JPH06316012A - Honeycomb panel - Google Patents

Abstract

PURPOSE:To provide a honeycomb panel which can be curved into a curved face with a predetermined curvature at high precision, is advantageous with respect to processing efficiency and time, is prevented from becoming heavy, has sufficient length and width, and is advantageous also in cost. CONSTITUTION:In a honeycomb panel 10, a surface plate 12 is adhered to a honeycomb core 11 as a core material. The honeycomb core 11 is formed by adding a tensile force to a regularly shaped flexible honeycomb core whose cells are all bent halfway and the cell walls are stuck together and each of the cells has a roundish nearly protruding shape, in a direction rectangular with respect to the adhering direction of the cell walls. The honeycomb core 11 is extended over about 128-173%, the cell walls 15 are all bent obtusely halfway, the intervals among the cell walls 15 also make obtuse angles, and each of the cells 16 has a specific form with a roundish deformed nearly protruding shape, consisting of a nearly hexagon central part 17 and a protruding part 18.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a honeycomb panel. That is, the present invention relates to a honeycomb panel that can be curved into a complicated curved surface such as a cubic curved surface and that is used for various equipments and structural materials including the outer wall of the tip of a rocket.

[0002]

2. Description of the Related Art A honeycomb core is made of a planar aggregate of hollow columnar cells and has various characteristics such as excellent weight-specific strength. Each cell wall has a straight plate shape and each cell has a regular hexagonal shape. A prismatic shape is typical. A honeycomb panel having such a fixed-shape honeycomb core as a core material and a surface plate bonded thereto is widely used for various purposes. However, when a honeycomb panel in which such a honeycomb core having a fixed shape is used as a core material is subjected to bending processing into a curved surface shape, warping, distortion, breakage, peeling, etc. are likely to occur, and a cubic curved surface or other complicated curved surface. It has been extremely difficult to curve the shape with high accuracy, that is, to freely and completely fit a curved surface shape having a radius of a predetermined curvature. FIG. 7 (1) is a plan view of the conventional example 1 as described above. In the honeycomb panel 1 of Conventional Example 1, the above-mentioned regular-shaped honeycomb core 4 formed by expanding the regular hexagonal cells 3 by the linear plate-shaped cell walls 2 is used as a core material. In the drawings, the surface plate is not shown, W indicates the spreading direction, and L indicates the ribbon direction at right angles thereto.

Now, in order to improve such poor bending workability of the conventional example 1 into the curved surface shape, the following conventional examples 2, 3, 4 are used.
Honeycomb panel 1 of was developed and used. First, FIGS. 7 (2) and 7 (3) are a plan explanatory view and a front view of the second conventional example. In the honeycomb panel 1 of the conventional example 2, the honeycomb core 4 in which the vertically long hexagonal cells 3 are stretch-molded by the linear plate-shaped cell walls 2, that is, the honeycomb core 1 of the conventional example 1 of FIG. The expansion rate of the honeycomb core 4 is 100
%, The honeycomb core 4 underexpanded to have an expansion rate of about 50% to 80% was used as a core material, and was used particularly when the entire thickness was large. 8 (1) and 8 (2) are a plan explanatory view and a side view of the conventional example 3. FIG. In the honeycomb panel 1 of Conventional Example 3, the honeycomb core 4 in which the horizontally long hexagonal cells 3 close to a rectangle are stretch-molded by the linear plate cell walls 2, that is, the conventional honeycomb core shown in FIG. When the expansion rate of the honeycomb core 4 of Example 1 is 100%, the expansion rate is 1
The honeycomb core 4 overextended to about 10% was used as the core material.

Further, FIGS. 8 (3) and 8 (4) are a plan explanatory view and a front view of the conventional example 4, respectively. In the honeycomb panel 1 of Conventional Example 4, when the expansion rate of the honeycomb core 4 that is formed while being curved into a curved shape, that is, the expansion rate of the honeycomb core 4 of Conventional Example 1 described above is 100%, the expansion rate is 100%. The honeycomb core 4 having a partial variation of 50% to 110% and being unevenly distributed was used as the core material. Therefore, in this Conventional Example 4, the cells 3 having regular hexagons, vertically long hexagons, and horizontally long hexagons are partially mixed by the straight plate-shaped cell walls 2.

