in Patent Document 1. The strength of the joint is increased.

However, Patent Document 2 does not describe the optimum conditions for friction stir welding of liner constituent members when manufacturing a liner for a pressure vessel. In some cases, the productivity may decrease or the probe may be damaged.
Japanese Patent Laid-Open No. 9-42595 Japanese Patent Laid-Open No. 10-160097

  An object of the present invention is to provide a pressure vessel liner manufacturing method capable of solving the above-described problems and preventing a decrease in bonding strength and productivity in a bonding portion between liner constituent members.

  In the present invention, as a result of various investigations by the inventors, the relationship between the rotational speed of the probe and the joining speed during friction stir welding is the relationship between the joint parts of both liner components in the manufactured pressure vessel liner. The present invention has been completed by finding out that it greatly affects the improvement of quality, and comprises the following aspects.

  1) Manufactured by joining at least two liner components that are shaped like a cylinder that is divided into the length of the cylinder. The two liner constituent members adjacent to each other are brought into contact with each other, and the probe of the friction stir welding tool is embedded in this contact portion so as to straddle both, and then both liners are rotated while the probes are rotated. In a method including moving the probe and the probe relative to each other over the entire circumference of the abutting portion and friction stir welding the two liner constituent members, the rotational speed of the probe is Rrpm, both liners A method for manufacturing a liner for a pressure vessel, wherein R / V satisfies a condition of 2 ≦ R / V ≦ 12 when the joining speed of the constituent members is Vmm / min.

  In the above method 1), if R / V is less than 2, the strength of the joint of the pressure vessel liner produced due to defects in the joint due to insufficient heat input becomes insufficient, and the probe If it is damaged or the life of the probe is shortened and the value is larger than 12, the amount of heat input becomes excessive, and the surface of the pressure vessel liner to be manufactured becomes rough or surface defects appear. Therefore, the R / V should be selected within the range of 2-12.

  2) The method for producing a pressure vessel liner as described in 1) above, wherein the R / V satisfies a condition of 2 ≦ R / V ≦ 8.

  3) The method for producing a liner for a pressure vessel according to the above 1) or 2), wherein the thickness of the contact portion of both liner constituting members is 0.5 to 20 mm.

  In the above method 3), if the thickness is less than 0.5 mm, the liner constituting member may be deformed when the probe is embedded and the material may be turned up during joining. The configuration of the jig for fixing the member and the entire apparatus becomes complicated. On the other hand, if it exceeds 20 mm, it is necessary to increase the probe length and the probe diameter, and it is necessary to increase the size of the apparatus so that it can withstand the load caused by the probe during joining. Therefore, in any case, the apparatus cost becomes high.

  4) The method for producing a liner for a pressure vessel according to any one of 1) to 3) above, wherein the contact portions of both liner constituent members are friction stir welded 360 degrees or more in the circumferential direction.

  5) The method for producing a liner for a pressure vessel according to any one of 1) to 4) above, wherein all liner constituting members are made of aluminum.

  6) A first liner constituent member having a cylindrical peripheral wall portion that is open at both ends and constituting the body, and two second liner constituent members having a dome-shaped peripheral wall portion constituting the end plate are prepared. 6. The method for producing a pressure vessel liner according to any one of the above 1) to 5), wherein the peripheral wall portion of the liner constituting member and the peripheral wall portion of the second liner constituting member are friction stir welded.

  7) The method for producing a pressure vessel liner according to 6) above, wherein the first liner constituting member is extruded using aluminum, and the second liner constituting member is formed by forging using aluminum.

  8) A pressure vessel liner produced by the method according to any one of 1) to 7) above.

  9) A pressure vessel in which the outer peripheral surface of the pressure vessel liner described in 8) is covered with a fiber reinforced resin layer.

  10) A fiber-reinforced resin layer is formed of a helically wound fiber layer formed by winding reinforcing fibers on both end plates in the lengthwise direction of the cylinder, a hoop-wrapped fiber layer formed by winding reinforcing fibers around the cylinder, and these 9. The pressure vessel according to 9) above, comprising a resin impregnated in a fiber layer and cured.

