Defects and Variation of viscosity in Powder Injection Molding Filling Process

Acta Metall Sin

2007, Vol. 43

Issue (2): 183-193 DOI:

Research Articles

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Defects and Variation of viscosity in Powder Injection Molding Filling Process

Zheng Zhou-Shun;

中南大学数学科学与计算技术学院

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Zheng Zhou-Shun. Defects and Variation of viscosity in Powder Injection Molding Filling Process. Acta Metall Sin, 2007, 43(2): 183-193 .

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Abstract The variations and distributions of viscosity in PIM filling process are given by numerical simulation of PIM filling process for intricate part. The relation between the final distribution of viscosity and the defects in PIM are analyzed. The results of the simulation showed that the pressure in the cavity heightens sharply at the near end of the filling stage, and then the distributions of velocity and viscosity change rapidly accordingly. As a result of these changes, the distribution of viscosity at the end of the filling stage is very complicated. There are some small areas which viscosity is higher than nearby areas’ in the melt flowing central region. And the process of forming the high viscosity areas and the changing of their geometrical shape are studied. It shows that the powder-binder separation or the density gradients in the component may occur during PIM process.

Key words: Powder Injection Molding Numerical Simulation Distribution of viscosity Defect analyze

Received: 21 March 2006

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