JP3479587B2 - Manufacturing method of honeycomb core for curved surface forming - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for manufacturing a honeycomb core for forming a curved surface. That is, the present invention relates to a method for manufacturing a curved surface forming honeycomb core, which is composed of a planar aggregate of hollow columnar cells and is used for forming a curved surface as various structures.

[0002]

2. Description of the Related Art FIGS. 5, 6 and 7 are provided for explaining a conventional honeycomb core and flexible honeycomb core of this kind. And FIG. 5 (1) is a perspective view of an example of the honeycomb core, and FIG. 5 (2) is a plan view of a main part of another example of the honeycomb core. 6 (1) is a schematic perspective view of the state before the curved surface molding, FIG. 6 (2) is a schematic perspective view of the ideal state after the curved surface molding, and FIG. 6 (3) is a curved surface. It is a schematic perspective view which shows the actual condition after shaping | molding. FIG. 6 is a perspective view of the flexible honeycomb core.

As shown in FIG. 5 (1), the honeycomb core 1 is composed of a planar assembly of hollow columnar cells 3 which are partitioned and formed by cell walls 2 adhered linearly. . As shown in the figure, a cell wall 2 and a cell 3 having a regular hexagonal cross section has been typical from the past, and the cell wall 2 has a straight cross section. By the way, the honeycomb core 1 is provided with characteristics such as excellent weight-specific strength. In view of such characteristics, for example, an outer cylinder / housing of an aircraft engine, a part of an aircraft fuselage, a fuselage or a head of a rocket. Also used for parts, etc. When used in this way, the honeycomb core 1 changes from a flat plate shape as shown in FIG. 6 (1) to a flat plate shape as shown in FIG. 6 (2) or (3). As a whole, a curved surface is formed into a quadric surface and a cubic surface. That is, in this case, the honeycomb core 1 was curved inward and outward so that the cell end faces A and B had a predetermined curvature.

[0004]

By the way, the following problems have been pointed out in such a conventional example. First, the honeycomb core 1 in which the cells 3 shown in FIG. 5 (1) have a regular hexagonal shape is changed from the flat plate shape shown in FIG. 6 (1) to that shown in FIG. 6 (2). As shown in the figure, when a curved surface is formed into a quadric surface such as a cylindrical shape, the cell wall 2
However, it was difficult to form a curved surface ideally as shown in FIG. 6 (2). That is, in this case, the honeycomb core 1 has the structure shown in FIG.
As shown in FIG. 3 (3), the side edge was bulged and the center was recessed, and the entire surface was often warped in a saddle shape, which made it difficult to smoothly form a curved surface. When the cell wall 2 is forcibly twisted and deformed to forcibly form a curved surface, the cell wall 2 is cracked, cracked, sheared, broken, peeled, crushed, buckled, or otherwise damaged. It was easy. As described above, the conventional honeycomb core 1 has a problem in curved surface formability.

Therefore, although the conventional honeycomb core 1 in which the cells 3 have a regular hexagonal shape has been improved, as shown in FIG. The curved surface formability was not sufficient. That is, a conventional honeycomb core 1 in which cells 3 have a regular hexagonal shape is overexpanded and overexpanded until the cells 3 have a horizontally long hexagonal shape has been developed for curved surface molding. However, although this over-expanded honeycomb core 1 can be used for forming a curved surface such as a cylindrical quadric surface along the expansion direction, it does not form a quadric surface along the ribbon direction orthogonal to the expansion direction. Difficulties have been pointed out regarding curved surface molding and curved surface molding into a cubic curved surface such as a sphere. That is, in this case, similar to the case of the honeycomb core 1 in which the cells 3 have a regular hexagonal shape, a curved surface is not smoothly formed, and damage to the cell wall 2 is pointed out. It had been.

