Large-diameter Optical Surface Precision Machining System Developed

With the development of astronomy, space sense technology and advanced optical instruments, large aperture and high precision optical surface has been widely used. However, classical manufacture methods cannot meet its special machining requirements because of its complex surface equation.Advanced optical manufacture technology has been well developed in such nations as US, UK, German and Japan. However, related research in China still lags behind those nations. Some fruits, proposed in China, are still in laboratorial process, which cannot meet the industrial requirements-high speed, high precision and high quality.Based on detailed analysis of large aperture optical manufacture, this paper proposes a novel large aperture high precision optical manufacture system.Firstly, the design method, detail design and locating function are presented. By the virtue of new lathe layout and overturning mechanism, the workpiece will be tested on-machine, which will be helpful to high speed, high precision and high quality manufacturing.Secondly, precision ball bearing, linear guide and AC servomotor are employed in this system. This configuration is helpful to acquire precision and easy-control program. Both stable mechanical structure and precision multi-axis control method ensure manufacture precision with the value of 15μm.Thirdly, ANSYS, which is one of the most popular FEA software, is adopted in critical components static analysis and system dynamic analysis. By the virtue of those results, some improving methods are proposed in this paper.Finally, material removal model and virtual removal effect are acquired based on the principle of CCOS (Computer Control Optical Surface) and concrete polishing pad.