以超高分子量聚乙烯的圆形轴对称气辅口模挤出为研究对象,在采用Polyflow软件对气辅口模挤出时的等温流动进行数值模拟之后,就入口流率、松弛时间以及零剪切黏度等物性和工艺参数对挤出胀大、速度分布、口模压降和熔体外表面上剪切速率的影响进行了数值模拟和分析。分析表明:气辅挤出是克服超高分子量聚乙烯传统挤出时面临一系列困难的有效加工方式。 Taking the circular axisymmetric gas-assisted die extrusion of UHMWPE as the research object, after numerical simulation of the isothermal flow during gas-assisted die extrusion by Polyflow software, the flow rate, relaxation time and zero Shear viscosity and other physical properties and process parameters on extrusion expansion, velocity distribution, die pressure drop and melt on the outer surface of the shear rate of the numerical simulation and analysis. Analysis shows that gas-assisted extrusion is an effective way to overcome a series of difficulties in ultra-high molecular weight polyethylene extrusion.