[0005]

However, even in the honeycomb panels 1 of the conventional examples 2, 3, and 4 as described above, problems such as bending workability into a curved shape and other problems have been pointed out. First, in the conventional example 2 described above, FIG.
When the honeycomb core 4 under-expanded as shown in FIG. 2 (2) is curved along the expansion direction W as shown in FIG. 7 (3), it has a curved surface with a predetermined curvature. Was difficult to fit, and it was considered extremely difficult especially when the predetermined curvature of the curved surface shape was small. or,
In this Conventional Example 2, the under-expanded honeycomb core 4 is used.
Since it is used, the problem that the weight is heavy is pointed out, and the dimension in the extending direction W is very short, and there is often a shortage in the standard size when commercializing, so there is also a problem in terms of cost. It had been. Furthermore, problems have been pointed out in terms of processing efficiency and processing time.

In addition, in the above-mentioned conventional example 3, the honeycomb core 4 overextended as shown in FIG. 8 (1) is expanded in the extending direction W as shown in FIG. 8 (2). It has been difficult to completely fit a curved surface shape having a predetermined curvature when curved along the ribbon direction L perpendicular to, and it has been considered extremely difficult especially when the curved surface shape has a small predetermined curvature. In addition, when the entire thickness is thick, there is a problem that it becomes difficult to completely fit a curved surface shape of a predetermined pole ratio regardless of the bending direction. Further, in this Conventional Example 3, the over-expanded honeycomb core 4 is used.
However, since the size in the ribbon direction L, which is perpendicular to the spreading direction W, is very short, and the width is often insufficient in the standard size, a problem in cost has been pointed out. Furthermore, problems have been pointed out in terms of processing efficiency and processing time.

Further, in the conventional example 4 described above, as shown in FIGS. 8 (3) and 8 (4), the honeycomb core 4 is stretch-formed while being curved, so that the entire thickness is reduced. It has been considered difficult to perfectly fit a curved surface shape having a predetermined curvature when the cell 3 is thick or has a high density, that is, when the cell size of the cell 3 is small. Furthermore, problems have been pointed out in terms of processing efficiency and processing time.

In addition to the above-mentioned conventional examples 1, 2, 3, and 4, each cell wall 2 of the honeycomb core 4 is slit in the thickness direction in order to improve the bending workability into a curved shape. The conventional example was also developed and used, but it was still difficult to completely fit a curved surface shape having a predetermined curvature with this alone. Furthermore, a conventional example using a fixed-shape flexible honeycomb core 5 (see FIG. 3 (2), which will be described later) has also been developed and used recently in order to improve bending workability into a curved shape. This fixed shape flexible honeycomb core 5
All of the cell walls 6 are bent in the middle, and the cell walls 6 are adhered to each other at the abutting portions, so that the cells 7 are
It has a rounded and substantially convex shape, and is composed of a central portion 8 that is close to a rectangle and a protruding portion 9 that is close to a triangle. In such a fixed-shape flexible honeycomb core 5, although the bending workability into a curved shape is considerably improved, there is a large difference in strength between the ribbon direction L, which is the bonding direction, and the spreading direction W, which is at a right angle to the ribbon direction L. It has been pointed out that it is still impossible to perfectly fit a curved surface shape having a predetermined curvature due to the directivity in terms of strength.

In view of the above situation, the present invention has been made to solve the above-mentioned problems of the conventional example, and a fixed-shaped flexible honeycomb core is further added from 128% to 173.
%, By adopting a honeycomb core over-expanded as a core material, firstly, it is possible to accurately perform curved processing to a curved surface shape with a predetermined curvature, and secondly, it is excellent in processing efficiency and processing time. Thirdly, it is an object of the present invention to propose a honeycomb panel that does not become heavy, and fourthly, has no shortage of length or width and is excellent in cost.

