JPH10156983A - Curved surface honeycomb core and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a honeycomb core to be molded into a curved surface easily which prevents the damage to cell walls, overall warpping and the like and which is provided with superior strength and can be applied to various kinds of curved surface moldings and manufactured simply at the reasonable cost, and also provide a manufacturing method thereof. SOLUTION: A curved surface honeycomb core is molded being curved inside and outside at a given curvature, and respective bonding sections 11 are formed into the tapered and vertically long trapezoid shape, wide inside and narrow outside the curving. When the honeycomb core is manufactured, bonding materials 9 such as bonding agents are provided at a given pitch in the tapered and vertically long trapezoid shape and almost into the linear shape on a matrix sheet 10, and then a number of matrix sheets 10 are overlapped with respective bonding materials 9 shifted by half pitch, heated and pressurized to bond respective matrix sheets by respective bonding materials 9. Then the tensile force is applied in the overlapping direction and stretching is carried out to manufacture a curved surface honeycomb core with the matrix sheets 10 used as cell walls.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a curved honeycomb core and a method for manufacturing the same. That is, the present invention relates to a curved honeycomb core which is formed of a planar aggregate of hollow columnar cells, is formed into a curved surface inside and outside, and is used as various structural materials, and a method for manufacturing the same.

[0002]

2. Description of the Related Art FIGS. 3, 4 and 5 are provided for explanation of a honeycomb core according to a conventional example of this kind, a method of manufacturing the same, and a curved surface forming thereof. That is, FIG. 3 is a schematic perspective view for explaining a method for manufacturing a honeycomb core of this type of conventional example, and (1)
The figure shows the base material sheet, the figure (2) shows the state in which the joining material is arranged, the figure (3) shows the cut state, the figure (4) shows the stacked state and the joined state, and the figure (5) shows the expanded state. It shows the state where it was done. FIG.
It is a perspective view of the manufactured honeycomb core. FIG. 5 (1)
The figure is a schematic perspective view before forming a curved surface, and FIG.
(3) is a plan view of another example of a main part,
FIG. 4D is a schematic perspective view after the curved surface is formed, and FIG. 5F is a schematic perspective view after the curved surface is formed.

First, the conventional honeycomb core 1 is usually manufactured by the following stretching method. That is, in the method for manufacturing the honeycomb core 1 by the stretching method, first, as shown in FIG. 3 (2), bonding of an adhesive or the like is performed on the base material sheet 2 shown in FIG. 3 (1). The materials 3 were arranged at a constant pitch in a strip with a constant width. That is, the bonding material 3 is conventionally applied to the belt-shaped base material sheet 2 in the form of a stripe parallel to the strip-shaped base material at a constant width and pitch along the short direction, that is, a long rectangular shape, for example, and repeatedly applied in the longitudinal direction. It was arranged by. Then, as shown in FIG. 3 (3), after cutting the base material sheet 2 at a fixed length, as shown in FIG. 3 (4), a large number of base material sheets 2 are cut. The joining members 3 are stacked in a positional relationship shifted by a half pitch, and are heated and pressed to join each other. And FIG.
As shown in FIG. 5 (5), by applying a tensile force in the stacking direction A and expanding the sheet, it is bent along the edge of each joint by each joining material 3 and at the same time other than each joint. The honeycomb core 1 composed of a planar aggregate of hollow columnar cells 5 partitioned by the cell wall 4 was manufactured using the base material sheet 2 separated and isolated from the cell wall 4.

As shown in FIGS. 3 (5), 4 and 5 (1), etc., the cell wall 4 and the cell 5 have a regular hexagonal cross section as shown in FIG. The honeycomb core 1 to be formed is used after being formed into a curved surface inside and outside so that the cell end surfaces 6 and 7 have a predetermined curvature as shown in FIG. 5 (4) and FIG. 5 (5). There are many. That is, the honeycomb core 1 has characteristics such as excellent strength by weight. In view of such characteristics, for example, the outer cylinder / housing of an aircraft engine, a part of the fuselage of an aircraft, the fuselage or head of a rocket, etc. When it is used for a part or the like, as shown in FIG. 5 (4) and FIG. It is formed into a curved surface or a cubic curved surface.

