JPH067866A - Honeycomb panel - Google Patents

Abstract

PURPOSE:To provide a honeycomb panel which is excellent in productivity and is not only easy for various bending from a large to a small radius of curvature but also not deteriorating rigidity and strength. CONSTITUTION:The honeycomb panel 1 is a curved surface honeycomb panel made of aluminum alloy, gently curved in one direction, a joined by brazing, on both sides of the honeycomb core 2 (in the hight direction), with panels 3, 4 having curved surfaces. This honeycomb core 2 is an assembly with plural core materials 2a arrayed in the direction of an arrow D, and a corrugated part 7 with three corrugations is provided in the abutting part 5 of each core material 2a. Also, a part of the corrugated part 7, which is formed in the abutting part 5 oppositely facing, is in a state mutually fitted and engaged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightweight and high-strength honeycomb panel.

[0002]

2. Description of the Related Art Conventionally, a honeycomb panel joined by brazing has been widely used as a structural material that is lightweight and has high strength. In particular, in recent years, a honeycomb panel having a curved surface (curved honeycomb panel) has been manufactured as a structural material corresponding to a device having a complicated shape. This type of curved honeycomb panel has been conventionally manufactured by the following methods.

A flat panel is bent. As shown in FIGS. 8 (a) and 8 (b), honeycomb cores P1 and P2 having a special shape and structure capable of forming a curved surface.
To use. As shown in FIG. 9, the bending direction (arrow A direction) and the vertical direction (arrow B direction) are set so that the honeycomb panel can be easily bent.
The honeycomb core P3 is lined up.

[0004]

However, such conventional methods have various problems. For example, in the general plate bending method described at the beginning, the productivity is not a problem because it is simple, but since the honeycomb core has the property of resisting bending, it is limited only when the radius of curvature is large and small. There is a problem that a curved surface having a radius of curvature cannot be formed. In addition, there is a problem that the processing is difficult when the curvature changes in the same plane.

Further, in the method of FIG. 8A, it is necessary to bond a predetermined honeycomb core P1 in advance, and the manufacturing cost of the honeycomb core P1 at that time is high, and the applicability to the case where the cell size is large is also applicable. There was a problem of lacking. Further, in the method shown in FIG. 8B, the honeycomb core P
2 had to be processed into a unique shape, and the workability of the assembly before brazing was poor.

The method shown in FIG. 9 can be said to be the easiest method for obtaining a curved honeycomb panel by brazing, but as shown by the diagonal lines in the figure, the honeycomb core P3 is provided on the convex side of the panel.
Gap (where the cores are not joined) occurs.
That is, a region (non-supporting region P4) where the honeycomb core P3, which is the support, does not exist is generated in the longitudinal direction, so that there is a problem that the structure is weak particularly against repeated bending load in the direction of arrow C.

The present invention has been made in order to solve the above problems, is excellent in productivity, and can easily perform various bendings from a large radius of curvature to a small radius of curvature.
It is an object of the present invention to provide a honeycomb panel that is free from rigidity and strength reduction.

[0008]

In order to achieve the above object, the invention of claim 1 is a honeycomb panel in which plate members are joined to both end faces in the height direction of a honeycomb core, and the honeycomb cores are opposed to each other. A gist of a honeycomb panel is characterized in that a wavy portion extending in the height direction of the honeycomb core is provided in the abutting portion.

A second aspect of the invention provides the honeycomb panel according to the first aspect, wherein the corrugated portion is provided over the entire circumference of the honeycomb core. A third aspect of the invention provides the honeycomb panel according to the first or second aspect, wherein the honeycomb panel is a curved honeycomb panel in which the plate material is bent.

Here, as the shape of the corrugated portion, a corrugated shape having a smooth curve is preferable, but other than that, for example, as in the case of a rectangular wave, unevenness having a rectangular or polygonal cross section is continuous. It may have a shape. Further, the number of the irregularities of the wavy portion may be plural, but at least one is required as long as it has a shape that divides the non-support region.

Further, when the corrugated portion extends in the height direction of the honeycomb core and reaches both end faces thereof, it is preferable in terms of strength, but in addition to that, the corrugated portion does not reach both end faces of the honeycomb core, or The shape may be partially cut out and not continuous in the height direction. A brazing sheet having a brazing material formed on the surface thereof can be used as the honeycomb core and the plate material, and the plate material and the honeycomb core made of the brazing sheet are integrally bonded to each other to manufacture a honeycomb panel.

In particular, in the case of manufacturing a honeycomb panel having a curved surface, a method in which a honeycomb core having a wavy portion is sandwiched between flat plate members, bent, and then brazed by heating, While sandwiching a honeycomb core with a flat plate material, heating and brazing, then performing a bending process, the honeycomb core with a wavy portion is sandwiched between plate materials having a curved surface, and heated as it is. A brazing method or the like can be adopted.

