JPH0531589A - Honeycomb panel and manufacture thereof - Google Patents

Abstract

PURPOSE:To obtain a honeycomb excellent in heat resistance and rigid with flanges by laying a face sheet on top of the flange part of honeycomb core from the side of the face sheet by means of an energy beam and welding. CONSTITUTION:This honeycomb panel is formed by welding with the energy beam EB for joining the honeycomb 2, which has flange parts 30-33, and the face sheets 3, 4. Consequently, since no adhesives are used, the honeycomb can be used in a state of high temperature, and also, through the increase of a contact area between the honeycomb core 2 and the face sheets 3, 4 by adding the flanges, the rigid honeycomb panel is obtained.

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 metal foil such as stainless steel or titanium and a method for manufacturing the same. These panels consist of a honeycomb core sandwiched between a pair of face sheets. Usually, the core is formed of a plurality of corrugated strips, which are bonded together by gluing or other means to form a honeycomb structure. The facesheet is secured to the edges of the honeycomb core by gluing or other means. Such a structure
Very light and excellent in strength. This type of panel is commonly used in aircraft and ships.

[0002]

2. Description of the Related Art A face sheet is bonded to a honeycomb core by electric resistance welding or an adhesive. Regarding the electric resistance welding method, for example, JP-A-62-9434 is used.
No. 3 publication.

According to this, an electrode bar 90 having a pair of electrode strips 92, 94 extending as shown in FIG. 6 (A) is prepared, and a core strip 96 is provided with flange portions 30, 32 of the electrode strips. Place on the electrode strip so that it is exposed to the outside. Next, this electrode strip and the core strip attached thereto are placed between a pair of face sheets 98 and 100 to form a nest with the core strip 102 as shown in FIG. 6 (B). Then, an electric current is passed through the electrode wheel 104 to weld the core strip 96 to the face sheets 98 and 100.

Thereafter, the top of the core strip 96 is shown in FIG.
By the node welder 106 shown in (C), welding is performed on the valley portion of the core strip 102 already joined. In summary, first, the core sheet and the face sheet are joined, and then the cores are joined together. This is repeated to manufacture a honeycomb panel. There is also a method of joining a face sheet to a honeycomb core with an adhesive using a honeycomb core having no flange.

[0005]

DISCLOSURE OF THE INVENTION As mentioned above,
The conventional joining of the honeycomb core and the face sheet by the electric resistance welding method involves welding the cores one by one to the face sheet, which is very troublesome.
Furthermore, since the face sheet and the honeycomb core flange are sandwiched between the electrode wheel and the electrode bar to perform electric resistance welding,
Deformation easily occurs in the welded portion, causing undulations on the face sheet surface. Further, when the face sheet and the honeycomb core are joined by an adhesive instead of welding, the face sheet does not swell, but there is a drawback in that the heat resistance is inferior to the joining method by welding. The present invention is to manufacture a honeycomb panel by welding using an energy beam with high productivity, in which such a face sheet is free from undulation and which has excellent heat resistance.

[0006]

According to the present invention, a honeycomb core is formed by joining a flange-added honeycomb core and a face sheet by energy beam welding, and is excellent in heat resistance, productivity, and strength. The present invention relates to a panel, the gist of which is, in a honeycomb panel formed of a honeycomb core having a face sheet and a flange, by welding the face sheet to the flange portion from the side of the face sheet by an energy beam. A honeycomb panel and a method for manufacturing the same, which are manufactured by bonding to a honeycomb core.

Further, in a honeycomb panel comprising a honeycomb core having a face sheet and a flange, one face sheet is joined to the honeycomb core by lap welding from the face sheet side to the flange portion by an energy beam, The other face sheet and the honeycomb core are joined to each other by energizing the V-shaped narrow groove formed between the flange portion and the face sheet by moving an energy beam and moving the V-shaped groove portion for a while. A honeycomb panel and a method for manufacturing the same, which are manufactured by reflecting and condensing light in the deep part of the narrow groove and by welding the same with the flange portion by face sheet welding.

[0008]

The operation of the present invention will be described in detail below with reference to the accompanying drawings. The operation described below is intended to explain the present invention in principle, and of course has no meaning to limit the invention. The flanged honeycomb core used in the present invention has a flange serving as a welding margin with the face sheet on both surfaces thereof (FIG. 2). The honeycomb core is bonded in advance to a size required for manufacturing a honeycomb panel. As the method, any of conventional energy beam welding, electric resistance welding, and bonding with an adhesive may be selected. The honeycomb panel is formed by joining the flange portion of the honeycomb core to the face sheet to form a contact portion, and applying an energy beam from the face sheet side to the contact portion to overlap and weld the face sheet and the honeycomb core. Do (Figure 1). At this time, it is possible to select the conditions for inputting the energy beam or to perform heat removal in the vicinity of the welded portion in parallel to eliminate distortion in the welded portion and its periphery and generation of undulations in the face sheet.

