JP2586933B2 - Honeycomb core - Google Patents

Description

The present invention relates to a honeycomb core.

More specifically, one direction in the honeycomb core,
For example, the present invention relates to a honeycomb core in which a so-called stretching direction and a shear strength in a direction orthogonal to the stretching direction are substantially equal.

"Prior art" and "Problems to be solved by the invention" Since the honeycomb core has a large weight-to-strength ratio and is easy to mold, generally, as shown in FIG. A honeycomb core A composed of a planar assembly of formed cells B having a substantially regular hexagonal hollow column shape is frequently used.

However, in the honeycomb core A, a so-called stretching direction W of the honeycomb core A and a direction orthogonal to the stretching direction, a so-called ribbon direction L, extend along the stretching direction W within a unit area, for example, X The number of cell walls C existing in the cut plane when cut along the X-ray, and the cell walls existing along the ribbon direction L, for example, the cut plane when cut along the YY line With the number of C, the number of cell walls existing in the cutting plane along the extension direction W is about 1.5 times larger, so this is the main cause, and the shear strength in the ribbon direction L is larger than the shear strength in the extension direction W, It becomes remarkably large.

Therefore, for example, in a sandwich panel using the honeycomb core A as a core material, since the shear strength is significantly different between the longitudinal direction and the width direction, such a sandwich panel may be used as a structural material depending on a device. There were times when I could not do it.

Further, even when such a sandwich panel can be used as a structural material, for example, depending on how the load is applied, a large distortion or the like is likely to occur in a direction where the shear strength is small. Since the extending direction W and the ribbon direction L of the honeycomb core A constituting the core material are limited, the forming of the sandwich panel is not easy, and the yield of the honeycomb core A is low, so that the sandwich panel becomes expensive. There were drawbacks.

Therefore, as shown in FIG. 7, the honeycomb core A is further removed by a predetermined amount in the stretching direction W as a honeycomb core having the same shear strength in the stretching direction W and the ribbon direction L as the honeycomb core A in which the disadvantages of the honeycomb core A are eliminated. cell walls F to form each cell E, which is formed by stretched honeycomb core bending angle F ₁ is formed of planar aggregate of rectangular cells E in a substantially 90 °, so-called over-expanding core D is Are known.

In the this over expanding core D, at a predetermined position in the unit area, the number of cell walls F ₁ present in the cut surface when cut along a stretched direction W, taken along the ribbon direction L Since the number of cell walls F existing in the cutting plane at this time is substantially equal, the shear strength in the stretching direction W and the ribbon direction L is substantially equal, but the overexpanded core D
Expands the honeycomb core A in the expansion direction W,
That is, for example, the planar shape of each cell E is increased by applying an extension tension to such an extent that the cell walls F ₁ , F ₁ adhered to each other via an adhesive layer (not shown) formed in a stripe shape are not separated. , since it is formed by the cell walls F, respectively, the bent angle of the F ₁ are as much as possible to stretched rectangular shape having a substantially 90 °, in molding the over-expanding core D, the selection of adhesive, over-stretched The calculation of the extension tension for, and the means for uniformly over-extension are troublesome, and especially,
It has been pointed out that it is extremely difficult to form an over-expanded core D in which the shape of each cell E is uniform.

Therefore, in order to solve the difficulties of the over-expanded core D, in part, each band-shaped base sheet constituting the cell wall, at every predetermined interval in the longitudinal direction of the base sheet, Along the width direction and 1/2 of the length in the width direction
Formed by forming slit-shaped grooves having a length of, and assembling the grooves and grooves of the respective base sheets in such a manner that the respective base sheets are orthogonal to each other, and fixing these assembled portions by bonding or the like. Honeycomb core consisting of a planar aggregate of cells having a substantially square planar shape, or a honeycomb core formed by, for example, bonding a hollow prismatic base material having a substantially square cross section to each other, and bonding the sides to each other. Provided. However, in these honeycomb cores, for example, the shear strengths of the honeycomb cores corresponding to the extending direction W and the ribbon direction L of the over-expanded core D are equal in both the left-right direction and the front-rear direction, and the shape of each cell is Although it is possible to form a uniform honeycomb core, it is difficult to form any of the honeycomb cores having a small cell size, and in particular, in the former case, it is extremely troublesome to fix the respective assembled parts by bonding or the like.
In addition, in the latter case, it is difficult to form a high-precision thin-walled hollow prismatic base material having a substantially square cross section, and the joining portion by adhesion or the like is a general honeycomb. Compared to the core, it is extremely large, so the joining work is troublesome and the formed honeycomb core has a high density,
The problem of heavy weight was pointed out.

