JPH06190957A - Honeycomb sandwich panel and production thereof - Google Patents

Abstract

PURPOSE:To prevent the lowering of durability caused by the deficiency of a resin and to enhance the adhesion of a honeycomb core member to surface plates by effectively preventing the penetration of the resin of the surface plates into the honeycomb core member composed of a porous core material. CONSTITUTION:Rubber layers 3 composed of a high mol. wt. rubbery material are provided to both surfaces of a honeycomb core member 2 obtained by forming a porous core material into a honeycomb shape along the opening end surfaces of honeycomb holes 2a and surface plates 4 composed of fiber reinforced plastic are integrally provided on the rubber layers 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a honeycomb sandwich panel and a method for manufacturing the same, and more particularly to a honeycomb sandwich panel having excellent adhesion between a honeycomb core body and a surface plate and a method for manufacturing the same.

[0002]

2. Description of the Related Art A honeycomb sandwich panel has a structure in which surface plates are integrally provided on both sides of a honeycomb core body formed in a honeycomb shape on the side of the honeycomb hole opening so as to close the honeycomb hole opening. . In general, the surface plate is made of fiber reinforced plastic, and when the honeycomb core body is formed by using aluminum or balsa material as a core material, it is attached to the honeycomb core body through a film adhesive layer. There is.

However, in a honeycomb sandwich panel using a porous core material such as a balsa material, the resin of the prepreg permeates the honeycomb core body together with the adhesive at the time of heating and curing, and there is a portion where the resin is insufficient in the surface plate. However, there is a problem that the durability is lowered. Further, since the resin of the adhesive also penetrates into the honeycomb core body, there is a problem that the adhesive strength between the honeycomb core body and the surface plate is lowered.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to effectively prevent resin of a surface plate from penetrating into a honeycomb core body made of a porous core material, and thus durability due to lack of resin. It is an object of the present invention to provide a honeycomb sandwich panel and a method for manufacturing the same, in which the deterioration of the honeycomb core body is prevented and the adhesion between the honeycomb core body and the surface plate is improved.

[0005]

A honeycomb sandwich panel of the present invention that achieves the above object is a honeycomb core body formed by forming a porous core material into a honeycomb shape,
The gist of the present invention is that a rubber layer made of a rubber material having a high molecular weight is provided along the end face of the opening of the honeycomb hole, and a surface plate made of fiber reinforced plastic is provided on the rubber layer to be integrally configured.

Further, in the manufacturing method of the present invention, a porous core material is formed into a honeycomb shape to form a honeycomb core body, and a high molecular weight rubber material is formed along the end faces of the honeycomb hole openings on both sides of the honeycomb core body. Is applied, the rubber-based material is cured to form a rubber layer, and a prepreg is laminated on the rubber layer, and then heat-formed to integrally form.

[0007]

The present invention is configured as described above, and by providing the rubber layer made of the high molecular weight rubber material, the resin of the prepreg permeates into the honeycomb core body made of the porous core material during heat curing. It is possible to effectively prevent the resin from being sucked into the honeycomb core body.

[0008]

1 and 2 show a honeycomb sandwich panel of the present invention. This honeycomb sandwich panel 1 is arranged along the opening end faces of the honeycomb holes 2a on both sides of a honeycomb core body 2 formed in a honeycomb shape. The surface plate 4 is integrally provided so as to close the opening of the honeycomb hole 2a via the rubber layer 3.

The honeycomb core body 2 is composed of a porous core material that permeates the resin of the surface plate 4, and for example, a balsa material or a urethane foam material is used. The rubber layer 3 is made of a high-viscosity, high-molecular-weight rubber-based material, and has a good adhesiveness to the resin of the surface plate 4 described later and a good affinity. For example, NBR, CTBN, A
There are TBN, etc.

The surface plate 4 is made of fiber reinforced plastic. The resin used for the surface plate 4 is similar to the conventional one and is not particularly limited, and examples thereof include epoxy resin, polyester resin, and phenol resin. Further, as the reinforcing material embedded in this resin, glass fiber, carbon fiber, aramid fiber or the like in a cross shape can be used as in the conventional case.