  11) A fuel hydrogen pressure vessel, a fuel cell, and a pressure pipe for sending fuel hydrogen gas from the fuel hydrogen pressure vessel to the fuel cell. The fuel hydrogen pressure vessel is from the pressure vessel described in 9) or 10) above. A fuel cell system.

  12) A fuel cell vehicle equipped with the fuel cell system according to 11) above.

  13) A cogeneration system comprising the fuel cell system according to 11) above.

  14) A natural gas supply system comprising a natural gas pressure vessel and a pressure pipe for sending natural gas from the natural gas pressure vessel, wherein the natural gas pressure vessel comprises the pressure vessel described in 9) or 10) above.

  15) A cogeneration system comprising the natural gas supply system described in 14) above, a generator, and a generator drive device.

  16) A natural gas vehicle comprising the natural gas supply system described in 14) above and an engine using natural gas as fuel.

  17) An oxygen gas supply system comprising an oxygen pressure vessel and a pressure pipe for sending oxygen gas from the oxygen pressure vessel, wherein the oxygen pressure vessel comprises the pressure vessel described in 9) or 10) above.

  According to the pressure vessel liner manufacturing method of 1) above, when the rotational speed of the probe is R rpm and the joining speed of both liner constituent members is V mm / min, R / V is 2 ≦ R / V ≦ 12. Since the conditions are satisfied, there is no excess or deficiency in the amount of heat input, the occurrence of internal defects in the joints between the liner constituent members is prevented, and the strength reduction of the joints is prevented. Therefore, the pressure resistance in the longitudinal direction of the barrel at the joint portion of the pressure vessel liner to be manufactured is sufficient. Further, it becomes possible to prevent damage to the probe and shorten the life of the probe, thereby improving productivity. In addition, it is possible to prevent the surface of the pressure vessel liner to be produced from being rough and from causing surface defects.

  According to the method for producing a pressure vessel liner of 2), the effect of the method of 1) becomes more remarkable.

  According to the pressure vessel liner manufacturing method of 3) above, it is possible to prevent the liner constituent member from being deformed when the probe is embedded, and to complicate the jig for fixing the liner constituent member and the overall configuration of the apparatus. This eliminates the need for the probe and the load on the probe during bonding becomes relatively small, eliminating the need to increase the size of the apparatus. Therefore, the device cost is reduced.

  According to the pressure vessel liner manufacturing method of 4) above, the pressure resistance and airtightness of the joint are further improved.

  According to the method for manufacturing a pressure vessel liner of the above 5), the pressure vessel liner to be manufactured can be reduced in weight.

  According to the pressure vessel liner manufacturing method of 6) above, the length of the first liner component can be arbitrarily determined, so that the length of the pressure vessel liner to be manufactured is set to the required internal volume. It can be changed as appropriate. When the liner constituent member has a peripheral wall portion in which the cylindrical portion and the dome-like portion are integrated, that is, when the liner constituent member has at least a part of the trunk and a end plate that closes one end opening of the trunk, forging However, the manufacturing operation becomes extremely difficult to increase the length of the cylinder.

  According to the pressure vessel liner manufacturing method of the above 7), the first liner constituent member and the second liner constituent member can be manufactured relatively easily.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows the overall structure of a pressure vessel liner produced by the production method of the present invention, and FIG. 2 shows a high-pressure hydrogen gas vessel using the pressure vessel liner of FIG. 3 and 4 show a method for manufacturing a pressure vessel liner.

  In FIG. 1, a pressure vessel liner (1) is composed of a cylindrical body (2) and an end plate (3) that closes both ends of the body (2). A first liner constituting member (4) constituting 2), and two aluminum second liner constituting members (5) which are joined to both end portions of the first liner constituting member (4) to constitute an end plate (3); It is formed by. Each second liner constituent member (5) is formed by forging or cutting.

