JP2001038752A - Apparatus and method for molding composite material curved surface panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus and a method for molding a composite material curved surface panel capable of obtaining the panel without wrinkle, waviness, void and the like with a uniform plate thickness. SOLUTION: The apparatus and the method for molding a composite material curved surface panel comprises the steps of laminating a plurality of unidirectional fiber prepregs on a molding face 12 of a mold 11, sequentially superposing an upper plate 18, a ventilating woven fabric 20 and a bag film 21 on the prepregs 30, evacuating an interior of the film 21, and pressurizing and heating the prepregs to cure the prepregs, and further comprises the steps of superposing a band-like upper mold plate urging material 19 on an upper mold plate 18, and holding ends of the material 19 and the prepregs by a tensioning unit 15 to prevent a gap between the prepregs 30 and the plate 18, thereby preventing flow of excess resin in an uncured state. As a result, the panel having a uniform thickness and no wrinkle, no waviness, no void is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for forming a composite curved panel reinforced by fibers.

[0002]

2. Description of the Related Art In recent years, various fiber-reinforced resin composite materials have been used in various industrial fields such as aircraft and automobiles, and the tendency has been increasing.

[0003] A molding method for molding a composite curved panel is as follows.
For example, as shown in FIG. 8, the resin is preliminarily applied to the fibers on a molding surface 101 a of a molding die 101 having a shape corresponding to the shape of the composite material curved panel to be molded, for example, a substantially parabolic cross section. Laminate a plurality of impregnated prepregs,
On this prepreg 102, a thin and flexible upper mold plate 103, a ventilation fabric 104, and a bag film 105, which are formed from a composite material, are sequentially stacked, and the edge of the bag film 105 and the molding surface 101a of the molding die 101. The airtightness in the bag film 105 is maintained by interposing a sealant 106 between the two. Further, the bag film 10 having airtightness is maintained.
There is a vacuum bag molding method in which the prepreg 102 is hardened by applying pressure and heating in an autoclave (not shown) in a state where the inside of the prepreg 102 is evacuated and the prepreg 102 is pressed against the mold 101.

In this method of molding a reduced pressure bag, a cross section of a main part of the prepreg 102 before curing is shown in FIG.
When the pressure in the autoclave can is increased during the curing process, as shown in FIG. ,
As shown in FIG. 3A, the pressure P in the autoclave can acts on the prepreg 102 via the upper die plate 103. The horizontal component P1 and the vertical component P2 of the pressure P acting on the upper mold plate 103 satisfy P1> P2.

However, the deformation of the upper die plate 103 cannot follow the decrease in the thickness T of the prepreg 102 due to the curing progress from this state, and the prepreg 102 and the prepreg 102 are not cured as shown in FIG. A gap L is generated between the mold plate 103 and the mold plate 103.

Then, due to the gap L, first, the relatively large horizontal component P
The side part 103a of the upper die plate 103 on which the first part 1 acts presses the side part 102a of the prepreg 102. This pressing prevents the top 103b of the upper mold plate 103 from descending, and FIG.
As shown in (c), the uncured excess resin 102c in the side surface portion 102a of the prepreg 102 pressed by the side portion 103a of the upper die plate 103 is pushed up to the top surface portion 102b side, and the prepreg 102 is cured in that state. And
The composite material curved panel 100 is obtained by releasing the mold.

The composite material curved panel 100 obtained in this manner has a side wall 1 as shown in the cross section in FIG.
00a is relatively thin, and the thickness T2 near the top surface 100b is relatively thick, making it difficult to obtain a uniform thickness.
In particular, there is a concern that the shape rigidity of the side portion 100a may be reduced to induce deformation such as spring-in.

In the curing process, the uncured surplus resin 102c on the side surface 102a of the pressed prepreg 102 flows in the direction of the top surface 102b, so that the composite curved panel 100 shown in FIG. , Undulations, voids, ie, internal residual bubbles 100c may be generated near the top surface 100b.

