Spinning device and container

Abstract

The present invention addresses the problem of improving the chucking structure of a spinning device 10 in order to enable manufacture of a spherical liner 1 without welding and joining.　The spinning device 10 according to the present invention is capable of forming the spherical liner 1 having a hollow spherical portion 2 and cylindrical portions 3, 4 formed to face each other at both ends of the spherical portion 2, by subjecting both opening ends of a metal cylindrical material 6 to plastic processing. The spinning device 10 comprises a holding chuck 22 (20) that supports a bulging spherical surface portion 5, which later corresponds to an equator portion 5 of the spherical portion 2, in a cylindrical semi-finished product 7 in the course of processing from the cylindrical material 6. The holding chuck 22 (20) has a recessed spherical surface portion 22a that overlaps and abuts on the bulging spherical surface portion 5 of the cylindrical semi-finished product 7 from the outside.

Description

Spinning processing device and container

[0001] The present invention relates to a spinning processing device for plastically processing a metallic cylindrical material, and a container formed by the spinning processing device.

[0002] Conventionally, as a tank used for storage and transportation of, for example, natural gas, hydrogen gas, etc., a pressure vessel in which a metallic container body (hereinafter referred to as a liner) is reinforced with an outer shell made of a fiber reinforced resin is well known. In view of the use of storing and transporting various gases, it is desirable that this type of pressure vessel be as lightweight as possible. The ideal shape as a liner (and thus a pressure vessel) is spherical. This is because a sphere saves the most space and is lightweight.

[0003] However, a metallic spherical liner is curved in a convex curved surface shape as a whole (bulging outwardly in a spherical shape) and has no outer surface part in the form of a cylinder, and cannot be chucked by a conventional spinning processing device. Therefore, conventionally, it is common to manufacture a spherical liner by butt-joining two mirror plates formed into a hemispherical shape by press forming or draw-down with a spatula and welding the butt-joined part.

[0004] Japanese Patent Application Laid-Open No. 2018-126782

[0005] However, when manufacturing a spherical liner by welding, since there is always a welded joint in the spherical liner, the possibility of welding defects cannot be completely avoided, and a non-destructive inspection of the welded joint must be carefully performed. Thus, in the prior art, there is a problem that a great burden is imposed to ensure welding quality.

[0006] In view of the above situation, the applicant focused on a spinning processing device to eliminate welding, and as a result of studying the chucking structure of the spinning processing device, the present invention was completed.

[0007] The present invention relates to a spinning apparatus capable of forming a spherical liner having a hollow spherical portion and cylindrical portions formed opposite to both ends of the spherical portion by plastic deformation of both open ends of a cylindrical metal material, wherein the apparatus is equipped with a gripping chuck that supports an outward-facing spherical bulge portion corresponding to the equator of the later spherical portion in a cylindrical semi-finished product which is an intermediate stage of processing from the cylindrical material, and the gripping chuck has an inward-facing spherical recess that overlaps and contacts the outward-facing spherical portion of the cylindrical semi-finished product from the outside.

[0008] In this specification, the terms "spherical" and "sphere-shaped" are used to broadly include not only spheres in general, but also ellipsoidal shapes and shapes where two end plates are joined together, encompassing an outer shape enclosed by a roughly outward-curving spherical bulge (which can also be called a convex surface). For example, in the shape where two end plates are joined together, a small portion of the outer surface remains cylindrical at the equator. Needless to say, the spinning apparatus of the present invention can also form liners other than spherical shapes (for example, cylindrical ones).

[0009] The material of the liner is not particularly limited as long as it is a metal material that can be plastically processed by a spinning machine. Examples of metal materials include aluminum (Al), magnesium (Mg), titanium (Ti) and their alloys, and various types of steel such as high-tensile steel.

[0010] In the spinning apparatus of the present invention, the gripping chucks may be arranged in a plurality of radial arrangements when viewed from the direction of the central axis of the cylindrical material or the cylindrical semi-finished product.

[0011] Furthermore, the spinning apparatus of the present invention may also have a tip chuck mechanism that grips one end of the cylindrical portion formed on the cylindrical semi-finished product.

[0012] Furthermore, in the spinning apparatus of the present invention, the gripping chuck may be detachably attached to the main body of the apparatus.

[0013] The present invention also includes a container including a liner manufactured using the spinning apparatus described in claims 1 to 4. In the container, the first cylindrical portion of the two cylindrical portions is seamlessly connected to one of two ends located at both ends of the spherical portion along a first direction. The first cylindrical portion has a first opening that connects the internal space of the spherical portion to the outside. The length of the first cylindrical portion in a second direction perpendicular to the first direction is shorter than the length of the spherical portion in the second direction. The second cylindrical portion of the two cylindrical portions is seamlessly connected to the other of two ends of the spherical portion. The second cylindrical portion has a second opening that connects the internal space of the spherical portion to the outside. The length of the second cylindrical portion in the second direction is shorter than the length of the spherical portion in the second direction. The length of the spherical portion in the first direction is 1.5 times or less the length of the spherical portion in the second direction.

[0014] In the container of the present invention, the length of the spherical portion in the first direction may be the same as or shorter than the length of the spherical portion in the second direction.

[0015] In the container of the present invention, the spherical portion may have a dome-shaped first portion whose wall thickness decreases as it moves away from the first cylindrical portion, and a dome-shaped second portion whose wall thickness decreases as it moves away from the second cylindrical portion.

[0016] In the container of the present invention, screw threads may be formed on the outer surface and / or inner surface of the first cylindrical portion and / or the second cylindrical portion.

[0017] In the container of the present invention, a screw hole may be formed in the tip of the first cylindrical portion in the first direction and / or in the tip of the second cylindrical portion in the first direction.

[0018] In the container of the present invention, the first opening of the first cylindrical portion and / or the second opening of the second cylindrical portion may be closed by a lid member.

[0019] The term "container" in this invention is used to represent a broad concept of a container capable of storing gases or liquids, including metal containers without reinforcing fiber bundles and composite containers with reinforcing fiber bundles wrapped around a liner. It goes without saying that the container shape also broadly includes not only spherical containers, but also ellipsoidal containers and containers with two end plates joined together, all of which are enclosed by an outwardly bulging spherical surface (which can also be called a convex surface).

