Research On The Key Manufacturing Of Light-weighted Structural Part For Double-faced Aspheric Mirror With Large Aperture

The light-weighted structural part for double-faced aspheric mirror with large aperture which contains the aspheric primary mirror and the fourth mirror is the main component of low-temperature glass-ceramic four-mirrors reflex optical system and needs higher requirements of optical surface quality,dimensions and tolerance.Therefore,its manufacturing is one of difficulties problem in the four-mirrors reflex optical system.The study of key manufacturing of light-weighted structural part for double-faced aspheric mirror with large aperture,which will establish manufacturing process specification of aspheric mirror structural part and provide the technological foundation for the manufacture of China's low-temperature aspheric optical system,has a great practical valuable.In this paper,the key manufacturing technologies of light-weighted structural part for double-faced aspheric mirror with large aperture are proposed and researched.The main contributions are as follows:1.Design of null lens.According to the compensation principle of aspheric mirrors and the characteristics of the large aspheric,the initial structure is calculated by using the primary aberration theory.An infinite conjugate three-lens compensation system is designed by using ZEMAX.After the null lens template matching,tolerance analysis and processing assembly,the qualified practical null lens are finally developed.2.Design of testing support frame.Based on the restraint equation,the finite element analysis method is used to simulate V-braced Steel Frames Structure,Flat Sling Structure and Mercury Tube Mounting Structure.The influence of different angles on V-braced Steel Frames Structure is analyzed in detail.And the deformation data of the surface is extracted.In order to evaluate the surface deformation data correctly,the surface deformation data processing software is designed by using MATLAB according to Zernike coefficient fitting scheme.Based on the comparison and analysis of three supported modes,we select the appropriate one.The mechanical structure of that support frame is designed by using SolidWorks software.3.Design of manufacturing technological process.The main processing technology of the light-weighted structural part for double-faced aspheric mirror with large aperture is designed and analysis.Finally,a prototype of the structural part is processed and tested.The results of the processing is given.The experimental results show that the processing mirror structural part can meet the demand of the low-temperature aspheric optical system.