JPH11348154A - Honeycomb sandwich panel with insert and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To considerably reduce an amount of a filter to be used and a time required for manufacturing, and reduce manufacturing costs. SOLUTION: A honeycomb core 11, skins 13 and 14 adhered to both surfaces, and an insert 15 fixed to a fitting hole are provided. The insert 15 has flange parts 15A and 15B on both ends of an axial direction. One of the flange parts 15A is inserted to the fitting hole and thereafter axially rotated so as to be a shape preventing coming off from the fitting hole, and the other flange part 15B is a shape facing a periphery of the fitting hole regardless of the axial rotating. An equipment-mounting surface 15B1 which has a height flush with the skin 13 and a stepped surface 15B3 which has a depth corresponding to a thickness of an adhering layer 12 with respect to the equipment-mounting surface 15B1 are formed on the other flange part 15B.

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 with an insert used as a structure of an aircraft or an artificial satellite and a method of manufacturing the same.

[0002]

2. Description of the Related Art As a member used as a structure of an artificial satellite orbiting the earth orbit, there is a honeycomb panel in which an aluminum core is adhered to an aluminum core.
This honeycomb panel is lightweight, and is excellent in sunlight reflection, heat transfer, and electrical conductivity. In artificial satellites, honeycomb panels with inserts are constructed by embedding inserts with female threads in honeycomb panels and fixing them with fillers such as resin, and various mounting devices are fastened to the inserts. To be attached.

[0003] In artificial satellites, thermal control is an important issue. That is, the heat generated in the device is transmitted from the device to the heat transfer device incorporated in the structure of the artificial satellite via the bolt or the insert or the honeycomb skin in contact with the device, and is radiated to outer space. As described above, when heat is transmitted from the device to the honeycomb skin, the size of the contact area has a great effect, and therefore, a honeycomb panel including an insert is required to have high precision flatness. Also in terms of electrical conductivity, it is important to secure a contact area between the device and the panel core in terms of grounding the device. That is, if the conductivity is poor, a locally high potential is generated, which sparks and causes a failure of the device.

Accordingly, there are the following methods for embedding the insert into the honeycomb panel used for ensuring the flatness between the insert and the skin of the honeycomb panel. In other words, after drilling the insert mounting hole in the honeycomb panel, and after removing the core portion cut off by drilling, the insert mounted in the insert mounting hole using adhesive tape is flush with the honeycomb skin. The insert is fixed, the filler is injected into the insert mounting hole to adjust the flatness, and then the insert is fixed by curing (for example, Japanese Patent Publication No. 63-34).
825). Further, in order to prevent the filler from being heavy when the filler is injected into the insert mounting hole, the insert is flange-bonded to the surface of the honeycomb core (for example, a special opening / closing 4-27064).
No. 2, JP-A-6-126869) or a configuration in which a part of a honeycomb core is crushed to provide a pedestal for installing an insert to narrow the injection range of a filler (for example, JP-A-5-116267). Further, there has been proposed a configuration in which an inner skin is provided inside (in the middle of) the honeycomb core to form a mounting base for the insert, thereby narrowing the injection range of the filler (for example, JP-A-3-49940). I have. Further, as described above, in order to ensure the flatness of the honeycomb panel, when the insert is fixed with the filler, the amount of sinking from the skin on both surfaces of the honeycomb core is measured, and the amount of sinking of the insert is made uniform. Such a configuration (for example, Japanese Patent Application Laid-Open No. 3-272310 and Japanese Patent Application Laid-Open No. 2-195005) has been proposed.

[0005]

However, the structure for providing the above-mentioned conventional insert has the following problems. First, the conventional insert needs to fix a wide area between the honeycomb core and the skin with a filler, which increases the weight of the honeycomb panel. For example, a satellite honeycomb panel (approximately 46 kg) of about 4 m × 1 m × 1 int requires about 400 device mounting inserts (filler weight; about 5 kg).

In the conventional insert, as shown in FIG. 3, since the device mounting boss portion A1 provided on the insert A is located in the same plane as the upper flange of the insert A, the honeycomb panel has When the honeycomb core A2 and the skin A3 are bonded with an adhesive film A4 or the like, the upper skin A3 and the device mounting boss A1 are formed.
It is necessary to adjust the surface height with a special jig. For this reason, if the number of inserts is large, the adjustment time is correspondingly long, which causes an increase in manufacturing cost.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems in the insert used in the conventional honeycomb panel for a satellite.
It is an object of the present invention to provide a honeycomb sandwich panel with an insert and a method for manufacturing the same, which can minimize the use of a filler that causes an increase in weight, and can significantly reduce the time required for manufacturing to reduce the manufacturing cost.