Secondly, the flexible honeycomb core 4 shown in FIG. 7 has heretofore been developed. This flexible honeycomb core 4 is a conventional honeycomb core 1 in which the cell walls 2 and the cells 3 described above have a hexagonal cross section.
Instead, the cross-sectional shape of the cell wall 5 and the cell 6 has a special rounded and substantially convex shape, and the cell wall 5 is concavely or convexly bent at one place on the way, which is easy as a whole. And was excellent in curved surface formability to a quadric surface or a cubic surface. That is, the cell end surfaces A and B can be formed into a curved surface relatively easily so that the cell end surfaces A and B have a predetermined curvature. However, regarding this flexible honeycomb core 4, the cell wall 5 and the cell 6 having a special substantially convex shape are formed.
There is a limit to the directional physical properties due to the shape of the
Some problems were pointed out in terms of strength stability. In particular,
There is no problem in the case of a high-density core having an inner diameter of the cell 6 of about 5 mm to 10 mm or less, but in the case of an extremely high-level low-density core, a problem is pointed out in shape retention during heating and pressing during manufacturing. It was

In view of the above situation, the present invention has been made to solve the above-mentioned problems of the prior art, in which the cell wall has concaves and convexes curved from a straight line. Firstly, while being excellent in curved surface formability, secondly,
It is an object of the present invention to propose a method for manufacturing a honeycomb core for curved surface molding, which is excellent in rigidity and strength stability.

[0008]

[Means for Solving the Problems] The technical means of the present invention for solving such problems are as follows. First, claim 1 is as follows. That is, this claim 1
In the method for manufacturing a honeycomb core for forming a curved surface, first, a corrugated sheet is prepared in which substantially triangular corrugated irregularities having a radius are continuously bent and formed. Then, with respect to the corrugated plate, an adhesive is applied to one surface of the corrugated crests or troughs at a pitch of two peaks or two troughs, and at the same time on the other surface of the corrugated troughs or peaks. The adhesive is applied in a stripe shape at an intermediate position of the adhesive applied to.

Then, the corrugated sheet coated with the adhesive in this manner and the corrugated sheet separately prepared and not coated with the adhesive in this manner are alternately positioned so that their tops and valleys are aligned with each other. In relation to each other, and between the corrugated plates coated with the adhesive, a large number of sheets are sequentially stacked in a block shape in a positional relationship corresponding to the coated adhesive. Then, it is heated and pressed to partially bond the corrugated plates with the adhesive in a striation form, and then stretches by applying a tensile force in the stacking direction. As a result, the corrugated plate, which is separated and separated at locations other than the striation-shaped bonding location by the adhesive, is used as a cell wall, and is composed of a planar assembly of hollow columnar cells partitioned and formed by the cell wall. A honeycomb core for forming a curved surface can be obtained. And, in the curved surface-forming honeycomb core thus obtained, the cell walls between the adhering portions do not have a linear cross section, and there are concaves and convexes that are curved inward and outward from the linear shape. , Is characterized.

The second aspect of the present invention is as follows. That is, in the method of manufacturing a honeycomb core for forming a curved surface according to the second aspect of the present invention, first, a corrugated plate is prepared in which substantially triangular corrugated irregularities having a radius are continuously bent and formed. Then, with respect to one of the corrugated plates, an adhesive is applied to one surface of the corrugated crests or troughs at a pitch of every two peaks or every two troughs, and the other corrugated plate has a corrugated trough. The adhesive is applied to one surface of the part or the top in a striation form at a pitch of every two valleys or every two peaks. Then, the corrugated sheet on which the adhesive is applied in this manner and the corrugated sheet on the other side are alternately arranged in a positional relationship in which the top portions and the valley portions are aligned with each other, and
The adhesive applied to one of the corrugated sheets is in the intermediate position of the adhesive applied to the other corrugated sheet, and is applied between the one and the other corrugated sheets. A large number of sheets are sequentially stacked in blocks in a positional relationship corresponding to the adhesive. Then, it is heated and pressed to partially bond the corrugated plates with the adhesive in a striation form, and then stretches by applying a tensile force in the stacking direction. As a result, the corrugated plate is separated and separated at locations other than the strip-shaped adhesive location by the adhesive,
A honeycomb core for forming a curved surface is obtained, which has a cell wall and a planar aggregate of hollow columnar cells partitioned and formed by the cell wall. And, in the curved surface-forming honeycomb core thus obtained, the cell walls between the adhering portions do not have a linear cross section, and there are concaves and convexes that are curved inward and outward from the linear shape. , Is characterized.