As a countermeasure against this, Japanese Patent Application Laid-Open No. 10-29686
As disclosed in Japanese Unexamined Patent Publication No. 4 and outlined in FIG.
For example, a plurality of unidirectional fiber prepregs are laminated in different directions on a molding surface 101a of a molding die 101 having a substantially parabolic cross section, and the molding surface 1 of the prepreg 102 is formed.
The edge of the unidirectional fiber prepreg, in which the fibers extend along the bending direction 01a, is held in the molding die 101 by a tension applying device 107 including a tension plate 107a having a substantially L-shaped cross section and a plate-shaped restraining plate 107b. At the same time, the upper die plate 103 and the ventilation fabric 10 are placed on the laminated prepreg 102.
4. The bag film 105 and the like are sequentially stacked, and a sealant 106 is interposed between the edge of the bag film 105 and the molding surface 101a of the mold 101 to form the bag film 105.
Keep airtight inside.

Then, the inside of the bag film 105 is evacuated to press the prepreg 102 against the molding die 101, and the portion of the prepreg 102 near the tension applying device 107 is formed by the step between the molding surface 101a and the tension plate 107a. The prepreg 102 is pressurized and heated by an autoclave (not shown) in a state where tension is applied to the prepreg 102 by bending the prepreg 102 toward the molding surface 101a side.
There is a vacuum bag molding method for curing 05.

[0011]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
According to Japanese Patent No. 6864, the prepreg 102 is evacuated to form the prepreg 102 by evacuating the bag film 105.
01 and the curved surface 101 of the prepreg 102 in the vicinity of the tension applying device 107 is curved.
a by applying tension to a unidirectional fiber prepreg having fibers along the bending direction of the prepreg 102
Is pressed against the molding surface 101a, so that the flow of the uncured surplus resin 102c in the side surface portion 102a toward the top surface portion 102b can be suppressed to some extent.

However, the deformation of the upper die plate 103 still cannot follow the change in the reduction of the thickness of the prepreg 102 according to the curing process, and a gap is formed between the prepreg 102 and the upper die plate 103, and the upper die plate is preceded. The side portion 103a of the 103 presses the side portion 102a of the prepreg 102 to prevent the upper portion 103b of the upper die plate 103 from lowering.

As a result, under the condition that the distance between the top 103b of the upper die plate 103 and the top 102b of the prepreg 102 is not sufficiently reduced, the side surface 102a of the prepreg 102 pressed by the side 103a of the upper die plate 103 is not pressed. There is a concern that the resin in the cured state may be pushed upward to be cured, and the occurrence of unevenness in the thickness of the composite curved panel 100 may not be sufficiently avoided.

Further, since the tension applying device 107 for holding the edge of the prepreg 102 is sandwiched between the tension plate 107a having a substantially L-shaped cross section and the flat holding plate 107b, a sufficient holding force can be obtained. There is a concern that the prepreg 102 may not be provided with sufficient tension when the inside of the bag film 105 is evacuated, and there is a concern that the thickness of the composite material curved panel 100 may be uneven and wrinkles, undulations, There is a concern that the occurrence of voids and the like may be induced.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention, which has been made in view of the above points, is to provide a composite panel having a uniform thickness and which is capable of avoiding generation of wrinkles, undulations, voids, and the like, or of obtaining a high quality composite material curved panel with extremely few occurrences. An object of the present invention is to provide an apparatus and a method for forming a curved panel.

[0016]

According to a first aspect of the present invention, there is provided an apparatus for forming a curved panel made of a composite material, the method comprising: changing a direction on a curved forming surface of a forming die; A fiber prepreg is laminated, a flexible upper mold plate and a ventilation fabric are sequentially laminated on the prepreg, and further covered with a bag film from above the ventilation fabric, and the inside of the bag film is evacuated, In a molding apparatus of a composite material curved panel that presses and heats and cures a prepreg, a prepreg laminating range is set on a curved forming surface of the molding die, and the curved shape is formed on the upper mold plate. A flexible upper plate urging member extending along the bending direction of the molding surface, and a biasing member disposed on the molding surface at a position in the vicinity of the prepreg lamination range and changing the direction on the prepreg lamination range. A plurality of unidirectional fiber prepregs, a unidirectional fiber prepreg laminated along the bending direction of the molding surface, and a tension applying device for holding an end of the upper mold plate urging material. Features.

