JP2013173345A - Method and device for manufacturing high-pressure gas tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for suppressing degradation of assemblability and designability of a high-pressure gas tank.SOLUTION: A thermosetting treatment device 100 is mounted with a tank vessel 10 having, on an outer surface, a fiber layer 21 formed by winding a reinforcing fiber 20 impregnated with a thermosetting resin 22. The thermosetting treatment device 100 heats the tank vessel 10 while rotating it at a predetermined rotating speed. When the thermosetting resin 22 begins to be softened, the thermosetting treatment device 100 changes a mounting angle of the tank vessel 10. Thereby, the softened thermosetting resin 22 in a surface layer of the tank vessel 10 flows from a cylinder part 11 to a dome part 12 in accordance with the gravity along with air bubbles 26 precipitated in the thermosetting resin 22. Accordingly, generation of unevenness due to the air bubbles 26 in the surface layer of the cylinder part 11 can be prevented.

Description

  The present invention relates to a high-pressure gas tank.

  The high-pressure gas tank may be mounted on a moving body such as a fuel cell vehicle, and the weight reduction is required. As a method for reducing the weight of a high-pressure gas tank, a method of manufacturing a high-pressure gas tank by a filament winding method (hereinafter also referred to as “FW method”) is known. In the FW method, a fiber reinforced resin layer is formed by winding a reinforcing fiber impregnated with a thermosetting resin such as an epoxy resin around the outer periphery of a tank container, also called a liner, and thermosetting the thermosetting resin of the reinforcing fiber. It forms (the following patent documents 1 etc.).

  By the way, in the FW method, in the process of thermosetting the thermosetting resin, as the viscosity of the thermosetting resin decreases, the air that has entered the interior of the thermosetting resin or between the reinforcing fibers gradually moves outward. Moving. Therefore, irregularities due to bubbles may occur on the surface layer of the fiber reinforced resin layer. Usually, a fixing member for fixing the high-pressure gas tank is attached to the high-pressure gas tank, or a label or the like for displaying the contents is attached. Therefore, if the surface irregularities of the high-pressure gas tank are caused by the bubbles as described above, there is a possibility that the assembling property and the design property of the high-pressure gas tank are deteriorated.

JP 2010-223243 A JP-A-8-118372

  An object of this invention is to provide the technique which suppresses the assembly | attachment property and designability of a high pressure gas tank.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

[Application Example 1]
A method for manufacturing a high-pressure gas tank, comprising:
(A) preparing a tank container having a fiber layer formed on the outer surface by winding a reinforcing fiber impregnated with a thermosetting resin;
(B) Heating the tank container and performing a resin flow treatment for flowing the thermosetting resin softened by heating to a specific part of the tank container, and thermosetting the thermosetting resin to strengthen the fiber Forming a resin layer.
With this manufacturing method, when thermosetting the thermosetting resin, the excess thermosetting resin, together with the bubbles precipitated in the thermosetting resin, has little effect on the assemblability and design of the high-pressure gas tank. It can flow to a specific part. Therefore, it can suppress that the assembly | attachment property and designability of a high pressure gas tank fall by the bubble which precipitated in the thermosetting resin.

[Application Example 2]
In the manufacturing method according to application example 1, in the resin flow treatment in the step (b), the thermosetting is performed by inclining the arrangement angle of the tank container so that the specific part is on the lower side in the gravity direction. The manufacturing method including the process of making a functional resin flow.
According to this manufacturing method, excess thermosetting resin can be efficiently flowed to a specific site using gravity.

[Application Example 3]
In the manufacturing method according to application example 2, in the resin flow treatment in the step (b), a fluid is further sprayed onto the thermosetting resin to cause the thermosetting resin to flow to the specific portion. The manufacturing method including the process to promote.
If it is this manufacturing method, thermosetting resin can be made to flow to a specific part more reliably.

[Application Example 4]
In the manufacturing method according to application example 1, the resin flow treatment in the step (b) is performed by spraying a fluid onto the softened thermosetting resin, thereby flowing the thermosetting resin to the specific portion. Manufacturing method.
With this manufacturing method, the thermosetting resin can be caused to flow to a specific site by the fluid jet pressure.

[Application Example 5]
5. The manufacturing method according to any one of Application Examples 1 to 4, wherein the tank container includes a cylindrical main body barrel and mirror portions provided on both ends of the main body barrel, respectively. The resin flow treatment of b) is a manufacturing method in which the thermosetting resin is a treatment of flowing the thermosetting resin from the main body barrel portion to at least one of the mirror portions.
According to this manufacturing method, it is possible to suppress the occurrence of unevenness on the surface layer of the main body body of the high-pressure gas tank, which has a great influence on the assemblability and designability of the high-pressure gas tank.

[Application Example 6]
6. The manufacturing method according to any one of Application Examples 2 to 5, wherein the resin flow treatment in the step (b) further includes the flow of the thermosetting resin to a predetermined portion by spraying a fluid. The manufacturing method including the resin flow suppression process which suppresses.
According to this manufacturing method, adhesion of the thermosetting resin to a predetermined portion other than the surface layer of the fiber layer can be suppressed while flowing the thermosetting resin to the specific portion. Therefore, while collecting excess thermosetting resin at a specific site, it is possible to suppress the thermosetting resin from adhering to an extra site, and to further suppress the deterioration of the mountability and designability of the high-pressure gas tank. it can.

[Application Example 7]
The manufacturing method according to Application Example 6, wherein the tank container has a base protruding from the fiber layer, the predetermined portion includes the base, and the resin flow suppression step is performed on the base of the base. The manufacturing method, which is a step of spraying the fluid onto the die at an angle smaller than 90 ° between the protruding direction and the spraying direction of the fluid.
According to this manufacturing method, the thermosetting resin can flow in the direction from the die toward the fiber layer, and adhesion of the thermosetting resin to the die can be suppressed.

[Application Example 8]
In the manufacturing method according to application example 1, the resin flow treatment in the step (b) is performed by causing the thermosetting resin to flow to the specific part by spraying a fluid, thereby causing the heat to be applied to a predetermined part. A manufacturing method, which is a process for suppressing flow of a curable resin.
If it is this manufacturing method, it can suppress that thermosetting resin adheres to extra parts other than the surface layer of a fiber layer, for example in a thermosetting process. Therefore, it is possible to suppress a decrease in the mounting property and design property of the high-pressure gas tank.

