塑料光学透镜模压成型有限元分析
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摘要
针对一种新型的塑料光学透镜加工技术——透镜模压成型技术,为了快速且以较低成本获取该成型技术较优的工艺参数,基于ANSYS有限元分析软件和透镜材料聚甲基丙烯酸甲酯(PMMA)的特性,建立了PMMA材料的黏弹性模型,然后在不同的模压温度和模压速度下对透镜模压过程进行了仿真,对比分析了这两种工艺参数对透镜成型残余应力的影响。结果表明,随着模压温度的升高和模压速度的降低,成型透镜的最大残余应力值相应减小,当模压温度达到125℃后或模压速度小于1mm/s时,最大残余应力下降趋势趋于稳定。PMMA透镜模压成型适宜的模压温度和模压速度分别为125℃和0.5mm/s。
According to a new type of plastic optical lens processing technology——optical lens compression molding technology,and in order to gain the optimized process parameters of the compression molding technology rapidly with lower cost,a viscoelasticity model of poly(methyl methacrylate)(PMMA) was established base on ANSYS finite element analysis software and characteristics of PMMA lens material.Then,the lens compression molding process was simulated at different molding temperatures and molding speeds,the effects of the two process parameters on the residual stress of the lens were analyzed.The results show that the maximum residual stress of the molded lens decreases correspondingly with the increase of molding temperature and the decrease of molding speed.The decline of the maximum residual stress tends to be stabilized after the molding temperature reaches 125 ℃or when the molding speed is less than 1 mm/s.The proper molding temperature and molding speed of PMMA lens compression molding technology are 125℃ and 0.5 mm/s.
According to a new type of plastic optical lens processing technology——optical lens compression molding technology,and in order to gain the optimized process parameters of the compression molding technology rapidly with lower cost,a viscoelasticity model of poly(methyl methacrylate)(PMMA) was established base on ANSYS finite element analysis software and characteristics of PMMA lens material.Then,the lens compression molding process was simulated at different molding temperatures and molding speeds,the effects of the two process parameters on the residual stress of the lens were analyzed.The results show that the maximum residual stress of the molded lens decreases correspondingly with the increase of molding temperature and the decrease of molding speed.The decline of the maximum residual stress tends to be stabilized after the molding temperature reaches 125 ℃or when the molding speed is less than 1 mm/s.The proper molding temperature and molding speed of PMMA lens compression molding technology are 125℃ and 0.5 mm/s.
引文
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[2]周天丰,解加庆,梁志强,等.光学微透镜阵列模压成形研究进展与展望[J].中国光学,2017,10(5):603-618.Zhou Tianfeng,Xie Jiaqing,Liang Zhiqiang,et al.Advance and prospects of molding for optical microlens array[J].Chinese Journal of Optics,2017,10(5):603-618.
[3]黄汉雄.塑料模压成型技术(一)[J].橡塑技术与装备,2001,27(2):1-5.Huang Hanxiong.Plastics compression molding technology(I)[J].China Rubber/Plastics Technology and Equipment,2001,27(2):1-5.
[4]傅志红,王志伟,尹业刚,等.PMMA变温松弛模量获取方法的实验研究[J].塑料工业,2014,42(9):51-54,79.Fu Zhihong,Wang Zhiwei,Yin Yegang,et al.The experimental study of PMMA variable temperature relaxation modulus method[J].China Plastics Industry,2014,42(9):51-54,79.
[5]邓腾,周国发,宋佳佳.聚合物热黏弹塑性变形微热压成型机理的数值模拟研究[J].中国塑料,2018,32(2):91-97.Deng Teng,Zhou Guofa,Song Jiajia.Study on numerical of thermal viscoelastic plastic deformation filling mechanism in micro-hot embossing process of polymers[J].China Plastics,2018,32(2):91-97.
[6]谢丹,张鸿海,陶晟,等.PMMA微透镜阵列的非接触式热压印制作技术[J].机械科学与技术,2012,31(12):1 955-1 958.Xie Dan,Zhang Honghai,Tao Sheng,et al.Fabrication of PMMAmicrolens array with contactless hot-embossing technology[J].Mechanical Science and Technology for Aerospace Engineering,2012,31(12):1 955-1 958.
[7]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):71-75.Zhu Kejun,Xu Bowen,Zhang Gaofeng,et al.Experimental study on molding process of glass lens[J].Natural Science Journal of Xiangtan University,2017,39(2):71-75.
[8]张静,张钉凡.基于ANSYS的玻璃模压成型有限元分析[J].现代制造技术与装备,2016(10):106-108.Zhang Jing,Zhang Dingfan.ANSYS-based FEA of glass molding press[J].Modern Manufacturing Technology and Equipment,2016(10):106-108.
[9]Yi A,Jain A.Compression molding of aspherical glass lenses-Acombined experimental and numerical analysis[J].Journal of the American Ceramic Society,2010,88(3):579-586.
[10]Ananthasayanam B,Joseph P F,Joshi D,et al.Final shape of precision molded optics:Part I-Computational approach,material definitions and the effect of lens shape[J].Journal of Thermal Stresses,2012,35(6):550-578.
[11]Sarhadi A,Hattel J H,Hansen H N.Evaluation of the viscoelastic behaviour and glass/mould interface friction coefficient in the wafer based precision glass moulding[J].Journal of Materials Processing Technology,2014,214(7):1 427-1 435.
[12]杨挺青,罗文波,徐平,等.粘弹性理论与应用[M].北京:科学出版社,2004:13-21.Yang Tingqing,Luo Wenbo,Xu Ping,et al.Theory and application of viscoelasticity[M].Beijing:Science Press,2004:13-21.
[13]Jalocha D,Constantinescu A,Neviere R.Revisiting the identification of generalized Maxwell models from experimental results[J].International Journal of Solids&Structures,2015,67-68:169-181.