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.
引文
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