[Application Example 9]
It is a manufacturing method as described in any one of application examples 1-8, Comprising: Furthermore, before the said process (b), the said thermosetting resin of the predetermined part adjacent to the said fiber layer of the said tank container is carried out. A manufacturing method comprising a step of attaching a cover member for suppressing adhesion.
If it is this manufacturing method, it can suppress that thermosetting resin adheres to predetermined parts, such as a nozzle | cap | die, with a cover member.

[Application Example 10]
The manufacturing method according to claim 9, wherein the cover member has releasability from the thermosetting resin.
If it is this manufacturing method, a cover member can be easily removed after execution of a thermosetting process.

[Application Example 11]
An apparatus for manufacturing a high-pressure gas tank, heating a tank container having a fiber layer formed by winding a reinforcing fiber impregnated with a thermosetting resin on an outer surface, and softening the thermosetting resin by heating, A manufacturing apparatus provided with the thermosetting process part which thermosets the said thermosetting resin and forms a fiber reinforced resin layer, making it flow to the specific site | part of the said tank container.
According to this manufacturing apparatus, when thermosetting the thermosetting resin of the fiber layer, the excess thermosetting resin is given to the assemblability and design of the high-pressure gas tank together with the bubbles precipitated in the thermosetting resin. It can be made to flow to a specific part with a small influence. Accordingly, it is possible to manufacture a high-pressure gas tank in which a part that greatly affects the assembling property and the design property is smoothed.

[Application Example 12]
The manufacturing apparatus according to Application Example 6, wherein the thermosetting processing unit is configured such that the specific portion is arranged in a direction lower than the gravitational direction so that the thermosetting resin flows to the specific portion according to gravity. A manufacturing apparatus comprising a tank container holding portion that is inclined and held on the side.
If it is this manufacturing apparatus, the softened thermosetting resin can be efficiently flowed to a specific part using gravity.

[Application Example 13]
The manufacturing apparatus according to Application Example 7, wherein the thermosetting processing unit further includes a fluid ejecting unit that sprays a fluid onto the thermosetting resin to promote flow of the thermosetting resin. .
If it is this manufacturing apparatus, thermosetting resin can be made to flow to a specific part more reliably by spraying of the fluid by a fluid injection part.

[Application Example 14]
It is a manufacturing apparatus of the application example 6, Comprising: A manufacturing apparatus provided with the fluid injection part which makes the said thermosetting resin flow to the said specific site | part by spraying a fluid on the softened thermosetting resin.
If it is this manufacturing apparatus, thermosetting resin can be made to flow to a specific part with the jet pressure of fluid.

[Application Example 15]
It is a manufacturing apparatus as described in any one of application examples 11-14, Comprising: It is attached to the position adjacent to the said fiber layer of the said tank container, The said thermosetting resin to site | parts other than the surface layer of the said fiber layer A manufacturing apparatus provided with the cover member which suppresses adhesion.
If it is this manufacturing apparatus, it can suppress that thermosetting resin adheres to site | parts other than the surface layer of a fiber layer during execution of a thermosetting process by a cover member.

[Application Example 16]
It is a manufacturing apparatus of application example 15, Comprising: The said cover member is a manufacturing apparatus which has mold release property with respect to the said thermosetting resin.
If it is this manufacturing apparatus, a cover member can be easily removed after execution of a thermosetting process.

  The present invention can be realized in various forms. For example, a gas tank manufacturing method and manufacturing apparatus, a computer program for realizing the function of the method or apparatus, and a record recording the computer program It can be realized in the form of a medium or the like. Further, the present invention can be realized in the form of a gas tank manufactured by the above-described gas tank manufacturing method and manufacturing apparatus, a system such as a fuel cell system including the gas tank, a vehicle equipped with the gas tank, and the like.

Explanatory drawing which shows the procedure of the manufacturing process of a high pressure gas tank. The schematic diagram for demonstrating the formation method of the fiber layer in the preparation process of a tank container. The schematic diagram which shows the partial schematic cross section of the cylinder part after a fiber layer is formed. The schematic diagram for demonstrating the change of the fiber layer during execution of a thermosetting process. The schematic diagram which shows the example of the use condition of the completed high pressure gas tank. Schematic which shows the structure of a thermosetting processing apparatus. The schematic diagram for demonstrating the change process of the tank attachment angle which is a 1st resin flow process. The schematic diagram for demonstrating the spraying position of the compressed air in a 2nd resin flow process. Explanatory drawing which shows the procedure of the manufacturing process of the high pressure gas tank as 2nd Example. Schematic which shows the structure of the thermosetting processing apparatus which performs the thermosetting process of 2nd Example. Explanatory drawing which shows the procedure of the manufacturing process of the high pressure gas tank as 3rd Example. Schematic which shows the structure of the thermosetting processing apparatus which can perform a 3rd resin flow process. The schematic diagram for demonstrating spraying of the compressed air by the 1st and 2nd air spraying part. Schematic which shows the structure of the thermosetting processing apparatus of 4th Example. Explanatory drawing which shows the procedure of the manufacturing process of the high pressure gas tank as 5th Example.

A. First embodiment:
FIG. 1 is a flowchart showing a procedure of a manufacturing process of a high-pressure gas tank by a filament winding method (FW method) as an embodiment of the present invention. In step S10, a tank container (liner) that constitutes the base portion of the high-pressure gas tank is prepared, and a reinforcing fiber obtained by impregnating a fiber such as an epoxy resin with a thermosetting resin such as an epoxy resin is wound around the outer surface thereof. A fiber layer is formed.

  2 and 3 are schematic diagrams for explaining the tank container preparation step in step S10. FIG. 2A illustrates the tank container 10 before the fiber layer is formed. The tank container 10 is a hollow container having a substantially cylindrical cylinder part 11 constituting a main body part of a high-pressure gas tank and a substantially hemispherical dome part 12 constituting a mirror part of the high-pressure gas tank. The tank container 10 can be comprised with resin materials, such as nylon resin, for example.

  The tops of the two dome parts 12 are respectively located on the central axis CX (illustrated by a one-dot chain line) of the tank container 10, and pipes and valves for circulating high-pressure gas are provided on the top parts of the dome parts 12. A base part 13 to be attached is provided. In addition, the tank container 10 may have another shape and may be configured by other members.