[0020] According to the spinning apparatus of the present invention, the gripping chuck supports the outwardly bulging spherical portion of the cylindrical semi-finished product, thus reliably preventing the cylindrical semi-finished product with the bulging spherical portion already formed from shifting in directions such as the central axis or rotation during spinning. As a result, a seamless spherical liner can be formed with high precision. In particular, since the gripping chuck has an inwardly concave spherical portion that overlaps and contacts the bulging spherical portion of the cylindrical semi-finished product from the outside, the bulging spherical portion of the cylindrical semi-finished product, which has a V-shaped cross-section, can be stably clamped in all directions, and is highly effective in maintaining precision during spinning.

[0021] In the container of the present invention, the length in the first direction relative to the length in the second direction of the main body is shorter than that of a typical cylindrical container, allowing for efficient use of space. Furthermore, in the container of the present invention, the main body, the first cylindrical part, and the second cylindrical part are seamlessly constructed, i.e., composed of a single component, resulting in fewer components compared to conventional containers with equivalent shapes. Thus, according to the present invention, a container with a shape that allows for efficient use of space can be realized with fewer components than conventional containers.

[0022] This is a cross-sectional view showing an example of the container body (liner) in the embodiment. This is a schematic diagram of a spinning apparatus schematically illustrating the first gripping process to the first spinning process. This is a schematic diagram of a spinning apparatus schematically illustrating the second gripping process to the second spinning process. This is a schematic diagram of a spinning apparatus schematically illustrating the third gripping process to the third spinning process. This is a schematic front view of the apparatus body side in the spinning apparatus. This is a schematic perspective view of the first chuck constituting the gripping chuck. This is a schematic perspective view of the second chuck constituting the gripping chuck. This is a flowchart illustrating the spinning process. This is a side view showing the external appearance of the container in the embodiment. This is a cross-sectional view showing the internal structure of the container. This is a cross-sectional view showing the internal structure of the container according to the first modified example. This is a cross-sectional view showing the state in which a lid member is attached to the container according to the first modified example. This is a cross-sectional view showing the internal structure of the container according to the second modified example. This is a cross-sectional view showing the state in which a lid member is attached to the container according to the second modified example. This is a cross-sectional view showing the internal structure of the container according to the third modified example. This is a cross-sectional view showing the state in which a lid member is attached to the container according to the third modified example.

[0023] Next, embodiments of the present invention will be described based on the drawings (Figures 1 to 16).

[0024] First, the liner 1 formed by the spinning apparatus 10 of the present invention will be described with reference to Figure 1. The liner 1 shown in Figure 1 is formed by plastic deformation of both open ends of a metal cylindrical material 6 (see dashed line in Figure 2) using the spinning apparatus 10.

[0025] Liner 1 has a hollow spherical portion 2 and cylindrical portions 3 and 4 formed opposite each other at both ends of the spherical portion 2, and is generally spherical in shape. Both cylindrical portions 3 and 4 are formed in a cylindrical shape. A first cylindrical portion 3 is formed at one end of the spherical portion 2, and a second cylindrical portion 4 is formed at the other end. The spherical portion 2 and the cylindrical portions 3 and 4 are formed integrally (seamlessly) without welding by spinning.

[0026] In the spherical portion 2 of this embodiment, the diameter in the equatorial direction is longer than the diameter in the polar direction. The cylindrical portions 3 and 4 of this embodiment are located opposite each other at both ends of the spherical portion 2 in the polar direction. The opening centers of the cylindrical portions 3 and 4 are located on the central axis PR in the polar direction of the spherical portion 2. The equatorial portion 5, which is the side circumference of the spherical portion 2 in the equatorial direction, bulges outward in a spherical shape (it bulges out in a convex curved shape (which can also be said to be approximately spherical)). In the spherical portion 2, depending on customer requests, for example, the diameter in the equatorial direction may be shorter than the diameter in the polar direction, or they may be the same length. As previously stated, the terms "spherical" and "sphere-shaped" broadly include objects whose outer shape is enclosed by a roughly bulging spherical surface (convex curved surface), and the same applies to the spherical portion 2.

[0027] In this embodiment, the outer diameter of the first cylindrical portion 3 is set to be approximately the same as the outer diameter of the second cylindrical portion 4. For example, a valve or the like (not shown) used for sealing and releasing contents is attached to the first cylindrical portion 3. A sealing member or the like (not shown) is attached to the second cylindrical portion 4. Note that the outer diameters of the first and second cylindrical portions 3 and 4 may be set so that one is larger in diameter and the other is smaller in diameter.

[0028] Furthermore, in order to reduce the weight of the liner 1, the wall thickness t2 of the spherical portion 2 is set to a thin wall thickness t2 that is sufficient to withstand the internal pressure from the contents, and is thinner than the wall thicknesses t3 and t4 of the cylindrical portions 3 and 4. The wall thicknesses t3 and t4 of the cylindrical portions 3 and 4 are set to a thickness t3 and t4 that is sufficient to form threads for mounting valves, for example. In this embodiment, the wall thicknesses t3 and t4 of the cylindrical portions 3 and 4 are approximately the same. However, when comparing the wall thicknesses t3 and t4 of the cylindrical portions 3 and 4, one wall thickness t3 (or t4) may be thicker and the other wall thickness t4 (or t3) may be thinner.

[0029] In this embodiment, a spherical liner 1 is formed by rotating a cylindrical metal material 6 having a predetermined outer and inner diameter around a central axis PR in a spinning device 10, while reducing the diameter (which may also be called spinning or necking) at each open end of the cylindrical material 6 with the forming roller 17 of the spinning device 10.

[0030] Next, the configuration of the spinning apparatus 10 of the present invention will be described with reference to Figures 2 to 7.

[0031] The spinning apparatus 10 includes a side circumferential chuck mechanism 12 that grips the side circumferential portion (body portion) of a cylindrical material 6 or the like from the outside in the circumferential direction (outside in the equatorial direction), a tip chuck mechanism 13 that grips one of the cylindrical portions 3 and 4 (the first cylindrical portion 3 in this embodiment) formed on a cylindrical semi-finished product 7 which is an intermediate stage of processing from the cylindrical material 6, an apparatus body 11 that has the side circumferential chuck mechanism 12 and the tip chuck mechanism 13 and rotates them in conjunction around the rotational axis PR, a rotating mandrel 14 and a stopper 15 that clamp the circumference of one of the cylindrical portions 3 and 4 of the cylindrical semi-finished product 7 from the inside and outside, a heating mechanism 16 such as a burner that heats the processing portion of the cylindrical material 6 or cylindrical semi-finished product 7 to a predetermined temperature, and a forming roller 17 that performs diameter reduction processing on the open end of the cylindrical material 6 or cylindrical semi-finished product 7.