The method for manufacturing the honeycomb core for forming a curved surface according to the first and second aspects of the present invention is as follows. In this manufacturing method, while stacking each corrugated sheet,
For example, a honeycomb core for forming a curved surface having corrugated plates as cell walls can be obtained by adhering at a pitch of every two peaks on one surface of the top and at an intermediate position on the other surface of the valley, and then expanding. Then, the thus obtained curved surface forming honeycomb core, the cell wall, due to the remaining shape of the corrugated top and valley of the corrugated plate, there are concave and convex curved without straight section,
The cross-sectional shape of the cell has a shape close to a deformed substantially diamond shape.
The curved surface forming honeycomb core manufactured by this manufacturing method,
Since the cell wall is formed with both the concave and convex portions, the rigidity of the cell wall is reduced accordingly, and the torsional deformation is easy. When forming curved surfaces,
The cell end surface side on the inside / contraction side of the bend is smoothly contracted and deformed, and the cell end surface side on the outside / extension side of the bend is also
Expands and deforms smoothly.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a method for manufacturing a honeycomb core for forming a curved surface according to the present invention will be described in detail based on an embodiment of the invention shown in the drawings. 1, FIG. 2, FIG. 3, and FIG.
Will be used to describe the embodiments of the present invention. 1 (1) is a front explanatory view of the base material sheet, FIG. 1 (2) is a front explanatory view of the corrugated sheet, and FIG. 1 (3) is a wave coated with an adhesive. The front explanatory view of the plates and FIG. 1 (4) are front explanatory views of the stacked corrugated plates. 2 (1) is a front explanatory view of each corrugated plate to be heated and pressed, and FIG. 2 (2) is
It is a front explanatory view of each corrugated plate bonded. FIG. 3 (1) is a plan view of the main part of the obtained curved surface forming honeycomb core,
FIG. 3 (2) is a perspective view of the same curved surface forming honeycomb core. FIG. 4 is used to explain another example of the manufacturing method.
4 (1) is a front explanatory view of one corrugated sheet coated with an adhesive, and FIG. 4 (2) is a front explanatory view of the other corrugated sheet coated with an adhesive. 3) FIG. 3 is a front explanatory view of the stacked corrugated sheets.

In the method for manufacturing the honeycomb core 7 for forming a curved surface according to the present invention, first, the corrugated sheet 8 in which the substantially triangular corrugated irregularities having the radius are continuously bent is prepared.
This will be described in detail. The flat base material sheet 9 shown in FIG. 1 (1) is supplied to a corrugated molding device composed of, for example, a gear, a rack, etc., and is heated and pressed, thereby 2) The corrugated sheet 8 shown in the figure is molded and prepared. As the base material sheet 9 of the corrugated sheet 8, aluminum foil,
Other metal foils, fiber reinforced plastic (FRP) sheets, other plastic sheets, mixed sheets of various fibers, composite sheets containing pulp, synthetic paper, and sheets of various other materials are used. The corrugated sheet 8 is formed by such a base material sheet 9, and the corrugated irregularities having the roundness, that is, the crests 10 and the troughs 11 are linear and parallel in the lateral direction, and are continuously repeated in the longitudinal direction, It is formed by bending at a predetermined pitch and height. And, the corrugated corrugated cross-sectional shape of the corrugated plate 8 had rounded portions at the top portion 10 and the valley portion 11,
It has a substantially triangular shape.