The present invention has been made in view of the above circumstances, and the object thereof is that the so-called stretching direction of a normal honeycomb core and the direction orthogonal to the stretching direction, the shear strength in the direction corresponding to the so-called ribbon direction, respectively. It is possible to form a honeycomb core having substantially the same size, a small cell size, and a uniform shape of each cell, and the forming is made up of a conventional, for example, a planar aggregate of substantially regular hexagonal cells. An object of the present invention is to provide a honeycomb core such as a honeycomb core that can be formed by substantially the same forming means as a normal honeycomb core.

"Means for Solving the Problems" The present invention has been made to achieve the above object, and the technical solutions thereof are as follows.

This honeycomb core is formed of a planar aggregate of hollow columnar cells having a predetermined planar shape formed by cell walls formed of a base material, and the cell walls forming the cells have a predetermined length. A short side having a predetermined length and a long side having a length twice as long as the short side are bent at a predetermined angle to each other, and exhibit a shape that is alternately and continuously located. A large number of base materials provided with a plurality of the bases at substantially the center in the longitudinal direction of the base material at each of the long sides of the adjacent one of the base materials, and the short sides of the other base material in the one base material. In order to be positioned in parallel with each short side, the long sides of both base materials abut against each other in a positional relationship shifted by 1/2,
In addition, the corresponding contact portions on each long side portion are joined, and the length of the long side portion of the substrate is 1/2 of the length of the long side portion, that is, linearly with an interval equal to the length of the short side portion. In a continuous state, one cell wall composed of a single substrate constituted by short sides positioned parallel to each other intersects at an angle equal to a predetermined bending angle of the one cell wall and the substrate. Is located
The other consisting of two bases formed by the corresponding contact portions of the long sides joined together in a state where they are linearly connected with an interval equal to the length of the short sides, Cell walls are formed, and are located in an intersecting manner at these predetermined angles, and a pair of the one cell walls having a length equal to the length of the short side portion, and a pair of the other cell walls. Each cell formed in a substantially parallelogram in a plane is arranged in series.

[Operation] The present invention comprises the above means, and operates as follows. That is, the honeycomb core according to the present invention has a configuration in which the lengths of the respective sides are equal, that is, the cells formed in a substantially parallelogram plane by cell walls having the same length are arranged in series. Therefore, the diagonal lines are orthogonal to one diagonal line of the cells, and the diagonal lines of each of these cells are both linearly connected. In addition, a cell wall forming a cell has a pair of one cell walls facing each other along one direction, each of which is formed of one base material, and a pair of cell walls facing each other along the other direction. The other cell wall is formed by two base materials, respectively, has a predetermined shape forming these cell walls, and base materials having a predetermined length are arranged in a predetermined positional relationship. Therefore, at a predetermined position within a unit area of the honeycomb core, a so-called stretching direction of a normal honeycomb core, a direction orthogonal to the stretching direction, a direction corresponding to the so-called ribbon direction, i.e., one diagonal of the cell. The number of cell walls (number of base materials) existing in the cut plane when cut along the direction along the direction of the cell wall existing in the cut plane when cut along the direction along the other diagonal line Because substantially equal and the (number of substrates), the direction along one diagonal line of each cell in the honeycomb core, the shear strength in the direction along the other diagonal line is substantially equal.

Further, in forming the honeycomb core according to the present invention, for example, in the case of using a so-called stretch forming means that is easy to form, in the step of forming a bonding material layer with an adhesive or the like on a sheet-like base material, A predetermined width of the striped bonding material layer, that is, a bonding material layer set to have a width equal to the length of one side of the cell of the honeycomb core to be formed, a length three times the predetermined width of the bonding material layer. For example, a predetermined number of base materials on which the bonding material layers are formed are formed, for example, on one side of each bonding material layer of the base material located on the lower side and the base material stacked on the base material. A non-expanded honeycomb core is formed by successively overlapping and layering in a positional relationship where the other side of each joining material layer of the material coincides, and this unexpanded honeycomb core is slightly inclined and straightened. Are joined via the joining material layer It is possible to form the honeycomb core by stretched in a direction along the respective joint formed by the two sheets of substrates.

