摘要
以高径比为0.33的钼粉末坯料作为研究对象,运用MSC.Marc有限元仿真软件,采用热—机耦合分析方法,对其温压和温压扭成形过程进行了模拟,获得了两种工艺在不同摩擦条件下的粉坯相对密度分布及粉末径向流动规律,验证了有限元模型的可靠性。结果表明:两种成形中靠近侧壁的粉末相对密度分布规律相同;摩擦系数较小时,压扭工艺对温压粉坯相对密度分布改善不大;随着摩擦系数增大,温压扭成形粉坯致密性和相对密度分布均匀性提高;温压扭成形端面粉末距中心越远,径向位移越大,侧壁粉末距上模越近,径向位移越小。
The warm compaction and high-pressure torsion（HPT）process of molybdenum powder compact with aspect ratio 0.33 was simulated and analysed by MSC.MARC FEM software.The thermal mechanically coupled analysis method was applied to the process simulation.The pattem of relative density distribution and radial flow in two processes with different friction conditions were obtained,and the reliability of FE model was validated.It is shown that the distribution of relative density near side wall of powder body for two processes was similar,and the distribution of relative density improved slightly by applying to warm compaction process when friction coefficient was small.It is indicated that the density and the distribution of relative density for powder body by HPT process was improved with increase of friction coefficient.In HPT process the radial displacement was proportional to the distance between powder on the end face to the centre,and was inversely proportional to the distance between powder in the side wall to the top mould.
出处
《粉末冶金工业》
CAS
北大核心
2010年第5期31-34,共4页
Powder Metallurgy Industry
基金
国家自然科学基金资助项目(50875072)
安徽省优秀青年科技基金资助项目(10040606Y21)
霍英东教育基金资助项目(121053)
关键词
压扭工艺
钼粉
温压成形
数值模拟
HPT
molybdenum powder
warm compaction process
numerical simulation
