JP2801155B2 - Manufacturing method of aluminum 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 method for manufacturing an aluminum honeycomb panel used for a vehicle, a ship, an outer wall of a building or the like by vacuum brazing. In the present invention, aluminum is intended to include not only pure aluminum but also aluminum alloy.

[0002]

2. Description of the Related Art As shown in FIG. 1, an aluminum brazed honeycomb panel 10 has an outer frame la formed by a plurality of reinforcing members 1, a honeycomb core 2, and face plates 3 and 4 integrated by a vacuum brazing method or the like. It is constituted by attaching. Of these, when brazing between the reinforcing material 1 and the face plates 3 and 4 is insufficient, defects such as swelling and peeling occur in the face plate in welding for connecting panels after brazing, It becomes difficult to secure the necessary bonding strength.

In order to improve the brazing property between the reinforcing member and the face plate, a large number of grooves are provided on the surface of the reinforcing member.
There is known a technique in which the contact area between the reinforcing material and the face plate is reduced so that even if the pressing force at the time of joining is low, it is sufficient (Japanese Utility Model Laid-Open No. 1-143668).

[0004]

However, in the conventional aluminum honeycomb panel described in this publication, when grooves are provided on the surface of the reinforcing material, the brazing material fills the grooves, resulting in an insufficient amount of the brazing material. There is a problem that.

The present invention has been made in view of the above problems, and has as its object to provide a method for manufacturing an aluminum honeycomb panel which can braze and join a reinforcing member and a face plate with high strength.

[0006]

The method for manufacturing an aluminum honeycomb panel according to the present invention comprises disposing a pair of aluminum face plates with an aluminum honeycomb core and an aluminum reinforcing material interposed therebetween. In the method for manufacturing an aluminum honeycomb panel assembled by brazing, a surface of the joint between the reinforcing member and the face plate is subjected to a surface polishing treatment so that a surface roughness Rz becomes 2 μm or less, and then the honeycomb member is joined to the honeycomb core and the reinforcing member. The pair of face plates, which are preliminarily clad with a brazing material, are disposed on both sides of the honeycomb core and the reinforcing material, and the honeycomb core and the reinforcing material and the face plate are integrally brazed. I do.

[0007]

According to the present invention, the brazing property between the reinforcing material and the face plate is stabilized after vacuum brazing by regulating the surface roughness of the reinforcing material to Rz = 2 μm or less before brazing,
An excellent brazing joint having a brazing area ratio of 90% or more represented by the following formula can be reliably obtained.

[0008]

## EQU1 ## Brazing area ratio = Brazed joint area / Contact area between reinforcing material and face plate

That is, by polishing the surface so as to regulate the surface roughness of the reinforcing material to Rz: 2 μm or less, at the time of vacuum brazing, the brazing material sufficiently fills the unevenness remaining on the surface of the reinforcing material. The performance is improved. Conversely, the greater the surface roughness of the reinforcing material, the lower the brazing properties due to the lack of the absolute amount of brazing material.

In addition, by polishing the surface so that the surface roughness of the reinforcing material is kept at Rz = 2 μm or less, the surface oxide film which is the greatest cause of impairing the wettability of the brazing material can be removed to some extent. Sometimes, the thin oxide film remaining on the surface of the reinforcing material is easily broken, and good brazing properties can be secured.

Further, by polishing the surface of the reinforcing material,
It is also easy to remove dirt such as oil adhered to the surface of the reinforcing material, which also becomes a factor for improving brazing properties.

[0012]

Next, examples of the present invention will be described in comparison with comparative examples. FIG. 1 shows a perspective view of a honeycomb panel 10. As shown in FIG. 1, an outer frame la was manufactured by using an extruded aluminum material of 6N01 alloy as the reinforcing material 1, combining a plurality of reinforcing materials 1, and temporarily fixing each corner portion by TIG welding or the like. . And the outer frame 1a
A plurality of rows of honeycomb cores 2 made of a 6951 alloy clad with a 4004 brazing filler metal are arranged inside and outside the outer frame 1a.
Honeycomb panel 10 was manufactured by arranging face plates 3 and 4 made of a 6951 alloy in which a 004 brazing material was clad on one side and brazing integrally by vacuum heating.

In the present embodiment, the surface of the reinforcing material 1 (or the outer frame la) was polished as a pre-brazing treatment, and the surface roughness of the reinforcing material 1 was reduced to Rz: 2 μm or less. The surface polishing includes buff polishing, barrel polishing, diamond polishing and the like, and these polishing means are performed manually or automatically. In this case, alumina, tripoly, Mathires, silicon oxide, calcium oxide, diamond, or the like is used as the abrasive. Further, by machining the surface of the reinforcing member 1 (or the outer frame la), the surface roughness is reduced to Rz = 2 μm.
It can also be:

The brazing conditions of this embodiment are as follows:
580 ° C., heating time: 8 hours, degree of vacuum: 8 × 10 ⁻⁵ To
rr.

A method of measuring the surface roughness of the joint surface of the reinforcing material is based on a 10-point average roughness (R) specified in JIS B0601.
z) was employed. This measurement site is arbitrary.

The brazing condition between the reinforcing material and the face plate after brazing was inspected by ultrasonic flaw detection. The results are shown in Table 1 below together with the brazing results of the comparative example in which the pre-brazing treatment for the reinforcing material was omitted and the comparative example in which another treatment was performed. In the case of the embodiment in which the reinforcing material was polished, the brazing condition (determined by the brazing area ratio) was always 90% or more. it is obvious.

[0017]

[Table 1]

[0018]

As described above, according to the present invention, the surface of the joint between the reinforcing member and the face plate is polished so that the surface roughness Rz is 2 μm or less. Is reliably 90% or more, and an extremely high bonding strength can be obtained.

[Brief description of the drawings]

FIG. 1 shows a perspective view of a honeycomb panel.

[Explanation of symbols]

 1: reinforcement material la: outer frame 2: honeycomb core 3: upper surface plate 4: lower surface plate 10: honeycomb panel

Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI // B23K 101: 02 (72) Inventor Toshihiko Sasaki 14-1, Nagafuminatocho, Shimonoseki City, Yamaguchi Prefecture Kobe Steel, Ltd. Chofu Works (72) Inventor Haruo Kato 14-1, Chofu Minatomachi, Shimonoseki City, Yamaguchi Prefecture Inside the Kofu Steel Works Chofu Factory (72) Inventor Isamu Ueki 14-1, Nagafu Minatomachi, Shimonoseki City, Yamaguchi Prefecture Inside the Kofu Steel Works Chofu Works ( 56) References JP-A-7-300685 (JP, A) JP-A-1-143668 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B23K 1/00 330 B21D 47 / 00 B23K 1/20 B32B 3/12

Claims (1)

(57) [Claims] In a method for manufacturing an aluminum honeycomb panel, a pair of aluminum face plates is arranged with an aluminum honeycomb core and an aluminum reinforcing material interposed therebetween, and these are assembled by brazing. The surface to be joined with the face plate has a surface roughness Rz of 2 μm.
m, and the pair of face plates, which are previously clad with a brazing material on the side to be joined with the honeycomb core and the reinforcing material, are arranged with the honeycomb core and the reinforcing material interposed therebetween. A method of manufacturing an aluminum honeycomb panel, comprising brazing the honeycomb core and the reinforcing member and the face plate integrally.