Study On Electrorheological Polishing Of Optical Glass

Any nation has great strength, and can't leave its industrial great strength, inparticular manufacturing industry great strength. No matter how the science andtechnology develops for the future, the development of advanced manufacturing isthe eternal theme of human society. The manufacturing industry also will beforever'the chief industry'of the human society. The promotion of themanufacturing industry is the basic measure of our country moving towards theeconomical powerful nation, that is to say, the development level of manufacturingindustry becomes one of the important symbols of national industrial development.Our country economy development only in this way can grasp the initiative toguarantee the state economy security. Now manufacturing industry advancestowards automation, intellectualization, and precise trend, and the developmentlevel of polishing technology is the concrete manifestation of precise degree.Along with development of the communication technology, the picturetechnology and the medical technology, it has the demand for the massivemicro-optical components. Aspheric lens have many merits, such as rectifying theaberration, expanding visible angle, improving the quality of the image and so on,and may make the optical system resolution to enhance, the structure to simplify,and the weight to reduce. This kind of lens has the better radius of curvature, andmay maintain the good aberration revision to obtain the required performance. Theapplication of aspheric lens brings the excellent acutance and a higher resolution,and simultaneously makes the lens miniaturization design into possibility. Thestudies of Electrorheological polishing technology towards the polishing process ofthe optical glass mold have been carried out in this paper.The theory of Electrorheological Effect(1)Concept: Electrorheological Effect means that the rheology of special liquid changeunder the effect of electric field,which almost include the change of flow resistanceand exterior mucosity. liquid that can change rheology under the electric field iscalled Electrorheological Fluids(ERF for short )(2)Theoretical model:In order to understand and apply Electrorheological Effect, many scholarsbuild many model to reseach the principle of Electrorheological Effect. The widelyaccepted truth of Electrorheological Effect theory is the interaction of dispersedparticle, which makes the macro quality of liquid change. So the built model baseson the interaction of dielectric particle.(3)material speciality and requirement:After 50 years reseach on this field, peole summarize some speciality andrequirement for Electrorheological material.(4)influence factor:The factors effecting Electrorheological Effect include electricityparameters(for example the type of electric-field, electric-field intensity, currentintensity),the Permittivity of dispersed phase and continuous phase, the size andshape of the particle, the qaulity and temperature of the dispersed phase particles.Electrorheological polishing experimentsThis device is based on the ZJK7532 of Wuhan numerical control company.The device mainly include the rotating motor,joint shelf,suspending shelf, needlereamer, ring electrode, scroll chuck, insulated plate, electrical source, motorcontroller and a computer, and the device WYKO for inspecting precision of opticsglass surface.The device is below as the picture (1-1) In order to form the effective electric-field, I design the ring electrode, andthere are four holes (besides the four location holes)with different diameters in theup cover, which aim at validating the best polishing effect among the four holes. After choosing the correct parameters and designing the experiment , I polishthe optical glass based on the Electrorheological polishing device and get theroughness of the polished spot.The analysise of experiment resultIt made the polishing experiment on the 36 spots of the Optical Glass based onthe experiment method mentioned in charpter 3 and got the 36 datas respectively.According to the 36 datas, it found the best parameters such as best thickness, bestpower voltage and best space between poles in effecting the polishing results.(1)The effect of surface roughness in different pole spaceFrom figure1-4 to figure 1-6, it is easy to find that the polishing effect is badunder the power voltage 500 and it corresponded with the analyse above that thereis hardly no columniation which meant bad polishing effect. With the increase ofthe voltage the polishing effect got better, but the roughness is no different under thepole space 1.25mm. So we can directly get rid of power voltage 500 and pole space1.25mm. (2)The influence of thickness to surface in different power voltageFrom figure1-7 to figure 1-9, it is obvious that the roughness value is veryhigh under the grid thickness 15%, meanwhile it is found that the roughness valueis low under power voltage 1500 compared with the power voltage 1000 and 2000. (3)The influence of pole space to surface under different grid thicknessFrom figure1-10 to figure 1-11, the roughness value under pole space 2.5mm islower than under the pole space 1.5mm. Furthermore the roughness value is lowestin the 36 spots under the grid thickness 10% and pole space 2.5mm. So it chosegrid thickness 10% and pole space 2.5mm as the optimum parameters. This dissertation combine the Jilin provice excellent youngth reseach project"The research on Electrorheological polishing micro Asphericmold"(No.20050121),mainly analyse the principle of the Electrorheologicalpolishing and conduct experiments.(1)It made research on the principle of Electrorheological Effect on polishing ofOptical Glass and brought out the mothed of ring electric field with tool pole andring pole,(2)It made research on Electrorheological Fluids which is made up of silicon oil ascontinuum phase and fecula as dispersing phase.(3)It built the Optical Glass polishing device composed of rotating motor, 3-clawchuck, ring pole and insulated components.(4)It made research on influence of power voltage, pole space, grid thickness tosurface roughness value, and the experiment results showed that the surfaceroughness value decreased with power voltage from 0 to 1500, but the roughnessvalue changed little with with power voltage from 1500 to 2000; the surfaceroughness value increased with the pole space decreasing; the surface roughnessvalue decreased with grid thickness from 5% to 10%, but the surface roughnessvalue increased with grid thickness from 10% to 15%.