JP3335072B2 - Manufacturing method of honeycomb core - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method for manufacturing a honeycomb core. That is, the present invention relates to a method for manufacturing a honeycomb core including a planar aggregate of hollow columnar cells.

[0002]

2. Description of the Related Art FIGS. 6, 7 and 8 are used to describe a method for manufacturing a general honeycomb core according to a conventional example of this kind, and a curved surface forming thereof. That is, FIG. 6 is a schematic perspective view for explaining a general method for manufacturing a honeycomb core. (1) FIG. 6 shows a prepared base material sheet, (2) FIG. 3) shows a base material sheet on which the first bonding material is provided, (4) shows a stacked base material sheet, and (5) shows an expanded base material sheet. FIG. 7 is a perspective view of the honeycomb core manufactured as described above. FIG. 8 provides a description of a case where a honeycomb core manufactured as described above is formed into a curved surface. FIG. 8A is a schematic perspective view of the whole before the curved surface is formed.
(2) is a schematic perspective view of the whole after the curved surface is formed, (3) is a plan explanatory view of the main part after the curved surface is formed, and (4) is a bottom view of the main part after the curved surface is formed.

[0003] First, the honeycomb core 1 is conventionally usually manufactured by the following stretching method. That is, in the method for manufacturing the honeycomb core 1 by the stretching method, first, FIG.
The base material sheet 2 having a predetermined length shown in FIGS.
On the other hand, as shown in FIG. 6 (3), the first joining material 3 such as an adhesive is disposed in a striped manner. Next, (4) in FIG.
As shown in the figure, a plurality of base material sheets 2 are stacked and heated in a positional relationship in which the first bonding material 3 is shifted by a half pitch, and the first bonding material 3 is bonded to each other. Then, as shown in FIG. 6 (5), the honeycomb core 1 was manufactured by applying a tensile force in the stacking direction to expand the core. As shown in FIG. 7, the honeycomb core 1 manufactured in this manner has a hollow columnar shape in which the cell walls 4 are formed by the expanded base material sheet 2, and thus are formed by the cell walls 4. It consists of a planar assembly of cells 5. Then, in the honeycomb core 1 manufactured by the conventional manufacturing method of this type, all of the cell walls 4 have a flat surface with a straight cross section, and each of the cells 5 has, for example, a regular hexagonal shape.

[0004]

However, the following problems have been pointed out in such a conventional manufacturing method. That is, the manufactured honeycomb core 1 is often formed as a whole with a curved surface afterwards so that the cell end surface has a predetermined curvature. It has been pointed out that problems such as cracks, cracks, breakage, peeling, crushing, and buckling are likely to occur.

FIG. 8 is for explaining the curved surface forming of the honeycomb core 1 manufactured by such a conventional manufacturing method, and (1)
When trying to form a curved surface from the flat plate shape shown in the figure to the curved shape shown in FIG. First, as shown in FIG. 3 (3), the regular hexagonal cell 5 on the cell end face side on the inside / shrinkage side (upper side in the drawing) of the curve is formed into a vertically long hexagonal shape (under-expanded) by curved surface forming. And so on). In contrast,
(4) As shown in the figure, the regular hexagonal cell 5 on the cell end face side on the outside / extension side (lower side in the drawing) of the curve is formed into a horizontally long hexagonal shape (over-extended) by curved surface forming. And so on). However, as described above, the contraction and the expansion are hardly performed smoothly due to the stiffness of the cell wall 4 having a flat surface having a linear cross section as described above. If pressure is applied to form a curved surface forcibly, the cell wall 4 may warp as a whole or crack, crack, break, peel, crush,
Damage such as buckling was easy to occur. As described above, it has been pointed out that the honeycomb core 1 manufactured by the conventional manufacturing method has difficulty in flexibility, flexibility, and high shaping property.

[0006] By the way, in order to provide such flexibility, flexibility and high shaping property, conventionally, overexpanded cores and flex cores have been developed. However, first, the over-expanded core, that is, the above-described honeycomb core 1 in which each cell 5 forms a regular hexagonal shape is manufactured by further expanding the above-described honeycomb core, and the over-expanded honeycomb core in which each cell 5 forms a horizontally long hexagonal shape. Deformability in the direction and in the horizontal direction is provided, and although it can be applied to the formation of a curved surface of a secondary curved surface, there is a problem that it cannot be applied to the formation of a curved surface of a complicated cubic surface. Flex core, that is, each cell 5
However, it has been pointed out that a flex honeycomb core manufactured in a specially convex shape with a rounded shape is not easy to manufacture and is costly because the manufacturing method is complicated.

