| Phase Behaviors in Bi-phase Simulation of Powder Segregation in Metal Injection Molding |
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| 作者姓名： | 柳葆生 范小欣 成志强 |
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| 作者单位： | Department of Applied Mechanics and Engineering, Southwest Jiaotong University, Chengdu 610031, China |
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| 基金项目： | Specialized Research Fund for the Doetoral Program of Higher Education （ No. 20020613005） |
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| 摘 要： | Powder segregation induced by mold filling is an important phenomenon that affects the final quality of metal injection molding （MIM）. The prediction of segregation in MIM requires a bi-phase flow model to describe distinctly the flows of metallic powder and polymer binder. Viscous behaviors for the flows of each phase should hence be determined. The coefficient of interaction between the flows of two phases should also be evaluated. However, only viscosity of the mixed feedstock is measurable by capillary tests. Wall sticking is supposed in the traditional model for capillary tests, while the wall slip is important to be taken into account in MIM injection. Objective of the present paper is to introduce the slip effect in bi-phase simulation, and search the suitable way to determine the viscous behaviors for each phase with the consideration of wall slip in capillary tests. Analytical and numerical methods were proposed to realize such a specific purpose. The proposed method is based on the mass conservation between the capillary flows in mono-phase model for the mixed feedstock and in bi-phase model for the flows of two phases. Examples of the bi-phase simulation in MIM were realized with the software developed by research team. The results show evident segregation, which is valuable for improving the mould designs.
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| 关 键 词： | 粘性行为 双相位模拟 粉体分离 金属注入成型 墙滑差 |
| 文章编号： | 1005-2429（2006）04-0363-09 |
| 收稿时间： | 2005-11-08 |
Phase Behaviors in Bi-phase Simulation of Powder Segregation in Metal Injection Molding |
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| Liu Baosheng,Fan Xiaoxin,Cheng Zhiqiang.Phase Behaviors in Bi-phase Simulation of Powder Segregation in Metal Injection Molding[J].Journal of Southwest Jiaotong University,2006,14(4):363-371. |
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| Authors: | Liu Baosheng Fan Xiaoxin Cheng Zhiqiang |
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| Abstract: | Powder segregation induced by mold filling is an important phenomenon that affects the final quality of metal injection molding (MIM). The prediction of segregation in MIM requires a bi-phase flow model to describe distinctly the flows of metallic powder and polymer binder. Viscous behaviors for the flows of each phase should hence be determined. The coefficient of interaction between the flows of two phases should also be evaluated. However, only viscosity of the mixed feedstock is measurable by capillary tests. Wall sticking is supposed in the traditional model for capillary tests, while the wall slip is important to be taken into account in MIM injection. Objective of the present paper is to introduce the slip effect in bi-phase simulation, and search the suitable way to determine the viscous behaviors for each phase with the consideration of wall slip in capillary tests. Analytical and numerical methods were proposed to realize such a specific purpose. The proposed method is based on the mass conservation between the capillary flows in mono-phase model for the mixed feedstock and in bi-phase model for the flows of two phases. Examples of the bi-phase simulation in MIM were realized with the software developed by research team. The results show evident segregation, which is valuable for improving the mould designs. |
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| Keywords: | Viscous behaviors Bi-phases simulation Powder segregation Metal injection molding Wall slip |
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