Alternatively, one of the face sheets is joined to the honeycomb core by the method described above, and the other face sheet is formed with a V-shaped narrow groove between the flange portion of the honeycomb core and the face sheet. While moving the narrow groove part for a while, throw an energy beam into this narrow groove and multiple-reflect it to focus the energy beam at the back of the narrow groove.
Weld a face sheet to the flange of the honeycomb core,
A honeycomb panel is manufactured by bonding it to a honeycomb core (Fig. 3). According to this method, a honeycomb panel having no welding marks on one face sheet is manufactured.

Since the method of the present invention is to form a honeycomb panel by welding a honeycomb core to which a flange is added and a face sheet, unlike a honeycomb panel in which a core edge portion and a face sheet are joined by using an adhesive, It is characterized in that it does not break the joint below and has excellent heat resistance, and that it is stronger due to the increase in the joint area between the honeycomb core and the face sheet due to the addition of the flange.

Further, according to the present invention, the formation of the honeycomb core and the joining of the face sheet and the honeycomb core are performed in separate steps, and after the positioning is performed once when joining the two, the energy beam is applied. The face sheet and honeycomb core can be joined in a very short time by scanning at high speed toward the welded part or moving the face sheet and honeycomb core at high speed with respect to the energy beam. This is a significant improvement over the conventional method.

The honeycomb core according to the present invention may have any shape as long as it has a flange. Therefore,
The honeycomb core having a prismatic shape and the hexagonal prismatic shape described in the embodiments are not particularly limited. Further, the flange does not necessarily have to be present on each side of the cells of the honeycomb core.

As for the shape of the flange or the shape of the core strip, the location where the flange portion is present does not necessarily have to be two faces as shown in the above-mentioned example, and the presence surface of the flange portion and its shape can be selected. , I'm not particular about it. Therefore, depending on the application of the honeycomb panel, for example,
When used at high temperature, the material with excellent heat insulation effect is used to improve the heat resistance effect, the high temperature side surface is joined by the method of the present invention, and the core edge portion is formed without forming a flange as a joint portion for the surface. There is no problem even if the face sheet and the face sheet are joined with an adhesive.

[0014]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below are intended to explain the present invention in principle, and needless to say have no meaning to limit the invention. The core strip constituting the honeycomb core used in the examples is made of stainless steel and has a thickness of 100.
μm, so that the honeycomb core cell shape is an assembly of regular hexagonal prisms, one side is 4 mm, and the angle between adjacent sides is 6 mm.
It is a shape in which a 0-degree trapezoid is made continuous in succession. For the flange part, the sides parallel to the longitudinal direction of the core strip are alternately selected, and one side of the side is punched by press working on the side that intersects with that side, and the edge part is formed. On the other hand, it was bent vertically to be molded (FIG. 4). The core strips are combined so that the flanges present on the sides parallel to the longitudinal direction are back-to-back (FIG. 5 (A)), and the core strips are lap-welded by irradiation with a YAG laser to form a honeycomb core in advance. (FIG. 2 (A)). YAG at this time
The laser was focused by a lens having a focal length of 100 mm, and pulse energy of 500 mJ was irradiated at the focal position.

(1) For joining the above honeycomb core and face sheet, YAG, which is a typical energy beam, is used.
A laser was used. The face sheet is made of stainless steel and has a thickness of 300 μm. Face sheets were applied to both sides of the honeycomb core, the honeycomb core flange portion and the face sheet were brought into contact with each other, and the contact portion was irradiated with YAG laser from the face sheet side to bond the face sheet to the honeycomb core (FIG. 1). ). The YAG laser focused using a lens having a focal length of 100 mm, and the work piece had an irradiation energy of 900 mJ at the focal position.

(2) When the face sheet is joined to the honeycomb core, one face sheet is joined to the honeycomb core by the method of the above embodiment (1), and the other face sheet is joined to the flange portion of the honeycomb core and the face. A V-shaped narrow groove is formed between the seats, and YAG is formed in this narrow groove.
While the laser beam was introduced and the V-shaped groove portion was moved for a while, multiple reflection was performed and the YAG laser beam was focused on the inner part of the narrow groove to bond it to the honeycomb core to manufacture a honeycomb panel (Fig. 3). ).

(3) In the honeycomb panel of the above-mentioned Example (1), it was not possible to confirm welding distortion and waviness on the face sheet surface from the appearance test after welding. In addition, in the honeycomb panel of Example (2), it is not possible to confirm welding distortion and undulation on the face sheet surface from the appearance test after welding, and of course, the YAG laser beam was applied to the narrow groove. However, no welding marks were found on the face sheet on the side joined to the honeycomb core.

