HIPS在模具型腔中流变缺陷的形成机理分析  

Analysis of Formation Mechanism of Rheological Defects of HIPS in Mold Cavity

作　　者：胡邓平 高俊国[1] 伍先明[2] 陈立锋[2] Hu Dengping Gao Junguo Wu Xianming Chen Lifeng(Guangdong University of Science and Technology,Dongguan,Guangdong, 523083 Hunan Provincial Key Laboratory of High Efficiency and Precision Machining of Difficult-to-Cut Material,Hunan University of Science and Technology, Xiangtan, Hunan, 411201)

机构地区：[1]广东科技学院,广东东莞523083 [2]湖南科技大学难加工材料高效精密加工技术湖南省重点实验室,湖南湘潭411201

出　　处：《现代塑料加工应用》2017年第5期56-59,共4页Modern Plastics Processing and Applications

基　　金：广东科技学院大学生创新创业计划项目(1611002;1611012)

摘　　要：基于高抗冲聚苯乙烯(HIPS)塑料熔体在模具型腔中的流变特性,以空调框罩的注塑工艺为研究对象,对注射成型的工艺系统及HIPS材料特性进行了深入分析。针对保压及冷却过程中的温度场变化对缩痕形成进行建模分析。结果表明:熔体凝固层温度与模具型腔壁温度的温差越大,缩痕缺陷越大。同时又对热残余应力导致的缩痕进行了建模分析,得出即时降温速度和瞬时温度梯度越大,较大的应变速率将会导致更大的缩痕缺陷产生。并通过注射试验验证了空调框罩的成型工艺。Based on the rheological properties of high impact polystyrene plastic melt in the mold cavity, taking the injection molding process of air-conditioning frame as the object, injection molding process system and HIPS material characteristics of injection molding were analyzed in depth. The influence of the temperature field on the formation o{ the shrinkage marks during the pressure maintaining and cooling process was analyzed. The greater the difference between the melt solidification layer temperature and mold cav- ity wall temperature is, the greater the shrinkage defect is. And the shrinkage caused by the thermal residual stress was also analyzed. It is concluded that the greater instant cooling speed and the instantaneous temperature was, the larger strain rate will lead to greater shrinkage defects. And the molding process of air-conditioning frame was verified by injection molding experiment.

关 键 词：高抗冲聚苯乙烯 流变特性 注塑工艺 缩痕缺陷 温度场变化 热残余应力 

分 类 号：TQ325.2[化学工程—合成树脂塑料工业]