Device Design And Filling Performance Simulation Of Ultrasonic Vibration Assisted Optical Element Molding

The main research is focused on optical elements with microstructure including micro-grooves,micro-prisms and micro-lenses.Glass molding press is an effective approach to fabricate microstructures optical elements on glass,however,the profile accuracy and filling rate of optical elements is not satisfied due to the complexity of geometric shape of microstructures,and the surface defects occurs easily because of the adhesion between glass and the mold surface during the molding.In this research,ultrasonic vibration assisted GMP is proposed to improve the filling ability of molding;and the main research works and achievements are following:(1)In order to improve the molding accuracy of optical element,a high precision ultrasonic vibration assisted GMP device has been developed according to the principle of vibration assisted molding.Ultrasonic vibration system,servo motor cylinder press and control system,heating and temperature control system,atmosphere protection and cooling system are designed.The electromechanical state equation and sandwich piezoelectric transducer is introduced and designed In addition,the ultrasonic horn and tool head are designed and manufactured.(2)The theoretical FEM analysis on designed horn is simulated and verified by experiments.The influence of temperature on the resonant frequency of the horn is discussed;the structural dimensions of the horns under different molding temperature are optimized based on the simulation results in order to improve the stability of vibration horn under high temperature,and the horns used for different molding temperatures are manufactured.The detected resonant frequency of optimized horn is very close to the simulation results,and it is still stable at high temperature,therefore the vibration stability of the horn is improved.(3)The array model of multiple V-groove structures is established by using the finite element software MSC.Marc.The effect of the filling performance with and without ultrasonic vibration is analyzed.The simulation results show that the filling performance of the V-groove optical element is improved under ultrasonic vibration condition.