Research On Robotic Bonnet Polishing Platform And Process For Ultra-Precision Optical Components Manufacturing

With the advancement of high-precision optical component technology,there is a growing demand for complex surface processing of typical optical components such as optical glass.The conventional polishing process neither meet the requirements of high precision for the workpiece in the processing method nor polish for the complex surface.At present,China is mainly in the laboratory and research institutes to carry out ultra-precision processing for complex surface optical components,this has seriously hindered progress,and still exists a large gap between the and Europe and the United States which own high-end equipment industry.so there is an urgent need for a large size optical complex surface components polishing processing platform and the corresponding efficient process.This paper takes Kuka robot as the main equipment,designs and manufactures the bonnet polishing actuator for ultra-precision polishing,and designs and manufactures a series of polishing grinding head,workpiece fixture and platform and other facilities;realizes the integration of various functions such as bonnet polishing,online dressing,bonnet polishing grinding head surface quality inspection and vibration measurement and reconstruction;and on this basis,in order to solve the vibration problem in polishing,proposes a new spindle variable speed machining strategy,combines the simulation results with the actual machining scheme,effectively suppresses the vibration within the common machining speed,and reduces the surface roughness through vibration suppression.In order to better fit the actual production,the removal function was explored from a single-point processing area study,and the polishing path was optimized based on the removal function,and orthogonal test were carried out to study the material removal of the self-built platform under multi-factor composite conditions,and the corresponding process was obtained under the optimal combination of parameters.(1)Independently build the bonnet polishing processing platform for optical componentsOptical glass as a typical optical component,from the perspective of equipment selection,function optimization,manufacturing,integration building and trimming,we build the bonnet polishing platform independently.With the high degree of freedom of the robot,we could meet the needs of machining in different macro dimensions.The platform integrates various functions such as bonnet polishing processing,real time bonnet trimming and real time feedback of polishing vibration,which meets the demand of ultra-precise bonnet polishing of optical glass from the perspective of equipment and has the advantages of large processing speed range and stable processing status,which lays the equipment foundation for subsequent polishing processing.(2)A novel vibration suppression strategy for spindle variable speed machining based on this platformVibration testing and simulation experiments based on this platform are carried out with the help of vibration sensors,and the vibration suppression effect on actual machining is achieved by actively deviating from the resonance frequency band and changing the overall self-excitation system of the equipment on the research scheme of spindle variable speed as the main robot.The effect of amplitude,spindle speed,and operating cycle on actual machining based on this strategy is also studied in conjunction with the machining vibration suppression strategy.The process and the applicability of the solution are prepared for the subsequent processing of optical glass by two rounds polishing under controlled conditions.(3)Ultra-precision processing of optical glass surfaces using a high-efficiency,high-quality polishing processThe effect of a single factor on material removal rate and surface roughness is studied from polishing a single point,and the respective applicable machining range of constant speed mode and spindle variable speed mode is determined.Based on the results of the single-factor study with the removal function to provide support for the polishing path,and combined with orthogonal test,the optimal combination of process parameters for two rounds of polishing processing optical glass was obtained.The surface roughness is 5.25 nm after first round polishing for material removal and 3.72 nm after final polishing for surface shaping.The surface roughness of the optical glass is reduced from 2.5μm to 3.72 nm after 20 minutes.In summary,this thesis has achieved a preliminary ultra-precision bonnet polishing process of optical glass at the micro-nano scale on a self-built bonnet polishing platform.