Research On The Improvement Of Optical Mirror Processing Technology Based On CCOS Principle

Computer Controlled Optical Surfacing(CCOS)is widely used in the processing of small and medium-aperture optical mirrors.This technology is represented by small grinding head technology.The development of technology and higher processing requirements also promote the integration of this technology More and more advanced processing technology.The machining process starts with the rough grinding of a single-axis machine,and after the optical element surface profile reaches a certain level,the CCOS machining machine tool is used to further reduce the pv and rms values until the machining requirements are reached.This paper adopts the method of combining theoretical model and experimental verification.First,based on the theoretical basis of mirror processing,the removal function formula is derived;in order to obtain a stable and applicable removal function,the influencing factors of the removal function are studied through array comparison experiments,and the subsequent processing The experiment provides the technological basis.Secondly,transform the traditional manual single-axis machine into an active single-axis machine to realize the automatic processing of optical components;through modeling,the relationship between the moving distance of the active shaft and the moving distance of the center of the grinding disc on the optical element is obtained,and a relatively accurate position is obtained.Algorithm to correct the mechanical error caused by the swing arm of the machine tool,which is neglected in the traditional production process,to obtain more precise processing point positioning.According to the Preston equation and the analysis of the trajectory of the workpiece,the active single-axis machine motion model is established,and the residence time function is derived.Finally,perform motion modeling on the CCOS machine tool,determine the processing point distribution of the machine tool for each point on the surface of the component to be processed in the three-dimensional coordinate system,analyze the running track of the grinding disc,and study two operating modes,grid translational processing and spiral processing.The removal function formula is deduced separately,and the superiority of the mixed processing method is verified by comparing two sets of experiments combining pure machine tool processing with machine tool processing and manual processing under error processing conditions.Finally,the goal of optimizing the processing of optical components starting from rough grinding is achieved.