[0005]

The following problems have been pointed out in such a conventional example. First, it was pointed out that a curved surface was not easily formed. That is, the conventional honeycomb core 1 is sandwiched between jigs such as upper and lower curved surface irregularities or between a curved concave shape and a roll, and pressurized so as to adjust to a predetermined curvature. When the curved surface was formed such that the cell end face 7 side was elongated and deformed, the rigidity of the cell wall 4 which had been entirely formed into a flat plate shape was hindered, and the curved surface was hardly formed. That is, the honeycomb core 1 before the curved surface forming has a flat plate shape,
Although excellent in compressive strength and other stiffness and strength in the cell axis direction, they hindered the formation of a curved surface, and it was not easy to form the curved surface.

By applying a large pressing force or repeatedly applying a pressing force, the cell wall 4 is forcedly deformed against the rigidity of the cell wall 4, and if the cell wall 4 is to be forcibly shaped, the cell wall 4 is forced to be deformed.
Cracking, cracking, shearing, breakage, peeling, crushing, buckling, etc., were likely to occur. Further, as shown in FIG. 5 (4), the curved surface is not accurately formed, and as shown in FIG. 5 (5), the whole end rises and the center is recessed, and the whole becomes saddle-shaped. Often it became a warped deformed product. In particular, the high-density core, that is, the honeycomb core 1 in which the diameter of the cell 5 is 3 mm or less has high rigidity, and such damage and deformed products are easily generated. As described above, when the conventional honeycomb core 1 is formed into a curved surface, a problem in quality tends to occur.

Second, problems have been pointed out in terms of strength. That is, the flat plate-shaped honeycomb core 1 before the curved surface is formed has a relationship in which the cell axis direction is orthogonal to the cell end surfaces 6 and 7, and therefore, as described above, generally the rigidity and the
It has the property of being excellent in strength. However, when such a honeycomb core 1 is formed into a curved surface, the inner cell end surface 6 side is forcibly contracted and deformed, and the outer cell end surface 7 side is forcibly expanded and deformed. Therefore, the cell end surface curved to a predetermined curvature. The cell axis directions are not orthogonal to the cells 6 and 7, that is, the normal direction and the cell axis direction do not match. Accordingly, the conventional honeycomb core 1 having a curved surface is reduced in its rigidity and strength, particularly its rigidity and strength against a compressive load applied in the normal direction.
Anxiety was pointed out about strength.

Thirdly, an overexpanded honeycomb core or the like which has been further expanded has been developed for such a conventional honeycomb core 1, but the curved surface formability was not sufficient. That is, the honeycomb core 1 manufactured by the above-described stretching method and having the cross-sectional shape of the cell wall 4 and the cell 5 forming a regular hexagon as shown in FIG.
Furthermore, the cross-sectional shape of the cell wall 4 and the cell 5 is obtained by being over-expanded or stopped in an unexpanded / semi-expanded state.
As shown in FIGS. (2) and (3), overexpanded honeycomb cores and underexpanded honeycomb cores having a hexagonal shape close to a horizontally long or vertically long rectangle have also been developed.

However, these are applicable to the formation of a curved surface with a quadratic surface in the extending direction due to the shape of the cell wall 4 and the cell 5, but the curved surface is formed in the ribbon direction perpendicular to the extending direction. Also, it is not applicable to curved surface forming with a complicated cubic surface. In other words, the hexagonal shape of the cell wall 4 and the cell 5, which is close to a rectangle, hinders the bending in the ribbon direction and acts to regulate the bending. The curved surface formability in the ribbon direction was inferior to the hexagonal honeycomb core 1. As described above, the overexpanded honeycomb core and the like did not have sufficient curved surface formability. Furthermore, the over-expanded honeycomb core and the like have a rigidity and a rigidity due to the fact that they have a substantially rectangular shape, compared to the above-described honeycomb core 1 in which the cross-sectional shapes of the cell walls 4 and the cells 5 are regular hexagons. It was also pointed out that the strength was greatly reduced.

