JP3056838B2 - Honeycomb core and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a honeycomb core constituting a honeycomb panel made of metal foil or the like. The honeycomb core is generally sandwiched between two face sheets to form a honeycomb panel. Typically, the core is formed from a plurality of corrugated strips, which are secured by welding, gluing or other means to form a honeycomb structure. In addition, the face sheet is fixed to the core edge to form a honeycomb panel. Such a structure is very light and has excellent strength,
It is said that its strength greatly depends on the shape of the core. Panels using this type of honeycomb core are generally used for aircraft, ships and other transport equipment, or structural materials such as building materials.

[0002]

2. Description of the Related Art For example, a method of manufacturing a honeycomb core disclosed in Japanese Patent Application Laid-Open No. Sho 62-47711 discloses a method in which a flange integrated with a core strip is provided at an edge of a core strip used to form a core, and a flat metal plate is formed. Formed during punching of the strip into a corrugated core strip, wherein the flange is deformed to be perpendicular to the edge of the core strip. The core strip has a valley and a crest, and the bending operation causes wrinkles at the flange member valley.

[0003] In forming a honeycomb core, the core strips are arranged in a nest-like relationship by overlapping a flange of one core strip with a flange of another adjacent core strip. Generally, the flanges at the valleys of each strip are "jogged", i.e., bent slightly inward, to simplify the nesting of the core strips. The flange portion near the peak of one core strip slides over the flange at the valley of the other core strip. This results in a structure having a surface to which the face sheet is fixed.

[0004]

In the prior art described above, in order to bend the flange portion in the same direction at both ends of all the core strips, when the core strip is formed, the uppermost core strip and the core strip one stage below it are formed. In joining, wrinkles are concentrated on the valleys or peaks on the flanges, and overlap with the double or triple thickness of the flanges on the valleys or peaks in joining the core strips. For this reason, it is difficult to uniformly join the face sheet to the core strip in a later step. The present invention has been made in view of the above points, and has high uniformity and high speed bonding between core strips, and easily and stably increases the speed of bonding between a core and a face sheet in a later process. Things.

[0005]

SUMMARY OF THE INVENTION The gist of the present invention is to use a corrugated sheet made of metal foil and a flat plate having a width wider than that, and bond and laminate at least one or more sheets of the corrugated sheet. Hanikamuko a which is characterized by having a flange bent perpendicularly to the width direction of either one corrugated plate the ends of the.

[0006]

According to the present invention, in a honeycomb core in which at least one or more corrugated sheets are joined and laminated, at least one end of the corrugated sheet and a flat plate wider than the corrugated sheet is attached to the corrugated sheet. It is bent vertically by roll or press working in the width direction to form a flange, which eliminates wrinkles and breaks in the flange, facilitates the joining of face sheets when manufacturing honeycomb panels, and reduces the width of the flange. The selection has an effect of strengthening the bonding between the core and the face sheet as compared with the related art.

The shape of the corrugated sheet used in the present invention greatly affects the strength of the honeycomb core, such as a continuous curve shape such as a sine curve shape, a semicircular shape, an elliptical shape, and a trapezoidal shape. Can be selected and used.

In the method of combining a corrugated sheet and a flat plate, the minimum unit is composed of one corrugated sheet and a flat plate (FIG. 2).
The method of joining the corrugated sheet and the flat plate may be any method using adhesion, welding using an energy beam, or electric resistance welding.

The width of the flat plate is obtained by adding the width of the flange portion to the width of the corrugated plate. The width may be changed on the front surface and the back surface of the honeycomb core depending on the use of the honeycomb core. It is also possible to provide and use a flange on only one surface of the honeycomb core (FIGS. 3, 4, and 5). Furthermore, the bending direction of the flange may be perpendicular to the longitudinal direction of the corrugated plate and the flat plate, and may be U-shaped or hook-shaped (FIGS. 6 and 7).

[0010]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below are for describing the present invention in principle and, of course, do not have a meaning to limit the present invention. It is best determined by reference to the claims of the present invention.

