JP3139912B2 - Honeycomb panel - 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 panel made of a metal such as stainless steel or titanium. The honeycomb panel having such a structure is very light and has excellent strength. This type of honeycomb panel is used for aircraft, ships, vehicles and the like.

[0002]

2. Description of the Related Art A method for obtaining a honeycomb panel having a curved surface is disclosed in Japanese Patent Application Laid-Open No. Hei 5-212577.
The core constituting the honeycomb panel is limited to a superplastic metal material. In this prior art, the core needs to be formed into a curved surface to be obtained in advance, and the face sheet sandwiching the core from both ends also needs to be formed into a curved surface, which is troublesome. Instead, it is required to prepare a jig such as a core mold for each curved surface to be obtained.

[0003]

SUMMARY OF THE INVENTION The present invention makes it possible to provide a honeycomb panel capable of easily obtaining a desired curved surface such as a wing shape.

[0004]

The gist of the present invention is as follows. In a honeycomb panel consisting of a corrugated core and a face sheet sandwiching it from both ends, it was formed in advance.
Same pattern repeat the height and pitch Do Ri because it is varied depending on the location of the pitch of the constant <br/> wave plate to form said core, joined to the core by deforming mating face sheet to the corrugated shape, wave A honeycomb panel having a two-dimensional shape whose thickness changes in a direction perpendicular to a wave of a plate.

FIG. 1 is an explanatory view showing an example of a first honeycomb panel of the present invention. In the drawing, reference numeral 1 denotes a honeycomb panel of the present invention, 2 denotes a core, and 3 denotes a face sheet. The honeycomb panel 1 is formed of a pair of face sheets 3 serving as outer plates on upper and lower surfaces, and a corrugated sheet called a core 2 formed by repeating the same pattern sandwiched between the face sheets. The honeycomb core 2 and the face sheet 3 are joined by bonding or welding. A method for obtaining such a curved honeycomb panel will be described below with reference to the drawings.

FIGS. 2A and 2B are explanatory views showing the shape of the core of the first honeycomb panel of the present invention shown in FIG . The core 2 is usually formed from a flat plate into a corrugated plate by press working or roll forming. Although the corrugated sheet shown in the figure has a continuous trapezoidal shape, a corrugated sheet having a continuous shape of an arc or a continuous shape of a sine curve may be used. (A) In the figure, l ₁ to l ₆ correspond to the oblique sides of the trapezoid, W ₁ to W ₇ correspond to the upper base of the trapezoid, and (b) θ ₁ to θ _{12 in the} figure correspond to the trapezoid. Hypotenuse and trapezoid top
Alternatively, although not shown in the figure, it corresponds to the angle formed by the trapezoidal lower base. P ₁ and P ₂ are lengths corresponding to the pitch of the corrugated shape, and h ₁ to h ₁₂ are lengths corresponding to the height of the trapezoid. These l _n , W _n , θ _n , P _n and h _n are constant in the above-described press working or roll forming work, and the corrugated pitch P _n , W _n corresponding to the upper base of the trapezoid, and the trapezoid The relationship between l _n corresponding to the hypotenuse, the angle θ _n formed between the hypotenuse of the trapezoid and the lower base thereof, and the length h _n corresponding to the height of the trapezoid can be expressed by the following equation. _{P n = 2 × (W n} + l n × cosθ n) h n = l n × sinθ n

From these relationships, it is easy to change P _n and h _n by changing the angle θ _n between the hypotenuse of the trapezoid and the lower base thereof. In FIG. 2, the subscript n
Becomes larger, the value of θ _n becomes smaller (θ _{n + 1}
<Θ _n ), the height of the core is reduced (h _{n + 1} <h _n ), and the pitch is increased (P _{n + 1} <P _n ). Thus method of changing the angle theta _n trapezoidal oblique side and its lower base can be easily realized by making the preformed corrugated elastically or plastically deformed. An example in which the height of the core is changed stepwise by such a method is the honeycomb panel of the present invention shown in FIG.

FIGS. 1 and 2 show an example of the honeycomb panel of the present invention. However, any means such as bonding may be used for joining the core and the face sheet, which is a necessary step in manufacturing these honeycomb panels. Alternatively, welding using an energy beam, electric resistance welding, or the like may be used.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the honeycomb panel of the present invention will be described below. The face sheet and the core are made of commonly used S
US304 was used. The thickness of both plates is 2 mm for the face sheet and 0.3 mm for the core. Facesheet size is 300mm x 300mm, core pitch is 50m
m, the height of the core is 25 mm. θ was selected such that the maximum difference within the same panel was within 15 degrees with respect to 60 degrees, and the entire honeycomb panel changed secondarily. In addition, a press machine is used for manufacturing the core. The corrugated core has a large degree of freedom in one direction,
Therefore, the secondary curved surface can be easily formed without a mold.

A laser beam, which is a typical energy beam, is used for joining the core and the face sheet. Laser processing machine is YAG laser, using optical fiber optics,
The optical system is inserted inside the panel, and the core and the face sheet are joined from the inside of the panel. At this time, the irradiation conditions were an output of 400 W and a scanning speed of 0.1 m / min.
Under these welding conditions, the penetration depth into a 2 mm-thick face sheet was about 0.5 mm, and extremely strong welding was achieved.

[0011]

According to the honeycomb panel of the present invention, an arbitrary curved surface such as a wing shape can be easily obtained without requiring a jig such as a mold.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment of a honeycomb panel according to the present invention.

FIG. 2 is an explanatory view showing a method for obtaining a honeycomb panel of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Honeycomb panel 2 Core 3 Face sheet l Oblique side of trapezoidal core θ Angle corresponding to the angle between the oblique side of trapezoidal core and lower base W Length corresponding to the upper base of trapezoidal core h Core height P Core pitch

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B32B 1/00-35/00

Claims (1)

(57) [Claims] 1. A honeycomb panel comprising a corrugated core and facesheets sandwiching the core from both ends, the honeycomb panel is formed in advance.
Repeatedly because Do Ri height and pitch of the same pattern that forms
The core is formed by changing the pitch of a constant corrugated sheet depending on the location, and the face sheet is deformed according to the corrugated sheet shape and joined to the core, and the thickness of the corrugated sheet changes in the direction perpendicular to the wave Done 2
A honeycomb panel having a three-dimensional shape.