RU2250830C2 - Design of a cellular panel - Google Patents

Abstract

FIELD: aircraft industry; production of different partitions used for airplane cabins inner lining.

SUBSTANCE: the invention is dealt with aircraft industry, in particular, with production of different partitions used for airplane cabins inner lining. The cellular panel represents a material with the layers of the upper and lower layers of lining and the filler. The upper and bottom layers of lining are made out of material named Organit 7ТЛ-Б(0)-2-Ш. The filler is manufactures out of a high heat-resistant paper Phenylon БФСК, between them there is an adhesive film ВК-46. The butts of the cellular panel are filled with a paste ВПЗ-1-55 to prevent penetration of moisture into the filler. The given design of the cellular panel ensures an increase of a pressure density of the panel and a number of points to fix the fittings and the fastening elements on the panel perimeter.

EFFECT: the design of the cellular panel ensures an increase of a pressure density of the panel and a number of points to fix the fittings and the fastening elements.

2 dwg, 2 tbl

Description

The invention relates to the aviation industry and is used for the manufacture of various partitions used for sheathing aircraft cabins.

Known honeycomb panel, which is a three-layer material with bearing layers of the upper and lower sheathing and filler, while the skin layers are made of organoplastic material, which is a pressed sheet material made of thermosetting binders, the skin layers and the filler are glued together with VK-51 adhesive film (RU 2029037 C1, 02.20.1995).

The disadvantage of this honeycomb panel is that it does not have moisture protection in the aggregate.

The technical result achieved by the implementation of this invention is to provide protection against moisture ingress inside the structure, to increase the density of the panel for compression and the mounting points of the fittings and fasteners around the perimeter of the panel.

The specified technical result is achieved by the fact that in the honeycomb panel, which is a material with upper and lower skin layers and a filler, according to the invention, the upper and lower skin layers are made of Organit 7TL-B0-2-Sh material, the filler is made of high-strength paper Fenilon BFSK , between them a VK-46 adhesive film was laid, and the ends of the panels are filled with VPZ-1-55 paste to prevent moisture from entering the filler.

The invention is illustrated by drawings, where in Fig.1 shows a honeycomb panel; figure 2 is a section aa in figure 1.

The lower layer of lining 1 of Organite 7ТЛ-Б0-2-Ш ТУ 6-19-259-86, which is a sheet layered pressed material made of impregnated fabrics based on CBM fiber, is laid on a vacuum mold.

On the upper surface of the casing 1, a size 5 adhesive film is laid. VK-46 films TU 6-41-1499-89 are intended for gluing non-perforated metal and non-metallic honeycomb structures, as well as for gluing metals and non-metals working in certain temperature ranges. These films comply with the requirements of these specifications and are manufactured according to the technological regulations approved in the prescribed manner.

Table 1 shows the standards that VK-46 films must comply with.

Table 1 Name of indicator Brand Standards VK-46 VK-46A 1. Appearance yellow color 2. Shear strength (kgf / cm ² , not less) at a temperature of 20 ° C 290 at a temperature of 80 ° C 190 3. Strength adhesive connections when the honeycomb core with the skin is torn off (kgf / cm ² , not less) at a temperature of 80 ° С 35 4. The fluidity at release, mm not less than 25 5. Mass fraction of glue,% AZ (C) from 80 to 95 T-10-80 from 30 to 60 Z3-200 from 50 to 70 6. Mass fraction of volatile substances,%, no more 2

Strictly around the perimeter of the adhesive film 5, filler 2 is laid out - sotoplast PPS-2.5-45 TU 1-596-103-82 with a hexagonal cell shape made of high-temperature-resistant paper Phenylone BFSK TU 13-04-598-81 or imported Nomex paper ( type 410 or 412), with a honeycomb height of 5 mm.

Table 2 shows the conditions that apply to high-strength paper Fenilon BFSK for honeycomb fillers of multilayer structures.

Table 2 The name of indicators Norms Test methods 1. Thickness, mm 0.05 ± 0.01 GOST 13199-67 2. The mass of paper, an area of 1 m ² , g 48 ± 4 GOST 13199-67 3. Destructive force, kgf, not less GOST 19525.1-79 a) in the machine direction 3 b) in the transverse direction 2 4. Relative elongation,%, not less than: GOST 13525.1-79 a) in the machine direction 4,5 b) in the transverse direction 4.0 5. Break resistance, not less 4500 GOST 13525.2-68 6. Humidity 3 _-2 ⁺¹ GOST 13525.19-71

An adhesive film 5 VK-46 is laid on the upper surface of the honeycomb 2 and is closed by the upper layer of the casing 3 of Organite. Along the perimeter of the honeycomb panel, metal plates are laid with a height equal to the height of the honeycomb panel.

A drainage layer is installed on top of the assembled bag and closed with a vacuum bag. The mold is installed in an oven, connected to a vacuum line and, according to a predetermined mode, the adhesive film is cured. A vacuum is created in the range of 0.4-0.5 kg / cm ² , the temperature is set to 125 ± 5 ° C and maintained for 4 hours. After that, the temperature in the furnace is lowered to 30 ° C, the vacuum equipment is disassembled and the honeycomb panel is removed.

After that, using a spatula around the perimeter and into the holes of various configurations, the honeycomb panel is filled with paste VPZ-1-55 (position 4 in the drawings), made on the basis of resin ED-20 GOST 10587-93. The viability of the paste is 30-40 minutes at a temperature of 20-25 ° C. The ends of the panel are fixed with a sticky tape.

Pasta VPZ-1-55 has the following composition:

resin ED-20 GOST 10587-93 - 75 parts by weight

Fostetrol-1 TU 6-02-1022-80 - 15 parts by weight

hardener (polyethylene polyamine - PEPA) - 8-10 parts by weight

microspheres MS-A9 - 50-55% by weight

composition

TU 6-48-108-94

Application of the VPZ-1 paste to the ends of the honeycomb panel and to all openings of the structure increases the stiffness of the honeycomb panel at the points of fastening of the fittings, devices and fasteners of the panel itself in the cabin, and also prevents moisture from entering the honeycomb.

Fostetrol-1 or tetraalkylphosphonate pentaerythritol hydroxyethylated is a viscous liquid from light brown to dark brown. Structural formula:

, где n=1,5-2

where n = 1.5-2

The microspheres Ms-A9 of group A TU-6-48-108-94 are used as a lightweight filler for the production of composite materials and are a light free-flowing white powder produced from sodium borosilicate glass and consisting of individual hollow particles of a spherical shape with a size within 15- 200 microns, mainly from 15 to 125 microns.

An important factor is the density of the material obtained after the formation of the panel, which should not exceed ρ = 0.5 g / cm ³ . The actual density of the material for the claimed panel with a height of 5.6 mm (see drawings) is ρ = 0.397 g / cm ³ , which indicates that the proposed panel is much lighter. The compressive stress of the material of the proposed design is σ = 40 kg / cm ² .

Claims (1)

Honeycomb panel, which is a material with upper and lower skin layers and filler, characterized in that the upper and lower skin layers are made of Organite 7-TL-B (0) -2-Ш material, the filler is made of high-temperature-resistant paper Fenilon BFSK, between they laid VK-46 adhesive film, and the ends of the panel are filled with VPZ-1-55 paste to prevent moisture from entering the filler.

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