基于Moldflow的汽车抽屉内板注塑模具设计  

Design of injection mould for automotive drawer inner panel based on Moldflow

作　　者：廖艳 袁博[2] 李广威 LIAO Yan;YUAN Bo;LI Guangwei(Tongji Zhejiang College,Jiaxing 314051,China;Wuhan City Polytechnic,Wuhan 430064,China;Hongshan District Science and Technology Achievement Transformation Promotion Center of Wuhan City,Wuhan 430070,China)

机构地区：[1]同济大学浙江学院,浙江嘉兴314051 [2]武汉城市职业学院,武汉430064 [3]武汉市洪山区科技成果转化促进中心,武汉430070

出　　处：《工程塑料应用》2024年第12期117-123,共7页Engineering Plastics Application

基　　金：武汉市市属高校产学研研究项目(CXY202219);湖北省教育厅科研计划项目(B2020427,B2019433);武汉城市职业学院科研创新团队建设计划资助项目(2020whcvcTD02)。

摘　　要：采用Moldflow软件对汽车抽屉内板的模流过程进行深入分析和优化,依据模拟分析的详尽结果与塑料件独特的结构特性,设计了1点开放式热流道浇注系统方案,预测了在塑件注射成型过程中可能遇到的问题,最后设计出一模一腔的热流道注塑模具。为了克服注射成型后塑件筋位对滑块产生过强包紧力导致的脱模难题,设计了一种滑块内置顶针复合抽芯机构,该机构融合了“滑块+顶针+弹簧+滑动块”的多元组件,通过实施两次分步抽芯策略,有效防止了塑件被滑块粘住。导向定位系统通过运用“导柱导套+定模板定位”的策略,实现了模具在开启与闭合过程中的精确无误及可靠复位功能。为了高效驱动并复位顶出机构,采用了“顶辊+氮气弹簧”的组合方式,与采用液压油缸方式相比,顶出复位时间降低约25%。设计了一种近似“随形水路”的冷却系统,形成了一个立体且密集的三维网格状冷却网络,增强了冷却效果,成型周期缩短约8%。模具投入生产后,运行表现稳定可靠,所生产的塑件质量完全达到既定标准,这为同类结构塑件的模具设计提供了参考。Moldflow software was used to deeply analyze and optimize the mold flow process of the inner panel of the automotive drawer.According to the detailed results of the simulation analysis and the unique structural characteristics of the plastic parts,a one-point open hot runner gating system was designed,and the problems that might be encountered in the injection molding process of the plastic parts were predicted.Finally,a hot runner injection mould with one mould and one cavity was designed.In order to overcome the demoulding problem caused by excessive clamping force on the slider due to the reinforcement position of the plastic part after injection molding,a composite core pulling mechanism with a built-in ejector pin in the slider was designed.This mechanism integrated multiple components of"slider+ejector pin+spring+sliding block".By implementing a two-step core pulling strategy,it effectively prevented the plastic part from being stuck by the slider.The guidance positioning system achieved precise and reliable reset function of the mould during the opening and closing process by using the strategy of"guide pillar guide sleeve+fixed mould positioning".In order to efficiently drive and reset the ejection mechanism,a combination of"top roller+gas spring"was adopted,which reduced the ejection reset time by about 25%compared to using hydraulic cylinders.A cooling system that approximates a"conformal waterway"was designed,forming a three-dimensional and dense grid-like cooling network that enhances the cooling effect and shortens the molding cycle by about 8%.After the mould is put into production,its operation performance is stable and reliable,and the quality of the produced plastic parts fully meets the established standards.This provides a reference for the design of moulds for similar structural plastic parts.

关 键 词：汽车抽屉内板 滑块内置顶针 模流分析 热流道系统 

分 类 号：TQ330.41[化学工程—橡胶工业]