基于CAE优化的烟雾报警器外壳注塑模具设计  

Design of injection mould for smoke alarm shell based on CAE optimization

作　　者：梁蓓 肖国华[1] 卢云祥 李香芬 郑子军[1] 杨少增 LIANG Bei;XIAO Guohua;LU Yunxiang;LI Xiangfen;ZHENG Zijun;YANG Shaozeng(School of Mechanical and Electrical Engineering,Zhejiang Business and Technology Institute,Ningbo 315012,China;Ningbo Huabao Intelligent Technology Co.,Ltd.,Ningbo 315600,China)

机构地区：[1]浙江工商职业技术学院机电工程学院,浙江宁波315012 [2]宁波华宝智能科技股份有限公司,浙江宁波315600

出　　处：《工程塑料应用》2024年第12期103-109,共7页Engineering Plastics Application

基　　金：浙江省教育厅一般科研课题(Y202351858,Y202351814)。

摘　　要：针对烟雾报警器塑件浇口开设困难、局部特征脱模困难、成型精度等级要求高等模具设计难题,为实现塑件的自动化注塑生产,首先在基于塑件设计制造分析的技术路线基础上,针对塑件的成型进行模具结构件布置可行性分析,而后运用CAE分析手段对单腔模腔进行了浇注、冷却系统的优化设计。优化后的单腔浇注系统中,使用单点牛角浇口进行浇注,在进浇口直径为0.8 mm的条件下,模腔的注射时间为0.5584 s左右,充填压力为30 MPa左右,流动前沿温差为3.8℃,浇口冻结时间为11.57 s,翘曲变形小于0.25 mm,注塑周期能控制在36.65 s内。基于CAE分析所设计的模具为一模两腔布局、冷流道两板式结构,单次开模,单次顶出。模具中针对塑件侧直壁使用了侧抽芯滑块进行成型和脱模以保证该直壁的外观完整,针对局部狭小位置空间既有侧孔又有倒勾的情况,采用集中脱模设计法设置一个多成型特征斜顶实施侧抽芯脱模。为便于模具制造,在滑块上增加临时固定螺杆,从而在配模时有利于滑块分型面的修配,另外在推板上加装拉杆以便于推板上众多顶出元件的安装。In response to the difficulties in setting gate location,demoulding local features,and requiring high molding accuracy levels for smoke alarm shell plastic parts in mould design,and in order to achieve automated injection molding production of the plastic parts,firstly,on the basis of the technical route based on design for manufacturing analysis of the plastic parts,a feasibility analysis of the layout of mould structural components was carried out for the forming of the plastic parts.Then,CAE analysis methods were used to optimize the design of the gating and cooling system for the single cavity of mould cavity.In the optimized single cavity gating system,a single bull horn gate was used for gating.Under the condition of a gate diameter of 0.8 mm,the injection time of the mould cavity is about 0.5584 s,the filling pressure is about 30 MPa,the flow front temperature difference is 3.8℃,the gate freezing time is 11.57 s,the warpage deformation is less than 0.25 mm,and the injection cycle can be controlled within 36.65 s.The mould designed based on CAE analysis has a layout of 1 mould with 2 cavities,a cold runner two plate structure,and a single mould opening and single ejection.In the mould,a side core-pulling slider was used for forming and demoulding the side straight wall of the plastic parts to ensure the integrity of the appearance of the straight wall.For the situation where there were both side holes and inverted hooks in the local narrow space,a centralized demoulding design method was adopted to implement side core-pulling demolding using a lifter with multi forming feature.For the convenience of mould manufacturing,a temporary fixing screw was added on the slider to facilitate the repair of the parting surface of the slider during mould matching,in addition,pull rods were installed on the ejector plate to facilitate the installation of numerous ejection components on the ejector plate.

关 键 词：烟雾报警器 CAE分析 设计制造分析报告 斜顶 滑块 推管 注塑 模具设计 

分 类 号：TG243[金属学及工艺—铸造]