[0032] The term "cylindrical material 6, etc." is used as a concept that includes the cylindrical material 6, the cylindrical semi-finished product 7, and the liner 1. The heating mechanism 16 is not limited to a burner; it may also be an induction heater or the like. Furthermore, there may be more than one forming roller 17. Having multiple forming rollers 17 can contribute to improving the efficiency of the diameter reduction process.

[0033] The main body of the device 11 has a spindle 18 that rotates a side circumferential chuck mechanism 12 and a tip chuck mechanism 13 in conjunction with a drive source such as a motor (not shown). The side circumferential chuck mechanism 12 and the tip chuck mechanism 13 are configured to rotate in conjunction with each other around the rotation center axis PR of the spindle 18 by a drive source such as a motor (not shown). The tip chuck mechanism 13 is linked to the spindle 18. Therefore, the rotation centers of the side circumferential chuck mechanism 12 and the tip chuck mechanism 13 coincide with the rotation center axis PR of the spindle 18.

[0034] The cylindrical material 6 is initially gripped and fixed by the side circumferential chuck mechanism 12 with its own central axis PR (later the central axis PR in the polar direction of the spherical portion 2) aligned with the rotational axis PR of the main shaft portion 18. For this reason, in Figures 1 to 5, the rotational axis PR of the main shaft portion 18 and the central axis PR of the cylindrical material 6 are both denoted by the same symbol PR.

[0035] The circumferential chuck mechanism 12 has a plurality of chuck bases 19 arranged circumferentially on the outer circumference of the main shaft portion 18. In this embodiment, the group of chuck bases 19 is arranged radially in multiple units when viewed from the direction of the rotational axis PR of the main shaft portion 18 (the direction of the central axis PR of the cylindrical material 6, etc. (polar direction)) (eight units in this embodiment). A gripping chuck 20 is detachably fastened to the inner surface of the tip of each chuck base 19 with a bolt 23 or the like, which contacts and grips the circumferential portion (body portion) of the cylindrical material 6, etc. from the circumferential outer side (outside the equator direction). For this reason, the group of gripping chucks 20 is also arranged radially in multiple units when viewed from the direction of the rotational axis PR of the main shaft portion 18 (the direction of the central axis PR of the cylindrical material 6, etc. (polar direction)) (eight units in this embodiment). The group of gripping chucks 20 in this embodiment surrounds the entire circumference of the circumferential portion (body portion) of the cylindrical material 6, etc. (see Figure 5).

[0036] Furthermore, the gripping chucks 20 and chuck bases 19 do not necessarily need to be large or numerous enough to completely surround the entire circumference of the cylindrical material 6, etc. A minimum of two or more chucks at equal intervals along the circumferential direction is sufficient. Ideally, three or more chucks at 120° intervals are preferable.

[0037] As shown in Figures 6 and 7, two types of gripping chucks 20 are used in the embodiment, corresponding to the state (shape) of the cylindrical material 6 to be processed. One is a first chuck 21 having a concave cylindrical surface portion 21a that overlaps and abuts from the outside the arc-shaped side circumference of the cylindrical material 6. The other is a second chuck 22 having a concave spherical surface portion 22a that overlaps and abuts from the outside the bulging spherical surface portion 5, which corresponds to the equator portion 5 of the later spherical portion 2 in the cylindrical semi-finished product 7.

[0038] The concave cylindrical surface portion 21a of the first chuck 21 only needs to be formed as a concave cylindrical surface with an arc-shaped cross-section, recessed along the side circumference of the cylindrical material 6. Similarly, the concave spherical surface portion 22a of the second chuck 22 only needs to be formed as an inwardly spherical shape (concave curved surface, or roughly concave spherical shape) recessed along the outwardly bulging spherical surface portion 5 (equator portion 5 of the spherical portion 2) of the cylindrical semi-finished product 7. In short, both the concave cylindrical surface portion 21a of the first chuck 21 and the concave spherical surface portion 22a of the second chuck 22 only need to be formed as a concave shape (recess shape) that is close enough to or in contact with the object to be gripped (such as the side circumference of the cylindrical material 6 or the bulging spherical surface portion 5 of the cylindrical semi-finished product 7) so that it does not slide or move.

[0039] In Figures 1, 3, and 4, the bulging spherical portion 5 of the cylindrical semi-finished product 7 and the equatorial portion 5 of the spherical portion 2 in the liner 1 are the same, and therefore are denoted by the same reference numeral 5.

[0040] The rotating mandrel 14 is a cylindrical member and is arranged to rotate concentrically with the rotational axis PR of the main shaft portion 18 and to move forward and backward. One of the cylindrical portions 3 and 4 is formed at one open end of the cylindrical material 6, and a stopper 15 is attached to the main shaft portion 18 so as to surround the tip chuck mechanism 13. Then, one of the cylindrical portions 3 and 4 is gripped by the tip chuck mechanism 13, and the rotating mandrel 14 and the stopper 15 then clamp the circumference of one of the cylindrical portions 3 and 4 of the cylindrical semi-finished product 7 from the inside and outside.

[0041] Since the stopper 15 is attached to the main shaft portion 18, it is configured to rotate integrally with the main shaft portion 18 around the rotational axis PR. The rotating mandrel 14 is configured to rotate around the rotational axis PR in conjunction with the main shaft portion 18, and consequently with the side circumferential chuck mechanism 12 and the tip chuck mechanism 13.

[0042] Next, a spinning method for forming a liner 1 using the spinning apparatus 10 of the present invention will be described with reference to Figures 2 to 4 and Figure 8. The spinning method of the embodiment includes a first gripping step, a first heating step, a first spinning step, a second gripping step, a second heating step, a second spinning step, a third gripping step, a third heating step, and a third spinning step.

[0043] Generally speaking, each process is as follows. In the first gripping process, the circumferential portion of the cylindrical material 6 is gripped by the circumferential portion chuck mechanism 12. In the first heating process, one open end portion of the cylindrical material 6 is heated by the heating mechanism 16. In the first spinning process, the cylindrical material 6 is rotated around the rotation center axis PR, and the forming roller 17 is brought into contact with one open end portion of the cylindrical material 6 to perform diameter reduction processing.