Therefore, the width and pitch of the bonding material layer to be formed are set to be 1: 3, and in the laminating step, the positional relationship between the bonding material layers of the base materials to be stacked is overlapped so that the above positional relationship is obtained. By attaching, the subsequent forming means is substantially the same as in the case of the conventional honeycomb core.

In the case of forming by a so-called corrugating means, the corrugated base material prepared in advance is provided with a predetermined length, that is, a length equal to the length of one side of the cell of the honeycomb core to be formed. The short side set to the above and the long side set to twice the length of the short side are bent at a predetermined angle to each other, and are alternately and continuously located. Formed in a wavy shape, these predetermined number of substrates, sequentially, at the approximate center of the longitudinal direction of the substrate on each long side of one substrate, to locate each short side of the other substrate, The long sides of both base materials can be formed by arranging them in a positional relationship in which they are in contact with each other with a shift of 1/2, and by joining the long sides in contact with each other.

Therefore, although the shape of the base material formed in a corrugated shape and the positional relationship in which the base materials are arranged are slightly different, the base material can be formed by substantially the same forming means as a conventional honeycomb core.

Therefore, no matter which molding means,
It is possible to form a honeycomb core with a small cell size,
In addition, it is possible to mold a honeycomb core with a uniform cell shape,
Moreover, the molding is easy.

"Example" Hereinafter, the present invention will be described based on an example shown in the drawings.

FIG. 1 is a plan view of a main part showing an embodiment of a honeycomb core according to the present invention, and FIG. 2 is an explanatory diagram showing an arrangement state of base materials constituting a cell wall.

In the drawing, reference numeral 1 denotes a honeycomb core, and the honeycomb core 1 is formed of a planar aggregate of hollow columnar cells 3 having a plane square shape formed by cell walls 2, 2a.

The cell walls 2, 2a forming the cell 3 are as follows.

That is, each cell wall 2, 2 a has a short side 5 having a length equal to the length of one side of the cell 3 and a long side 6 having a length twice as long as the length of the short side 5. A predetermined number of base materials 4 each having a predetermined length that is bent at 90 ° to each other and has a shape in which the short side portions 5 and the long side portions 6 are alternately and continuously located, Each long side portion 6 of one adjacent base material 4
In the center of the base material 4 in the longitudinal direction, each short side part 5 of the other base material 4 is perpendicular to each long side part 6 of the one base material 4, that is, each short side of the one base material 4 In order to be positioned in parallel with the portion 5, the long sides 6 of the adjacent base materials 4 abut against each other in a positional relationship shifted by そ の in the longitudinal direction, and the long sides 6 correspond to each other. The contact portion is bonded via an adhesive layer 7 formed by, for example, an applied adhesive, and the respective substrates 4 are assembled.

However, the length of the long side portion 6 of the base material 4 is 1/2 of the length of the long side 6 of the base material 4
One cell wall 2 made of a single base material 4 composed of short sides 5 located in parallel with each other in a state of being linearly connected at intervals equal to the length of the short side 5; One of these cell walls 2 is positioned in an intersecting manner at an angle of 90 °, and is arranged in a straight line with an interval equal to the length of the short side portion 5 of the base material 4, and is positioned parallel to each other. The other cell wall 2a composed of the two substrates 4 constituted by the long sides 6 bonded to each other via the adhesive layer 7 is formed, and these are located in a state of intersecting at right angles to each other, A pair of one cell walls 2 both having a length equal to the length of the short side portion 5 of the base material 4
And the cell 3 formed by the pair of the other cell walls 2a
Are formed in a planar square, and the cells 3 are arranged in series.

 The honeycomb core 1 is configured as described above.