The present invention has been made in view of such circumstances, and has been made in order to solve the above-mentioned problems of the conventional example. In order to form at least one bent portion on a cell wall, the cell wall has a broken line shape. It is characterized by being manufactured. Accordingly, the present invention firstly provides a honeycomb core having excellent flexibility, flexibility, and high shaping property, and secondly, obtains a honeycomb core which can be applied to the formation of a cubic curved surface. Another object of the present invention is to propose a simple and easy method for manufacturing a honeycomb core.

[0008]

The technical means of the present invention for solving such a problem is as follows. First, claim 1 is as follows. That is, this claim 1
In the method for manufacturing a honeycomb core according to the first aspect, first, a first step of arranging a first joining material in a matrix at a constant width and a predetermined interval on a base material sheet, and then, the first joining material is sequentially shifted by a half pitch. A second step of bonding the base material sheets with the first bonding material by stacking and heating a plurality of the base material sheets in a positional relationship, and further pulling the base material sheets in the stacking direction. A third step of applying force to stretch each of the base material sheets. Thus, a cell wall is formed by the expanded base material sheet, thereby obtaining a honeycomb core composed of a planar aggregate of hollow columnar cells defined by the cell wall.

In the manufacturing method of the present invention, in such a manufacturing method, first, in the first step, a second bonding material having a lower bonding strength than the first bonding material is provided between the first bonding materials. ,
At least one wire is disposed in a line parallel to the first joining material,
Next, in the second step, the base material sheets are temporarily joined by the second joining material by piling and heating. Further, in the third step, the temporary joining by the second joining material is peeled off in the middle during the stretching, and the trace is caused by plastic deformation of the base material sheet and the cell between the joining portions by the first joining material. A honeycomb core having a cell wall having a bent line shape is obtained by remaining as a bent portion on the wall.

Further, claim 2 is as follows. That is, the method for manufacturing a honeycomb core according to the second aspect is the same as the method for manufacturing a honeycomb core according to the first aspect.
As the second bonding material having a bonding strength lower than that of the bonding material, a material which is made of the same kind of material as the first bonding material and is set so as to have a lower bonding strength by being narrower than the first bonding material is used. Is characterized.

As described above, in this method for manufacturing a honeycomb core, a temporary bonding method using a second bonding material having a poor bonding force is added to the conventional manufacturing method using the stretching method, and the temporary bonding is peeled off during the expansion. The bent portion is left on the cell wall by utilizing the plastic deformation of the cell. So,
Since the honeycomb core manufactured by this manufacturing method has a bent portion in the cell wall and has a broken line in cross section, the rigidity of the cell wall is reduced from this point, and a margin for deformation is provided and distortion and the like are absorbed. You. Thus, when the honeycomb core manufactured in this manner is formed into a curved surface, the cell end surface side on the inner side / shrinkage side of the curvature is smoothly shrunk and deformed,
The cell end surface on the outer side and the extension side of the curve is also smoothly expanded and deformed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a manufacturing method according to the present invention will be described in detail based on embodiments of the present invention shown in the drawings.
FIG. 1 and FIG. 2 are front explanatory views of a main part for explaining a manufacturing method of a first example of an embodiment of the present invention. FIG. 1A shows a second step of stacking and joining. 1 (2) shows the first half of the third step of expanding, and FIG. 2 shows the third step of expanding.
Shows the latter half of the process. FIG. 3 and FIG. 4 are front explanatory views of main parts used for describing a second example of a manufacturing method according to the embodiment of the present invention. FIG. 3A illustrates a second step of stacking and joining. , FIG. 3 (2) shows the first half of the third step of expansion, and FIG.
Indicates the latter half of the third step of spreading. FIG. 5 is a perspective view of a main part when a curved surface is formed for explanation of the embodiment of the present invention, and FIG. 5 (1) shows a honeycomb core manufactured by the above-described manufacturing method of the first example. FIG. 2B shows a honeycomb core manufactured by a conventional manufacturing method of this kind.

