方管短玻纤增强聚合物水辅注射成型穿透模拟及实验  

Penetration Simulation and Experiment of Water-Assisted Injection Molding of Square Tube Short Glass Fiber Reinforced Polymer

作　　者：陈忠仕 柳和生[1,2] 余忠[1,3] 章凯[3] 张伟[1] CHEN Zhong-shi;LIU He-sheng;YU Zhong;ZHANG Kai;ZHANG Wei(Polymer Processing Research Laboratory,Nanchang University,Nanchang 330031,China;School of Chemical Biology and Materials,East China University of Science and Technology,Nanchang 330013,China;Jiangxi Province Key Laboratory of Polymer Preparation and Processing,Shangrao Normal University,Shangrao 334001,China)

机构地区：[1]南昌大学聚合物成型研究室,江西南昌330031 [2]东华理工大学化学生物与材料学院,江西南昌330013 [3]上饶师范学院江西省塑料制备成型重点实验室,江西上饶334001

出　　处：《塑料工业》2019年第5期62-66,共5页China Plastics Industry

基　　金：国家自然科学基金项目(21664002);国家自然科学基金项目(51563010);江西省教育厅科技项目(GJJ161049);江西省研究生创新专项资金项目(YC2017-S058)

摘　　要：制件的穿透过程一直是水辅助注塑成型(WAIM)研究的热点。基于描述聚合物复合材料的黏弹性方程White-Metzner及流体动力学三大控制方程,采用有限体积法(FVM)开发的软件对由直线构成的方形截面管材短玻璃纤维增强聚合物水辅注射成型的穿透行为进行了数值模拟分析,并通过实验进行验证。分析中主要考虑工艺参数(熔体温度、注水压力、熔体注射量、纤维含量和注水延迟时间)及不同成型方法对制件性能的影响规律。结果表明,熔体温度和注水压力的增加会使制件的中空率增大,而随着延迟时间和注射量的增大,中空率减小;其他工艺参数不变,玻璃纤维含量越高中空率越小,这些现象进一步印证了前人的实验结果。溢流法成型制件的穿透截面形状趋于圆形,玻纤含量越高,圆率越大;短射法成型制件的穿透截面形状趋于型腔截面,且注射量和玻纤含量越高,穿透截面形状越偏离型腔截面;实验结果与模拟相符。The penetration process of workpiece had always been the focus of water-assisted injection molding( WAIM) research. Based on the viscoelastic equation White-Metzner and the three-control equations for fluid dynamics of description of polymer composites,the penetration behavior of water-assisted injection molding of short glass fiber reinforced polymer with square section pipe composed of straight lines was numerically simulated using software developed by the finite volume method( FVM), and verified by experiments. The analysis mainly considered the process parameters( melt temperature, water injection pressure,melt injection amount,fiber content and water injection delay time) and the influence of different molding methods on the performance of the parts. The results show that the increase of melt temperature and water injection pressure could increase the hollow rate of the parts. As the increase of delay time and injection volume,the hollow ratio will decrease. When the other process parameters remain unchanged,the hollow rate would decrease with the increase of the glass fiber contents. And these phenomena further confirm the experimental results of the predecessors. The shape of the penetration cross-section of the overflow molded parts tends to be circular,and the higher of the glass fiber content,the greater the round rate could achieve.The penetration cross-section shape of the short-shot molded parts tends to be the cavity section. And as the increase of the glass fiber content and injection volume,the shape of the penetration section could deviate from the cavity section. The experimental results are consistent with the simulation.

关 键 词：方形截面 短玻璃纤维增强聚合物 水辅助注塑 穿透行为 数值模拟 

分 类 号：TQ320.66[化学工程—合成树脂塑料工业]