JPH067867A - Curved honeycomb panel - Google Patents

Abstract

PURPOSE:To provide a honeycomb panel which is excellent in productivity, simple in various bending and capable of preventing reduction in rigidity and strength by providing a protruding part, which is joined with the plate material on the convexed side of curved surface, at least in one of the abutting parts facing each other between honeycomb cores. CONSTITUTION:The honeycomb panel 1 is a curved surface honeycomb panel made of aluminum alloy, gently curved in one direction, and 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 the protruding part 7 are provided oppositely in the abutting part 5 of each core material 2a.

Description

Detailed Description of the Invention

[0001]

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

[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. 7 (a) and 7 (b), honeycomb cores P1 and P2 having a special shape and structure such that a curved surface can be formed.
To use. As shown in FIG. 8, 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. 7 (a), 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. 7B, 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. 8 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 curved honeycomb panel in which plate members are joined to both end faces in the height direction of the honeycomb core, and A curved honeycomb panel is characterized in that at least one of the opposing butting portions is provided with a projecting portion that projects toward the butting portion and is joined to the plate material on the convex side of the curved surface.

According to a second aspect of the present invention, in a curved honeycomb panel in which plate members are joined to both end faces in the height direction of the honeycomb core, at least one of the abutting portions of the honeycomb cores facing each other has the abutting portion direction. A gist of a curved honeycomb panel is characterized in that an overhanging portion is provided so as to project to the above and join and fix the abutting portions to each other.

Here, as the shape of the protruding portion and the protruding portion, those having a wavy, rectangular or polygonal cross section can be adopted. Further, the protruding portion and the projecting portion may be provided only on one butting portion, or may be provided at both butting portions facing each other. Further, the number of the protruding portions and the protruding portions may be plural, but at least one is required as long as it has a shape that divides the non-support region.

Further, the protrusion is provided not only on the convex side (of the curved surface) of the abutting part but also on the concave side, and further, a dent into which the concave side protruding part is fitted is provided in the facing abutting part. This is preferable because the honeycomb core can be easily aligned during assembly. A brazing sheet having a brazing material formed on the surface thereof can be used as the honeycomb core and the plate material, and a curved honeycomb panel can be manufactured by integrally bonding the plate material made of the brazing sheet and the honeycomb core.

In the case of manufacturing this curved honeycomb panel, for example, a method in which a honeycomb core having a projecting portion or a projecting portion is sandwiched between plate materials having a curved surface and then heated and brazed can be employed.

[0013]

In the invention of claim 1, since at least one of the abutting portions of the honeycomb cores facing each other is provided with a protruding portion which is protruded in the abutting portion direction and is joined to the plate member on the convex side of the curved surface, The protruding portion divides the non-support region. As a result, the curved honeycomb panel is reinforced against the bending of the curved honeycomb panel in the direction of the arrow C (see FIG. 8) to be strong, and a curved honeycomb panel having excellent rigidity and strength is obtained.

According to the second aspect of the present invention, at least one of the abutting portions of the honeycomb cores facing each other is provided with an overhanging portion projecting in the abutting portion direction and joining and fixing the abutting portions. Similar to the invention of Item 1, this protrusion divides the non-support region. Therefore, this curved honeycomb panel is reinforced against bending and becomes strong, and has excellent rigidity and strength.

[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, and FIG. 2A is an arrow D in FIG.
Fig. 3 is a side view seen from the direction, Fig. 2 (b) is a cross-sectional view in the height direction of the honeycomb core, Fig. 3 (a) is a plan view showing the honeycomb core, and Fig. 3 (b) shows the honeycomb core. It is a perspective view shown.

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 the arrow D and combined, and a protruding portion 7 is provided facing the abutting portion 5 of each core material 2a. That is, as shown in FIG. 2, the projecting portion 7 is provided on one side (the convex side of the curved surface) of the facing butting portion 5 and protrudes outward as it goes to the convex side of the honeycomb panel 1. Is formed in.

FIG. 3 shows the core material 2a before the honeycomb panel 1 is bent. The height H of the protruding portion 7 of the core material 2a is obtained by the following equation (1). still,
This optimum height H is set to the most effective height for achieving the initial purpose, and its effective range is set according to the required specifications of the panel.

