JPH06339997A - Production of fiber reinforced plastic panel used with three-dimensional fabric - Google Patents

Abstract

PURPOSE:To provide a method for producing a fiber reinforced plastics panel used with three-dimensional fabric wherein the fiber reinforced plastics panel of uniform thickness is easily molded and as a result, the fiber reinforced plastics panel having uniform strength is produced. CONSTITUTION:The upper and rear surfaces Wa of three-dimensional fabric W impregnated with resin are semicured and thereafter set in an airtight chamber 13 placed between the upper and lower plates 2a, 2b. Internal pressure is exerted to the airtight chamber 13 and the upper and rear surfaces Wa of three-dimensional fabric W are allowed to closely adhere to the upper and lower molding plates 2a, 2b. The intermediate fiber layer Wx is vertically erected by relatively sliding the surface layer Wa in the horizontal direction while gradually extending the intervals of the upper and rear surfaces Wa of the three-dimensional fabric W. Furthermore, resin is molded and cured in a state of uniform thickness while keeping a state wherein the intermediate fiber layer Wx is erected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a fiber-reinforced plastic panel using a three-dimensional fabric, and more specifically, to raise an intermediate fiber layer of a three-dimensional fabric impregnated with a resin to form a uniform thickness. The present invention relates to a method for producing a fiber-reinforced plastic panel using a three-dimensional fabric for producing a fiber-reinforced plastic panel.

[0002]

2. Description of the Related Art Conventionally, as a method for producing a fiber-reinforced plastic panel using a three-dimensional fabric, a method of utilizing the resilience of the three-dimensional fabric itself and allowing the resin to be impregnated and left horizontally to form and cure is generally used. Is.

[0003]

However, in the case of the above-mentioned method of leaving it in the natural state, all the yarns in the longitudinal direction of the three-dimensional fabric having a certain area stand vertically and have a uniform height ( It is difficult to adjust the thickness, and therefore, there is a problem that uniform strength cannot be obtained when a fiber-reinforced plastic panel using such a three-dimensional fabric is manufactured. Further, it has been impossible to form a curved surface having a uniform height by the conventional method.

The present invention has been made in view of the above-mentioned conventional problems, and facilitates a fiber-reinforced plastic panel having a uniform thickness by erecting an intermediate fiber layer of a three-dimensional fabric impregnated with a resin. It is an object of the present invention to provide a method for producing a fiber-reinforced plastic panel using a three-dimensional woven fabric, which can be molded, and as a result, a fiber-reinforced plastic panel having uniform strength can be produced.

[0005]

In order to achieve the above object, the present invention provides a step of impregnating a three-dimensional woven fabric with a resin and gradually opening a space between upper and lower surface layers of the three-dimensional woven fabric,
Further, the gist of the invention is that it comprises a step of vertically shifting the surface layer relatively to make the intermediate fiber layer stand, and a step of curing the resin while keeping the intermediate fiber layer standing.

In addition, the step of raising the intermediate fiber layer comprises
With the surface layer of the three-dimensional fabric impregnated with the resin in close contact with the inner surfaces of the airtight upper and lower plates of the molding machine, the upper and lower plates are relatively displaced horizontally while opening a gap. As a method for further adhering the surface layer of the three-dimensional fabric impregnated with the resin to the inner surfaces of the upper and lower plates, the surface layer of the three-dimensional fabric is semi-cured,
This is a method that utilizes the pressure difference between the airtight chamber between the upper and lower plates and the outside.

[0007]

The present invention is constructed as described above, and the upper and lower surfaces of the three-dimensional woven fabric impregnated with resin are relatively shifted in the horizontal direction so that the intermediate fiber layer (warp layer) stands vertically and cured. By doing so, a fiber-reinforced plastic panel having a uniform height (thickness) can be obtained, and as a result, a fiber-reinforced plastic panel having uniform strength can be obtained.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a side view of a molding apparatus for manufacturing a fiber reinforced plastic panel 1 using a three-dimensional fabric according to the present invention, and 2a is a heating plate 3 on the surface.
Is a lower plate having a heating plate 3 on its surface, and upper and lower plates 2a, 2b
The side surface of is connected swingably via a pin 4 and links 5a and 5b that form a parallel link mechanism.

As shown in FIGS. 2 and 3, an annular groove 7 into which a rod-shaped sealing material 6 such as a rubber packing is fitted is formed near the outer peripheral edges of the upper and lower plates 2a and 2b. A contact surface 8 with which the upper and lower surfaces Wa of the three-dimensional fabric W contact is formed inside the groove 7. The contact surface 8
There are a plurality of air-bleeding grooves 9 formed in a grid pattern on the surface of the air-release groove 9. The air-bleeding grooves 9 are opened to the atmosphere through air supply / discharge passages 10a, 10b formed in the upper and lower plates 2a, 2b. 11 and the pressurized air supply port 12 are connected.