[0044] In the second gripping process, after the cylindrical semi-finished product 7 is once removed, one of the cylindrical portions 3 and 4 of the cylindrical semi-finished product 7 is gripped by the tip chuck mechanism 13, and the cylindrical semi-finished product 7 is clamped from the inside and outside around one of the cylindrical portions 3 and 4 by the rotary mandrel 14 and the stopper 15. In the second heating process, the other open end portion of the cylindrical semi-finished product 7 is heated by the heating mechanism 16. In the second spinning process, the cylindrical semi-finished product 7 is rotated around the rotation center axis PR, and the forming roller 17 is brought into contact with the other open end portion of the cylindrical semi-finished product 7 to perform diameter reduction processing to an intermediate state.

[0045] In the third gripping process, after the chucking is changed, the bulging spherical portion 5 of the cylindrical semi-finished product 7 is gripped by the circumferential portion chuck mechanism 12. In the third heating process, the remaining half of the spherical portion 2 that is in the middle of forming and the other of the cylindrical portions 3 and 4 are heated by the heating mechanism 16. In the third spinning process, the cylindrical semi-finished product 7 is rotated around the rotation center axis PR, and the forming roller 17 is brought into contact with the remaining half of the spherical portion 2 that is in the middle of forming and the other of the cylindrical portions 3 and 4 to form the liner 1.

[0046] The forming of the liner 1 by the spinning processing device 10 is performed, for example, according to the following procedure. That is, after the first chuck 21 is bolted to each chuck base 19 of the circumferential portion chuck mechanism 12, the cylindrical material 6 is set, and the circumferential portion of the cylindrical material 6 is gripped from the outer side in the circumferential direction (outer side in the equatorial direction) by the concave cylindrical surface portion 21a of each first chuck 21 (first gripping process). Then, the heating mechanism 16 is advanced so as to approach one open end portion of the cylindrical material 6, and one open end portion of the cylindrical material 6 is heated by the heating mechanism 16 to a set temperature suitable for diameter reduction processing (first heating process).

[0047] Next, when one opening end of the cylindrical material 6 reaches the set temperature, the heating mechanism 16 is retracted, the forming roller 17 is position-adjusted, and then the main shaft portion 18 and thus the side peripheral portion chuck mechanism 12 are rotationally driven to rotate the cylindrical material 6 around the rotation center axis PR. Then, the forming roller 17 is moved toward the rotating cylindrical material 6 and brought into contact with one opening end of the cylindrical material 6 (first spinning step). As a result, one opening end of the cylindrical material 6 is reduced in diameter, and substantially half of the spherical portion 2 and one of the cylindrical portions 3 and 4 (here, the first cylindrical portion 3) are formed (a cylindrical semi-finished product 7 is formed, see FIG. 2).

[0048] Next, the chuck base bodies 19 (first chucks 21) of the side peripheral portion chuck mechanism 12 are retracted to release the gripping of the cylindrical semi-finished product 7 and temporarily remove it. After attaching a stopper 15 to the main shaft portion 18 so as to surround the tip portion chuck mechanism 13, one of the cylindrical portions 3 and 4 of the cylindrical semi-finished product 7 (here, the first cylindrical portion 3) is gripped by the tip portion chuck mechanism 13. Next, the first cylindrical portion 3 of the cylindrical semi-finished product 7 is clamped from the inside and outside by the rotating mandrel 14 and the stopper 15 (second gripping step). Then, the heating mechanism 16 is advanced toward the other opening end of the cylindrical semi-finished product 7, and the other opening end of the cylindrical semi-finished product 7 is heated by the heating mechanism 16 to a set temperature suitable for diameter reduction processing (second heating step).

[0049] Next, when the other opening end of the cylindrical semi-finished product 7 reaches the set temperature, the heating mechanism 16 is retracted, the forming roller 17 is position-adjusted, and then the main shaft portion 18, and thus the tip portion chuck mechanism 13 and the stopper 15, and the rotating mandrel 14 are rotationally driven to rotate the cylindrical semi-finished product 7 around the rotation center axis PR. Then, the forming roller 17 is moved toward the rotating cylindrical semi-finished product 7 and brought into contact with the other opening end of the cylindrical semi-finished product 7 (second spinning step). As a result, the other opening end of the cylindrical semi-finished product 7 is reduced in diameter, and the remaining half of the spherical portion 2 and the other of the cylindrical portions 3 and 4 (here, the second cylindrical portion 4) are formed to an intermediate state (see FIG. 3).

[0050] Next, the rotating mandrel 14 is moved into a retracted position, and the first chuck 21 of each chuck base 19 in the side circumferential chuck mechanism 12 is replaced with the second chuck 22, and the bulging spherical portion 5 of the cylindrical semi-finished product 7 is gripped from the circumferential outer side (outer side in the equatorial direction) by the recessed spherical portion 22a of each second chuck 22 (third gripping step). Then, the heating mechanism 16 is moved forward to approach the remaining half of the spherical portion 2 and the second cylindrical portion 4, which are in the process of being formed, and the heating mechanism 16 heats the remaining half of the spherical portion 2 and the second cylindrical portion 4, which are in the process of being formed, to a set temperature suitable for diameter reduction processing (third heating step).

[0051] Next, when the remaining half of the spherical part 2 and the second cylindrical part 4, which are in the process of being formed, reach the set temperature, the heating mechanism 16 is moved to the retraction position, the molding roller 17 is positioned, and then the main shaft 18, and consequently the side circumferential chuck mechanism 12, the tip chuck mechanism 13, and the stopper 15 are rotated to rotate the cylindrical semi-finished product 7 around the rotational axis PR. Then, the molding roller 17 is moved toward the rotating cylindrical semi-finished product 7, and the molding roller 17 is brought into contact with the remaining half of the spherical part 2 and the second cylindrical part 4, which are in the process of being formed (third spinning step).

[0052] As a result, the remaining half of the spherical portion 2, which is in the process of being formed, and the second cylindrical portion 4 are reduced in diameter, and a spherical liner 1 having a hollow spherical portion 2 and a pair of cylindrical portions 3 and 4 is formed integrally (seamlessly) without welding (see Figure 4). If, in the first spinning process, the spherical portion 2 is formed beyond approximately half to the bulging spherical portion 5 (formed into a shape that goes over the peak), the second gripping process to the second spinning process can be omitted, and at least the rotary mandrel 14 can not be used, further improving the work efficiency during spinning. In this embodiment, the device body 11 that grips the cylindrical material 6 or cylindrical semi-finished product 7 is fixed in position, and the forming roller 17 is moved back and forth toward the device body 11, but conversely, the device body 11 may be moved back and forth relative to the forming roller 17. In this case as well, the forming roller 17 can move in a direction perpendicular to the rotational center axis PR of the main shaft portion 18.

