JP3107477B2 - Honeycomb panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a honeycomb panel. That is, the present invention relates to a honeycomb panel which can be bent into a cubic curved surface or other complicated curved surfaces and is used for various devices and structural materials including an outer wall of a rocket tip.

[0002]

2. Description of the Related Art A honeycomb core is formed of a planar aggregate of hollow columnar cells and has various characteristics such as excellent weight ratio strength. Each cell wall has a linear plate shape, and each cell has a regular hexagonal shape. Those having a prismatic shape are typical. A honeycomb panel having such a fixed-shaped honeycomb core as a core material and having a surface plate bonded thereto is widely used for various applications. However, when a honeycomb panel using such a fixed-shaped honeycomb core as a core material is to be bent into a curved shape, warpage, distortion, breakage, peeling, and the like are likely to occur, and a tertiary curved surface and other complicated curved surfaces are likely to occur. It has been extremely difficult to bend the shape with high precision, that is, to freely and completely fit a curved surface having a radius of curvature of a predetermined curvature. FIG. 7A is an explanatory plan view of such a conventional example 1. FIG. In the honeycomb panel 1 of the first conventional example, the above-described fixed-shaped honeycomb core 4 in which a regular hexagonal cell 3 is stretched and formed by a straight plate-shaped cell wall 2 is used as a core material. In the drawings, the illustration of the surface plate is omitted, W indicates the extending direction, and L indicates the ribbon direction perpendicular to this.

[0003] In order to improve the poor bending workability of the conventional example 1 into a curved surface shape, the following conventional examples 2, 3, and 4 are described.
Was developed and used. First, FIGS. 7 (2) and (3) are an explanatory plan view and a front view of Conventional Example 2. FIG. In the honeycomb panel 1 of the second conventional example, the honeycomb core 4 in which the vertically long hexagonal cells 3 are stretched and formed by the cell walls 2 having a linear plate shape, that is, the first conventional example shown in FIG. 100% expansion rate of honeycomb core 4
%, The honeycomb core 4 with an expansion ratio of 50% to 80% underexpanded is used as a core material, and is used particularly when the entire thickness is large. FIGS. 8A and 8B are an explanatory plan view and a side view of the conventional example 3. FIG. In the honeycomb panel 1 of the third conventional example, a honeycomb core 4 in which a horizontally long hexagonal cell 3 close to a rectangle is stretched and formed by a linear plate-shaped cell wall 2, that is, the conventional honeycomb panel shown in FIG. When the expansion rate of the honeycomb core 4 of Example 1 is 100%, the expansion rate is 1
A honeycomb core 4 over-extended to about 10% was used as a core material.

FIGS. 8 (3) and 4 (4) are a plan view and a front view of a conventional example 4, respectively. In the honeycomb panel 1 of the prior art example 4, when the expansion rate of the honeycomb core 4 stretched and formed while being curved into a curved shape, that is, the expansion rate of the honeycomb core 4 of the above-described conventional example 1 is 100%, the expansion rate is The honeycomb core 4 partially changed and varied from 50% to 110% was used as a core material. Therefore, in the conventional example 4, the regular plate-shaped cell wall 2 partially mixes the regular hexagonal, vertically long hexagonal, and horizontally long hexagonal cells 3.

[0005]

However, even in the honeycomb panels 1 of the conventional examples 2, 3, and 4, problems have been pointed out with respect to bendability into a curved shape and other problems. First, in the above-mentioned conventional example 2, FIG.
7 (2), when the honeycomb core 4 which has been under-expanded is curved along the extending direction W as shown in FIG. 7 (3), the honeycomb core 4 is completely formed into a curved surface having a predetermined curvature. It has been considered difficult to fit to a computer, particularly when the predetermined curvature of the curved surface is small. or,
In the conventional example 2, the honeycomb core 4 under-extended
Is used, the problem of heavy weight is pointed out, and the dimension in the stretching direction W is very short, and the length of the fixed length dimension is often insufficient for commercialization. It had been. Further, problems have been pointed out in terms of processing efficiency and processing time.

