摘要
采用MSC.MARC有限元模拟软件对轴套粉体压制成形过程中粉末的位移走向和粉末位移对生坯相对密度的影响进行研究。同时,研究了不同模壁润滑条件以及不同厚度高度比对生坯密度分布的影响。结果表明,粉体成形过程中模壁摩擦导致的位移滞后效应决定了生坯最终的相对密度分布状况;粉末的位移变化规律与生坯的密度分布相似。随着模壁润滑条件的改善和高度厚度比的增加,生坯的密度分布均匀性得到提高;尤其是采用特殊润滑时,生坯密度均匀性得到了明显的改善。这些为研究粉体压制致密化过程提供了理论参考依据。
The displacement direction of powder and the influence of powder＇s displacement on the green compact＇s relative density of shaft sleeve powder in the compacting process were simulated by MSC.MARC FEM analysis software.In the mean time,the influences of different lubrication condition of the die wall and different thickness-to-height ratio on the distribution of green compact＇s relative density were also studied.The results show that the relative density distribution of the green compact is determined by the displacement lag effect caused by the die wall friction in the compacting process;the change law of powder＇s displacement and the relative density distribution of the green compact in the compacting process are similar.The uniformity of the green compact＇s relative density improves with the improvement of lubrication condition and the increase of thickness-to-height ratio.Especially,the uniformity of the compacts＇ relative density obviously improves under special lubrication condition.This work can lay the theory foundation for the study of the powder densification process.
出处
《热加工工艺》
CSCD
北大核心
2010年第7期1-5,共5页
Hot Working Technology
基金
安徽省"十五"科技攻关项目(040020392)
合肥市重点科技攻关项目(20051004)
关键词
粉末
压制
数值模拟
位移滞后效应
相对密度
powder
compact
numerical simulation
displacement lag effect
relative density