[0053] According to the above configuration, the second chuck 22, which constitutes the gripping chuck 20, supports the bulging spherical portion 5 of the cylindrical semi-finished product 7. Therefore, during spinning, it is possible to reliably prevent the cylindrical semi-finished product 7, which already has the bulging spherical portion 5 formed, from shifting in directions such as the central axis PR direction or the rotational direction. For this reason, a seamless spherical liner 1 can be formed with high precision using the spinning apparatus 10 of the present invention.

[0054] In particular, the second chuck 22 constituting the gripping chuck 20 of the embodiment has a recessed spherical portion 22a that overlaps and contacts the bulging spherical portion 5 of the cylindrical semi-finished product 7 from the outside. Therefore, the bulging spherical portion 5 of the cylindrical semi-finished product 7, which has a V-shaped cross-section, can be stably clamped in all directions, and is highly effective in maintaining accuracy during spinning.

[0055] Furthermore, since the gripping chucks 20 in this embodiment are arranged radially when viewed from the direction of the central axis PR of the cylindrical material 6 or cylindrical semi-finished product 7, the gripping chucks 20 are arranged at least equally spaced intervals along the circumferential direction of the cylindrical material 6 or cylindrical semi-finished product 7, and the group of gripping chucks 20 can hold the cylindrical material 6 or cylindrical semi-finished product 7 in a balanced manner. For this reason, even if the cylindrical material 6 or cylindrical semi-finished product 7 rotates around the central axis PR during spinning, the posture of the cylindrical material 6 or cylindrical semi-finished product 7 can be stabilized. The same applies when the forming roller 17 side with respect to the cylindrical material 6 or cylindrical semi-finished product 7 is rotated around the central axis PR.

[0056] Furthermore, the spinning apparatus 10 of this embodiment has a tip chuck mechanism 13 that grips one of the cylindrical portions 3 and 4 formed on the cylindrical semi-finished product 7 (in this case, the first cylindrical portion 3). Therefore, while the second chuck 22, which constitutes the gripping chuck 20, supports the bulging spherical portion 5 of the cylindrical semi-finished product 7, the tip chuck mechanism 13 can grip one of the cylindrical portions 3 and 4 of the cylindrical semi-finished product 7. The cylindrical semi-finished product 7 can be securely clamped by the bulging spherical portion 5 and one of the cylindrical portions 3 and 4, and the posture stabilization of the cylindrical semi-finished product 7 can be more reliably achieved during spinning.

[0057] Furthermore, since the gripping chucks 20 (first and second chucks 21 and 22) of the embodiment are detachably attached to the device body 11 (each chuck base 19 provided on the device body 11 in the embodiment), setup changes can be performed smoothly, and the work efficiency during spinning can be improved. Although the spinning method of the embodiment includes multiple heating steps, it is not limited to this, and some heating steps may be omitted and the corresponding spinning steps may be performed cold, or all heating steps may be omitted and the entire spinning process may be performed cold.

[0058] Next, a container 32 manufactured using the spinning apparatus 10 of the present invention will be described with reference to Figures 9 and 10. Figure 10 shows the container 32 in a state where it has been cut along line AA in Figure 9. The X-axis (second axis), Y-axis (third axis), and Z-axis (first axis) used in the following description are perpendicular to each other. The X-axis (second axis) and Y-axis (third axis) correspond to the equatorial axis described above, and the Z-axis (first axis) corresponds to the polar axis described above.

[0059] As shown in Figures 9 and 10, the container 32 includes a seamlessly constructed hollow body 34. The body 34 is generally spherical in shape and made of a metal such as aluminum alloy (typically aluminum alloys of the 2000, 5000, 6000, and 7000 series as defined by JIS), and has a space (storage chamber) inside in which gas or liquid can be stored.

[0060] Specifically, the main body 34 includes a dome-shaped (hemispherical) first portion 36 that forms one side of the main body 34 along the Z-axis, and a dome-shaped (hemispherical) second portion 38 that forms the other side of the main body 34 along the Z-axis. The inner surface 36b of the first portion 36 and the inner surface 38b of the second portion 38 define the outer edge of the space (storage chamber) for storing gas or liquid.

[0061] The thickness of the first portion 36 (the distance from the outer surface 36a to the inner surface 36b of the first portion 36) decreases as it approaches the connection point with the second portion 38 (equator portion 5) from the top of the first portion 36, that is, one of the two ends located at both ends of the main body portion 34 along the Z axis (first cylindrical portion 40).

[0062] Furthermore, the thickness of the second portion 38 (the distance from the outer surface 8a to the inner surface 8b of the second portion 8) decreases as it moves from the top of the second portion 38, that is, from the other side of the two ends located at both ends of the main body portion 34 along the Z axis (the second cylindrical portion 42) towards the connection point with the first portion 36 (the equatorial portion 5).

[0063] The length L1 of the main body 34 in the Z-axis direction (distance from the top of the first part 36 to the top of the second part 38) is 1.5 times or less the length L2 of the main body 34 in the X-axis direction (L1 ≤ 1.5 × L2), and preferably, length L1 is the same as or shorter than length L2 (L1 ≤ L2). Similarly, the length L1 of the main body 34 in the Z-axis direction is 1.5 times or less the length L3 of the main body 34 in the Y-axis direction (L1 ≤ 1.5 × L3), and preferably, length L1 is the same as or shorter than length L3 (L1 ≤ L3).

[0064] The container 32 is typically used in an orientation where the longitudinal direction of the spacecraft (the direction in which the thrust of the propulsion system acts) is the Z-axis. Therefore, if the length L1 of the main body 34 in the Z-axis direction is made somewhat shorter than the length L2 in the X-axis direction perpendicular to the Z-axis and the length L3 in the Y-axis direction perpendicular to the Z-axis, the internal space of the spacecraft can be used efficiently when the container 32 is mounted on the spacecraft.

[0065] The base end of the first cylindrical portion 40, which is generally cylindrical in shape, is seamlessly connected to the top of the first portion 36. Similarly, the base end of the second cylindrical portion 42, which is also generally cylindrical in shape, is seamlessly connected to the top of the second portion 38. In other words, the container 32, composed of the main body portion 34, the first cylindrical portion 40, and the second cylindrical portion 42, is a single, seamless component. The first cylindrical portion 40 and the second cylindrical portion 42 are made of the same metal as the main body portion 34.