  2 (B) and 2 (C) each illustrate a method of winding the reinforcing fiber 20 around the tank container 10. FIG. 2B shows a method of winding the reinforcing fiber 20 called “hoop winding”. In the hoop winding, the reinforcing fiber 20 is wound with the winding angle of the reinforcing fiber 20 being substantially perpendicular to the central axis CX of the tank container 10. The layer 21f of the reinforcing fiber 20 (hereinafter referred to as “hoop layer 21f”) formed by the hoop winding is mainly formed so as to cover the cylinder portion 11.

  FIG. 2C shows a winding method of the reinforcing fiber 20 called “helical winding”. In helical winding, the reinforcing fiber 20 is wound around the dome portion 12 of the tank container 10 so that the winding direction of the reinforcing fiber 20 is folded back at an acute angle with respect to the central axis CX of the tank container 10. . The layer 21h (referred to as “helical layer 21h”) of the reinforcing fibers 20 formed by the helical winding is formed so as to cover the entire tank container 10.

  FIG. 3 is a schematic diagram illustrating a partial schematic cross section of the cylinder portion 11 after the fiber layer 21 is formed. The fiber layer 21 is formed by laminating a plurality of the above-described hoop layers 21 f and helical layers 21 h on the outer surface of the container wall 14 of the tank container 10. In the manufacturing process (FIG. 1) of the present embodiment, the thermosetting resin impregnated in the reinforcing fibers 20 is heated by heating the entire tank container 10 in which the fiber layer 21 is formed in steps S20 to S50. A heat curing process for curing is performed.

  FIG. 4 is a schematic diagram showing a state of the fiber layer 21 during execution of the thermosetting process. FIG. 4 shows a schematic cross section of the same tank container 10 as in FIG. 3 during the thermosetting process. When the heating of the tank container 10 is started in the thermosetting process, the thermosetting resin 22 impregnated in the reinforcing fibers 20 starts to flow with a reduced viscosity and oozes out to the outside of the reinforcing fibers 20.

  The reinforcing fiber 20 is wound in a tight state before the thermosetting treatment is performed (FIG. 3). However, when the thermosetting resin 22 starts to exude from the reinforcing fiber 20, the tension (tension) of the reinforcing fiber 20 is increased. ) Decreases, and the gap between the reinforcing fibers 20 increases. The thermosetting resin 22 oozes out from the gap between the reinforcing fibers 20 to the outer surface side of the fiber layer 21 to form a resin film 23 on the surface layer of the fiber layer 21.

  Thereafter, the heating by the heating unit 120 is continued, whereby the crosslinking reaction of the thermosetting resin 22 proceeds, and the thermosetting resin 22 of the fiber layer 21 is cured. Hereinafter, the fiber layer 21 after the thermosetting resin 22 is cured is referred to as a “fiber reinforced resin layer 25”.

  Here, the air that has entered the reinforcing fiber 20 together with the thermosetting resin 22 exists in the fiber layer 21. In the fiber layer 21, there is air that has entered the gap between the hoop layer 21 f and the helical layer 21 h and between the reinforcing fibers 20 when the fiber layer 21 is formed. During the thermosetting treatment, such air is deposited as bubbles 26 in the thermosetting resin 22 of the fiber layer 21 when the thermosetting resin 22 has a fluidity before being cured. When the air bubbles 26 move to the resin coating 23, the surface of the fiber reinforced resin layer 25 becomes uneven.

  FIGS. 5A and 5B are schematic diagrams for explaining a problem caused by unevenness generated in the surface layer of the fiber reinforced resin layer 25. FIGS. 5A and 5B show examples of the use state of the completed high-pressure gas tank 15, respectively. For example, when the high-pressure gas tank 15 is mounted on a vehicle or the like, the fastening band 30 may be wound around the cylinder portion 11 and fixed (FIG. 5A). For this reason, if the surface layer of the cylinder part 11 has irregularities, the attachment of such a fixing member may be reduced, and the assembly of the high-pressure gas tank 15 may be reduced.

  Here, a pad 32 for protecting the dome portion 12 may be attached to the dome portion 12 of the high-pressure gas tank 15 (FIG. 5B). On the other hand, the cylinder part 11 of the high-pressure gas tank 15 often remains exposed. Therefore, the unevenness of the surface layer of the cylinder part 11 greatly affects the appearance of the entire high-pressure gas tank 15.

  In addition, a label 31 or the like for displaying contents may be attached to the cylinder portion 11. For this reason, if the surface layer of the cylinder portion 11 has irregularities, the attachment and appearance of such an accessory such as the label 31 may be deteriorated. As described above, the unevenness of the surface layer of the cylinder portion 11 greatly affects the mounting property (mountability) and the design property of the high-pressure gas tank 15.

  Here, after the thermosetting resin 22 has hardened, it is also possible to reduce and remove the irregularities on the surface layer of the cylinder portion 11 by polishing or cutting. However, in this case, the fiber reinforced resin layer 25 may be damaged or deteriorated by such processing.

  Incidentally, as described above, the pad 32 is attached to the dome portion 12 of the high-pressure gas tank 15 to expose the surface thereof, or a fixing member such as the fastening band 30 or an accessory such as the label 31 is attached. Is unlikely. Therefore, even if the surface layer of the dome portion 12 of the high-pressure gas tank 15 is uneven, the influence on the mounting property and design of the high-pressure gas tank 15 is relatively small.

  Therefore, in the manufacturing process of the high-pressure gas tank of the present embodiment, a resin flow process is performed in which the softened thermosetting resin 22 in the resin coating 23 flows from the cylinder part 11 to the dome part 12 during the execution of the thermosetting process. (Steps S30 and S40 in FIG. 1). Thereby, the excess thermosetting resin 22 in the cylinder part 11 can be moved to the dome part 12 together with the bubbles 26. Therefore, the generation of irregularities due to the bubbles 26 on the surface layer of the cylinder portion 11 can be suppressed, and the surface layer of the cylinder portion 11 can be further smoothed.

  FIG. 6 is a schematic diagram illustrating a configuration of a thermosetting processing apparatus 100 capable of performing a resin flow process during the thermosetting process. The thermosetting apparatus 100 includes a control unit 101, a tank mounting unit 110, a heating unit 120, and an air spray unit 130. The control unit 101 can be configured by a microcomputer including a main storage device and a central processing unit, and controls each component of the thermosetting processing apparatus 100.

