中国塑料 ›› 2009, Vol. 23 ›› Issue (11): 98-102 .DOI: 10.19491/j.issn.1001-9278.2009.11.020

• 机械与模具 • 上一篇    

啮合同向双螺杆挤出机组合流道的熔体充满长度预测与实验研究

何明 罗兵 江波 梁畅   

  1. 北京化工大学机电工程学院
  • 收稿日期:2009-07-13 修回日期:2009-10-09 出版日期:2009-11-26 发布日期:2009-11-26

Forecast and Experiment Study of Melt Filled Length of Screw Assembled Field in an Intermeshing Co-rotating Twin Screw Extruder

  

  • Received:2009-07-13 Revised:2009-10-09 Online:2009-11-26 Published:2009-11-26

摘要: 使用Polyflow软件对φ34 mm啮合同向双螺杆实验挤出机中由螺纹元件和捏合盘元件组成的组合流道进行模拟,得到不同螺杆相位角下三维流场的压力分布;分析了设置在组合流道内的观测点压力随相位角变化规律,对两种流量下组合流道在挤出过程中的熔体充满长度进行了预测,并对分析结果进行了验证实验。结果表明,通过流场模拟的方法可以预测组合流道在挤出过程中的熔体充满长度,其误差小于10 %。而在预测的充满长度区域,实测的观测点压力波动在预测的压力波动范围内。

关键词: 啮合同向双螺杆挤出机, 螺杆组合, 流场模拟, 充满长度, 预测

Abstract: A simulation of the assembled flow domain composed of screw elements and kneading blocks in an experimental intermeshing co-rotating twin screw extruder with 34 millimeter diameter has been carried on. The pressure distribution of three dimensional flow field at different screw phase angle was obtained. Then the variation of pressure of the observing point located in the assembled flow domain against the phase angle was analyzed. The melt filled length of assembled flow domain in the extruding process was forecasted at two different flow rates. Meanwhile an experiment was made to validate the analysis result. It showed that the melt filled length could be forecasted through the flow field simulation, with an error less than 10%. And in the forecasted filled length, the measured pressure fluctuation of observing point was got within the forecasted pressure fluctuation.

Key words: intermeshing co-rotating twin screw extruder, assembled screw, flow field simulation, filled length, prediction