First, referring to FIGS. 6 and 7 described above, a description will be given of a general manufacturing method by the stretching method of this type of conventional example. In this manufacturing method, the following first step, second step, third step
By following the steps, for example, the honeycomb core 1 of this type of conventional example shown in FIG. 7 is manufactured. That is, first,
A first step of arranging the first bonding material 3 in a strip shape at a constant width and an interval on the base material sheet 2, and then a plurality of sheets of the first bonding material 3 in a positional relationship sequentially shifted by a half pitch. By stacking and heating the base material sheets 2, the first base material sheets 2 are separated from each other.
A second step of joining with the joining material 3, and further a third step of extending each base material sheet 2 by applying a tensile force in the direction of stacking;
, The honeycomb core 1 shown in FIG.
Is manufactured. That is, the cell wall 4 is formed by the expanded base material sheet 2, and thus, the manufacturing method according to the conventional example of this type includes a planar aggregate of hollow columnar cells 5 partitioned and formed by the cell wall 4. The manufactured honeycomb core 1 is obtained.

[0014] Such a general production method by the stretching method will be described in more detail. In this manufacturing method, first, as shown in FIG. 6A, a base material sheet 2 is prepared in a preparation step. As the base material sheet 2, aluminum foil or other metal foil, or fiber reinforced plastic (FR
P) Sheets, various plastic sheets, mixed sheets of various fibers, composite sheets containing pulp, and sheets of other various materials are used. The fiber reinforced plastic (FRP) sheet includes glass fiber, Kevlar fiber, carbon fiber, ceramic fiber, metal fiber, resin fiber, other fibers, epoxy resin, polyimide resin, and other thermosetting resin. Typically, a resin or a thermoplastic resin is appropriately selected and combined by adhesion, impregnation, mixing, or the like.

The prepared base material sheet 2 is shown in FIG.
As shown in FIG. 6 (2), after being cut at predetermined lengths in the cutting step, as shown in FIG. 6 (3), in the first step, the first joining is performed in a linear manner. Material 3 is provided. That is, in the first step, the first bonding material 3 is disposed on the base material sheet 2 by applying or the like in a striped shape parallel to the longitudinal direction at a constant width and at a constant interval. An adhesive made of a thermoplastic resin or a thermosetting resin is typical, but a brazing material such as solder can also be used. The cutting step shown in FIG. 6B and the cutting step shown in FIG.
The first step shown in the drawing may be reversed, and the cutting may be performed after the first bonding material 3 is provided.

Then, as shown in FIG. 6D, the plurality of base material sheets 2 on which the first bonding material 3 is provided in the first step are distributed in the second step. The provided first bonding materials 3 are vertically piled up in a positional relationship sequentially shifted by a half pitch. In the second step, the first bonding material 3 is further melt-hardened by heating and pressing,
The stacked base material sheets 2 are joined together. Thereafter, the blocks of the base material sheet 2 stacked and joined in the second step in this manner are cut into predetermined width dimensions, and then the blocks shown in FIG.
As shown in FIG. 5 (5), in the third step, each base material sheet 2 is stretched by applying a tensile force in the upper and lower stacking directions so that the base material sheet 2 Folded along. By following such a first step, a second step, a third step and the like, in the conventional manufacturing method of this kind, for example, as shown in FIG. The honeycomb core 1 is manufactured. The general manufacturing method of this kind by the stretching method of the conventional example is as described above.

Hereinafter, the present invention will be described. In the manufacturing method according to the present invention, the first step, the second step, and the third step are partially added and improved in accordance with the above-described manufacturing method. That is, as shown in FIGS. 1, 2, 3, and 4, in this manufacturing method, first, in the above-described first step, the bonding strength between the first bonding materials 3 is lower than that of the first bonding materials 3. At least one second bonding material 6 is arranged in a line parallel to the first bonding material 3. Next, in the second step described above, the base material sheet 2 is
The space is also temporarily joined by the second joining material 6. Further, in the third step, the temporary joining by the second joining material 6 is peeled off in the middle during the stretching, and the trace is formed on the base material sheet 2 and the cell wall 7 between the joining portions by the first joining material 3 by plastic deformation. The honeycomb core 9 whose cell wall 7 has a bent-line cross section is obtained by remaining as the bent portion 8.

