JPH04347634A - Manufacture of sandwich panel - Google Patents

Abstract

PURPOSE:To manufacture a sandwich panel having sufficient shearing strength by mounting a cushioning material between a core material and the core material or another structure member and joining the core material and the structure member. CONSTITUTION:A material obtained by folding a honeycomb laminated material having the same quality of material as core materials 1, 2 in the rectangular direction to the ribbon direction is installed between both core materials 1, 2 as a cushioning material 4. Sections among the cushioning material 4 and both core maerials 1, 2 are filled with foam adhesives 5. Sections near the bonding sections of the core materials 1, 2 or the wholes of the core materials 1, 2 are heated for curing foam adhesives 5. The foam adhesives 5 are foamed through heating, the clearances of the end sections of the honeycomb materials are buried with the adhesives 5, and the adhesives are cured at 120-180 deg.C and both core materials 1, 2 are joined. Accordingly, no crack is generated in joining sections, and strength, particularly shearing strength can be ensured in the same manner as core sections.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention of this application relates to a method of manufacturing a sandwich panel consisting of a core and a face plate used for structural members of aircraft, spacecraft, etc. More specifically, the invention of this application provides a method for manufacturing a sandwich panel in which a core material is bonded to a core material and other structural members and sandwiched between face plates. The present invention relates to a method of manufacturing by joining.

0002

2. Description of the Related Art Sandwich panels are generally manufactured by sandwiching a core made of a laminate such as a honeycomb between face materials. When manufacturing small sandwich panels,
It is sufficient to use an integrated core material, but when manufacturing large-sized panels, small-sized core materials may be joined together.
You may have to use this. Furthermore, when a sandwich panel is fitted into a separately prepared structural material, a channel for connecting the sandwich panel and this structural material may have to be joined to the core material.

Conventionally, when manufacturing a sandwich panel by bonding core materials together, for example, as shown in FIG. The materials 101 and 102 are sandwiched through an adhesive 106, and then heated to foam and harden the foam adhesive 105 and harden the adhesive 106. There is a number).

0004

[Problems to be Solved by the Invention] However, after heating, the face plate 103 and the core material 10 are
1 and 102 undergo heat shrinkage, but in the above-mentioned conventional technology, the amount of expansion of the foamed adhesive 105 is small, so it may not be possible to follow the amount of shrinkage. In such a case, the cured foam adhesive 105 is applied to both bonded core materials 101, 10.
2. There was a problem in that the sandwich panel was stretched and cracked, impairing its functionality.

[0005] The purpose of the invention of this application is to solve the above-mentioned problems by providing a manufacturing method in which cracks do not occur at the joints of core materials when joining core materials in the manufacture of large-sized sandwich panels, etc. The purpose of the present invention is to provide a sound sandwich panel having sufficient strength, especially shear strength.

[0006]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the invention of this application provides a method for manufacturing a sandwich panel by sandwiching a core between face plates, in which a core material 1, a core material and other structural members 2, and A cushion material 4 is provided between the core material 1 and the cushion material 4, and an adhesive 5 is filled between the core material 1 and the cushion material 4 and between the cushion material 4 and the structural material 2 to form a core. is sandwiched between face plates 3 through an adhesive 6, and the adhesives 5 and 6 are heated and cured to join the core material 1 and the structural member 2.

[0007] Furthermore, in the above method for manufacturing a sandwich panel, both the core material 1 and the cushion material 4 are made of honeycomb laminated materials.

[0008]

[Operation] When the core material, structural members, face plate, etc. are heated and then cooled, they will thermally shrink. At this time, the cushioning material acts to absorb the amount of shrinkage. In other words, the cushioning material expands and
It stretches to prevent excessive tensile loads from being applied to the adhesive and prevent cracking of the joint.

