JPH1136986A - Manufacture of pressure vessel and its reinforcement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide manufacturing method of a pressure vessel capable of securely preventing the turbulence of orientation of fibers at the end part of a reinforcement for manufacturing an FRP pressure vessel which is provided with a roughly hemispherical dorm part with an opening part at its center and annular reinforcement coaxially with the opening. SOLUTION: In a manufacturing a pressure vessel, a fiber layer is formed on a mandrel corresponding to the inside form of the pressure vessel (motor case 1), a reinforcement 9 in which at least the end part on the large diameter side is formed in an outward tapered surface 9a is formed and, after the reinforcement 9 is overlapped on the surface of the fiber layer, another fiber layer is formed on the surfaces of the fiber layer and reinforcement 9. Thus fibers passing over the end part of the reinforcement 9 are not bent, and the strength of the fibers is prevented from lowering due to the turbulence of orientation of fibers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an FRP pressure vessel having a substantially hemispherical dome portion having an opening at the center and having an annular reinforcing member provided concentrically with the opening. And a method of manufacturing a reinforcing member made of FRP used for the pressure vessel.

[0002]

2. Description of the Related Art An example of the above-mentioned pressure vessel made of FRP is shown in FIG. 8 (a).
The illustrated pressure vessel is a rocket motor case. The motor case 100 has substantially hemispherical domes 102 and 103 on both sides of a cylindrical portion 101, and circular openings 104 and 105 at the center of each of the domes 102 and 103. Inside each of the openings 104 and 105, a base 106 for fixing an igniter or a rocket nozzle is provided.
107 is provided. In the illustrated case, an annular reinforcing member 108 is provided concentrically with the opening 105 in the dome portion 103 on the tail side on the right side in the figure. The reinforcing member 108 is provided for the purpose of coping with the stress around the opening particularly increasing when the pressure in the motor case 100 increases.

[0003] To manufacture the motor case 100, a filament winding method is used. That is, a mandrel corresponding to the inner shape of the motor case 100 is used, and a fiber impregnated with a thermosetting resin or a fiber impregnated with a resin and semi-cured is continuously wound while rotating the mandrel. Then, when the fiber layer has a predetermined thickness, an annular reinforcing member 108 as shown in FIG. 8B is overlapped at a predetermined position, and the preform is wound again by winding the fiber thereon. Form. The reinforcing member 108 is formed using the same fiber as the motor case 100, for example. The preform thus formed is subjected to a curing treatment by heating and pressurizing, and becomes the FRP motor case 100.

[0004]

However, in manufacturing the conventional motor case (pressure vessel) 100 as described above, the reinforcing member 10 having a constant thickness as a whole is required.
As shown in the enlarged view in FIG. 8A, the fiber F2 passing above the reinforcing member 108 is connected to the fiber F2 passing above the reinforcing member 108 at the end of the reinforcing member 108 as shown in the enlarged view of FIG. In this case, there is a problem that the strength may be reduced due to this, and it has been a problem to solve such a problem.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and comprises a substantially hemispherical dome portion having an opening at the center and an annular reinforcing member provided concentrically with the opening. An object of the present invention is to provide a method for manufacturing a pressure vessel which can reliably prevent disturbance of fiber orientation at the end of a reinforcing member when manufacturing a pressure vessel made of FRP.

A further object of the present invention is to provide a method for manufacturing a reinforcing member for a pressure vessel which is suitable for manufacturing the reinforcing member according to the first aspect.

[0007]

According to a first aspect of the present invention, there is provided a method for manufacturing a pressure vessel, comprising a substantially hemispherical dome portion having an opening in the center and an annular reinforcing member concentrically with the opening. In manufacturing a pressure vessel made of FRP provided with, a fiber layer is formed on a mandrel corresponding to the inner shape of the pressure vessel, and a reinforcing member having at least a large-diameter end portion with an outward tapered surface is formed. After the reinforcing member is superimposed on the surface of the fiber layer, a fiber layer is further formed on the surface of the fiber layer and the reinforcing member, and the above structure is used as a means for solving the conventional problems.