  The tank mounting part 110 holds the tank container 10 so as to be rotatable at a predetermined rotation speed about the central axis CX. The tank mounting portion 110 is configured to be able to adjust the angle between the central axis CX of the tank container 10 and the horizontal axis (hereinafter referred to as “tank mounting angle”). The tank mounting part 110 includes first and second shafts 111a and 111b, first and second support pillars 112a and 112b, a tank rotation driving part 113, a telescopic driving part 115, and a base part 116. I have.

  The first and second shafts 111a and 111b are fitted and connected to the cap portions 13 of the respective dome portions 12 so as to hold the tank container 10 along the central axis CX. The 1st support pillar 112a is being fixed to the base part 116, and hold | maintains the 1st shaft 111a rotatably. Further, the first support column 112a rotatably holds the first shaft 111a so that the tank mounting angle can be changed.

  The tank rotation driving unit 113 can be configured by a motor, for example, and generates a rotation driving force according to a command from the control unit 101. The second shaft 111 b is connected to the tank rotation driving unit 113 and transmits the rotation driving force of the tank rotation driving unit 113 to the tank container 10. The tank rotation driving unit 113 is rotatably connected to the second support column 112b.

  The second support column 112b is connected to an expansion / contraction driving unit 115 provided in the base unit 116, and is expanded / contracted in a direction substantially perpendicular to the base surface of the base unit 116 by the driving force of the expansion / contraction driving unit 115. To do. The control unit 101 can change the tank mounting angle by controlling the expansion / contraction driving unit 115 to change the expansion / contraction degree of the second support pillar 112b. The thermosetting apparatus 100 executes the change in the tank mounting angle as the first resin flow process, which will be described later in detail.

  The heating unit 120 is provided so that the entire tank container 10 rotated by the rotational driving force of the tank rotation driving unit 113 can be heated at a predetermined temperature (for example, about 130 ° C.). The heating unit 120 may heat the tank container 10 by induction heating.

  The air spray unit 130 includes a pump 131 that outputs compressed air, a nozzle 132 that jets the compressed air output from the pump 131 toward the tank container 10, and a pipe 133 that connects the pump 131 and the nozzle 132. ing. The nozzle 132 is attached so as to be movable along the central axis CX of the tank container 10 in accordance with a command from the control unit 101. The thermosetting processing apparatus 100 executes the spraying of compressed air (air) onto the tank container 10 by the air spraying unit 130 as the second resin flow processing, which will be described in detail later.

  The thermosetting process (FIG. 1) by the thermosetting apparatus 100 is performed as follows. The control unit 101 starts the rotation of the tank container 10 at a predetermined rotation speed (for example, a speed within a range of 0 to 10 rpm) and starts heating by the heating unit 120 (step S20). In this way, by heating the tank container 10 while rotating it, the occurrence of uneven heating temperature in the tank container 10 can be suppressed. At this stage, the tank mounting angle is assumed to be substantially horizontal.

  When the viscosity of the thermosetting resin 22 of the fiber layer 21 has decreased to such a level that it can flow, the control unit 101 starts executing the first resin flow process (step S30). Specifically, the control unit 101 changes the tank mounting angle while continuing to rotate the tank container 10. The control unit 101 may change the tank mounting angle after a predetermined time has elapsed from the start of heating of the tank container 10, or when the temperature of the tank container 10 reaches a predetermined temperature, The tank mounting angle may be changed.

  FIG. 7 is a schematic diagram for explaining the tank attachment angle changing process, which is the first resin flow process. FIG. 7 is substantially the same as FIG. 6 except that the tank mounting angle is different and the arrangement angle of the heating unit 120 is changed in accordance with the change of the tank mounting angle. In FIG. 7, for convenience, a horizontal axis HX indicating the horizontal direction is illustrated by a two-dot chain line.

  The control unit 101 controls the expansion / contraction driving unit 115 to extend the second support column 112b upward in the gravity direction, so that the dome portion 12 on the side connected to the first shaft 111a is lower in the gravity direction. The tank mounting angle is inclined with respect to the horizontal direction. By changing the tank mounting angle, the direction of gravity applied to the thermosetting resin 22 that has oozed out into the surface layer of the fiber layer 21 is changed, and the thermosetting resin 22 is directed toward the dome portion 12 disposed below the gravity direction. Can be made to flow.

  Note that the thermosetting resin 22 gradually gathers at the lowest position of the dome portion 12 and partly falls due to its own weight. Therefore, by this first resin flow treatment, the excess thermosetting resin 22 in the tank container 10 and the bubbles 26 precipitated in the thermosetting resin 22 can be dropped and removed from the tank container 10. Is possible.

  Here, in the first resin flow treatment, in order to ensure that the thermosetting resin 22 reaches the dome portion 12, the tank mounting angle α is preferably about 5 to 30 °. In addition, the tank mounting angle α is adjusted within the preferable range according to the change in the viscosity of the thermosetting resin 22 so that the distribution of the thermosetting resin 22 in the cylinder portion 11 is not biased. Is more preferable.

  Furthermore, the control part 101 starts spraying of the compressed air which is a 2nd resin flow process with the state in which the tank attachment angle was changed (step S40). In the thermosetting treatment apparatus 100, the excess thermosetting resin 22 in the cylinder part 11 flows reliably to the dome part 12 by spraying this compressed air, and the thermosetting resin 22 collected in the dome part 12 is allowed to flow. Drop off from the tank container 10.

  FIGS. 8A and 8B are schematic diagrams for explaining the positions where the compressed air is sprayed in the second resin flow treatment. FIG. 8A shows a schematic side view of the tank container 10 arranged at the tank mounting angle α, and schematically shows the movement locus of the position of the opening of the nozzle 132 with respect to the tank container 10. is there. In FIG. 8A, the position of the opening of the nozzle 132 is illustrated by a broken line that represents the shape of the opening of the nozzle 132.

  FIG. 8B shows a schematic cross section of the cylinder portion 11 when viewed in the direction along the central axis CX, and schematically shows the position where the nozzle 132 sprays the tank container 10 with compressed air. It is shown in FIG. 8B shows an arrow G indicating the direction of gravity, an arrow R indicating the rotation direction of the tank container 10, and an arrow F indicating the spraying direction of the compressed air.

