小微注射成型模内熔体流变行为的原位监测方法及影响因素  

In-situ monitoring method and influencing factors of in-mould melt rheological behavior in fine/micro injection molding

作　　者：赵南阳 金胜祥 吴琼 许忠斌[1,3] ZHAO Nanyang;JIN Shengxiang;WU Qiong;XU Zhongbin(College of Energy Engineering,Zhejiang University,Hangzhou 310027,China;R&D Center,Beilong Precision Technology Company Limited,Yuyao 315400,China;Zhejiang Provincial Engineering Center of Integrated Manufacturing Technology and Intelligent Equipment,Hangzhou City University,Hangzhou 310015,China)

机构地区：[1]浙江大学能源工程学院,杭州310027 [2]贝隆精密科技股份有限公司设计研发部,浙江余姚315400 [3]浙大城市学院材料成型集成技术与智造装备浙江省工程研究中心,杭州310015

出　　处：《工程塑料应用》2024年第12期66-72,共7页Engineering Plastics Application

基　　金：浙江省高层次人才特殊支持计划(No.2023R5218);余姚市重点研发计划暨“揭榜挂帅”项目(No.2023JH03010002)。

摘　　要：现有基于注塑机塑化单元的监测方法难以应用于模内熔体状态精确分析,尤其模内的流变监测手段受狭缝细微结构局限,存在实施困难和破坏制品表面质量的问题。提出一种利用注射成型模内细微流道本身结构特点开展熔体黏度原位监测的方法。通过在模内流道中布置测量模块,并集成可替换镶块结构,实现聚合物熔体加工流变性能的在线测量。研究了模内测量通道尺寸效应在不同工艺参数和通道结构下的变化规律,考察了塑化温度、注射压力和模具温度对熔融聚合物流动的影响。结果表明,随着通道内径的减小,测量通道的尺寸效应增大;而随着注射速率的增加和塑化温度的减小,尺寸效应也随之增大。监测得到的模内熔体黏度主要受塑化温度影响,受注射压力和模具温度的影响较小。模内熔体黏度原位监测方法有效表征了注射成型复杂细微结构模具内部的熔体状态,并且避免了模内监测元件布局对制品表面质量的影响。该方法拓展了模内加工流变学监测分析手段,为注射成型精密微结构制品质量调控提供了借鉴。Existing monitoring methods based on the plasticizing unit of injection molding machines are difficult to apply accurately to analyze the melt state within the mould.Additionally,in-mould rheological monitoring techniques are limited by narrow gap fine structures,leading to insufficient applicability and potential damage to the surface aesthetics of the product.To address these issues,a method for in-situ monitoring of melt viscosity using the in-mould fine channel structure characteristics in injection molding was proposed.Online measurement of the rheology of polymer melt processing was realized with arrangement measurement modules within the mold flow channel and the integration of replaceable insert structures.The change rules of the size effects of the in-mould measurement channels under different process parameters and channel structures were specifically investigated,as well as the impact of plasticizing temperature,injection pressure,and mould temperature on the flow state of molten polymers.The results indicate that the size effect of the measurement channel increases with the reduction of the diameter of the channel.The size effect rises with the increase of injection velocity and decrease of plasticizing temperature.The polymer melt’s viscosity in mould is mainly affected by the plasticizing temperature,while the influences of injection pressure and mould temperature on the viscosity of the melt are limited.The proposed in-situ monitoring method for in-mould melt viscosity successfully characterizes the melt state inside complex fine moulds in injection molding,and the layout design of measurement modules in the mold flow channel does not affect the surface quality of the products.This method expands the monitoring techniques of in-mould processing rheology and provides reference for quality control development in injection-molded precision fine/micro structure products.

关 键 词：注射成型 模内监测 加工流变学 聚合物 黏度 

分 类 号：TQ320[化学工程—合成树脂塑料工业]