[0013]

The invention of claim 1 is characterized in that the abutting portion of the honeycomb panel is provided with a wavy portion extending in the height direction of the honeycomb core. By providing this corrugated portion, for example, in a flat honeycomb panel, the core strength is improved, so that the core can be made thinner and the cell size can be increased.

In particular, for example, in a curved honeycomb panel, it is important that the corrugated portion is arranged so as to divide the non-supported region of the honeycomb core, and the corrugated portion covers a part or the whole of the non-supported region. By being arranged so as to be divided, the curved honeycomb panel is reinforced against the bending of the curved honeycomb panel in the direction of arrow C (see FIG. 9) and becomes stronger, and a curved honeycomb panel having excellent rigidity and strength is obtained.

[0015]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 to 3 show a honeycomb panel of the first embodiment. Here, FIG. 1 is a perspective view showing a partially broken honeycomb panel, FIG. 2 is a side view seen from the direction of arrow D in FIG. 1, and FIG. 3A is a plan view showing a honeycomb core. Yes, FIG. 3B is a perspective view showing the honeycomb core.

As shown in FIGS. 1 to 3, the honeycomb panel 1 of this embodiment is a curved honeycomb panel made of an aluminum alloy that gently curves in a fixed direction and has a thickness of 0.1.
On both sides (in the height direction) of the honeycomb core 2 of about several mm,
Face plates 3 and 4 having a curved surface and having a thickness of about 0.4 to several mm are joined by brazing.

This honeycomb core 2 has a plurality of core materials 2.
a is arranged in the direction of arrow D and combined, and the abutting portion 5 of each core material 2a is provided with a corrugated portion 7 having three waves. Then, a part of the wavy portions 7 formed on the facing butting portions 5 are in a state of being fitted and engaged with each other. That is, as shown in FIG. 2, the corrugated portions 7 are deeply fitted to each other at the lower portion thereof, but at the upper portion thereof, they are slightly opened (opening α) according to the curved surface, and the unsupported area is formed. Is divided.

FIG. 3 shows a combination state of the core material 2a before the honeycomb panel 1 is bent. The minimum value Wmin of the wave width of the corrugated portion 7 of the core material 2a is as follows (1). It is obtained by the formula. It should be noted that the maximum value may be within a range where the assembly workability is not extremely deteriorated.

Wmin = Ch (Ct + Cs / 2) / {2 · (R + Ft)} (1) Ch: core height, Ct: core thickness, Cs: cell size (distance between opposite sides) R: concave side surface Curvature radius, Ft: Thickness of the surface material on the concave side,
[All are in mm] Next, a method for manufacturing the honeycomb panel 1 of the first embodiment will be described with reference to FIG.

First, the face plates 3 and 4 are formed by quadric surface rolls each having a predetermined radius of curvature. However, the face plate 3,
Depending on conditions such as the case where the plate thickness of 4 itself is thin and the radius of curvature is relatively large, the face plates 3 and 4 themselves bend, so it is not necessary to perform pre-molding, but it is better to pre-mold for accuracy and precision. It is desirable in terms of workability. On the other hand, the core material 2a is obtained by cutting a thin plate in which a brazing material is clad by rolling and then bending (or pressing) it into a trapezoidal shape that forms a honeycomb having the corrugated portion 7.

Next, as shown in FIG. 4, a flat plate 11 of a friction reducing material is placed on the lower mold 10 and a face plate 4 on the convex side is placed.
Next, on the face plate 4, the trapezoidal tops of the core materials 2a are back-to-back, and the corrugated portions 7 are fitted together for positioning. As a result, the core materials 2a are arranged so as to form the predetermined angle α. In this state, the face plate 3 is placed on each core material 2a, and then the upper die 19 is placed on the face plate 3 via the flat plate 12 of the friction reducing material. In this state, the surroundings are evacuated while heating, and the upper mold 19 applies pressure.

By this heating, the brazing material clad on the surfaces of the face plates 3 and 4 and the core material 2a melts into the gaps between the members, so that the face plates 3 and 4 and the core material are cooled by cooling in this state. 2a and core material 2a
The honeycomb panels 1 having a curved surface are completed by joining the members to each other.

According to this construction, the face plates 3 and 4 and the core material 2a are sequentially combined to form the lower die 10 and the upper die 19 respectively.
The radius of curvature of the panel itself can be arbitrarily determined only by arbitrarily selecting the radius of curvature of. Further, since the corrugated portions 7 provided on the butting portion 5 are fitted to each other to divide the non-support region, a curved panel having less rigidity and strength reduction than a flat panel can be obtained without difficulty. Furthermore,
Since the strength of the core material 2a is improved by providing the corrugated portion 7, it is possible to reduce the weight of the entire panel,
Moreover, since the corrugated portions 7 are inserted into each other, the positioning of the core material 2a is easy, which has an advantage that the workability of assembling is improved.