In the above structure, for example, a filament winding method is used to form the fiber layer on the mandrel, and a continuous fiber or a sheet formed from fibers is used as the reinforcing member. The formed fiber layer is subjected to a curing treatment such as heating and pressurization, and becomes a pressure vessel.

According to a second aspect of the present invention, there is provided a method for manufacturing a reinforcing member for a pressure vessel, the method comprising the steps of: Using a molding jig with a gap, wrap the resin impregnated fiber or the resin impregnated and semi-cured fiber from the center of the molding gap of the molding jig to form a preform and cure the preform The reinforcing member is formed by a treatment or semi-hardening treatment, and the end of the reinforcing member is cut off to form an outward tapered surface.
When manufacturing a reinforcing member made of FRP used for the pressure vessel according to claim 1, using a molding jig provided with a molding gap opened on the outer peripheral side, impregnating the fiber or resin impregnated with resin. The semi-cured fiber is wound around the center of the molding gap of the molding jig, and a preform having a step inward through the bent portion near the end is formed, and the preform is cured or semi-cured. A reinforcing member made of FRP for use in the pressure vessel according to claim 1, wherein the stepped portion of the reinforcing member is cut off to form an outward tapered surface by a bent portion. In doing so, using a molding jig provided with a molding gap opened on the outer peripheral side, winding a fiber impregnated with resin or a fiber impregnated with resin and semi-cured from the center of the molding gap of the molding jig At the same time, the diameter of the fiber to be wound is gradually reduced in the vicinity of the end to form a reinforcing member in a preform state, and the portion where the diameter of the fiber of the reinforcing member is gradually reduced is pressurized to form an outward tapered surface. In manufacturing the reinforcing member made of FRP used in the pressure vessel according to claim 1, a plurality of fiber sheets containing resin or a plurality of fiber sheets containing resin and in a semi-cured state are produced. At the same time, the fiber sheet is shifted stepwise at the end to form a reinforcing member in a preform state, and a portion of the reinforcing member where the fiber sheet is shifted stepwise is pressed to form an outward tapered surface. According to a sixth aspect of the present invention, there is provided a molding jig having a molding gap opened on the outer peripheral side when manufacturing the FRP reinforcing member used for the pressure vessel according to the first aspect. A resin-impregnated fiber or a resin-impregnated and semi-cured fiber is wound from the center of the molding gap of the molding jig, and a fiber sheet or resin containing the resin is semi-cured on its outer peripheral side. A plurality of fiber sheets in a state are superimposed, and the fiber sheets are shifted stepwise at the ends, and a reinforcing member is formed by the wound fibers and the fiber sheet on the outer peripheral side thereof, and the fiber sheets are stepped. An outwardly tapered surface is formed by the parts displaced in the shape.

The curing treatment or semi-curing treatment according to claims 2 and 3 includes heating and pressurizing treatments.
Further, the reinforcing member according to claims 4 to 6 is provided in the fiber layer in the method for manufacturing a motor case according to claim 1,
The hardening process can be performed together with the fiber layer of the motor case. Further, in the reinforcing member according to claim 6, after forming a wound fiber portion and a polymerized portion of a fiber sheet to obtain a reinforcing member, the reinforcing member is provided on the fiber layer of the motor case. Alternatively, the wound fiber portion may be formed by a molding jig, attached to the fiber layer of the motor case, and then the fiber sheet may be polymerized on the fiber layer of the motor case.

[0011]

In the method for manufacturing a pressure vessel according to the first aspect of the present invention, as the reinforcing member provided in the fiber layer of the dome, a reinforcing member having an outward tapered surface at least at the large-diameter end is provided. Since the fiber is used, the fiber from the surface of the previously formed fiber layer to the surface of the reinforcing member becomes smoothly continuous due to the tapered surface, and the bending of the fiber at the end of the reinforcing member is prevented.

In the method for manufacturing a reinforcing member for a pressure vessel according to the second aspect of the present invention, when manufacturing the reinforcing member made of FRP used for the pressure vessel according to the first aspect, the entirety has a constant thickness. A preform is formed, and the end of the reinforcing member formed by curing the preform is cut off to form a tapered surface, so that the fiber is forcibly crushed or meandered during the curing process. The occurrence of defects is prevented.

