Optimizaing Analysis Of Removal Function In Computer Controlled Optical Surfacing

With the rapid development of astronomy, space sense technology and advanced optical instruments, large aperture and high precision optical surface has been widely used. However, due to the complex structure of aspherical features, classical manufacture methods cannot meet the high precision and efficiency requirements. Computer Controlled Optical Surfacing was first floated by Itek industry in the early 1970s, which has the merit of the removal of deterministic, has been used in the domain of aspherical machining. Aimed at removal function, one of the most important facts, the research we did is as follows.1. The present paper is aimed to derive the removal functions in the two popular running mode planet movement and smooth running. Under the guidance of removal functions properties and mathematics model, taking the degree of material removal concentration relative to the center of material removal within the polishing tool coverage area as evaluation criterion, we optimized the removal functions in the two different mode of motion and got the best combinations of the tool parameters from computer simulation.2. A new optimizing method time-sharing synthesis of removal function was proposed to solve problems of the removal function being far away from Gaussian type and slow approaching of the removal function error that encountered in the mode of planet motion or translation-rotation. Detailed time-sharing synthesis of using four and six removal functions were discussed. The evaluation function when expands any number of removal functions was discussed. After optimization, the optimized combination of tool parameters and distribution of time-sharing synthesis removal functions were obtained.3. New motion mechanism tri-rotors machinery was developed. According to the Preston equation and time-sharing synthesis, we established mathematical models in the modes of tri-rotors movement. Through the simulation based on the emulated material removal function, we get the polishing process technological parameter. The practical process proves that the result is basically equal to the simulation result, which validates the feasibility of this simulation optimization method and has a certain degree of guiding to practical process.4. We studied the performance of removal functions, optimized in the planet movement, smooth running, time-sharing synthesis and tri-rotors movement for error correction by using simulating machining techniques.Experimental results indicate that we provide an instructive idea for the further development of polishing equipment.