JPH0441650B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is characterized in that the material used to form the honeycomb core is, for example, a non-metallic material that is strong and elastic and is difficult to obtain permanent bending deformation by only stretching. The present invention relates to a honeycomb core that can be easily formed even when using a raw material, and the formed honeycomb core is also suitable for forming various curved surfaces.

Conventional honeycomb cores are manufactured in such a way that each band-shaped material sheet is stacked alternately at positions shifted by half a pitch, through known processes such as applying an appropriate adhesive, stacking, and cutting, in order to facilitate manufacturing. By expanding the unexpanded honeycomb core 1 (see FIG. 1) in the stacking direction W as shown in FIG. B is extremely popular.

However, when the honeycomb core B is particularly formed of a non-metallic material that is strong and elastic and difficult to obtain permanent bending deformation by only stretching, the honeycomb core B is Since the core B restores itself over time due to the influence of outside air conditions such as humidity, the restoring force of the material, etc., it has been extremely difficult to mold the honeycomb core B with stable dimensions.
Therefore, conventionally, when forming a non-metallic honeycomb core, the honeycomb core B is expanded in heated steam such as saturated steam or expanded by a normal stretching method, and then the honeycomb core B is expanded using a chemical solution while the expanded state is maintained. It is necessary to form the honeycomb core B by a method suitable for each material, such as impregnating it and then drying it in a heating furnace or the like, or expanding it, heating it once, and then cooling it and forming it. It was hot. Therefore, the stretch molding operation is complicated, and since the stretch molding method differs depending on each material, manufacturing equipment suitable for each material must be installed, which is a disadvantage.

In addition, when forming the surface into a curved shape using the honeycomb core B, in addition to the rigidity of the core material,
Each cell wall C, C forming each cell A, A...
Because the bending angle of ... is other than 90°,
As shown in FIG. 4, when the honeycomb core B is curved along the curved surface die D, for example, in the stretching direction W, each cell A, A...
The interval between the cell walls C and C in the expansion direction W of ... is a curved surface type D
The distance between the cell walls C and C in the ribbon direction L increases. Further, the interval between the cell walls C, C of each cell A, A, . Therefore, the ribbon direction L of the honeycomb core B is curved upward in the opposite direction, resulting in a curved surface type D.
If the honeycomb core does not fit properly and tries to fit it by applying excessive force, the cell walls C may break or the adhesive portion may peel off, making it impossible to form a highly accurate curved honeycomb core that matches the curved shape D. Nakatsuta.

Therefore, when molding a curved honeycomb core, for example, as shown in FIG. By applying a certain amount of force, the shape of each cell is changed so that the bending angle of the cell wall is approximately 90°.
For example, when the cells are stretched out to have a substantially rectangular shape and curved in the ribbon direction L along the curved surface shape D, the interval between the cell walls in the stretched direction W of each cell is on either the concave curved surface or the convex curved surface. In addition, the spacing in the ribbon direction L contracts on the concave curved surface side and expands on the convex curved surface side, but this expansion and contraction of the spacing in the ribbon direction L causes the cell walls located perpendicular to the ribbon direction L to twist. Most of the resulting deformation is absorbed by the elastic deformation of the material, resulting in breakage of the cell walls,
There is no peeling of the adhesive part, and there is no bending in the stretching direction W.
A so-called overexpanded core E for forming a curved honeycomb core that has the characteristic of easily fitting into a curved shape D is known, but in order to form such a honeycomb core, selection of adhesive and expansion tension for overexpanding are required. Honeycomb core B is difficult to calculate, and the stretch forming process is complicated and difficult.
It has been pointed out that it is extremely difficult and troublesome to mold the overexpanded core E from the above.

The present invention was developed in view of the above-mentioned circumstances, and is formed so that each band-shaped material sheet is alternately stacked at positions shifted by half a pitch through appropriate processes such as applying adhesive, stacking, and cutting. The honeycomb core in an unexpanded state is expanded from one end by a force applied so as to be pulled along a direction substantially perpendicular to the same plane with respect to the stacking direction of the strip-shaped material sheet, and the expanded honeycomb core is expanded. By making the formed honeycomb core constituted by a collection of approximately quadrilateral cells, even in the case of the above non-metallic honeycomb core, a special stretch forming process is not required. It can be easily molded, and since each cell of the stretch-molded honeycomb core is approximately quadrilateral, it can be used for various curved surface molding without any special processes such as overexpansion. The purpose is to provide a honeycomb core suitable for

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

In FIGS. 1 and 2, 1 is a long material sheet (not shown) fed into a honeycomb core manufacturing apparatus (not shown), and is coated with a striped material at a predetermined pitch by a known suitable adhesive application means. An adhesive application step (not shown) in which adhesive is applied to the adhesive, and the long material sheet coated with adhesive is cut into predetermined lengths along the width direction of the long material sheet with reference to a predetermined position. A cutting process (not shown) and a piling process in which a predetermined number of material sheets cut to a predetermined length are adhered in a linear manner so that each material sheet is alternately glued in a line at a position shifted by half a pitch. (not shown) and an unexpanded honeycomb core formed through a cutting process (not shown) in which the stacked material sheets are cut into predetermined lengths in a direction perpendicular to the applied adhesive. In this unexpanded honeycomb core 1, the strip-like material sheets 2, 2... are alternately shifted by half a pitch, and the adhesive applied in a striped manner in the adhesive application process (not shown) is applied to the honeycomb core 1. They are bonded by adhesives 3, 3, and so on.

4 is a honeycomb core according to the present invention, and this honeycomb core 4 is arranged in order from one end of the unexpanded honeycomb core 1 in the same plane substantially perpendicular to the stacking direction of the strip material sheet 2. In other words, as shown in FIG. 2, the conventional honeycomb core Direction corresponding to ribbon direction L of B
A predetermined expansion tension P is applied to the cells 5, 5, .