[0008] In the above-mentioned prior art example 3, the honeycomb core 4 over-expanded as shown in FIG. 8 (1) is moved in the expansion direction W as shown in FIG. 8 (2). It is difficult to completely fit a curved surface having a predetermined curvature when performing a bending process along the ribbon direction L perpendicular to the above, and it has been extremely difficult particularly when the curved surface has a small predetermined curvature. In addition, when the overall thickness is large, there is also a problem that it becomes difficult to completely fit a curved surface having a predetermined porosity regardless of the direction of the bending process. Further, in the conventional example 3, the over-expanded honeycomb core 4
Therefore, a problem has been pointed out in terms of cost, such as the dimension in the ribbon direction L perpendicular to the stretching direction W is very short, and the standard dimension is often insufficient in width. Further, problems have been pointed out in terms of processing efficiency and processing time.

Further, in the above-mentioned prior art 4, as shown in FIGS. 8 (3) and 4 (4), the honeycomb core 4 is stretched and formed while being bent, so that the entire thickness is reduced. It has been difficult to completely fit a curved surface having a predetermined curvature when the cell is thick or dense, that is, when the cell size of the cell 3 is small. Further, problems have been pointed out in terms of processing efficiency and processing time.

In addition to the above-described conventional examples 1, 2, 3, and 4, slits are formed in the thickness direction of each cell wall 2 of the honeycomb core 4 in order to improve the bendability into a curved shape. The conventional example was also developed and used, but it was still difficult to completely fit a curved surface having a predetermined curvature. Further, a conventional example using a fixed-shaped flexible honeycomb core 5 (see FIG. 3 (2) described later) has been recently developed and used in order to improve the bending workability into a curved surface shape. This fixed-shaped flexible honeycomb core 5
Is that all the cell walls 6 are bent in the middle and the respective cell walls 6 are adhered at the contact portions, so that each cell 7 is
It has a rounded, generally convex shape, and is composed of a central portion 8 close to a rectangle and a protrusion 9 close to a triangle. In such a fixed-shaped flexible honeycomb core 5, although the bending workability into a curved surface shape is considerably improved, the strength difference between the ribbon direction L, which is the bonding direction, and the extending direction W, which is perpendicular thereto, is large. It has been pointed out that due to the directionality on the high strength surface, it is still impossible to completely fit a curved surface shape having a predetermined curvature.

The present invention has been made in view of such circumstances, and has been made to solve the above-mentioned problems of the conventional example. The fixed-shaped flexible honeycomb core is further reduced from 128% to 173%.
% By adopting a honeycomb core that is over-extended to about%, as a core material, firstly, it can be bent to a curved surface shape with a predetermined curvature with high accuracy, and secondly, it is also excellent in processing efficiency and processing time. Thirdly, it is an object of the present invention to propose a honeycomb panel which does not become heavy and which is excellent in cost without shortage of length and width.

[0010]

The technical means of the present invention for achieving this object is as follows. First, claim 1
Is as follows. That is, this honeycomb panel is formed by bonding a surface plate to a honeycomb core serving as a core material.
The honeycomb core is made of a planar aggregate of hollow columnar cells, and all the cell walls are bent in the middle and the respective cell walls are bonded to each other, and each cell has a rounded substantially convex shape. The fixed-shaped flexible honeycomb core to be formed is formed by applying a tensile force in a direction perpendicular to the bonding direction of the cell walls, and is further expanded from about 128% to about 173%. In the honeycomb core, all the cell walls are bent at an obtuse angle on the way, and each cell wall also forms an obtuse angle.Each cell has a rounded and deformed substantially convex special shape, and has a hexagonal shape. It consists of a central part close to and a protruding part. Next, claim 2 is as follows. That is, in the honeycomb panel according to the first aspect of the present invention, the honeycomb core is formed by over-extending the honeycomb core along a mold having a predetermined curvature, and is partially compressed and deformed to about 50%. While having a curved surface shape as a whole.