(4) As an evaluation of the mechanical characteristics of the honeycomb panel, a honeycomb panel having a side of about 75 mm was formed and subjected to a compression test. As a result, the maximum load resistance was about 6 tons, and peeling from the face sheet was observed. I could not admit. Further, as a heat resistance test, the sample was left to stand in an electric furnace at 1400 ° C. for about 15 minutes for gradual cooling, but similarly, no peeling between the core flange portion and the face sheet was observed. Therefore, it was confirmed from these tests that the honeycomb panel is stronger and has higher heat resistance than the honeycomb panel manufactured by the conventional manufacturing method.

The honeycomb cores described above can be formed by using the same core strips so that they do not come into contact with the flanges existing on the sides parallel to the longitudinal direction (FIG. 5 (B)). Also in this case, it is possible to form a honeycomb core having a feature that a flange exists on only one of the front surface and the back surface of the honeycomb core (FIG. 2).
(B)). Then, face sheets can be joined to such a honeycomb core by the same method.

Further, in the core strip used in this embodiment, the flanges are bent at opposite ends at the opposite sides,
This was done by considering that the number of joints between the face sheet and the honeycomb core is as uniform as possible in the honeycomb panel, that is, even strength, and the flanges are not necessarily bent at the opposite ends at the opposite sides. You don't have to. Since it is possible to have the flange on any side of the hexagon forming the honeycomb core by providing the flanges on both ends of the core strip and on the opposite sides as in the present embodiment, the honeycomb panel The strength can be improved.

[0021]

EFFECTS OF THE INVENTION By using an energy beam for joining a honeycomb core having a flange and a face sheet,
Compared with conventional bonding, it can be manufactured stably at a higher speed, it can be used even in high temperature conditions because it is not bonded by conventional adhesive, and by adding a flange, the contact area between the core and face sheet increases, It is possible to provide a strong honeycomb panel.

[Brief description of drawings]

FIG. 1 (A) is a conceptual view of joining a face sheet and a honeycomb core, FIG. 1 (B) is a conceptual view of joining face sheet and a honeycomb core seen from a cross section taken along line SS ′, and FIG. 2 (A) is a honeycomb. 2B is a schematic diagram of a core, FIG. 3 is a schematic diagram of a method of joining a honeycomb core and another face sheet, FIG. 4 is a schematic diagram of an example of a core strip, and FIG. 5 is a core strip and a honeycomb. Explanatory drawing of the example of a core, FIG. 6 is explanatory drawing of the example of the manufacturing method of the conventional honeycomb panel,
Is.

[Explanation of symbols]

1: Honeycomb panel, 2: Honeycomb core, 3: Face sheet, 4: Face sheet, 21-29: Honeycomb core strips, 30 to 33: flange part, 90: electrode bar, 92: electrode strip, 94: electrode strip, 96: core strip, 98: face sheet, 100: face sheet, 102: core strip, 104: electrode wheel, 106: node welder, EB: Energy beam.

Claims (4)

[Claims] 1. A honeycomb panel comprising a honeycomb core having a flange and a face sheet, which is produced by joining the face sheet to the flange portion by lap welding from the side of the face sheet with an energy beam. Honeycomb panel that features things. 2. A honeycomb panel comprising a honeycomb core having a flange and a face sheet, the face sheet being bonded to the honeycomb core by lap welding from the side of the face sheet to the flange portion with an energy beam to manufacture the honeycomb panel. A method for manufacturing a honeycomb panel characterized by the above. 3. A honeycomb panel comprising a honeycomb core having a flange and a face sheet, wherein one face sheet is joined to the honeycomb core by lap welding from the face sheet side to the flange portion with an energy beam, The other face sheet and the honeycomb core are joined to each other by energizing the V-shaped narrow groove formed between the flange portion and the face sheet by moving an energy beam and moving the V-shaped groove portion for a while. A honeycomb panel characterized by being manufactured by reflecting and condensing light in the back of a narrow groove and welding it to the flange portion by face sheet welding. 4. A honeycomb panel comprising a honeycomb core having a flange and a face sheet, wherein one face sheet is joined to the honeycomb core by lap welding from the face sheet side to the flange portion with an energy beam, The other face sheet and the honeycomb core are joined to each other by energizing the V-shaped narrow groove formed between the flange portion and the face sheet by moving an energy beam and moving the V-shaped groove portion for a while. A method for manufacturing a honeycomb panel, which is characterized in that the honeycomb panel is manufactured by reflecting and condensing the light in a deep part of the narrow groove, and by performing face sheet welding with the flange portion.