Next, in this manufacturing method, as shown in FIG. 1C, the corrugated top 8 or the trough 11 of the corrugated plate 8 prepared as shown in FIG. On one side, 2
The adhesive 12 is applied in a striation shape at a pitch of every two peaks or every two peaks, and on the other surface of the corrugated valley 11 or top 10,
At the intermediate position of the adhesive 12 applied on one surface, the adhesive 12 is applied in a stripe shape. That is, in the illustrated example, the corrugated plate 8
Adhesive 12 is formed on one surface / upper surface of the top part 10 of the ridge at a pitch of every two ridges / two ridges along the lateral direction in the form of a ridge having a predetermined width.
Is applied. At the same time, with respect to this corrugated plate 8, at the middle position of the adhesive 12 applied every two peaks on the one surface / upper surface, that is, at the position left / right offset / shifted by one and a half halves and one and a half halves. The adhesive 12 is applied to the other surface and the lower surface of the portion 11 along the lateral direction in the form of a strip having a predetermined width. That is, the adhesive 12 on the other surface / lower surface of the valley 11 is applied at a pitch of every two valleys.

Then, in this manufacturing method, as shown in FIG. 1 (4), the corrugated sheet 8 having the predetermined top surface 10 and the bottom surface of the valley 11 thus coated with the adhesive 12 is formed. , The corrugated sheets 8 not separately coated with the adhesive 12 in such a positional relationship that the tops 10 and the valleys 11 are aligned alternately and between the corrugated sheets 8 coated with the adhesive 12 Is the applied adhesive 12
In the positional relationship corresponding to, a large number of sheets are sequentially stacked in blocks. That is, as shown in FIG. 1 (3), a large number of corrugated sheets 8 coated with an adhesive 12 and cut into predetermined lengths, and as shown in FIG. 1 (2), A large number of corrugated plates 8 cut into predetermined lengths without the adhesive 12 being applied
And are alternately stacked in a stacking direction C in the vertical direction. And each corrugated plate 8 is piled up in the positional relationship in which the tops 10 and the troughs 11 are vertically aligned, and
As described above, the corrugated plates 8 coated with the adhesive 12 have a positional relationship in which the coated adhesive 12 vertically corresponds to each other via the corrugated plate 8 on which the interposed adhesive 12 is not coated. ing. In this way, the corrugated plates 8 are densely stacked in a multilayer block shape.

Thereafter, in this manufacturing method, as shown in FIG. 2 (1), heating and pressurization are performed, and each corrugated plate 8 is formed.
The spaces are partially adhered to each other by the adhesive 12 in a striation form. That is, as shown in (4) of FIG. 1 described above, each corrugated plate 8 in which a large number of sheets are stacked in a block shape has
After being interposed, the plate 13 is moved up and down in a furnace or the like to be heated and pressed, and the adhesive 12 applied and interposed is melted and cured. Therefore, the vertical direction is the stacking direction C
Between the corrugated plates 8 that have been piled up as
Bonded at the valley portion 11 in a striation shape.

Then, in this manufacturing method, as shown in FIG. 2 (2), a tensile force is applied in the stacking direction C to carry out expansion. That is, as described above, the corrugated plates 8 that are piled up in a block shape and are partially adhered in a striation shape at the tops 10 and the valleys 11 are, as shown by the arrows in the figure, a vertical stacking direction C. A tensile force is applied vertically with the direction of extension as. As a result, each corrugated plate 8 is bent along the edge of the adhering part except the striation-shaped adhering part by the adhesive 12 and stretched to be vertically separated, separated, and deformed.

In this manufacturing method, the curved surface forming honeycomb core 7 shown in FIGS. 3 (1) and 3 (2) is manufactured by following these steps. In the curved surface forming honeycomb core 7, the corrugated plate 8 separated and separated at locations other than the striation-shaped adhering portions by the adhesive 12 is used as the cell wall 14, and the cells adhered in the striation shape in this manner. It is composed of a planar aggregate of a large number of hollow columnar cells 15 partitioned by the wall 14. And, the cell wall 14 between the bonding points is
Concave that is curved inward and outward from a straight line instead of a straight line 1
6 and convex 17 are present.

