大口径SiC反射镜用金属基圆弧砂轮在线整形装置研制

摘要

针对空间光学系统中大口径SiC反射镜非球面磨削用金属基圆弧砂轮,提出并推导了双轴回转展成运动下脉冲放电修整圆弧的形成机理.在分析长春光学精密机械与物理研究所(长光所)4m口径SiC反射镜的非球面磨削运动的基础上,确定了有效磨削圆弧段及其半径和杯形电极的尺寸,针对长光所五轴联动数控磨床设计了金属基圆弧砂轮的在线整形装置,并通过圆弧整形实验进行了验证.结果表明,所设计的金属基圆弧砂轮在线整形装置能够很好地修整出目标圆弧,满足4m大口径SiC反射镜非球面磨削的需求.%In respect to metal-bonded arc grinding wheels for the aspherical grinding of large-aperture SiC reflection mirrors in space optical system,the formation mechanism of the arc with pulsed discharge under double rotating axes was proposed and deduced.Based on the analysis of the aspherical grinding of 4 m large-aperture SiC reflection mirrors in CIOMP(Changchun institute of optics,fine mechanics and physics),the effective grinding arcs and their radius and the dimensions of cup-shaped electrode were determined.An in-process trueing device for the metal-bonded arc grinding wheels was designed according to the 5-axis CNC grinding machine in CIOMP.The device was verified by the arc trueing experiments.The results show that the designed in-process trueing device of metal-bonded arc grinding wheels may well trim the target arc and meet the requirements of the aspherical grinding for 4 m large aperture SiC reflection mirrors.