塑料挤出复合机分配器流道仿真优化  

Simulation and Optimization of Distributor Flow Channel in Plastic Extrusion Laminating Machine

作　　者：罗良传 陈浩 许锦才 石卫卫 林杏转 殷术贵 LUO Liangchuan;CHEN Hao;XU Jincai;SHI Weiwei;LIN Xingzhuan;YIN Shugui(Institute of Intelligent Manufacturing,Guangdong Academy of Sciences,Guangzhou Guangdong 510075,China;Guangdong Key Laboratory of Modern Control Technology,Guangzhou Guangdong 510075,China;Jiangmen Huilong Plastics Machinery Co.,Ltd.,Jiangmen Guangdong 529080,China)

机构地区：[1]广东省科学院智能制造研究所,广东广州510075 [2]广东省现代控制技术重点实验室,广东广州510075 [3]江门市辉隆塑料机械有限公司,广东江门529080

出　　处：《机床与液压》2024年第12期170-179,共10页Machine Tool & Hydraulics

基　　金：广东省科学院发展专项资金项目(2022GDASZH-2022010108);广州市制造业绿色发展科技协同创新中心建设项目(2023B04J0022)。

摘　　要：针对塑料挤出复合机的分配器流道容易出现塑料熔体滞留时间较长、烧焦等问题,对塑料挤出复合机的分配器流道进行仿真优化。采用质量连续性方程、动量控制方程、四面体网格划分、Carreau模型、仿工况模拟VOF模型、单相流模拟仿真等方法,建立几何模型、数学模型、材料本构模型、内流道网格划分模型等分配器流动仿真模型,对分配器内流道2种塑料熔体的流动过程进行仿工况模拟仿真分析;掌握2种塑料熔体在分配器内流动过程中的速度分布、压力分布等情况,并对分配器原始结构进行压力分布、流线分布、速度矢量分布、出口处流场分析等单相流模拟分析,得到造成熔体滞留的3个主要区域。针对横向扩展段边角处、三股熔体交汇处、靠近出口处等3个主要区域,提出横向扩展段边角处增加导流装置、调整熔体交汇处控制刀具偏角、去掉出口处小台阶等分配器流道结构优化方案,通过对比优化前后结构的压力分布、流线分布、速度矢量分布等单相流仿真结果,发现优化结构明显好于原始结构,分配器流道的压力分布更加均匀,能大大减少这3个区域的熔体滞留,从而能够有效提高挤出塑料复合薄膜成品的质量。Aiming at the problems of long plastic melt retention time and burning in the distributor flow channel of plastic extrusion composite machines,simulation optimization was conducted on the distributor flow channel of plastic extrusion composite machines.Methods such as mass continuity equation,momentum control equation,tetrahedral mesh division,Carreau model,simulated working condition VOF model,single-phase flow simulation were used to establish geometric models,mathematical models,material constitutive models,and the internal flow channel mesh division model,the flow process of two types of plastic melts in the distributor were simulated and analyzed under simulated working conditions.The velocity and pressure distribution of the two plastic melts during the flow process in the distributor were mastered,and the pressure distribution,streamline distribution,velocity vector distribution,and flow field analysis at the outlet of the distributor′s original structure were analyzed through single-phase flow simulation analysis,three main areas causing melt retention were obtained.Aiming at the three main areas including the corner of the lateral expansion section,the intersection of three streams of molten metal,and the vicinity of the outlet,an optimization plan for the distributor flow channel structure was proposed,including adding a guide device at the corner of the lateral expansion section,adjusting the tool deviation angle at the intersection of molten metal,and removing the small steps at the outlet.The single-phase flow simulation results of the pressure distribution,streamline distribution,and velocity vector distribution of the structures before and after optimization were compared and analyzed.The optimized structure is significantly better than the original structure,with a more uniform pressure distribution throughout the distributor flow channel,which can greatly reduce melt retention in the three areas and effectively improve the quality of extruded plastic composite film products.

关 键 词：挤出复合机分配器流道 流场分析 塑料熔体 仿真优化 

分 类 号：TQ330[化学工程—橡胶工业]