A high-precision composite material antenna reflective surface forming method

Abstract

The invention provides a method for forming a high-precision composite antenna reflective surface. The processing steps are: (1) roughening the surface of the antenna reflective surface, and coating the surface of a high-precision mold with a release agent; The resin and the reflective surface are placed in a high-vacuum environment for a long time; (3) Apply the resin to the mold surface in a high-vacuum environment, and press the reflective surface on the resin; (4) After the resin layer is covered with the mold surface, restore Atmospheric pressure; (5) After the resin is cured, the reflective surface is demolded to form a zero-bubble resin layer on the surface of the reflective surface. The invention uses the high precision of the mold surface and the replication ability of the resin to obtain a reflective surface equivalent to the precision of the mold, and at the same time rely on the high vacuum environment to effectively completely remove the resin bubbles, and complete the replication in this environment, while obtaining a high-precision reflective surface , to achieve the zero-bubble state of the surface resin layer, thereby solving the influence of bubbles on the subsequent surface metallization and absorption-emission ratio of the reflective surface.

Description

technical field [0001] The invention relates to a surface treatment method for aerospace structural functional parts, in particular to a method for forming a high-precision composite material antenna reflection surface. Background technique [0002] With the continuous advancement of deep space exploration technology, the demand for large-aperture and high-precision antenna reflectors is becoming increasingly urgent. Composite materials are widely used in the aerospace field due to their light weight and high strength properties. At present, the reflective surfaces of spacecraft antennas have been fully composited. Due to the uneven curing temperature, the mismatch of expansion coefficient between fiber and resin, composite material and mold, the curing and molding of composite materials often deform after demolding, which directly makes it extremely difficult to form a high-precision antenna reflective surface at one time. [0003] The use of replica technology (applying a...

AI Technical Summary

Problems solved by technology

However, in this method, after the epoxy resin is treated in the B stage, its viscosity value will be significantly greater than 2000mPa·s, and then it needs to be pressurized by an autoclave at 0.3MPa to 0.7MPa to cure the resin layer, otherwise the resin layer will be damaged due to excessive viscosity. Large thickness results in a large thickness, which seriously affects the thermal stability of the reflective surface, and a larger pressure will cause the reflective surface to be in a high-stress state due to the strain caused by compression. After demoulding, the product surface shape will be greatly increased due to stress release Deviating from the theoretical value, the accuracy of the reflective surface shape cannot meet the needs of high-precision use. Therefore, the invention patent with the publication number CN 109624163 A focuses on improving the surface finish at low cost, rather than high-precision surface shape.

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