JPH11254067A - Manufacture of curved surface shape honeycomb panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture the complex three-dimensional shape curved surface honeycomb panel. SOLUTION: When forming the curved surface shape, the honeycomb panel 9 manufactured by joining partially a honeycomb core material and back surface sheet material and front surface sheet material interposing the honeycomb core material in the state of a flat plate as primary working, is subjected to press working to the prescribed curved surface shape and the three-dimensional shape. After that, by arranging the honeycomb panel 9 after the press working in dies in the shape of a product shape as secondary working, the honeycomb core material is subjected to a plastic deformation by hydraulic bulging.

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 a curved honeycomb panel.

[0002]

2. Description of the Related Art Conventionally, when a sandwich panel 11 having a curved shape, such as a curved honeycomb panel, is manufactured, as shown in FIG. A roll bender is used that performs bending by being inserted between a central pressure roller 12 and left and right support rollers 13 and 14.

[0003]

However, according to such a conventional method, a sandwich panel having a two-dimensional curved surface can be manufactured, but a sandwich panel having a three-dimensional curved surface cannot be manufactured. In addition, in the conventional method, since the sandwich panel in which the core material and the surface material are firmly fixed is bent, the bendable range is limited, and when the bending is performed beyond the bending limit. However, there is a problem that the sandwich panel cannot be bent beyond this limit because the panel strength is reduced. Further, according to the conventional method, it is possible to process the sandwich panel into a panel having a constant curvature or a curved surface with a relatively small change in curvature within the bending limit, but it is manufactured as a panel having a slightly complicated change in curvature. This is difficult, and a method capable of manufacturing a honeycomb panel having a complicated shape has been desired. An object of the present invention is to provide a curved honeycomb panel with the following features.
As the next processing, a laminated material obtained by partially joining a honeycomb core material and two face plate materials sandwiching the honeycomb core material in a flat state is subjected to press working into a predetermined curved surface shape and a three-dimensional shape, and then press working as secondary processing. To provide a method for manufacturing a curved honeycomb panel having a complicated three-dimensional shape by placing the laminated material in a mold having a product shape and plastically deforming the honeycomb core material by hydraulic bulging. is there.

[0004]

According to the method for manufacturing a curved honeycomb panel according to the first aspect of the present invention, a curved shape is formed in the manufacture of a honeycomb panel including a honeycomb core material and two face plate materials sandwiching the honeycomb core material. In the meantime, as a primary processing, a laminated material in which a honeycomb core material and two face plate materials sandwiching the honeycomb core material are partially joined in a flat state is subjected to press working into a predetermined curved surface shape and a three-dimensional shape, and thereafter,
As a next process, a laminated material that has been pressed is arranged in a mold having a product shape, and the honeycomb core material is plastically deformed by hydraulic bulging. In the method for manufacturing a curved honeycomb panel according to claim 2 of the present invention, a laminated material obtained by partially joining a honeycomb core material and two face plate materials sandwiching the honeycomb core material in a flat state has a predetermined curved shape and three-dimensional shape. When pressing, the die and punch are made into a product shape, press processing is performed so that the laminated material is plastically deformed, and after the press processing is completed, the punch is pulled up to the product shape and fixed, so that the water pressure does not decrease The honeycomb panel is processed in a series of processing steps by applying a hydraulic pressure for plastically deforming the honeycomb core material in a hydraulic bulge processing die arranged in the honeycomb panel.
In the method for manufacturing a curved honeycomb panel according to the third aspect of the present invention, a laser beam is used for joining the honeycomb core material and the face plate material. In the method for manufacturing a curved honeycomb panel according to claim 4 of the present invention,
In a state where the honeycomb core material and the two face plate materials sandwiching it are flat, the upper face plate material is laser-welded at a constant interval of width a to join the upper face sheet material and the honeycomb core material, and the lower face sheet material is upper. The lower surface material is laser-welded on a perpendicular line of the upper surface material through a point which is a half of the distance a of the surface material, and the panel formed by joining the lower surface material and the honeycomb core material is expanded, so that the final shape is triangular. It is configured to be a honeycomb panel having a shaped core. In the method for manufacturing a curved honeycomb panel according to claim 5 of the present invention, the value obtained by multiplying the yield strength of the honeycomb core material by the plate thickness is:
The structure is smaller than the value obtained by multiplying the yield strength of the face plate material by the plate thickness.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, in order to clarify the effects of the present invention, the embodiments will be described in more detail.
The present invention is not limited to these. FIG. 1 shows the configuration of the embodiment. 200mm width, 200mm length,
A honeycomb core material 1 made of a 270 MPa class low carbon steel plate having a width of 160 mm, a length of 200 mm, and a plate thickness of 1.2 mm is formed on a lower plate material 2 made of a 270 MPa class low carbon steel plate having a thickness of 2.0 mm. aligning the ends a ₁ and the end portion a ₂ of the honeycomb core material 1, the ends b ₂ ends b ₁ and the honeycomb core material 1 of the lower face plate material 2, respectively, lower surface plate material 2
The honeycomb core material 1 is overlapped so that the end e of the honeycomb core material 1 is arranged at a position 20 mm from the end c of the honeycomb core material 1, and the ends c and d of the honeycomb core material 1 and the space between them are spaced a = 40 mm. Laser beam 3 parallel to ends c and d
Accordingly, a carbon dioxide laser having an output of 4.0 kW from the end portions a ₁ and a ₂ to the end portions b ₁ and b ₂ of the lower plate material 2 and the honeycomb core material 1 (shield: Ar gas 151 / min,
2. Welding speed using the processing point beam diameter: φ0.5 mm).
Welding was performed at 0 m / min. 4 is a welding bead. After that, width 200mm, length 200mm, plate thickness 2.0mm
The top plate 5 made of a 270 MPa class low carbon steel sheet is overlapped, and the end g of the top plate 5 and the end e of the bottom plate 2, the end h of the top plate 5, and the end of the bottom plate 2 f, and the upper plate material 5 and the honeycomb core material 1 are passed through a half point of the already welded joint line.
Was welded to the lower surface plate material 2 by laser welding.

