微注塑成型过程塑料熔体流动的偏移行为

doi:10.11949/j.issn.0438-1157.20141214

化工学报 ›› 2015, Vol. 66 ›› Issue (6): 2329-2335.DOI: 10.11949/j.issn.0438-1157.20141214

• 材料化学工程与纳米技术 • 上一篇下一篇

微注塑成型过程塑料熔体流动的偏移行为

郭幼丹¹, 程晓农²

1. 集美大学机械与能源工程学院, 福建厦门 361021;
2. 江苏大学材料科学与工程学院, 江苏镇江 212013

收稿日期:2014-08-11 修回日期:2014-12-25 出版日期:2015-06-05 发布日期:2015-03-25
通讯作者: 郭幼丹
基金资助:
国家自然科学基金项目(50772044);福建省自然科学基金项目(2014J01200);福建省教育厅科技计划项目(JA12197)。

Flowing deviation behavior of plastic melt during micro injection molding process

GUO Youdan¹, CHENG Xiaonong²

1. College of Mechanical and Energy Engineering, Jimei University, Xiamen 361021, Fujian, China;
2. College of Materiai Science and Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, china

Received:2014-08-11 Revised:2014-12-25 Online:2015-06-05 Published:2015-03-25
Supported by:
supported by the National Natural Science Foundation of China(50772044) and the Natural Science Foundation of Fujian Province(2014J01200).

摘要/Abstract

摘要：

采用集成式热电偶传感器温度测量系统和可视化全息示踪技术, 对多型腔微注塑成型过程熔体流动前沿在型腔内的偏移现象进行观察和分析。结果表明, 当注射速度为140~220 mm·s^-1时, 主流道内的塑料熔体前沿呈“U型流”状态分布, 分流道内塑料熔体前沿向上侧偏移;当注射速度为10~70 mm·s^-1时, 主流道塑料熔体前沿呈“喷泉流”状态分布, 分流道熔体前沿向下侧偏移;当注射速度为80~120 mm·s^-1时, 主流道和分流道熔体前沿均没有明显的偏移。说明微注塑时注射速度不同, 产生的剪切热也不同, 熔体前沿偏移情况也不同。为此, 引入非平衡流动系数λ, 来判断熔体前沿的流动和偏移情况。

关键词: 熔体, 偏移, 注射速度, 微注塑

Abstract:

The migration phenomenon of the melt flow front of multi-cavity micro injection molding process within the cavity is observed and analyzed using temperature measuring system equipped of integration of thermocouple sensor and visualization holographic tracer technique. The experimental results show that in the injection rate of 140-220 mm·s^-1, the plastic melt front in the main runner is“U flow state”, while it is upper offset within secondary runner; in the injection rate of 10-70 mm·s^-1, the plastic melt front in the main runner is“fountain” flow state, while it is down offset within secondary runner; and in the injection rate of 80-120 mm·s^-1, the plastic melt fronts within both main and secondary runners have no obvious offset. The results indicate that the injection speed is different during the micro injection molding, leading to various shear heat and also melt front offset. Therefore, a nonequilibrium flow coefficient λ is introduced to determine the flow of the melt front and offset.

Key words: melt, offset, injection rate, micro injection

中图分类号:

TQ320

郭幼丹, 程晓农. 微注塑成型过程塑料熔体流动的偏移行为[J]. 化工学报, 2015, 66(6): 2329-2335.

GUO Youdan, CHENG Xiaonong. Flowing deviation behavior of plastic melt during micro injection molding process[J]. CIESC Journal, 2015, 66(6): 2329-2335.

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微注塑成型过程塑料熔体流动的偏移行为

Flowing deviation behavior of plastic melt during micro injection molding process

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