The curved surface forming honeycomb core 7 manufactured by this manufacturing method will be described in more detail. The cell wall 14 of the honeycomb core 7 for forming a curved surface is curved because the striation-shaped bonding portion having a width is composed of the top portion 10 and the valley portion 11 of the corrugated plate 8 where the radius is present. . Along with this, the cell wall 14 is
Due to the remaining shape of the corrugated plate 8 due to the extension of the top portion 10 and the valley portion 11, the concave portion 16 and the convex portion 1 that are curved inward and outward from a straight line shape
I have 7. Then, each cell 15 partitioned and formed in the independent space by such a cell wall 14 has a rounded and deformed shape close to a substantially rhombus. Similar to the general honeycomb core 1 (see FIG. 5 (1)), the curved surface forming honeycomb core 7 also has an excellent weight ratio strength, is lightweight, and has high rigidity and strength. It has excellent characteristics such as rectification effect, heat retention, sound insulation, and large surface area per unit volume. In addition, the curved surface forming honeycomb core 7 is also usually provided with open and closed cell end surfaces A,
B is a surface plate (of course, a surface plate having a predetermined curvature)
Are joined and used. The curved surface forming honeycomb core 7 has such a structure.

Here, another example of the method of manufacturing the curved surface forming honeycomb core 7 shown in FIG. 4 will be described.
In the manufacturing method of FIG. 4, instead of the step of applying the adhesive 12 shown in FIG. 1 (3) in the manufacturing method of FIG. 1 and FIG. 2 described above, FIG. As shown in the figure, the adhesive 12 is applied.

More specifically, in the manufacturing method shown in FIG. 4, first, the above-mentioned FIG.
(2) According to the drawing, the corrugated sheet 8 is formed and prepared from the base material sheet 9. Then, unlike the case of FIG. 1 (3) described above, as shown in FIGS. 4 (1) and 4 (2), the waveform of one corrugated plate 8 thus prepared is changed. Top 1
The adhesive 12 is applied to one surface of the valley portion 11 at 0 pitches or at pitches of 2 troughs in a striation form. With this,
With respect to the other corrugated plate 8 on the other side, the adhesive 12 is applied to one surface of the corrugated valley portion 11 or the top portion 10 in a striation form at a pitch of every two valleys or every two peaks. That is, in the illustrated example, as shown in (1) of FIG. 4, one corrugated plate 8 has a pitch of two peaks / two rows on one surface / upper surface of the corrugated top 10 in the lateral direction. The adhesive 12 is applied in a stripe shape having a predetermined width along the line. At the same time, as shown in FIG. 4 (2), the other corrugated plate 8 has a corrugated valley portion 1
The adhesive 12 is applied to one surface / upper surface of 1 at a pitch of every two valleys in a linear shape having a predetermined width along the lateral direction.

Then, in the manufacturing method of FIG.
As shown in FIG. 3C, one corrugated plate 8 and the other corrugated plate 8 coated with the adhesive 12 are alternately
In the positional relationship where the tops 10 and the valleys 11 are aligned,
Also, because the adhesive 12 applied to one corrugated plate 8 is in the intermediate position of the adhesive 12 applied to the other corrugated plate 8,
In addition, between the one and the other corrugated plates 8, a large number of sheets are sequentially stacked in a block shape in a corresponding positional relationship with the applied adhesive 12. That is, in the illustrated example,
As shown in FIG. 4 (1), one corrugated plate 8 having an adhesive 12 applied to one surface / upper surface of the top 10 and a valley 11 as shown in FIG. 4 (2). The other corrugated sheet 8 having the adhesive 12 applied to one surface and the upper surface thereof is alternately stacked in a stacking direction C in the vertical direction. Then, in such a stack, the corrugated plates 8 are first stacked in a positional relationship in which the tops 10 and the valleys 11 are vertically aligned. Further, the adhesive 12 applied to one surface / top surface of the top portion 10 of the one corrugated sheet 8 shown in FIG. 4 (1) causes the trough of the other corrugated sheet 8 shown in FIG. 4 (2). The adhesives 12 applied to one surface and the upper surface of the portion 11 are stacked at a middle position, that is, a relationship in which they are separated from each other by one peak and a half valley and left and right. Along with this, the adhesive applied to each of the corrugated plates 8 shown in FIG. 4A and to the other corrugated plate 8 shown in FIG. 4B. 12 are stacked one on top of the other in a corresponding positional relationship.

