玻纤改性聚甲醛滚焊机控制器支架注射模设计  

Design of Injection Mold for POM Controller Bracket Based on Glass Fiber Modification

作　　者：刘红燕 贺玉强 魏茂强 Liu Hongyan;He Yuqiang;Wei Maoqiang(Human Financial Industrial Vocational-technical College,Hengyang 421002,China;Hengyang Hualing Continuous Rolling Pipe Co.,Ltd.,Hengyang 421001,China;Zibo City Product Quality Inspection and Research Institute,Zibo 255000,China)

机构地区：[1]湖南财经工业职业技术学院机电工程系,湖南衡阳421002 [2]衡阳华菱连轧管有限公司,湖南衡阳421001 [3]淄博市产品质量检验研究院,山东淄博255000

出　　处：《工程塑料应用》2023年第9期96-101,115,共7页Engineering Plastics Application

基　　金：2021年度湖南省自然科学基金项目(2021JJ50079);2019年衡阳市科技局科技计划项目(56)。

摘　　要：滚焊机控制器支架塑件使用玻纤改性聚甲醛合金进行成型,由于塑件体积较大且结构复杂的缘故,运用CAE进行优化分析后,使用三点点浇口对模腔进行浇注,因而模具结构相应采用三板模结构。采用三板模的另一个作用是模具的三次开模打开中,有两次打开可以用于驱动定模侧抽芯滑块实施侧抽芯动作,较好地解决了塑件上两个盒形倒扣的脱模难题。模具中设计了两个斜导柱滑块用于复杂组合特征的侧抽芯脱模,还设计了多个增强扁形针用于深筋位的顶出脱模,避免了设计弱小顶针工作时经常折断的问题。采用差异化模温解决玻纤改性聚甲醛成型时塑件表面易产生浮纤问题,型腔成型件使用热油冷却,温度95~100℃;型芯使用水冷,温度80~85℃。注射压力100 MPa,背压0.5 MPa。分三段保压将塑件翘曲变形控制在2.8 mm以下,第一段90 MPa-15 s,第二段70 MPa-10 s,第三段50 MPa-10 s。The plastic part of the roller welding controller bracket was formed with glass fiber modified polyoxymethylene.Due to the large volume and complex structure of the plastic part,after the optimization analys was by CAE,the mold cavity was gated with three points of gate,so the mold structure is correspondingly three-plate mold structure.Another function of the three-plate mold is that two of the three mold openings of the mold could be used to drive the side core-pulling slider of the fixed mold to carry out the side core-pulling action,which better solved the demoulding problem of the two box-shaped reverse buckles on the plastic parts.Two angle pin sliders were also designed in the mold for side core-pulling demoulding with complex combination features.A number of reinforced flat pins were also designed for ejection and demoulding of deep rib position to avoid the problem of often breaking when designing weak and small ejector pins.The differential mold temperature was used to solve the problem of floating fiber on the surface of plastic parts during the molding of glass fiber modified polyoxymethylene gold.The cavity molding parts were cooled by hot oil at a temperature of 95-100℃.The core was water-cooled,and the temperature is 80-85℃.The injection pressure is 100 MPa,and the back pressure is 0.5 MPa.The warpage deformation of plastic parts shall be controlled below 2.8 mm by three stages of pressure maintaining,the first stage is 90 MPa-15 s,the second stage is 70 MPa-10 s,and the third stage is 50 MPa-10 s.

关 键 词：聚甲醛 玻纤改性 注塑 滚焊机支架 定模抽芯 模具 

分 类 号：TG243[金属学及工艺—铸造]