螺杆结构对熔融金属挤压成型流场分布的影响研究  

Influence of the screw structure on the flow field distribution in molten metal extrusion molding

作　　者：于天艺 曹曾[2] 徐红兵[2] 张冰[1] YU TianYi;CAO Zeng;XU HongBing;ZHANG Bing(College of Mechanical and Electrical Engineering,Beijing University of Chemical Technology,Beijing 100029;Southwest Institute of Physics for Nuclear Industry,Chengdu 610041,China)

机构地区：[1]北京化工大学机电工程学院,北京100029 [2]核工业西南物理研究院,成都610041

出　　处：《北京化工大学学报（自然科学版）》2022年第4期91-95,共5页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：国家重点研发计划(2017YFE0301305)。

摘　　要：基于无限大平板模型进行挤出过程的压力公式推导,开展单螺杆结构对于熔融金属挤出过程的流场分布影响研究。将机头压力损耗计算所得压力数值与单螺杆挤出机建压数值进行对比,从而判断单螺杆挤出机挤出能力。采用ANSYS中的POLYFLOW模块对挤出过程进行仿真模拟,该模块采用网格叠加技术,模拟熔融状态下金属锡的挤出,其中忽略了惯性和重力影响的三维计算,对螺杆进行最优化设计。研究发现减小挤出机的机筒间隙及螺距可以增加螺杆元件对物料的输送能力,且由于金属具有超高流动性,在挤出中并不需要有完整的固体塞段。通过理论分析得到最优螺杆设计参数并完成样机制备,通过实验验证设备的可行性,最终结果表明所设计小型单螺杆挤出机能够实现金属锡的连续均匀挤出。Based on the infinitely large plate model,the pressure formula for an extrusion process is derived,and the flow field distribution for a single screw in the extrusion of molten metal is studied.The extrusion process is simulated using the POLYFLOW module in ANSYS by comparing the pressure value of the pressure loss calculation and the pressure building capacity of the single screw.This uses mesh superposition technology to simulate the extrusion pressure of metallic tin in the molten state,and ignores three-dimensional calculations of the influence of inertia and gravity,allowing the design of the screw to be optimized.It is found that varying the barrel clearance and pitch reduction of the extruder can increase the material conveying capacity of the screw element,and it is not necessary to have a complete solid plug section in the extrusion process because of the ultra-high fluidity of metal.Through theoretical analysis,the optimal screw design parameters are obtained.The feasibility of the equipment is verified by experiment,and it is shown that the small single screw extruder can afford continuous uniform extrusion of metallic tin.

关 键 词：金属 熔融挤出 单螺杆 流场分布 

分 类 号：G305[文化科学]