• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2015, Vol. 51 ›› Issue (14): 23-28.doi: 10.3901/JME.2015.14.023

• 材料科与工程 • 上一篇    下一篇

超声外场对聚合物注塑充型流动速度场分布影响的物理可视化表征与分析

姜开宇, 吉智, 李豪, 王敏杰, 于同敏   

  1. 大连理工大学模塑制品教育部工程研究中心 大连 116024
  • 出版日期:2015-07-20 发布日期:2015-07-20

Representation and Analysis of Polymer Flowing Velocity Distribution Based on Physical Visualized Technology in Ultrasonic Assisted Injection Molding

JIANG Kaiyu, JI Zhi, LI Hao, WANG Minjie, YU Tongmin   

  1. Molded Products Engineering Research Center of Ministry of Education, Dalian University of Technology, Dalian 116024
  • Online:2015-07-20 Published:2015-07-20
  • Supported by:
    国家自然科学基金(51175060)和国家重点基础研究发展计划(973计划,2012CB025905)资助项目

摘要: 以物理可视化技术为基础,开发一种用于观测超声外场作用下注射成型过程的新型可视化试验分析平台,分析超声振动对聚丙烯(Polyethylene,PP)注射成型流动过程速度场分布的影响,并结合示踪粒子标记法和Kringring插值提出一种充型流动速度场的表征分析方法,研究结果表明,注射成型过程中PP熔体速度分布呈中间高,两边低,近浇口高,远浇口低的变化趋势;施加超声振动后,PP熔体流动速度显著提高,沿流动方向,熔体流动速度变化梯度减小;超声振动有助于降低熔体黏度,但黏度的降低不利于剪切热的生成, 因此并非超声功率越大,对内部熔体速度的提升越大。同时,超声功率的提升还会导致聚合物材料性能的改变,影响制件的最终质量。对于本研究条件下的PP材料而言,超声功率在200~400 W时,对成型效果的改善比较明显。

关键词: 超声振动, 可视化, 流变特性, 速度场分布, 注射成型

Abstract: Based on physical visualized technology, a new visualization device is developed to understand polymer melts flowing behavior in ultrasonic vibration assisted injection molding. The impact of ultrasonic vibration on polyethylene (PP) melts flowing velocity distribution is studied. Combined with tracer particles marking and Kringing interpolation method,a new method is proposed to analyze melts flowing velocity field during injection molding process as well. The results show that the distribution of PP melts flow velocity tends to be high in the middle and near the entrance of the cavity, while low on both sides and the end of cavity. Thermoplastic melts flow is promoted by ultrasonic vibration in mold cavity, and the gradient of melts flow velocity is decreased along melts flow direction as well. Meanwhile, ultrasonic vibration has a benefit on reducing melts viscosity. But, the reduction of melts viscosity goes against to the generation of shear heat. So it is not true that the higher the ultrasonic power is, the greater the speed of melts velocity is. At the same time, the performance of polymer material is changed by the ascent of ultrasonic power which influences the final quality of parts. On the condition of this research, there is a noticeable effect on PP melts shaping when ultrasonic power is between 200 W and 400 W.

Key words: injection molding, rheological properties, ultrasonic vibration, velocity distribution, visualization

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