According to a third aspect of the present invention, in the method of manufacturing a reinforcing member for a pressure vessel according to the first aspect, when manufacturing the reinforcing member made of FRP used for the pressure vessel, a bent portion is provided near an end portion. A preform having a step toward the inside is formed, and a step portion of the reinforcing member formed by hardening the preform is cut off to form an outward tapered surface by a bent portion. The occurrence of molding defects such as the fibers being forcibly crushed or meandering during the curing treatment is prevented.

According to a fourth aspect of the present invention, there is provided a method for manufacturing a reinforcing member for a pressure vessel according to the first aspect of the present invention. Is gradually reduced to form a preformed reinforcing member, and the portion of the reinforcing member where the diameter of the fiber is gradually reduced is pressed to form an outward tapered surface, so that the fiber is forcibly crushed or meandering It is possible to prevent the occurrence of molding defects such as dripping.

According to a fifth aspect of the present invention, there is provided a method for manufacturing a reinforcing member for a pressure vessel according to the first aspect of the present invention. The reinforcing member in the preform state is formed by shifting the fiber sheet of the reinforcing member in a stepwise manner to form an outwardly tapered surface. The occurrence of molding defects such as forcible crushing and meandering is prevented.

In the method for manufacturing a reinforcing member for a pressure vessel according to claim 6 of the present invention, when manufacturing the reinforcing member made of FRP used for the pressure vessel according to claim 1, the wound fiber and the fiber on the outer peripheral side thereof are used. Since the reinforcing member is formed by the sheet and the outwardly tapered surface is formed by the stepped portion of the fiber sheet, the fiber is forcibly crushed or meandered as in claim 5. The occurrence of poor molding defects is prevented.

[0017]

According to the method for manufacturing a pressure vessel according to the first aspect of the present invention, since the outwardly tapered surface is formed at least at the large-diameter end of the reinforcing member, the fiber layer formed earlier is formed. The fiber from the surface of the reinforcing member to the surface of the reinforcing member becomes smoothly continuous due to the tapered surface, it is possible to reliably prevent the disorder of the fiber orientation at the end of the reinforcing member, and it has high quality and sufficient strength Pressure vessel can be obtained.

According to the method of manufacturing a reinforcing member for a pressure vessel according to the second aspect of the present invention, when manufacturing the reinforcing member made of FRP used for the pressure vessel according to the first aspect, fibers are hardened during a curing treatment. It is possible to prevent the occurrence of molding failure such as forcibly crushing or meandering, to easily form a tapered surface by cutting off the end of the reinforcing member, and to obtain a good and sufficient fiber orientation. A reinforcing member with a tapered surface having strength can be obtained, and it can contribute to the manufacture of a high-quality motor case.

According to the method of manufacturing a reinforcing member for a pressure vessel according to claim 3 of the present invention, when the reinforcing member made of FRP used for the pressure vessel according to claim 1 is manufactured, the fiber is hardened during the curing treatment. It is possible to prevent the occurrence of molding defects such as forcibly crushing or meandering, and it is possible to easily form a tapered surface by cutting off the step portion of the reinforcing member, and the fiber orientation is good and sufficient A reinforcing member with a tapered surface having strength can be obtained, and it can contribute to the manufacture of a high-quality motor case.

According to the method of manufacturing a reinforcing member for a pressure vessel according to claim 4 of the present invention, when manufacturing the reinforcing member made of FRP used for the pressure vessel according to claim 1, the diameter of the fiber is gradually reduced. The tapered surface can be easily formed without causing molding defects such as the fibers being forcibly crushed or meandering due to the pressurized portion, and the fiber orientation is good and has sufficient strength A reinforcing member having a tapered surface can be obtained, and it can contribute to the manufacture of a high quality motor case.

