压制工艺及压坯高径比对金属粉末致密化成形影响的模拟  

Simulation and Analysis on Effect of Pressing Processes and Height-diameter Ratio on Densification of Metal Powder

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,四川成都610031 [2]北京科技大学材料科学与工程学院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,江苏苏州215313

出　　处：《热加工工艺》2012年第18期64-68,共5页Hot Working Technology

摘　　要：利用MSC.MARC有限元分析软件对金属粉末压制成形过程进行了模拟,采用基于更新拉格朗日法描述的大位移弹塑性分析,研究压制方式、摩擦条件对不同侧压系数(K=2,K=4,K=8)圆管压坯性能的影响。结果表明,双向压制工艺相比单向压制工艺可提高压坯应力和密度分布均匀性;压坯高径比大时,两种压制工艺下压坯应力和密度不均现象加剧;摩擦条件的改善有利于增大金属粉末移动,减少应力集中,降低压制力,提高压坯密度均匀性。The metal powder compaction process was simulated by MSC.MARC FEM analysis software.The simulation applied elastic-plastic large displacement analysis based on the updated Lagrangian method was used to study the principle of the effect of different compacting processes（compacting style,friction condition） on the properties of pipe compacts which has different side pressing parameters.The results show that the double compaction process can improve the homogeneity of stress and density compared with single compaction.With the increase of height-diameter ratio,the distribution of stress and density in the compacts becomes more non-uniform,which is made by two kinds of processes.Improving friction condition is propitious to increase the displacement of metal powder,reduce the stress concentration,decrease compaction pressure force and improve the homogeneity of density in compacts.

关 键 词：粉末 致密化 有限元法 压制 

分 类 号：TF124[冶金工程—粉末冶金]