异形医用双腔导管挤出离模膨胀变形机理与调控

doi:10.19491/j.issn.1001-9278.2020.06.009

中国塑料 ›› 2020, Vol. 34 ›› Issue (6): 52-59.DOI: 10.19491/j.issn.1001-9278.2020.06.009

异形医用双腔导管挤出离模膨胀变形机理与调控

李福成, 周国发()

南昌大学资源环境与化工学院，南昌 330031

收稿日期:2019-12-23 出版日期:2020-06-26 发布日期:2020-06-26
基金资助:
国家自然科学基金(21464009)

Extrusion Die Swell Deformation Mechanism and Control of Medical Heteromorphosis Double⁃Cavitiy Catheter

Fucheng LI, Guofa ZHOU()

School of Resources, Environmental and Chemical Engineering, Nanchang University, Nanchang 330031, Jiangxi, China

Received:2019-12-23 Online:2020-06-26 Published:2020-06-26
Contact: Guofa ZHOU E-mail:ndzgf@163.com

摘要/Abstract

摘要：

如何准确预测和精密调控异形医用双腔导管的离模膨胀变形是实现其精密成型的关键技术。通过传统和气辅精密成型的对比分析，研究表明离模膨胀变形是由熔体的第二法向应力差驱动的径向二次流动所诱发，传统挤出成型会产生较大的第二法向应力差，第二法向应力差驱动诱发的径向二次流动是离模膨胀变形的直接驱动力，从而导致传统挤出成型的异形医用双腔导管不仅产生离模膨胀，而且还产生椭圆度误差，其最大离模膨胀比和椭圆度误差分别为1.86和6.3 %。异形医用双腔导管的气辅精密挤出成型基本可以消除熔体的第二法向应力差，必然消除了挤出成型过程的径向二次流动，从而实现了异形医用双腔导管的精密控形。

关键词: 异形, 医用, 双腔导管, 离模膨胀, 机理, 精密控型

Abstract:

The accurate prediction and precise control are two key technologies for the extrusion die swell deformation of medical heteromorphosis double?cavity catheter to realize the precision forming. A comparative analysis was performed for the traditional and gas?assisted precision extrusion forming. The results indicated that the extrusion die swell deformation was induced by the secondary flow driven by the second normal stress difference of the viscoelastic melt. On the other hand, a large second normal stress difference was generated during the traditional extrusion forming, and the secondary radial flow induced by the second normal stress difference was the direct driving force of the deformation caused by extrusion die swell. This led to the extrusion die swell and ellipticity error of the medical heteromorphosis double?cavity catheter obtained by traditional extrusion forming, and its maximum die swell ratio and ellipticity error were 1.86 and 6.3 %, respectively. The second normal stress difference of the viscoelastic melt could be basically eliminated by the gas assisted precision extrusion forming of the medical heteromorphosis double?cavity catheter, which eliminated the secondary flow in the extrusion process. Therefore, the high?precision shape control could be realized for the medical heteromorphosis double?cavity catheter.

Key words: heteromorphosis, medical part, double?cavity catheter, die swell, mechanism, precision shape control

中图分类号:

TQ 320.66⁺3

李福成, 周国发. 异形医用双腔导管挤出离模膨胀变形机理与调控[J]. 中国塑料, 2020, 34(6): 52-59.

Fucheng LI, Guofa ZHOU. Extrusion Die Swell Deformation Mechanism and Control of Medical Heteromorphosis Double⁃Cavitiy Catheter[J]. China Plastics, 2020, 34(6): 52-59.

图/表 23

图1 双腔异形口模实体与有限元模型

Fig.1 Solid model and finite element model

η₀/

Pa?s

λ/ s

η_r

ρ/

kg·m^-3

J·mol^-1

T₀/℃

表 1 熔体物性参数及 PTT模型参数

Tab.1 Material property and PTT model parameters

图2 松弛时间与离模膨胀形貌

Fig.2 Relaxation time vs. morphology of die swell

图3 进口体积流量与离模膨胀形貌

Fig.3 Melt inlet volumetric flow rate vs. morphology of die swell

图4 离模膨胀比与松弛时间

Fig.4 Die swell ratio vs. relaxation time

图5 离模膨胀比与熔体进口体积流量

Fig.5 Die swell ratio vs. inlet volumetric flow rate

图6 最大二次流动强度与松弛时间

Fig.6 Maximum secondary flow vs. relaxation time

图7 最大二次流动强度与熔体挤出体积流量

Fig.7 Maximum secondary flow vs. inlet volumetric flow rate

图8 松弛时间对位移沿经线分布影响

Fig.8 Influence of relaxation time on displacement distribution along the meridian

图9 体积流量对径向运动位移沿经线分布影响

Fig.9 Influence of inlet volumetric flow rate on displacement distribution along the meridian

图10 松弛时间对二次流动强度沿经线分布影响

Fig.10 Influence of relaxation time on secondary flow intensity distribution along the meridian

图11 体积流量对二次流动强度沿经线分布影响

Fig.11 Influence of inlet volumetric flow rate on secondary flow intensity distribution along the meridian

图12 松弛时间对第二法向应力差沿经线分布影响

Fig.12 Influence of relaxation time on second normal stress difference distribution along the meridian

图13 体积流量对第二法向应力差沿经线分布影响

Fig.13 Influence of inlet volumetric flow rate on second normal stress difference distribution along the meridian

图14 松弛时间对位移沿环向分布影响

Fig.14 Influence of relaxation time on the distribution of displacements along hoop direction

图15 体积流量对位移沿环向分布影响

Fig.15 Influence of inlet volumetric flow rate on the distribution of displacement along hoop direction

图16 松弛时间对二次流动强度沿环向分布规律影响

Fig.16 Influence of relaxation time on distribution of secondary flow intensity along hoop direction

图17 流量对二次流动强度沿环向分布规律影响

Fig.17 Influence of inlet volumetric flow rate on distribution of secondary flow intensity along hoop direction

图18 最大第二法向应力差与熔体松弛时间

Fig. 18 Second normal stress difference vs. relaxation time

图19 最大第二法向应力差与体积流量

Fig.19 Second normal stress difference vs. inlet volumetric flow rate

图20 传统与气辅成型第二法向应力差对比曲线

Fig.20 Comparison curve of the second normal stress difference between traditional and gas?assisted molding

图21 传统与气辅成型二次流动强度对比曲线

Fig.21 Comparison curve of secondary flow strength between traditional and gas?assisted molding

图22 气辅与传统挤出成型最终截面形状对比图

Fig. 22 Comparison of the final cross?sectional shape of gas?assisted and traditional extrusion molding

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异形医用双腔导管挤出离模膨胀变形机理与调控

Extrusion Die Swell Deformation Mechanism and Control of Medical Heteromorphosis Double⁃Cavitiy Catheter

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