[0066] The length (width) of the first cylindrical portion 40 in the X-axis or Y-axis direction is shorter than the length L2 in the X-axis direction or the length L3 in the Y-axis direction of the main body portion 34. Needless to say, the cylindrical outer surface 40a of the first cylindrical portion 40 is connected to the outer surface 36a of the first portion 36. The cylindrical inner surface 40b of the first cylindrical portion 40 is connected to the inner surface 36b of the first portion 36.

[0067] Furthermore, the inner surface 40b of the first cylindrical portion 40 constitutes an opening (first opening) that connects the space enclosed by the inner surface 36b of the first portion 36 and the inner surface 38b of the second portion 38 (the internal space of the main body portion 34) to the external space of the main body portion 34. In other words, the inner surface 40b of the first cylindrical portion 40 constitutes a passage that connects to the internal space of the main body portion 34. The end of this passage is open at the tip portion 40c of the first cylindrical portion 40.

[0068] The length (width) of the second cylindrical portion 42 in the X-axis or Y-axis direction is shorter than the length L2 in the X-axis direction or the length L3 in the Y-axis direction of the main body portion 34. Furthermore, the cylindrical outer surface 42a of the second cylindrical portion 42 is connected to the outer surface 38a of the second portion 38. The cylindrical inner surface 42b of the second cylindrical portion 42 is connected to the inner surface 38b of the second portion 38.

[0069] Furthermore, the inner surface 42b of the second cylindrical portion 42 constitutes an opening (second opening) that connects the space enclosed by the inner surface 36b of the first portion 36 and the inner surface 38b of the second portion 38 (the internal space of the main body portion 34) to the external space of the main body portion 34. In other words, the inner surface 42b of the second cylindrical portion 42 also constitutes a passage that connects to the internal space of the main body portion 34. The end of this passage is open at the tip portion 42c of the second cylindrical portion 42.

[0070] In this embodiment, the length of the first cylindrical portion 40 in the X-axis or Y-axis direction is greater than the length of the second cylindrical portion 42 in the X-axis or Y-axis direction. In other words, the first cylindrical portion 40 is thicker than the second cylindrical portion 42. However, this does not apply to the size relationship between the first cylindrical portion 40 and the second cylindrical portion 42. The length of the first cylindrical portion 40 in the X-axis or Y-axis direction may be shorter than the length of the second cylindrical portion 42 in the X-axis or Y-axis direction. The length of the first cylindrical portion 40 in the X-axis or Y-axis direction may be the same as the length of the second cylindrical portion 12 in the X-axis or Y-axis direction.

[0071] As described above, in the container 32 according to the embodiment, when the length of the main body 34 is taken as a reference to the length in the X-axis direction (second direction) or the Y-axis direction (third direction), the length in the Z-axis direction (first direction) is shorter than that of a typical cylindrical container. Therefore, for example, the internal space of a spacecraft, which is long in the direction in which thrust acts, can be efficiently utilized.

[0072] Furthermore, in the container 32 according to this embodiment, the main body 34, the first cylindrical portion 40, and the second cylindrical portion 42 are seamlessly composed of a single part, thus reducing the number of parts (number of components) compared to conventional containers with a similar shape. Thus, according to this embodiment, a container 32 with a shape that efficiently utilizes space can be realized with fewer parts than conventional containers.

[0073] The present invention can be implemented with any modifications without being limited by the embodiments described above. For example, at least one of the inner and outer surfaces 36a, 36b, 38a, and 38b of at least one of the first cylindrical portion 40 and the second cylindrical portion 42 of the container 32 may be provided with screw threads.

[0074] Figure 11 is a cross-sectional view showing the internal structure of the container 102 according to the first modified example. Here, the basic structure of the container 102 according to the first modified example is the same as the structure of the container 32 according to the embodiment described above. Therefore, the parts of the container 102 of the first modified example that are common with the container 32 of the previous embodiment are given the same reference numerals as the container 32, and their detailed description is omitted.

[0075] As shown in Figure 11, male threads 40d are formed on the outer surface 40a of the first cylindrical portion 40, near the tip 40c. Similarly, male threads 42d are formed on the outer surface 42a of the second cylindrical portion 42, near the tip 42c. In this first modified example of the container 102, male threads 40d and 42d are formed on both the first cylindrical portion 40 and the second cylindrical portion 42, but male threads 40d and 42d may be formed on only one of the first cylindrical portion 40 or the second cylindrical portion 42.

[0076] Figure 12 is a cross-sectional view showing a container 102 according to the first modified example with two lid members attached. As shown in Figure 11, the first lid member 54 attached to the first cylindrical portion 40 is made of the same metal as the container 102 of the first modified example. The first lid member 54 has a disc-shaped bottom portion 56 and a cylindrical side portion 58 connected to the bottom portion 56. That is, the first lid member 54 is made in the shape of a bottomed cylinder.

[0077] The bottom portion 56 of the first lid member 54 has a circular outer surface 56a and a circular inner surface 56b located on the opposite side of the outer surface 56a. A side portion 58 protrudes from the inner surface 56b side of the bottom portion 56. The side portion 58 of the first lid member 54 has an outward-facing cylindrical outer surface 58a and an inward-facing cylindrical inner surface. The diameter of the inner surface of the side portion 58 is slightly larger than the diameter of the outer surface 40a of the first cylindrical portion 40. Furthermore, a female thread 58b is formed on the inner surface of the side portion 58, which is screwed into the male thread 40d of the first cylindrical portion 40.

[0078] The first lid member 54 is screwed onto the first cylindrical portion 40 and rotated while engaging the male thread 40d and female thread 58b, and the first cylindrical portion 40 is inserted into the inside of the side portion 58 of the first lid member 54, thereby attaching the first lid member 54 to the first cylindrical portion 40. Then, the opening (first opening) of the first cylindrical portion 40 is closed (sealed) by bringing the inner surface 56b of the bottom portion 56 of the first lid member 54 into close contact with the tip portion 40c of the first cylindrical portion 40.

[0079] Similarly, the second lid member 60, which is attached to the second cylindrical portion 42, is made of the same metal as the container 102 of the first modified example, and has a disc-shaped bottom portion 62 and a cylindrical side portion 64 connected to the bottom portion 62. In other words, the second lid member 60 is configured as a bottomed cylinder.