  The first liner constituting member (4) has a peripheral wall portion (6) having a circular cross section constituting the body (2). Each second liner constituting member (5) has a dome-shaped peripheral wall portion (7) having an open end that constitutes the end plate (3). The opening side end of the peripheral wall (7) is circular. A base attachment portion (8) is formed integrally with the second liner constituting member (5). A through hole (8a) is formed from the outer end of the base mounting portion (8), and a female screw (9) is formed on the inner peripheral surface of the through hole (8a).

  The first liner constituent member (4) and the second liner constituent member (5) are each formed of, for example, any one of JIS A2000 alloy, JIS A5000 alloy, JIS A6000 alloy, and JIS A7000 alloy. Yes. These liner constituent members (4) and (5) may be made of the same material, or at least two of the three may be made of different materials.

  Both end portions of the peripheral wall portion (6) of the first liner constituent member (4) and the opening end portion of the peripheral wall portion (7) of each second liner constituent member (5) are in contact with each other. The liner constituting member is friction stir welded over the entire circumference at the contact portion between them. The joint bead is indicated by (10).

  As shown in FIG. 2, the entire pressure vessel liner (1) is covered with a fiber reinforced resin layer (12) made of, for example, carbon fiber reinforced resin, and used as a high pressure vessel (11). Similar to the pressure vessel liner described in Patent Document 1, the fiber reinforced resin layer (12) is a helical winding reinforcement in which reinforcing fibers are wound around both end plates (3) and wound in the longitudinal direction of the body (2). A layer, a hoop wound reinforcing layer in which reinforcing fibers are wound around the body (2) in the circumferential direction, and a resin impregnated and cured in these reinforcing layers. As the resin, a thermosetting resin or a photocurable resin is used.

  The high-pressure pressure vessel is used as a fuel hydrogen pressure vessel in a fuel cell system including a fuel hydrogen pressure vessel, a fuel cell, and a pressure pipe for sending fuel hydrogen gas from the fuel hydrogen pressure vessel to the fuel cell. The fuel cell system is mounted on a fuel cell vehicle. The fuel cell system is also used for a cogeneration system.

  The high-pressure pressure vessel is used as a natural gas pressure vessel in a natural gas supply system including a natural gas pressure vessel and a pressure pipe for sending natural gas from the natural gas pressure vessel. A natural gas supply system is used for a cogeneration system together with a generator and a generator driving device. The natural gas supply system is used for a natural gas vehicle including an engine using natural gas as fuel.

  Further, the high-pressure vessel is used as an oxygen pressure vessel in an oxygen gas supply system including an oxygen pressure vessel and a pressure pipe for sending oxygen gas from the oxygen pressure vessel.

  Hereinafter, with reference to FIG. 3 and FIG. 4, the manufacturing method of the liner (1) for pressure vessels is demonstrated.

  First, the first liner constituent member (4) is extruded and the two second liner constituent members (5) are formed by forging or cutting, respectively. A through-hole (8a) is formed in the second liner component (5) having the base attachment portion (8) from the outer end surface of the base attachment portion (8), and is fitted to the inner peripheral surface of the through-hole (8a). A screw (9) is formed.

  Next, the one end surface of the peripheral wall portion (6) of the first liner constituting member (4) and the opening side end surface of the peripheral wall portion (7) of one second liner constituting member (5) are brought into contact (see FIG. 4). Then, the peripheral wall portions (6) and (7) of the liner constituent members (4) and (5) are friction-stir welded using the friction stir welding tool (20) at the contact portion.

  Here, the thickness of the contact portion in the peripheral wall portion (6) of the first liner constituting member (4) and the thickness of the contact portion in the peripheral wall portion (7) of the second liner constituting member (5) are each 0. 5 to 20 mm and equal to each other.