According to the first aspect of the present invention, in the curing process, the prepreg is pressed against the molding surface of the molding die by the upper die plate, and the tension is applied to the prepreg by the tension applying device, so that the uncured resin flows. Is suppressed, and furthermore, tension is applied to the upper mold plate by the tension of the upper mold plate urging material acting on the upper mold plate, and the upper mold plate deforms to follow the change in the thickness of the prepreg and deforms with the prepreg. The gap between the upper mold plate is prevented beforehand, as a result, the flow of the surplus resin in the uncured state is prevented, and the thickness is uniform, and wrinkles, undulations, voids, etc. are prevented. A high quality composite curved panel is obtained.

According to a second aspect of the present invention, in the apparatus for forming a composite material curved panel according to the first aspect, the upper plate urging members are band-shaped, and a plurality of the upper plate urging members are arranged in parallel with an interval therebetween. It is characterized by the following.

According to the second aspect of the present invention, since a plurality of upper mold plate urging members are arranged in parallel with an interval therebetween, each upper mold plate urging can be easily and uniformly and reliably performed particularly over a wide range of the curved surface of the molding surface. The tension can be applied to the upper mold plate by the material, and the effect of claim 1 is more reliably achieved.

According to a third aspect of the present invention, in the apparatus for forming a curved panel of a composite material according to the first or second aspect, the tension imparting device is provided with a unidirectional fiber prepreg laminated along a bending direction of the molding surface. A tension plate that extends in a direction substantially perpendicular to the fiber direction, is disposed on the molding surface, and has a substantially U-shaped cross section having an opening that is open outward along the extending direction; A tension bar having a substantially rectangular cross section that fits into the opening with the prepreg and the upper mold plate urging material interposed and cooperates with the opening to lock the one-way prepreg and the upper mold plate urging material. It is characterized by having.

According to the third aspect of the present invention, the tension applying device includes a tension plate having a substantially U-shaped cross section having an opening,
By restraining the one-way fiber prepreg and the upper mold urging material with the tension bar fitted to the opening, it is possible to securely hold the one-way fiber prepreg and the upper mold urging material, Tension is applied to the unidirectional fiber prepreg and the upper-type urging material, so that the operation of claim 1 is reliably achieved.

According to a fourth aspect of the present invention, in the composite curved panel forming apparatus according to the third aspect, the molding surface has a multi-curved surface shape including a plurality of curved surfaces, and the tension plate is divided into a plurality of portions. And is disposed on the molding surface.

According to the fourth aspect of the present invention, by dividing the tension plate into a plurality of parts, the tension applying device can be appropriately disposed even if the molding surface has a multi-curved surface shape including a plurality of curved surfaces.

According to a fifth aspect of the present invention, in the composite material curved panel forming apparatus of the third aspect, the forming surface has a multi-curved surface shape including a plurality of curved surfaces, and the tension plate has a curved shape. It is characterized by being provided on the molding surface.

According to the fifth aspect of the present invention, by forming the tension plate in a curved shape, the tension applying device can be appropriately disposed even if the forming surface has a multi-curved surface shape including a plurality of curved surfaces.

According to a sixth aspect of the present invention, there is provided a method of forming a curved composite material panel, wherein a plurality of unidirectional fiber prepregs are laminated on a curved forming surface of a forming die by changing the direction, and a plurality of unidirectional fiber prepregs are laminated on the prepreg. The upper mold plate having flexibility and the ventilation fabric are sequentially stacked, and further covered with a bag film from above the ventilation fabric, the inside of the bag film is evacuated, the prepreg is pressed, heated and cured. In a method of forming a composite curved panel, the composite curved panel is formed.
A prepreg laminating step of laminating a plurality of unidirectional fiber prepregs by changing a direction on a prepreg lamination range formed on a molding surface of a molding die, and a flexible material on the laminated unidirectional fiber prepreg. An upper die plate disposing step of stacking upper die plates, and disposing an upper die plate urging material on the upper die plate so as to extend along a bending direction of a molding surface, and An upper die plate urging member arranging step of fixing both the end portion and the one-way fiber prepreg in which the fibers extend along the bending direction to a tension applying device arranged close to the prepreg laminating area, A step of arranging an air-permeable fabric on the upper mold plate urging material, a step of setting a bag film for covering the air-permeable fabric with a bag film from above, and vacuuming the inside of the bag film to apply the prepreg. Under a state, characterized by comprising a cured prepreg step of curing by heating.

