硫系玻璃非球面透镜的模压温度与应力研究
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摘要
在硫系玻璃模压成形技术中,为确定适宜工艺参数和降低残余应力,提高模具精度和玻璃表面成形质量,建立基于非线性有限元分析法的硫系玻璃非球面透镜的模压成形模型。采用二维轴对称模型分析,五单元的广义Maxwell黏弹性模型作为输入模型,通过此模型研究非球面透镜在不同温度下的热量扩散和应力分布情况,并研究模压后非球面透镜表面位移、速度、温度和残余应力的关系;再用仿真结论指导试验完成,得出红外硫系玻璃IG5非球面透镜模压的适宜温度为315℃左右,压造时间为60s。
In the chalcogenide glass molding process,in order to determine suitable process parameters and reduce residual stress,a model of die forming of chalcogenide glass aspheric lens is established on the basis of nonlinear finite element analysis method with a view to enhancing the accuracy of mold and the quality of glass surface forming.Using the 2-D axisymmetric model to analyze the five element generalized Maxwell viscoelastic model as the input model,heat diffusion and stress distribution of the aspheric lens are explored at different temperatures,shedding light on the relationship among surface displacement,velocity,temperature and residual stress of the aspheric lens after molding.Furthermore,the simulation experiment is used to validate the conclusion that the aspheric lens of infrared chalcogenide glass IG5 ismolded optimally at about 315℃for 60 s.
In the chalcogenide glass molding process,in order to determine suitable process parameters and reduce residual stress,a model of die forming of chalcogenide glass aspheric lens is established on the basis of nonlinear finite element analysis method with a view to enhancing the accuracy of mold and the quality of glass surface forming.Using the 2-D axisymmetric model to analyze the five element generalized Maxwell viscoelastic model as the input model,heat diffusion and stress distribution of the aspheric lens are explored at different temperatures,shedding light on the relationship among surface displacement,velocity,temperature and residual stress of the aspheric lens after molding.Furthermore,the simulation experiment is used to validate the conclusion that the aspheric lens of infrared chalcogenide glass IG5 ismolded optimally at about 315℃for 60 s.
引文
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[6] CURATU G.Design and fabrication of low-cost thermal imaging optics using precision chalcogenide glass molding[C]//Proceedings of SPIE.San Diego:The International Society for optical Engineering,2008,7060:706008-1.
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[8] CHA D H,PARK H S,HWANG Y,et al.Experimental study of glass molding process and transcription characteristics of mold surface in molding of aspheric glass lenses[J].Optical Review,2011,18(2):241.
[9]尹韶辉,朱科军,余建武,等.小口径非球面玻璃透镜模压成形[J].机械工程学报,2012,48(15):182.
[10]朱科军,许博文,张高峰,等.玻璃透镜模压成形工艺试验研究[J].湘潭大学自然科学学报,2017,39(2):73.
[11]成虎.硫系玻璃原料提纯及模压成形工艺研究[D].西安:西安工业大学,2017.
[12]倪佳佳,范玉峰,陈文华.非球面光学玻璃透镜的模压仿真研究[J].激光与光电子学进展,2013,50(3):158.
[13]张义同.热粘弹性理论[M].天津:天津大学出版社,2002:9.
[14]王丽荣.用于精密模压的低熔点玻璃[J].玻璃与搪瓷,2012,40(3):29.
[15]周小勇.单工位模压机床设计及硫系玻璃模压成形试验研究[D].长沙:湖南大学,2016.
[16]汪旺.光学玻璃精密模压成形设备模具研制[D].深圳:深圳大学,2017.
[17] YAN J,ZHOU T F,MASUDA J,et al.Moldeing high-temperature glass molding process by coupling heat transfer and viscous deformation analysis[J].Precision Engineering,2009,33(2):150.
[18]尹韶辉,王玉方,朱科军,等.微小非球面玻璃透镜超精密模压成形数值模拟[J].光子学报,2010,39(11):2020.