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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。
Micro-plastic injection molding filling flow process, compared with the macro plastic parts, plastic melt viscosity changes with the shear rate on the flow of the impact is very different. By comparing the microscopic and macroscopic viscosity models and using the fluid analysis software Fluent, the influence law of the melt viscosity of the micro-injection molding process was studied. The distribution of melt viscosity was analyzed. The results showed that the micro-scale reduced the melt viscosity. The influence of microscale melt viscosity model on the melt velocity, temperature and pressure fields was studied. The results show that the microscale viscosity model is relatively fast and the melt temperature in the near wall region is relatively high. The pressure distribution has almost no effect. In general, changes in melt viscosity due to channel microscale favors micro-injection molding.