微型齿轮半热流道多腔成型工艺设计与优化  

Design and Optimization of Multi-cavity Forming Process of Semi-hot Runner of Micro-gear

作　　者：李祥 肖淑莹 彭必友[1] 蒋心豪 Li Xiang;Xiao Shuying;Peng Biyou;Jiang Xinhao(School of Materials Science and Engineering,Xihua University,Chengdu 610039,China)

机构地区：[1]西华大学材料科学与工程学院,成都610039

出　　处：《工程塑料应用》2018年第12期84-89,共6页Engineering Plastics Application

基　　金：四川省大学生创新创业项目(201810623098)

摘　　要：基于半热流道技术和正交试验,对微型齿轮半热流道多型腔成型过程进行数值模拟。相比于传统冷流道,半热流道技术更有助于完成微型尺寸的充填。运用Moldflow软件进行分析,对比三种型腔在填充时间、压力和剪切速率,发现采用Y形布局的方案为最优,但其剪切速率仍然超过了材料的最大剪切速率,因此需优化浇口设计以降低剪切速率,当浇口从非锥体式改为锥体式且长度不变时,填充效果最好。正交试验结果表明,流动速率、模具温度、熔体温度、注塑压力等四个成型工艺参数对微型齿轮填充率的影响依次减低,最佳工艺方案为注塑压力120MPa、流动速率0.016cm3/s、模具温度60℃、熔体温度180℃。Based on the semi-hot runner technology and orthogonal experiments,numerical simulation of the forming process of micro gear multi-cavity with semi-hot runner was carried out.Compared with the traditional cold runner,the semi-hot runner technology was more helpful to complete the micro size filling.Using the Moldflow software for analysis,the time,pressure and shear rate of the three kinds of cavity when filling were compared,it was found that the scheme using Y-shaped layout was optimal,but the shear rate still exceeded the maximum shear rate of the material.Therefore,the gate design was optimized to reduce the shear rate.The filling effect was best when the gate was changed from a non-cone type to a cone type and the length was constant.The orthogonal test results showed that the influence of four molding parameters,such as flow rate,mold temperature,melt temperature and injection pressure,on the filling rate of micro-gear was reduced in turn,and the best process scheme was that the injection pressure was 120 MPa,the flow rate was 0.016 cm^3/s,the mold temperature was 60℃,and the melt temperature was 180℃.

关 键 词：微注塑 微型齿轮 半热流道 MOLDFLOW 正交试验 

分 类 号：TQ320.66[化学工程—合成树脂塑料工业]