JPH07189416A - Brazed aluminum honeycomb panel - Google Patents

Abstract

PURPOSE:To provide a firm brazed joint throughout the whole of a honeycomb panel by a method wherein a honeycomb core at the central part of an aluminum honeycomb panel is formed of a core material being thicker compared with a honeycomb core at an end part. CONSTITUTION:In a honeycomb core having length L and width H, a honeycomb core at a central part L2xH in the direction of length is formed of a core material being thicker compared with a honeycomb core at end parts L1xH and L3xH. Face sheets formed of an aluminum brazing sheet are disposed on the obverse and the reverse of the honeycomb core and assembled in the shape of a honeycomb panel and heated and integrally brazed to a brazed aluminum honeycomb panel. This constitution forms the honeycomb at a central part in a state that a space per a unit area is further reduced, improves heat transfer ability, performs sufficient transfer of heat in a furnace to the central part of a laminated honeycomb panel, and provides a brazed joint, having a high joining strength, throughout the whole of the honeycomb panel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brazed aluminum honeycomb panel, more specifically, a honeycomb core formed by bending and superposing a sheet of aluminum (including aluminum alloy; the same applies hereinafter) and a brazing sheet. A face plate made of an aluminum brazing sheet is placed in the assembly to assemble into a honeycomb panel shape, and heating,
The present invention relates to a brazed aluminum honeycomb panel formed by brazing.

[0002]

2. Description of the Related Art As shown in FIG. 3, an aluminum honeycomb panel 1 is a laminated body in which aluminum face plates 3 and 4 are joined to the upper and lower surfaces of an aluminum honeycomb core 2, and in particular, the upper and lower sides of the aluminum honeycomb core. Aluminum brazed honeycomb panels, which have aluminum face plates on both sides and are integrally brazed, can be welded and processed such as bending, so that they can be used in various fields such as construction, vehicles, automobiles and ships. It is supposed to be used.

Conventionally, an aluminum honeycomb panel having a panel thickness (core height) of 20 to 30 mm has been used, but recently, with the expansion of applications of the aluminum honeycomb panel, for example, a panel thickness of 50 to 120 mm. Things are becoming required. When manufacturing such an aluminum panel by brazing and joining, a core material made of an aluminum sheet or an aluminum brazing sheet is polymerized to form a honeycomb core,
Face plates made of aluminum brazing sheets are placed on the upper and lower surfaces of this honeycomb core, assembled into the shape of a honeycomb panel, laminated and fixed with a jig, and heated to a brazing temperature in a non-oxidizing atmosphere furnace such as a vacuum furnace. To do.

[0004]

However, particularly when a honeycomb panel having a large panel thickness is to be heated and brazed in a furnace, it is difficult to heat the central portion of the laminated honeycomb panels and the brazing does not melt sufficiently. Therefore, there is a problem that a brazing joining failure occurs.

The present invention has been made to solve the above-mentioned problems in brazing aluminum honeycomb panels in a furnace in a brazed aluminum honeycomb panel, and an object thereof is to assemble into a honeycomb panel shape and to braze. When the honeycomb panel is charged into a brazing furnace and heated and brazed, the central portion of the honeycomb panel is sufficiently heated as well as the peripheral portion, so that uniform and strong brazing joining is performed on the entire honeycomb panel. An object is to provide an aluminum honeycomb panel.

[0006]

To achieve the above object, a brazed aluminum honeycomb panel according to the present invention comprises a core material made of an aluminum sheet or an aluminum brazing sheet, which is polymerized into a honeycomb core shape, and aluminum is vertically formed. Place a face plate made of brazing sheet, assemble in the shape of a honeycomb panel, heat,
In a brazed aluminum honeycomb panel formed as a brazed unitary body, the honeycomb core in the central portion of the aluminum honeycomb panel is formed of a thicker core material than the honeycomb cores at the ends, and / or compared to the honeycomb cores at the ends. It is characterized by having a fine cell size.