The method for manufacturing the honeycomb core 9 by the stretching method of the present invention will be described in more detail. First, the first step will be described. In the first step, (1) of FIG.
As shown in the drawing and FIG. 3 (1), the first bonding material 3 is disposed on the base material sheet 2 (see also FIG. 6 (3)). Two bonding materials 6 are provided. As the second bonding material 6, a material similar to that described above for the first bonding material 3, such as an adhesive, is used. Like
It is arranged in parallel with the first joining material 3. And the second bonding material 6
Is set so that the bonding strength is inferior to that of the first bonding material 3. For example, the same bonding material as the first bonding material 3 is used, and the bonding power is narrower than the first bonding material 3. Those set to be inferior are used. Of course, regardless of the width of the first bonding material, a material having poor bonding capability such as adhesive strength as compared with the first bonding material 3 is selected and used as the second bonding material 6 regardless of its width. The bonding strength may be set to be lower than that of No. 3.

In the manufacturing method of the first example shown in FIG. 1A, one first material is provided on one side near the first bonding material 3.
A second bonding material 6 that is narrower and narrower than the bonding material 3 is provided. On the other hand, in the manufacturing method of the second example shown in FIG.
A second bonding material 6 narrower than the first bonding material 3 of the book is provided. In addition, regardless of the manufacturing method of the illustrated example, other various positions and numbers of the second bonding material 6 may be arranged. For example, according to the manufacturing method of the first example shown in FIG. 1A, one second bonding material 6 is provided, but the mounting position is near the first bonding material 3. Instead, a manufacturing method in which the first bonding material 3 is disposed at an intermediate position between the first bonding materials 3 may be considered. In this manufacturing method, the first step is as described above.

Next, the second step will be described. Regarding the second step, in the manufacturing method of the first example, FIG.
In the manufacturing method of the example, as shown in FIG. 3A, the base material sheet 2 on which the first bonding material 3 and the second bonding material 6 are arranged is stacked, pressed and heated. , Joined. The base sheets 2 are completely fixedly joined to each other by the first joining material 3 so that they cannot be peeled off. However, depending on the second joining material 6 having a lower joining force than the first joining material 3, Temporarily joined so that it can be peeled off after the fact. In this manufacturing method, the second step is as described above.

Next, the third step will be described. In the third step, ie, the stretching step, as shown in FIG. 1 (2) and FIG. 2 in the manufacturing method of the first example, and as shown in FIG. 3 (2) and FIG. The extension in the stacking direction is performed. At that time, in the first half of this stretching step, as shown in FIG. 1 (2) and FIG. 3 (2), the temporary joining by the second joining material 6 is maintained against the tensile force. However, in the latter half of the stretching process, as shown in FIGS. 2 and 4, the temporary joining by the second joining material 6 is peeled off by the tensile force for stretching. The first bonding material 3 is superior in bonding force to the second bonding material 6, and has a bonding force of such a degree that the first bonding material 3 is not peeled off by such a tensile force.

The second bonding material 6 is peeled off in this way, and the traces of the second bonding material 6 remain as folds 8 in the base material sheet 2 due to plastic deformation. In the manufacturing method of the present invention, the honeycomb core 9 manufactured by the stretching method by following the first step, the second step, the third step, and the like, as shown in FIG. 2 and FIG. The sheet 2 is formed as a planar assembly of hollow columnar cells 10 defined as the cell walls 7, and each cell wall 7 between the joining points does not form a flat surface having a linear cross section (see the honeycomb core of FIG. 7). 1), at least one bent portion 8 exists, and has a cross-sectional bent line shape.

The honeycomb core 9 manufactured by the manufacturing method of the present invention will be described in more detail. In the honeycomb core 9 manufactured by the manufacturing method of the first example shown in FIG. 2, one bent portion 8 is formed on each of the cell walls 7 between the first bonding materials 3 by the first bonding material. 3 is formed on one side. On the other hand, in the honeycomb core 9 manufactured by the manufacturing method of the second example shown in FIG.
The two bent portions 8 are formed one by one near the first bonding material 3. And, like the general honeycomb core 1, the honeycomb core 9 manufactured by this manufacturing method is also excellent in weight ratio strength, light in weight and high in rigidity and strength.
It has strength, is excellent in rectification effect, flatness accuracy, heat insulation, sound insulation, and has a large surface area per unit volume. It is widely used as a structural material.
The honeycomb core 9 manufactured by this manufacturing method is excellent in characteristics, particularly excellent in flexibility, flexibility, and high shaping property.