Therefore, in the honeycomb core 1 according to the above-described embodiment, the cells 3 formed in a planar square have a configuration in which the cells 3 are arranged in series.
One diagonal line (not shown) and the other diagonal line (not shown) are orthogonal to each other, and one diagonal line and the other diagonal line of each of the cells 3 are linearly connected together. positioned. Further, a cell wall forming the cell 3
2, 2a, the pair of one cell walls 2 are each formed of one base material 4, and the other cell wall 2a is formed of two base materials 4, respectively. As shown in FIG. 3, in a unit area (solid line portion in the figure) of the honeycomb core 1, a so-called stretching direction of a normal honeycomb core and a direction orthogonal to the stretching direction, a direction corresponding to a so-called ribbon direction, respectively, The number of cell walls 2, 2a existing in a predetermined position along a diagonal line (vertical diagonal line in the figure) of each cell 3, for example, a cut plane when cut along the II line That is, when cutting along the number of base materials 4 constituting the cell walls 2 and 2a and a predetermined position along the other diagonal line (the left-right diagonal line in the figure), for example, along the II-II line Cell walls 2, 2a existing within the cut surface of Number, i.e., cell wall 2, 2a
Since the number of base materials 4 constituting the same is the same as the number of the nine substrates, the shear strength in the direction along one diagonal of each cell 3 in the honeycomb core 1 is the same as the shear strength in the direction along the other diagonal.

 Next, a method for forming the honeycomb core 1 will be described.

First, a method for molding by so-called stretch molding means will be described with reference to FIGS.

In the case of the stretch forming means, as shown in FIG. 4, first, the cells of the honeycomb core 1 to be formed on one surface of the sheet-like base material 4 along the longitudinal direction or the width direction thereof. 3 side length (cell wall 2, 2a forming cell 3)
Length), a strip-shaped adhesive layer 7 set to a width Wa equal to
Is formed at every pitch P equal to three times the width Wa of the adhesive layer 7, for example, by applying an adhesive.

Next, as shown in FIG. 5, for example, one side 7a of each adhesive layer 7 of the base material 4 located on the lower side and The unstretched state is obtained by superimposing a predetermined number of superimposed substrates 4 in a positional relationship where the other side 7b of each adhesive layer 7 of the substrate 4 superimposed on the substrate 4 coincides. After forming the honeycomb core 11 and cutting the unexpanded honeycomb core 11 at predetermined lengths along a direction orthogonal to the adhesive layer 7, the honeycomb core 11 is slightly inclined,
By extending a predetermined amount in a direction along each of the bonding portions (corresponding to the cell walls 2a of the honeycomb core 1) formed by the two base materials bonded through the adhesive layer 7 positioned in a straight line. The base material 4 (corresponding to the cell wall 2) which is present as a single sheet and located between the bonded portions is bent 90 ° along the side edges of both bonded portions, and the honeycomb core 1 shown in FIG. Is obtained.

Therefore, the width of the adhesive layer 7 to be formed and the pitch P thereof are set to be 1: 3, and in the lamination process,
Since the positional relationship of the adhesive layers 7 of the respective base materials 4 to be overlapped is overlapped and superposed so that the above positional relationship is obtained, the subsequent forming means is substantially the same as that of the conventional honeycomb core.

Next, a method for forming by a so-called corrugating means will be described with reference to FIGS.

In the case of the corrugating means, first, a strip-shaped base sheet having a predetermined length is set to a length equal to the length of one side of the cell 3 of the honeycomb core 1 to be formed by an appropriate processing means. The short side portion 5 and the long side portion 6 set to be twice as long as the short side portion 5 are bent 90 ° from each other and formed in a wave shape that is alternately and continuously located. Then, a predetermined number of these base materials 4 formed in a corrugated shape,
In order for each short side 5 of the other base 4 to be positioned at the center of the long side 6 of the base 4 in the longitudinal direction of the base 4, each long side 6 of both bases 4 is sequentially positioned. Are arranged in a positional relationship in which they correspond to each other with a shift of 1/2, and the corresponding long sides 6 are bonded, for example, via an adhesive layer 7 formed on one of the base materials 4. By doing so, the honeycomb core 1 shown in FIG. 1 can be formed.