In one embodiment of the present invention, a core material made of an aluminum sheet or an aluminum brazing sheet having a brazing material layer on both sides is cut into a predetermined width and bent, and polymerized to form a honeycomb core. If necessary, aluminum shape members are arranged at the side end portions of the core, face plates made of aluminum brazing sheets are arranged above and below to assemble into a honeycomb panel shape, and the assembled honeycomb panels are laminated and cured. In an aluminum honeycomb panel formed by restraining with a tool, heating in a vacuum furnace and heating to a temperature above the melting point of the brazing material, and brazing, the honeycomb core at the center of the honeycomb panel is the honeycomb core at the end. The core material is thicker than

For example, as shown in FIG. 1, length L and width H
In the above honeycomb core, the honeycomb core in the central portion L ₂ × H in the length direction is formed of a thicker core material than the honeycomb cores in the end portions L ₁ × H and L ₃ × H. The honeycomb core in the central portion H ₂ × L in the width direction is attached to the end portion H ₁
The core material may be made thicker than the honeycomb core in the portions of × L and H ₃ × L, or only the honeycomb core in the central portion L ₂ × H ₂ may be made of the thick core material.
To increase the thickness of the core material, an aluminum sheet or an aluminum brazing sheet having a large sheet thickness may be used, and a plurality of aluminum sheets or aluminum brazing sheet sheets may be used in a stacked manner.

In another embodiment of the present invention, as shown in FIG. 2, in a honeycomb core having a length L and a width H, the honeycomb core at the central portion L ₂ × H in the length direction is replaced with the end portion L.
_It has a smaller cell size than the honeycomb core in the ₁ × H and L ₃ × H portions. If necessary, a boundary plate made of an aluminum plate or the like is inserted at the boundary between the honeycomb cores having different cell sizes. By inserting the boundary plate, the cell size of the honeycomb core in the central portion in the width direction can be made smaller, and the cell size in the central portion of the honeycomb core can be made smaller than that in the peripheral portion.

As described above, the honeycomb core in the central portion of the honeycomb panel is made of a core material having a large thickness, or the cell size of the honeycomb core in the central portion is made small, so that the heat conductivity of the central portion is improved. As a result, the center part of the laminated part of the laminated honeycomb panel has the same heat transfer characteristics as the end part or the peripheral part, and the entire honeycomb panel is uniformly heated in the brazing furnace to perform uniform brazing and bonding. Be seen. Usually, either the method of molding the honeycomb core in the central portion of the honeycomb panel from a thick core material or the method of configuring the central portion of the honeycomb panel with a honeycomb core having a fine cell size is used. When brazing a large honeycomb panel in a furnace, both of the above methods can be used together.

[0011]

According to the structure of the present invention, the honeycomb honeycomb body at the center of the brazed aluminum honeycomb panel is formed by assembling and stacking aluminum honeycomb panels and heating and brazing in a non-oxidizing atmosphere furnace such as a vacuum furnace. The core
Since the structure has less space per unit volume and excellent heat transfer, the heat in the furnace can be sufficiently transferred to the central part of the laminated honeycomb panels, and the bonding strength will be high throughout the honeycomb panel. A glued joint is obtained.

[0012]

EXAMPLES Examples of the present invention will be described below. Example 1 As shown in FIG. 1, the central portion of the honeycomb core, L ₂ 1m × H
1m part is aluminum brazing sheet BA24PC (thickness 1.0mm, brazing material clad rate 5% on one side, core material 6951 alloy,
Brazing material 4045 alloy, double-sided clad material, sheet width 98 mm) is bent, polymerized and arranged in the shape of a honeycomb core with a cell size of 3/4 inch, and the end portion of the honeycomb core L _{1 1} m × H
The portion of 1 m, L ₃ 1 m × H 1 m was formed by bending the aluminum brazing sheet BA24PC having a thickness of 0.2 mm, superposing it, and arranging it in the shape of a honeycomb core having a cell size of 3/4 inch.