  The nozzle 132 is disposed below the center axis CX of the tank container 10 in the direction of gravity, and faces the rotation direction (arrow R) of the tank container 10 with respect to the lower side surface of the tank container 10 (arrow F) is attached so that compressed air can be sprayed (FIG. 8B). The nozzle 132 is compressed while gradually moving along the central axis CX of the tank container 10 from the dome portion 12 disposed on the upper side in the gravity direction to the dome portion 12 disposed on the lower side in the gravity direction. Air is injected (FIG. 8A).

  By spraying this compressed air, the softened thermosetting resin 22 on the surface layer of the tank container 10 can be guided from the cylinder portion 11 to the dome portion 12 disposed on the lower side in the gravity direction. Then, the thermosetting resin 22 can be blown off from the tank container 10 and dropped off by spraying compressed air against the thermosetting resin 22 collected at the lowest position of the tank container 10. it can.

  Here, it is preferable that the shape of the opening part of the nozzle 132 has a rectangular shape extended in the shape of a flat plate in the direction along the central axis CX of the tank container 10. Accordingly, the compressed air can be sprayed over a wider range in a more concentrated state, and the thermosetting resin 22 can flow more efficiently.

  Further, during the execution of the compressed air spraying process, the tank mounting angle α is preferably set to 5 ° or more, and the flow rate of the compressed air sprayed is preferably set to about 5 to 50 m / s. Thereby, the jet pressure of compressed air can be applied to the thermosetting resin 22 to such an extent that the surface of the resin coating 23 is not roughened, and the excess thermosetting resin 22 is surely placed on the lower side in the gravity direction. The dome portion 12 can be made to flow.

  While the thermosetting resin 22 has fluidity, the control unit 101 appropriately repeats the tank attachment angle changing process and the compressed air spraying process. Then, after the thermosetting resin 22 has been cured, the heating by the heating unit 120 is terminated (step S50 in FIG. 1). In addition, in the thermosetting process, the inventor of the present invention, if the first and second resin flow processes are executed, the cylinder portion is compared with the case where the first and second resin flow processes are not executed It was confirmed that the level difference of the irregularities generated on the surface layer of 11 could be reduced to about 10%.

  After completion of the thermosetting process, the tank container 10 in which the fiber reinforced resin layer 25 is formed is removed from the thermosetting apparatus 100, and a predetermined metal fitting part or the like is attached to the base part 13 or the like (step S60). Thereby, the high-pressure gas tank 15 is completed.

  As described above, in the manufacturing process of the present embodiment, during execution of the thermosetting process, the excess thermosetting resin 22 together with the bubbles 26 is caused to flow from the cylinder portion 11 to the dome portion 12 and the cylinder. It can suppress that an unevenness | corrugation will be formed in the surface layer of the part 11. FIG. Therefore, it can suppress that the attachment property and designability of the high pressure gas tank 15 fall by the unevenness | corrugation which arose in the cylinder part 11. FIG. Moreover, it is possible to omit the cutting and polishing process for smoothing the surface layer of the fiber reinforced resin layer 25 after the thermosetting treatment, and the deterioration of the fiber reinforced resin layer 25 can be suppressed.

B. Second embodiment:
FIG. 9 is a flowchart showing a manufacturing process of a high-pressure gas tank as a second embodiment of the present invention. FIG. 9 is almost the same as FIG. 1 except that the tank attachment angle changing process in step S30 is not provided. In the manufacturing process of the second embodiment, during the thermosetting process, the resin flow process using gravity is not executed, but only the resin flow process by spraying compressed air is executed.

  FIG. 10 is a schematic diagram illustrating a configuration of a thermosetting apparatus 100A that performs the thermosetting process of the second embodiment. FIG. 10 is different from FIG. 6 except that the mechanism for changing the tank mounting angle such as the expansion / contraction driving unit 115 is omitted and the direction in which the compressed air is sprayed by the nozzle 132 of the air spraying unit 130 is different. Is almost the same.

  In the thermosetting apparatus 100A according to the second embodiment, the tank container 10 is rotated at a predetermined rotation speed while the center axis CX is held substantially horizontal, and the thermosetting process is executed. And when the viscosity of the thermosetting resin 22 falls, along with the surface layer of the cylinder part 11, a compressed air is sprayed from the cylinder part 11 toward the dome part 12, and the thermosetting resin which includes the bubble 26 is included. 22 is caused to flow from the cylinder portion 11 to the dome portion 12. In addition, the nozzle 132 is good also as what injects compressed air, moving parallel along the central axis CX.

  As described above, even in the manufacturing process of the second embodiment, the thermosetting resin 22 containing the bubbles 26 is blown from the cylinder portion 11 to the dome portion 12 by spraying compressed air during the thermosetting process. Can be made to flow. Therefore, it is possible to suppress the formation of irregularities on the surface layer of the cylinder portion 11.

C. Third embodiment:
FIG. 11 is a flowchart showing the procedure of the manufacturing process of the high-pressure gas tank by the FW method as the third embodiment of the present invention. The manufacturing process of the high pressure gas tank of the third embodiment is the same as the manufacturing process (FIG. 1) described in the first embodiment, except that a third resin flow process is added as step S42 in the thermosetting process. It is. In the manufacturing process of the high-pressure gas tank of the third embodiment, in step S42, as the third resin flow process, the thermosetting resin 22 flows to a part other than the resin film 23 by the injection of compressed air. The execution of the resin flow suppression process to be suppressed is started.

  FIG. 12 is a schematic view showing a configuration of a thermosetting processing apparatus 100B capable of executing the third resin flow processing. The configuration of the thermosetting apparatus 100B of the third embodiment is the same as that of the first embodiment except that the first and second air spraying portions 140a and 140b for performing the third resin flow treatment are added. This is almost the same as the thermosetting apparatus 100 (FIG. 6) described in the example. However, in the third embodiment, the thermosetting apparatus 100B performs a thermosetting process on a tank container 10A of a type different from the tank container 10 described in the first embodiment.

  The tank container 10A is substantially the same as the tank container 10 (FIG. 2) described in the first embodiment except for the points described below. The tank container 10A has a base part 13 only on one dome part (left side of the paper surface), and does not have a base part 13 on the other dome part 12 (right side of the paper surface). A bottomed hole 12h to which the second shaft 111b of the thermosetting apparatus 100B is connected is provided at the top of the dome portion 12 to which the base portion 13 is not attached, instead of the opening for attaching the base portion 13. Is formed. Note that the thermosetting apparatus 100B of the third embodiment may perform a thermosetting process on the tank container 10 having the two cap portions 13 described in the first embodiment.

