JPH0947867A - Brazed honeycomb panel and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a brazed honeycomb panel having sufficient joined strength by facing a joining part of frame material, which is arranged to the end edge part of honeycomb core, to the same height with that of the honeycomb core. SOLUTION: A brazed honeycomb panel 1 is made through that frame materials 3 are arranged to the end edge part of a honeycomb core 2, face sheets 4 are arranged on the upper/lower faces of core and these are integrally brazed. The joining faces of frame materials 3 arranged to the end edge part of honeycomb core 2 to the face sheets 4 are faced to the same height as that of the honeycomb core 2. The honeycomb 2 is formed with aluminum sheet or aluminum foil, the frame material 3 is formed with aluminum extruded shape, the face sheet 4 with aluminum brazing sheet. By this method, production time is greatly reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brazed honeycomb panel, particularly an aluminum brazed honeycomb panel formed by combining an aluminum honeycomb core, a frame material made of an aluminum extruded shape member, and a face plate made of an aluminum brazing sheet. And a manufacturing method thereof.

[0002]

2. Description of the Related Art As shown in FIG. 1, a brazed honeycomb panel has a honeycomb core 2 having a frame material 3 disposed on the edge thereof, and a core and a face plate 4 disposed on the upper and lower surfaces thereof. In the case of the aluminum brazed honeycomb panel 1, which is integrally brazed, its manufacture is performed by forming aluminum on the edge portion of the honeycomb core 2 formed of a foil or a thin plate of aluminum (including an aluminum alloy; the same applies hereinafter). A frame material 3 made of an extruded shape is welded to form a honeycomb core 2
A face plate 4 made of an aluminum brazing sheet is placed on the upper and lower surfaces P (FIG. 2) of the brazing furnace so as to overlap the honeycomb core 2 and the frame material 3, and these are integrally fixed by a jig. And the face plate 4 and the honeycomb core 2 and the face plate 4 and the frame member 3 are integrally brazed. Also between the honeycomb core 2 and the frame material 3, brazing is partially performed by the brazing fluid flowing from the face plate 4 and the honeycomb core 2.

Since a brazed honeycomb panel is used as a structural member for building materials, vehicles, etc., it must have sufficient strength characteristics. Therefore, a honeycomb core,
It is important that the frame material and the face plate are completely brazed and integrated, but it has often been experienced that defective bonding occurs between the honeycomb core and the face plate or between the frame material and the face plate. As a result of analyzing and examining many cases of this cause, the inventors found that, particularly in the adjacent portions of the frame material and the honeycomb core, and in the abutting portions of the frame materials at the corner portions of the honeycomb core, the dimensions are slightly small. However, it has been clarified that when a step is formed, a gap is often formed between the step plate and the face plate, resulting in poor bonding.

Further, as a result of a detailed examination of the cause of the bonding failure in the manufacture of the above-mentioned aluminum brazed honeycomb panel, as will be described below, the stepped portion has a dimensional accuracy of the frame material made of an extruded profile and a frame material assembled. It has been found that it is likely to be formed due to the work method for attaching, and the surface texture of the extruded shape also affects brazing and joining. (1) Since the dimensional accuracy of the extruded aluminum profile varies within ± 0.3 mm (JIS 1st class tolerance), a step is created especially at the corners of the honeycomb core, where the frame members abut each other. Is difficult to avoid, and a gap is formed between the frame member having a lower height and the face plate, resulting in poor brazing.

(2) If there is a variation in the above-mentioned dimensional accuracy, when the frame material is arranged at the edge of the honeycomb core, the height of the frame material and the height of the honeycomb core are likely to differ from each other. That is, when the frame material is lower than the honeycomb core, a gap is created between the face plate and the frame material, resulting in brazing failure. When the height of the frame material is larger than the height of the honeycomb core, a gap is created between the face plate and the honeycomb core, and the face plate is not brazed to the honeycomb core.

(3) Since the aluminum extruded profile forming the frame material is extruded hot, the surface is covered with a relatively dense and thick oxide film. This oxide film hinders the brazing property and has a great influence particularly when surface bonding is required. Attempts have been made to remove the oxide film by etching with acid or alkali, but this is not a sufficient countermeasure.

