基于Moldflow的汽车前保险杠大型精密注塑模具设计  

Design of Large Precision Injection Mold for Automotive Front Bumper Based on Moldflow

作　　者：张留伟[1,2] 符立华 洪维[1] 吕志超[1] 杨国峰 ZHANG Liu-wei;FU Li-hua;HONG Wei;LÜZhi-chao;YANG Guo-feng(Institute of Intelligent Manufacturing Equipment,Taizhou Vocational College of Science and Technology School,Taizhou 318020,China;Key Laboratory of Mold Intelligent Manufacturing of Taizhou,Taizhou 318020,China;Zhejiang Binhai Moulding Group Co.,Ltd.,Taizhou 318020,China)

机构地区：[1]台州科技职业学院装备制造研究所,浙江台州318020 [2]台州模具智能制造重点实验室,浙江台州318020 [3]浙江滨海模塑集团有限公司,浙江台州318020

出　　处：《塑料科技》2024年第11期130-135,共6页Plastics Science and Technology

基　　金：浙江省一般科研项目(Y202352555);台州市科技计划项目(23gyb32);台州科技职业学院青年专项项目(23QNZ05);台州市科技计划项目(24gyb30、24gyb27、24gyb28)。

摘　　要：利用Moldflow软件对汽车前保险杠进行模流分析优化,结合模拟分析结果及塑件结构特点,设计8点针阀式浇注系统,实现熔体流动前沿的速度相等,达到平衡充模。为了解决产品正面筋位多导致的开模后塑件被拉伤及粘在定模型腔的难题,创新性地设计了“弯销+活动压块+复位杆”的防塑件粘定模机构;采用“大斜顶+推块+T形块+活动拉杆”机械式抽芯机构成功解决了塑件两端倒扣抽芯空间小、难脱模的问题;采用“弹块+导向杆+氮气弹簧”的抽芯机构解决了塑件定模倒扣脱模问题;通过设计“齿轮+平衡块”机构解决了大型模具装在注射机后不平衡的调整难题;采用组合式的冷却水路结构,模温均匀;设计组合脱模机构,分两次顶出,效率高,安全可靠。经生产验证,模具运行平稳,塑件尺寸能够达到精度要求。Using Moldflow software to analyze and optimize the mold flow of a automotive front bumper,combined with simulation analysis results and the structural characteristics of the plastic parts,an 8-point needle valve gating system was designed to achieve equal velocity of the melt flow front and achieve balanced mold filling.In order to solve the problem of plastic parts being pulled and stuck to the fixed mold cavity after mold opening caused by multiple front rib positions of the product,an innovative anti plastic part sticking fixed mold mechanism with"bent pin+movable pressure block+reset rod"was designed.The mechanical core pulling mechanism of"large inclined top+push block+T-shaped block+movable pull rod"has successfully solved the problem of small space and difficult demolding of the reverse buckle core pulling at both ends of the plastic part.The core pulling mechanism of"spring block+guide rod+nitrogen spring"solved the problem of plastic fixed mold reverse buckle demolding.The problem of adjusting the imbalance of large molds installed in injection molding machines has been solved by designing a"gear+balance block"mechanism.Adopting a combined cooling water circuit structure,the mold temperature was uniform.A combined demolding mechanism that can be ejected in two stages was designed,with high efficiency and safety reliability.After production verification,the mold runs smoothly and the dimensions of the plastic parts met the accuracy requirements.

关 键 词：汽车前保险杠 防粘定模机构 斜顶内置推块 顺序阀热流道 模流分析 

分 类 号：TQ330.41[化学工程—橡胶工业] TQ320.52