According to the method of manufacturing a reinforcing member for a pressure vessel according to claim 5 of the present invention, when manufacturing the reinforcing member made of FRP used for the pressure vessel according to claim 1, the fiber sheet is stepped. The tapered surface can be easily formed without causing molding defects such as the fibers being forcibly crushed or meandering due to the pressurization of the shifted ends, and the fiber orientation is good and the strength is sufficient. And a reinforcing member with a tapered surface can be obtained, and it can contribute to the manufacture of a high quality motor case. In addition, since the fiber sheet is used, the production time can be reduced and the molding jig can be simplified as compared with the case where continuous fibers are used, and the fiber orientation can be set in multiple directions. .

According to the method of manufacturing a reinforcing member for a pressure vessel according to claim 6 of the present invention, when manufacturing the reinforcing member made of FRP used for the pressure vessel according to claim 1, the wound fiber and the outer peripheral side thereof are used. The reinforcing member is formed with the fiber sheet of the above, and the outwardly tapered surface is formed by the stepwise displaced portion of the fiber sheet, so that the fiber orientation is multi-directional by the combination of the wound fiber and the fiber sheet. It is possible to obtain a reinforcing member having a tapered surface, which is set and has good fiber orientation and sufficient strength, and can contribute to the manufacture of a high quality motor case.

[0023]

1 and 2 are views for explaining an embodiment of a method for manufacturing a pressure vessel according to claim 1 of the present invention.
FIG. 3 is a view for explaining a method of manufacturing a reinforcing member for a pressure vessel according to claim 2 of the present invention as a method of manufacturing a reinforcing member used in the pressure vessel shown in FIGS. 1 and 2.

The pressure vessel in this embodiment is a motor case of a rocket. Motor case 1 shown in FIG.
Has substantially hemispherical dome portions 3 and 4 on both sides of the cylindrical portion 2, and has a circular opening 5 in the center of each dome portion 3 and 4.
6 is provided. Inside the openings 5 and 6, there are provided bases 7 and 8 for fixing an igniter and a rocket nozzle. In the illustrated case, an annular reinforcing member 9 is provided concentrically with the opening 6 on the dome portion 4 on the tail side on the right side in the figure.

As shown in FIG. 1B, the reinforcing member 9 has a curved tapered shape corresponding to the curvature of the dome portion 4, and has a large diameter side and a small diameter side. , Outwardly tapered surfaces 9a and 9b are formed over the entire circumference.

To manufacture the motor case 1, a filament winding method is used. That is,
As shown in FIG. 2A, a mandrel M corresponding to the inner shape of the motor case 1 is used. The mandrel M is rotatably supported by a main shaft S corresponding to the machine axis direction of the motor case 1. And the mandrel M together with the spindle S
The fiber F impregnated with the thermosetting resin is continuously wound while rotating. On the other hand, the reinforcing member 9 is manufactured as shown in FIGS.

In order to manufacture the reinforcing member 9, as shown in FIG. 3A, a forming jig 12 having a forming gap 11 opened to the outer peripheral side is used. The forming jig 12 includes, on a rotating shaft 13 connected to a driving mechanism, one curved disk 14 corresponding to the inside of the reinforcing member 9 and the other curved disk 15 corresponding to the outside of the reinforcing member 9 coaxially. , Both curved disks 1
A molding gap 11 opened to the outer peripheral side is formed between 4 and 15.

The two curved disks 1 together with the rotating shaft 13
4 and 15, the fiber F impregnated with the thermosetting resin is wound from the center of the molding gap 11 as shown in FIG. Thus, a preform Pr is formed as shown in FIG. This preform Pr has a constant thickness as a whole. Thereafter, the preform Pr is subjected to a heating and pressurizing curing process or a semi-curing process, and becomes the reinforcing member 9.

Further, as shown in FIG. 3 (b), the reinforcing member 9 is held in a state in which the end is protruded by a cutting guide 18, and the entire end of the reinforcing member 9 is formed by an appropriate means such as a grinding device or a cutter. By cutting the circumference, outward tapered surfaces 9a and 9b are formed on the entire circumference of the end portion as shown in FIGS. 2 (g) and 3 (c).