(4) Since the work of assembling the frame materials with each other is usually performed manually, the adjustment of the step formed at the abutting portion of the frame materials is often not sufficient, and at the time of brazing and joining. Due to incompleteness of the jig for restraining the honeycomb panel, a step is likely to occur at the abutting portions of the frame materials at the corner portions of the honeycomb core, which causes brazing failure.

(5) The frame material for assembling the frame material to the edge portion of the honeycomb core is fixed to the frame material by spot welding or by welding the sides of the frame material. In the case of an extruded shape material, if welding conditions are inappropriate even a little, thermal distortion may occur in the welded portion, and twisting may occur in the frame material, which causes brazing failure.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems in a brazed honeycomb panel, particularly an aluminum brazed honeycomb panel, and its object is to provide a honeycomb core and a face plate. It is an object of the present invention to provide a brazed honeycomb panel that is completely brazed and integrated, particularly an aluminum brazed honeycomb panel, and a manufacturing method thereof, without causing defective brazing between the frame and the face plate.

[0010]

In order to achieve the above object, a brazing honeycomb panel according to the present invention is provided with a frame material at the edge portions of the honeycomb core, and the honeycomb core has upper and lower surfaces with the honeycomb core. In a brazed honeycomb panel in which face plates are arranged so as to overlap with the frame material, and these are integrally brazed and joined together, the frame material disposed at the edge of the honeycomb core is joined to the face plate. The structural feature is that the surface is chamfered at the same height as the honeycomb core.

The second feature of the brazed honeycomb panel of the present invention is that the honeycomb core is formed of an aluminum plate or an aluminum foil, the frame material is formed of an extruded aluminum material, and the face plate is formed of an aluminum brazing sheet. And

In the method for manufacturing a brazed honeycomb panel according to the present invention, a frame material, in which the bonding surface to the face plate is chamfered at the same height as the honeycomb core, is arranged at the edge portion of the honeycomb core, and the honeycomb core is formed. The first feature is that the face plates are arranged on the upper and lower surfaces of the honeycomb core in a state where the honeycomb core and the frame material are superposed on each other, and are brazed by heating.

The second and third characteristics of the method for manufacturing a brazed honeycomb panel according to the present invention are that frame materials are welded to each other to form a frame, and the surface to be joined to the face plate is chamfered after the frame formation, and The honeycomb core is formed of an aluminum plate or an aluminum foil, the frame material is formed of an extruded aluminum material, and the face plate is formed of an aluminum brazing sheet.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION As described above, the brazed honeycomb panel of the present invention is arranged at the end edge of the honeycomb core, and is formed in the corners of the honeycomb core of the frame material to be framed, but at the abutting portions of the frame materials. There is no step, there is no step in the adjacent part between the honeycomb core and the frame material, and the core surface and the face plate are brazed and joined together without any gap, so that there is no defective joint and they are completely integrated. It achieves the brazing joint.

A preferred embodiment in the practice of the present invention will be described with respect to an aluminum brazed honeycomb panel. When extruding an aluminum extruded profile serving as a frame material, the thickness of the profile surface to be brazed and joined to the face plate is set. , Extruded as a wall thickness with an extra cutting allowance, and (a) After extrusion, the face plate of the extruded profile is face-polished with a means such as an end mill or shaper to be brazed, and When the heights are the same, the height of the frame material is the same as the height of the honeycomb core, and the frame material is arranged at the end edge of the honeycomb core, when the corner materials of the honeycomb core are abutted with each other and the honeycomb core is A step is not formed in the portion adjacent to the frame member, and the core surface and the face plate are brazed and joined together without any gap.

(B) In the case of manufacturing a curved honeycomb panel, after extruding a frame material which is a frame material, the profile surface to be brazed with the face plate is chamfered to eliminate the step like the above. , So that the core surface and the face plate are brazed together without any gap. (C) Most preferably, after extruding a frame material to be framed by welding, the face plate of the framed frame material and the surface of the frame material to be brazed are chamfered to obtain the height of the frame material and the honeycomb core. Make it the same as the height so that there are no steps
Make sure that the core surface and the face plate are brazed without any gap.

