Research On Design And Polishing Process Of New Wheel Polishing Device

With the development of modern optical systems,the complexity and demand for optical mirrors are increasing.Computer controlled optical surface molding(CCOS)technology has developed rapidly since its introduction in the 1970 s.Compared to traditional methods of machining aspheric surfaces,CCOS technology has more deterministic material removal characteristics and higher surface convergence efficiency.Among them,the small tool polishing technology is compared with other branches of CCOS technology such as magnetorheological,stress disk and ion beam.The small tool polishing technology has the advantages of easy processing and investment cost under the premise of ensuring certain processing precision and processing efficiency.It has low advantages and is therefore widely used in the polishing process of optical aspherical mirrors.At present,the planetary motion polishing device mainly used in CCOS small tool polishing technology has limitations on its movement mode,resulting in loose structure,large moment of inertia,and small supported moving speed,resulting in limitation of polishing efficiency;The head and the mirror are not ideally attached,and the removal function is not Gaussian;in addition,when the edge of the mirror is polished,the pressure of the disc grinding head is sharp after the dew,and there is edge stress concentration.It solves the problems of unsatisfactory polishing efficiency,insufficient polishing(removal function)stability and edge effect in CCOS gadget polishing technology.Combined with the existing robot polishing platform.This paper has carried out related research on the tool wheel polishing technology:(1)Based on the finite element method,the wheel polishing contact pressure is simulated and modeled,and the wheel polishing speed field is analyzed and modeled.Combined with the basic theory of CCOS technology,the wheel polishing removal function is established to explore the removal function characteristics and different processes.The effect of parameters on the removal of function morphology.(2)Combining the simulation analysis results with the actual application conditions,design a new wheel polishing device suitable for the robot platform,realize the wheel polishing method,realize the uniaxial rotation polishing wheel and rotate around its midpoint through reasonable mechanism design.On the basis of the high speed provided to ensure high removal efficiency,the Gaussian-type distribution with the center of the function and the center peak is removed,which meets the surface convergence requirements after mirror polishing.It makes it possible to improve efficient material removal efficiency in polishing.(3)Further research on the wheel polishing process,obtain the actual removal function,verify the removal function simulation results,and carry out a series of removal function experiments,verify the stability of the removal function obtained by the wheel polishingmethod,and explore the process parameters.The influence of the wheel polishing removal function,and the mirror full-caliber polishing process,verify the feasibility of the wheel polishing process complex aspheric mirror,and accumulate relevant process data.(4)Based on the segmented trajectory integration method and finite element analysis method,the edge effect of the small tool polishing technology is modeled,the edge contact pressure model and the edge removal function model are obtained,and the experimental verification of the model is designed to explore the wheel polishing.Edge removal characteristics.As a result,the edge stress concentration of the surface wheel type grinding head is weak and the disc type grinding head,the edge removal function can maintain the original shape well,and when the mirror edge is processed by the wheel polishing,it is not easy to cause the edge collapse,and the edge effect is suppressed.potential.