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

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.

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 ...

AI Technical Summary

Problems solved by technology

[0006] In view of my country's high-speed train industry's requirements for the integrated molding and performance of ultra-hybrid panel / 3D braided hollow sandwich composite materials in the high-speed train industry, the fiber metal laminate is used as the panel, and the 3D braided hollow prefabricated body is used as the core material, combined with hot pressing Technology, vacuum infusion process and air pressure forming process are integrated to form a super hybrid panel / three-dimensional woven hollow sandwich composite material, which can effectively solve the problems of incomplete standing and non-uniform standing height of the three-dimensional woven hollow prefabricated body, and can be efficient and low Realization of cost-integrated molding of flat parts and curvature parts of ultra-hybrid panels / three-dimensional braided hollow sandwich composites

Images