JPH08164577A - Method for repairing sandwich panel structure - Google Patents

Abstract

PURPOSE: To reduce apparent specific gravity of a sandwich panel structure, to control costs and weight to be increased by repair, and to secure strength by making the cell of a repair part a rigid body by a resin, a metallic repair agent, and a spacer. CONSTITUTION: In a repairing method in which a resin 8 or a metallic repair agent 8' is injected into a damaged part of a sandwich panel structure, when a face plate 2 is damaged, the face plate 2 of a damaged part is hollowed out, a hollow spacer 7 is inserted into a cell 5, and the resin B or the metallic repair agent 8' is injected into the cell 5 to the full and cured to make the cell a rigid body to secure the strength.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing a sandwich panel structure, and more particularly to a method for repairing a sandwich panel structure which can easily repair a damaged portion formed on a face plate of the sandwich panel structure. is there.

[0002]

2. Description of the Related Art Conventionally, regarding the repair method of sandwich panel structure, Great Aircraft Series No.4 "Mitsubishi T-2 and
F-1 ”Aviation Journal, Inc. There is a method described in 1981, that is, a method of injecting resin into a damaged portion. in this case,
Since it is necessary to fill the inside of the cell with resin, a large amount of resin is required, which leads to an increase in cost and further increases the weight.

[0003]

In the above-mentioned prior art, there is a drawback in that a large amount of resin is required because the inside of the cell needs to be filled with the resin, resulting in cost increase and further increase in weight.

In order to solve the above problems, it is an object of the present invention to reduce the amount of resin injected into the cell.

Another object of the present invention is to provide a method of repairing a sandwich panel structure which can smooth the panel surface and prevent an extreme decrease in strength of the repaired portion.

[0006]

The above object is achieved by inserting a hollow spacer or a spacer having a specific gravity smaller than that of resin into the cell to be repaired, and greatly reducing the resin filling the cell.

The above-mentioned object is to install a repair member, whose surface is flush with the face plate, in the opening portion where the damaged portion of the face plate is removed, while being supported by a plurality of members including the face plate of the panel constituent member. Is achieved by

[0008]

[Function] By inserting a hollow spacer or a spacer smaller than the specific gravity of the resin into the cell to be repaired in the sandwich panel structure, and significantly reducing the resin filling the cell, the apparent specific gravity is reduced. Reduces the weight increase and cost caused by repairs.

Since the repair member is supported by the face plate and the core member or another face plate, the strength can be improved as compared with the case where the repair member is simply joined to the face plate for repair. It is possible to prevent an extreme decrease in strength of the part. Further, the repair material is installed so that its surface is flush with the surface of the face plate.

[0010]

Embodiments of the present invention will be described below with reference to FIGS. First, FIG. 7 shows a case where the damaged portion 3 is generated in the face plate 2 of the sandwich panel structure 1. A damaged portion 3 is generated in the face plate 2 located inside the cell 5 surrounded by the core material 4.

FIG. 1 shows an example of the repair method of the present invention. When a damaged portion 3 as shown in FIG. 7 is produced on the face plate 2, the face plate 2 of the cell 5 where the damaged portion 3 is produced is partially hollowed out in a region slightly wider than the damaged portion, and a hollow 6 is removed. Then, the hollow spacer 7 is inserted into the cell 5. The spacer 7 has a height dimension such that one end surface is in contact with the inner surface of the face plate on the opposite side of the panel, and the other end surface is visible from the opening, that is, the hollowed portion 6, and at least the surface thereof is flush with the face plate. Has been done. It is also possible to make the dimension of the spacer 7 longer than the above-mentioned length so that the end face is projected from the hollowed-out portion 6 in the inserted state, and the end face is processed to be flush with the face plate at the final stage of the work. is there.

