数值模拟研究浇口方式对粉末注射成形铣刀粉体分布的影响  

Numerical simulation research on the effect of gate patterns on powder volume fraction variation of MIM milling cutter

作　　者：刘飞[1] 李文明[1] 王青云 LIU Fei;LI Wenming(Department of Mechanical Engineering,Zhonghuan Information College,Tianjin University of Technology,Tianjin 300380,China)

机构地区：[1]天津理工大学中环信息学院机械工程系,天津300380

出　　处：《粉末冶金材料科学与工程》2018年第3期292-297,共6页Materials Science and Engineering of Powder Metallurgy

摘　　要：针对金属注射成形工艺制备立铣刀,设置具有不同数量和位置的4种浇口方式,结合Cross-WLF粘度模型,采用moldflow2017软件,研究浇口方式对粉体浓度分布的影响。结果表明,浇口位置和浇口数量都会影响充模过程中粉末浓度的分布。在喂料的充模过程中,压力对粉末浓度分布影响不大。浇口方式不同,喂料在充模过程中发生较大剪切速率的变化,进而导致粉末浓度分布出现较大差异。采用2个浇口从刀柄端面两侧注射的浇口方式注射成形时,粉末浓度的波动在±0.5%范围内,粉末分布均匀且充模时间短,满足注塑成形工艺要求,是最优的浇口方式。In this paper,milling cutter was prepared,by metal injection molding(MIM)process under four gate patterns with different numbers and locations.Combined with Cross-WLF viscosity model,the influence of the gate patterns on powder concentration was analyzed using Moldflow2017 software.The results show that the position and the number of the gates can affect the distributions of the powder in the milling cutter.While filling,the pressure has little effect on the distribution of powder concentration.For,different gate patterns,the change of shear rate of the feeding is different during the filling process,thus the distribution of powder concentration appears obvious difference.Using two gates in the end of handle plane,while filling,the distribution of powder concentration is in the range of±0.5%.The powder distribution is evenly distributed,which meets the requirements of injection molding process.It is the optimal gate patterns when milling cutter is prepared by MIM.

关 键 词：金属注射成形 立铣刀 浇口方式 粉末浓度分布 Moldflow2017 

分 类 号：TF125[冶金工程—粉末冶金]