Size accuracy control method for large-sized low-density long fiber needle structure

Abstract

The invention relates to a size accuracy control method for a large-sized low-density long fiber needle structure. The method comprises the steps that a heat convertible resin solution with a certaingel content is prepared; the heat convertible resin solution is uniformly sprayed onto the surface of a structural fiber layer by using a spraying device or tool, the heat convertible resin solution is deposited on surface layer fiber to form a rigid layer, the rigidity of the fiber surface is improved, a rigid support is provided for the whole large-sized low-density long fiber needle structure,and the problems are solved that deformation is easily caused in the forming process, and the size accuracy control difficulty is high. In the subsequent process, it is not required that extra flexible protection is provided for the low-density long fiber needle structure, and the operation is convenient.

Description

technical field [0001] The invention relates to a dimensional accuracy control method for large-sized low-density long-fiber needle-punched structures, belongs to the technical field of thermal protection structure product molding, and is applied to the development of a thermal protection system for an aircraft at a second cosmic speed. Background technique [0002] During the return flight process, the manned spacecraft needs to experience high heat flow, and the outer surface of the returning aircraft must be protected by a thermal protection system. With the continuous development of deep space exploration technology, traditional heat protection materials cannot meet the needs of the heat flow environment of the second space flight speed. One development direction of the thermal protection system is to use low-density long-fiber needle-punched structure and integrally formed thermal protection materials. The reinforcement of the low-density long-fiber, integrally formed ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, and to provide a method for controlling the dimensional accuracy of large-sized low-density long-fiber needle-punched structures, so that the thermosetting resin solution is deposited on the fiber surface to form a certain rigid coating, which is the entire large-sized The low-density long-fiber needle-punched structure provides rigid support, which solves the problems of easy deformation and difficult control of dimensional accuracy during the molding process

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