The above-mentioned honeycomb sandwich panel 1
Can be manufactured as shown in FIG. Figure 3
A high molecular weight rubber-based material is applied along the honeycomb hole opening end faces on both sides of the honeycomb core body 2 shown in (a), and then the rubber-based material is dried and cured to form the rubber layer 3 (FIG. 3).
(B)). Then, the prepreg 4a is laminated on the rubber layer 3 (FIG. 3 (c)), and the prepreg 4a is cured by heating and pressurizing while degassing in a vacuum. At this time, the dried and cured rubber layer 3 can effectively prevent the resin of the prepreg 4a from penetrating into the honeycomb core body 1.
Then, after heat curing for a predetermined time, the honeycomb sandwich panel 1 of the present invention can be obtained.

As described above, the present invention is made of a high molecular weight rubber material provided along the opening end faces of the honeycomb holes 2a on both sides of the honeycomb core body 2 formed by forming a porous core material into a honeycomb shape. Since the surface plate 4 made of fiber reinforced plastic is provided through the rubber layer 3 to integrally configure the surface plate 4,
The rubber layer 3 can effectively prevent the resin of the prepreg 4a from being sucked into the porous honeycomb core body 2 during heat curing.

Next, the adhesive strength test performed on the honeycomb sandwich panel of the present invention and the conventional example will be described. Using a balsa material as the core material, a honeycomb shape 12
A honeycomb core body having a plate thickness of mm is formed, and a rubber material made of NBR is applied to the end faces of the honeycomb hole on both sides of the honeycomb core body and dried to form a rubber layer having a thickness of 0.1 to 0.3 mm. did. Then, prepreg impregnated with epoxy resin on glass fiber cloth is laminated on both sides of each of the three rubber layers, and degassed to 400 to 700 mmHg in a vacuum bag under reduced pressure at a temperature of 130 ° C. and a pressure of 3 kgf / cm ² for 90 minutes. ,
It was heated and pressed in an oven to obtain a honeycomb sandwich panel of the present invention having a surface layer having a thickness of 0.75 mm.

Further, in the above-mentioned honeycomb sandwich panel, a conventional honeycomb sandwich panel was obtained by interposing a film adhesive layer having a thickness of 0.5 mm made of epoxy resin instead of the rubber layer. These honeycomb sandwich panels were subjected to an adhesive strength test under the conditions shown below. Adhesive strength test A honeycomb sandwich panel of 50 mm in length and width is placed between aluminum blocks, one of which is fixed and the other is movable. Then, a load (pulling in a direction away from one block) was applied to the other block, and the adhesive strength between the surface plate and the core body was measured.

The results are shown in Table 1.

[Table 1] As is clear from Table 1, the honeycomb sandwich panel of the present invention has a significantly improved adhesive strength as compared with the conventional one. The surface plate of the honeycomb sandwich panel of the present invention was also good with no bubbles remaining due to lack of resin.

[0016]

As described above, the honeycomb sandwich panel of the present invention has a high molecular weight between a honeycomb core body formed by forming a porous core material into a honeycomb shape and a surface plate made of fiber reinforced plastic. Since the rubber layer made of a rubber material is provided, it is possible to effectively prevent the resin of the prepreg forming the surface plate from penetrating into the honeycomb core body during heat curing. Therefore, it is possible to prevent a decrease in durability due to a resin shortage and to improve the adhesive strength between the honeycomb core body and the surface plate.

Further, since the rubber layers are provided along the end faces of the opening of the honeycomb holes on both sides of the honeycomb core body, it is possible to reduce the weight as compared with the conventional one using a film-like adhesive and to reduce the manufacturing cost. It can also be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a honeycomb sandwich panel of the present invention.

FIG. 2 is a partial cross-sectional view of the honeycomb sandwich panel of the present invention.

FIG. 3 is an explanatory view showing a method for manufacturing a honeycomb sandwich panel of the present invention.

[Explanation of symbols]

 1 Honeycomb Sandwich Panel 2 Honeycomb Core 2a Honeycomb Hole 3 Rubber Layer 4 Surface Plate 4a Prepreg

Claims (2)

[Claims] 1. A rubber layer made of a high molecular weight rubber-based material is provided on both sides of a honeycomb core body formed by forming a porous core material into a honeycomb shape, and on the rubber layer A honeycomb sandwich panel that is integrally configured by providing a surface plate made of fiber reinforced plastic on the. 2. A honeycomb core body is formed by forming a porous core material into a honeycomb shape, and a high molecular weight rubber-based material is applied along the end faces of the honeycomb hole openings on both sides of the honeycomb core body. A method for manufacturing a honeycomb sandwich panel, in which a material is cured to form a rubber layer, a prepreg is laminated on the rubber layer, and then heat molding is performed to integrally form the rubber layer.