Polishing device for eliminating coining effect of lightweight reflecting mirror

Abstract

The invention discloses a polishing device for eliminating the coining effect of a lightweight reflecting mirror, which is suitable for a polishing device for machining a reflecting mirror with a large aperture, high lightweight and a high radius-thickness ratio at high accuracy and belongs to the field of machining of optical surfaces. The device consists of a sealing cylinder, a top cover, a support seat, an arc-shaped fixture, an elastic seal ring, a minitype air pump, a precise stop valve, a precise decompression valve, a four-way body and a silicone tube. In the polishing process, high-accuracy polishing is caused by discontinuous elastic deformation of a mirror surface corresponding to an inner cavity hole of the lightweight reflecting mirror and a rib-bonded mirror surface due to impressed pressure, and then the coining effect that the surface is wave-shaped has become a technical barrier of high-accuracy machining of the lightweight structural reflecting mirror. By the polishing device disclosed by the invention, the reflecting mirror is soaked in a seal cavity which consists of the sealing cylinder, the top cover and the elastic seal ring, and the inner cavity of the sealcavity is inflated. The surface of the lightweight reflecting mirror is balanced under the action of gravity, grinding head pressure and reverse inflation pressure, the coining effect is eliminated, and the reflecting mirror with the large aperture and the high lightweight can be machined at the high accuracy.

Description

technical field [0001] The invention mainly relates to a polishing device for eliminating the embossing effect of a lightweight reflector, belonging to the technical field of precision optical processing, in particular to a polishing device for eliminating the embossing effect of a large-diameter, high-light-weight reflector. Background technique [0002] In recent years, with the development of aerospace technology, functional materials with high strength, low deformation and high reflectivity (such as: fused silica, ULE, microcrystal, SiC, etc.) have been rapidly applied in this field. In order to pursue the light-gathering ability and resolution ability of the optical system, and save manufacturing and emission costs, the imaging quality of the system is generally improved by using light-weight and large-size aspheric optical elements, and the thickness of the mirror surface is getting thinner, that is, the diameter of the primary mirror The thickness ratio is getting hig...

AI Technical Summary

Problems solved by technology

[0005] The technical problem of the present invention is to overcome the deficiencies of the prior art and provide a polishing device that eliminates the embossing effect of light reflectors. Effect, which solves the problem of embossing effect caused by external pressure during high-precision polishing of large-caliber, high-quantity, and high-thickness ratio lightweight mirrors

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