In the manufacturing method shown in FIG. 4, the corrugated plates 8 are stacked in a block shape in this manner. As a result, the adhesive 12 in the stacked state shown in FIG. The arrangement positional relationship is similar to that shown in FIG. 1 (4). The manufacturing method of FIG. 4 will be described below with reference to FIG.
(2) According to the steps shown in the figure, the heating, pressurization, bonding, and expansion are carried out to manufacture the above-mentioned curved surface forming honeycomb core 7 of FIG. The details of these are the same as those described above, and the description thereof will be omitted. The manufacturing method of FIG. 4 is as described above.

The method of manufacturing the honeycomb core for forming a curved surface of the present invention is configured as described above. Then it becomes as follows. In this method for manufacturing the curved surface forming honeycomb core 7, the corrugated plates 8 are stacked and, for example, the top portion 10 is formed.
After bonding the two pitches on one surface / upper surface and the valleys 11 on the other surface / intermediate position on the other surface, the corrugated sheet 8 is used as a cell wall 14 by expanding in the stacking direction C. A molding honeycomb core 7 is obtained. Thus, in the curved surface forming honeycomb core 7 manufactured in this way, the cell wall 14 is
Due to the remaining shape of the corrugated top portion 10 and the valley portion 11 of the corrugated plate 8, there is a concave portion 16 and a convex portion 17 that are curved inward and outward from the linear shape without forming a linear sectional shape. The curved cell wall 14 has a rounded and deformed shape substantially close to a rhombus. The curved surface forming honeycomb core 7 manufactured by this manufacturing method has the cell wall 1 thus formed.
Since both the concave portion 16 and the convex portion 17 which are curved in 4 are formed, the rigidity of the cell wall 14 is slightly relaxed by that amount, and the torsional deformation is easy. Now, in the curved surface forming honeycomb core 7 manufactured by this manufacturing method,
It becomes the following first and second.

First, the curved surface forming honeycomb core 7 manufactured by this manufacturing method has a concave portion 16 curved in the cell wall 14.
Since there are convexes 17 and the deformation is easy. Therefore, when the flat plate shape is post-curved (FIG. 6).
(See also Figures (1) and (2)), the cell end surface B side on the inside / contraction side (for example, the lower side) of the curve is smoothly contracted and deformed, and the outside / extension side (for example, the upper side) of the curve. The cell end surface A side of) is also smoothly expanded and deformed. These will be described in more detail. The curved surface-forming honeycomb core 7 shown in FIG. 3 is formed into a flat plate shape as shown in FIG. 3 when the posterior cell end surfaces A and B are formed into a curved surface as a whole inside and outside (for example, above and below). , Like this: That is, at the time of forming a curved surface, the cell 15 on the cell end surface B side on the inner side / contraction side (for example, the lower side) of the curve tends to contract and deform so as to be under-expanded.
The cell 15 on the cell end surface A side on the outer side / extension side (for example, the upper side) of the curved line tries to be expanded and deformed so as to be overextended on the contrary. When forming such a curved surface, the cell walls 14 of the honeycomb core 7 for forming a curved surface are formed with the concave portions 16 and the convex portions 17, respectively, so that the rigidity is relaxed, and there is a margin and cushion against deformation. It has good properties and is easily deformed by twisting. That is, in the cell wall 14 closer to the cell end surface B on the contraction side, the recess 16 and the protrusion 17 contract more, so that the cell 15 on the same side can be smoothly contracted and deformed, whereas the cell wall 14 on the expansion side closer to the cell end surface A. In the cell wall 14, the concave portion 16 and the convex portion 17 are further stretched, so that the cell 15 on the same side can be smoothly stretched and deformed. In this manner, the curved surface forming honeycomb core 7 is smoothly curved.