After that, in order to perform press working to a desired curved surface shape, the laminated material 9 is plastically deformed by a forming die 8 and a forming die 7 having a product shape as shown in FIG. Pressing is performed until the occurrence of, and after the pressing is completed, the forming die 8 and the forming punch 7 are used as a final product shape die. end a _1, a of the laminated material 9 so that the liquid pressure does not decrease
_2, a ₃ and b _1, b _2, b ₃ and a _1, a _2, a ₃ side of the honeycomb core material in a mold part i for hydraulic bulging disposed in close contact with the exception of In order to plastically deform ₁ , a liquid pressure of about 1000 atm is applied between the upper plate material 5 and the lower plate material 2 from a part i on the side a ₁ , a ₂ , a ₃ side of the laminated material 9 to expand. As a result, a curved honeycomb panel 10 having a desired height and a panel height of 15 mm perpendicular to the curved surface tangential direction was obtained. Since the curved surface forming is performed before the curved honeycomb panel 10 has the high rigidity peculiar to the honeycomb panel, the curved surface processing of a complicated shape can be performed, and the production of the curved surface honeycomb panel 10 of a complicated shape can be realized.

Although the peak width of the core, that is, the welding interval a largely depends on the compressive strength of the panel and the formability of the panel, the panel shape in this case has good compressive strength and formability.

Further, as shown in FIG. 3, in the manufacturing method of the present invention, the face plate material (lower plate material 2) and the honeycomb core material 1 are joined in a flat state, so that the joint (weld bead 4) is formed. The mating surfaces could always be adjusted with sufficient accuracy, and the joint did not fall below the base metal strength.

[0009]