[0011]

The present invention comprises the above-mentioned means, and operates as follows. In this honeycomb panel, a honeycomb core obtained by further extending the fixed-shaped flexible honeycomb core from about 128% to about 173% is used as a core material.
First, this honeycomb panel can be freely and easily deformed into a curved shape having a predetermined curvature because the central part of each cell of the honeycomb core as a core material has a hexagonal shape and a special shape close to a circle. Can be highly curved. In the honeycomb panel according to the second aspect of the present invention, the honeycomb core as the core material is over-stretched along the mold and is bent into a curved shape, so that the bending can be performed more smoothly and accurately.

Second, the honeycomb core and the honeycomb panel can be bent into a curved shape having a predetermined curvature efficiently and without any time. Third, the honeycomb core and the honeycomb panel are not particularly heavy. Fourth, the honeycomb core of the honeycomb panel has a longer extending direction and does not have a significantly shorter ribbon direction.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. FIG. 1 shows a first embodiment of the present invention. FIG. 1A is a plan view of the honeycomb core, and FIG. 1B is a front view of the honeycomb panel. FIG. 2 is a perspective view of the honeycomb core of the first embodiment. FIGS. 3A and 3B are provided for describing a fixed-shaped flexible honeycomb core. FIG. 3A is a front view of the manufacturing process, and FIG. 3B is a plan view. First, a description will be given with reference to FIGS.

The honeycomb panel 10 of the present invention has a surface plate 12 adhered to a honeycomb core 11 as a core material. First, with respect to the honeycomb core 11 as the core material, the fixed-shaped flexible honeycomb core 5 before over-expanding will be described with reference to FIG. The fixed-shaped flexible honeycomb core 5 is formed of a planar assembly of hollow columnar cells 7, and all the cell walls 6 are bent in the middle and the space between the cell walls 6 is bonded, so that each cell 7 is rounded. It has a generally convex shape.

The fixed-shaped flexible honeycomb core 5 is manufactured, for example, as follows. First,
It consists of aluminum and other metal foils, various plastic sheets, fiber reinforced plastic sheets (FRP sheets), prepreg sheets, composite material sheets of organic and inorganic materials including pulp, and other non-metallic sheets such as fibers and cloths. By corrugating the base material sheet, for example, a corrugated plate 13 in which triangular corrugations are continuously bent at a predetermined pitch and height is corrugated.
Then, the corrugated sheet 13 formed in this way is cut at predetermined lengths after the adhesive 14 is applied to the top every other line, and as shown in FIG. The positional relationship in which a plurality of such corrugated sheets 13 are shifted horizontally by one wave each time they are stacked one on another, that is, the adhesive 14 applied every other line
Are vertically stacked in a multi-layered block shape while the tops and the valleys are aligned.

Thereafter, as shown in FIG. 3A, the stacked corrugated plates 13 are interposed between the upper and lower plates P, and the plates P are moved up and down in a furnace or the like. By being heated and pressurized, the adhesive 14 is melt-hardened,
The stacked corrugated plates 13 are bonded together. And the corrugated sheet 13 thus stacked and partially bonded
On the other hand, by applying a tensile force with the stacking direction being the extension direction W, the non-adhered portions of the corrugated plates 13 are extended, deformed, separated, and separated. In this way, by performing the expansion with the bonding direction being the ribbon direction L and the stacking direction orthogonal thereto being the expansion direction W, the fixed-shaped flexible honeycomb core 5 shown in FIG. 3B is manufactured. You. The fixed-shaped flexible honeycomb core 5 is formed of a planar assembly of hollow columnar cells 7, and all the cell walls 6 formed by the corrugated plate 13 are bent while keeping a radius in the middle, Each cell wall 6 is adhered with an adhesive 14, and each cell 7
Has a rounded, generally convex shape and a central portion 8 that is close to a rectangle.
And a protrusion 9 close to a triangle.

