不同压制工艺下的粉末颗粒变形三维细观模拟研究  

Research on 3D Mesoscopic Simulation of Deformation of Powder Particles with Different Compacting Processes

作　　者：谷曼[1,2] 焦明华[3] 孙龙[3] 吴玉程[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230092 [2]合肥学院机械工程系,安徽合肥230601 [3]合肥工业大学机械与汽车工程学院,安徽合肥230092

出　　处：《热加工工艺》2015年第5期125-128,共4页Hot Working Technology

基　　金：安徽省高等学校省级自然科学研究重点项目(KJ2013A227);国家自然科学基金资助项目(51104051)

摘　　要：采用离散体的有限元法对压制过程中的粉末颗粒进行了三维细观数值模拟,通过分析三维球形颗粒模型的位移和应变来研究粉末压制过程,进而考察了不同压制力下颗粒的应变情况以及不同模壁摩擦和压制压力下模坯密度的变化情况。结果表明,压制过程中粉末颗粒的变形主要有3个阶段:小变形的初级阶段、应变剧烈的主变形阶段和应变趋于稳定的最后阶段。压制压力的提高并不能无限地提高压坯密度,应根据不同的粉末特性选择适当的压制力。另外,选择合适的模具摩擦条件能有效地提高粉末冶金压制的生产效率和质量。3D mesoscopic of powder particles in the compression process was numerically simulated by using finite element method of discrete body. Through the analysis of the displacement and strain of 3D spherical particles model, the powder compaction process was studied. The strain status of particles under different compacting pressures and changes of blank density under different compacting pressures with different die wall frictions were investigated. The results show that the deformation process of the compressed powder particles is main three stages： the initial stage of small deformation, the major stage of the sharply changes of strain and the ultimate stage of strain tending to stable state. Increasing compacting pressure can not indefinitely increase the compact density. Compacting pressure should be chosen according to the characteristics of different powders. Besides, selecting suitable die friction conditions can effectively improve the production efficiency and quality of powder metallurgy pressing.

关 键 词：粉末颗粒 三维细观模拟 应变分析 密度 

分 类 号：TG376[金属学及工艺—金属压力加工]