微尺度下H形分布流道充模工艺参数对流动不平衡的影响分析

doi:10.19491/j.issn.1001-9278.2022.01.015

中国塑料 ›› 2022, Vol. 36 ›› Issue (1): 100-106.DOI: 10.19491/j.issn.1001-9278.2022.01.015

微尺度下H形分布流道充模工艺参数对流动不平衡的影响分析

杨波, 徐斌(), 杨朝龙

西南科技大学制造过程测试术教育部重点实验室，四川绵阳 621010

收稿日期:2021-07-08 出版日期:2022-01-26 发布日期:2022-01-21
基金资助:
国家自然科学基金(51475395)

Analysis of influence on process parameters of flow imbalance of H⁃shaped channel filling in microscale

YANG Bo, XU Bin(), YANG Chaolong

Key Laboratory of Testing Technology for Manufacturing Process of Ministry of Education，Southwest University of Science and Technology，Mianyang 621010，China

Received:2021-07-08 Online:2022-01-26 Published:2022-01-21
Contact: XU Bin E-mail:haroldexu@163.com

摘要/Abstract

摘要：

为探究微尺度下的工艺参数对聚合物熔体充填不平衡的影响，考虑模具温度、熔体温度、注射速率以及微流道尺寸，采用聚甲醛（POM），对H形对称分布的半圆形截面微流道系统进行了充模流动数值模拟实验，分析了浇口处对称点间的温差数据。结果表明，微注塑过程中流道系统内存在温度不对称，随着剪切速率的增加，对称点间的温度差也逐渐增加；而熔体入口温度越大，对称点间温度差异越大，充填不平衡越明显；微流道的尺寸越小，微尺度效应越弱，对称点间的温度差异越小，充填不平衡得到改善；升高模具温度，熔体与壁面间的对流换热量减少，能够降低对称点间温差，改善充填不平衡。

关键词: 模具温度, 熔体温度, 注射速率, 微流道尺寸, 充填不平衡

Abstract:

To explore the influence of the key factors on the imbalance of polymer melt filling at a micro scale， a numerical simulation experiment was conducted using polyoxymethylene as a raw material in a semi?circular H?shaped symmetrical distribution microchannel system with the consideration of the mold temperature， melt temperature， injection rate and microchannel size. The temperature difference data between the symmetrical points at the sprue was analyzed.The obtained results indicated that there was a temperature asymmetry in the flow channel system during the process of microinjection， and the temperature difference between the symmetrical points increased with an increase in injection rate. The larger the melt inlet temperature， the greater the temperature difference between the symmetry points， and the more obvious the filling imbalance. The smaller the microchannel size， the smaller the temperature difference between the symmetrical points. The filling imbalance was also improved. Increasing the mold temperature can reduce the convective heat transfer between the melt and the wall surface. This could reduce the temperature difference between the symmetrical points and improve the imbalance of filling.

Key words: mold temperature, melt temperature, injection rate, microchannel size, filling imbalance

中图分类号:

TQ320.66

杨波, 徐斌, 杨朝龙. 微尺度下H形分布流道充模工艺参数对流动不平衡的影响分析[J]. 中国塑料, 2022, 36(1): 100-106.

YANG Bo, XU Bin, YANG Chaolong. Analysis of influence on process parameters of flow imbalance of H⁃shaped channel filling in microscale[J]. China Plastics, 2022, 36(1): 100-106.

图/表 8

图1 POM材料的黏度与剪切速率的关系曲线

Fig.1 Relationship curves between viscosity and shear rate of POM material

材料	n	η₀/Pa·s	A₁/K	A₂/ K	T^*/K	λ	C_p/J·（kg·K）^-1	κ /W·（m·K）^-1	ρ /kg·m^-3
POM	0.24	27 360	1.69	51.6	409.15	0.111 9	2 952	0.21	1 158

表1 黏度模型系数及材料参数

Tab.1 Viscosity model coefficient and Material parameters

图2 整体流道系统布局及网格划分

Fig.2 Flow passage system layout and grid division

材料	熔体温度/K	注射速率/s^-1	模具温度/K
POM	500	5 000	393
	500	7 000	393
	510	9 000	403
	510	11 000	403
	520	13 000	413

表2 模拟实验工艺参数设置

Tab.2 The simulation experiment parameters are set horizontally

图3 流道系统整体与浇口截面温度分布

Fig.3 Temperature distribution of the whole runner system and the gate section

图4 熔体温度对对称点温差的影响

Fig.4 Influence of melt temperature on temperature difference at symmetry point

图5 流道尺寸对对称点温差的影响

Fig.5 Influence of runner size on temperature difference at symmetry point

图6 模具温度对对称点温差的影响

Fig.6 Influence of mold temperature on temperature difference at symmetry point

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微尺度下H形分布流道充模工艺参数对流动不平衡的影响分析

Analysis of influence on process parameters of flow imbalance of H⁃shaped channel filling in microscale

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