The fixed-shaped flexible honeycomb core 5
Can be manufactured without such a manufacturing process,
For example, the base material sheet is formed into a special corrugated sheet (a corrugated sheet corresponding to the shape of the cell wall 6 of the fixed-shaped flexible honeycomb core 5) in which a large wave portion and a small wave portion of a predetermined shape are sequentially and continuously bent. It can also be manufactured by forming, laminating and bonding. Furthermore, it is also possible to manufacture the fixed-shaped flexible honeycomb core 5 by a method in which the adhesive 14 is applied to the base material sheet in a linear manner, a plurality of sheets are stacked, bonded, and then spread. When various plastic sheets, fiber-reinforced plastic sheets, or the like are used as the base material sheet, in the stage of the fixed-shaped flexible honeycomb core 5 and the next honeycomb core 11, the semi-cured state is not yet completely cured without being completely cured. It may be left as it is.

Now, the honeycomb core 11 used in the honeycomb panel 10 of the present invention is prepared as shown in FIG.
(2) With respect to the fixed-shaped flexible honeycomb core 5 having an expansion ratio of 100% in FIG. 2B, a tensile force is applied in the expansion direction W orthogonal to the ribbon direction L, which is the bonding direction of the cell wall 6, to re-apply 128% to 173%. By over-stretching to the extent, it is formed as shown in FIG. 1 (1) and FIG. In this honeycomb core 11, each cell wall 15 formed by over-extending the cell wall 6 of the original fixed-shaped flexible honeycomb core 5 is bent at an obtuse angle while maintaining a radius, and each cell wall 15 is bent. Make an obtuse angle for 15
Also, each cell 16 in which the original cell 7 is over-expanded.
However, each cell 16 has a rounded and deformed substantially convex special shape, and each cell 16 has a hexagonal central portion 17 in which the original central portion 8 is over-extended, and an original projecting portion 9 in which the original projecting portion 9 is over-extended. Projection 18.

For example, in the fixed-shaped flexible honeycomb core 5 shown in FIG. 3 (2), the cell size meter of ten cells 7 in the extending direction W is set to 78 mm, and the expansion ratio is set to 10 mm.
In the case of 0%, with respect to the honeycomb core 11 in FIG. 1A and FIG. 2 in which this is further expanded, the cell size meter of 10 cells 16 in the expansion direction W is as follows. That is, 100% at an expansion rate of 128%, 110mm at an expansion rate of 141%, 115mm at an expansion rate of 147%,
125mm at 159% elongation, 13 at 166% elongation
0mm, 135mm at 173% elongation, etc. If the expansion ratio is less than 128%, the function of reducing the difference in strength between the ribbon direction L and the expansion direction W cannot be obtained, so that not the expected honeycomb core 11 but the fixed-shaped flexible honeycomb core 5 Belongs to the range. On the other hand, if the expansion rate exceeds 173%, the cell wall 15 due to over-expansion will be damaged.
Breakage and cutting can be seen.
% Is the limit of the honeycomb core 11.

The over-expansion for obtaining such a honeycomb core 11 is performed by inserting a pin into each cell 7 of the fixed-shaped flexible honeycomb core 5 or every cell 7 at a constant interval, as in the ordinary expansion process. Thereafter, the process is performed by applying a tensile force to the entire fixed-shaped flexible honeycomb core 5. The honeycomb core 11 obtained in this manner was used.
Also, as with general honeycomb cores, it has excellent strength by weight, has high rigidity and strength as well as light weight, and also has excellent rectifying effect, heat insulation, sound insulation, etc., and has a large surface area per unit volume. It has certain characteristics. By the way, regardless of over-stretching as in the present invention, the base material sheet is formed into a special corrugated sheet (that is, a cell wall 15 of the honeycomb core 11) in which a large wave portion and a small wave portion of a predetermined shape are successively bent. The same shape as the honeycomb core 11 can also be manufactured by forming into a corrugated sheet conforming to the shape of the honeycomb core 11 and stacking and bonding them.