[0010]

The technical means of the present invention for achieving this object are as follows. First, claim 1
About: That is, in this honeycomb panel, the surface plate is bonded to the honeycomb core that is the core material.
The honeycomb core is composed of a planar aggregate of hollow columnar cells, each cell wall is bent halfway and the cell walls are bonded together, and each cell has a rounded and substantially convex shape. The formed flexible honeycomb core is formed by applying a tensile force in a direction orthogonal to the bonding direction of the cell walls, and is further expanded from about 128% to 173%. The honeycomb core is such that each cell wall is bent at an obtuse angle in the middle and an obtuse angle is also formed between the cell walls, and each cell has a rounded and deformed substantially convex special shape, and a hexagonal shape. It consists of a central part near to and a protruding part. Next, claim 2 is as follows. That is, this honeycomb panel is the honeycomb panel of claim 1, wherein the honeycomb core is over-expanded along a mold having a predetermined curvature, and is partially compressed and deformed to about 50%. However, it has a curved surface as a whole.

[0011]

Since the present invention comprises such means, it operates as follows. This honeycomb panel uses, as a core material, a honeycomb core obtained by further expanding a shaped flexible honeycomb core from about 128% to 173%.
Therefore, firstly, since the central portion of each cell of the honeycomb core, which is a core material, has a hexagonal shape and a special shape close to a circle, this honeycomb panel can be freely and easily deformed into a curved surface shape with a predetermined curvature, and the accuracy can be improved. Can be curved high. In the honeycomb panel according to the second aspect, the honeycomb core as the core material is over-expanded along the mold and curved into a curved shape, so that the bending can be performed more smoothly and accurately.

Secondly, these allow the honeycomb core and the honeycomb panel to be efficiently curved into a curved surface having a predetermined curvature in a short time. Thirdly, the honeycomb core and the honeycomb panel do not become particularly heavy. Fourthly, the honeycomb core of this honeycomb panel has a longer extending direction and a substantially shorter ribbon direction.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the embodiments shown in the drawings. FIG. 1 shows a first embodiment of the present invention. FIG. 1 (1) is a plan view of the honeycomb core, and FIG. 2 (2) is a front view of the honeycomb panel. FIG. 2 is a perspective view of the honeycomb core of the first embodiment. 3A and 3B are provided for explaining the fixed-shape flexible honeycomb core, FIG. 1A is a front explanatory view of the manufacturing process, and FIG. 3B is a plan view thereof. First, a description will be given based on these FIG. 1, FIG. 2 and FIG.

The honeycomb panel 10 of the present invention comprises a honeycomb core 11 as a core material and a surface plate 12 bonded thereto. First, regarding the honeycomb core 11 as the core material, the fixed-shape flexible honeycomb core 5 before the over-expansion will be described with reference to FIG. This fixed-shape flexible honeycomb core 5 is composed of a planar aggregate of hollow columnar cells 7, each cell wall 6 is bent in the middle and each cell wall 6 is adhered, and each cell 7 is rounded. It has a generally convex shape.

The fixed shape 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 sheets of organic and inorganic materials including pulp, and other various non-metal sheets such as fibers and cloth. By corrugating the base material sheet, for example, the corrugated plate 13 in which triangular corrugated irregularities are continuously bent at a predetermined pitch and height is corrugated.
Then, the corrugated sheet 13 formed in this way is coated with the adhesive 14 on every other line and then cut into predetermined lengths, as shown in FIG. 3 (1). A plurality of such corrugated plates 13 are shifted in the horizontal direction by one wave each time they are stacked one by one, that is, the adhesive 14 applied every other line.
With the positional relationship that the top and bottom are shifted to the left and right, the crests and the troughs are aligned, and they are densely stacked in a multilayer block shape.

