不同滑移条件对聚乳酸在异向双螺杆中的挤出过程影响  

Influence of different slip conditions on the extruding process of PLA in counter⁃rotating twin screw

作　　者：徐珍 黄志刚[1,2] 程媛媛 XU Zhen;HUANG Zhigang;CHENG Yuanyuan(School of Artificial Intelligence,Being Technology and Business University,Beijing 100048,China;Plastic Beijing Municipal Key Laboratory of Health and Safety Quality Evaluation Technology,Beijing 100048,China)

机构地区：[1]北京工商大学人工智能学院,北京100048 [2]塑料卫生与安全质量评价技术北京市重点实验室,北京100048

出　　处：《中国塑料》2024年第12期115-122,共8页China Plastics

基　　金：国家自然科学基金面上项目(32172277)。

摘　　要：使用相对运动法推导出端面曲线并建立为三维模型,在Gambit软件中其网格划分后导入Ansys有限元仿真软件,通过在仿真运动过程中设定不同的滑移边界条件来模拟物料在机筒内壁面和螺杆表面上发生的滑移现象,将得到的相关物理场数据用后处理软件以云图和变化曲线形式展现后进行研究分析;计算不同条件下挤出过程的体积流率,并使用示踪粒子法探究物料在流道中的运动轨迹。结果表明,壁面滑移条件有利于提升异向双螺杆在螺杆啮合处的建压能力和剪切能力,螺杆滑移条件有利于挤出过程中流道内压力稳定,使局部高压现象消失,有利于延长机器使用寿命;两种滑移条件都会使异向双螺杆在螺杆与机筒间隙处剪切能力降低;两种滑移条件都会使异向双螺杆挤出流率下降,导致物料在挤出过程中的停留时间变长。End curve is deduced and built in the method of relative motion for the 3 d model,after its meshing in Gambit software into the finite element simulation software Ansys,through the simulation process of motion are set up different slip boundary conditions to simulate the material in barrel inner surface and the screw on the surface of sliding phenome-non,The obtained physical field data were presented in the form of cloud chart and change curve by post-processing soft-ware for research and analysis.The volume flow rate of the extrusion process under different conditions was calculated,and the tracer particle method was used to explore the movement trajectory of the material in the flow channel.It is found that the wall slip condition is conducive to improving the pressure building ability and shear ability of the counter-rotating twin screw at the screw engagement,and the screw slip condition is conducive to the stability of the pressure in the flow channel during the extrusion process,so that the local high pressure phenomenon disappears and the service life of the ma-chine is prolonged.The shear capacity of the counter-rotating twin screw decreases at the gap between the screw and the barrel under both sliding conditions.Both slip conditions will decrease the extruding flow rate of the hetero-twin screw,resulting in a longer residence time of the material during extrusion.

关 键 词：双螺杆挤出机 异向啮合 聚乳酸 滑移现象 有限元分析 

分 类 号：TQ320.663[化学工程—合成树脂塑料工业]