  As shown in FIG. 5 (a), the thickness of the contact portion in the peripheral wall portion of one of the liner constituent members is made larger than the thickness of the contact portion in the peripheral wall portion of the other liner constituent member. In addition, the peripheral wall portions of both liner constituent members may be brought into contact with each other so that the outer peripheral surfaces thereof are located on the same cylindrical surface. Here, the thickness of the contact portion in the peripheral wall portion (7) of the second liner component (5) is larger than the thickness of the contact portion in the peripheral wall portion (6) of the first liner component (4). It has become. Also, as shown in FIG. 5 (b), a liner component having a large thickness, here a liner component having a small thickness on the end surface of the peripheral wall portion (7) of the second liner component (5), A receiving portion (5a) for receiving the peripheral wall portion (6) of the first liner constituent member (4) is integrated with a portion protruding inward from the inner peripheral surface of the peripheral wall portion (6) of the one liner constituent member (4). You may form in. As shown in FIG. 5, even when the thicknesses of the contact portions of the peripheral wall portions (6) and (7) of the two liner component members (4) and (5) are different, the liner component members (4 It is preferable that the thicknesses of (5) and (5) are 0.5 to 20 mm, respectively.

  The friction stir welding tool (20) includes a cylindrical rotor (21) in which a small diameter portion (21a) is integrally formed coaxially with a tapered portion at a tip portion, and a small diameter portion of the rotor (21) ( 21a) is provided with a pin-like probe (22) which is integrally formed coaxially with the small diameter portion (21a) and has a smaller diameter than the small diameter portion (21a). The rotor (21) and the probe (22) are made of a material that is harder than the liner constituent members (4) and (5) and has heat resistance that can withstand frictional heat generated during joining.

  Next, while rotating the rotor (21) and the probe (22) of the friction stir welding tool (20), the peripheral wall portion (6) of the first liner component member (4) and the second liner component member (5) ( 7) The probe (22) is embedded from one side in the circumferential direction at the contact portion between the two, and the shoulder between the small diameter portion (21a) and the probe (22) in the tool (20) Press against both peripheral walls (6) and (7). At this time, by pressing the shoulder, it is possible to obtain a good joined state by preventing scattering of the meat of the softened portion that may occur at the start of joining and during joining, and both peripheral wall portions (6) (7 ) And the shoulder portion to further generate frictional heat to promote softening of the contact portion between the probe (22) and the peripheral wall portions (6) and (7) and the vicinity thereof, and the joint portion. Generation of irregularities such as burrs on the surface of the film can be prevented.

  Next, the first liner constituent member (4) and the second liner constituent member (5) and the friction stir welding tool (20) are relatively moved while rotating the rotor (21) and the probe (22). As a result, the probe (22) is moved in the circumferential direction of the contact portion. Then, both the peripheral wall portions in the vicinity of the contact portion due to frictional heat generated by the rotation of the probe (22) and frictional heat generated by sliding between the peripheral wall portions (6) (7) and the shoulder portion. (6) The metal used as the base material of (7) is softened, and the softened part is stirred and mixed under the rotational force of the probe (22), and further, the softened part fills the probe (22) passage groove. After the plastic flow, the phenomenon of rapidly losing frictional heat and solidifying by cooling is repeated as the probe (22) moves, so that the peripheral wall portions (6) and (7) are joined together. Here, the rotational speed of the probe when the first liner constituent member (4) and the second liner constituent member (5) and the friction stir welding tool (20) are relatively moved is Rrpm, and the first liner constituent member When the relative moving speed between the (4) and the second liner component (5) and the friction stir welding tool (20), that is, the joining speed between the peripheral walls (6) and (7) is Vmm / min, 2 The number of rotations of the probe and the joining speed are adjusted so that ≦ R / V ≦ 12, preferably 2 ≦ R / V ≦ 8.