Then, with the spacer 7 inserted in the hollow portion 6, the cell 5 is filled with the resin 8. At this time, the resin 8 is injected into the gap between the spacer 7 and the core material 4. The resin 8 hardens the cells 5 in the cured state to secure the strength. When the sandwich panel structure is made of a metal such as an aluminum alloy, the cell 5 to be repaired has a high strength (for example, a tensile strength of 7.1 kgf / mm).
² ), Metal-based repair agent 8'having a high adhesive strength, that is, a polymer-bonding metal (including macro-polymer material + steel or other metal fine particles + aluminum ultrafine particles, etc.) is filled.
However, this metal-based repair agent 8'is expensive, and in order to reduce the repair cost, the cell 5 to be repaired for the spacer 7 is
To increase the volume and reduce the filling amount of expensive repair agent.

FIG. 2 shows an AA cross section of FIG. In the sandwich panel structure 1, a core material 4 is arranged and joined between upper and lower face plates 2. Therefore, each cell 5 is a space surrounded by the face plate 2 and the core material 4.

FIG. 3 shows a BB cross section of FIG. That is, it is a cross-sectional view of the repair portion shown in FIG.
A portion of the face plate 2 including the damaged portion 3 as shown in FIG. 7 is hollowed out to form a hollowed portion 6, a spacer 7 is inserted into the cell 5 through the opening, and the spacer 7 and the core in the cell 5 are inserted. A resin 8 or a metal-based repair agent 8 ′ is injected between the material 2 and the material 2. Then, the resin 8 or the metal-based repair agent 8 ′ is filled up to the surface of the face plate 2 and then cured. The cell 5 repaired by the resin 8 or the metal-based repairing agent 8'is made rigid to secure the strength.

FIG. 4 shows an embodiment different from the embodiment shown in FIG. The damaged portion 3 generated in the face plate 2 is hollowed out to form a hollowed portion 6, a solid spacer 7'is inserted, and the face plate 2 and the solid spacer 7'are joined by welding or brazing. The illustrated structure joins the two by forming a weld 9. The solid spacer 7'is provided with an injection hole 7'a for the resin 8 or the metal-based repair agent 8'and an air vent hole 7'b. Therefore, the cell 8 is filled with the resin 8 or the metal-based repair agent 8 ′ injected through the injection hole 7′a, and the air is discharged through the air vent hole 7′b. This effect is that the repaired cell 5 is made rigid like the embodiment of FIG. 3 to secure the strength, and the required resin 8 or metal repairing agent 8 ′ is small. Furthermore, since the filling material is filled from the back side of the gap between the spacer 7 and the core material 4, air bubbles do not occur due to useless mixing of air, and problems such as strength reduction can be prevented.

FIG. 5 shows an embodiment different from the embodiment shown in FIG. The damaged portion 3 generated in the face plate 2 is hollowed out to form a hollowed portion 6, a hollow spacer 7 ″ is inserted, and the face plate 2 and the hollow spacer 7 ″ are joined by welding or brazing. The hollow spacer 7 ″ is provided with injection holes 7 ″ a and 7 ″ c for the resin 8 or the metal-based repair agent 8 ′. Therefore, the cell 8 is filled with the resin 8 or the metal-based repair agent 8 ′ injected through the injection hole 7 ″ a, and the air is discharged through the small air vent hole 7 ″ b provided in the face plate 2. This effect is that the repaired cell 5 is made rigid and the strength is secured, and the required amount of the resin 8 or the metal-based repairing agent 8'can be reduced. Furthermore, it is effective when the spacer 7 as a repair material is made of a metal material and the specific gravity of the injected resin 8 is made as small as possible to reduce the weight as much as possible. That is, by constructing the spacer 7 itself from a metal material, it is possible to secure the strength of the reinforced portion and to fill the interior of the spacer 7 with the resin 8 to achieve weight reduction.