Note that the shape of each cell 5, 5... constituting the honeycomb core 4 according to the present invention is not a safe rectangle in which the cell walls 6, 6... constituting each cell 5, 5... are orthogonal to each other. Alternatively, the shape may be somewhat parallelogram-like.

By the way, this honeycomb core 4 is stretch-formed by applying the stretching tension P in a predetermined direction as described above, but in this way, the rolling tension P pulls the unexpanded honeycomb core 1 in a prescribed direction of the strip material sheet 2. In order to ensure that the tensile force is transmitted as a pulling force along the direction of the force and the expansion is performed, it is necessary to pay attention to the following relationship. In other words, in the adhesive application process, the number
and the number Y of laminated strip-like material sheets 2 that are laminated, that is, laminated and bonded together in the layered layering process.
It is necessary to keep in mind the correlation between the

In other words, the number Y of the belt-shaped material sheets 2 that are piled up or laminated is set equal to, for example, the sum of the number Z of cells 5 stretched and formed in the illustrated direction L1 plus 3, and the number Z of the cells 5 is Since the number of coating strips X is equal to 3, the number of laminated sheets Y is equal to the number of coating stripes X plus 3.
(However, the direction shown is
(Regarding the case where the number Z of cells 5 in L1 is 2 or more).
For example, the number of strips of adhesive 3 applied to the strip-shaped material sheet 2 and the number Y of stacked strips of the strip-shaped material sheet 2 are set based on such a certain correlation, and the resultant unstretched state is When the expansion tension P is applied to the honeycomb core 1 as described above, the expansion tension P is transmitted as a tensile force that pulls the honeycomb core 1, so that the desired honeycomb core 4 whose cells 5 have a substantially rectangular shape or a substantially quadrilateral shape is formed. begins to be stretch-molded.

The honeycomb core 4 according to the present invention configured as described above includes an unexpanded honeycomb core 1 formed by a conventional known method, and a strip material sheet 2 constituting the unexpanded honeycomb core 1. It is formed by applying a predetermined expansion tension P along a substantially perpendicular direction on the same plane as the stacking direction (the so-called ribbon direction of the conventional honeycomb core B, that is, the L direction) and expanding it. Therefore, by stretching, the strip material sheets 2, 2... can be bent up to approximately 180° (conventionally 90°) along one side edge of the adhesives 3, 3... In the conventional honeycomb core B, even if the material is difficult to form a permanent bent portion at a predetermined angle for forming cell walls at a predetermined position in the strip material sheet 2 by only stretching, , band-shaped material sheet 2
Since the conventional maximum bending angle of about 90° can be bent further by 90°, each cell 5 can be easily bent by simply stretching it to a bending angle that takes into account the restoring force of the strip material sheet 2. , 5... can obtain a honeycomb core 4 having a substantially rectangular shape.

As described above, the honeycomb core 4 according to the present invention is
Since it consists of a planar assembly of substantially rectangular cells 5, 5..., this honeycomb core 4 is now expanded in the extending direction W of the conventional honeycomb core B in the honeycomb core 4.
When the direction W1 corresponding to the curved surface type D is curved along the curved surface type D, the direction L1 corresponding to the ribbon direction L of the conventional honeycomb core B is easily and reliably fitted to the curved surface type D without warping upward. Further, at this time, the cell walls 6 are not bent, the adhesive 3 is not peeled off, etc.

As is clear from the above description, since the present invention has the structure as described in the claims, the manufacturing thereof is also difficult, for example, because the material from which the honeycomb core is formed has strong stiffness and elasticity. , Even in the case of non-metallic materials, where it was difficult to easily form a bent part at a predetermined angle to form a cell wall by simply stretching, a special stretching process is required. It is possible to manufacture honeycomb cores from almost any material using the same manufacturing equipment by only partially modifying conventional manufacturing equipment. Since the honeycomb core is composed of a collection of approximately quadrilateral cells, it has excellent effects such as being suitable for forming various curved surfaces without going through processes such as overexpansion. There is something.

[Brief explanation of drawings]

Fig. 1 is an explanatory perspective view of an unexpanded honeycomb core formed by a conventional method, Fig. 2 is a plan view showing the structure of a honeycomb core according to the present invention, and Fig. 3 is a diagram showing the structure of a conventional honeycomb core. Plan view shown, No. 4
The figure is a perspective view illustrating curved surface processing using a conventional curved surface type honeycomb core. FIG. 5 is a plan view showing the manufacturing process of a conventional overexpanded core. In the figure, 1 is an unexpanded honeycomb core, 2 is a strip material sheet, 3 is an adhesive, 4 is a honeycomb core according to the present invention, 5 is a cell of the honeycomb core according to the present invention, 6 is a cell wall, and P is Expansion tension, A is the cell of the conventional honeycomb core, B is the conventional honeycomb core,
C is a conventional honeycomb core cell wall, D is a curved type,
E is the conventional overexpanded core, W is the stretching direction of the conventional honeycomb core, L is also the ribbon direction, W1 is the direction corresponding to the stretching direction of the conventional honeycomb core in the honeycomb core according to the present invention, L1
is also a direction corresponding to the ribbon direction.

Claims (1)

[Claims] 1. After going through processes such as applying appropriate adhesive, piling, and cutting, an unstretched honeycomb core formed in such a way that each band-shaped material sheet is stacked alternately at positions shifted by half a pitch is placed on one side. Starting from the end,
The honeycomb core is formed by being expanded by a force applied in a direction substantially perpendicular to the same plane with respect to the stacking direction of the band-shaped material sheets, and the honeycomb core is formed by an aggregate of cells having a substantially quadrilateral shape. Honeycomb core is characterized by