[0008]

In order to achieve this object, the invention according to claim 1 is a honeycomb sandwich panel used as a structure of an artificial satellite or the like and having an insert for fixing mounted equipment, The honeycomb core includes a honeycomb core, a skin adhered to both surfaces in a thickness direction of the honeycomb core, and an insert fixed to a mounting hole provided from the skin on one side to the honeycomb core. The insert includes the honeycomb core. A flange portion is provided at both ends in the axial direction parallel to the thickness direction, and one of the flange portions is inserted into the mounting hole, and then is rotated around the axis so that the flange portion is prevented from falling out of the mounting hole. The other part has a shape facing the periphery of the mounting hole irrespective of the rotation about the axis, and the other part of the flange part has the same height as the skin. A device mounting surface having, is characterized in that the stepped surface having a depth in consideration of the thickness of the adhesive layer is formed on this device mounting surface.

According to a second aspect of the present invention, in the honeycomb sandwich panel with the insert according to the first aspect, one of the flange portions of the insert is formed as a pair of leaves extending radially from the center of the shaft. It is characterized by.

According to a third aspect of the present invention, in the honeycomb sandwich panel with the insert according to the first aspect, both of the flange portions of the insert have contact portions with the skin.

According to a fourth aspect of the present invention, there is provided the method for manufacturing a honeycomb sandwich panel with an insert according to any one of the first to third aspects, wherein one of the flange portions of the insert has a mounting hole for the insert. After inserting the honeycomb core, the honeycomb core is rotated so as to rotate around the shaft and is kept in a locked state, and the honeycomb core is placed on the skin and the adhesive layer sequentially stacked on the upper surface of the platen. An adhesive layer is provided on the step surface, and a skin provided with the mounting holes for the insert is placed thereon, and a jig is placed thereon, and bonding is performed while uniformly applying pressure through the jig. Features.

[0012]

According to the first aspect of the present invention, since one of the flange portions of the insert is inserted into the insert mounting hole and then turned around the axis to prevent the insert from falling off, the filling for fixing the insert is performed. No agent is required. In addition, the other of the flange portions has a device mounting surface having the same height as the skin and a step surface at a position close to the surface. The skin to be joined is positioned at the same height as the mounting surface.

According to the second aspect of the present invention, since one of the flange portions is formed in a leaf shape, it can be reliably prevented from coming off by rotating around the axis, and the insert can be securely removed without using a filler. Can be prevented.

According to the third aspect of the present invention, since the flange portion comes into contact with the skin, a heat conduction path and electrical conductivity between the front and back surfaces of the honeycomb core can be secured.

According to the present invention, the skin is placed on the surface plate, the adhesive layer is disposed thereon, the honeycomb core is disposed thereon, and the adhesive layer is further disposed thereon. The outer skin is placed on top, and the jig is placed on the upper surface, and the outer skin and the jig are uniformly pressed according to the parallelism between the surface plate and the jig. Is secured.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to illustrated embodiments. FIG. 1 shows a honeycomb sandwich panel with inserts according to an embodiment of the present invention. In FIG. 1, a honeycomb sandwich panel with inserts 10 includes an adhesive layer 12 located on both sides in the thickness direction of a honeycomb core 11, and an adhesive layer 12 The skins 13 and 14 made of a material having good thermal conductivity and electrical conductivity such as aluminum which are joined to the honeycomb core 11 through the inside and the insert mounting holes 11A formed in the honeycomb core 11 (see FIG. 2). And a fixed insert 15. Insert 15
As shown in FIG. 2, flange portions 15A, 15A are provided at both axial ends parallel to the thickness direction of the honeycomb core 11, respectively.
B, on the other hand, a flange portion 15A located at the lower portion in the figure is formed in a pair of leaves extending in the radial direction from the center of the shaft, and the other flange portion 15B located at the upper portion in FIG. Are formed in a disk shape. For this reason, the shape of the insert mounting hole 11A formed in the honeycomb core 11 is also formed in a leaf shape, whereby one flange portion 15A is rotated around the axis after being inserted into the insert mounting hole 11A. Then, it is prevented from falling out of the mounting hole 11A and held.