Further, the honeycomb panel 10 of the present invention comprises:
The honeycomb core 11 obtained by over-expanding in this manner
Is used as a core material, and a surface plate 12 is bonded to both surfaces thereof, for example, as shown in FIG. 1 (2). Surface plate 1
As the material 2, the same material as the cell wall 15 of the honeycomb core 11, that is, the cell wall 6 of the fixed-shaped flexible honeycomb core 5 and the base material sheet of the corrugated plate 13 are often used. Further, the bonding between the honeycomb core 11 and the surface plate 12 is performed by interposing an adhesive 14 therebetween, and thereafter, by melting and curing the adhesive 14 by applying heat and pressure. The pressure may be applied simultaneously with the later-described bending process of the honeycomb panel 10.

The present invention is as described above. Then, it becomes as follows. This honeycomb panel 10
Then, the fixed-shaped flexible honeycomb core 5 (see FIG. 3 (2)) in which each cell 7 has a rounded and substantially convex shape,
Further, the honeycomb core 11 (see FIGS. 1 (1) and (2) in FIG. 1) overextended from about 128% to about 173% is used.
It is used as a core material. The honeycomb core 11 serving as the core material has a substantially convex special shape in which each cell 16 is rounded and deformed, and has a central portion 17 and a protruding portion 1 close to a hexagon.
8 Therefore, in the present invention, the following first, second, third, and fourth are obtained.

First, in the honeycomb core 11 as a core material of the honeycomb panel 10, each cell 16 has a special shape as described above, and a central portion 17 has a hexagonal shape and a shape close to a circle. Therefore, due to such a shape of each cell 17, the honeycomb core 11 and the honeycomb panel 10 have a curved surface shape having a radius of a predetermined curvature.
It can be deformed freely and easily, and can be bent with high accuracy. That is, the honeycomb core 11 and the honeycomb panel 10 are bent in the ribbon direction L, which is the bonding direction, or bent in the expansion direction W perpendicular thereto, or when the predetermined curvature of the curved surface shape is If small, the honeycomb core 11 and the honeycomb panel 1
0, or when the honeycomb core 11 has a high density, that is, when the cell size of each cell 16 is small,
Even in such cases, it is possible to bend a curved surface with a predetermined curvature with high accuracy without any trouble. That is, unlike the conventional examples 1, 2, 3, and 4 shown in FIGS.

Further, the honeycomb core 11 is provided in each cell 1
6 has the above-mentioned special shape, so that the difference between the strength planes such as the rigidity and the elasticity between the two orthogonal directions is very small, for example, the difference between the shear strength and the shear modulus between the ribbon direction L and the stretching direction W is small. . Therefore, from this aspect, this honeycomb core 1
1 and the honeycomb panel 10 can be bent to a curved surface with a predetermined curvature with high accuracy. That is, as in the conventional example using the fixed-shaped flexible honeycomb core 5 shown in FIG.
There is no problem in bending the curved surface.

For example, FIG. 4 shows the first embodiment of the present invention described above.
The bending process of the honeycomb panel 10 of an example is shown,
(1) FIG. 1 is a front view of a state interposed between dies 19 having a predetermined curvature, (2) FIG. 2 is a front sectional view of a state of a curved surface,
(3) FIG. As described above, the honeycomb panel 10 using the honeycomb core 11 as a core material is
As shown in FIG. 4 (1), by interposing between the dies 19, performing heating and pressurizing and performing drawing, the drawing shown in FIGS. 4 (2) and (3) is performed. As described above, a curved product having a complicated predetermined curvature can be precisely bent. In this case, the honeycomb core 11 is compressed and deformed at a portion having a small curvature to have an expansion ratio of about 50%.

Secondly, in the present invention, by these, the honeycomb core 11 and the honeycomb panel 10 are efficiently and quickly curved into a curved shape having a predetermined curvature.
Third, since the honeycomb core 11 is manufactured not by under-expansion but by over-expansion as in the conventional example 2 shown in FIGS. 7 (2) and (3) of FIG. There is no heavy weight. Fourth, since this honeycomb core 11 is manufactured by over-expanding the fixed-shaped flexible honeycomb core 5,
The extending direction W is of course longer, and the ribbon direction L
Is not significantly shortened. That is, the extension direction W becomes very short as in the conventional example 2 shown in FIGS. 7 (2) and 7 (3) described above, and the extension direction W shown in FIG.
(2) The ribbon direction L does not become very short unlike the conventional example 3 shown in FIG. Therefore, this honeycomb panel 10
Upon commercialization, the length and width of the stretching direction W and ribbon direction L are
There is no big shortage. Honeycomb panel 1 of the present invention
0 is the first, second, third and fourth described above.

