微注塑充模流动过程熔体黏度影响规律的数值模拟  

Numerical simulation on effect of plastic melt viscosity in micro-injection molding filling

作　　者：康红梅[1] 张萌[1] 徐林红[1] 

机构地区：[1]中国地质大学(武汉)机电学院,湖北武汉430074

出　　处：《机械设计》2013年第9期82-85,共4页Journal of Machine Design

基　　金：中国地质大学(武汉)中央高校基本科研业务费资助项目(2012079027)

摘　　要：微型塑件注射成型充模流动过程中,与宏观塑件相比,塑料熔体黏度随剪切速率的变化对流动的影响有很大的不同。对比微观和宏观黏度模型,运用流体分析软件Fluent,对微注塑充模流动过程熔体黏度的影响规律进行了研究。分析了熔体黏度的分布规律,结果表明微尺度降低了熔体黏度。研究了微尺度熔体黏度模型对熔体速度场、温度场和压力场的影响规律,结果表明:微尺度黏度模型的速度相对较大,近壁面区熔体温度相对较高,对微通道中的压力分布几乎没有影响。总体而言,由于通道微尺度而造成的熔体黏度变化有利于微注塑成型。During micro-plastic injection molding filling,the plastic melt viscosity change with shearing speed is very different with macro-plastic.The effect of the plastic melt viscosity on the micro-injection molding filling was investigated,compared with micro-viscosity model and macro-viscosity model.The distribution of melt viscosity was analyzed.The result is the microscale model to reduce the melt viscosity.The influence of microscale melt viscosity model to the melt velocity,temperature and pressure distribution was studied.The conclusion is：microscale viscosity model＇s velocity is faster,the melt temperature of the near-wall area is relatively higher; and almost has no effect on the pressure distribution.In general,the viscosity＇s change with micro-scale is conducive to the micro-injection molding filling flow.

关 键 词：微注塑充模 熔体黏度模型 黏度分布 速度场 

分 类 号：TG76[金属学及工艺—刀具与模具]