热压成型参数对非球面透镜轮廓偏差的影响  

Effects of Molding Parameters on Profile Deviation of Aspheric Lenses

作　　者：朱科军[1,2] 欧阳波 许博文 徐志强[1,2] 张高峰[1,2] ZHU Ke-jun;OUYANG Bo;XU Bo-wen;XU Zhi-qiang;ZHANG Gao-feng(School of Mechanical Engineering,Xiangtan University,Xiangtan 411105,China;Engineering Research Center for Complex Track Processing Technology and Equipment of Ministry of Education,Xiangtan 411105,China)

机构地区：[1]湘潭大学机械工程学院,湖南湘潭411105 [2]复杂轨迹加工工艺及装备教育部工程研究中心,湖南湘潭411105

出　　处：《表面技术》2018年第7期67-72,共6页Surface Technology

基　　金：国家自然科学基金项目(51775469;51605410);湖南省自然科学基金项目(2015JJ3117);湖南省教育厅项目(16C1549)~~

摘　　要：目的研究玻璃热压成型参数对非球面玻璃透镜轮廓偏差的影响。方法设计正交试验,并通过Msc.Marc软件对玻璃透镜热压成型过程进行数值模拟,在不同热压成型参数组合下,测量透镜轮廓偏差的大小,从而得到最佳热压成型参数组合。接着进行透镜热压试验,观察成型透镜形状与设计值间的偏差,验证仿真分析结果。结果经正交优化分析,热压温度为570℃时,最大轮廓偏差均值为2.876μm;热压速率为0.02 mm/s时,最大轮廓偏差均值为2.808μm;摩擦因数为0.6时,最大轮廓偏差均值为2.780μm;退火速率为1.5℃/s时,最大轮廓偏差均值为1.893μm;保持压力为700 N时,最大轮廓偏差均值为1.775μm;冷却速率为1℃/s时,最大轮廓偏差均值为1.990μm。它们在各自参数组别中都为最小值。优化成型参数组合为:热压温度570℃,热压速率0.02 mm/s,摩擦因数0.6,网格大小0.05 mm,退火速率1.5℃/s,保持压力700 N,冷却速率3℃/s。热压试验测得最大偏差值为1.61μm。结论离透镜中心越远,透镜表面的轮廓偏差越大。热压模型网格划分越细,越能准确地模拟玻璃热压成型过程。热压速率增大时,透镜的轮廓偏差会增大。热压温度升高,透镜的轮廓偏差会减小,但过高的热压温度会使轮廓偏差变大。退火速率、保持压力、摩擦因数增大时,透镜的轮廓偏差会减小,冷却速率对轮廓偏差无明显影响。The work aims to study the effects of glass molding parameters on profile deviation of aspherical glass lenses.Orthogonal test was designed,numerical model of the glass lens molding process was established through Msc.Marc software.The deviation of lens profile was measured in different combinations of molding parameters so as to obtain the optimum combination of molding parameters.Then molding test was applied to the lens,the deviation between finished lens shape and design value was observed to verify simulation analysis results.According to orthogonal optimization analysis,average value of the maximum profile deviation was 2.876μm at the molding temperature of 570℃,2.808μm at the molding rate of 0.02 mm/s,2.780μm at the friction coefficient of 0.6,1.893μm at the annealing rate of 1.5℃/s,1.775μm at the constant pressure of 700 N,and 1.990μm at the cooling rate of 1℃/s.All of them were the minimum in corresponding group of parameters.The optimum combination of modeling parameters was as follows:molding temperature as 570℃,molding rate as 0.02 mm/s,friction factor as 0.6,grid size as 0.05 mm,annealing rate as 1.5℃/s,dwell pressure as 700 N and cooling rate as 3℃/s.The maximum deviation measured in molding test was 1.61μm.The farther it is from the lens center,the larger the profile deviation of the lens surface is.The finer meshes can more accurately simulate glass molding process.The lens profile deviation will increase with the increase of molding rate,and decrease with the increase of molding temperature.However,the profile deviation will increase if the molding temperature is over-high,and the profile deviation will decrease with the increase of annealing rate,dwell pressure and friction coefficient.Cooling rate has no significant effect on profile deviation.

关 键 词：玻璃热压成型 非球面玻璃透镜 轮廓偏差 数值模拟 正交优化分析 

分 类 号：TH164[机械工程—机械制造及自动化]