According to the sixth aspect of the present invention, in the curing process, the prepreg is pressed against the molding surface of the molding die by the upper mold plate, and the tension is applied to the prepreg by the tension applying device to flow the uncured resin. The upper mold plate is deformed following the change in the thickness of the prepreg by the tension acting on the upper mold plate due to the tension of the upper mold plate urging material acting on the upper mold plate. The gap generated between the plate and the plate is prevented beforehand, and the flow of the uncured surplus resin is prevented. As a result, a stable, high-quality composite material curved panel having a uniform thickness and preventing wrinkles, undulations, voids, and the like is obtained.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an apparatus and a method for forming a composite curved panel according to the present invention will be described below with reference to FIGS.

FIG. 1 shows a molding apparatus 1 according to the present embodiment.
FIG. 2 is an explanatory view showing an outline of a method of forming a composite material curved panel by the forming apparatus 10, FIG. 2 is a cross-sectional view of a main part of FIG. 1 in a forming process, and FIG.
It is a part enlarged explanatory view.

The forming apparatus 10 includes a forming die 11 having a forming surface 12 corresponding to the shape of the composite curved panel to be formed, for example, having a substantially symmetrical parabolic cross section through the top 12a. . In the vicinity of the prepreg lamination range 12b formed on the molding surface 12 and in a direction substantially orthogonal to the direction in which tension is applied to the prepreg 30 described below, that is, in the present embodiment, the prepreg lamination is performed below the prepreg lamination range 12b. A tensioning device 15 is provided which extends along each lower edge 12c of the area 12b.

The tension applying device 15 has an upper part 16a and a lower part 16b which project outward, and an upper part 16a and a lower part 16b.
b and a tension plate 16 disposed on the molding surface 12 along the lower edge 12c of the prepreg lamination area 12b and having a substantially U-shaped cross section having an opening 16c opened outward.
And a tension bar 17 having a substantially rectangular cross section which can be fitted into the opening 16c of the tension plate 16 with the edge 30a of the prepreg 30 interposed therebetween.

Next, a method for forming a composite material curved panel by the forming apparatus 10 will be described with reference to a flowchart shown in FIG.

The prepreg 30 previously impregnated with resin is overlapped on the prepreg stacking area 12a formed on the molding surface 12 of the mold 11 (prepreg stacking step S
1). The prepreg 30 to be superimposed on the molding surface 12
Is formed by laminating a plurality of so-called unidirectional fiber prepregs in which fibers arranged in one direction are impregnated with resin in advance, while changing the direction of the fibers.

The unidirectional fiber prepreg is formed by laminating a plurality of unidirectional fiber prepregs having fiber directions other than the extending direction (X direction shown in FIG. 1) along the bending direction of the top 12a of the molding surface 12. Within the range 12b,
Further, as shown in FIG. 3A, the plurality of unidirectional fiber prepregs having a fiber direction along the bending direction X have both end edges 30a at both lower edges 1a of each prepreg laminated area 12b.
2c, it is superimposed on the molding surface 12 in a state where it does not bend to a position below each tension plate 16.

In this laminating operation, the unidirectional fiber prepreg along the bending direction X is attached to the tension plate 16.
It is preferable that the tension bar 17 be repeatedly tightened and removed from the opening 16c of the tension plate 16 for each unidirectional fiber prepreg so as not to bend below.

After the lamination of the prepreg 30 is completed, the upper die plate 18 made of a thin flexible material made of, for example, rubber or a composite material is overlaid on the prepreg 30 in a range corresponding to the prepreg lamination range 12b. (Upper mold plate disposing step S2). When laminating the upper die plate 18, the upper die plate 18 is placed on the prepreg 30 by interposing a release film (not shown) on the prepreg 30 as necessary.
It is also possible to more reliably prevent the adhesion between the prepreg 30 and the upper die plate 18 by laying it on the upper side.

Further, a plurality of belt-shaped upper plate urging members 19 are arranged in parallel on the upper die plate 18 so as to extend at predetermined intervals along the bending direction X. As shown in FIG. 3A, each end 19 a of the prepreg 3 extends below the tension plate 16.
0, and furthermore, this end portion 19a is provided with a tension bar 17 inserted into the opening 16c of the tension plate 16.
Thus, the prepreg 30 is fixed to the tensioning device 15 together with the edge 30a of the prepreg 30 (upper die plate urging member disposing step S3).

