金属粉末压制成形机理及影响因素模拟分析  

Simulation and Analysis of Compaction Mechanism and Influencing Factors in Powder Compacting Process

作　　者：郭彪[1] 葛昌纯[1,2] 颜永年 张随财[2] 余本军 

机构地区：[1]西南交通大学材料科学与工程学院,成都610031 [2]北京科技大学特种陶瓷粉末冶金研究所,北京100083 [3]苏州昆仑先进制造技术装备有限公司,苏州215313

出　　处：《材料导报》2012年第14期141-145,共5页Materials Reports

摘　　要：利用MSC.MARC有限元分析软件对金属粉末致密化成形过程进行了模拟分析。采用基于更新拉格朗日方法描述的大位移弹塑性分析,研究了不同工艺(压制方式、摩擦条件)对不同侧压系数(K=4、6、8)压坯中金属粉末致密化成形行为的影响规律。结果表明,双向压制工艺相比单向压制工艺可改善压坯应力和密度均匀性;摩擦条件的改善有利于增大金属粉末移动,减少应力集中,降低粉末压制力,提高压坯密度均匀性;而相同压制工艺下,压坯高径比小时,密度分布更均匀。The metal powder compaction process was simulated with MSC. MARC FEM analysis software. The simulation applied elastic-plastic large displacement analysis based on the updated Lagrangian method to study the principle of the impact of different compacting processes （compacting style, friction condition） on densification of metal powder in pipe green pressing process which have different side pressing parameters （K= 4,6,8）. The results show that double compaction process can improve the homogeneity of stress and density compared with single compaction. Improving friction condition is propitious to increase the displacement of metal powder, reduce stress concentration, decrease compaction pressure, and also improve the homogeneity of density in compacts. With the decrease of height- diameter ratio, the distribution of density in the compact become more uniform.

关 键 词：粉末 致密化 有限元方法 压制 

分 类 号：TF124[冶金工程—粉末冶金]