By manufacturing the brazed honeycomb panel in the above-described mode, a step is not formed at the abutting portions of the frame members at the corners of the honeycomb core, and a step is formed between the honeycomb core and the frame member. It is also avoided that there is no gap formed between the core surface and the face plate, and the defective joint is eliminated. By chamfering the surface of the profile to be brazed to the face plate, the dense and thick oxide film generated on the surface of the aluminum extruded profile during hot extrusion is also removed. Can be seen. The frame material may have various cross-sectional shapes such as a square shape and a square shape.

[0018]

EXAMPLES Examples of the present invention will be described below together with comparative examples. Example 1 An aluminum extruded profile 5 (set dimensions: width 30 mm, height 35 mm, length 150 mm) having a hollow rectangular cross section as shown in FIG. 3 was used as the brazing surface 9 and the brazing surface was shaped by a shaper.
The surface of the extruded profile 5 is ground to a thickness of 3.0 mm, and the brazing surface 9 of the extruded profile 5 is made of aluminum brazing sheet 6 (thickness: 1.0 mm, brazing material: Al-10% Si-). 1.
0% Mg, clad ratio: 10%, single-sided clad)
At the end of the brazing surface 9 of the extruded shape, an aluminum plate (thickness: 0.1 mm) is inserted as a spacer between the brazing sheet 6 and the brazing surface 9, and fixed with a jig, and vacuum brazed. 59 in an attachment furnace (vacuum degree when heated to 590 ° C: 1.3 × 10 ^-3 Pa)
It was heated to a temperature of 0 ° C. and held for 5 minutes, cooled to 550 ° C. in the furnace and taken out.

As shown in FIG. 3, the unbonded portion 8 with the spacer interposed is lifted, and this portion is used as a gripping piece to perform a peel test in which the gripping piece is pulled up in the direction of arrow A at 10 mm / min. The peel strength T (= S / l, where S is the area and 1 is the length) for peeling the joint surface 7 after brazing was measured from the strength change shown. Moreover, the brazing part of the brazing surface 9 of the extruded profile 5 from which the brazing sheet 6 was peeled off was subjected to image analysis to calculate the bonding rate. The result is peel strength
Excellent value of 462N and bonding rate of 84% was shown.

Comparative Example 1 In Example 1, as the extruded profile, the set dimension was 30 m in width.
m, height 35 mm, length 150 mm was manufactured, and the upper surface was used as the brazing surface 9, and the brazing surface 9 was left in the extruded state. Two types of the etched ones were produced, brazed under the same conditions as in Example 1, and then subjected to a peel test in the same manner as in Example 1 and the bonding rate was obtained. As a result, when the brazing surface 9 is in the extruded state, the peel strength is 208 N, the bonding rate is 37%, and when the brazing surface 9 is acid-etched, the peel strength is 265.
With N and a bonding rate of 41%, the peel strength was 300 N or less and the bonding rate was 60% or less. Although the brazing surface 9 was ground, an attempt was made, but it was almost the same as the etched one.

Example 2 Using a honeycomb core 2 made of aluminum, a frame material 3 made of extruded aluminum profile, and a face plate 4 made of the aluminum brazing sheet of Example 1, a flat honeycomb panel 1A (target dimension: L2000mm, W1000mm, H30m
m) and curved honeycomb panel 1B as shown in FIG.
(Target dimensions: L2000mm, W1000mm, H30mm, radius of curvature R
(2000 mm). The frame material 3 used is
After extruding, the brazing surface was chamfered with a shaper by 0.5 mm, and the extruded shape was used as a frame material by welding, and then the brazing surface and the weld bead surface were machined by 0.5 mm. The honeycomb core is obtained by cutting an aluminum brazing sheet into fine pieces and processing it into a corrugated shape, and using the core material as the core material. The honeycomb cores are arranged so that the peaks and valleys of adjacent core materials are in contact with each other.