First, in the honeycomb panel 10 of the first embodiment described above, the surface plate 12 is attached to the honeycomb core 11.
Were bonded to form a curved surface having a predetermined curvature. However, regardless of this, the honeycomb core 1 was
1 is separately curved into a curved shape, and then a flat and flexible surface plate 12 is attached to such a honeycomb core 11.
It may be made to be curved and adhered while covering both sides of the sheet. Further, the hard surface plate 12 is curved into a curved shape using the same mold 19 or the like, and such a surface plate 12 is bonded to both surfaces of the honeycomb core 11 which has been separately curved into a curved shape. You may make it.

Second, FIG. 5 is a front view showing a honeycomb panel 10 according to a second embodiment of the present invention, which is formed into a curved surface. That is, in the honeycomb panel 10 of the above-described first embodiment, the surface plates 12
However, as in the honeycomb panel 10 of the second embodiment, the surface plate 12 is adhered to only one surface of the honeycomb core 11 and may be curved into a curved shape having a predetermined curvature. Conceivable.

Third, FIG. 6 shows a honeycomb panel 10 according to a third embodiment of the present invention, and FIG.
FIG. 2B is an enlarged view of a main part, FIG. 3C is a front view of an upside down view, and FIG. 4D is a front view of a curved surface. That is, in the honeycomb panel 10 of the above-described first embodiment and the like, the slits 20 and the like are not formed at all in the cell wall 15 and the surface plate 12 of the honeycomb core 11. However, in the honeycomb panel 10 of the third embodiment, Panel 10 having a surface plate 12 adhered to both sides as described above
It is conceivable that slit processing is performed from the side of the surface plate 12 on one side to the cell wall 15 of the honeycomb core 11 serving as a core material to form a large number of slits 20 at predetermined intervals. In the example of FIG. 6, a large number of linear slits 20 that are crossed vertically and horizontally are formed, and as shown in FIG. 6 (4), one side on which the slits 20 are formed is inside and curved into a curved shape. When processing is performed, there is an advantage that bending processing can be performed more smoothly and accurately.

Fourth, in the honeycomb panel 10 of each embodiment described above, after the fixed-shaped flexible honeycomb core 5 is over-extended to form a predetermined honeycomb core 11, a bending process into a curved surface shape having a predetermined curvature is performed. However, regardless of this, as the honeycomb core 11 as the core material,
A honeycomb panel 1 that is over-stretched along the mold 19 (see FIG. 4A) to form a curved surface is used.
An embodiment with 0 is also conceivable. In other words, the expansion rate is 100%
The fixed-shaped flexible honeycomb core 5 is over-extended along a mold 19 having a predetermined curvature to form a honeycomb core 11, and the honeycomb core 11 which has been curved into a curved surface shape having a predetermined curvature and is over-expanded is used. Thus, the honeycomb panel 10 may be obtained.

In the honeycomb core 11 of such an embodiment, a portion having a small curvature has a partial expansion rate of 50%.
In addition to being compressed and deformed to the extent, the other portion is over-extended from about 128% to about 173%, and the surface plate 12 is made of such a honeycomb core in advance in accordance with the above-described first aspect. 11 and bend together, or bend separately and bond. Now, in this embodiment, the honeycomb core 11 as the core material of the honeycomb panel 10 is formed by bending the fixed-shaped flexible honeycomb core 5 over a mold 19 having a predetermined curvature so as to be curved into a curved shape having a predetermined curvature. Be done. Therefore, there is an advantage that the honeycomb core 11 and the honeycomb panel 10 are smoothly and precisely bent.

[0032]

As described above, the honeycomb panel according to the present invention employs, as the core material, a honeycomb core obtained by further expanding the fixed-shaped flexible honeycomb core from about 128% to about 173% as the core material. It is effective.

