玩具罩壳多腔三板两次顶出热流道注塑模设计  

Design of Three Plates Hot Runner Injection Mold with Multi-cavity and Twice Ejection for Toy Cover

作　　者：周淑容[1] Zhou Shurong(Department of Mechanical Engineering,Sichuan Vocational and Technical College,Suining 629000,China)

机构地区：[1]四川职业技术学院机械工程系,四川遂宁629000

出　　处：《工程塑料应用》2021年第2期103-109,共7页Engineering Plastics Application

基　　金：四川省教育厅项目(15ZB0353)。

摘　　要：结合玩具罩壳塑件1模4腔注射成型的生产要求,设计了一副1模4腔三板注塑模具用于该塑件的生产。使用热流道和冷流道相结合的复合流道,克服了多腔浇注时因流道过长而产生的流道容易堵塞问题。根据玩具罩壳的特征,对塑件模腔进行分型并设计成型零件,简化了单个模腔结构,保证了单个模腔的4个外侧面都能设置1个侧抽芯机构。为保证模具自动化生产顺利进行,改装了普通三板模架结构,定模增设了热流道板,动模增设了二次顶出板,模架增加了3种开模动作辅助装置。模架的顶出机构改进为两次顶出机构,由圆顶针、方顶杆、大斜顶共同顶出完成塑件在型芯上的第一次脱模,由圆顶针、方顶杆的继续顶出完成塑件在大斜顶上的第二次脱模,保证了塑件的无损脱模。According to the requirements of injection production of one mold with four cavities for toy shell plastic parts,a set of three plate injection mold including one mold with four cavities was designed.The compound runner combining hot runner with cold runner was used to overcome the problem that the runner was easy to block due to too long runner in multi cavity gating.According to the characteristics of toy shell,the mold cavity of the plastic part was divided and the molding parts were designed.The structure of the single cavity was simplified,and ensured one side core pulling mechanism can be set on each side of the four outer sides of single mold cavity.In order to ensure the automation production of mold,the general three-plate moldbase structure was modified,the hot-runner-plate was added to the fixed-mold,the second ejectior-plate was added to the moving-mold,and three auxiliary devices for the mold opening action were added to the moldbase,the ejection mechanism of moldbase was improved to twice ejection mechanism.The first demoulding of the plastic part on the core was completed by the co-ejection of round ejector,rectangular ejector and large slanted ejector,and the second demoulding of the plastic part on the large slanted ejector was completed by the continuous ejection of round ejector and the rectangular ejector,which ensures the non-destructive demoulding of the plastic part.

关 键 词：多腔模具 设计改进 注射成型 结构设计 

分 类 号：TQ320.52[化学工程—合成树脂塑料工业]