非球面塑料光学透镜收缩变形的数值分析

Numerical Simulation of Shrinkage Deformation for Aspherical Plastic Optical Lens

运用田口实验设计方法,模拟分析不同工艺参数组合下的收缩变形,研究不同工艺参数对非球面塑料光学透镜平均体积收缩率的影响程度.分析结果表明,保压压力、填充时间、熔体温度和浇口尺寸对塑件平均体积收缩率有显著的影响,且影响程度依次降低.正交实验得出其最优化的工艺参数组合:模具温度为45℃、熔体温度为250℃、保压压力为25 MPa、填充时间为6.2 s、保压时间为13 s、冷却时间为38 s和浇口尺寸(宽×深)为3 mm×2 mm.最后,选取保压压力、填充时间、熔体温度和浇口尺寸进行有交互作用的正交试验,结果显示4个参数之间的交互作用对非球面塑料光学透镜的平均体积收缩率影响较小.

Using Taguchi method of experimental design,shrinkage deformation of injection product under different compages of process parameters is simulated and analyzed to study degrees of different process parameters′ effects on average volumetric shrinkage of aspherical plastic optical lens.It can be concluded from analysis results that,effects of packing pressure,injection time,melt temperature and gate sizes on average volumetric shrinkage of products are prominent,the effect degree of which decreases in turn.And the results of orthogonal experiment have shown that,optimum process parameters are： mold temperature is 45 ℃,melt temperature is 250 ℃,packing pressure is 25 MPa,filling time is 6.2 s,packing time is 13 s,cooling time is 38 s and sizes of gate（width and depth） are 3 mm×2 mm.In the end,packing pressure,injection time,melt temperature and gate sizes are selected to conduct orthogonal experiments considering interaction,results have shown that interaction effects between these four process parameters on average volumetric shrinkage of aspherical plastic optical lens are smaller.