Fourth, a flexible honeycomb core having a special shape has been developed in place of the conventional honeycomb core 1 shown in FIG. 4 and the like, but a great problem has been pointed out in terms of cost. That is, the cell wall 4 and the cell 5 described above
Instead of the honeycomb core 1 having a regular hexagonal cross section,
A flexible honeycomb core, also called a Mexican hat type, in which the cross-sectional shape of the cell wall 4 and the cell 5 has a special rounded special substantially convex shape, has also been developed. And, although this flexible honeycomb core is easy to form a curved surface, it is not always manufactured by a general stretching method, but the manufacturing method is special and complicated, and the manufacturing equipment is dedicated and complicated. It was pointed out that there were major difficulties in terms of cost, such as cost. Further, this flexible honeycomb core has a rigidity / strength due to the fact that these have a substantially convex shape as compared with the above-mentioned honeycomb core 1 in which the cross-sectional shape of the cell wall 4 and the cell 5 is a regular hexagon. Has also been pointed out.

The present invention has been made in view of such circumstances, and has been made to solve the above-mentioned problems of the prior art. In the present invention, each of the provided bonding materials and each of the bonding portions between the cell walls are tapered. First, by forming a vertically long trapezoidal shape, it is easily formed into a curved surface, damage to the cell wall and overall warpage are prevented, second, excellent strength, third, and moreover, Fourthly, it is an object of the present invention to propose a curved honeycomb core and a method for manufacturing the same, which can be applied to various types of curved surface forming, can be easily manufactured, and are excellent in cost.

[0012]

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
Is a planar aggregate of hollow columnar cells defined by cell walls, the cell end surfaces of which have a predetermined curvature and are formed into a curved surface inside and outside, and each joining portion between the cell walls However, it is characterized in that it has a vertically elongated trapezoidal shape with a tapered width that is wide on the inner cell end face side along the cell axis direction and narrow on the outer cell end face side.

Next, claim 2 is as follows. That is, the manufacturing method according to claim 2 relates to a method for manufacturing a curved honeycomb core in which a cell end surface has a predetermined curvature and is formed into a curved surface inside and outside. First, a base material sheet is prepared, in which a bonding material such as an adhesive is disposed in a tapered vertically trapezoidal shape having a wide end at one end and a narrow width at the other end, and is disposed at a constant pitch in a substantially linear manner. Next, a large number of the base material sheets are stacked in a positional relationship in which the joining materials are shifted by a half pitch, and are heated and pressed to join each other with the joining materials. Then, by applying a tensile force in the stacking direction and expanding the base material sheet, the base material sheet that is bent along the edge of each joint by each of the joining materials and that is separated from other than the joining portions is separated from the cell wall. The cell wall is formed of a planar assembly of hollow columnar cells partitioned and formed by the cell walls, and the cell end faces are formed such that one end side of each joint portion between the cell walls by each of the joining materials is inside and the other end side is inside. A curved honeycomb core having a predetermined curvature on the outside and having a curved surface formed on the inside and outside is obtained.

Thus, in this curved honeycomb core,
Each joint between the cell walls forms a vertically elongated trapezoidal shape with a tapered shape wide inside and narrow outside on the inside of the curve, and is formed from inside to outside with a predetermined curvature from the beginning. Then, after the joining material is disposed on the base material sheet in a tapered vertical trapezoidal shape, substantially linearly at a constant pitch, the spreading method of stacking, joining, and extending is carried out to obtain a predetermined curvature. It is manufactured by forming a curved surface in advance.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments of the invention shown in the drawings. 1 and 2
Is provided for describing the embodiment of the present invention. And FIG.
FIG. 1A is a plan view of a base material sheet, FIG. 2B is a plan view in which a joining material is provided, and FIG.
(4) The figure is a perspective view immediately before the expansion. 2A is a schematic perspective view of the expanded curved honeycomb core, FIG. 2B is a perspective explanatory view of a main part, and FIG. 2C is a plan explanatory view of a bonding material and a bonding part.

First, a method for manufacturing the curved honeycomb core 8 according to the present invention will be described. This manufacturing method is based on a so-called stretching method. First, a bonding material 9 such as an adhesive is used.
However, a base material sheet 10 having a tapered vertical trapezoidal shape with one end side being wide and the other end side being narrow is provided at a constant pitch in a substantially linear manner.