In FIG. 1, the other flange portion 15B
Is provided with a device mounting surface 15B1 constituted by a plane having the same height as that of the skin 13.
5B1 is formed with a female screw 15B2 for fastening a bolt used when mounting the device. Further, the peripheral portion of the device mounting surface 15B1 is a step surface 15B3 having a depth with respect to the device mounting surface 15B1 in consideration of the thickness of the adhesive layer 12. A part 15B4 of the step surface 15B3 is formed as a whole or a part in the area of the seat of the mounted device, and is a contact portion having a height to contact the skin 13, and an adhesive corresponding to this portion is provided. The lack of the position of the layer 12 allows the contact with the epidermis 13. The contact portion is also provided on one of the flange portions 15A. In other words, the central portion of one of the flange portions 15A is a convex portion 15A1 protruding from the leaf-shaped portion toward the skin 14, and the skin is formed by losing the adhesive layer 12 corresponding to the convex portion 15A1. 14.

Since the present embodiment has the above configuration,
After the insert 15 is inserted into the insert mounting hole 11A of the honeycomb core 11, the insert 15 is prevented from coming off by rotating the insert 15 around the axis so that the phases of the one flange portion 15A and the insert mounting hole 11A are different. Inserts without fillers
5 can be fixed in the honeycomb core 11. That is, in FIG. 1, the upward movement of the insert 15 is restricted by the phase difference between the one flange portion 15A and the insert mounting hole 11A, and the downward movement of the insert 15 is caused by the other flange 15B in addition to the skin 14. It is regulated by interference with the insert mounting hole 11A. Further, the other flange portion 15B is formed at a height such that the device mounting surface 15B1 is flush with the skin 13, so that the parallelism with the skin 13 is ensured and the contact with the mounted device can be performed well. Therefore, it is possible to ensure heat conductivity and conductivity for the mounted equipment. That is, since the stepped surface 15B3 in consideration of the thickness of the adhesive layer 12 is located near the device mounting surface 15B1 on the other flange portion 15B, the skin 13 located on the upper surface of the adhesive layer 12 on this surface is not provided. Even if the adhesive layer 12 exists, it can be positioned at the same height as the device mounting surface 15B1, and the same flatness as the insert 15 can be secured. Also, the skin 1 at the same height as the device mounting surface 15B1
3, the contact portion 15B4 of the other flange portion 15B can directly contact, so that the contact area with the mounted device, in other words, the heat receiving and conducting area can be increased. Concerning the heat conductivity and the conductivity, one of the flange portions 15A is also provided with the convex portion 15A1, so that the heat transfer between the heat receiving surface receiving the sunlight and the heat radiating surface not receiving the sunlight, and furthermore, of the ground surface. Expansion becomes possible.

Next, a method of manufacturing the above-described honeycomb sandwich panel 10 with inserts will be described. FIG.
, The insert mounting hole 11A of the honeycomb core 11
After inserting one of the flange portions 15A of the insert 15 into the inside, the flange portion 15A is rotated around an axis to maintain a state in which the flange portion 15A is prevented from being removed, and the surface layer 14 and the adhesive layer 12 are previously laminated on the surface plate 16 in advance. The honeycomb core 11 and the insert 15 are placed on the adhesive layer 12 in advance. At this time, the adhesive layer 12 has been cut off at the portion of the convex portion 15A1 located on the one flange portion 15A of the insert 15.
Next, the skin 13 is placed on the honeycomb core 11 via the adhesive layer 12. In this case, the step surface 15B3 on the other flange portion 15B of the insert 15
The adhesive layer 12 is positioned at this position.
A jig (not shown) is placed on the upper surface of the skin 13 located on the upper surface 2 to form a closed space including the jig and the skin 14. A suction means (not shown) is connected to the enclosed space, and when the space is evacuated by the suction means, the platen 16
Since the skin 13 and the insert 15 are uniformly pressed according to the parallelism between the tool and the jig, the device mounting surface 15B1 of the other flange portion 15B and the skin 13 form the same plane. Accordingly, the parallelism between the device mounting surface 15B1 and the adjacent skin 13 is ensured, so that the contact area for ensuring heat conductivity and electrical conductivity is maintained.

According to the above-described embodiment, since the parallelism between the insert 15, particularly the other flange portion 15 B, which is the contact side with the mounted device, and the skin 13 can be ensured, thereby the electrical conductivity can be ensured. Conventionally, the work of connecting the skins with a conductive member, which has been performed to secure the conductivity hindered by the adhesive, becomes unnecessary. In addition, since the work of joining the skin and forming the honeycomb sandwich panel and the work of fixing the insert can be performed almost at the same time, the fixing of the insert in addition to the formation of the honeycomb sandwich panel and the subsequent machining of the insert mounting hole, which has been conventionally performed. Since the work, that is, the work of injecting the filler and the work of adjusting the flatness can be simplified, the processing time can be reduced and the work can be facilitated.

