Numerical simulation of tungsten alloy in powder injection molding process

来源期刊:中国有色金属学报(英文版)2008年第5期

论文作者:郑振兴 夏伟 周照耀 朱权利

文章页码:1209 - 1215

Key words:powder injection molding; tungsten alloy; numerical simulation; finite element method; finite difference; control volume method

Abstract: The flow behavior of feedstock for the tungsten alloy powder in the mold cavity was approximately described using Hele-Shaw flow model. The math model consisting of momentum equation, consecutive equation and thermo-conduction equation for describing the injection process was established. The equations are solved by the finite element/finite difference hybrid method that means dispersing the feedstock model with finite element method, resolving the model along the depth with finite difference method, and tracking the movable boundary with control volume method, then the pressure equation and energy equation can be resolved in turn. The numerical simulation of the injection process and the identification of the process parameters were realized by the Moldflow software. The results indicate that there is low temperature gradient in the cavity while the pressure and shear rate gradient are high at high flow rate. The selection of the flow rate is affected by the structure of the gate. The shear rate and the pressure near the gate can be decreased by properly widening the dimension of the gate. There is a good agreement between the process parameters obtained by the numerical simulation and the actual ones.

基金信息:the Transformation of the Scientific and Technological Achievement of the Colleges in Guangdong Province, China

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