Study On Two-step Compression Molding Of Aspherical Glass Lens

The aspherical glass lens is greatly favored because it can significantly improve the imaging quality of the optical system and make the optical system simpler and lighter in structure.Comparing with the past aspheric lens processing methods,the glass compression molding technology has the advantages of net processing,high quality,low cost and mass production.This article mainly focuses on the forming precision of aspherical glass lens,and studies the two-step compression molding method of aspherical glass lens to improve the surface precision of the molded lens.The main research work is as follows:1.On the basis of the designed aspheric surface,using the circle fitting function in Matlab,the best approximation spherical surface was obtained,and a numerical simulation model of a two-step compression molding process of aspherical glass lens was established in MSC.Marc software.The numerical simulation analysis of the two-step compression molding process of aspherical glass lens was carried out.2.For the accurate compression molding process of the aspherical two-step compression molding method,numerical simulation methods are used to separately perform the five main compression molding parameters of the molding temperature,the molding rate,the friction coefficient,the annealing rate,and the dewell pressure.Factor analysis to study the effect of their number on the profile deviation of the lens surface.The results show that when the molding temperature,friction coefficient,annealing rate,and dewell pressure increase,the profile deviation of the aspherical glass lens decreases.As the molding rate increases,the aspherical profile deviation increases.3.One-step compression molding and two-step compression molding of the lens were simulated numerically,and the results were compared.The maximum profile deviation of the aspheric lens simulated by the one-step compression molding method was 1.52 ?m.The maximum profile deviation of the aspheric lens simulated by two-step compression molding method was 0.83 pm,and the overall lens profile deviation obtained by the two-step compression molding method is smaller than the one-step compression molding method.Therefore,from the simulation analysis results,using two-step compression molding method is beneficial to reduce the profile deviation of the formed lens and improving the surface precision of the formed lens.4.The experiment of single-side aspherical lens compression molding process was carried out,and the experimental results were analyzed.The PV value of the best aspherical lens processed by the two-step compression molding method was 0.4385 ?m.The PV value of the best aspherical lens processed by one-step compression molding was 1.5826 ?m,the PV value of the aspherical glass lens decreased by 1.1441 ?m.From the results of the compression moliding experiment,the two-step compression molding method can effectively improve the surface precision of the molded lens.The simulation results under the best molding parameters agree well with the experimental data,which shows that the numerical simulation of the two-step compression molding process of the aspheric lens can reflect the profile deviation of the formed lens.