Multi-axial direction composite material bent pipe and preparation method thereof

Abstract

The invention provides a multi-axial direction composite material bent pipe and a preparation method thereof. The multi-axial direction composite material bent pipe is integrally formed by using a soluble core mold and using a heat expansion pressure process; the soluble core mold is heated to be molten through soluble bonding agents in the core mold resin mixture; after the cooling shaping, a solid-state core mold is obtained; the core mold resin mixture comprises quartz sand, soluble bonding agents and short cut fiber. The process characteristics of the soluble core mold and a heat expansionpressurization method are combined; the problem of demolding and peripheral pressurization difficult point problem in the bent pipe structure shaping of the special-shaped composite material is solved; the whole preparation of the special-shaped bent pipe is realized.

Description

technical field [0001] The invention relates to a multiaxial composite material elbow and a preparation method thereof, belonging to the technical field of composite material preparation technology. Background technique [0002] Composite material elbows have become a popular choice in the fields of aerospace, marine development, oil extraction and smelting, building water supply and drainage, and chemical industry due to their excellent performance in light weight, high strength, corrosion resistance, fatigue resistance, pressure resistance and creep resistance, and long service life. Products that are urgently needed in industries such as aerospace, especially in the structure of aerospace high-precision aircraft, have great significance in reducing weight and increasing range, and improving technical and tactical performance. [0003] However, composite elbows are typical non-axisymmetric parts, which are fundamentally different from conventional molding methods such as m...

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Problems solved by technology

[0003] However, composite elbows are typical non-axisymmetric parts, which are fundamentally different from conventional molding methods such as molding, pultrusion, coiling, injection molding, and winding of simple axisymmetric bodies such as straight pipes, cones, and pressure vessels. It has many series of specifications, complicated shape and structure, and is very difficult to prepare.

At present, for this kind of special-shaped composite material elbow, the production process is mainly hand lay-up, and the soluble mandrel of gypsum is often used. However, due to the lack of molding pressure, the appearance of the pipe fittings is rough, the strength is low, the performance is large, and the quality is difficult to guarantee.

For more complex aircraft and various piping systems in petrochemical industry, such as air intake, exhaust, circulation, etc., the structural shapes are different, and its typical structure is a multi-axial special-shaped elbow, such as figure 1 As shown, due to the particularity of the structure, there are problems such as demoulding and circumferential pressure in the molding of special-shaped composite elbow structures, which cannot be prepared by conventional methods.

[0004] CN201310040115.9 provides a soluble mandrel using polyvinyl alcohol, quartz sand and water. Since the water is used to prepare the adhesive in the manufacture of the mandrel, the mandrel needs to be dried for a long time, and the production cycle and cost are high. The strength is also low, not enough to support the pressure required to form high-performance composite components

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