  When the probe (22) moves over the entire circumference of the contact portion and returns to the embedding position, the peripheral wall portions (6) and (7) are joined over the entire circumference. At this time, a bead (10) is formed. Next, after the probe (22) returns to the implantation position, preferably after passing through the implantation position, the probe (not shown) is placed on the contact member (not shown) arranged at the contact portion of the peripheral wall portions (6) (7). 22) is moved and the probe (22) is pulled out here. It is preferable that the peripheral wall portions (6) and (7) of both liner constituting members (4) and (5) are joined to each other at 360 degrees or more in the circumferential direction. The other second liner constituent member (5) is also friction stir welded to the first liner constituent member (4) in the same manner as described above. In this way, the pressure vessel liner (1) is manufactured.

  In the above embodiment, the reinforcing wall that extends in the length direction of the peripheral wall portion (6) and partitions the inside of the peripheral wall portion (6) into a plurality of spaces is integrally formed with the peripheral wall portion (6) of the first liner component (4). The reinforcing wall may be integrally formed at a position corresponding to the reinforcing wall of the first liner constituent member (4) in the peripheral wall portion (7) of the second liner constituent member (5).

  In the above embodiment, the pressure vessel liner (1) is formed by one first liner constituent member (4) and two second liner constituent members (5), but is not limited thereto. Instead, the one end plate (3) may be formed integrally with the body (2). That is, the first liner constituting member may be a bottomed cylindrical body having one end opened and the other end closed, and constituting the body (2) and one end plate (3). In this case, the second liner constituting member constituting the other end plate (3) is joined to the opening end of the first liner constituting member. When using the second liner constituent member without the base attaching portion, the base attaching portion is formed integrally with the end plate (3) of the first liner constituent member. The bottomed cylindrical first liner constituent member is made by, for example, forging. Furthermore, you may comprise the 1st liner structural member by the several liner structural member divided | segmented in the length direction.

  Furthermore, in the above-described embodiment, the body (2), that is, the peripheral wall portion (6) of the first liner component (4) is circular in cross section, but is not limited to this, and has an appropriate shape, for example, The cross section may have a circular shape. In this case, as a matter of course, the shape of the end plate (3), that is, the second liner constituting member (5) is also changed accordingly.

  Hereinafter, specific examples of the present invention will be described together with comparative examples.

  A plate specimen having a thickness of 5 mm made of JIS A6061-T6 was prepared. Further, a friction stir welding tool (20) in which the rotor and the probe (22) are formed of JIS SKD61 and the diameter of the probe (22) is 5 mm was prepared.

  Next, the side edges of the two specimens are brought into contact with each other, and the rotor (21) and the probe (22) of the friction stir welding tool (20) are rotated. The probe (22) is embedded at one end, and the shoulder between the small diameter portion of the tool (20) and the probe (22) is pressed against both specimens, and both specimens and the friction stir welding tool (20) Are moved relative to each other while rotating the rotor (21) and the probe (22), so that the probe (22) is linearly moved along the contact portion to join the two specimens. . Such a test was performed by changing the probe (22) rotation speed Rrpm and the joining speed Vmm / min.

  And the surface state of the junction part of both test pieces was investigated. Further, the joint was cut to examine the internal state thereof, and the state of the probe (22) was examined. The result is shown in FIG. In FIG. 6, ○ indicates that the internal state of the joint is good, Δ indicates that a defect has occurred inside the joint, ◇ indicates that the probe (22) has been damaged, □ indicates that surface roughness has occurred. From FIG. 6, it can be seen that when R / V is less than 2 (portion below the straight line in FIG. 6), internal defects or damage to the probe (22) occurs. Moreover, when R / V is larger than 12, it turns out that the surface defect and surface roughness have generate | occur | produced in the junction part of both joined specimens.

It is a perspective view which shows the liner for pressure vessels manufactured by the method by this invention. It is a longitudinal cross-sectional view of the high pressure pressure vessel using the liner for pressure vessels of FIG. It is a perspective view which shows the method of manufacturing the liner for pressure vessels of FIG. It is a partial expanded sectional view which similarly shows the method of manufacturing the liner for pressure vessels of FIG. It is a partial expanded sectional view which shows the modification of a liner structural member. It is a graph which shows the result of a specific Example.

