多筋梳形件气辅成型气指缺陷模拟与控制研究  

Research on Simulation and Control of Gas Fingering Defect in Gas-assisted Injection Molding of Multi-rib Comb Shaped Part

作　　者：沈祖炎 王子秦 夏琴香[2] 肖刚锋[2] 程秀全[3] SHEN Zu-yan;WANG Zi-qin;XIA Qin-xiang;XIAO Gang-feng;CHENG Xiu-quan(China Wonderland Nursery Goods Co.,Ltd.,Dongguan,523648,China;School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,China;Aircraft Maintenance Engineering College,Guangzhou Civil Aviation College,Guangzhou 510403,China)

机构地区：[1]明门(中国)幼童用品有限公司,东莞523648 [2]华南理工大学机械与汽车工程学院,广州510640 [3]广州民航职业技术学院飞机维修工程学院,广州510403

出　　处：《高分子通报》2024年第3期345-357,共13页Polymer Bulletin

基　　金：广东省重点领域研发计划项目“模具及装备制造业智能制造系统集成技术研究与示范应用”(项目号2019B090918004)。

摘　　要：多筋梳形件具有多加强筋及中空的复杂结构,传统注射成型难以获得良好的成型效果,故通常采用气辅成型作为制造工艺。然而,复杂结构下的气辅成型将产生气指缺陷,严重制约零件成型质量。以某多筋梳形件小腿靠为研究对象,针对零件气指缺陷,基于对产品的结构设计和成型技术方法的分析,对气指缺陷的形成原因进行了理论分析;基于Moldflow软件建立了小腿靠有限元模型,对气指形成进行有限元分析;基于薄化壁厚原则,改进了主体壁厚和加强筋壁厚,并提出了火山口减胶方案。结果表明,随着主体壁厚和加强筋壁厚的减少,气指缺陷得到改善。采用火山口减胶方案可在消除气指缺陷的基础上避免大面积减薄。试模验证了局部减薄可加快零件冷却,形成有效冻结层,从而消除气指缺陷。Multi-rib comb shaped parts have a complex structure with multiple ribs and hollow cavities,and traditional injection molding is difficult to achieve good molding results.Therefore,gas-assisted injection molding is usually used as the manufacturing process.However,gas assisted forming under complex structures will produce gas finger defects,seriously restricting the quality of part forming.Taking the calf support of a multi-rib comb shaped part as the research object,aiming at the gas finger defect of the part,based on the analysis of the structural design of the product and the molding technology,the formation mechanism of gas finger defect was analyzed theoretically.Based on Moldflow software,the finite element model of calf support was established to analyze the formation mechanism of gas finger.Based on the principle of thinning wall thickness,the wall thickness of the main body and the wall thickness of ribs were improved,and the scheme of reducing glue in the crater was proposed.The results show that with the thickness of the main body and the wall thickness of ribs decrease,the gas fingering is improved.The use of volcanic crater glue reduction scheme can avoid large-scale thinning while eliminating gas fingering defects.The test mold has verified that local thinning can accelerate the cooling of parts,form an effective freezing layer,and thus eliminate gas fingering defects.

关 键 词：多筋梳形件 气体辅助注射成型 气指缺陷 气指量化分析 缺陷控制 

分 类 号：TQ320.662[化学工程—合成树脂塑料工业]