A face plate made of an aluminum brazing sheet BA23PC (thickness 1.0 mm, brazing material clad ratio 5%, core material 6951 alloy, brazing material 4045 alloy, single-sided clad material) is arranged on both upper and lower surfaces of the honeycomb core, and FIG. As shown in FIG. 5, the honeycomb panel was assembled into a shape of a honeycomb panel having a core size of L3m × H1m.
The assembled honeycomb panels were stacked in three layers, charged into a vacuum brazing furnace, and heat brazed to produce an aluminum honeycomb panel having a length L1 m × width H1 m × thickness 100 mm. The length L of the honeycomb panel was charged in the lengthwise direction of the vacuum brazing furnace.

After the brazing, the samples were cut out from several portions of the end portions L ₁ × H, L ₃ × H and the central portion L ₂ × H of the joined aluminum honeycomb panels to form a face plate and a core. When the brazing part was examined, formation of a sufficiently wide residual width of the brazing was found in the brazing part between the upper face plate and the honeycomb core and between the lower face plate and the honeycomb core. When a tensile test was performed on the brazed part, it was found that the material part broke and a brazed part with excellent bonding strength was formed.

The same core material as in Example 1 (thickness 0.2 m
m) and the face plate, assembled into the shape of a honeycomb panel having the same size, stacked in three stages, placed in a vacuum brazing furnace, and heated and brazed to produce an end portion L _{1 of} the honeycomb panel. samples were cut out from the portion and the portion of the central portion L ₂ × H of × H and L ₃ × H, was investigated brazed portion between the face plate and the core, the second stage of the laminated honeycomb panels in three stages Central part of the arranged honeycomb panel (L ₂ ×
In the honeycomb core portion of the (H portion), particularly in the width H direction, there was a portion where the brazing material was not melted. The residual width of the brazing filler metal in the brazing portion between the face plate and the honeycomb core at these points was narrow, and when a tensile test was conducted on the brazing portion, the brazing portion broke.

[0016]

As described above, in the aluminum honeycomb panel of the present invention, when assembling and brazing in the furnace, heat is transferred to the central portion of the honeycomb panel in a short time and the same as the peripheral portion. A brazing joint having a sufficiently large residual width can be obtained, and even if the panel thickness (core height) is large, a brazing joint having excellent joint strength can be formed over the entire panel.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an embodiment of an arrangement of honeycomb cores in the present invention.

FIG. 2 is a schematic plan view showing another embodiment of the arrangement of honeycomb cores in the present invention.

FIG. 3 is a perspective view in which a part of the honeycomb panel is cut away.

[Explanation of symbols]

 1 Honeycomb panel 2 Honeycomb core 3 Face plate 4 Face plate L Length of honeycomb core H Width of honeycomb core

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Takeaki Baba 5-11-3 Shimbashi, Minato-ku, Tokyo Sumitomo Light Metal Industry Co., Ltd. (72) Inventor Hironori Kondo 5-11-3 Shimbashi, Minato-ku, Tokyo No. Sumitomo Light Metal Industry Co., Ltd. (72) Inventor Keizo Namba 5-11-3 Shimbashi, Minato-ku, Tokyo Sumitomo Engineering Co., Ltd.

Claims (1)

[Claims] 1. A honeycomb core is formed by polymerizing a core material made of an aluminum sheet or an aluminum brazing sheet, and face plates made of the aluminum brazing sheet are arranged above and below to assemble into a honeycomb panel shape, which is integrated with heating and brazing. In the brazed aluminum honeycomb panel formed as, the central portion of the honeycomb core of the aluminum honeycomb panel is formed of a core material thicker than the end honeycomb core, and / or finer than the end honeycomb core. A brazed aluminum honeycomb panel having a cell size.