Die and method for molding composite material of semi-closed cavity gridding stressed-skin structure

Abstract

The invention relates to a die and method for molding a composite material of a semi-closed cavity gridding stressed-skin structure. The die comprises a core die bush (1), a male die body (2), an external female die body (3) and a lower-end pressing ring (4) having a supporting effect on the core die bush (1) and the external female die body (3); the male die body (2) is formed by splicing sectioning die sheets and is wrapped outside the core die bush (1), protrusions are arranged in the middle portion of the outer surface of the male die body (2), and rib grooves are formed between the protrusions; the external female die body (3) is wrapped outside the male die body (2), the distance between the external female die body (3) and the outer surface of the protrusions ranges from 1 mm to 5 mm, the external female die body (3) forms an upper-end thickening area (5) in an area without the protrusions, and the male die body (2) forms a lower-end thickening area (8) in the area without the protrusions; and the molding method includes the step that a semi-closed composite material component is manufactured through the die, wherein the upper-end thickening area (5) and the lower-end thickening area (8) are used for paving of prepreg so as to form end frames, and the rib grooves are used for wining of presoaking wires so as to form strengthening ribs. The composite material component is high in strength, and the gridding compactness is high.

Description

technical field [0001] The invention relates to a forming die and method, in particular to a forming die and method for a grid skin structure composite material. Background technique [0002] Grid structure composite materials have the characteristics of good geometric topology optimization, high structural bearing capacity, strong structural buckling resistance, high specific strength and specific stiffness, etc., showing unparalleled application prospects, and have been widely concerned in the aerospace field with application. [0003] The research on grid structure in foreign countries was earlier. In 1981, CRISMB manufactured Russia's first experimental stage of composite material grid structure. The diameter of the cylinder was 1.3m and the length was 1.4m. After several years of development, a cylindrical grid structure product for aerospace with a diameter of 4.2m and a length of 8m has been successfully developed. The U.S. Air Force Laboratory successfully designed...

AI Technical Summary

Problems solved by technology

However, it cannot be molded for the semi-enclosed cavity space surface mesh structure with non-extensible skin, the ribs with longitudinal and latitudinal directions, and the structural members with thickened regions of the end frame.

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