The material used in this embodiment is made of stainless steel or a titanium alloy and has a thickness of 100 μm.
These are: The size when formed into a honeycomb panel depends on the product, but one side is about 150m
It is a square of m or more.

Using the thus formed stainless steel material, a honeycomb core was formed by joining a corrugated plate and a flat plate by spot welding using a YAG laser which is one of the energy beams (FIG. 8). This honeycomb core has a side of 2
It is a square of 00 mm, and the thickness of both the corrugated plate and the flat plate is 10
0 μm and its height was 20 mm. The method of bending the flange of the honeycomb core formed by the above-described method is performed by an apparatus including a drive roll and a squeeze roll.

The flange bending step will be described below with reference to a conceptual diagram. FIG. 9A is an explanatory view from the top of the flange forming step, and FIG. 9B is an explanatory view from the side of the flange forming step. The squeeze rolls 9 and 9a push down the flange portions 3 'and 4' of the honeycomb core 2 with the rolling force F and bend the flange portions in a direction perpendicular to the core portion to form the straight flanges 3 and 4. In addition, this squeeze roll is in a state of being inclined perpendicularly or several degrees with respect to the direction of pulling out the honeycomb core. The rolls 12 and 12a are used for driving the core panel at a speed V by a driving roll. The drawing speed is determined by the thickness of the bent portion of the flange. In this case, the rolling force of the squeeze roll is 20
kg-f, and the core panel withdrawal speed is 1.
2 m.

FIG. 1 is a conceptual diagram of a honeycomb core formed in this embodiment. When a compression test was performed on this honeycomb core, the maximum compressive load was about 6 tons.
The above compression test shows that the honeycomb core of this embodiment is very strong.

[0015]

The present invention provides a honeycomb core and a method of manufacturing the same in the manufacture of a honeycomb panel, and there is no problem of wrinkling, overlap of flanges, and connection between flanges due to a conventional forming method, and therefore, a core strip. The joining between them is fast and stable. As a result, the flange width required for joining with the face sheet can be increased, and furthermore, since the surface becomes flat, the joining between the face sheet and the core strip is uniform and defect-free, and the strength of the honeycomb panel is greatly improved.
In addition, the manufacturing time can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a honeycomb core. FIG. 2A is a conceptual diagram of a honeycomb core of a minimum unit. FIG. 2B is a cross-sectional view of SS ′ in FIG. 2A. FIG. 3A is a honeycomb having no flange on one surface. Core FIG. 3B is a cross-sectional view of SS ′ in FIG. 3A FIG. 4 is a honeycomb core having the same flange width on both sides FIG. 5 is a honeycomb core having a different flange width on one side FIG. 6A is a honeycomb formed by a U-shaped flange 6 (b) is a cross-sectional view of SS ′ in FIG. 6 (a). FIG. 7 (a) is a conceptual view of a honeycomb core formed by hook-shaped flanges. FIG. 7 (b) is a cross-sectional view of SS ′ in FIG. 7 (a). FIG. 8 is a honeycomb core before a flange bending operation. FIG. 9A is a plan view of a method of forming a flange. FIG. 9B is a side view of a method of forming a flange.

[Explanation of symbols]

 2: Honeycomb core 3: Honeycomb core flange 3 ': Flange before bending operation 4: Honeycomb core flange 4: Flange before bending operation 9: Squeeze roll 9a: Squeeze roll 12: Driving roll 12a: Driving roll 21 : Flat honeycomb core strip 22: Corrugated honeycomb core strip F: Rolling force of flange bending operation V: Speed of flange bending operation

Continuation of front page (72) Inventor Masashi Oikawa 5-10-1 Fuchinobe, Sagamihara City, Kanagawa Prefecture Nippon Steel Corporation Electronics Research Laboratory (58) Fields investigated (Int. Cl. ⁷ , DB name) B32B 1/00 -35/00 B21D 47/00

Claims (1)

(57) [Claims] 1. A honeycomb core comprising a corrugated plate and a flat plate, using a flat plate wider than the corrugated plate, bonding and laminating at least one or more corrugated plates and a flat plate, and bonding at least one end of the flat plate. A honeycomb core having a flange bent perpendicularly to a width direction of a corrugated sheet.