Thereafter, as shown in FIG. 3A, the corrugated plates 13 thus stacked are placed between the upper and lower plates P, and the plates P are moved up and down in a furnace or the like. By applying heat and pressure, the adhesive 14 is melted and cured,
The corrugated plates 13 that have been stacked are bonded together. Then, the corrugated sheets 13 that are stacked and partially adhered in this way
On the other hand, by applying a tensile force with the stacking direction as the expansion direction W, the non-adhesive portion of each corrugated plate 13 is expanded, deformed, separated, and separated. In this way, by performing the spreading with the bonding direction as the ribbon direction L and the stacking direction orthogonal to this as the spreading direction W, the fixed shape flexible honeycomb core 5 shown in FIG. 3B is manufactured. It This fixed-shape flexible honeycomb core 5 is made of a planar aggregate of hollow columnar cells 7, and each cell wall 6 formed of the corrugated plate 13 is bent while leaving a radius in the middle, The cell walls 6 are adhered to each other with an adhesive 14,
Has a rounded, almost convex shape, and the central part 8 is close to a rectangle.
And a protrusion 9 close to a triangle.

The fixed shape flexible honeycomb core 5
Can be manufactured without such a manufacturing process,
For example, a base material sheet is formed into a special corrugated plate in which large wave portions and small wave portions of a predetermined shape are sequentially and continuously bent (that is, a corrugated sheet corresponding to the shape of the cell wall 6 of the fixed shape flexible honeycomb core 5). It can also be manufactured by forming, stacking and adhering them. Furthermore, it is also possible to manufacture the fixed-shaped flexible honeycomb core 5 by a method in which the base material sheet is coated with the adhesive 14 in a linear shape, a plurality of sheets are stacked and adhered, and then spread. When various plastic sheets, fiber reinforced plastic sheets, etc. are used as the base material sheet, at the stage of the fixed shape flexible honeycomb core 5 and the next honeycomb core 11, they are not yet completely cured and are in a semi-cured state. You can leave it alone.

Now, the honeycomb core 11 used in the honeycomb panel 10 of the present invention is prepared as shown in FIG.
(2) In the fixed-shaped flexible honeycomb core 5 having a spreading rate of 100%, a tensile force is applied in the spreading direction W orthogonal to the ribbon direction L, which is the bonding direction of the cell walls 6, and again from 128% to 173%. By over-expanding to some extent, it is molded as shown in FIG. 1 (1) and FIG. 2. In this honeycomb core 11, each cell wall 15 formed by overextending the cell wall 6 of the original fixed-shape flexible honeycomb core 5 is bent at an obtuse angle while leaving a radius in the middle, and each cell wall 15 is also bent. I made an obtuse angle between 15 and
In addition, each cell 16 in which the original cell 7 is overstretched
Has a rounded and deformed substantially convex special shape, and each cell 16 has a central portion 17 close to a hexagon in which the original central portion 8 is over-expanded and an original protruding portion 9 is over-expanded. And a protruding portion 18.

For example, in the fixed-shape flexible honeycomb core 5 shown in FIG. 3B, the cell size meter for 10 cells 7 in the expansion direction W is 78 mm, and the expansion rate is 10 mm.
When it is set to 0%, the cell size meter of ten cells 16 in the expansion direction W is as follows for the honeycomb core 11 in FIGS. That is, the expansion rate of 128% is 100 mm, the expansion rate of 141% is 110 mm, the expansion rate of 147% is 115 mm,
125 mm at an expansion rate of 159%, 13 at an expansion rate of 166%
0mm, 135mm with expansion rate 173%, and so on. If the expansion rate 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. Therefore, not the desired honeycomb core 11 but the fixed-shape flexible honeycomb core 5 is still used. Belong to the range. Also, when the expansion rate exceeds 173%, the cell wall 15 due to over-expansion
Since the breakage and breakage of the
% Is the limit of the honeycomb core 11.

