Manufacturing process of VARI composite material foam sandwiched wedge-shaped part and obtained wedge-shaped part

Abstract

The invention provides a manufacturing process of a VARI composite material foam sandwiched wedge-shaped part and the obtained wedge-shaped part. The surface of a forming mold is paved with demolding cloth I and then is paved with lower skin, wedge-shaped sandwiching foam is positioned to the lower skin and is paved with upper skin; then, demolding cloth II, a diversion medium, a rubber injection pipeline, an exhausting pipeline and a vacuum bag film are sequentially paved, the vacuum bag film is firmly bonded with a sealing rubber strip, packaging and vacuumizing are performed to complete the processes of vacuum detection, resin preheating, mold preheating, resin injection, closing of the rubber injection pipeline, heating and curing and demolding. A resin hole path penetrating the wedge-shaped sandwiching foam is formed in the wedge-shaped sandwiching foam to accelerate rapid infiltration of fibers in the lower skin under the wedge-shaped sandwiching foam. Compared with traditional VARI, the problems of a VARI foam sandwiched structure part are solved, and meanwhile the defects of the edge effect of wedge-shaped foam part VARI, needle holes formed in the surface of the part, rubber lack and the like are overcome through reasonable flow pass arrangement.

Description

technical field [0001] The invention relates to a manufacturing process of a foam interlayer wedge-shaped product of VARI molding composite material and the obtained wedge-shaped product. Background technique [0002] Civil aircraft is an important branch in the aviation field, and the application of composite materials on it has attracted much attention. The application of composite materials in civil aircraft has gradually increased. The amount of composite materials used in Boeing's B787 aircraft and Airbus' A350 aircraft has exceeded 50%. With the increasing application of composite materials, cost will inevitably become the main factor limiting the application of composite materials in civil aircraft. According to the structural characteristics of each component of civil aircraft, introducing low-cost molding processes, such as VARI molding process, RTM molding process, OOA molding process, etc., is an effective means to reduce aircraft manufacturing costs. Among the v...

AI Technical Summary

Problems solved by technology

With the conventional VARI molding process, the resin cannot quickly reach the fabric on the bottom of the foam, and can only penetrate through the capillary action between the fabrics, which will easily cause the fabric at the bottom of the foam to not be fully infiltrated and the bonding effect between the foam and the skin to be poor. As a result, the quality of the product is unqualified; in addition, the edge effect of the wedge-shaped part is very obvious. During the resin penetration process, an encircled area is easily formed in the foam bottom skin, resulting in dry spots on the surface of the product, lack of glue and other defects.

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