FIG. 6 shows an embodiment different from the embodiment shown in FIG. The damaged portion 3 generated in the face plate 2 is hollowed out to form the hollowed portion 6, and the hollow spacer 7 is inserted to
The hollow spacer 7 and the hollow spacer 7 are joined 9 by welding or brazing. This effect is that the face plate 2 and the hollow spacer 7 are joined 9 by welding or brazing to rigidify the cell 5 of the repaired portion and secure the strength. Furthermore, when the sandwich panel of this embodiment constitutes an airtight structure, the airtight state can be secured by joining the spacer 7 and the face plate 2 by metal-to-metal joining.

FIG. 8 shows a case where the damaged portion 3 formed in the sandwich panel structure 1 is formed in a wide area between the cells 5.

FIG. 9 shows a repairing method for the damaged portion 3 as shown in FIG. That is, the face plate 2 of the plurality of cells 5 involved in the damaged portion 3 is hollowed out to form the hollow portion 6, and the spacer 7 is inserted into each of the cells 5. Then, as shown in FIG. 3, each cell 5 is filled with a resin 8 or a metal-based repairing agent 8 ', and then cured,
The repaired cells 5 are integrated as a group to secure the strength. At this time, the surface of the face plate 2 is repaired with the resin 8 or the metal-based repairing agent 8 ′ to secure the appearance and prevent the crack from developing in the damaged portion. Here, a case has been described in which the repairs of the respective cells 5 are grouped together and repaired by the method of the embodiment shown in FIG. 3, but the method of the other embodiments shown in FIGS. 3 to 6 is used. Is also good.

Although the hollow cylindrical container has been described as the spacer, it may be a hollow body such as a hollow sphere. Further, the solid substance of the material for the spacer may be used without being dissolved by the resin 8 or the metal-based repairing agent 8 '. A plurality of spacers may be inserted inside the repaired cell.

[0021]

According to the present invention, when repairing damage caused in a sandwich panel structure, it is possible to dispose a spacer inside the cell to be repaired and reduce the amount of resin or metallic repair agent injected into the cell. Therefore, it is possible to suppress an increase in cost and weight for repairing, and to secure the strength of the repaired portion.

Further, according to the present invention, the repaired portion can be smoothed and the extreme reduction in strength can be prevented.

[Brief description of drawings]

FIG. 1 is a plan view of a sandwich panel structure to which an embodiment of a repair method according to the present invention is applied.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a sectional view taken along line BB in FIG.

FIG. 4 is a sectional view of a repair portion of a sandwich panel structure to which a repair method according to another embodiment of the present invention is applied.

FIG. 5 is a sectional view of a repaired portion of a sandwich panel structure to which a repairing method according to still another embodiment of the present invention is applied.

FIG. 6 is a sectional view of a repaired portion of a sandwich panel structure to which a repairing method according to still another embodiment of the present invention is applied.

FIG. 7 is a plan view showing an example of a damaged sandwich panel structure.

FIG. 8 is a plan view showing an example of a damaged sandwich panel structure.

9 is a plan view of the sandwich panel structure in which the repair method of the present invention is applied to the panel of FIG.

[Explanation of Codes] 1 ... Sandwich panel structure, 2 ... Face plate, 3
... Damaged parts, 4 ... Core material, 5 ... Cell, 7 ...
-Spacer, 8 ... Resin, 8 '... Metal-based repair agent.

Front page continued (72) Inventor Sadao Shibakita 794 Azuma Higashitoyo, Shimomatsu, Yamaguchi Prefecture Inside the Kasado Plant, Hitachi, Ltd. Kasado Factory

Claims (2)

[Claims] 1. A method for repairing a sandwich panel structure, wherein at least a cell face plate at a damaged portion is hollowed out, a spacer is inserted into a cell surrounded by a core material, and a space between the spacer and the cell material is hardened. A method for repairing a sandwich panel structure, which comprises injecting a repairing agent. 2. A method for repairing a sandwich panel structure in which a core material is arranged between a pair of face plates and joined together, and an opening is formed in the face plate including a damaged portion of the face plate,
A repair method for a sandwich panel structure, characterized in that a repair member flush with the face plate is inserted into the opening through the opening, and the repair member is arranged in contact with a plurality of members constituting a panel. .