锻压技术

粉末颗粒压制变形的细观模拟分析

英文标题：Microscopic simulation of compression deformation process of powder particles

作者：孙龙焦明华尹延国李达邱婷谷曼

单位：合肥工业大学合肥学院

分类号：TF121

出版年,卷(期):页码：2013,38(5):169-174

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.

基金项目：

孙龙（1987-)，男，硕士研究生

参考文献：

［1］赵三明.粉末冶金是制造绿色汽车的优选[N]. 中国工业报，2011-02-25.Zhao S. Powder metallurgy is preferred to manufacture green cars[N].China Industry News,2011-02-25.
［2］王德广，吴玉程，焦明华.不同压制工艺对粉末冶金制品性能影响的有限元模拟[J].机械工程学报，2008，44（1）：205-211.Wang D G, Wu Y C, Jiao M H. Finite element simulation of influence of different compacting processes on powder metallurgic products properties[J].Chinese Journal of Mechanical Engineering,2008,44(1):205-211.
［3］赵伟斌,李元元，周照耀，等.金属粉末温压成形的数值模拟研究[J].粉末冶金工业,2004,14(5):28-32.Zhao W B, Li Y Y, Zhou Z Y, et al. Numerical simulation study of metallic powder warm compaction process [J]. Powder Metallurgy Industry, 2001, 14(5):28-32.
［4］王德广，焦明华，俞建卫.压坯高径比对粉末冶金制品性能影响的有限元模拟[J].机械工程学报，2007，18（20）：2493-2496.Wang D G, Jiao M H, Yu J W. FE simulation of influence of height-diameter ratio on powder metallurgic product properties [J]. Chinese Journal of Mechanical Engineering, 2007, 18(20): 2493-2496.
［5］柏厚义.界面摩擦对铁粉压制成形影响的细观模拟研究[D]. 合肥：合肥工业大学，2009.Bai H Y. Research on the Micro-simulations of Influence of Interface Friction on Metallic Powder Compaction [D]. Hefei:Hefei University of Technology, 2009.
［6］刘凯欣，高凌天.离散元法研究的评述[J].力学进展，2003，33（4）：483-490.Liu K X, Gao L T. A review on the discrete element method [J].Advances in Mechanics, 2003, 33(4):483-490.
［7］程远方，果世驹，赖和怡.球形颗粒随机排列过程的计算机模拟[J].北京科技大学学报，1999，21（4）：387-391.Cheng Y F, Guo S J, Nai H Y. Computer simulation of random packing of spherical particles [J]. Journal of University of Science and Technology Beijing, 1999，21（4）：387-391.
［8］焦明华，柏厚义，俞建卫，等.金属粉末压制成形的细观模拟研究[J]金属功能材料，2008,15(5):28-32.Jiao M H, Bai H Y, Yu J W,et al. Research on the micro-simulations of metallic powder compaction[J].Metallic Functional Materials，2008,15(5):28-32.
［9］陈明祥.弹塑性力学[M]. 北京:科学出版社，2007.Chen M X. Elasticity and Plasticity [M]. Beijing: Science Press，2007.
［10］陈火红.Marc有限元实例分析教程[M].北京:机械工业出版社,2007.Chen H H. The Instance of Marc Finite Element Analysis[M]. Beijing：China Machine Press. 2007.
［11］陈文革.粉末冶金工艺及材料[M].北京：冶金工业出版社,2011.Chen W G. Powder Metallurgy Process and Material[M].Beijing：Metallurgical Industry Press,2011.
［12］李新国，蔡胜忠，李绍鹏.应用数字图像技术测定油梨叶面积[J].热带农业科学，2009，29（2）：10-13.Li X G, Cai S Z, Li S P.Measurement of avocado leaf area based on digital image processing technology[J]. Tropical Agricultural Science, 2009, 29(2):10-13.

服务与反馈：

【文章下载】【加入收藏】