Numerical simulation of water penetration in water-assisted injection molding

doi:10.3969/j.issn.0438-1157.2013.04.006

CIESC Journal ›› 2013, Vol. 64 ›› Issue (4): 1170-1175.DOI: 10.3969/j.issn.0438-1157.2013.04.006

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Numerical simulation of water penetration in water-assisted injection molding

WANG Zhiyong, HUANG Hanxiong, WANG Bin

Center for Polymer Processing Equipment and Intellectualization, South China University of Technology, Guangzhou 510640, Guangdong, China

Received:2012-07-24 Revised:2012-11-15 Online:2013-04-05 Published:2013-04-05
Supported by:
supported by the National Natural Science Foundation of China (20874031).

水辅助注塑中高压水穿透过程的数值模拟

汪志泳, 黄汉雄, 汪斌

华南理工大学塑料橡胶装备及智能化中心,广东广州 510640

通讯作者: 黄汉雄
作者简介:汪志泳(1987—),男,硕士研究生。
基金资助:
国家自然科学基金项目(20874031)。

Abstract

Abstract: The process of high-pressure water penetration in water-assisted injection molding (WAIM) was simulated based on the volume of fluid method, and the filling behavior of polymer melt as well as the elongation and shear fields were studied and analyzed.The simulated results showed that the process of melt filling propelled by high-pressure water was divided into three stages, namely, initial filling, fast filling, and terminal filling stages.Remarkable elongational rate was only present in the regions near both water and melt fronts.Widely-distributed and high shear rate was present in the region near the water front, whereas water had little shear effect on the melt in the water-penetrated zone.The simulated penetration length and hollow rate of the WAIM part matched well with the experimentally determined ones.

Key words: polymer, water-assisted injection molding, numerical simulation, penetration behavior, flow field

摘要： 对水辅助注塑(WAIM)中高压水的穿透过程进行有限元模拟,研究熔体的充模行为,并分析其拉伸场和剪切场。结果显示,高压水推动熔体充模的过程可分为填充初期、快速填充期和填充末期3个阶段;较明显的拉伸应变速率仅出现在高压水前沿和熔体前沿区域;高压水前沿区域存在分布较宽且较为强烈的剪切速率,而高压水对已穿透区域的熔体几乎没有剪切作用。此外,模拟所得WAIM制品的穿透长度和掏空率与实验结果较吻合。

关键词: 聚合物, 水辅助注塑, 数值模拟, 穿透行为, 流场

CLC Number:

TQ320.66

WANG Zhiyong, HUANG Hanxiong, WANG Bin. Numerical simulation of water penetration in water-assisted injection molding[J]. CIESC Journal, 2013, 64(4): 1170-1175.

汪志泳, 黄汉雄, 汪斌. 水辅助注塑中高压水穿透过程的数值模拟[J]. 化工学报, 2013, 64(4): 1170-1175.

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Numerical simulation of water penetration in water-assisted injection molding

水辅助注塑中高压水穿透过程的数值模拟

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