摘要
为了改变制品翘曲变形程度,文章采用时序进胶注塑成型技术。通过时序控制系统控制针阀式喷嘴阀门的动作实现顺序供料,改变熔体前锋交合的状态,使注塑过程中各浇口流出的熔体逐步推进。在喷嘴阀门的时间控制方面利用Modflow软件进行了大量模拟分析,先设置第一浇口与第二浇口,填充阶段,当熔体前沿达到第二个浇口位置时,关闭第一浇口一个时间段再打开第二浇口浇注能够改善玻纤分子排列的一致性。通过顺序控制翘曲-时间曲线,直观反映喷嘴阀门的最佳控制时间。结果表明:时序进胶注塑成型技术可较好解决传统生产工艺中存在的扰乱玻纤分子取向的问题,可以得到玻纤取向一致的效果,从而将制品的翘曲控制在规定范围内。
In order to change the warping degree of products,the time sequence injection molding technology is adopted in this paper.Sequential feeding can be realized by controlling the action of the needle nozzle valve through a time sequence control system,and the state of melt front intersection can be changed,so that the melt flowing out of each gate in the injection molding process can be gradually advanced.Modflow software is used to simulate the time control of the nozzle valve.First,the first gate and the second gate are set.In the filling stage,when the melt front reaches the second gate position,closing the first gate for a period of time and then opening the second gate can improve the consistency of glass fiber molecular arrangement.Through sequential control of the warp-time curve,the best control time of nozzle valve is intuitively reflected.The results show that the time sequence injection molding technology can solve the problem of disturbing the orientation of glass fiber molecules in the traditional production process,and can get the effect of uniform orientation of glass fiber,thus controlling the warpage of products within the specified range.
作者
周大路
匡唐清
黄薇
ZHOU Da-lu;KUANG Tang-qing;HUANG Wei(Engineering Training Center,East China Jiaotong University,Nanchang 330013,China)
出处
《塑料科技》
CAS
北大核心
2024年第1期93-97,共5页
Plastics Science and Technology
基金
江西省自然科学基金重点项目(20232ACB204004)。
