粉末颗粒压制变形的细观模拟分析  

Microscopic simulation of compression deformation process of powder particles

作　　者：孙龙[1] 焦明华[1] 尹延国[1] 李达[1] 邱婷[1] 谷曼[2] 

机构地区：[1]合肥工业大学摩擦学研究所,安徽合肥230009 [2]合肥学院机械工程系,安徽合肥230601

出　　处：《锻压技术》2013年第5期169-173,共5页Forging & Stamping Technology

基　　金：国家自然科学基金青年项目(51104051);安徽高校省级自然科学重点项目(KJ2013A227)

摘　　要：基于离散体的有限元法对粉末颗粒压制过程进行了细观数值模拟,考察了典型位置颗粒的应变过程、不同位置颗粒的变形差异以及颗粒在不同压制力下的应变情况。分析表明,压制过程中粉末颗粒的变形主要分为小变形初级阶段、应变剧烈的主变形阶段和应变趋于稳定阶段,模壁界面摩擦对于模壁区域颗粒的变形和压制密度有显著影响,增加压坯压制力并不能无限的提高压坯密度。The compression deformation processes of powder particles were investigated via mesoscopic simulation based on finite element method of discrete body. The strain process of the particles in typical position, the deformation difference of the particles in different positions and the strain status of particles under various compacting pressure were investigated. The results show that the deformation process of the pressed powder particles consists of three stages, which are 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. The interface friction has a significant influence on deformation and pressed density of particles close to die wall. The pressed density cant be increased with the increase of compacting pressure of compaction infinitely.

关 键 词：粉末颗粒压制 细观模拟 应变 压坯密度 

分 类 号：TF121[冶金工程—粉末冶金]