Theoretical and experimental study of the evolution of surface textures during wheel polishing with fluid cutting model

Abstract

Metal mirrors with ultra-smooth surfaces have a wide range of applications in X-ray and other optics. The fabrication of X-ray mirrors usually requires high-precision turning and grinding, which has a periodic texture with anisotropic characteristics. To obtain a stable low roughness surface over the full-aperture surface, it is crucial to study the evolution law of these textures during polishing. In this article, a model for the evolution of periodic texture roughness based on contact mechanics and fluid micro-cutting has been established. It was found that the fluid cutting stress caused by the periodic texture orientation had a significant impact on the evolution of roughness. When the orientation of periodic texture is perpendicular to the rotation direction of polishing wheel, the contribution of fluid micro-cutting to the evolution of the roughness reaches its maximum. The evolution speed of surface roughness is the fastest. Polishing experiments using single direction rotating wheel on turned electroless nickel plate were performed to verify the theory. The experimental results were in good agreement with the theoretical results. This work shows that the fluid micro-cutting plays an important role in the evolution of periodic texture roughness. It provides useful guidance for full-aperture polishing of anisotropic textures.

Keywords

Wheel polishing / Anisotropic periodic textures / Roughness evolution law / Fluid cutting model

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Funding

National Key Research and Development Program of China(No. 2023YFA1608600)

National Natural Science Foundation of China(No.12235011)

RIGHTS & PERMISSIONS

Shanghai University and Periodicals Agency of Shanghai University and Springer-Verlag GmbH Germany, part of Springer Nature