These will be described in more detail. First, as the base material sheet 10 shown in FIG. 1A, as in the above-described conventional example of FIG. 3, an aluminum foil, another metal foil, a fiber reinforced plastic (FRP) sheet,
In addition, various types of plastic sheets, mixed sheets of various fibers, composite sheets containing pulp, synthetic paper, and other thin sheets of various materials are used. As the joining material 9, an adhesive is typically used, but a brazing material or the like can also be used. As shown in FIG. On the surface of the prepared strip-shaped base material sheet 10, coating and transfer are repeated at a predetermined pitch at predetermined intervals in the longitudinal direction along the short direction in substantially the same tapered vertically long trapezoidal substantially linear shape. , Printed, etc. Then, the bonding material 9, such as the adhesive, the base material sheet 10 forming the strip, the width (hereinafter simply referred to as end width L ₁₎ is wide on one side end side of the side (right side in the drawing), (in the drawing the left side) the other end side of the side width (hereinafter simply referred to as the other end width L ₂₎ is narrow, but is arranged in a tapered elongated trapezoidal, further later described in detail this I do.

Next, in this manufacturing method, the base material sheet 10 on which the respective bonding materials 9 are provided is cut along the transverse direction at predetermined lengths in the longitudinal direction. Then, a large number of base material sheets 1 thus cut into predetermined lengths
0 is a positional relationship in which each bonding material 9 is shifted by a half pitch,
While being piled up, each joining material 9
Is joined.

These will be described in more detail. As shown in FIG. 1 (3), and similarly to the above-described conventional example of FIG. 3, the base material sheet 10 is cut into a predetermined length, and then a large number (for example, 400 sheets). From 2,0
(Approximately 00 sheets) are stacked vertically in a positional relationship in which the bonding materials 9 arranged in a substantially linear shape are sequentially shifted left and right by half a pitch. Then, the base material sheet 10 thus stacked
Is heated and pressurized, whereby each bonding material 9 such as an adhesive interposed between the respective base material sheets 10 is melt-hardened, and the stacked base material sheets 10 are bonded by bonding or the like, The whole is 1
Blocks.

Then, in this manufacturing method, such a block body of each base material sheet 10 is pulled in the stacking direction A as shown in FIG. 1 (4) and FIG. 2 (1). Power is applied and spread. As a result, the curved honeycomb core 8 according to the present invention having a curved surface is manufactured.

That is, the curved honeycomb core 8 is bent along the edge of each joint portion 11 by each joining material 9 by stretching, and the base material sheet 10 in which portions other than each joint portion 11 are separated and separated. Is a cell wall 12, and is formed of a planar aggregate of a large number of hollow columnar cells 13, each of which is partitioned and formed in an independent space by such a cell wall 12. The curved honeycomb core 8 has one end of each joint 11 between the cell walls 12 formed by the joining materials 9 as an inner cell end surface 14 and the other end of each joint 11 formed by the joining materials 9. To
Outer cell end faces 15, and thus cell end faces 14, 15
Has a predetermined curvature and is formed into a curved surface inside and outside. And
Each joint portion 11 between the cell walls 12 has a tapered vertical trapezoidal shape along the cell axis direction and having a width narrower toward the inner cell end surface 14 and narrower toward the outer cell end surface 15. Such a joint 1
1 will be described in further detail later. The curved honeycomb core 8 manufactured in this manner is also excellent in weight ratio strength, is lightweight, has high rigidity and strength, and is rectified, like the general honeycomb core 1 (see FIG. 4 and the like). It is excellent in effect, heat retention, sound insulation, and has a large surface area per unit volume. This curved honeycomb core 8
Usually, the surface plates are joined to the open and closed cell end surfaces 14 and 15, respectively, and are provided for use.

Next, each of the bonding materials 9 and the bonding portions 1 described above will be described.
1 will be described in more detail. That is, for each of the joining materials 9 arranged in a tapered vertical trapezoidal shape according to the present invention, and for each joining portion 11 of such joining materials 9, FIG. 2 (2) and FIG. This will be described in further detail with reference to FIG. 2, and further to FIG. 2 (1) and FIG. 1 (2). First, each bonding material 9 has one end width L _{1 of the} base material sheet 10.
The length relationship is set so that> the other end width L ₂ (of course, one end width L ₁ <the other end width L ₂ is also possible). On the other hand, in the conventional example of this type shown in FIG. 3 described above, each joining material 3 is one end width L ₁ = the other end width L of the base material sheet 2.
_The length relationship was set to be ₂ . In the present invention, the length relationship is set such that the width of one end L ₁ on the inner cell end face 14> the other end width L ₂ on the outer cell end face 15 side of the cell wall 12 is also established. (Of course, one end width L ₁ <the other end width L ₂ is also possible).