  The first and second air spraying portions 140a and 140b are respectively provided corresponding to the dome portions 12 of the tank container 10A. The first and second air spray portions 140a and 140b include pumps 141a and 141b, nozzles 142a and 142b, and pipes 143a and 143b, respectively. The nozzles 142a and 142b are connected to the pumps 141a and 141b via the pipes 143a and 143b, and can compress the compressed air to the top of the dome portion 12. In addition, each nozzle 142a, 142b can be displaced according to the position of the dome part 12, and can adjust the spray angle of compressed air.

  Here, in the thermosetting processing apparatus 100B, when heating is started, the first and second resin flow processes are started, and excess thermosetting resin 22 in the cylinder part 11 flows into the dome part 12 ( Steps S20 to S40 in FIG. However, the first and second resin flow treatments may cause the thermosetting resin 22 to flow to the base portion 13 protruding from the dome portion 12 or the second shaft 111b.

  When the thermosetting resin 22 adheres to the base part 13 and is cured, it is necessary to remove the thermosetting resin 22 in order to ensure the attachment of the component to the base part 13. The operation of removing the thermosetting resin 22 from the base portion 13 causes an increase in the manufacturing cost of the high-pressure gas tank. In the removal operation, a significantly large external force may be applied to the base part 13 in some cases. Therefore, the base part 13 is deformed by the removing operation, and there is a possibility that the mountability of components to the base part 13 is deteriorated.

  Further, the thermosetting resin 22 adhered and cured on the second shaft 111b causes surface roughness of the tank surface layer such as burrs in the vicinity of the bottomed hole 12h of the tank container 10A when the tank container 10A is removed. there is a possibility. Such surface roughness causes a decrease in the designability and mounting properties of the high-pressure gas tank. Moreover, the thermosetting resin 22 that remains attached to the second shaft portion 111b causes deterioration of the fouling of the thermosetting processing apparatus 100B.

  Therefore, in the thermosetting processing apparatus 100B of the third embodiment, the third resin flow processing in step S42 is executed to suppress the adhesion of the thermosetting resin 22 to the base portion 13 and the second shaft 111b. Specifically, compressed air is sprayed onto the base part 13 and the second shaft 111b attached to the dome part 12 by the first and second air spraying parts 140a and 140b. Thereby, it is possible to suppress the thermosetting resin 22 of the dome portion 12 from flowing to the base portion 13 and the second shaft 111b. In addition, the thermosetting resin 22 that has flowed to the base portion 13 or the second shaft 111b can be pushed back to the resin coating 23 of the tank container 10A without direct contact.

  FIGS. 13A and 13B are schematic views for explaining the spraying of compressed air by the first and second air spraying portions 140a and 140b. 13A and 13B, the nozzles 142a and 142b of the first and second air spraying portions 140a and 140b respectively spray compressed air onto the dome portion 12 of the tank container 10A. Is schematically illustrated. In FIGS. 13A and 13B, the center axis CX of the tank container 10A and arrows for explaining the jet angle of compressed air by the first and second air jet portions 140a and 140b are shown. Are shown.

  The 1st air spraying part 140a sprays compressed air with respect to the nozzle | cap | die part 13 (FIG. 13 (A)). More specifically, the compressed air is sprayed onto the connection part of the base part 13 and the dome part 12. On the other hand, the 2nd air spraying part 140b sprays compressed air with respect to the 2nd shaft 111b (FIG. 13 (B)). More specifically, the compressed air is sprayed onto the connection portion between the second shaft 111b and the dome portion 12.

  Here, the first and second air spray portions 140a and 140b are angles between the compressed air spray direction (the opening direction of the nozzles 142a and 142b) and the direction of the central axis CX of the tank container 10A, respectively. Compressed air is injected at an injection angle at which β and γ are each smaller than 90 °. With such a spray angle, an external force by compressed air is applied to the thermosetting resin 22 so that the thermosetting resin 22 does not flow in the direction of the base portion 13 or the second shaft 111b. Can do.

  As described with reference to FIG. 7, the first and second air spray portions 140a and 140b are inclined at the tank mounting angle, and the central axis CX of the tank container 10A has an angle with respect to the horizontal axis. Even if it is, the spraying direction is adjusted so that the spraying angle is maintained. Further, the first and second air spraying portions 140a and 140b have a tank mounting angle inclined, and the dome portion 12 to be sprayed with compressed air is positioned above the other dome portion 12 in the gravity direction. In this case, the spraying of compressed air is temporarily stopped. Accordingly, it is possible to suppress the thermosetting resin 22 from flowing from the dome portion 12 to the cylinder portion 11 due to the jet of compressed air by the first or second air jetting portions 140a and 140b.

  As described above, in the manufacturing process of the high-pressure gas tank of the third embodiment, the thermosetting resin 22 of the dome portion 12 is made to flow while the excess thermosetting resin 22 of the cylinder portion 11 flows to the dome portion 12. It can suppress adhering to the nozzle | cap | die part 13 and the 2nd shaft 111b. Therefore, the base part 13 and the thermosetting treatment apparatus 100A can be protected, and an increase in the manufacturing cost of the high-pressure gas tank can be suppressed. Moreover, the product quality of the high-pressure gas tank is improved by the adhesion of the excessive thermosetting resin, and the deterioration of the assemblability and design of the high-pressure gas tank is suppressed.

D. Fourth embodiment:
FIG. 14 is a schematic view showing the configuration of a thermosetting treatment apparatus 100C used in the manufacturing process of the high-pressure gas tank as the fourth embodiment of the present invention. The configuration of the thermosetting apparatus 100C of the fourth embodiment is the same as that of the thermosetting apparatus 100 of the first embodiment (FIG. 6) except that a cover 150 attached to the base 13 of the tank container 10 is added. Is almost the same. The procedure of the manufacturing process of the high-pressure gas tank in the fourth embodiment is almost the same as the procedure described in the first embodiment (FIG. 1).

  The thermosetting processing apparatus 100C of the fourth embodiment is provided with the cover unit 150, thereby suppressing the fluid of the thermosetting resin 22 from adhering to the base unit 13 during the thermosetting process. Can do. The cover part 150 has a substantially annular shape. The inner peripheral surface of the cover part 150 is in close contact with the outer peripheral surface of the base part 13 when attached to the base part 13. Further, when the cover part 150 is attached to the base part 13, the cover part 150 substantially contacts the surface of the fiber layer 21 of the tank container 10.

