عنوان :
شبيه سازي، تحليل و بهينه سازي فرايند پرداخت نانو متري سطوح لنزهاي اپتيكي
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
طراحي كاربردي
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك
صفحه شمار :
شانزده،114ص.: مصور،جدول،نمودار
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
پيمان مصدق، سعيد بهبهاني
توصيفگر ها :
فرايند پرداخت به كمك كامپيوتر , گسسته سازي مسير , بهينه سازي زمان مكث , تابع نرخ براه برداري , منطق فازي
تاريخ نمايه سازي :
4/3/93
استاد داور :
عليرضا فدايي، جعفر صديق
چكيده انگليسي :
Simulation Analyzing and Optimization of the Nano Finishing Process of Optical Surfaces Rasool Koosha r koosha@me iut ac ir January 21th 2014 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisors Peiman Mosaddegh mosadegh@cc iut ac ir Saeed Behbahani behbahani@cc iut ac ir Abstract Extensive growth of opto electronic technologies has created a demand for high quality glass lensesand has driven the optics industry toward more efficient processes for the manufacturing of moderatevolumes of different glass lenses For example optical aspherical lenses are highly demanded to obtain highquality images in many different devices such as microscopes telescopes digital cameras and camcorders Manufacturing techniques to produce different type of glass lenses have opened a new window to researchersall around the world As a result lots of new techniques have been invented and consequently manycompanies have been established Surface polishing is the last and the most important step during optical lensmanufacturing It has attracted lots of attention during the last two decades and new methods for polishing orsome techniques to optimize old method to gain better result have been developed Up to now more than 50methods are invented and used to polish optical glass surface and each method is followed with someoptimizations technique In this research first a broad investigation was performed over almost all advancedpolishing techniques which are used in the world Then based on the equeipment and cost Computer ControlPad Polishing was selected as the best way to conduct polishing process Operating the polishing process offlat surfaces modeling and simulation of CCP process is the key factor to optimize the polishing processparameters Therefore optimizing the polishing process simulation can not only improve the quality of finalproducts but also can reduce the time of polishing process and consequently leads to accelerate optical lensmanufacturing In this study a new method based on discretizing the tool path is developed to simulatepolishing process As a result any tool path can be easily modeled Converting continuous tool path todiscrete points with small distance would improve surface quality in an optimum time and also it reducesfluctuation of tool feed rate A new fuzzy optimization method was also applied to optimize dwell times toimprove surface quality The methodology developed in this study is used for plano plano lenses Theexperimental results show that around 90 reductions in surface error both PV and rms are achieved whichare in good agreement with the simulation Regarding polishing of the spherical surfaces first the methodhas been presented for the simulation of polishing process of plano plano surfaces was developed forspherical surfaces Then it was converted to a matrix equation with dwell time vector as variables and thefinal surface point heights as the answer vector Therefore the time of the computational processes wasdecreased significantly Consequently numerical optimization methods could be used for dwell timeoptimization An algorithm was also designed and applied to optimize dwell time in order to improve surfaceprofile in minimum time Finally by means of the method developed a 3 axis CNC machine wasprogrammed to operate the polishing process of a spherical glass lens Conclusively enough the experimentalresults demonstrated around 80 decrease in surface roughness both PV and rms Keywords Computer Controlled Polishing CCP Tool path discretization Dwell time optimization ToolInfluence Function TIF Optical lenses Fuzzy logic Simulation
استاد راهنما :
پيمان مصدق، سعيد بهبهاني
استاد داور :
عليرضا فدايي، جعفر صديق