压制方式对粉末冶金制品性能影响的有限元模拟  

Finite element simulation to influence of compacting mode on PM product properties

作　　者：王德广[1] 吴玉程[1] 焦明华[2] 俞建卫[2] 解挺[2] 尹延国[2] 

机构地区：[1]合肥工业大学材料工程学院,合肥230009 [2]合肥工业大学摩擦学研究所,合肥230009

出　　处：《粉末冶金技术》2008年第2期88-93,共6页Powder Metallurgy Technology

基　　金：安徽省“十五”二期科技攻关项目(040020392);合肥市重点科技项目(20051044)

摘　　要：利用MSC/MARC有限元分析软件对金属粉末温压过程进行了模拟。采用基于更新拉格朗日方法的热—机耦合,分析了不同压制方式(单向压制、同步双向压制、非同步双向压制)对压坯性能的影响规律。对压坯相对密度及力学性能的分析表明,对于圆柱形压坯,压制方式不同,压坯相对密度和应力的分布状况及数值是不同的。采用双向同步压制,有利于提高压坯密度,改善压坯密度分布的均匀性。双向同步压制时压制力、侧压力、弹性后效、压坯等效应力均比其他两种情况要大,压坯等效应力分布状况与圆柱体镦粗变形相似,存在"摩擦死区"和"易变形区",等效应力分布比其他两种情况均匀。The process of the metal powder warm compaction was simulated by the finite element analysis software, MSC/MARC. The thermo-mechanical coupling analysis based on the updated Lagrangian Method was applied to study the effects of different compacting modes （namely single action compaction, synchronizing double action compaction, asynchronous double action compaction） on the properties of green compocts. The analysis for relative density and mechanical properties of green compact indicates that for the cylindrical green compacts, the distribution and values of relative density and stress of green compacts change with compacting modes. When synchronizing double action compaction is applied, it is propitious to improve uniformity of distribution and values of green density. Compared with other two compacting modes, pressing force, side pressure, spring back and equivalent stress of compact is larger, the distribution of equivalent stress is more even and the same as the forming of upsetting. There are ＇friction dying area＇ and ＇easily deformable area＇.

关 键 词：粉末 密度 有限元 压制 

分 类 号：TF37[冶金工程—冶金机械及自动化] TG302[金属学及工艺—金属压力加工]