  The cover part 150 is attached to the two base parts 13 of the tank container 10 before the tank container 10 is attached to the first and second shafts 111a and 111b of the thermosetting apparatus 100C, and is removed after the thermosetting process. The cover unit 150 may be attached to the first and second shafts 111a and 111b of the thermosetting apparatus 100C, and the first and second shafts 111a and 111b are configured separately. May be.

  Note that the cover 150 is preferably formed of a member having releasability from the thermosetting resin 22 such as silicon or Teflon (registered trademark). Thereby, the cover part 150 can be easily removed after the thermosetting process. It is preferable that the cover part 150 is especially comprised with members which have elasticity, such as a fluorine resin member containing silicon. Thereby, the adhesiveness of the cover part 150 with respect to the nozzle | cap | die part 13 can be improved. Further, it is possible to prevent the base part 13 and the vicinity thereof from being damaged when the cover part 150 is attached or removed.

  As described above, in the case of the thermosetting treatment apparatus 100C according to the fourth embodiment, the thermosetting resin 22 is caused to flow to the dome portion 12 while the excess thermosetting resin 22 of the cylinder portion 11 flows during the thermosetting treatment. Can be prevented from adhering to the base part 13.

E. Example 5:
FIG. 15 is a flowchart showing the procedure of the manufacturing process of the high-pressure gas tank as the fifth embodiment of the present invention. In the manufacturing process of the fifth embodiment, the execution of both the first resin flow process in step S30 and the second resin flow process in step S40 is omitted, and the third resin flow process in step S42 is performed during the thermosetting process. Except that only this is executed, the manufacturing process is substantially the same as that of the third embodiment (FIG. 11). The thermosetting apparatus of the fifth embodiment is for tilting the tank container 10A such as the air spraying section 130 and the expansion / contraction driving section 115 of the thermosetting processing apparatus 100B (FIG. 12) described in the third embodiment. Although the configuration unit is omitted, the illustration and detailed description thereof are omitted.

  If it is the manufacturing process of 5th Example, the thermosetting resin 22 will be made to flow to the mirror part 12 of 10 A of tank containers by spraying of compressed air, and the thermosetting to the nozzle | cap | die part 13 of 10 A of tank containers will be carried out. The thermosetting process can be performed while suppressing the flow of the resin 22. Therefore, it is possible to suppress the deterioration of the mounting property of the parts to the base part 13 of the tank container 10 </ b> A and the design of the base part 13. Moreover, if it is a manufacturing process of 5th Example, adhesion of the thermosetting resin 22 to the connection site | part of the tank container 10A and the 2nd shaft part 111b can be suppressed. Therefore, when removing the tank container 10A from the second shaft portion 111b after the thermosetting treatment, it is possible to suppress the occurrence of surface roughness in the vicinity of the bottomed hole 12h in the mirror part 12 of the tank container 10A. It is possible to suppress a decrease in design properties. Moreover, the contamination of the thermosetting apparatus can be suppressed. In the third resin flow suppression process of the fifth embodiment, compressed air is sprayed onto a portion other than the connection portion with the base 13 and the second shaft portion 111b, and the thermosetting resin 22 is applied to the portion. Adhesion may be suppressed.

F. Variations:
The present invention is not limited to the above-described examples and embodiments, and can be implemented in various modes without departing from the gist thereof. For example, the following modifications are possible.

F1. Modification 1:
In the said 1st Example, the 1st and 2nd resin flow process for making the thermosetting resin 22 softened by heating flow to the dome part 12 of the tank container 10 in the case of a thermosetting process is performed. It was. However, both the first and second flow processes do not have to be executed, and at least one of them may be executed. Specifically, only the first resin flow process in which the tank mounting angle is inclined and the softened thermosetting resin 22 is caused to flow by gravity may be executed. In addition, as in the second embodiment, only the second resin flow process for flowing the softened thermosetting resin 22 may be performed by spraying compressed air. However, it is preferable to execute the first and second resin flow processes in combination because the excess thermosetting resin 22 can flow more reliably from the cylinder portion 11.

F2. Modification 2:
In the above embodiment, the thermosetting resin 22 is caused to flow from the cylinder portion 11 to the dome portion 12 in the resin flow treatment. However, in the resin flow treatment, the thermosetting resin 22 may flow from a portion other than the cylinder portion 11 to a portion other than the dome portion 12. In the resin flow treatment, the softened thermosetting resin 22 on the surface layer of the fiber layer 21 may be flowed to a specific portion of the tank container 10.

F3. Modification 3:
In the first embodiment, in the first resin flow treatment, the tank mounting angle is changed so that one dome portion 12 of the tank container 10 is on the lower side in the gravity direction. However, in the first resin flow treatment, the tank mounting angle may be changed so that the dome portions 12 at both ends of the tank container 10 are alternately on the lower side in the gravity direction.

F4. Modification 4:
In the thermosetting apparatus 100 of the first embodiment, the tank mounting angle is inclined from the horizontal when the thermosetting resin 22 starts to flow after the thermosetting process is started. However, in the thermosetting apparatus 100, the tank mounting angle may be inclined with respect to the horizontal before the start of the thermosetting process.

F5. Modification 5:
In the first embodiment, the flow of the softened thermosetting resin 22 is promoted by spraying compressed air onto the surface layer of the tank container 10. Moreover, in the said 2nd Example, the softened thermosetting resin 22 was made to flow by spraying of compressed air. However, in the first and second embodiments, other fluids may be sprayed onto the thermosetting resin 22 instead of compressed air.

F. Modification 6:
In the third embodiment, in the third resin flow treatment, the compressed air is sprayed onto the base portion 13 of the tank container 10 and the second shaft 111b connected to the tank container 10. However, in the third resin flow treatment, compressed air may be sprayed onto other parts of the tank container. In the third resin flow treatment, compressed air may be sprayed so that the thermosetting resin is prevented from flowing to a portion other than the surface layer of the reinforcing fiber layer of the tank container.

F. Modification 7:
In the said 3rd Example, the thermosetting processing apparatus 100B was performing the 3rd resin flow process, performing the 1st and 2nd resin flow processes. However, the thermosetting treatment apparatus 100B may execute the third resin flow process after the execution of the first and second resin flow processes is finished or once stopped. In addition, the thermosetting apparatus 100B may omit either the first resin flow process or the second resin flow process. That is, in the thermosetting processing apparatus 100B, either the air spray unit 130 or the expansion / contraction drive unit 115 may be omitted.