Then, as shown in FIG. 2 (3),
Intermediate value between the end width L ₁ and the other end width L _2, that is one end width L ₁ and the other end width L ₂ and the length of the parallel center line of the joining material 9, and each joint 11 and the cell walls The length of the center plane section of No. 12 is a center width L. The length of the base material sheet 10 in the lateral direction, that is, the length between the cell end surfaces 14 and 15 of the cell wall 12 is defined as a line length T. Further, for the bonding material 9 forming a vertically long trapezoid, eggplants exterior angle of the narrow second end width L ₂ of the side and inclined side of the angle theta. Further, as shown in FIG. 2B, the required radius of curvature of the curved honeycomb core 8 is R. Incidentally radius of curvature R denotes the radius of curvature R ₁ of the inner cell edge face 14 is an intermediate value of the radius of curvature R ₂ of the outer cell edge 15, the radius of curvature of the central section of the cell walls 12 and the cell 13 . Now, such one end width L ₁ , other end width L ₂ , center width L, striation length T, angle θ,
The following formulas 1 and 2 are established between the curvature radii R and the like.

[0024]

L = L ₁ −T / TANθ

[0025]

## EQU2 ## R = TANθ / 8 × ｛3L + SQR (9L ² −
16T ² / TAN ² θ)｝

Therefore, with respect to the curved honeycomb core 8, for example, the angle θ and the central width are calculated by the above-described formulas 1 and 2 on the assumption that the required predetermined curvature and radius of curvature R and the length of the striations T are used. L and the end width L ₁ and the other end width L ₂ numbers, is specifically calculated, can be determined. That is, in the curved honeycomb core 8, according to a required predetermined curvature, each of the joining materials 9 having a tapered vertical trapezoidal shape disposed on the base material sheet 10 has one end width L ₁ or the like. by specifically specify a number of other end width L _2, leading to the curved surface shaped as a desired. That is, by forming each bonding portion 11 between the cell walls 12 with such bonding materials 9, the cell end surfaces 14 and 15 have a predetermined curvature, and the curved honeycomb core 8 having a curved surface formed inside and outside is formed. can get. In Equation 2, SQR (9L ² -16T ² / T
AN ² θ) is, of course, the root (9L ² -16T ² / T
AN ² θ).

The present invention is configured as described above. Then, it becomes as follows. Thus, in this curved honeycomb core 8, each joint 11 between the cell walls 12 is
It has a vertically long trapezoidal shape with a tapered shape wide inside and narrow outside on the inside of the curve, and is formed into a curved surface inside and outside with a predetermined curvature from the beginning.
Then, after each bonding material 9 is disposed on the base material sheet 10 in a tapered vertically trapezoidal shape at a constant pitch substantially linearly, the stacking,
By carrying out the stretching method of joining and stretching, a curved surface is formed at a predetermined curvature in advance, and the device is manufactured. Well there,
The curved honeycomb core 8 and the curved honeycomb core 8 manufactured by this manufacturing method are as described in the following first, second, third, and fourth.

First, the curved honeycomb core 8 is formed by arranging the joining materials 9 on the base material sheet 10 in a tapered, vertically long trapezoidal shape, and performing the stretching method, so that each of the curved honeycomb cores 8 is formed between the cell walls 12. Similarly, the joint portion 11 has a tapered vertical trapezoidal shape, and the cell end faces 14 and 15 are formed into curved surfaces inside and outside. That is,
It is manufactured naturally and easily in a state where it has been previously formed into a curved surface by the stretching method, and since no jig such as a curved surface uneven shape or a roll is used for forming the curved surface, no excessive pressing and deformation is performed. , Smoothly formed on a curved surface.

