注射成型中LED非球面透镜折射率变化的优化仿真  

Optimized Simulation of LED Aspheric Lens' Refractive Index Variety in Injection Molding

作　　者：罗家胜[1] 杜遥雪[1] 李霆[1] 

机构地区：[1]五邑大学机电工程学院,广东江门529020

出　　处：《五邑大学学报（自然科学版）》2013年第3期46-51,共6页Journal of Wuyi University(Natural Science Edition)

基　　金：广东省自然科学基金资助项目(S2011010000411)

摘　　要：以Sumipex HT55X的聚甲基丙烯酸甲脂为实验透镜材料，以LED非球面透镜作为仿真模型，用模流分析软件MoldFlow对注射成型的LED透镜折射率的变化进行仿真．采用L16（4’）正交实验矩阵，研究了成型参数中模具温度、熔体温度、保压压力、保压时间、冷却时间等5个因素对LED透镜折射率变化的影响，结果表明：1）保压压力对LED透镜折射率的变化影响最大，其次分别为冷却时间、保压时间、模具温度、熔体温度，最佳工艺参数组合为模具温度70℃、熔体温度260℃、保压压力90MPa、保压时间10s、冷却时间14s，其平均折射率变化为0．0068．2）保压压力50～70MPa，透镜的折射率变化随着保压压力的上升而增大；70—90MPa，透镜的折射率变化随着保压压力的上升而减小；90～120MPa，透镜的折射率变化不大．3）采用高的保压压力、适当提高冷却时间。可减小透镜的翘曲变形和体积收缩。改善其内部的残余应力，能使LED透镜的折射率变化减小，提高其光学性能．Sumipex HT55X polymethyl methacrylate was selected as the experiment lens material and LED aspheric lens was chosen as the simulation model. The simulation of LED lens＇ refractive index variety in injection molding was executed by the mold flow analysis software Mold Flow. Adopting the L,6（4） orthogonal experiment array, the effect of the five factors of mold temperatures, melting temperatures, holding pressure, holding time, and cooling time among the molding parameters on LED lens refractive index variety was studied. The results show that： 1） the holding pressure is the principal factor affecting the refractive index variety of LED lens, followed by cooling time, holding time, mold temperature, and melting temperature in a descending order; the optimum combinations of processing parameters were as follows： molding temperature at 70 ℃, melting temperature at 260 ℃, holding pressure at 90 MPa, holding time at 10 s, cooling time at 14 s, and the average refractive index variety at 0.0068; 2） when the pressure was 50 MPa to 70 MPa, the lens＇ refractive index variety increased along with the rise of holding pressure; when the pressure was 70 MPa to 90 MPa, the lens＇ refractive index variety decreased along with the holding pressure＇s raise; when the pressure was 90 MPa to120 MPa, the lens＇ refractive index variety did not change greatly; 3） with high holding pressure and increasing cooling time appropriately, the lens＇ warping distortion and volume shrinkage decreased, and the inner remaining stress was improved, thus decreasing the LED lens＇ refractive index variety and enhancing its optical properties.

关 键 词：LED非球面透镜 注射成型 折射指数 

分 类 号：TH320.63[机械工程—机械制造及自动化]