[0021]

As is apparent from the above description, according to the first aspect of the present invention, after one of the flange portions of the insert is inserted into the insert mounting hole, it is prevented from coming off by rotating around the axis. Therefore, it is not necessary to use a filler for fixing the insert. In addition, the other of the flange portions has a device mounting surface having the same height as the skin and a step surface at a position close to the surface. The skin to be joined is positioned at the same height as the mounting surface. This eliminates the need for a filler filling operation and a flatness adjustment operation, thereby shortening the operation time and reducing the weight. In particular, it becomes possible to obtain a honeycomb sandwich panel with inserts that can greatly reduce the work time, which has been lengthened in proportion to the increase in the number of inserts.

According to the second aspect of the present invention, since one of the flange portions is formed in a leaf shape, the flange portion can be surely prevented from coming off by rotating around the axis, and the insert can be securely inserted without using a filler. It is possible to obtain a honeycomb sandwich panel with an insert that can prevent the falling off of the honeycomb sandwich panel.

According to the third aspect of the present invention, since the flange portion comes into contact with the skin, a heat conduction path and electrical conductivity between the front surface and the back surface of the honeycomb core can be secured, and the heat radiation characteristics In addition, it is possible to obtain a honeycomb sandwich panel with an insert having excellent ground characteristics.

According to the fourth aspect of the present invention, the outer skin is placed on the surface plate, the adhesive layer is disposed thereon, the honeycomb core is disposed thereon, and the adhesive layer is further disposed thereon. The skin is placed on top of it, and the jig is placed on the upper surface, and the skin and the jig are uniformly pressed according to the parallelism between the surface plate and the jig. It is possible to obtain a method for manufacturing a honeycomb sandwich panel with inserts, which can ensure the parallelism with the surface.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a structure of a honeycomb sandwich panel on which an insert according to an embodiment of the present invention is mounted and a part of a manufacturing process thereof.

FIG. 2 is a perspective view for explaining a mounting state of the insert shown in FIG. 1;

FIG. 3 is a schematic diagram for explaining a structure of a honeycomb sandwich panel with inserts using a conventional insert structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Honeycomb sandwich panel with an insert 11 Honeycomb core 11A Insert mounting hole 12 Adhesive layer 13, 14 Skin 15 Insert 15A One flange part 15A1 Convex part equivalent to a contact part 15B The other flange part 15B1 Equipment mounting surface 15B3 Step surface 15B4 Contact part 16 Platen

Claims (4)

[Claims] Claims: 1. It is used as a structure of an artificial satellite or the like,
A honeycomb sandwich panel to which an insert for fixing a mounted device is attached, comprising a honeycomb core, a skin bonded to both surfaces in a thickness direction of the honeycomb core, and mounting holes provided from the skin on one side to the honeycomb core. The insert has a flange portion at both ends in the axial direction parallel to the thickness direction of the honeycomb core, and one of the flange portions is rotated around the axis after being inserted into the mounting hole. When it is made to be a shape that is prevented from falling out of the mounting hole, the other of the flange portions is shaped to face the periphery of the mounting hole regardless of rotation around the axis, and the other of the flange portions is the above-mentioned skin. A device mounting surface having the same height and a step surface having a depth in consideration of the thickness of the adhesive layer are formed on the device mounting surface. Honeycomb sandwich panels with inserts and symptoms. 2. The honeycomb sandwich panel with an insert according to claim 1, wherein one of the flange portions of the insert is formed in a pair of leaves extending radially from a center of the shaft. Honeycomb sandwich panel. 3. The honeycomb sandwich panel with an insert according to claim 1, wherein a contact portion with the skin is formed on both of the flange portions of the insert. 4. The method of manufacturing a honeycomb sandwich panel with an insert according to claim 1, wherein one of the flange portions of the insert is inserted into a mounting hole of the insert, and then the shaft is rotated around an axis. The honeycomb core is placed on the skin and the adhesive layer sequentially laminated on the upper surface of the surface plate, and the adhesive layer is placed on the other step surface of the honeycomb core and the flange portion. A honeycomb with an insert, wherein a skin on which the mounting holes for the inserts are provided is placed thereon, and a jig is stacked thereon, and bonded while uniformly pressing the jig via the jig. Manufacturing method of sandwich panel.