In the above embodiment, the upper and lower plates 2
In order to make the intermediate fiber layer Wx of the three-dimensional fabric W stand up by applying a predetermined pressure to the airtight chamber 13 containing the three-dimensional fabric W partitioned by a and 2b and the sealing material 6. The air opening 11 and the pressurizing air supply port 12 are used for the connection with the air supply / discharge passages 10a and 10b, but when a negative pressure is applied to the airtight chamber 13, the air pressure shown in FIG.
As shown in FIG.
As 1a, it is also possible to make the intermediate fiber layer Wx of the three-dimensional fabric W stand upright.

Next, a first embodiment of a method of manufacturing the fiber reinforced plastic panel 1 using the three-dimensional fabric W will be described with reference to FIGS. First, as shown in FIG. 5, a three-dimensional woven fabric W having a thickness of about 1.8 mm to 30 mm and a width of about 1300 mm in which the intermediate fiber layer Wx is inclined is synthesized with a phenol resin, a polyester resin, an epoxy resin, or the like. Impregnate with resin.

Next, after the upper and lower surfaces Wa of the three-dimensional fabric W impregnated with this resin are heated or brought into a semi-cured state in a natural state, they are cut to a size slightly larger than the outer edge dimension of the air vent groove 9,
As shown in FIG. 6, it is set in an airtight chamber 13 defined by upper and lower plates 2a and 2b and a sealing material 6. Subsequently, this molding apparatus is set on a pressure device such as a press (not shown) and pressed until the dimension between the upper and lower molding plates 2a and 2b reaches a predetermined value, for example, 50 to 70% of the designed thickness. In this state, a pressurizing drive source (not shown) is connected to the pressurizing air supply port 12 so that 0.05 to 0.
Air or gas having a pressure of 5 Kgf / cm ² is fed to apply an internal pressure to bring the upper and lower surfaces Wa of the three-dimensional fabric W into close contact with the upper and lower molding plates 2a and 2b, respectively.

Then, by expanding the pressurizing device to a predetermined size, as shown in FIG. 7, the upper and lower surface layers Wa of the three-dimensional fabric W are opened little by little and the surface layer Wa is kept horizontal. The intermediate fiber layer Wx is relatively displaced in the direction.
8 is erected vertically, and while maintaining the state in which the intermediate fiber layer Wx is erected, the resin is molded and cured with a uniform thickness as shown in FIG. 8, and the molded and cured three-dimensional fabric W is sealed in an airtight chamber. It is taken out from inside 13 and the molding operation is completed.

As for the method of curing this resin, when a thermosetting resin is used, it is heated by the heating plate 3, and in the case of a room temperature curable resin, it is naturally cured by leaving it to stand. To do. Further, as another method of manufacturing the fiber-reinforced plastic panel 1 using the three-dimensional fabric W, the molding plates 2a and 2b of the molding apparatus described in FIG. 4 are used, and the same method as in the first embodiment is used. After the upper and lower surfaces Wa of the three-dimensional fabric W are semi-cured and set in the airtight chamber 13 partitioned by the upper and lower plates 2a and 2b, a suction drive source (vacuum device) (not shown) is connected to the vacuum port 11a to connect the airtight chamber. Thirteen
By creating a pressure difference between the internal pressure and the external pressure of the molding apparatus, the upper and lower surfaces Wa of the three-dimensional fabric W are brought into close contact with the upper and lower molding plates 2a and 2b, respectively.

Then, in the same manner as in the above method, by expanding the pressurizing device to a predetermined size, as shown in FIG. 7, while gradually opening the upper and lower surface layers Wa of the three-dimensional fabric W, In addition, the surface layer Wa is relatively displaced in the horizontal direction to vertically erect the intermediate fiber layer Wx, and the intermediate fiber layer Wx is kept upright while maintaining a uniform thickness as shown in FIG. Then, the resin is molded and hardened, and the three-dimensional woven fabric W is taken out from between the molding plates 2a and 2b of the molding apparatus, and the molding operation is completed.

