文献类型：期刊文献

中文题名：无定型段包覆挤出成型的非等温数值模拟

英文题名：Non-Isothermal Numerical Simulation of Amorphous Segment Coating Extrusion

作者：何优[1];刘焕牢[1];王宇林[1];胡伟康[1]

机构：[1]广东海洋大学机械工程学院广东省小家电创新设计及制造工程技术研究中心,广东湛江524088

年份：2025

卷号：41

期号：8

起止页码：84

中文期刊名：高分子材料科学与工程

外文期刊名：Polymer Materials Science & Engineering

收录：北大核心2023、、北大核心

基金：国家自然科学基金资助项目(52175458);广东省普通高校重点领域专项(2022ZDZX3006);广东省科技厅高新技术专题(2021A05186)。

语种：中文

中文关键词：包覆挤出;非等温;无定型段;管材拖动速度;入口流率;口模温度

外文关键词：wire coating extrusion;non-isothermal;without shaping section;drag speed of wire;inlet flow rate;die temperature

中文摘要：实际生产中对医用薄壁管材进行包覆时,包覆层壁薄要求使得芯棒和口模形成的平直段流道的截面间隙面积小,导致材料熔体在定型段处压力过大、模具压力高、材料熔体反流,直接影响到包覆层的成型质量。针对上述问题,文中运用Polyflow分别对设置与不设置定型段的包覆模型进行非等温数值模拟。首先对2种模型的速度场和压力场进行分析,探究了不设置定型段对挤出胀大的影响,然后分析了不设置定型段的包覆模型在不同牵引速度、入口流率和口模温度对包覆层尺寸及包覆流场稳定性的影响,并与设置定型段流道的包覆挤出过程进行对比。结果表明,随着工艺参数变化,2种模型的包覆层尺寸和包覆挤出流场均匀性的相关变化规律基本一致;定型段的设置不能消除包覆挤出中的挤出胀大;相对于有定型段的包覆挤出,无定型段包覆挤出能降低口模压降、减少能量消耗、提高包覆质量。

外文摘要：ABSRACT: When the medical thin-wall tube was coated in actual production, the coating layer was required to be thin-wall, which made the cross-section gap area of the straight section flow channel formed by the internal plug and the die small, resulting in excessive pressure of the polymer melt at the shaping section, high die pressure and material melt reflux, all of which directly affected the forming quality of the coating layer. To solve the above problems, the non-isothermal numerical simulation of the coating model with and without the shaping section was conducted by Polyflow. Firstly, the velocity field and pressure field of the two models were analyzed to explore the influence of the non-setting section on the die swell. Subsequently, the impact of the coating model without shaping section on the size of the coating layer and the stability of the coating flow field at varying drag speeds of the wire, inlet flow rates and die temperatures were analyzed, and the coating extrusion process was compared with that of the flow channel with the shaping section. The results indicate that.with the variation of process parameters, the correlated variation patterns of the coating layer dimensions and the uniformity of the coating extrusion flow field are fundamentally consistent between the two models. Die swell cannot be eliminated by setting of the shaping section. In comparison to the conventional coating extrusion, the die pressure drop and energy consumption can be decreased and the coating quality can be enhanced by the coating extrusion without shaping section.