Secondly, in the curved honeycomb core 8, the cell wall 12 and the cell 13 have a regular hexagonal cross section at the center cross section and a slightly vertically long hexagonal shape at the inner cell end face 14 side. (See FIG. 5 (3) described above.) On the outer cell end surface 15 side, a slightly elongated hexagonal shape is formed (see FIG. 5 (2) described above). As described above, since the entire base / center plane has a regular hexagonal shape, the characteristic of the honeycomb core 1 (see FIG. 4) of being excellent in rigidity and strength is hardly impaired. That is, the regular hexagonal shape of the cell wall 12 and the cell 13 which is considered to be the most excellent in rigidity and strength is basically maintained. In addition to this, the normal direction of the cell end faces 14 and 15 curved to a predetermined curvature and the cell axis direction which is the axial direction of the cell 13 are:
Since they match, the rigidity and strength, especially the rigidity and strength against a compressive load applied in the normal direction, are also excellent from this aspect.

Third, the curved honeycomb core 8 has a parallel one end width L ₁ and the other end parallel to each of the joining members 9 and the joining portions 11 between the cell walls 12 arranged in a tapered vertically trapezoidal shape. such as by specifically specify a number of widths L _2, freely and appropriately include the predetermined curvature is obtained. Further, in the curved honeycomb core 8, the central cross section of the cell wall 12 and the cell 13 has a regular hexagonal shape, which may be the entire base / center plane, and only in the extending direction (stacking direction A). Instead, it can be freely curved in the ribbon direction orthogonal to this. Further, a curved surface is formed into a cubic curved surface as well as a secondary curved surface.

Fourthly, this curved honeycomb core 8 is formed by arranging each joining material 9 on a base material sheet 10 in a tapered vertically long trapezoidal shape, and then stacking, joining, and extending it. By performing the above, the manufacturing can be easily performed, and no special equipment is required for the manufacturing.

[0032]

As described above, the curved honeycomb core and the method of manufacturing the same according to the present invention are arranged such that each of the joint members provided and each joint portion between the cell walls have a tapered vertical trapezoidal shape. By doing so, the following effects are exhibited.

First, it is easily formed into a curved surface, so that damage to the cell wall and overall warpage are prevented. That is, in this curved honeycomb core, each bonding material is disposed on the base material sheet in a tapered vertical trapezoidal shape, and by performing the stretching method, each bonding portion between the cell walls is tapered in a vertical trapezoidal shape. And a cell end face having a predetermined curvature and being formed into a curved surface inside and outside. That is, it is manufactured naturally and easily in a state where it has been formed into a curved surface in advance.

As described above, as in the above-described conventional example, a flat plate-shaped honeycomb core is manufactured, and then a curved surface is formed by forcibly pressurizing and deforming the same by using a jig such as a curved surface uneven shape or a roll. Therefore, the occurrence of damage such as cracking, cracking, shearing, breakage, peeling, crushing, buckling, and the like on the cell wall can be avoided. Furthermore, the curved honeycomb core manufactured by this manufacturing method and the curved honeycomb core manufactured by this manufacturing method are excellent in quality, for example, a deformed product that is entirely warped in a saddle shape is avoided. Note that this point also applies to a high-density core, that is, a curved honeycomb core having a cell diameter of 3 mm or less.
The same is achieved without any change.

Second, it is also excellent in strength. That is, since the curved honeycomb core and the curved honeycomb core manufactured by this manufacturing method have a regular hexagonal cross section of the cell wall and the central section of the cell, and this is the entire base / center plane, the cell wall and The rigidity and strength are superior to the above-described conventional over-expanded honeycomb cores and flexible honeycomb cores in which the cross-sectional shapes of the cells are all substantially rectangular or substantially convex. Further, since the cell axis direction is always orthogonal to the cell end face curved to a predetermined curvature, and the normal direction and the cell axis direction coincide with each other, the cross-sectional shape of the cell wall and the cell has a regular hexagonal shape. The honeycomb core of the above-described conventional example is superior in rigidity and strength as compared with a honeycomb core formed afterwards by a curved surface forming.

Third, the present invention is applicable to various types of curved surface forming. That is, the curved honeycomb core and the curved honeycomb core manufactured by this manufacturing method are designed to specify numerical values of one end width and the other end width with respect to each bonding material disposed in a tapered shape and each bonding portion between cell walls. Thus, the curvature can be freely and appropriately set to a predetermined value, and thus can be applied to various curved surface forming.