Further, in the over-expansion for obtaining such a honeycomb core 11, a pin is inserted into each cell 7 of the fixed-shaped flexible honeycomb core 5 or each cell 7 with a constant interval, as in the case of a normal expansion process. After that, it is carried out by applying a tensile force to the entire shaped flexible honeycomb core 5. The honeycomb core 11 thus obtained
Like a general honeycomb core, it has excellent strength-to-weight ratio, lightweight and high rigidity and strength, and also has excellent rectifying effect, heat retention, sound insulation, etc., and has a large surface area per unit volume. It has the characteristics of being, and so on. By the way, as in the present invention, a special corrugated sheet (that is, the cell wall 15 of the honeycomb core 11 in which the large wave portion and the small wave portion of a predetermined shape are sequentially and continuously formed by bending the base material sheet without depending on the overexpansion It is also possible to manufacture a honeycomb corrugated sheet having the same shape as that of the honeycomb core 11 by forming a corrugated plate corresponding to the shape of (1) and forming and stacking and adhering the corrugated sheet.

The honeycomb panel 10 of the present invention is
Honeycomb core 11 obtained by over-expanding in this way
Is used as the core material, and the surface plates 12 are adhered to both surfaces thereof, for example, as shown in FIG. Face plate 1
As the material of 2, the same material as the cell wall 15 of the honeycomb core 11, that is, the cell wall 6 of the fixed shape flexible honeycomb core 5 and the base material sheet of the corrugated plate 13 is often selected and used. Further, the bonding between the honeycomb core 11 and the surface plate 12 is performed by interposing the adhesive agent 14 between them, and after that, the adhesive agent 14 is melted and cured by heating and pressurization. The pressure may be applied at the same time when the honeycomb panel 10 is curved as described later.

The present invention has been described above. Then it becomes as follows. This honeycomb panel 10
Then, the fixed shape flexible honeycomb core 5 (see FIG. 3 (2)) in which each cell 7 has a rounded and substantially convex shape is
Further, the honeycomb core 11 (see (1) and (2) in FIG. 1) overextended from 128% to 173% is
It is used as a core material. The honeycomb core 11, which is 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 that are almost hexagonal.
8 and. Therefore, in the present invention, the following first, second, third and fourth aspects are obtained.

First, in the honeycomb core 11 which is the core material of the honeycomb panel 10, each cell 16 has a special shape as described above, and the 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 with a radius of a predetermined curvature.
It can be freely and easily deformed, and it becomes possible to perform bending with high accuracy. That is, the honeycomb core 11 and the honeycomb panel 10 are curved along the ribbon direction L, which is the bonding direction, or curved in the expansion direction W, which is at a right angle to the ribbon direction L. If the size is small, further, the honeycomb core 11 and the honeycomb panel 1
When the total thickness of 0 is large, or when the honeycomb core 11 has a high density, that is, when the cell size of each cell 16 is small,
Even in the cases such as the above, it is possible to accurately perform a bending process on a curved surface having a predetermined curvature without any trouble. That is, unlike the conventional examples 1, 2, 3, and 4 of FIGS. 7 and 8 described above, there is no hindrance to the bending process into the curved shape.

Further, this honeycomb core 11 is composed of cells 1
Since 6 has the above-mentioned special shape, the difference in shear strength, shear elastic modulus, etc. between the ribbon direction L and the stretching direction W is small, and the difference in rigidity, elasticity, etc. between both orthogonal directions is very small. . Therefore, from this aspect as well, this honeycomb core 1
1 and the honeycomb panel 10 can be accurately curved into a curved surface having a predetermined curvature. That is, as in the conventional example in which the fixed-shape flexible honeycomb core 5 shown in FIG.
It does not hinder the bending process into a curved shape.

For example, FIG. 4 shows the first embodiment of the present invention described above.
The curve processing process of the honeycomb panel 10 of an Example is shown,
(1) is a front view in a state of being interposed between molds 19 having a predetermined curvature, (2) is a sectional view in a curved shape,
(3) FIG. 3 is a perspective view of the same appearance. Thus, the honeycomb panel 10 using the honeycomb core 11 as the core material is
As shown in FIG. 4 (1), heating and pressurization is performed between the molds 19, and drawing is performed to obtain the results shown in FIGS. 4 (2) and 3 (3). As described above, a curved product having a complicated predetermined curvature can be accurately curved. In this case, the honeycomb core 11 is compressed and deformed to have an expansion rate of about 50% in a portion having a small curvature.