The upper mold plate urging member 19 can be deformed in accordance with the shape change of the upper mold plate 18, can secure a sufficient tensile strength, and has a low thermal expansion such as carbon fiber or its prepreg material. Materials are preferred. In particular, when a prepreg material is used, it is preferable to use the prepreg material by previously covering it with a release film or the like so as not to adhere to the upper mold plate 18 or the like.

Further, a ventilation fabric 20 is placed on the upper mold plate urging material 19.
(The ventilation fabric disposing step S4), and the ventilation fabric 2
0 and covered with a bag film 21 from above,
The edge of the bag film 21 and the molding surface 12 of the molding die 11
Between the bag film 21 and the sealant 23
Keep airtight inside (bag film setting step S
5).

Further, the inside of the airtight bag film 21 is evacuated to cause the prepreg 30 to be pressed against the molding surface 12 of the mold 11 by the upper die plate 18 and to urge the upper die plate on the upper die plate 18. The prepreg 30 is cured by applying pressure and heating in an autoclave (not shown) in a state where the material 19 is in pressure contact (prepreg curing step S6).

As shown in FIG. 3B, the evacuation of the bag film 21 and the application of pressure in the autoclave can cause tension on the prepreg 30 against the molding surface 12 by the upper die plate 18. Due to the step between the top end of the upper portion 16a of the plate 16 and the molding surface 12, the lower end 18a of the upper die plate 18 and the upper
6a, tension is generated in the unidirectional fiber prepreg having fibers along the bending direction X, and the lower end 18a of the upper plate 18 of the upper plate urging member 19 and the upper portion 16a of the tension plate 16 Tension occurs in the area between them. As a result, a downward tension P3 is applied to the lower end of the prepreg 30, and the upper die plate 1 is pressed by the upper die plate urging member 19.
8, a downward tension P4 is applied.

A prepreg is formed by a tension plate 16 having a substantially U-shaped cross section with an opening 16c opening outward between an upper portion 16a and a lower portion 16b, and a tension bar 17 having a rectangular cross-sectional shape fitted into the opening 16c. 30 lower edge 3
0a and the end 19a of the upper mold plate urging member 19 are held and held, so that the prepreg 30 and the upper mold plate urging material 19 are securely held by the tension applying device 15, and the prepreg 30 and the upper mold plate 18 are held. , The tensions P3 and P4 are reliably applied.

Accordingly, as shown in FIG. 5 (a) and FIG. 5 (b) schematically showing a main part of the prepreg 30 before curing and a state during and after curing, respectively, the autoclave can is cured during the curing process. If the internal pressure is increased, in the state before curing,
As shown in FIG. 3A, the pressure P in the autoclave can acts on the prepreg 30 via the upper mold plate 18 and the lower tensions P3 and P4 act on the prepreg 30 and the upper mold plate 18, respectively.

In this curing process, the prepreg 30 is pressed against the molding surface 12 of the molding die 11 by the upper mold plate 18 and is given a tension by the tension P3 acting on the prepreg 30, so that the uncured surplus of the side portion 30b is formed. The resin is prevented from flowing in the direction of the top surface portion 30c, and the upper mold plate 1 is urged by the tension of the upper mold plate urging member 19 acting on the upper mold plate 18.
8 acts on the top surface 1 of the upper mold plate 18.
8b is pressed and urged downward by a plurality of upper mold plate urging members 19 arranged side by side at a predetermined interval, and the upper mold plate 18 is deformed to follow the change in the thickness of the prepreg 30 and changes to the prepreg 30 and the upper mold. The gap generated between the prepreg 30 and the upper mold plate 18 is maintained during and after the curing as shown in FIG. In this case, the flow of the uncured surplus resin is prevented.

Accordingly, the composite material curved panel 35 from which the prepreg 30 has been hardened and removed from the mold, as shown in the cross section in FIG.
And a stable high-quality composite material curved panel in which the generation of wrinkles, undulations, voids and the like is sufficiently avoided is obtained.

