CAJ | 학술논문

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.
채용MSC.MARC유한원모의연건대축투분체압제성형과정중분말적위이주향화분말위이대생배상대밀도적영향진행연구.동시,연구료불동모벽윤활조건이급불동후도고도비대생배밀도분포적영향.결과표명,분체성형과정중모벽마찰도치적위이체후효응결정료생배최종적상대밀도분포상황;분말적위이변화규률여생배적밀도분포상사.수착모벽윤활조건적개선화고도후도비적증가,생배적밀도분포균균성득도제고;우기시채용특수윤활시,생배밀도균균성득도료명현적개선.저사위연구분체압제치밀화과정제공료이론삼고의거.
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 arc similar.The uniformity of the green compact's relative density improves wim 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.