In the process of manufacturing the motor case 1, the reinforcing member 9 is superimposed at a predetermined position on the surface of the fiber layer when the fiber layer has a predetermined thickness, as shown in FIG. 2B. . Thereafter, as shown in FIG. 2C, a fiber F is further wound around the fiber layer and the surface of the reinforcing member 9 to form a fiber layer having a thickness corresponding to that of the motor case 1. The preform Pc shown in FIG. 2 was subjected to a heating and pressurizing curing treatment, and finally the mandrel M was disassembled and taken out to provide a reinforcing member 9 as shown in FIG. The motor case 1 is completed.

As described above, in the method for manufacturing the pressure vessel, the reinforcing member 9 provided in the fiber layer of the dome portion 4 is
Since the reinforcing member 9 having a curved taper shape corresponding to the curvature of the dome portion 4 is used, the reinforcing member 9 hardly deforms when superimposed on the fiber layer. The situation where the fiber wound on the side bends or meanders is also prevented. Further, since the tapered surfaces 9a and 9b are provided on the entire periphery of the end portion of the reinforcing member 9, FIG.
As shown in the enlarged view in (a), the lower and upper fibers F1 and F2 of the reinforcing member 9 are shown. In particular, the fiber F2 from the surface of the fiber layer to the surface of the reinforcing member 9 is smoothly continued by the tapered surface 9a. State. By obtaining a good fiber orientation state as described above, a motor case 1 having sufficient strength can be obtained.

Further, in the method for manufacturing a reinforcing member for a pressure vessel, a preform Pr having a constant thickness as a whole is formed, and the preform Pr is cured or semi-cured. Cut off the end and taper surface 9
Since a and 9b are formed, there is no occurrence of molding defects such as the fibers being forcibly crushed or meandered during the curing treatment or the semi-curing treatment, and the fibers have good fiber orientation and sufficient strength. The reinforcing member 9 having a tapered surface can be obtained, which can contribute to the manufacture of the high quality motor case 1.

FIG. 4 is a view for explaining a method of manufacturing a reinforcing member for a pressure vessel according to claim 3 of the present invention. The target pressure vessel is the motor case 1 shown in FIG.
The reinforcing member is formed in a curved tapered shape.

The reinforcing member 9 shown in FIG. 4C has an outwardly tapered surface 9a formed on the entire periphery of the large-diameter end. In order to manufacture the reinforcing member 9, a forming jig 12 shown in FIG.

The forming jig 12 includes a rotating shaft 13 connected to a driving mechanism, and one curved disk 14 corresponding to the inside of the reinforcing member 9 and the other curved disk 1 corresponding to the outside of the reinforcing member 9.
5 is formed coaxially, and a molding gap 11 opened to the outer peripheral side is formed between the two curved disks 14 and 15. In addition, both curved disks 14 and 15 have inclined portions 14a and 15a that are steps toward the inside of the reinforcing member near the ends on the outer peripheral side of the opposing surfaces.
A molding gap 11 bent at a portion 5a is formed.

Then, in order to manufacture the reinforcing member 9, the fiber F is wound around the center of the molding gap 11 of the molding jig 12 to form the preform Pr. The preform Pr thus formed has a bent portion K formed by the inclined portions 14a and 15a, and has a step of one thickness inward through the bent portion K. Thereafter, the preform Pr is subjected to a curing treatment such as heating and pressurizing or a semi-curing treatment to obtain a reinforcing member 9 having a bent portion K as shown in FIG.

Further, the step portion of the reinforcing member 9 is cut off. That is, as shown in FIG. 4 (b), by cutting along the line from the outer peripheral surface on the distal end side of the bent portion K to the inner peripheral surface of the reinforcing member main body via the bent portion K, FIG. As shown in (), an outward tapered surface 9a formed by the inclined surface of the bent portion K is formed on the entire circumference of the distal end portion of the reinforcing member 9. Even in the method of manufacturing the reinforcing member 9 having the tapered surface, the same effect as that of the previous embodiment can be obtained, and the reinforcing member 9 can contribute to manufacturing a high quality motor case.

