| PIM充模流动过程中粘度的变化与缺陷形成 |
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| 引用本文： | 郑洲顺,曲选辉,雷长明.PIM充模流动过程中粘度的变化与缺陷形成[J].金属学报,2007,43(2):183-193. |
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| 作者姓名： | 郑洲顺 曲选辉 雷长明 |
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| 作者单位： | 中南大学数学科学与计算技术学院,长沙,410083;中南大学粉末冶金国家重点实验室,长沙,410083;中南大学数学科学与计算技术学院,长沙,410083;中南大学粉末冶金国家重点实验室,长沙,410083 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)
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国家重点项目
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湖南省普通高校青年骨干教师培养计划
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中南大学校科研和教改项目 |
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| 摘 要： | 通过对复杂几何形腔粉末注射成形(PIM)充模流动过程的数值模拟,给出了充模流动过程中模腔内粘度的变化和分布情况,分析了模腔内粘度的最终分布与PIM缺陷形成的关系.模拟结果表明,由于模腔接近充满时压力急剧升高构成无梯度压力场,导致模腔内粘度的最终分布复杂.在充模流动中心区域会形成较高粘度的小区域,分析了这些高粘度小区域的形成及其形状大小的变化过程.指出在流动中心区域形成的高粘度小区域可能使PIM充模流动过程产生粉末-粘结剂两相分离和成形坯件中粉末分布不均的现象.
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| 关 键 词： | 粉末注射成形 数值模拟 粘度分布 缺陷分析 |
| 文章编号： | 0412-1961（2007）02-0187-07 |
| 收稿时间： | 2006-03-21 |
| 修稿时间： | 2006-03-212006-09-13 |
Defects and Variation of viscosity in Powder Injection Molding Filling Process |
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| ZHENG Zhoushun,QU Xuanhui,LEI Changming.Defects and Variation of viscosity in Powder Injection Molding Filling Process[J].Acta Metallurgica Sinica,2007,43(2):183-193. |
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| Authors: | ZHENG Zhoushun QU Xuanhui LEI Changming |
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| Affiliation: | 1. School of Mathematical Science and Computational Technology, Central South University, Changsha 410083; 2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 ;3. National Key Lab for Powder Metallurgy, Central South University, Changsha 410083 |
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| Abstract: | The variations and distributions of viscosity during filling process of powder injection molding (PIM)are given by numerical simulation of PIM filling intricate part.The relation between the final distribution of viscosity and the defects in PIM was analyzed.The simulated results showed that the pressure in the cavity heightens sharply at the near end of the filling stage,which induced the distribution of viscosity at the end of the filling stage is very complicated.There are some small areas where viscosity is higher than that of nearby area in the melt flowing central region.The formation and shape change of the high viscosity areas are studied.The higher viscosity areas can make the powder-binder separate or the density gradient in the component occur during PIM process. |
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| Keywords: | powder injection molding (PIM) numerical simulation distribution of viscosity defect analysis |
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