注射成型过程熔体前沿充填不平衡现象的试验研究  

Experiment Study on Filling Imbalance Phenomenon of Melt Front during Injection Molding Process

作　　者：姜开宇[1] 横井秀俊[2] 

机构地区：[1]大连理工大学精密与特种加工教育部重点实验室,大连116023 [2]东京大学国际产学共同研究中心

出　　处：《机械工程学报》2009年第2期294-300,共7页Journal of Mechanical Engineering

摘　　要：注射成型的充填平衡性问题是影响塑料制品成型精度的主要因素之一。注射成型过程中,塑料熔体充填型腔时流动前沿会产生左右偏移的现象,从而导致充填的不平衡。为研究这种充填不平衡现象的机理,设计出一套装有红外线纤维传感器的移动式温度测量系统,采用该系统及可视化手段对一模两腔注塑成型过程熔体流动前沿在型腔内的偏移现象进行观察和分析。试验结果表明,不同注射速率下流动前沿的偏移现象及偏移程度也不同,流动前沿的偏移与熔体在流道内的流动行为以及温度场的变化有关。根据试验结果及剪切热理论所建立的流道内熔体流动行为模型可以较好地描述熔体前沿充填不平衡现象的生成机理。流道内熔体流动的示踪试验表明该模型与实际情况相吻合。Filling balance of injection molding is one of the main factors that influence the precision of plastic products. During the injection molding process, when polymer melt is filling the mold cavity, the flow forefront may shift left and right, thus causing filling imbalance. In order to make clear the mechanism of filling imbalance, one set of movable temperature measuring system equipped with infrared fiber sensor is designed. This system and visualization method are adopted to observe and analyze the aforesaid shifting phenomenon. The experimental results show that the shifting phenomenon and shifting degree of flow forefront at different filling speed are also different. The shifting of flow forefront is related to the flow behavior of melt in the runner and the variation of temperature field. A model of flow behavior of melt in the runner is constructed according to the experimental results and shear heat theory. The model can well describe the formation mechanism of the filling imbalance phenomenon. Tracer experiment of melt flow in the runner shows that the model coincides well with the actual situation.

关 键 词：注射成型 充填平衡 可视化 

分 类 号：TQ320[化学工程—合成树脂塑料工业]