Second, the curved surface forming honeycomb core 7 manufactured by this manufacturing method has concaves 16 and convexes 1 on the cell walls 14.
However, like the general honeycomb core 1 (see FIG. 5 (1)), the cell walls 14 and the cells 15 have the same vertical and horizontal symmetry in shape as a result of expansion, as described above. Unlike the conventional flexible honeycomb core 4 (see FIG. 7), the cells 6 do not have a special substantially convex shape. Therefore, this curved surface forming honeycomb core 7
Has characteristics according to the characteristics of a general honeycomb core 1. Therefore, it has excellent directional physical properties and is stable in rigidity and strength. For example, even for a low density core having an inner diameter of about 5 mm to 10 mm or more, there is no problem in shape retention during heating and pressing during manufacturing.

In each of the examples shown in FIGS. 1, 2 and 4 described above, the adhesive 12 was applied only to one surface or the other surface of the predetermined top portion 10 and the valley portion 11 of the corrugated plate 8. In addition to this, with respect to the corrugated plate 8 stacked with the corrugated plate 8 as described above, the adhesive 12 may be preliminarily applied to a portion facing such an adhesive 12. In this case, There is an advantage that the adhesion between the corrugated plates 8, that is, the cell wall 14 becomes stronger.

[0028]

As described above, in the honeycomb core for forming a curved surface manufactured by the manufacturing method according to the present invention, the cell wall has concaves and convexes curved from a straight line. The following effects are exhibited.

First, it is excellent in curved surface formability. That is, the honeycomb core for curved surface molding obtained by this manufacturing method has a cell wall having concaves and convexes, so that it is easily twisted and deformed, such as a flat plate shape to a cylindrical shape. The curved surface is smoothly formed into a quadric surface or a cubic curved surface. That is, unlike the honeycomb core of this type of conventional example in which the above-mentioned cells have a regular hexagonal shape, there is no overall saddle-like warping when forming a curved surface into a quadric surface,
In addition, since it is not possible to perform unreasonable twisting deformation and forcible curved surface molding, cracks, cracks, shearing, breakage,
No damage such as peeling, crushing, buckling, etc. will occur.
Further, like the honeycomb core of the conventional example of this kind in which the cells are overextended in the lateral direction, the curved surface can be smoothly formed regardless of whether it is in the expanding direction or the ribbon direction, or in the case of the quadric surface or the cubic surface. To be done. Further, as compared with the above-mentioned conventional flexible honeycomb core of this kind, since there are two concave and convex cell walls, it is more excellent in curved surface formability. Therefore, the honeycomb core for curved surface molding obtained by this manufacturing method is, for example, an outer cylinder / housing of an aircraft engine, while making use of the characteristic that the weight-specific strength is excellent.
It can be used for a part of the fuselage of an aircraft, the body and head of a rocket, a hull, and various other cylindrical and spherical structures.

Secondly, it has excellent rigidity and strength stability. That is, the honeycomb core for curved surface molding obtained by this manufacturing method has, in the cell walls, curved concaves and convexes, but like the general honeycomb core, the cell walls and the cells are vertically and horizontally symmetrical and the same. Unlike the above-mentioned conventional flexible honeycomb core of this kind, it does not have a special substantially convex shape. Therefore, in accordance with a general honeycomb core, it has excellent directional physical properties and stable rigidity and strength, and not only in the case of a high-density core but also in a low-density core, it is the same as a general honeycomb core. Also, the shape-retaining property at the time of heating and pressurizing at the time of manufacturing is secured. in this way,
The effects of the present invention are remarkably large, for example, all the problems existing in this type of conventional example are solved.

[Brief description of drawings]

FIG. 1 is a front explanatory view for explaining a method for manufacturing a honeycomb core for forming a curved surface according to the present invention, in which (1) is a base material sheet and (2) is a corrugated sheet. Fig. 3 (3) shows the corrugated sheet coated with the adhesive, and Fig. 4 (4) shows the corrugated sheets laminated.

2A and 2B are front explanatory views for explaining the embodiment of the present invention, wherein FIG. 1A shows each corrugated plate to be heated and pressed, and FIG. 2B shows each corrugated plate bonded together.

FIG. 3 is a view for explaining the embodiment of the present invention, FIG. 1 is a plan view of a main part of a curved surface forming honeycomb core, and FIG. 3 is a perspective view of the curved surface forming honeycomb core. .

