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,720 北京科技大学学报 第29卷 则能够预测粉末注射成形中特有的两相分离及粉末 计算机模拟.计算机工程与应用，2003(4)：215 聚集现象，由于注射成形过程中，粉末颗粒相的体 [5]林建忠，流固两相拟序涡流及稳定性.北京：清华大学出版 社，2003 积分数较大，采用欧拉一拉格朗日模型会使计算量 [6]Shi X.Lin J Z.Direct simulation on two phase flows with two- 大增，容易导致计算结果的发散，且有可能得到不真 way coupling velocity model.Prog Nat Sci.2001.11(2):149 实解，故求解粉末注射成形充模流动的粉末一粘结 [7]Barriere T,Gelin J C.Liu B S.Improving mould design and in- 剂两相流问题采用双流体模型是较好的选择， jection parameters in metal injection moulding by 3D finite element simulation.J Mater Process Technol,2002(2):518 参考文献 [8]柳葆生，Barriere T h,Gelin JC.金属注射成形的数值模拟和 [1]Rosof B H.The metal injection molding process comes of age.J 高效算法.中国机械工程，2002,13(22)：1907 kter,1989,41(8):13 [9]Patankar NA.Joseph DD.Modeling and numerical simulation of [2]郑洲顺，曲选辉，韩旭里，等.粉末注射成形过程计算机数值模 particulate flows by the Eularian-Lagrangian approach.Int J Mul- 拟.中国机械工程，2002,13(14)：65 tiphase Flows.2001.27:1659 [3]German R M.Powder Injection Molding-Princeton:Metal Pow [10]Zhang DZ.Prosperetti A.Momentum and numerical energy e- der Industries Federation.1991 quations for disperse two phase flows and their closure for dilute [4]郑洲顺，曲选辉。粉末一粘结剂两相流模型的碰撞分析与 suspension.Int J Multiphase Flow.1977.23:425 Numerical simulation models of powder injection molding multiphase filling flow process WANG Yuhui),QU Xuanhui 2),HE Xinbo) 1)Materials Science and Engineering School.University of Science and Technology Beijing.Beijing 100083.China 2)National Key Lab for Powder Metallurgy.Central South University.Changsha 410083.China ABSTRACI The conception of multiphase flow and the two phase flow models were introduced into the field of powder injection molding (PIM).The single-fluid model,twofluid model and Eulerian-Lagrangain model for describing the powder-binder filling flow process were discussed.The characteristics of each model were briefly analyzed.Simulation results showed that the two fluid model was fitter than the single fluid model for describing the powder segregation,powder concentration and other special phenomena arising in PIM.Furthermore,the two-fluid model is easier to reach convergent than the Eulerian-Lagrangain model in simulating the PIM process- KEY WORDS powder injection molding:computational simulation:multiphase flow two phase flow model则能够预测粉末注射成形中特有的两相分离及粉末 聚集现象．由于注射成形过程中粉末颗粒相的体 积分数较大采用欧拉－拉格朗日模型会使计算量 大增容易导致计算结果的发散且有可能得到不真 实解．故求解粉末注射成形充模流动的粉末－粘结 剂两相流问题采用双流体模型是较好的选择． 参 考 文 献 ［1］ Rosof B H．The metal injection molding process comes of age．J Mater198941（8）：13 ［2］ 郑洲顺曲选辉韩旭里等．粉末注射成形过程计算机数值模 拟．中国机械工程200213（14）：65 ［3］ German R M．Powder Injection Molding．Princeton：Metal Powder Industries Federation1991 ［4］ 郑洲顺曲选辉．粉末－－－粘结剂两相流模型的碰撞分析与 计算机模拟．计算机工程与应用2003（4）：215 ［5］ 林建忠．流－固两相拟序涡流及稳定性．北京：清华大学出版 社2003 ［6］ Shi XLin J Z．Direct simulation on two-phase flows with twoway coupling velocity model．Prog Nat Sci200111（2）：149 ［7］ Barriere TGelin J CLiu B S．Improving mould design and injection parameters in metal injection moulding by3D finite element simulation．J Mater Process Technol2002（2）：518 ［8］ 柳葆生Barriere T hGelin J C．金属注射成形的数值模拟和 高效算法．中国机械工程200213（22）：1907 ［9］ Patankar N AJoseph D D．Modeling and numerical simulation of particulate flows by the Eularian-Lagrangian approach．Int J Multiphase Flows200127：1659 ［10］ Zhang D ZProsperetti A．Momentum and numerical energy equations for disperse two-phase flows and their closure for dilute suspension．Int J Multiphase Flow197723：425 Numerical simulation models of powder injection molding multiphase filling flow process WA NG Y uhui 1）QU Xuanhui 12）HE Xinbo 1） 1） Materials Science and Engineering SchoolUniversity of Science and Technology BeijingBeijing100083China 2） National Key Lab for Powder MetallurgyCentral South UniversityChangsha410083China ABSTRACT The conception of multiphase flow and the two-phase flow models were introduced into the field of powder injection molding （PIM）．The single-fluid modeltwo-fluid model and Eulerian-Lagrangain model for describing the powder-binder filling flow process were discussed．The characteristics of each model were briefly analyzed．Simulation results showed that the two-fluid model was fitter than the single-fluid model for describing the powder segregationpowder concentration and other special phenomena arising in PIM．Furthermorethe two-fluid model is easier to reach convergent than the Eulerian-Lagrangain model in simulating the PIM process． KEY WORDS powder injection molding；computational simulation；multiphase flow；two-phase flow model ·720· 北 京 科 技 大 学 学 报 第29卷