In setting the mounting position of the tension plate 16 and the shape of the tension plate 16, a gap a between the tension plate 16 and the lower edge 12c of the prepreg lamination area 12b as shown in a perspective view of a main part in FIG. If the height is too small or the height b of the tension plate 16 is too large, it becomes difficult to evacuate the bag film 21 and induce breakage of the bag film 21.
Conversely, if the gap a is too large or the height b is too small, there is a concern that the tensions P3 and P4 cannot be sufficiently generated. Therefore, in the present embodiment, when forming the composite material curved panel 35 having a thickness of 5 mm, the gap a between the prepreg lamination range 12 b and the tension plate 16 is set to 25 mm.
In consideration of the thickness of the composite material curved panel 35, the thickness of the upper mold plate 18 and the molding condition of the composite material curved panel 35, the width c of the metal tension plate 16 is set.
Is 22 mm, the height b is 12 mm, and the groove width d of the opening 18c is
Was set to 12 mm, and the depth e was set to 10 mm.

On the other hand, the closer the tension bar 17 is to a flat plate shape, the more stable it can be fitted into the opening 16c. However, if the tension P3 is large, the tension bar 17 may fall off. There is. If the opening 16c of the tension plate 16 is shallow, the tension bar 17 may come off during tension operation. Therefore, in the present embodiment, the thickness of the prepreg 30 to which the tension P3 is applied, that is, the sum of the thickness of the unidirectional fiber prepreg having fibers along the bending direction X of the molding surface 12 and the thickness of the upper plate urging member 19 In view of the fact that the thickness is 1.25 mm, by using a metal material having a rectangular cross-section having both a width f and a height g of 9 mm, a favorable composite material curved panel 35 could be formed.

The gap a between the prepreg lamination area 12b and the tension plate 16 and the dimensions of the tension plate 16 and the tension bar 17 are appropriately changed in consideration of the shape and thickness of the composite material curved panel 35 to be formed. When the molding surface 12 has a multi-curved surface shape including a plurality of curved surfaces, the tension plate 16 and the tension bar 17 may be curved or divided into a plurality of portions corresponding to the multi-curved surface shape. Can be properly arranged. According to the bolting method, the tension plate 16 is fixed to the molding die 11 by the following method.
It is necessary to drill a bolt insertion hole or the like in the tension plate 16 and the molding die 11, which may cause air leakage at the time of evacuation. As a countermeasure, when the tension plate 16 and the molding die 11 are made of metal, By welding
When the tension plate 16 and the mold 11 are made of resin, it is preferable to fix them with an adhesive.

[0049]

According to the apparatus and method for forming a curved composite material panel according to the present invention described above, the prepreg laminating range is set on the curved molding surface of the molding die, and the curved surface is formed on the upper mold plate. The bending direction of the inner molding surface of the unidirectional fiber prepreg in which a plurality of laminated unidirectional fiber prepregs are arranged by changing the direction to the prepreg laminating area by disposing a belt-shaped upper mold plate having flexibility along the bending direction of the formed molding surface. Since the unidirectional fiber prepreg laminated along and the end of the upper mold plate urging material are held by the tension applying device, in the curing process, the prepreg is pressed against the molding surface of the mold by the upper mold plate,
In addition, the tension is applied to the prepreg by the tension applying device to suppress the flow of the uncured resin, and a downward pressing force acts on the upper die due to the tension of the upper die urging material acting on the upper die. However, the upper mold plate is deformed following the decrease in the thickness of the prepreg, whereby a gap generated between the prepreg and the upper mold plate is prevented, and the flow of the uncured surplus resin is prevented. As a result, a stable, high-quality composite material curved panel having a uniform thickness and preventing wrinkles, undulations, voids, and the like is obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an outline of a forming apparatus according to an embodiment of the present invention and an outline of a forming method of a composite material curved panel.

FIG. 2 is a sectional view of a main part in a molding process.

FIG. 3 is an enlarged explanatory view of a portion A in FIG. 2, wherein (a) shows a state before curing, and (b) is an explanatory view showing a state during and after curing.

FIG. 4 is a flowchart illustrating a molding method.

FIG. 5 is an explanatory view of a curing process of a prepreg;
FIG. 3 shows a state before curing, and FIG. 4B is a cross-sectional view of a main part showing states during and after curing.

FIG. 6 is a sectional view of a principal part of a composite curved panel.