Therefore, although the shape of the base material 4 formed in a corrugated shape and the positional relationship of arranging the base materials 4 are slightly different, the base material 4 can be formed by substantially the same forming means as the honeycomb core formed by the conventional so-called corrugate forming means. it can.

Therefore, no matter which molding means,
The honeycomb core 1 having a small size of the cell 3 can be formed, and the honeycomb core 1 having a uniform shape of the cell 3 can be formed, and the molding is easy.

Note that, in the above-described embodiment, the honeycomb core 1 in which the shape of the cell 3 is a plane square is described. However, the shape of the cell 3 is not limited to a square, and may be a rhombic quadrilateral. In the case of a quadrilateral approximating a square, the shear strength in the direction along each diagonal of the cell 3 is substantially the same as in the case where the shape of the cell 3 is a square.

[Effects of the Invention] As described in detail above, according to the honeycomb core of the present invention, each cell formed by a cell wall in a plane substantially parallelogram having the same length on each side is connected in series. In addition, the cell walls forming the cells are configured such that one pair of cell walls is formed of one base material, and the other pair of cell walls is formed of two base materials. With a predetermined shape constituting these cell walls, the base material having a predetermined length is configured to be arranged in a predetermined positional relationship, so that the so-called stretching direction of a normal honeycomb core,
It is possible to form a honeycomb core in which the shear strength in the direction orthogonal to the stretching direction, the direction along each diagonal of the cells corresponding to the so-called ribbon direction, is substantially equal, the cell size is small, and the shape of each cell is uniform. The problems that the conventional honeycomb core has, such as being easily possible, have been eliminated, and the effect of the present invention is remarkably large.

[Brief description of the drawings]

FIG. 1 is a plan view of an essential part showing an embodiment of a honeycomb core according to the present invention, FIG. 2 is an explanatory view showing an arrangement state of base materials constituting a cell wall, and FIG. 3 is along a diagonal line of the cell. FIGS. 4 and 5 each show an example of a forming process of a honeycomb core, and FIG. 4 shows a state in which an adhesive layer is formed on a base material. FIG. 5 is a front view of a main part, and FIG. 5 is an explanatory view showing a step of forming a honeycomb core in an unexpanded state by stacking and laminating a predetermined number of base materials. FIGS. 6 and 7 each show a conventional example, and FIG. 6 compares the shear strength in the extending direction of the honeycomb core composed of a planar aggregate of substantially regular hexagonal cells and the shear strength in the direction along the ribbon direction. FIG. 7 is a plan view of a main part of the overexpanded core. DESCRIPTION OF SYMBOLS 1 ... Honeycomb core 2, 2a ... Cell wall 3 ... Cell 4 ... Substrate 5 ... Short side part 6 ... Long side part 7 ... Adhesive layer 11 ... Honeycomb core in unexpanded state P ... … Adhesive layer pitch Wa …… Adhesive layer width

Claims (1)

(57) [Claims] 1. A honeycomb core comprising a planar aggregate of hollow columnar cells having a predetermined planar shape formed by cell walls formed of a base material, wherein each cell forming the cells of the honeycomb core is provided. The wall has a short side having a predetermined length and a long side having a length twice as long as the short side bent at a predetermined angle to each other, and are located alternately and continuously. A large number of base materials having a predetermined length exhibiting a shape are provided at approximately the center in the longitudinal direction of the base material at each long side portion of one adjacent base material, and each short side portion of the other base material is provided. In order to lie parallel to the short sides of the one base, the long sides of the two bases abut against each other in a positional relationship shifted by 1/2, and The contact portion is joined, and the length of the length of the long side portion of the base material is 1/2, that is,
In a state of being linearly continuous with an interval equal to the length of the short side portion, one cell wall made of a single base material constituted by short side portions positioned parallel to each other, and the one cell wall and The base materials are joined in a state of being intersected at an angle equal to a predetermined bending angle, and in a state of being linearly continuous with an interval equal to the length of the short side portion, and being located parallel to each other. The other cell wall made of the two base materials constituted by the corresponding contact portions of the long side portion is formed, and is located in an intersection at the predetermined angle, and both have the same length as the length of the short side portion. A honeycomb core, wherein cells formed in a substantially parallelogram plane by a pair of the one cell walls having a height and a pair of the other cell walls are arranged in series.