Integral forming technology for hollow multi-cavity special-shaped surface composite material complex structural member

Abstract

The invention provides an integral forming technology for a hollow multi-cavity special-shaped surface composite material complex structural member. The technology includes the steps that low-melting-point alloy is subjected to low-pressure casting, and a fusibility mold core is obtained to serve as a mandrel; the prepreg or fabric is laid on the outer surface of the mandrel of the fusibility mold core to be made into a prefabricated part; and after the mandrel with the prefabricated part and an outer mold body of a workpiece mold are subjected to die assembly solidification, a composite material grating workpiece with the fusibility low-melting-point alloy mandrel is placed into a drying box, and accordingly a qualified composite material grating is obtained after fusion. The integral forming technology for the hollow multi-cavity special-shaped surface composite material complex structural member solves the integral forming problem of the hollow multi-cavity composite material complex structural member with the complex inner contour and curvature, the low-melting-point alloy is used for preparing the mandrel, the cost is much lower than that of a metal mandrel, the manufacturing cycle is short, efficiency can be improved, the processing difficulty and technique implementation difficulty are low, and demolding can be performed easily.

Description

technical field [0001] The invention relates to an overall molding process of complex structural parts of hollow multi-cavity special-shaped surface composite materials. Background technique [0002] Hollow multi-cavity special-shaped complex structural parts of composite materials are a typical structure in the fields of aviation, aerospace and engines, such as wing beams, flat tails, central wing boxes, engine grilles, air intakes and other complex parts, the structures of which are Hollow multi-cavity structure, this type of composite material parts usually has the characteristics of difficult demoulding, or very high requirements on the inner surface. The traditional metal mandrel used in compression molding process, autoclave forming process and RTM forming process, etc., after the composite material part is cured, it is difficult to get out of the composite material part, or the metal mandrel is out of the composite material part. Difficult to come out, there is some ...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a hollow multi-cavity special-shaped surface composite material complex structure overall molding process, the use of fusible low-melting point alloy material to prepare the mandrel, reduce the difficulty of demoulding, obtain the mirror surface obtained by the metal mold, meet the pneumatic To solve the problem of difficult demoulding during the molding process of complex structural parts of hollow multi-cavity special-shaped surface composite materials in the prior art, and it is difficult to obtain the aerodynamic surface required by aerodynamics

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