FIG. 7 is a cross-sectional explanatory perspective view of a main part of the tension applying device.

FIG. 8 is a cross-sectional view of a main part showing an outline of a conventional apparatus and method for forming a composite curved panel.

FIG. 9 is an explanatory diagram of a curing process of a prepreg;
Indicates a state before curing, (b) indicates a state during curing,
(C) is a sectional view of a main part showing a state after curing.

FIG. 10 is a sectional view of a composite curved panel formed by a conventional forming method.

FIG. 11 is a cross-sectional view of an essential part showing an outline of a conventional molding device and a molding method for a composite curved panel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Molding apparatus 11 Mold 12 Molding surface 12a Top 12b Prepreg lamination range 12c Lower edge 15 Tension imparting device 16 Tension plate 16c Opening 17 Tension bar 18 Upper mold plate 19 Upper mold plate urging material 20 Ventilation fabric 21 Bag film 30 Prepreg 30a Edge 35 Composite curved panel X Bending direction

Claims (6)

[Claims] 1. A plurality of unidirectional fiber prepregs are laminated by changing the direction on a curved forming surface of a molding die, and a flexible upper die plate and a ventilation fabric are sequentially laminated on the prepreg, Further, in a molding apparatus of a curved composite material panel, which is covered with a bag film from above the ventilation fabric, and the inside of the bag film is evacuated, and the prepreg is pressed and heated and cured, A prepreg lamination range is set on the formed molding surface, and on the upper mold plate, a flexible upper mold plate urging member having a flexibility extended along the bending direction of the curved formed molding surface, One of the unidirectional fiber prepregs arranged in the vicinity of the prepreg lamination range on the molding surface and changing the direction on the prepreg lamination range, and one of the unidirectional fiber prepregs laminated along the bending direction of the molding surface. An apparatus for forming a curved composite panel, comprising: a directional fiber prepreg; and a tension applying device for holding an end of the upper die plate urging member. 2. The apparatus for forming a curved panel of a composite material according to claim 1, wherein the biasing members of the upper die plate have a band shape, and a plurality of the biasing members are arranged in parallel with an interval therebetween. 3. The tension applying device is disposed on the molding surface so as to extend in a direction substantially orthogonal to the fiber direction of the unidirectional fiber prepreg laminated along the bending direction of the molding surface, and A tension plate having a substantially U-shaped cross section having an opening that is opened along the extending direction, and the one-way prepreg and the upper die plate urging member are fitted into the opening to interpose the opening. 3. The apparatus according to claim 1, further comprising: a tension bar having a substantially rectangular cross section for retaining the one-way prepreg and the upper die plate urging member in cooperation with the tension member. . 4. The molding surface according to claim 3, wherein the molding surface has a multi-curved surface shape including a plurality of curved surfaces, and the tension plate is divided into a plurality of portions and disposed on the molding surface. Molding equipment for composite curved panels. 5. The composite according to claim 3, wherein the molding surface has a multi-curved surface shape including a plurality of curved surfaces, and the tension plate is formed to be curved and disposed on the molding surface. Equipment for forming curved panels. 6. A plurality of unidirectional fiber prepregs are laminated by changing the direction on a curved forming surface of a molding die, and a flexible upper die plate and a ventilation fabric are sequentially laminated on the prepreg, Further, in a method of forming a composite curved panel, the cover is covered with a bag film from above the ventilation fabric, the inside of the bag film is evacuated, the prepreg is pressed, heated and cured to form a composite curved panel. A prepreg laminating step of laminating a plurality of unidirectional fiber prepregs by changing a direction on a prepreg lamination range formed on a molding surface of a mold; and a flexible material on the laminated unidirectional fiber prepreg. An upper die plate disposing step of stacking an upper die plate comprising: an upper die plate urging member disposed on the upper die plate so as to extend along a bending direction of a molding surface; and End of An upper die plate urging member arranging step of fixing both the portion and the one-way fiber prepreg in which fibers extend along the bending direction to a tension applying device arranged close to the prepreg laminating range; A step of arranging an air-permeable fabric on the template urging material, a step of setting a bag film for covering the air-permeable fabric with a bag film, and evacuating the inside of the bag film to pressurize the prepreg. And a prepreg curing step of heating and curing in a heated state.