[0080] The bottom portion 62 of the second lid member 60 has a circular outer surface 62a and a circular inner surface 62b located on the opposite side of the outer surface 62a. A side portion 64 protrudes from the inner surface 62b side of the bottom portion 62. The side portion 64 of the second lid member 60 has an outward-facing cylindrical outer surface 64a and an inward-facing cylindrical inner surface. The diameter of the inner surface of the side portion 64 is slightly larger than the diameter of the outer surface 42a of the second cylindrical portion 42. Furthermore, a female thread 64b is formed on the inner surface of the side portion 64, which is screwed into the male thread 42d of the second cylindrical portion 42.

[0081] The second lid member 60 is screwed onto the second cylindrical portion 42 while engaging the male thread 42d and the female thread 64b, and rotated, thereby inserting the second cylindrical portion 42 into the inside of the side portion 64 of the second lid member 60, and the second lid member 60 is attached to the second cylindrical portion 42. Then, by bringing the inner surface 62b of the bottom portion 62 of the second lid member 60 into close contact with the tip portion 42c of the second cylindrical portion 42, the opening (second opening) of the second cylindrical portion 42 is closed (sealed).

[0082] Figure 13 is a cross-sectional view showing the internal structure of container 112 according to the second modified example. Here, the basic structure of container 112 according to the second modified example is also common to the structure of containers 32 and 102 described above. Therefore, the parts of container 112 of the second modified example that are common to containers 32 and 102 described above are given the same reference numerals as containers 32 and 102, and their detailed explanation is omitted.

[0083] As shown in Figure 13, a female thread 40e is formed on the inner surface 40b of the first cylindrical portion 40, near the tip 40c. Similarly, a female thread 42e is formed on the inner surface 42b of the second cylindrical portion 42, near the tip 42c. In the second modified example container 112, female threads 40e and 42e are formed on both the first cylindrical portion 40 and the second cylindrical portion 42. However, the invention is not limited to this configuration, and female threads 40e and 42e may be formed on only one of the first cylindrical portion 40 or the second cylindrical portion 42.

[0084] Figure 14 is a cross-sectional view showing a container 112 according to the second modified example with two lid members 74 and 80 attached. As shown in Figure 14, the first lid member 74 attached to the first cylindrical portion 40 is constructed in a bolt shape using the same metal as the container 112 of the second modified example, and has a disc-shaped head 76 and a cylindrical shaft portion 78 connected to the central part of the head 76.

[0085] The head 76 of the first lid member 74 has a circular outer surface 76a and a circular inner surface 76b located on the opposite side of the outer surface 76a. The shaft portion 78 protrudes from the inner surface 76b side of the head 76. The shaft portion 78 of the first lid member 74 has an outward-facing cylindrical outer surface. The diameter of the outer surface of the shaft portion 78 is slightly smaller than the diameter of the inner surface 40b of the first cylindrical portion 40. Furthermore, a male thread 78a is formed on the outer surface of the shaft portion 78, which is screwed into the female thread 40e of the first cylindrical portion 40.

[0086] The first lid member 74 is screwed onto the first cylindrical portion 40 and rotated while engaging the female thread 40e and the male thread 78a, and the shaft portion 78 of the first lid member 74 is inserted into the inside of the first cylindrical portion 40, thereby attaching the first lid member 74 to the first cylindrical portion 40. Then, the inner surface 76b of the head portion 76 of the first lid member 74 is brought into close contact with the tip portion 40c of the first cylindrical portion 40, thereby closing (sealing) the opening (first opening) of the first cylindrical portion 40.

[0087] Similarly, the second lid member 80, which is attached to the second cylindrical portion 42, is constructed in a bolt shape using the same metal as the container 112 of the second modified example, and has a disc-shaped head 82 and a cylindrical shaft portion 84 connected to the central part of the head 82.

[0088] The head 82 of the second lid member 80 has a circular outer surface 82a and a circular inner surface 82b located on the opposite side of the outer surface 82a. The shaft portion 84 protrudes from the inner surface 82b side of the head 82. The shaft portion 84 of the second lid member 80 has an outward-facing cylindrical outer surface. The diameter of the outer surface of the shaft portion 84 is slightly smaller than the diameter of the inner surface 42b of the second cylindrical portion 42. Furthermore, a male thread 84a is formed on the outer surface of the shaft portion 84, which is screwed into the female thread 42e of the second cylindrical portion 42.

[0089] The second lid member 80 is screwed onto the second cylindrical portion 42 and rotated while engaging the female thread 42e and the male thread 84a, and the shaft portion 84 of the second lid member 80 is inserted into the inside of the second cylindrical portion 42, thereby attaching the second lid member 80 to the second cylindrical portion 42. Then, by bringing the inner surface 82b of the head portion 82 of the second lid member 80 into close contact with the tip portion 42c of the second cylindrical portion 42, the opening (second opening) of the second cylindrical portion 42 is closed (sealed).

[0090] In the container of the present invention, a screw hole may be formed in at least one of the first and second cylindrical portions (the end in the Z-axis direction). Figures 15 and 16 disclose a modified example in which such a screw hole is formed.

[0091] Figure 15 is a cross-sectional view showing the internal structure of container 122 according to the third modified example. Here, the basic structure of container 122 according to the third modified example is also common to the structures of containers 32, 102, and 112 described above. Therefore, the parts of container 122 of the third modified example that are common to containers 32, 102, and 112 described above are given the same reference numerals as containers 32, 102, and 112, and their detailed explanation is omitted.

[0092] As shown in Figure 15, multiple screw holes 40f are formed in the tip 40c of the first cylindrical portion 40. Also, multiple screw holes 42f are formed in the tip 42c of the second cylindrical portion 42. In the third modified example container 122, screw holes 40f and 42f are provided in both the first cylindrical portion 40 and the second cylindrical portion 42, but the invention is not limited to this, and screw holes 40f and 42f may be formed in only one of the first cylindrical portion 40 or the second cylindrical portion 42.

[0093] Figure 16 is a cross-sectional view showing a container 122 according to the third modified example with two lid members attached. As shown in Figure 16, the first lid member 94 attached to the first cylindrical portion 40 is made of the same metal as the container 122 of the third modified example and is constructed in a disc shape, having a circular outer surface 94a and an inner surface 94b located on the opposite side of the outer surface 94a. The first lid member 94 has a plurality of first through holes 94c that penetrate the first lid member 64 in the thickness direction.

