Numerical simulation of powder injection moulding filling process for intricate parts
Numerical simulation of powder injection moulding filling process for intricate parts
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DOI：
10.1179/174329006x95329
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发表时间：
2006-06
影响因子：
1.4
通讯作者：
Zhoushun Zheng;X. Qu
中科院分区：
文献类型：
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作者：
Zhoushun Zheng;X. Qu
粉末注射成形充模过程的数值模拟采用有限元分析软件ANSYS对YG8喂料进行了模拟，壁面采用无滑移边界条件。模拟了注塑件内的温度、速度、压力、粘度的瞬态分布及其发展过程。模拟结果表明，在充模结束时，物料在某些区域的瞬态温度高于初始温度，物料的粘度分布非常复杂。模拟结果表明，在注射成型过程中，粉末粘结剂的分离或在组件中的密度梯度可能会发生。分析了焊缝、空洞、缩痕等缺陷及可能出现的缺陷部位。用真实的生产和实验研究数据对模拟结果进行了验证。
A numerical simulation of the powder injection moulding filling process of the 57 vol.%YG8 feedstock was performed using the finite element analysis software ANSYS, for the no slip boundary condition employed at the wall. The flow process of the feedstock around obstacles was estimated; the transient distributions of temperature, velocity, pressure, viscosity and their development in the moulded part were simulated. The results of the simulation showed that the transient temperature in certain areas becomes higher than the initial temperature of the feedstock and the distribution of viscosity at the end of the filling stage is very complicated. The simulation results show that the powder binder separation or the density gradients in the component may occur during the injection moulding process. The defects such as weld lines, voids, sink marks and the possible defect sites were analysed. The simulation results are validated with real production and experimental research data.