Secondly, in the present invention, by these, the honeycomb core 11 and the honeycomb panel 10 are efficiently curved into a curved surface having a predetermined curvature in a short time.
Thirdly, since the honeycomb core 11 is manufactured by over-expansion instead of under-expansion as in the conventional example 2 shown in FIGS. 7 (2) and 7 (3), the honeycomb panel 10 of It does not become heavy. Fourth, since the honeycomb core 11 is manufactured by over-expanding the shaped flexible honeycomb core 5,
The stretching direction W becomes longer, and the ribbon direction L
Will not be significantly shortened. That is, the spreading direction W can be very short as in the conventional example 2 shown in FIGS. 7 (2) and 7 (3), and FIG. 8 (1) shown in FIG.
(2) The ribbon direction L does not become extremely short unlike the conventional example 3 in the figure. Therefore, this honeycomb panel 10 is
When commercializing, the length and width in the spreading direction W and ribbon direction L
There is no big shortage. Honeycomb panel 1 of the present invention
0 becomes the first, second, third and fourth described above.

First, in the honeycomb panel 10 of the first embodiment described above, the honeycomb core 11 and the surface plate 12 are provided.
After they were bonded, they were both curved into a curved surface having a predetermined curvature.
After only 1 is separately curved into a curved surface shape, a flat and flexible surface plate 12 is formed into such a honeycomb core 11
You may make it adhere | attach by curving while covering both surfaces of. Further, the hard surface plate 12 is curved into a curved shape using the same mold 19 or the like, and the surface plate 12 is covered and adhered to both sides of the honeycomb core 11 which has been separately curved into a curved shape. You may do it.

Secondly, FIG. 5 is a front view showing a honeycomb panel 10 of a second embodiment of the present invention in a curved shape. That is, in the above-described honeycomb panel 10 of the first embodiment, the surface plates 12 are provided on both surfaces of the honeycomb core 11.
However, instead of this, as in the case of the honeycomb panel 10 of the second embodiment, the surface plate 12 may be adhered only on one side of the honeycomb core 11 to be curved into a curved surface having a predetermined curvature. Conceivable.

Thirdly, FIG. 6 shows a honeycomb panel 10 of a third embodiment of the present invention, FIG. 1 (1) is an external perspective view,
(2) is an enlarged view of a main part, (3) is a front view of an upside down view, and (4) is a front view in a curved shape. That is, in the above-described honeycomb panel 10 of the first embodiment and the like, no slit 20 or the like is formed in the cell wall 15 of the honeycomb core 11 and the surface plate 12, but in the honeycomb panel 10 of the third embodiment. So as to have a front surface plate 12 adhered on both sides thereof
It is conceivable that slit processing is performed on the cell wall 15 of the honeycomb core 11, which is the core material, from the surface plate 12 side on one side 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 cross in the vertical and horizontal directions are formed, and as shown in FIG. 6 (4), one side where the slits 20 are formed is the inner side and the curved shape is curved. The processing is advantageous in that the bending can be performed more smoothly and with high accuracy.

Fourthly, in the honeycomb panel 10 of each of the embodiments described above, the fixed-shape flexible honeycomb core 5 is overstretched to form a predetermined honeycomb core 11, and then curved processing into a curved surface shape having a predetermined curvature is performed. However, regardless of this, as the honeycomb core 11 that is the core material,
A honeycomb panel 1 having a curved shape by being over-expanded along the mold 19 (see (1) of FIG. 4) is used.
An example in which 0 is set is also possible. In other words, the expansion rate is 100%
The fixed-shaped flexible honeycomb core 5 is over-expanded along a mold 19 having a predetermined curvature to form a honeycomb core 11, and the honeycomb core 11 that is curved and over-expanded into a curved surface shape having a predetermined curvature is used. Then, 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 some extent, the other part is over-expanded from 128% to 173%, and the surface plate 12 conforms to the place described in the above-mentioned 1st, and the honeycomb core is formed in advance. 11 is bonded and curved together, or is separately curved and bonded together. Now, in this embodiment, the honeycomb core 11 as a core material of the honeycomb panel 10 is bent into a curved shape having a predetermined curvature by over-expanding the fixed-shape flexible honeycomb core 5 along the mold 19 having a predetermined curvature. It will be done. Therefore, there is an advantage that the honeycomb core 11 and the honeycomb panel 10 are smoothly and accurately curved.