The present invention is configured as described above. Then, it becomes as follows. In the method for manufacturing the honeycomb core 9, a temporary joining method using a second joining material 6 having a low joining force is used and a plastic deformation after the temporary joining is peeled off during the stretching is used in the production method using the conventional stretching method. Thus, the bent portion 8 is left on the cell wall 7. Thus, in the honeycomb core 9 manufactured by this manufacturing method, since the bent portion 8 exists in the cell wall 7 and the cell wall 7 has a broken line cross section, the rigidity of the cell wall 7 is reduced from this point. In addition, there is room for deformation, and distortion and the like are absorbed. Therefore, the honeycomb core 9 manufactured by this manufacturing method is used.
When a curved surface is formed, the cell end surface side on the inner side and the contraction side of the curve smoothly contracts and deforms, and the cell end surface side on the outer side and the extension side of the curvature also smoothly expands and deforms (see FIG. 5). (See (1) the honeycomb core 9 manufactured by the manufacturing method of the present invention shown in FIG. 5 and the honeycomb core 1 manufactured by the conventional manufacturing method of FIG. 5 (2)).

That is, in the honeycomb core 9 manufactured by the manufacturing method of the present invention, the cell end face has a predetermined curvature,
When the entire surface is formed into a curved surface, the following is obtained. The honeycomb core 9 has a flat plate shape (see also FIG. 8 (1)).
When a curved surface is formed into a curved shape (see also FIG. 8 (2)), the cells 10 on the cell end surface side on the inside / shrinking side of the curve are formed.
Tries to shrink and deform (so that it is under-expanded), and the cell 10 on the cell end face side on the outside / extension side of the curvature is
Attempts to expand and deform (so that it is overstretched).
When forming such a curved surface, the honeycomb core 9 has a margin and a buffering property against deformation at the bent portion 8 of the cell wall 7, the strain is absorbed, the rigidity against bending is reduced, and the bending is performed. The amount of displacement of the portion 8 is different from that of the cell manufactured by the above-described conventional manufacturing method.
8 can be reduced in the vertical and horizontal directions (see also FIG. 8 (3) and FIG. 4 (4)). Therefore, the above-described inner and outer contraction and expansion deformations are smoothly performed. Now, according to the method for manufacturing the honeycomb core 9, the following first, second, and
It becomes the third.

First, the honeycomb core 9 manufactured by this manufacturing method is provided with a margin and cushioning against deformation at the bent portion 8 of the cell wall 7 having a broken line cross section. Therefore,
Since the curved surface is formed smoothly, it is not necessary to apply a particularly large pressing force and pressing force to forcibly deform or expand. Secondly, the honeycomb core 9 manufactured by this manufacturing method is excellent in flexibility, flexibility and high shaping property as described above. Of course, the present invention can be applied to the formation of a curved surface into a cubic curved surface without any trouble. Third, the method for manufacturing the honeycomb core 9 is different from the conventional manufacturing method based on a general stretching method in that a temporary bonding using the second bonding material 6 is added, and the plastic deformation of the peeled trace is reduced. Utilize the cell wall 10
Since the bent portion 8 is left at the end, the operation is simple and easy.

[0027]

As described above, the method for manufacturing a honeycomb core according to the present invention can be performed by manufacturing the cell wall so that at least one bent portion exists and the cross section is formed in a broken line shape. Demonstrate the effect of.

First, a honeycomb core having excellent flexibility, flexibility, and high shaping properties can be obtained. That is, the honeycomb core manufactured by this manufacturing method has a margin and a cushioning property against deformation at a bent portion having a broken line shape of a cell wall, and is smoothly formed into a curved surface, thereby generating a large pressing force and pressure. In addition, there is no need to forcibly deform or expand. Therefore, when the curved surface is formed, unlike the honeycomb core manufactured by the above-described conventional manufacturing method, the cell wall does not warp in a saddle shape as a whole, and cracks, cracks, breakage, peeling, and crushing of the cell wall. , Buckling and other damages are also avoided.

Second, a honeycomb core that can be applied to the formation of a cubic curved surface can be obtained. That is, the honeycomb core manufactured by this manufacturing method is excellent in flexibility, flexibility, and high shaping properties as described above due to the presence of the bent portion of the cell wall having a polygonal cross section, and has a smoothly curved surface. Molded. And, of course, curved surface forming of the quadratic surface,
The present invention can be smoothly applied to the formation of a complicated cubic curved surface without causing a problem as in the above-described conventional over-expanded core.