Further, the cell wall and the central section of the cell form a regular hexagonal shape, which may be the entire base / center plane. As in the above-described conventional over-expanded honeycomb core, etc. Not only the extension direction,
Furthermore, it can be freely curved in the ribbon direction, and can be formed not only into a secondary curved surface but also into a more complicated tertiary curved surface. Therefore, this curved honeycomb core takes advantage of the characteristic of being excellent in weight ratio strength, for example, the outer cylinder / housing of an aircraft engine, a part of the fuselage of an aircraft, the fuselage and head of a rocket, and also the hull and other parts. It can be used as various cylindrical shapes or curved structures.

Fourth, it can be manufactured easily and is excellent in cost. That is, this curved honeycomb core is
It is easy to manufacture simply by arranging each joining material on the base material sheet in a tapered vertical trapezoidal shape and then performing a conventional stretching method. That is, unlike the above-mentioned conventional flexible honeycomb core of this type, the manufacturing method does not require a special and complicated manufacturing method, and the manufacturing equipment does not need to be dedicated. It can be manufactured with excellent 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]

FIG. 1 provides a description of an embodiment of a curved honeycomb core and a method of manufacturing the same according to the present invention, (1)
The figure is a plan view of the base material sheet, (2) is a plan view in which a bonding material is provided, (3) is a perspective view in which the stacking and bonding are performed,
(4) The figure is a perspective view just before the expansion.

FIG. 2 is provided for describing an embodiment of the present invention, and FIG. 2A is a schematic perspective view of an expanded curved honeycomb core; FIG.
The figure is a perspective explanatory view of a main part, and the figure (3) is a plan explanatory view of a bonding material and a bonding part.

FIG. 3 is a schematic perspective view for explaining a method for manufacturing a honeycomb core of this type of conventional example, and FIG.
FIG. 2B shows a state in which the joining material is provided, FIG. 3C shows a cut state, FIG. 4D shows a state of stacking and joining, and FIG. 5A shows an expanded state.

FIG. 4 is a perspective view of a conventional honeycomb core of this type.

FIG. 5 provides a description of a honeycomb core of a conventional example of the same type;
(1) is a schematic perspective view before forming a curved surface, (2) is a plan view of one example of a main part, (3) is a plan view of another example of a main part, and (4) is a view of FIG. , A schematic perspective view after the curved surface is formed, and FIG. 5 (5) is a schematic perspective view after the curved surface is formed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Honeycomb core 2 Base material sheet (conventional example) 3 Joining material (conventional example) 4 Cell wall (conventional example) 5 Cell (conventional example) 6 Inner cell end surface (conventional example) 7 Outer cell end surface (conventional example) 8 Curved honeycomb core 9 Bonding material (of the present invention) 10 Base material sheet (of the present invention) 11 Bonding portion 12 Cell wall (of the present invention) 13 cells (of this invention) (Invention) 14 Inner cell end face (of the present invention) 15 Outer cell end face (of the present invention) A Stacking direction L Center width L ₁ One end width L ₂ Other end width R Curvature radius R ₁ Curvature radius R ₂ Radius of curvature T Strip length θ Angle

Claims (2)

[Claims] 1. A planar assembly of hollow columnar cells defined by cell walls, wherein a cell end face has a predetermined curvature and is formed into a curved surface inside and outside, and each joint between the cell walls is formed. ,
A curved honeycomb core characterized in that it has a vertically elongated trapezoidal shape with a tapered shape having a narrow width on an inner cell end surface side and a narrow width on an outer cell end surface side along a cell axis direction. 2. A method for manufacturing a curved honeycomb core, wherein a cell end face has a predetermined curvature and is formed into a curved surface inside and outside, wherein a bonding material such as an adhesive is tapered in such a manner that one end is wide and the other end is narrow. In the vertically elongated trapezoidal shape, a base material sheet arranged substantially linearly at a constant pitch is prepared. Next, a number of the base material sheets are displaced by a half pitch for each of the joining materials. In the relationship, together with stacking, heating and pressurizing and joining each other with each joining material, and then applying a tensile force in the stacking direction and expanding, thereby joining each joining portion by each joining material. The base material sheet bent along the edge and separated from portions other than the joints is defined as a cell wall, and is formed of a planar aggregate of hollow columnar cells defined by the cell wall. However, one end side of each joint portion by each of the joining materials between the cell walls is inside and the other end side is outside. , Having a predetermined curvature,
A method for manufacturing a curved honeycomb core, comprising obtaining a curved honeycomb core having a curved surface formed inside and outside.