H = Ch (Ct + Cs / 2) / {2 · (R + Ft)} (1) Ch: core height, Ct: core thickness, Cs: cell size (distance between opposite sides) R: concave 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. 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 having a honeycomb provided with the protruding portions 7.

Next, a flat plate 11 made of a friction reducing material is placed on the lower mold 10.
Is arranged and the face plate 4 on the convex side is arranged. Next, the core materials 2a are placed on the face plate 4 with their trapezoidal tops back to back (that is, the protrusions 7 face down). 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 is placed on the face plate 3 via the flat plate 12 of the friction reducing material. In this state, while heating, the surroundings are evacuated and the upper mold 19 pressurizes.

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 structure, the curved honeycomb panel 1 having a predetermined curvature can be easily manufactured only by sequentially combining the face plates 3 and 4 and the core material 2a. Further, since the protruding portion 7 provided in the butting portion 5 divides the non-supporting region, a curved panel having less rigidity and strength lower than that of the flat panel can be reasonably obtained. Further, since the strength of the core material 2a is improved by providing the protruding portion 7, it is possible to reduce the weight of the entire panel.

Next, a second embodiment will be described with reference to FIG. Since the second embodiment has the same structure as that of the first embodiment except the honeycomb core, the description of the other structures will be omitted. As shown in FIG. 5, in the honeycomb core 20 used in the honeycomb panel of the present embodiment, two protruding portions 22, 2 are provided at the abutting portion 21 of one core element 20a.
3 are arranged, and the other core element 20b has both protrusions 2
One protrusion 24 is provided so as to fit between the two and 23.

Therefore, in this embodiment, the same effect as that of the first embodiment is obtained, and the protrusions 22 and 2 are provided.
Since 3, 24 are arranged so as to engage with each other in a zigzag manner, there is an advantage that the workability of assembling the honeycomb core 20 is improved. Further, as in the second embodiment, the protruding portions 22, 2
When 3 and 24 are arranged in a zigzag pattern, or when a protrusion is formed only on one of the abutting portions, the height H of the protrusion is obtained by the following equation (2).

H = Ch (Ct + Cs / 2) / (R + Ft) (2) Next, a third embodiment will be described with reference to FIG.
6A shows a side view of the honeycomb panel 30, and FIG. 6B shows a perspective view of the honeycomb core 31.

As shown in FIG. 6, the honeycomb core 31 used in the honeycomb panel 30 of the present embodiment has one overhanging portion 33 at the central portion of the butting portion 32 of the core element 31a.
Are formed, and the protruding portions 33 are joined to each other, so that the facing butting portions 32 are joined and fixed to each other.

Therefore, in this embodiment, the same effect as that of each of the above-described embodiments is obtained, but in addition to this embodiment, for example, only one of the butting portions is provided with an overhanging portion, and the butting portions facing each other are provided. You may make it join with. 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.

[0029]

As described above, according to the honeycomb panel of the first and second aspects, by providing the projecting portion or the overhanging portion, compared with the flat honeycomb panel without a special increase in weight. The advantage is that a curved panel without rigidity and strength reduction can be easily obtained.

Further, in the case of the structure in which the projecting portions or the projecting portions are engaged with each other, the positioning becomes easy, and as a result, the assembling work becomes good 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 an explanatory view showing a side surface and a cross section of the honeycomb core 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 perspective view showing a honeycomb core according to a second embodiment.

FIG. 6 is an explanatory diagram showing a honeycomb core of a third embodiment.

FIG. 7 is an explanatory diagram showing a conventional example.

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

[Explanation of symbols]

 1, 30 ... Honeycomb panel 2, 20, 31 ... Honeycomb core 3, 4 ... Face plate 5, 21, 32 ... Butt portion 7, 22, 23, 24 ... Projection portion 33 ... Overhang portion

Claims (2)

[Claims] 1. A curved honeycomb panel in which plate members are joined to both end faces in the height direction of a honeycomb core, wherein at least one of the abutting portions of the honeycomb cores facing each other protrudes in the abutting portion direction and the curved surface. A curved honeycomb panel, which is provided with a protrusion that is joined to the plate material on the convex side of. 2. In a curved honeycomb panel in which plate materials are joined to both end surfaces in the height direction of a honeycomb core, at least one of the abutting portions facing each other of the honeycomb cores is protruded in the abutting portion direction. A curved honeycomb panel, which is provided with an overhanging portion for joining and fixing the joining portions.