FIG. 5 is a view for explaining a method of manufacturing a reinforcing member for a pressure vessel according to claim 4 of the present invention. The target pressure vessel is the motor case 1 shown in FIG.
The reinforcing member is formed in a curved tapered shape.

The forming jig 12 shown in FIG. 5A has the same basic structure as that of the previous embodiment, but the other curved disk 15 corresponding to the outside of the reinforcing member has one curved disk. A plurality of (two in the illustrated case) step portions 15b and 15c are provided around the entire outer peripheral end of the surface facing the disk 14. Due to these steps 15b and 15c, the gap of the molding gap 11 is gradually narrowed at the outer peripheral end.

In manufacturing the reinforcing member, the fiber F impregnated with the thermosetting resin is wound from the center of the molding gap 11 of the molding jig 12 and the diameter of the wound fiber is gradually reduced near the end. . That is, after reaching the first step portion 15b, the fiber Fs having a smaller diameter than the fiber F that has been wound so far is wound, and after reaching the second step portion 15c, the smaller diameter fiber Fs is wound.
wrap s. Thereby, the reinforcing member 9 in a preform state is obtained.

The reinforcing member 9 in the preform state is
As shown in FIG. 5 (b), a pair of pressing jigs 19a, 1
9b, pressure is applied from inside and outside, and as shown in FIG. 5 (c), a portion where the diameter of the fiber is gradually reduced is formed as an outward tapered surface 9a.

The above-described method of manufacturing the reinforcing member 9 can obtain the same effect as that of the above-described embodiment. For example, a fiber having the same diameter is wound up to the end, and the fiber is pressed to form a tapered surface. Compared to the case, there is no fear that the fiber at the end is forcibly crushed and broken. This reinforcing member 9
Is provided in the fiber layer during the manufacturing process of the motor case 1 shown in FIG. 2 and is subjected to a hardening treatment together with the fiber layer of the motor case 1. Therefore, the labor for individually curing the reinforcing members 9 can be omitted.

FIG. 6 is a view for explaining a method of manufacturing a reinforcing member for a pressure vessel according to claim 5 of the present invention. The target pressure vessel is the motor case 1 shown in FIG.
The reinforcing member is formed in a curved tapered shape.

The reinforcing member 9 shown in FIG.
As shown in (a), a plurality of fiber sheets S1 to S4 impregnated with a thermosetting resin are formed, these fiber sheets S1 to S4 are polymerized, and the fiber sheets S1 to S1 are formed all around the end. S4 is shifted stepwise to form the reinforcing member 9 in a preform state. Since each of the fiber sheets S1 to S4 has an adhesive property, the shape of the reinforcing member 9 can be maintained in a polymerized state. And the fiber sheet S1 of the reinforcing member 9
By pressurizing a portion where steps S4 to S4 are shifted stepwise by an appropriate pressurizing means, an outward tapered surface 9a is formed on the entire periphery of the end of the reinforcing member as shown in FIG. 6B.

The same effect as that of the embodiment shown in FIG. 5 can be obtained in the above-described method of manufacturing the reinforcing member 9, and the reinforcing member 9 can contribute to the manufacture of a high-quality motor case. Further, since the fiber sheets S1 to S4 formed of fibers are employed, it is possible to shorten the manufacturing time and simplify the molding jig as compared with the case where continuous fibers are used.

FIG. 7 is a view for explaining a method of manufacturing a reinforcing member for a pressure vessel according to claim 6 of the present invention. The target pressure vessel is the motor case 1 shown in FIG.
The reinforcing member is formed in a curved tapered shape.

The forming jig 12 shown in FIG. 7A has a pair of curved disks 14 and 15 forming the forming gap 11 similarly to the embodiment shown in FIG. In order to manufacture the reinforcing member 9, the fiber F impregnated with the thermosetting resin is wound from the center of the molding gap 11 of the molding jig 12, and as shown in FIG. 9, the curved disk 15 corresponding to the outside of the fiber 9 is removed, and a plurality of fiber sheets S in which a thermosetting resin is impregnated on the outer peripheral side of the wound fiber F
1 to S8 are polymerized and the fiber sheets S1 to S8 are shifted stepwise at the end, and the reinforcing member 9 is formed by the wound fiber F and the fiber sheets S1 to S8 on the outer peripheral side thereof. Further, by performing processing such as pressurization on the reinforcing member 9, as shown in FIG.
An outward tapered surface 9a is formed at the end of the reinforcing member 9 by a portion where the fiber sheets S1 to S8 are shifted stepwise.