[0094] The first group of through holes 94c in the first lid member 94 are positioned to correspond to a plurality of screw holes 40f formed in the tip portion 40c of the first cylindrical portion 40. The first lid member 94 is attached to the first cylindrical portion 40 by inserting fasteners 96 such as bolts through the first through holes 94c and then inserting them into the corresponding screw holes 40f and tightening them. The opening (first opening) of the first cylindrical portion 40 is then closed (sealed) by bringing the inner surface 94b of the first lid member 94 into close contact with the tip portion 40c of the first cylindrical portion 40.

[0095] Similarly, the second lid member 98, which is attached to the second cylindrical portion 42, is made of the same metal as the container 122 of the third modified example and is constructed in a disc shape, having a circular outer surface 98a and a circular inner surface 98b located on the opposite side of the outer surface 98a. The second lid member 98 has a plurality of second through holes 98c that penetrate through the second lid member 98 in the thickness direction.

[0096] The second group of through holes 98c in the second lid member 98 are positioned to correspond to a plurality of screw holes 42f formed in the tip portion 42c of the second cylindrical portion 42. The second lid member 98 is attached to the second cylindrical portion 42 by inserting a fastener 100 such as a bolt through the second through hole 98c and then inserting it into the corresponding screw hole 42f and tightening it. Then, by bringing the inner surface 98b of the second lid member 98 into close contact with the tip portion 42c of the second cylindrical portion 42, the opening (second opening) of the second cylindrical portion 42 is closed (sealed).

[0097] The configuration of each part in the present invention is not limited to the illustrated embodiment and can be modified in various ways without departing from the spirit of the present invention. For example, in the embodiment, the main shaft portion 18 of the apparatus body 11 was rotated, but conversely, the molding roller 17 may be rotated (swirled) around the central axis PR of the cylindrical material 6 or the like.

[0098] The first cylindrical portion 40 and the second cylindrical portion 42 of the containers 32, 102, 112, and 122 according to the embodiments described above may be used when transporting or supporting the containers 32, 102, 112, and 122. For example, by providing a circular opening in a plate-shaped transporter or support and inserting the first cylindrical portion 40 or the second cylindrical portion 42 into the opening, it becomes possible to fix the containers 32, 102, 112, and 122 in the X and Y directions while allowing movement in the Z direction. Furthermore, by providing screw threads in the circular opening of the transporter or support, it is also possible to fix the container 102 of the first modified example in the Z direction, X direction, and Y direction. In addition, it is possible to combine as appropriate whether male screw threads 40d, 42d, female screw threads 40e, 42e, or screw holes 40f, 42f are formed in each cylindrical portion 40, 42.

[0099] Furthermore, devices that have the function of damping vibrations of the stored liquid or controlling the liquid level of the stored liquid may be placed inside containers 32, 102, 112, and 122. In addition, containers 32, 102, 112, and 122 may be used with a reinforced composite material (such as a bundle of reinforcing fibers) wrapped around them.

[0100] PR Central axis (rotational central axis) 1 Container body (liner) 2 Spherical part 3 First cylindrical part 4 Second cylindrical part 5 Equatorial part 6 Cylindrical material 7 Cylindrical semi-finished product 10 Spinning processing device 11 Device body 12 Side circumference chuck mechanism 13 Tip chuck mechanism 14 Rotating mandrel 15 Stopper 16 Heating mechanism 17 Molding roller 18 Main shaft part 19 Chuck base 20 Gripping chuck 21 First chuck 21a Concave cylindrical surface part 22 Second chuck 22a Concave spherical surface part 23 Bolts 32, 102, 112, 122 Container 34 Main body part 36 First part 38 Second part 40 First cylindrical part 42 Second cylindrical part 54, 74, 94 First lid member 60, 80, 98 Second lid member 96, 100 Fasteners

Claims

1. A spinning apparatus capable of forming a spherical liner having a hollow spherical portion and cylindrical portions formed opposite to both ends of the spherical portion by plastic deformation of both open ends of a cylindrical metal material, wherein the apparatus is equipped with a gripping chuck that supports an outward-facing spherical bulge portion in a cylindrical semi-finished product which is an intermediate processing step from the cylindrical material and corresponds to the equator of the later spherical portion, and the gripping chuck has an inward-facing spherical recessed portion that overlaps and contacts the outward-facing spherical portion of the cylindrical semi-finished product from the outside.

2. The spinning apparatus according to claim 1, wherein the gripping chucks are arranged radially when viewed from the direction of the central axis of the cylindrical material or the cylindrical semi-finished product.

3. The spinning apparatus according to claim 1, further comprising a tip chuck mechanism for gripping one end of the cylindrical portion formed on the cylindrical semi-finished product.

4. The spinning apparatus according to claim 2, wherein the gripping chuck is detachably attached to the main body of the apparatus.

5. A container comprising a liner manufactured using a spinning apparatus as described in any one of claims 1 to 4, wherein the first cylindrical portion of the two cylindrical portions is seamlessly connected to one of two ends located at both ends of the spherical portion along a first direction, the first cylindrical portion has a first opening that connects the internal space of the spherical portion to the outside, the length of the first cylindrical portion in a second direction perpendicular to the first direction is shorter than the length of the spherical portion in the second direction, the second cylindrical portion of the two cylindrical portions is seamlessly connected to the other of two ends of the spherical portion, the second cylindrical portion has a second opening that connects the internal space of the spherical portion to the outside, the length of the second cylindrical portion in the second direction is shorter than the length of the spherical portion in the second direction, and the length of the spherical portion in the first direction is 1.5 times or less the length of the spherical portion in the second direction.

6. The container according to claim 5, wherein the length of the spherical portion in the first direction is the same as or shorter than the length of the spherical portion in the second direction.

7. The container according to claim 6, wherein the spherical portion has a dome-shaped first portion whose thickness decreases as it moves away from the first cylindrical portion, and a dome-shaped second portion whose thickness decreases as it moves away from the second cylindrical portion.

8. The container according to claim 6, wherein screw threads are formed on the outer surface and / or inner surface of the first cylindrical portion and / or the second cylindrical portion.

9. The container according to claim 6, wherein a screw hole is formed in the tip of the first cylindrical portion in the first direction and / or in the tip of the second cylindrical portion in the first direction.

10. The container according to claim 6, wherein the first opening of the first cylindrical portion and / or the second opening of the second cylindrical portion are closed by a lid member.

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