Explanation of symbols

(1): Pressure vessel liner
(2): Torso
(3): End plate
(4): First liner component
(5): Second liner component
(6): Perimeter wall
(7): Perimeter wall
(11): High pressure vessel
(12): Fiber reinforced resin layer
(20): Friction stir welding tool
(22): Probe

Claims (17)

A method of manufacturing a pressure vessel liner comprising a cylindrical barrel and a panel that closes both end openings of the barrel by joining at least two liner components formed in a shape that is divided in the longitudinal direction of the barrel. Then, two adjacent liner constituent members are brought into contact with each other, and the probe of the friction stir welding tool is embedded in this contact portion so as to straddle both, and then the two liner members are rotated while rotating the probe. In the method including moving the probe over the entire circumference of the abutting portion by moving the probe relative to each other, and friction stir welding the two liner constituent members,
A pressure vessel liner manufacturing method characterized in that R / V satisfies a condition of 2 ≦ R / V ≦ 12 when the rotational speed of the probe is Rrpm and the joining speed of both liner constituent members is Vmm / min. . The method for manufacturing a liner for a pressure vessel according to claim 1, wherein the R / V satisfies a condition of 2 ≦ R / V ≦ 8. The method for producing a liner for a pressure vessel according to claim 1 or 2, wherein the thickness of the contact portion of both liner constituent members is 0.5 to 20 mm. The manufacturing method of the liner for pressure vessels in any one of Claims 1-3 which friction-stir-joins the contact part of both liner structural members 360 degrees or more in the circumferential direction. All the liner structural members consist of aluminum, The manufacturing method of the liner for pressure vessels in any one of Claims 1-4. A first liner configuration having a first liner configuration member having a cylindrical peripheral wall portion that is open at both ends and forming a barrel, and two second liner configuration members having a dome-shaped peripheral wall configuration that forms a mirror plate, is prepared. The manufacturing method of the liner for pressure vessels in any one of Claims 1-5 which carries out friction stir welding of the surrounding wall part of a member, and the surrounding wall part of a 2nd liner structural member. The method for producing a pressure vessel liner according to claim 6, wherein the first liner constituent member is extruded using aluminum, and the second liner constituent member is formed by forging using aluminum. The liner for pressure vessels manufactured by the method in any one of Claims 1-7. The pressure vessel by which the outer peripheral surface of the liner for pressure vessels described in Claim 8 is covered with the fiber reinforced resin layer. A helically wound fiber layer in which a fiber reinforced resin layer is wound in the longitudinal direction of the trunk so that the reinforcing fiber is placed on both end plates, a hoop wound fiber layer in which the reinforcing fiber is wound around the trunk, and these fiber layers The pressure vessel according to claim 9, comprising a resin impregnated and cured. 11. A fuel cell comprising a fuel hydrogen pressure vessel, a fuel cell, and a pressure pipe for sending fuel hydrogen gas from the fuel hydrogen pressure vessel to the fuel cell, wherein the fuel hydrogen pressure vessel is a pressure vessel according to claim 9 or 10. system. A fuel cell vehicle equipped with the fuel cell system according to claim 11. A cogeneration system comprising the fuel cell system according to claim 11. A natural gas supply system comprising a natural gas pressure vessel and a pressure pipe for sending out natural gas from the natural gas pressure vessel, wherein the natural gas pressure vessel is a pressure vessel according to claim 9 or 10. A cogeneration system comprising the natural gas supply system according to claim 14, a generator, and a generator drive device. A natural gas vehicle comprising the natural gas supply system according to claim 14 and an engine using natural gas as fuel. 11. An oxygen gas supply system comprising an oxygen pressure vessel and a pressure pipe for sending oxygen gas from the oxygen pressure vessel, wherein the oxygen pressure vessel comprises the pressure vessel according to claim 9.

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