The same effect as that of the embodiment shown in FIG. 6 can be obtained even in the method of manufacturing the reinforcing member 9 described above, and the reinforcing member 9 can contribute to manufacturing a high quality motor case. The fiber orientation is set in multiple directions by a combination of the wound fiber F and the fiber sheets S1 to S8. In addition,
In the above embodiment, the wrapping fiber F is formed by the forming jig 12, and the fiber sheets S1 to S1 are formed on one of the curved disks 14.
Although the case of performing the polymerization of No. 8 has been described, only the portion of the wound fiber F is formed by the molding jig 12 and the wound fiber F is attached on the fiber layer of the motor case, and then, is formed on the fiber layer of the motor case. The fiber sheets S1 to S8 can be polymerized, and the stepped portions of the fiber sheets S1 to S8 do not necessarily need to be pressurized.

In each of the above embodiments, continuous fibers
The case where the fiber sheet impregnated with the thermosetting resin is used as the fiber sheet as the fiber sheet using the fiber impregnated with the thermosetting resin has been described. It is also possible to use continuous fibers or fiber sheets in a state of impregnation and semi-curing (tow prepreg).

Further, the fiber sheet may be formed of a fiber impregnated with a thermosetting resin, a fiber impregnated with a thermosetting resin and semi-cured, or formed into a sheet with the fiber. The thermosetting resin may be impregnated or semi-cured, and the thickness or the number of sheets to be polymerized is selected depending on the thickness of the reinforcing member.

In any case, the reinforcing member formed of the fiber and the fiber sheet is finally subjected to a hardening treatment together with the motor case. Alternatively, a semi-curing process is appropriately selected and performed.

[Brief description of the drawings]

FIG. 1 is a sectional view (a) illustrating a motor case as a pressure vessel together with an enlarged view, and a sectional view (b) of a reinforcing member, in one embodiment of a method for manufacturing a pressure vessel according to claim 1 of the present invention. It is.

FIGS. 2A and 2B are explanatory views each showing one side of the manufacturing process (a) to (e) of the motor case, and FIGS.
(G) It is each sectional view of one side omitted showing.

FIG. 3 shows a method for manufacturing a reinforcing member for a pressure vessel according to claim 2 of the present invention, in which a preform is formed on a molding jig (a), an end of the reinforcing member is cut off (b),
And a state in which a tapered surface is formed at the end of the reinforcing member (c)
It is sectional drawing of the principal part which shows each.

FIG. 4 is a diagram illustrating a method of manufacturing a reinforcing member for a pressure vessel according to claim 3 of the present invention, in which a preform is formed on a forming jig (a), an end of the reinforcing member is cut off (b),
And a state in which a tapered surface is formed at the end of the reinforcing member (c)
It is sectional drawing of the principal part which shows each.

FIG. 5 is a diagram showing a state in which a reinforcing member is formed on a molding jig, a state in which an end of the reinforcing member is pressed, and a state in which the reinforcing member for a pressure vessel is manufactured according to the method of claim 4 of the present invention. It is sectional drawing of each principal part which shows the state (c) which formed the taper surface in the edge part of the reinforcement member.

FIG. 6 is a cross-sectional view showing a state in which a reinforcing member is formed by polymerizing a fiber sheet and a tapered surface by pressing an end of the reinforcing member in the method for manufacturing a reinforcing member for a pressure vessel according to claim 5 of the present invention. It is sectional drawing of each principal part which shows the state (b) which formed.