First, it is possible to bend into a curved surface having a predetermined curvature with high accuracy. That is, this honeycomb panel can be bent to a cubic curved surface or other complicated curved surface with high precision without warping, distortion, breakage, peeling, and the like, and can be freely and completely formed into a curved surface having a radius of curvature of a predetermined curvature. Can be fitted. Second, it is also excellent in processing efficiency and processing time. That is,
The honeycomb panel can be bent into a curved surface having a predetermined curvature efficiently and without any time.

Third, the weight does not increase. That is, the honeycomb core is manufactured without using the under-stretching, and the weight of the honeycomb panel does not increase. Fourth, it is excellent in cost, for example, there is no shortage of length or width. That is, when this honeycomb panel is commercialized,
Even with a fixed size, there is no significant shortage in the length or width in the stretching direction or ribbon direction, and the cost is excellent.
As described above, the effects exhibited by the present invention are remarkably large, for example, the problems existing in this type of conventional example are eliminated.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of a honeycomb panel according to the present invention, wherein FIG. 1A is a plan view of the honeycomb core, and FIG. 1B is a front view of the honeycomb panel.

FIG. 2 is a perspective view of the honeycomb core of the first embodiment.

FIGS. 3A and 3B are explanatory views of a fixed-shaped flexible honeycomb core. FIG. 1A is a front view of the manufacturing process, and FIG. 3B is a plan view of the fixed-shaped flexible honeycomb core.

FIG. 4 shows a process of bending the honeycomb panel of the first embodiment, and FIG. 4A is a front view showing a state where the honeycomb panel is interposed between dies;
FIG. 2B is a front cross-sectional view of a curved shape, and FIG.
The figure is an external perspective view of the same.

FIG. 5 shows a honeycomb panel according to a second embodiment of the present invention,
It is a front view in the state made into a curved surface shape.

FIG. 6 shows a honeycomb panel according to a third embodiment of the present invention,
(1) Figure is an external perspective view, (2) Figure is an enlarged view of a main part,
FIG. 3 (3) is a front view of an upside down view, and FIG. 4 (4) is a front view of a curved shape.

FIG. 7 shows a honeycomb core as a core material of a honeycomb panel of a conventional example of this kind, and FIG.
FIG. 2B is an explanatory plan view of Conventional Example 2, and FIG. 3C is a front view of Conventional Example 2 in a state of a curved surface.

FIG. 8 shows a honeycomb core as a core material of a honeycomb panel of a conventional example of this type, and FIG.
FIG. 2B is a side view of Conventional Example 3 in a curved surface state, FIG. 3C is a plan view of Conventional Example 4, and FIG.
It is a front view of the conventional example 4 in the state made into the curved surface shape.

[Explanation of symbols]

 5 Flexible honeycomb core with fixed shape 6 Cell wall 7 Cell 10 Honeycomb panel 11 Honeycomb core 12 Surface plate 15 Cell wall 16 Cell 17 Central part 18 Projection 19 Type L Ribbon direction W Extension direction

Claims (2)

(57) [Claims] 1. A honeycomb panel in which a surface plate is bonded to a honeycomb core serving as a core material, wherein the honeycomb core is formed of a planar assembly of hollow columnar cells, and all cell walls are bent halfway. In addition, the cell walls are adhered to each other, and the fixed-shaped flexible honeycomb core in which each cell has a rounded and substantially convex shape is formed by applying a tensile force in a direction orthogonal to the adhesion direction of the cell walls, and further molded. 128% to 173
% Of the honeycomb core, each of the cell walls is bent at an obtuse angle in the middle and each of the cell walls also forms an obtuse angle, and each cell is rounded and substantially convex. A honeycomb panel having a special shape of a letter and comprising a central portion close to a hexagon and a protruding portion. 2. The honeycomb panel according to claim 1, wherein the honeycomb core is formed by over-expanding along a mold having a predetermined curvature, and has a portion partially compressed and deformed to about 50%. The honeycomb panel has a curved surface as a whole.