方管短玻璃纤维增强聚丙烯高压水穿透行为研究  

Study on high-pressure water penetration behavior of square cross-sectional pipes based on short-glass-fiber-reinforced polypropylene

作　　者：黄微 柳和生[1,2,3] 黄兴元 张伟[1] 匡唐清[3] 陈忠仕 HUANG Wei;LIU Hesheng;HUANG Xingyuan;ZHANG Wei;KUANG Tangqing;CHEN Zhongshi(Laboratory of Polymer Processing,Nanchang University,Nanchang 330031,China;Jiangxi Key Laboratory of Polymer Micro/Nano Manufacturing and Devices,East China University of Technology,Nanchang 330013,China;School of Mechanical&Electrical Engineering,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]南昌大学聚合物成型研究室,南昌330031 [2]东华理工大学江西省聚合物微/纳制造与器件重点实验室,南昌330013 [3]华东交通大学机电与车辆工程学院,南昌330013

出　　处：《中国塑料》2022年第2期82-88,共7页China Plastics

基　　金：江西省重点研发计划(20203BBE53065)。

摘　　要：采用方形截面管件,以短玻璃纤维增强聚丙烯为原料,通过溢流法水辅助注射成型实验探究了熔体注射温度、注水延迟时间和注水压力等工艺参数对制件宏观现象的影响机理,并分析了高压水在方形管道中的穿透行为。结果表明,当熔体温度升高时,方管的直角边和斜边残余壁厚都呈减小趋势,但温度过高时会出现管件收缩现象,管件截面中空面积增大且截面形状与高压水的穿透前沿形状一致,偏圆形,但截面的圆率逐渐减小;当注水压力增加时,管件残余壁厚减小,截面中空面积增大,其截面形状随着注水压力的增加逐渐与型腔结构一致,偏方形;当注水延迟时间增加时,管件残余壁厚增大,中空截面减小且管件截面形状也与高压水前穿透前沿一致,偏圆形,但相较另外两个参数,注水延迟时间对方管件的影响程度更小,因而对截面的圆率影响不大。A square cross-sectional pipe was injection-molded through an overflow water-assisted injection molding method using short-glass-fiber-reinforced polypropylene as a raw material.The effects of process parameters such as melt injection temperature,water injection delay time and water injection pressure on the macro phenomenon were investigated,and the penetration behavior of high-pressure water in the square pipe was analyzed.The results indicated that with an increase in melt injection temperature,the residual wall thickness of the right-angle side and the inclined side of the square tube tended to decrease.However,when the temperature was too high,the pipe tended to shrink,and the hollow area of the pipe section was increased.The shape of the cross section was consistent with the shape of the high-pressure water penetration front,presenting an ellipse shape.However,the roundness of the cross section decreased gradually.The residual wall thickness of the pipe decreased with an increase in water injection pressure,and the hollow area of the cross section increased.With an increase in the water injection pressure,the shape of the cross section was gradually consistent with the cavity structure,presenting a rectangle shape.When the injection delay time increased,the residual wall thickness of the pipe tended to increase,the hollow section became smaller,and the pipe section was consistent with the penetration front of high-pressure water,presenting an ellipse shape.Compared to the other two parameters,the injection delay time showed less influence on the square pipe,and there was little influence on the circumference ratio roundness of the cross-section.

关 键 词：方管 短玻璃纤维增强聚丙烯 水辅助注射成型 高压水穿透行为 

分 类 号：TQ320.66[化学工程—合成树脂塑料工业]