Integrated forming method of super-hybrid panel/three-dimensional woven hollow interlayer composite material

A technology of three-dimensional weaving and composite materials, which is applied in the field of preparation and molding of sandwich structures, can solve the problems of non-uniform standing height and incomplete standing of three-dimensional weaving hollow prefabricated fleece, and achieve the effect of high molding efficiency and low cost

CN113696509AActive Publication Date: 2021-11-26NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2021-11-26

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Abstract

The invention discloses an integrated forming method of a super-hybrid panel / three-dimensional woven hollow interlayer composite material. The method comprises the following steps: 1) carrying out surface treatment on an aluminum alloy sheet; (2) laying the aluminum alloy thin plate, continuous fiber prepreg, a hot melt adhesive film and a three-dimensional woven hollow prefabricated body layer by layer according to the design sequence; (3) impregnating the three-dimensional woven hollow prefabricated body through a resin vacuum flow guide process, releasing pressure, and lifting an upper mold of a mold for a certain distance; and 4) introducing hot air into a vacuum bag, closing a vacuum valve port after the three-dimensional woven hollow prefabricated body is bulged, and standing and curing. By combining a hot mold pressing process, a resin vacuum flow guide process and an air pressure forming process, the problems that pile warp of the three-dimensional woven hollow prefabricated body is incompletely stood and the standing height is not uniform are effectively solved. Integrated forming of a flat plate part and a curvature part of the super-hybrid panel / three-dimensional woven hollow interlayer composite material is achieved efficiently at low cost, and therefore the manufacturing requirement of a composite plate in the rail transit industry is met.
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Description

technical field

[0001] The invention relates to a preparation and molding method of a sandwich structure, which belongs to the field of preparation and molding of composite materials, and in particular relates to an integrated molding preparation method of a super-hybrid panel / three-dimensional braided hollow sandwich composite material. Background technique

[0002] With the continuous speed up of high-speed trains, higher requirements are put forward for the lightweight of the car body. Combined with the task of the 600 km / h high-speed maglev train and the 400 km / h variable gauge high-speed train being developed in my country, the application of new materials and its Structural optimization design is undoubtedly the most effective way to achieve lightweight.

[0003] The skin structure of the existing standardized EMU in my country (including the opening and closing mechanism, cockpit, equipment cabin floor, skirt board, etc.), the panel is mainly made of traditional metal ...

Examples

Embodiment 1

[0035] The cutting size of the first step is one piece of 1000mm×1200mm×15mm glass three-dimensional woven hollow prefabricated body, eight pieces of 1000mm×1200mm×0.15mm glass fiber reinforced epoxy prepreg, eight pieces of 1000mm×1200mm×0.03mm epoxy hot melt adhesive film .

[0036] The second step is to perform surface treatment on four 2024 aluminum alloy sheets with a size of 1000mm×1200mm×0.3mm, by sandblasting and 15 minutes of oxygen plasma surface treatment.

[0037] Step 3 Reference figure 1 , the materials are divided into 2024 aluminum alloy sheet 1, glass fiber prepreg 2, 2024 aluminum alloy sheet 1, glass fiber prepreg 2, glass three-dimensional woven hollow prefabricated body 4, glass fiber prepreg 2, 2024 aluminum alloy sheet 1 1. Glass fiber prepreg 2. 2024 aluminum alloy sheet 1, wherein the layers are bonded by epoxy hot melt adhesive film, and the glass fiber prepreg is cross-laminated.

[0038]The fourth step is to stick the double-sided bonded release c...

Embodiment 2

[0043] The first step is to cut out one piece of 800mm×1000mm×10mm carbon three-dimensional braided hollow prefabricated body, eight pieces of 800mm×1000mm×0.3mm carbon fiber reinforced polypropylene prepreg, and eight pieces of 800mm×1000mm×0.04mm polypropylene hot-melt adhesive film.

[0044] The second step is to carry out surface treatment on four 6061 aluminum alloy sheets with a size of 800mm×1000mm×0.5mm, by sandblasting and 15 minutes of oxygen plasma surface treatment.

[0045] The third step is to use the manipulator to press the material into 6061 aluminum alloy sheet, carbon fiber prepreg, 6061 aluminum alloy sheet, carbon fiber prepreg, carbon three-dimensional woven hollow prefabricated body, carbon fiber prepreg, 6061 aluminum alloy sheet, carbon fiber prepreg, 6061 aluminum alloy sheet, in which the layers are bonded with polypropylene hot-melt adhesive film, and the carbon fiber prepreg is cross-laminated.

[0046] The fourth step is to stick the double-sided ...

Embodiment 3

[0051] Step 1 The cutting size is 600mm×1100mm×15mm, one piece of basalt three-dimensional braided hollow prefabricated body, eight pieces of 600mm×1100mm×0.3mm basalt reinforced polyamide prepreg, and eight pieces of 600mm×1100mm×0.05mm polyamide hot-melt adhesive film.

[0052] The second step is to carry out surface treatment on four 7075 aluminum alloy sheets with a size of 600mm×1100mm×0.5mm, by sandblasting and 15 minutes of oxygen plasma surface treatment.

[0053] In the third step, the materials are divided into 7075 aluminum alloy sheet, basalt fiber prepreg, 7075 aluminum alloy sheet, basalt fiber prepreg, basalt three-dimensional braided hollow prefabricated body, basalt fiber prepreg, 7075 aluminum alloy sheet, basalt fiber prepreg Material, 7075 aluminum alloy sheet, in which polyamide hot-melt adhesive film is used to bond between layers, and basalt fiber prepreg is cross-laminated.

[0054] The fourth step is to stick the double-sided adhesive release cloth to ...