In the first embodiment, the brazing process is performed after the bending process. Alternatively, the brazing process may be performed after the brazing process. Since the honeycomb core 2 extends in the height direction of the honeycomb core 2, the bending is not hindered and the processing is easy.

Next, a second embodiment will be described with reference to FIG. The second embodiment has the same structure as that of the first embodiment except the honeycomb core, and therefore the description thereof is omitted.
In FIG. 5, the state of the honeycomb core before bending is shown.

As shown in FIG. 5, the honeycomb core 20 used in the honeycomb panel of this embodiment has a core element 20.
A wavy portion 21 is formed on the entire circumference of a. Therefore, in this embodiment, the same effect as that of the first embodiment is obtained, and since the corrugated portion 21 is formed on the entire circumference of the core element 20a, when performing the bending process after brazing, The honeycomb core 20 is less likely to be deformed, so that the bending curvature can be increased (that is, the curvature radius can be decreased).

Next, a third embodiment will be described with reference to FIG. The third embodiment has the same structure as that of the first embodiment except the honeycomb core, and therefore the description thereof is omitted.
In FIG. 6, the state of the honeycomb core before bending is shown.

As shown in FIG. 6, the honeycomb core 30 used in the honeycomb panel of this embodiment has a core element 30.
A wavy portion 32 formed of one wave is formed on the abutting portion 31 of a. Therefore, in this embodiment, the first
The effect similar to that of the embodiment is obtained, and since the number of waves in the wavy portion 32 is one, there is a feature that the structure of the wavy portion 32 is simple.

Next, a fourth embodiment will be described with reference to FIG. As shown in FIG. 7, the honeycomb panel 40 of this embodiment is not a curved surface-shaped panel but a flat plate-shaped panel unlike the above-described respective embodiments. Then, the abutting portion 42 of the honeycomb core 41 used in the honeycomb panel 40 has two
A wavy portion 43 having individual waves is formed.

Therefore, in this embodiment, the strength of the honeycomb core 41 is higher than that of the conventional flat panel.
There is an advantage that the honeycomb core 41 can be made thin, and thereby the cell size can be increased. Although the embodiment of the present invention has been described above, the present invention is not limited to this, and it is needless to say that various modes can be adopted without departing from the scope of the invention.

[0031]

As described above, according to the honeycomb panel of the present invention, since the core strength is improved, the core can be made thinner, the weight can be reduced, and the cell size can be increased. .

Particularly, in the case of a curved honeycomb panel, there is a feature that a curved panel having less rigidity and strength lower than that of a flat honeycomb panel can be easily obtained. Further, since the strength of the honeycomb core is increased and the corrugated portion does not hinder the bending process, there is an advantage that the bending process after brazing is easy. Further, since the corrugated portions are engaged with each other, the positioning is facilitated, and as a result, the assembling work is improved and the productivity is improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a honeycomb panel according to a first embodiment of the present invention.

FIG. 2 is a side view showing the honeycomb panel of the first embodiment.

FIG. 3 is an explanatory view showing a honeycomb core of the first embodiment.

FIG. 4 is an explanatory view showing the method for manufacturing the honeycomb panel of the first embodiment.

FIG. 5 is a plan view showing a honeycomb core of a second embodiment.

FIG. 6 is a plan view showing a honeycomb core of a third embodiment.

[Fig. 7] Fig. 7 is a perspective view showing a partial judgment of a honeycomb panel of a fourth embodiment.

FIG. 8 is an explanatory diagram showing a conventional example.

FIG. 9 is an explanatory diagram showing another conventional example.

[Explanation of symbols]

 1, 40 ... Honeycomb panel 2, 20, 30, 41 ... Honeycomb core 3, 4 ... Face plate 5, 31, 42 ... Butt portion 7, 21, 32, 43 ... Wavy portion

Claims (3)

[Claims] 1. A honeycomb panel in which plate materials are joined to both end surfaces of a honeycomb core in the height direction, wherein wavy portions extending in the height direction of the honeycomb core are provided at abutting portions where the honeycomb cores face each other. Honeycomb panel characterized by that. 2. The honeycomb panel according to claim 1, wherein the corrugated portion is provided over the entire circumference of the honeycomb core. 3. The honeycomb panel according to claim 1 or 2, wherein the honeycomb panel is a curved honeycomb panel in which the plate material is bent.