水辅注塑成型注射方法对方管纤维取向和收缩性的影响  

Influence of Injection Method of Water-Assisted Injection Molding on Fiber Orientation and Shrinkage of Square Tubes

作　　者：陈忠仕 柳和生[1,2] 余忠[1,3] 章凯[3] 张伟[1] Zhongshi Chen;Hesheng Liu;Zhong Yu;Kai Zhang;Wei Zhang(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：《高分子材料科学与工程》2020年第2期112-119,共8页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(21664002,51563010);江西省教育厅科技项目(GJJ161049)。

摘　　要：基于聚合物复合材料黏弹性本构方程(White-Metzner方程)和流体动力学三大控制方程,采用改进的iARD-RPR纤维取向模型,以直线构成的方形截面管材为研究对象,运用有限体积法开发的软件,模拟分析了溢流法和短射法对制品纤维取向和收缩率的影响,且有相应实验验证。结果显示,2种注射方法的制件在竖切面(对边中心点连线处切面)上沿流动方向的纤维取向度从表层到水道层逐渐减小,且短射法制件竖切面后段纤维取向的有序区域比前段大;在对角切面(方形截面对角线切面)上,纤维取向度比对应的制件竖切面高;溢流法制件由于穿透截面形状趋于圆形,且壁厚相对较厚,4个直角处及整体收缩率较高,而短射法穿透截面形状趋于截面形状,制件冷却均匀,所以4个直角和整体的收缩率很低,随着注射量增加,收缩率增大。Based on the viscoelastic constitutive equation(which is White-Metzner equation) and the three-control equations for fluid dynamics of polymer composites, using the improved iARD-RPR fiber orientation model, the square section tubes composed of straight line were taken as research object. The software based on the finite volume method was used to simulate and analyze the effects of the overflow method and short shot method on the fiber orientation and shrinkage of the parts, and verified by some experiments. The results show that the orientation of the fibers along the flow direction on the vertical cutting surface(the cutting surface at the midpoint of the line from opposite sides) gradually decreases from the surface layer to the water channel layer, and the order area of fiber orientation on the rear section of the vertical cutting surface of the short shot method is larger than the front section;on the diagonal cutting surface(the diagonal section of square section), the fiber orientation is higher than the corresponding vertical cutting surface of the workpiece;the shape of the penetration cross-section of the overflow molded parts tends to be circular, and have a thinner wall thickness, the shrinkage rate of the four right angles and the overall is higher;while the penetration cross-section shape of the short-shot molded parts tends to the cavity section, the parts are cooled evenly, so the shrinkage rate of the four right angles and the overall is very low. As the injection volume increases, the shrinkage rate increases.

关 键 词：水辅注塑 注射方法 方形截面 纤维取向 收缩率 

分 类 号：TQ320.662[化学工程—合成树脂塑料工业]