Research On Grinding Trajectories Of SiC Aspherical Surface Optics

With the rapid development of optical technology and deepen understandingof manufacturing a large diameter of SiC ceramic aspherical optic lens, more andmore researchers focus on how to fabricate an aspheical optic lens efficientlybecause of SiC ceramic’s difficulty to manufacture and the shape of aspherical.According to the above problems, the main works in this paper including:Firstly，we analysis the shortage of grinding a large diameter SiC ceramicaspherical optic lens in traditional ways. The study provides two grindingmethods to fabricate a large aspherical workpiece. According to the kinematiccharacters of the grinding, this paper provides an analytical solution to describethe trajectories of the grinding wheel in manufacturing an aspherical workpieceand two independent movements involved in grinding process. The effects ofgrinding parameters have been conducted based on the established motionequation and been discussed in detail.Secondly, Using UG powerful capabilities of surface modeling andpost-processing function, the UG-based NC code automatically generated. A3-Dmachine model has been built according to the real DMG machine. Setting themachine’s post-process by post builder in UG. Then generate the NC code by thepost-processor and verify the NC code by IS&V simulation.Finally, conducting the effects that grinding parameters, feed spend anddepth of grinding involved, have on the surface roughness of SiC ceramic. Theresults provide a reference for choosing grinding parameters when fabricating anaspherical optic lens. Then put the generated NC code into machine and fabricatethe aspherical workpiece by roughing and finishing, the result reached thedemand of surface error. The results of the study is very important in the area ofSiC ceramics application of aspherical mirror.