FIG. 4 is a front explanatory view for explaining another example of the embodiment of the present invention, wherein (1) is a corrugated sheet coated with an adhesive, and (2) is an adhesive. The other corrugated sheet coated with is shown in FIG. 3 (3).

FIG. 5 is used to explain a honeycomb core of this type of conventional example,
FIG. 1A is a perspective view of the example, and FIG. 2B is a plan view of a main part of another example.

[Fig. 6] Fig. 6 is a schematic perspective view for explaining a honeycomb core of this type of conventional example, in which (1) is a state before curved surface molding,
FIG. 2 (2) shows an ideal state after forming the curved surface, and FIG. 3 (3) shows the actual state after forming the curved surface.

FIG. 7 is a perspective view of a conventional flexible honeycomb core of this type.

[Explanation of symbols]

1 Honeycomb core 2 Cell wall (conventional example) 3 cells (conventional example) 4 Flexible honeycomb core 5 Cell wall (conventional example) 6 cells (conventional example) 7 Curved surface forming honeycomb core 8 corrugated board 9 Base material sheet 10 top 11 Tanibe 12 Adhesive 13 plates 14 Cell wall (of the present invention) 15 cells (of the present invention) 16 concave 17 convex A cell end face B cell end face C stacking direction

Claims (2)

(57) [Claims] 1. First, a corrugated sheet in which substantially triangular corrugated irregularities with rounded corners are continuously bent is prepared, and two corrugated sheets are formed on one surface of the corrugated top or valley. The adhesive is applied linearly at a pitch of every two or two valleys, and the adhesive is applied linearly to the other surface of the corrugated valley or top at an intermediate position of the adhesive applied to the one surface. After applying the adhesive, the corrugated sheet thus coated with the adhesive and the corrugated sheet separately prepared and thus not coated with the adhesive are alternately positioned so that the tops and the valleys are aligned with each other. In relation to each other, and between the corrugated sheets to which the adhesive is applied, the applied adhesive has a corresponding positional relationship. After partially adhering the corrugated sheets with the adhesive in a striation form, apply tensile force in the stacking direction to expand. The corrugated plate separated and separated by the adhesive other than the striation-shaped bonding part is used as a cell wall, and is composed of a planar aggregate of hollow columnar cells partitioned by the cell wall. A curved surface-forming honeycomb core is obtained, and the thus-obtained curved surface-forming honeycomb core is such that the cell walls between adhering portions do not form a linear cross section, and a concave portion curved inward and outward from a linear shape and A method of manufacturing a honeycomb core for forming a curved surface, characterized in that there is convexity. 2. First, a corrugated sheet in which substantially triangular corrugated irregularities having a radius are continuously bent and formed, and one of the corrugated sheets is provided on one surface of the corrugated top or valley,
The adhesive is applied linearly at a pitch of every two peaks or two troughs, and on the other corrugated sheet, one line of every two troughs or every two peaks is formed on one surface of the corrugated valley or top. After applying the adhesive in a shape of, the one corrugated plate thus coated with the adhesive and the other corrugated plate are alternately arranged so that the tops of the corrugated parts are aligned with each other. The relationship that the adhesive applied to the corrugated sheet is in the intermediate position of the adhesive applied to the other corrugated sheet, and between the one and the other corrugated sheets, Adhesives are stacked one after another in a block-like manner in a corresponding positional relationship, and then heated and pressed to partially bond the corrugated sheets with the adhesive in a striation form, and By applying a tensile force in the stacking direction and expanding, the parts other than the striation-shaped bonded parts by the adhesive are separated and separated. A corrugated sheet is used as a cell wall, and a honeycomb core for curved surface molding is obtained, which comprises a planar aggregate of hollow columnar cells partitioned and formed by the cell wall, and the curved surface molding thus obtained The honeycomb core for use in manufacturing a curved surface forming honeycomb core is characterized in that the cell wall between the bonding points does not have a linear cross section, and there are concaves and convexes curved inward and outward from the linear shape. Method.