FIG. 7 is a view showing a state in which fibers are wound around a molding jig (a), a state in which a fiber sheet is superposed (b), and an end of the reinforcing member in the method for manufacturing a reinforcing member for a pressure vessel according to claim 6 of the present invention. It is sectional drawing of each principal part which shows the state (c) in which the taper surface was formed in the part.

8A and 8B are a cross-sectional view illustrating a motor case as an example of a conventional pressure vessel together with an enlarged view, and a cross-sectional view of a reinforcing member.

[Explanation of symbols]

 Reference Signs List 1 motor case (pressure vessel) 4 dome part 6 opening part 9 reinforcing member 9a 9b tapered surface 11 molding gap 12 molding jig F Fs Fss fiber K bent part M mandrel Pr preform S1 to S8 fiber sheet

──────────────────────────────────────────────────の Continued on front page (51) Int.Cl. ⁶ Identification code FI B29L 22:00

Claims (6)

[Claims] 1. A method for manufacturing an FRP pressure vessel having a substantially hemispherical dome portion having an opening in the center and having an annular reinforcing member concentrically with the opening corresponds to the inner shape of the pressure vessel. Forming a fiber layer on the mandrel to be formed, forming a reinforcing member having at least a large-diameter side end portion with an outward tapered surface, superimposing the reinforcing member on the surface of the fiber layer, and then forming the fiber layer and the reinforcing member. A method for producing a pressure vessel, further comprising forming a fiber layer on a surface. 2. An F used for the pressure vessel according to claim 1.
When manufacturing a reinforcing member made of RP, using a molding jig provided with a molding gap opened on the outer peripheral side, a fiber impregnated with resin or a fiber impregnated with resin and semi-cured to form a molding jig. The preform is formed by winding the preform from the center of the molding gap, and the preform is cured or semi-cured to form a reinforcing member, and the end of the reinforcing member is cut off to form an outward tapered surface. Of manufacturing a reinforcing member for a pressure vessel. 3. The F used in the pressure vessel according to claim 1.
When manufacturing a reinforcing member made of RP, using a molding jig provided with a molding gap opened on the outer peripheral side, a fiber impregnated with resin or a fiber impregnated with resin and semi-cured to form a molding jig. While being wound from the center of the molding gap, a preform having a step inward through a bent portion near the end is formed, and the preform is subjected to hardening treatment or semi-curing treatment to form a reinforcing member, and a step portion of the reinforcing member And forming a tapered surface outward by the bent portion. 4. An F used for the pressure vessel according to claim 1.
When manufacturing a reinforcing member made of RP, using a molding jig provided with a molding gap opened on the outer peripheral side, a fiber impregnated with resin or a fiber impregnated with resin and semi-cured to form a molding jig. While being wound from the center of the molding gap, the diameter of the fiber to be wound is gradually reduced in the vicinity of the end to form a reinforcing member in a preform state. A method for manufacturing a reinforcing member for a pressure vessel, characterized by forming a tapered surface in an orientation. 5. The F used in the pressure vessel according to claim 1.
When manufacturing a reinforcing member made of RP, a plurality of fibrous sheets containing resin or a plurality of fibrous sheets containing resin and in a semi-cured state are polymerized, and the fibrous sheets are displaced stepwise at the ends to form a preform. Forming a reinforcing member,
A method for manufacturing a reinforcing member for a pressure vessel, wherein a portion of the reinforcing member in which a fiber sheet is displaced in a stepwise manner is pressed to form an outward tapered surface. 6. The F used for the pressure vessel according to claim 1.
When manufacturing a reinforcing member made of RP, using a molding jig provided with a molding gap opened on the outer peripheral side, a fiber impregnated with resin or a fiber impregnated with resin and semi-cured to form a molding jig. Wound from the center of the molding gap, and on the outer peripheral side,
A fiber sheet containing a resin or a plurality of fiber sheets containing a resin and in a semi-cured state are polymerized, and the fiber sheet is shifted stepwise at the ends, and the wound fiber and the fiber sheet on the outer peripheral side thereof are wound. And forming a reinforcing member for the pressure vessel, and forming an outwardly tapered surface by a portion obtained by shifting the fiber sheet in a stepwise manner.