In the above embodiment, the pressure difference between the pressure inside the airtight chamber 13 and the pressure outside the molding apparatus is generated so that the upper and lower surfaces Wa of the three-dimensional fabric W are respectively formed on the upper and lower molding plates 2.
Although it is a method of closely contacting with a and 2b and molding, as another manufacturing method, the molding plates 2a and 2b of the molding apparatus are not used unlike the first and second embodiments.
As shown in FIG. 9, after the upper and lower surfaces Wa of the three-dimensional fabric W are semi-cured, at least one end of the upper and lower faces Wa of the three-dimensional fabric W is fixed by a fixing means 14a such as a pin, and then the other. The end portion of the surface is fixed by the horizontally movable fixing means 14b and moved in the horizontal direction to keep the intermediate fiber layer Wx standing vertically, and the resin is molded in such a state. It is also possible to manufacture the fiber-reinforced plastic panel 1 having a uniform thickness by curing.

By the method of each of the embodiments described above, the intermediate fiber layer Wx, which is the warp of the three-dimensional woven fabric W, is erected vertically to form the fiber-reinforced plastic panel 1 having a uniform thickness, thereby improving the strength of the panel. Is uniformed, the strength is improved, and the fiber-reinforced plastic panel 1 having a smooth surface can be manufactured.

[0018]

As described above, the present invention comprises a step of impregnating a three-dimensional fabric with a resin as described above, and a step of slightly opening a space between the upper and lower surface layers of the three-dimensional fabric while the surface layers are relatively arranged in the horizontal direction. The intermediate fiber layer is staggered to stand up and the resin is cured while keeping the standing state of the intermediate fiber layer.Therefore, the intermediate fiber layer of the three-dimensional fabric impregnated with the resin is stood upright and uniform. A fiber reinforced plastic panel with a thickness can be easily molded, and as a result, a fiber reinforced plastic panel having uniform strength can be manufactured, and
There is an effect that a fiber-reinforced plastic panel having a smooth surface can be efficiently manufactured.

[Brief description of drawings]

FIG. 1 is a side view of upper and lower molding plates of a molding apparatus embodying the present invention.

FIG. 2 is a perspective view of the back surface side of the molding plate.

FIG. 3 is a vertical cross-sectional side view of upper and lower molding plates during molding of a three-dimensional fabric.

FIG. 4 is a vertical cross-sectional side view of upper and lower molding plates showing another embodiment of the present invention.

FIG. 5 is a side view showing a step of impregnating a three-dimensional fabric with a resin.

FIG. 6 is a cross-sectional view showing a state in which a three-dimensional fabric impregnated with resin is set between upper and lower molding plates of a molding device.

FIG. 7: After the resin-impregnated three-dimensional fabric is set between the upper and lower molding plates, the three-dimensional fabric is compressed, and then pressurized air is supplied to the airtight chamber to move the upper and lower surfaces of the three-dimensional fabric up and down respectively. It is explanatory drawing which shows the process of making it closely_contact | adhere to the shaping | molding plate.

FIG. 8 is a side view of the three-dimensional woven fabric after molding.

FIG. 9 is an explanatory view showing another method for manufacturing a fiber-reinforced plastic panel using a three-dimensional fabric.

[Explanation of symbols]

1 Fiber Reinforced Plastic Panel 2a Upper Plate 2b Lower Plate 3 Heating Plate 4 Pins 5a, 5b Link 6 Sealing Material 7 Recessed Groove 8 Contact Surface 9 Air Venting Grooves 10a, 10b Air Supply / Exhaust Passage 11 Atmosphere Release Port 12 Pressurized Air Supply Port 13 Airtight chamber W Three-dimensional woven fabric Wa Upper and lower surfaces of three-dimensional woven fabric Wx Intermediate fiber layer 11a Vacuum port 14a, 14b Fixing means

Claims (3)

[Claims] 1. A step of impregnating a three-dimensional woven fabric with a resin, and while slightly opening a space between upper and lower surface layers of the three-dimensional woven fabric, and relatively shifting the surface layers in a horizontal direction to stand an intermediate fiber layer. A method of manufacturing a fiber-reinforced plastic panel using a three-dimensional woven fabric, which comprises a step of curing a resin while keeping an intermediate fiber layer standing. 2. The step of raising the intermediate fiber layer, in which the surface layer of the resin-impregnated three-dimensional fabric is brought into close contact with the inner surfaces of the airtight upper plate and lower plate of the molding apparatus, the upper plate. The method for producing a fiber-reinforced plastic panel using a three-dimensional woven fabric according to claim 1, which is a method of horizontally shifting the lower plate and the lower plate relative to each other with a gap therebetween. 3. A method of bringing the surface layer of the three-dimensional fabric impregnated with the resin into close contact with the inner surfaces of the upper and lower plates, by semi-curing the surface layer of the three-dimensional fabric and applying pressure to the airtight chamber between the upper and lower plates and the outside. The method for producing a fiber-reinforced plastic panel using the three-dimensional woven fabric according to claim 2, which is performed by utilizing the difference.