| Shibin Wu(optical engineering)Directed by Yapei Yang,Jiahu YuanManufacturing technologies for large-aperture lightweight mirror are one of the development directions in advanced optical manufacturing technologies.The lightweight mirror has the incomparable advantages than that of the solid mirror.The lightweight mirror has overcome the mirror surface deformation caused by selfweight of the solid mirror,reduces or eliminates the deformation of thermal expansion in solid mirror surface induced by environmental temperature variations and temperature gradient appeared on mirror body.Mechanical weight-reduction is one of the three lightening technologies for large-aperture mirror.The technology has the advantages of simple process,small technical difficulty,common equipment conditions and wide material selection range.The technology has been extensively investigated and applied in the technical field of optical engineering at home and abroad.This paper mainly aims at the strategic demands for large-aperture lightweight mirror proposed by high-tech development.Its main research contents are: select material blank for lightweight mirror according to physical and chemical properties of optical glass; analyze and calculate the deformation quantity of the mirror with finite element method; design and optimize mirror body structure of φ400 lightweight plane mirror and φ450 lightweight spherical mirror,analyze glass cutting principle,design specisl-use grinding wheel structure, select reasonable technological parameters to implement the processing of weight reduction holes onφ400 plane mirror;analyze etching mechanism of hydrofluoric acid, look for the technological parameters such as the optimal acid concentration and etching time etc.; eliminate the stress of weight reduction holes and micro-cracks onφ400 lightweight plane mirror; discuss the processing principle andtechnological characteristics for separator and finish the processing ofφ400 lightweight plane mirror.The research and completion of the subject has some promoting action for expanding the lightening manufacturing methods of large-aperture lightweight mirror and constructing a technical platform for manufacturing of lightweight mirror.The subject also has important significance for finishing the major items in high-tech field of national defense and space. |
