摘要
采用3D模拟技术和各项异性旋转扩散-诱导应变闭合(ARD-RSC)等模型以及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中玻纤增强聚丙烯(GFRPP)熔体在流道中的纤维取向、温度和流动速度偏移现象进行模拟和分析。结果表明,低速注射时,GFRPP熔体中纤维取向明显,流道表层区域的纤维取向程度大于芯层区域的纤维取向,存在着明显的、不对称的表层-芯层-表层结构,纤维取向加剧了塑料熔体前沿温度与流动速度的向下偏移。高速注射时,纤维取向仍然存在不对称的表层-芯层-表层结构,但比低速注射时不明显得多,纤维取向对熔体前沿高温区和流动速度向下侧偏移幅度的影响也较低速注射时更大。即GFRPP熔体在不同注射速度下熔体的流动速度、流动状态、温度变化相互作用与影响,使得熔体的纤维取向,流动速度、温度分布产生偏移,导致流道系统和型腔充型不均衡。
Three-dimensional(3-d)simulation technology,an anisotropic rotary diffusion-reduced strain closure(ARD-RSC)model,and a temperature measuring system equipped with integrated thermocouple sensors,and visual holographic tracer technique were used.On this basis,the fibre orientation and deviations of the temperature and flow velocity distributions of glass fibre reinforced polypropylene(GFRPP)melts in the runners during multi-cavity micro-injection moulding were simulated and analyzed.The results show that at a low injection rate,GFRPP melts present a significant fibre orientation;the degree of fibre orientation in the surface area is greater than that in the core of the runners,forming an asymmetric surface-core-surface structure.The fibre orientation aggravates the downward deviation of the temperature and flow velocity distributions of the GFRPP melt flow fronts.At a high injection rate,an asymmetric surface-core-surface structure persists due to the fibre orientation;however,the structure is less significant than that formed at a low injection rate.The effects of the fibre orientation on the downward deviation amplitude of the high-temperature zone and flow velocity distribution of the melt flow fronts are greater than that at a low injection rate.This means that the changes of the flow velocity,flow state,and temperature of GFRPP melts interact at different injection rates,which causes the fibre orientation of the melts to appear and their flow velocity and temperature distributions to deviate.As a result,it leads to unbalanced filling in the runner system and cavities.
作者
郭幼丹
吴春笃
Youdan Guo;Chundu Wu(School of Marine Equipment and Mechamical Engineering,Jimei University,Xiamen 361021,China;School of Environmental and Safety Engineering,Jiangsu University,Zhenjiang 212013,China)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2021年第7期95-102,108,共9页
Polymer Materials Science & Engineering
基金
福建省教育厅科技计划(JA12197)
福建省科技计划引导性(重点)项目(2016H0023)。
关键词
纤维取向
偏移行为
多腔微注塑成型
玻纤增强聚丙烯
fibre orientation
flow deviation
multi-cavity micro-injection moulding
glass fibre reinforced polypropylene