Third, the manufacturing method is easy. That is, this honeycomb core exhibiting the excellent effects as described above in the first and second aspects is obtained by adding a temporary joining by a second joining material to the conventional manufacturing method by the stretching method, It is obtained by a manufacturing method in which a bent portion is left on the cell wall by utilizing the deformation,
Thus, this manufacturing method is simple and easy. That is,
Unlike the above-described conventional method for manufacturing a flex core, the manufacturing method is not complicated, and the manufacturing process is excellent in cost. As described above, the effects exhibited by the present invention are remarkable and large, for example, all the problems existing in this type of conventional example are solved.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front explanatory view of a main part of a method for manufacturing a honeycomb core according to the present invention, which is used for describing a manufacturing method according to a first embodiment of the present invention; FIG. 2B shows the first half of the third step of expanding.

FIG. 2 is an explanatory front view of a main part used for describing a manufacturing method according to a first example of the embodiment of the present invention, showing a latter half of a third step of expanding.

FIG. 3 is an explanatory front view of a main part for explaining a manufacturing method according to a second example of the embodiment of the present invention;
FIG. 2B shows the first half of the third step of expanding the second step of joining.

FIG. 4 is an explanatory front view of a main part used for describing a manufacturing method according to a second example of the embodiment of the present invention, showing the latter half of a third step of expanding.

FIG. 5 is a perspective view of a main part when a curved surface is formed for explanation of the embodiment of the present invention, and FIG. 5 (1) shows a honeycomb core manufactured by the manufacturing method of the first example described above. ,
(2) FIG. 2 shows a honeycomb core manufactured by a conventional manufacturing method of this kind.

FIG. 6 is a schematic perspective view for explaining a method for manufacturing a general honeycomb core, in which (1) FIG. 6 shows a prepared base material sheet, and (2) shows a cut base material sheet; (3) FIG. 3 shows a base material sheet on which the first bonding material is provided, (4) FIG. 4 shows a stacked base material sheet, and (5) FIG. 5 shows an expanded base material sheet. Show.

FIG. 7 is a perspective view of a honeycomb core manufactured by a conventional manufacturing method of this kind.

FIG. 8 is provided for explanation of a case where a honeycomb core manufactured by the manufacturing method of the same type of the related art is formed into a curved surface; FIG. 8 (1) is a schematic perspective view of the whole before the curved surface is formed, and FIG. FIG. 3 (3) is an explanatory plan view of a main part after the curved surface is formed, FIG. 4 (4) is a bottom view of the main part after the curved surface is formed, and FIG.

[Explanation of symbols]

Reference Signs List 1 Honeycomb core (manufactured by conventional manufacturing method) 2 Base material sheet 3 First joining material 4 Cell wall (manufactured by conventional manufacturing method) 5 Cell (manufactured by conventional manufacturing method) 6 Second joining material 7 Cell wall (manufactured by the manufacturing method of the present invention) 8 Folded portion 9 Honeycomb core (manufactured by the manufacturing method of the present invention) 10 Cell (manufacturing method of the present invention) Manufactured in)

Claims (2)

(57) [Claims] First, a first step of arranging a first bonding material in a matrix at a constant width and a predetermined interval on a base material sheet, and then, a positional relationship in which the first bonding material is sequentially shifted by a half pitch. And stacking and heating a plurality of the base material sheets, thereby bonding the base material sheets with the first bonding material, and further applying a tensile force in the stacking direction. And a third step of expanding each of the base material sheets, whereby cell walls are formed by the expanded base material sheets, and thus, the planes of hollow columnar cells partitioned and formed by the cell walls are formed. In the method for manufacturing a honeycomb core for obtaining a honeycomb core composed of a target aggregate, first, in the first step, a second bonding material having a lower bonding strength than the first bonding material is interposed between the first bonding materials. 1 At least one wire is arranged in parallel with the joining material, and then, in the second step, by stacking and heating, The base material sheets are also temporarily joined by the second joining material. Further, in the third step, the temporary joining by the second joining material is peeled off during the stretching during the stretching, and traces of the temporary joining are caused by plastic deformation. A honeycomb core is obtained in which the cell wall between the joints made by the first joining material has a bent-line cross section by remaining as a bent portion on the base material sheet and the cell wall between the joints made by the first joining material. And a method for manufacturing a honeycomb core. 2. The method for manufacturing a honeycomb core according to claim 1, wherein the second bonding material having a lower bonding force than the first bonding material is made of the same material as the first bonding material and the first bonding material.
A method for manufacturing a honeycomb core, characterized in that a material which is narrower than a bonding material and is set so as to have a lower bonding strength is used.