微孔塑料挤出成型熔体流变行为分析及影响研究

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中图分类号：TQ320.63 文献标志码：A

Analysis of melt rheological behavior and research on its influencing factors in microcellular plastic extrusion molding

ZHANG Huanke，LI Juntao （Xuchang Vocational College of Electrical Engineering，Xuchang 461OOo，Henan China）

Abstract：To accurately control the die swelland dimensional deviation in theextrusion molding of PVC trunking， industrial profile extrusion was taken as the research object.Through the reverse extrusion simulation method based on Polyflow software，the influence mechanisms of viscosity，extrusion rate and die lengthon product qualitywere analyzed，and technical measures such asusing the power-law constitutive model to describe melt rheological behavior，adaptive mesh remeshing to ensure numerical stability，and“swell pre-compensation”die geometry inversion were proposed.The research results show that high viscosity and high rate significantly aggravate dieswell with an increase of 22% and 18% respectively，and increasing the die length to 3O mm can reduce the swell ratio by 25% ： Reverse simulation effectivelyofsetselasticrecoveryand thermal shrinkage bypre-shrinking thedieprofile（wal thickness 1.3 mm vs product 1.5mm ），realizing high-fidelity molding of the cross-section.This method is not only applicable to PVC trunking，but also can be extended to the extrusion of biomedical microstructures such as PLA/ PCL，providing a mold design mode for the continuous manufacturing of high-precision medical devices.

Key words ：extrusion molding; PVC trunking; polyflow software ;reverse extrusion ; mold design

挤出成型作为塑料异型材制造的重要工艺，其制品质量高度依赖熔体流变行为和口模流道设计的匹配性。（剩余5748字）