矿用无线采集仪外壳双色注塑模具设计  

Design of two-color injection mould of mine wireless acquisition instrument shell

作　　者：黄继战[1,2] 范玉 肖根先[1] HUANG Jizhan;FAN Yu;XIAO Genxian(School of Intelligent Manufacturing,Jiangsu Vocational Institute of Architectural Technology,Xuzhou 221116,China;Engineering Research Center of Xuzhou Mould New Technology,Xuzhou 221116,China)

机构地区：[1]江苏建筑职业技术学院智能制造学院,江苏徐州221116 [2]徐州市模具新技术工程研究中心,江苏徐州221116

出　　处：《工程塑料应用》2024年第12期110-116,143,共8页Engineering Plastics Application

摘　　要：在分析某矿用无线采集仪外壳工艺性能的基础上,采用分体式结构和一模两腔布局,设计了一副定模滑块抽芯的三板式双色模具。为实现此产品的先后两次注射成型,设计了两组不同结构的型腔和两组相同结构的型芯;针对该产品部分外表面位于动模型腔的设计难题,采用定模抽芯的方法将前壳类圆锥外表面的下半部分转为定模型腔成型,设计了定模“弯销+滑块”抽芯结构;针对前壳的型芯较高且根部存在窄缝的情况,将此型芯设计成镶件,节省了高价材料且便于加工。两次注射成型的浇注系统均采用单一点浇口进料的点浇口浇注系统,并利用软件Moldflow2021分析确定了合适浇口的位置,验证了浇注系统设计的合理性,进而可减少修模次数。针对该产品内螺纹倒扣的设计难点,将螺纹型芯设计成活动镶件,即在定模滑块和螺纹型芯内部加工带凸起的六方通孔,用销钉将带凹槽的六方轴固定于滑块,螺纹型芯可通过六方孔套入或抽出六方轴,由此简化了模具结构。该模具已投入生产,其运行顺畅、平稳,生产的双色产品质量良好。On the basis of analyzing the technological performances of mine wireless acquisition instrument shell,the split structure and the one mould with two cavities were adopted,and a set of three plate type two-color mould with core pulling of fixed mould slider was designed.To achieve the two injection molding of this product,two sets of cavities with different structures and two sets of cores with the same structure were designed.In response to the design problem of the outer surface of the product being located in the moving mould cavity,the lower half of the conical outer surface of the front shell was transformed into fixed mould cavity molding using the fixed mould core pulling method.The fixed mould“slider+angular cam”core pulling structures were designed.According to the situation where the core of the front shell was high and there was a narrow gap at the root,this core was designed as an insert to save expensive materials and facilitate processing.Pin-point gate gating systems with single pin-point gate feeding were used in the gating system for both injection molding,and the appropriate gate position was determined through analysis by Moldflow2021,verifying the rationality of the gating system design and reducing the number of mould repairs.In response to the design difficulty of the product's internal thread reverse buckle,the threaded core was designed as a movable insert,which is to process a hexagonal through-hole with protrusions inside the fixed mould slider and the threaded core,and fix the hexagonal shaft with grooves to the slider with a pin,then the threaded core could be inserted into or extracted from the hexagonal shaft through the hexagonal hole to simplify the mould structure.The mould has been put into production and runs smoothly and steadily,producing high-quality two-color products.

关 键 词：外壳 双色注塑模具 一模两腔 点浇口 抽芯机构 螺纹型芯 

分 类 号：TQ320.52[化学工程—合成树脂塑料工业]