The assembled honeycomb panels 1A and 1B were pressed from above and below by carbon plates, and a weight made of stainless steel was placed on the honeycomb panels 1A and 1B, which were placed in the vacuum brazing furnace used in Example 1 at 590 ° C. Hold at temperature for 5 minutes and 550 in furnace
The plate was cooled to 0 ° C., taken out, the face plate 3 was peeled off, and the brazing portion of the brazing surface of the frame member 3 was subjected to image analysis to calculate the bonding rate. The results are shown in Table 1. As shown in Table 1, the bonding rates were all excellent values exceeding 90%. In particular, the frame material cut after welding was extremely good.

[0023]

[Table 1]

Comparative Example 2 In Example 2, as the frame material 3, an aluminum extruded shape material in the state of hot extrusion was applied, and a flat honeycomb panel 1A and a curved honeycomb panel 1B were prepared in the same manner as in Example 2. After manufacturing, the bonding rate was calculated in the same manner as in Example 2. Table 2 shows the results. As can be seen from Table 2, in the as-extruded shape members, due to the dimensional accuracy, there is a step in the butted portion between the shape members, and the brazing property is impeded by the presence of the oxide film. The sex is inferior.

[0025]

[Table 2]

[0026]

As described above, according to the present invention, the brazing property of the brazed honeycomb panel, particularly the aluminum brazed honeycomb panel is improved, the defective bonding is greatly improved, and the brazing having sufficient bonding strength is achieved. A honeycomb panel is obtained. Further, unlike the conventional case, it is not necessary to cut the honeycomb core according to the height of the frame material, and the frame material may be chamfered according to the height of the honeycomb core cut to a predetermined dimension, which significantly reduces the construction period. Can be shortened.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a part of a brazed honeycomb panel.

FIG. 2 is a sectional view showing an assembling process of a brazed honeycomb panel.

FIG. 3 is a perspective view showing a test piece of a peel test in the present invention.

FIG. 4 is a chart showing changes in peel strength in the length direction in a peel test.

FIG. 5 is a perspective view showing a flat honeycomb panel with a part thereof cut away.

FIG. 6 is a perspective view showing a curved honeycomb panel with a part thereof cut away.

[Explanation of symbols]

 1 Brazing Honeycomb Panel 1A Flat Honeycomb Panel 2B Curved Honeycomb Panel 2 Honeycomb Core 3 Frame Material 4 Face Plate 5 Extruded Profile 6 Brazing Sheet 7 Brazing Bonding Surface 8 Unbonded Part (Grip Piece) 9 Brazing Surface P Honeycomb Core Top and Bottom Surfaces

Front Page Continuation (72) Inventor Keizo Namba 5-11-3 Shimbashi, Minato-ku, Tokyo Sumikari Engineering Co., Ltd. (72) Inventor Yasunaga Ito 5-11-3 Shimbashi, Minato-ku, Tokyo Live At Light Engineering Co., Ltd.

Claims (5)

[Claims] 1. A frame material is arranged at an edge portion of a honeycomb core, and face plates are arranged on the upper and lower surfaces of the honeycomb core so as to overlap the honeycomb core and the frame material so as to integrate them. In a brazed honeycomb panel obtained by joining by joining, the joining surface of the frame material arranged at the edge portion of the honeycomb core to the face plate is chamfered at the same height as the height of the honeycomb core. Honeycomb panel. 2. The brazed honeycomb panel according to claim 1, wherein the honeycomb core is formed of an aluminum plate or an aluminum foil, the frame material is formed of an extruded aluminum material, and the face plate is formed of an aluminum brazing sheet. . 3. A frame material, the surface of which is joined to a face plate, is chamfered to have the same height as the honeycomb core is arranged at the edge of the honeycomb core, and the honeycomb core and the frame are provided on the upper and lower surfaces of the honeycomb core. A method for manufacturing a brazed honeycomb panel, which comprises arranging a face plate in a state of being superposed on a material and performing heat brazing. 4. The method for producing a brazed honeycomb panel according to claim 3, wherein the frame members are welded to each other to form a frame, and after the frame is assembled, the bonding surface to the face plate is chamfered. 5. The brazing according to claim 3, wherein the honeycomb core is formed of an aluminum plate or an aluminum foil, the frame member is formed of an extruded aluminum material, and the face plate is formed of an aluminum brazing sheet. Is the method of manufacturing the panel.