[0032]

As described above, the honeycomb panel according to the present invention uses the honeycomb core obtained by further expanding the shaped flexible honeycomb core from 128% to 173% as the core material. Be effective.

First, it becomes possible to accurately perform curved processing into a curved surface shape having a predetermined curvature. That is, this honeycomb panel can be accurately curved into a complicated curved surface such as a cubic curved surface without warping, distortion, breakage, peeling, etc., and can be freely and completely formed into a curved surface having a predetermined curvature radius. Can be fitted to. Secondly, it is excellent in processing efficiency and processing time. That is,
This honeycomb panel can be curved to a curved shape having a predetermined curvature efficiently and without taking time.

Thirdly, the weight does not become heavy. That is, the honeycomb core is manufactured without underexpanding, and the weight of the honeycomb panel does not increase. Fourthly, there is no shortage in length or width, and the cost is excellent. That is, when this honeycomb panel is commercialized,
Even with a fixed size, the length and width in the stretch direction and ribbon direction are not significantly short, and the cost is excellent.
As described above, the effects of the present invention are remarkably large, such as the problems existing in this type of conventional example are eliminated.

[Brief description of drawings]

1 shows a first embodiment of a honeycomb panel according to the present invention, (1) is a plan view of the honeycomb core, and (2) is a front view of the honeycomb panel.

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

3A and 3B are provided for explaining a fixed-shape flexible honeycomb core, FIG. 1A is a front explanatory view of a manufacturing process thereof, and FIG. 2B is a plan view of the fixed-shape flexible honeycomb core.

FIG. 4 is a view showing a bending process of the honeycomb panel of the first embodiment, and (1) is a front view showing a state in which the honeycomb panel is interposed between molds;
(2) The figure is a front sectional view of a curved surface, (3)
The figure is a perspective view of the same appearance.

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

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

FIG. 7 shows a honeycomb core that is a core material of a honeycomb panel of this type of conventional example, and FIG. 7 (1) is a plan explanatory view of the conventional example 1.
(2) is a plan view of Conventional Example 2, and (3) is a front view of Conventional Example 2 in a curved shape.

FIG. 8 shows a honeycomb core which is a core material of a honeycomb panel of this type of conventional example, and FIG. 8 (1) is an explanatory plan view of Conventional example 3;
(2) is a side view of Conventional Example 3 in a curved shape, (3) is a plan view of Conventional Example 4, and (4) is
It is a front view of the prior art example 4 in the state made into the curved surface shape.

[Explanation of symbols]

 5 Fixed shape flexible honeycomb core 6 Cell wall 7 Cell 10 Honeycomb panel 11 Honeycomb core 12 Surface plate 15 Cell wall 16 Cell 17 Central part 18 Projection part 19 type L Ribbon direction W Expansion direction

Claims (2)

[Claims] 1. A honeycomb panel in which a surface plate is bonded to a honeycomb core, which is a core material, and the honeycomb core is formed of a planar aggregate of hollow columnar cells, and each cell wall is bent halfway. With each cell wall is adhered together, each cell is shaped into a rounded and substantially convex shaped flexible honeycomb core, which is formed by applying a tensile force in a direction orthogonal to the bonding direction of the cell walls, and 128% to 173
%, The honeycomb core has an obtuse angle between the cell walls and an obtuse angle between the cell walls, and each cell has a rounded and substantially convex shape. A honeycomb panel, which has a special character shape and is composed of 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 overexpanding along a mold having a predetermined curvature, and has a portion partially compressed and deformed to about 50%. The honeycomb panel is characterized by having a curved shape as a whole.