不同截面型腔的气辅共注塑成型制件质量分析  

Quality Analysis of the Gas-Assisted Co-Injection Molding Process of Cavities with Different Cross-Section

作　　者：黄淑慧[1] 赵珠宇 林军 周凯 HUANG Shuhui;ZHAO Zhuyu;LIN Jun;ZHOU Kai(Department of Mechanical and Electrical Engineering,Jiangxi University of Science and Technology,Nanchang,Jiangxi 330013,China;Department of Jiangxi Maintenance Company,State Grid,Nanchang,Jiangxi 330096,China;School of Mechanical&Electrical Engineering,East China Jiaotong University,Nanchang,Jiangxi 330013,China)

机构地区：[1]江西理工大学能源与机械工程学院,江西南昌330013 [2]国网江西检修公司,江西南昌330096 [3]华东交通大学机电工程学院,江西南昌330013

出　　处：《塑料》2021年第6期129-134,共6页Plastics

基　　金：江西省教育厅基金(GJJ170530);江西省“十三五”教育规划资助项目(20YB086)。

摘　　要：基于自行开发的UDF模型进行溢流法GACIM数值模拟,研究了气体在5种截面型腔中,穿透芯层熔体的截面形状以及芯/壳层熔体残余壁厚分布情况。模拟发现,在相同成型工艺参数条件下,气体在不同截面型腔中穿透芯层熔体的截面形状不同,截面型腔外凸尖角越少,气体穿透芯层熔体的截面形状越接近圆形。芯/壳层熔体在非圆形截面型腔的外凸尖角处温度下降较快,以致外凸尖角处堆积的熔体较多,残余壁厚较厚。通过自行构建的流体辅助注塑实验平台进行溢流法GACIM实验,验证了模拟的准确性。此外,气体在推动熔体向前移动时,能够更好的适应型腔的多样性,使气体穿透熔体的截面形状易趋于型腔截面形状。试样总残余壁厚变化范围、最大总残余壁厚和最大芯层熔体残余壁厚均随着圆率的增大而减小;最小总残余壁厚和最小芯层熔体残余壁厚均随着圆率的增大而增大。Based on the UDF model by self-developed,a numerical simulation of gas assisted co-injection molding(GACIM)was carried out to study the cross-section shape of the gas penetrating core melt and the distribution of the core/shell residual wall thickness and material distribution in the five cross-section cavities with the same radius of the inscribed circle.The simulation results showed that the cross-section shape of the gas-penetrating core melt in different cross-section cavity was different,the less convex angles of the cross section cavities were,the cross-section shape of the gas-penetrating core melt was similar to a circle;The variation range of the temperature in the convex angles of the non-circular cross-section cavities was faster than other angles,So that the core/shell melt accumulated more melt at the outer convex angle,and the residual wall thickness was thicker.The accuracy of the simulation was verified by the experiment.Besides,when the gas penetrated the melt and moved the melt forward,the gas could better adapt to the diversity of the cavity.The products molded under the same technological parameters,it also showed that the melt cross section of the core layer was close to that of the cavity and the melt cross section of the gas through the core layer was close to that of the cavity with the increase of the circular rate.The variation range of the total residual wall thickness was decreased with the increase of the circular ratio.Both the minimum total residual wall thickness and the minimum core melt residual wall thickness was increased with the increase of the circular ratio.The maximum total residual wall thickness and the maximum core melt residual wall thickness was decreased with the increase of the circular ratio.

关 键 词：聚合物加工 气辅共注塑 穿透 截面 质量 

分 类 号：TQ320.66[化学工程—合成树脂塑料工业]