透镜阵列模压加压过程型腔充型率的有限元仿真

Study on Cavity Filling Ratio of Lens Array in the Process of Compression Molding Pressing Using Finite Element Simulation

采用有限元方法模拟了玻璃透镜阵列模压的加压过程。采用5个单元的广义Maxwell模型和Tool-Narayanaswamy转移方程分别描述高温下玻璃的粘弹性特性和热流变特性。重点分析了玻璃透镜阵列不同位置的模具型腔充型率以及模压温度和模压速度对透镜阵列型腔编号为4的充型率的影响。结果表明,靠近模具边缘的型腔充型率比靠近模具中间的低,模压温度越高充型率越大,模压速度越大充型率越大。

Finite element method is used to simulate the process of the pressing in compression molding of glass lens array. Five-element general Maxwell model and Tool-Narayanaswamy shift function are incorporated into the finite element method to describe the viscoelastic property and the heat flow characteristic of glass at high temperature, respectively. The filling ratios of mold cavity of glass lens array in different locations and the effect of temperature and molding velocity on cavity filling ratios in lens array are emphatically analyzed. The simulation result shows that cavity filling ratios are lower at the edge of the mold than that in the middle of the mold, and the higher temperature and molding speed will lead to higher cavity filling ratios.