[0009]

Embodiments An embodiment of the invention of this application will be explained based on FIGS. 1 to 3. FIG. 1 shows a basic embodiment in which core materials 1 and 2 are joined together. In this example, core material 1,
A honeycomb laminated material consisting of hexagonal cells was used for 2.
The core materials of the body are joined at their sides, and the ends of the honeycomb are sandwiched between two face plates 3. In addition, the core material 1 is as follows:
In addition to the honeycomb laminated materials illustrated here, corrugated bodies, uneven plates,
There are various laminated materials such as air chamber forming bodies. In addition to the core material 2 exemplified here, the structural members to be joined to the core material 1 include channels for joining with other structural materials.

In the manufacturing method of this embodiment, first, the core material 1 is placed between the core materials 1 and 2 as the cushion material 4.
A honeycomb laminated material made of the same material as , 2 is folded in a direction perpendicular to the ribbon direction (direction a in FIG. 2). As will be described later, this cushion material 4 absorbs heat shrinkage during adhesion, and at the same time constitutes the sandwich panel, so it is expandable and extensible and has a certain degree of strength (shear strength and rigidity). It is necessary to have one. Therefore, when the core material is a honeycomb laminate material, it is most desirable to use a honeycomb laminate material made of the same material as the core material.

Next, the cushion material 4 and both core materials 1 and 2
A foam adhesive 5 is filled in between. At this point, the foam adhesive 5 has not yet hardened and the core materials 1 and 2 have not been bonded. When the foaming adhesive 5 is foamed in a heating process to be described later, it can fill the notches on the side surfaces of the honeycomb of the core materials 1, 2 and the cushion material 4, thereby firmly adhering them. For example, an epoxy foam adhesive is used as the foam adhesive 5 . The core constructed as described above is sandwiched between face plates 3 through an adhesive, for example, an epoxy film adhesive 6.

Next, in order to cure the foam adhesive 5,
Near the adhesive part of core materials 1 and 2, or near the adhesive part of core materials 1 and 2,
2 Heat the whole thing. The foam adhesive 5 foams when heated, fills the gap at the end of the honeycomb core material, and
Both core materials 1 and 2 are bonded together by curing at 180°C.

[0013] Cross section of the joint under heating (Fig.
FIG. 2 shows a cross section of the joint after cooling (corresponding to the AA cross section of FIG. 1). FIG. 3 shows a cross section of the joint after cooling. When heated, the cushioning material 4 remains folded, but after cooling, the surrounding core materials 1 and 2 contract.
The cores 1 and 2 absorb the shrinkage of the material.

[0014]

[Effects of the Invention] The invention of this application has the following effects because it is constructed as described above. First, since the cushioning material is provided between the core material and the structural member to be joined, cracks do not occur at the joint after heating and curing, making it possible to manufacture a sandwich panel with sufficient strength, especially shear strength.

In particular, when the cushioning material is made of a honeycomb laminated material having the same quality as the core material, the cushioning material can be easily expanded and expanded, and the shear strength of the joint can be ensured similarly to that of the core. .

[Brief explanation of drawings]

FIG. 1 is a diagram showing a basic embodiment of the present invention, and is a sectional view of a sandwich panel after manufacturing.

FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, showing the state of the joint portion during heating.

FIG. 3 is a cross-sectional view taken along line AA in FIG. 1, showing the state of the joint after cooling.

FIG. 4 is a sectional view of a sandwich panel according to a conventional manufacturing method.

[Explanation of symbols]

1 Core material 2 Core material 3　　　　Face plate 4 Cushion material 5 Foam adhesive 6 Film adhesive

Claims (2)

[Claims] 1. A method of manufacturing a sandwich panel by sandwiching a core between face plates, in which a cushioning material is provided between a core material and other structural members, and between the core material and the cushioning material, and the An adhesive is filled between the cushion material and the structural member to form a core, the core is sandwiched between face plates via the adhesive, and the adhesive is heated and cured to bond the core material and the structural member. A method for manufacturing a sandwich panel characterized by joining. 2. The method of manufacturing a sandwich panel according to claim 1, wherein the core material and the cushion material are both honeycomb laminate materials.