F. Modification 8:
In the third embodiment, the thermosetting apparatus 100B includes the first and second air spraying portions 140a and 140b. However, the first and second air spraying portions 140a and 140b may be omitted. In this case, for example, the nozzle 132 of the air spray unit 130 may be moved to function as the first and second air spray units 140a and 140b in the third embodiment.

F. Modification 9:
In the fourth embodiment, the thermosetting apparatus 100 </ b> C having the same configuration as the thermosetting apparatus 100 of the first embodiment includes the cover portion 150. However, the cover unit 150 may be applied to a thermosetting apparatus having the same configuration as the thermosetting apparatuses 100B and 100C of the second and third embodiments.

F. Modification 10:
The thermosetting apparatus 100 </ b> C of the fourth embodiment was provided with a cover part 150 for suppressing adhesion of the thermosetting resin 22 to the base part 13. However, the thermosetting treatment apparatus 100 </ b> C includes a cover portion for suppressing adhesion of the thermosetting resin 22 to another predetermined portion instead of the cover portion 150 or in addition to the cover portion 150. Also good.

DESCRIPTION OF SYMBOLS 10,10A ... Tank container 11 ... Cylinder part 12 ... Dome part 12h ... Bottomed hole 13 ... Base part 14 ... Container wall 15 ... High pressure gas tank 20 ... Reinforcing fiber 21 ... Fiber layer 21f ... Hoop layer 21h ... Helical layer 22 ... Heat Curable resin 23 ... Resin coating 25 ... Fiber reinforced resin layer 26 ... Bubble 30 ... Fastening band 31 ... Label 32 ... Pad 100, 100A, 100B, 100C ... Thermosetting apparatus 101 ... Control unit 110 ... Tank mounting part 111a ... No. 1 shaft 111b ... 2nd shaft 112a ... 1st support pillar 112b ... 2nd support pillar 113 ... Tank rotation drive part 115 ... Telescopic drive part 116 ... Base part 120 ... Heating part 130 ... Air spraying part 131 ... Pump 132 ... Nozzle 133 ... Piping 140a, 140b ... thermosetting apparatus 141a, 141b ... Pump 1 2a, 142b ... nozzle 143a, 143b ... pipes 150 ... cover CX ... central axis HX ... horizontal axis

Claims (16)

A method for manufacturing a high-pressure gas tank, comprising:
(A) preparing a tank container having a fiber layer formed on the outer surface by winding a reinforcing fiber impregnated with a thermosetting resin;
(B) Heating the tank container and performing a resin flow treatment for flowing the thermosetting resin softened by heating to a specific part of the tank container, and thermosetting the thermosetting resin to strengthen the fiber Forming a resin layer;
A manufacturing method comprising: The manufacturing method according to claim 1,
The resin flow treatment in the step (b) includes a step of causing the thermosetting resin to flow by inclining the arrangement angle of the tank container so that the specific part is on the lower side in the gravity direction. . The manufacturing method according to claim 2,
The resin flow treatment in the step (b) further includes a step of spraying a fluid onto the thermosetting resin to promote the flow of the thermosetting resin to the specific part. The manufacturing method according to claim 1,
The said resin flow process in the said process (b) is a manufacturing method which is a process which makes the said thermosetting resin flow to the said specific site | part by spraying a fluid on the softened thermosetting resin. It is a manufacturing method as described in any one of Claim 1 to 4, Comprising:
The tank container includes a cylindrical main body barrel, and mirror portions respectively provided at both ends of the main body barrel.
The said resin flow process of the said process (b) is a manufacturing method which is the process which flows the said thermosetting resin from the said main body trunk | drum to at least one said mirror part. A manufacturing method according to any one of claims 2 to 5,
The resin flow treatment of the step (b) further includes a resin flow suppressing step of suppressing flow of the thermosetting resin to a predetermined part by spraying of fluid. The manufacturing method according to claim 6,
The tank container has a base protruding from the fiber layer,
The predetermined part includes the base,
The said resin flow suppression process is a manufacturing method which is a process of spraying the said fluid on the said nozzle | base at an angle between the protrusion direction of the said nozzle | cap | die, and the spraying direction of the said fluid at an angle smaller than 90 degrees. The manufacturing method according to claim 1,
The resin flow process of the step (b) is a process of suppressing the flow of the thermosetting resin to a predetermined part by causing the thermosetting resin to flow to the specific part by spraying a fluid. ,Production method. The manufacturing method according to any one of claims 1 to 8, further comprising:
A manufacturing method comprising a step of attaching a cover member for suppressing adhesion of the thermosetting resin to a predetermined portion adjacent to the fiber layer of the tank container before the step (b). A manufacturing method according to claim 9, wherein
The said cover member is a manufacturing method which has mold release property with respect to the said thermosetting resin. An apparatus for manufacturing a high-pressure gas tank,
A tank container having a fiber layer formed by winding a reinforcing fiber impregnated with a thermosetting resin is heated on the outer surface, and the thermosetting resin softened by heating flows to a specific part of the tank container A manufacturing apparatus comprising a thermosetting treatment unit that thermosets the thermosetting resin to form a fiber-reinforced resin layer. The manufacturing apparatus according to claim 11,
The tank that holds the tank container so that the specific portion is inclined downward in the direction of gravity so that the thermosetting resin flows to the specific portion according to gravity. A manufacturing apparatus provided with a container holding part. The manufacturing apparatus according to claim 12,
The said thermosetting process part is a manufacturing apparatus provided with the fluid injection part which sprays a fluid on the said thermosetting resin further and accelerates | stimulates the flow of the said thermosetting resin. The manufacturing apparatus according to claim 11,
A manufacturing apparatus provided with the fluid injection part which makes the said thermosetting resin flow to the said specific site | part by spraying a fluid on the softened thermosetting resin. The manufacturing apparatus according to any one of claims 11 to 14,
A manufacturing apparatus provided with the cover member which is attached to the position adjacent to the said fiber layer of the said tank container, and suppresses adhesion of the said thermosetting resin to parts other than the surface layer of the said fiber layer. The manufacturing apparatus according to claim 15,
The manufacturing apparatus in which the cover member has releasability from the thermosetting resin.

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