According to the method for manufacturing a curved honeycomb panel according to the first aspect of the present invention, even if the panel has a complicated curved surface in which a plurality of curved surfaces are continuous or a panel having a three-dimensional curved surface, the product shape can be reduced. By changing the shape of the molded mold, it can be manufactured easily and with high precision, and since the honeycomb core material is joined to the face plate material in a flat state, the joining of the honeycomb core material and the face plate material It is possible to easily obtain the alignment accuracy of the parts, and as a result, it is possible to obtain a curved honeycomb panel having a high-quality joint. According to the method for manufacturing a curved honeycomb panel according to claim 2 of the present invention, the mold is formed by combining a press working mold for temporary forming of the panel and a hydraulic bulge mold for determining a final shape. The number and the number of panel movement steps can be reduced, and productivity can be improved.
According to the method for manufacturing a curved honeycomb panel according to claim 3 of the present invention, since a laser beam is used for bonding, the bonding can be performed while minimizing the thermal strain applied to the honeycomb core material and the face plate material, An excellent effect is obtained in that a curved honeycomb panel excellent in both strength and surface smoothness can be manufactured. According to the method for manufacturing a curved honeycomb panel according to claim 4 of the present invention, since the honeycomb core material is bonded to the face plate material in a flat state,
The state in which the honeycomb core material and the face plate material do not contact each other can be avoided, and the joining accuracy of the joint can be easily obtained. In addition, by changing the welding interval a for laser welding, a triangular core having desired performance in accordance with the target performance can be easily processed without going through complicated processing steps, thereby improving productivity. Brings an excellent effect that can be performed. According to the method for manufacturing a curved honeycomb panel according to claim 5 of the present invention, the value obtained by multiplying the yield strength of the honeycomb core material by the plate thickness is smaller than the value obtained by multiplying the yield strength of the face plate material by the plate thickness. Accordingly, an excellent effect of minimizing plastic deformation of the face plate material, facilitating core forming, and producing a curved honeycomb panel having excellent surface smoothness is provided.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a process of manufacturing a laminated material in a method of manufacturing a curved honeycomb panel according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a process of press working in the method for manufacturing a curved honeycomb panel of the embodiment.

FIG. 3 is an enlarged view of a joined portion of the curved honeycomb panel of the embodiment.

FIG. 4 is a diagram illustrating a method for manufacturing a conventional curved honeycomb panel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Honeycomb core material 2 Lower surface plate material 3 Laser beam 4 Welding bead 5 Upper surface plate material 6 Hydraulic injection port 7 Molding die punch 8 Molding die 9 Lamination material 10 Curved honeycomb panel 11 Sandwich panel 12 Pressure roller 13 Supporting roller 14 Support roller

Claims (5)

[Claims] In manufacturing a honeycomb panel comprising a honeycomb core material and two face plate materials sandwiching the honeycomb core material, a honeycomb core material and two face plate materials sandwiching the honeycomb core material are formed as primary processing in forming a curved surface shape. The laminated material partially joined in the state of a flat plate is pressed into a predetermined curved surface shape and a three-dimensional shape, and then the laminated material pressed as a secondary process is placed in a mold having a product shape. A method for manufacturing a curved honeycomb panel, wherein a honeycomb core material is plastically deformed by hydraulic bulging. 2. A die and a punch are formed when a laminated material obtained by partially joining a honeycomb core material and two face plate materials sandwiching the honeycomb core material in a flat state into a predetermined curved surface shape and three-dimensional shape is formed. Pressing is performed so that the laminated material is plastically deformed into the product shape, and after the pressing is completed, the punch is pulled up and fixed so as to have the product shape, and a metal for hydraulic bulging arranged so that the water pressure does not decrease. 2. The method for manufacturing a curved honeycomb panel according to claim 1, wherein the honeycomb panel is processed in a series of processing steps by applying a hydraulic pressure for plastically deforming the honeycomb core material in the mold. 3. The method for manufacturing a curved honeycomb panel according to claim 1, wherein a laser beam is used for joining the honeycomb core material and the face plate material. 4. The upper plate material and the honeycomb core material are joined by laser welding the upper plate material at a constant interval of width a in a state where the honeycomb core material and two face plate materials sandwiching the honeycomb core material are flat, The lower plate material is equal to the distance a of the upper plate material.
The honeycomb panel having a triangular core in the final shape by laser welding the lower plate material onto the perpendicular line of the upper plate material through the point of / 2 and expanding the panel in which the lower plate material and the honeycomb core material are joined. The method for manufacturing a curved honeycomb panel according to claim 1, wherein: 5. The production of a curved honeycomb panel according to claim 1, wherein a value obtained by multiplying the yield strength of the honeycomb core material by the sheet thickness is smaller than a value obtained by multiplying the yield strength of the face plate material by the sheet thickness. Method.