超声外场作用下聚合物注射成型模内流动行为的物理可视化分析  

Polymer Flowing Behavior Analysis of Ultrasonic Vibration Assisted Injection Molding Based on Physical Visualized Technology

作　　者：姜开宇[1] 吉智[1] 李豪[1] 王敏杰[1] 于同敏[1] 

机构地区：[1]大连理工大学模塑制品教育部工程研究中心,辽宁大连116023

出　　处：《高分子材料科学与工程》2015年第7期101-106,共6页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(51475071);973计划项目(2012CB025905)

摘　　要：以3.5mm矩形平板塑件注射充模过程为研究对象,开发一种用于超声辅助成型技术观测的新型可视化试验分析平台,通过在模具型腔上施加超声振动,研究超声振动对聚丙烯(PP)熔体前沿流动速度以及流动轨迹的影响。结果表明,超声振动能提高PP前沿流动速度(400 W超声时,最高可使前沿流速提高18.0%),充模前期超声振动对提升前沿流速的贡献最大,但是充模中后期,超声振动和剪切热的共同作用决定着前沿流速的大小;同时,超声振动对冷凝区的改变是PP流动轨迹出现分散流动延后变化的主因。In this research,filling process of 3.5mm retangular plastic injection process was studied.For understanding behavior of polymer melts flows in injection molding with help of ultrasonic vibration,a novel visualization device was developed.By the device and the method,influence of ultrasonic vibration on filling front velocity and velocity distribution of PP melts within cavity were discussed.The results show that the filling front velocity is improved by ultrasonic vibration（filling front velocity is improved by 18.0% at most,under ultrasonic power of 400W）.At the early stage of filling process,the contribution of ultrasonic vibration to improvement of melts front flow is the largest.However,during the mid and last filling process,melts front flow velocity is determined by the combination of ultrasonic vibration and shear heat.Besides,the main reason for delay of PP dispersed flow is the vibration of condensing zones caused by ultrasonic vibration.

关 键 词：超声振动 注射成型可视化 流变特性 流动速度 流动轨迹 

分 类 号：TQ320.662[化学工程—合成树脂塑料工业]