Research On High Speed NC Processing Technology Of Aspheric Surface

With the development of national defense industry, aerospace industry and civil optical technology, various kinds of high performance aspheric optical lens have been developed and widely used in the high performance optical systems. Compared with the spherical optical accessory, the aspheric lens can correct aberration, simplify system structure and improve the accuracy of system.. Singles-point diamond turning has become a standard machining process of producing precision optical surface requiring high geometrical accuracy together with fine surface integrity. Especially, diamond turning has found broad applications in area of axisymmetric optical surface generation, such as high-power laser reflecting mirrors and precision aspherical molding dies.The form accuracy of aspheric surface is affected by the relative motion of work-piece and tool. To realize the ultra precision of the aspheric optics, the thesis deals with the forming principle of machining motion.(1)It develops the linear line guide mode that a linear motor carrying the diamond tool combined with a tool servo. The tool servo synchronizes the linear movement of the cutting tool and the motion of the work-piece spindle, a complex precision aspheric surface can be generated. And paper put forward a control method to control the uniform removal quantity in wedge aspheric turning.(2)Aiming at the machining principle of aspheric optical lens, a series of machining methods have been put forward to improve the machining accuracy and efficiency. Base on these technologies, the control system of high precision aspheric machining has been realized. The research emphases include the installation and position of aspheric work-piece in turning procedure, accuracy influence of feed speed, mathematics model and application of various aspheric surface formula and removal quantity control method.(3)The paper put forward a machining error processing method of aspheric. The old error compensate method superpose the error data to ideal aspheric surface. However the new method builds the model to analyze the reason of error come into being, it can act as separating the system error from machining error data, updating the spindle length data, and preparing the error compensate data. It can improve machining accuracy more.According to the experiment, the system construction and testing platform can run steady, and to meet the needs of certain error range. It will contribute to the theory and practice guidance for developing ultra-precision machine system, and realizing manufacture of complex aspheric optics efficiently at lower cost.