ZM20镁合金微管拉拔成形性能的有限元模拟研究
Finite element simulation study on optimizing the drawing performance of ZM20 magnesium alloy microtubes
刘富国 1黄小惠 2彭怡 1余发艳 1彭鹏 1佘加 3龙帅 1张诚1
作者信息
- 1. 重庆科技大学 冶金与材料工程学院,重庆 401331
- 2. 西南交通大学 材料科学与工程学院,四川 成都 611756
- 3. 重庆大学 材料科学与工程学院,重庆 400044
- 折叠
摘要
采用有限元模拟的方法,研究对室温下ZM20 镁合金微管空拉和带芯棒拉拔对微管力学性能和表面质量的影响.应变速率对微管空拉过程的整体应力和应变影响较小,而对微管带芯棒拉拔的影响较大,特别是当应变速率在3s-1时应变增加,在11s-1时应变减少.随着应变速率的增加,两种工艺的金属流动速度增加,但带芯棒拉拔的金属流动更均匀.在拉拔过程中,外壁受到的应力通常大于内壁,且带芯棒拉拔可以使内壁变形更加均匀,尺寸精度更高.通过优化应变速率,有效提高了医用ZM20 镁合金微管的生产效率和质量.
Abstract
The finite element simulation method is employed to simulate the drawing process of magnesium alloy microtubes at room temperature.Two different drawing proces-ses,namely hollow drawing and drawing with a core rod,are considered.By adjusting the strain rate,the effects on the mechanical properties and surface quality during the microtube drawing process are explored.The strain rate has a minor influence on the overall stress and strain in hollow drawing,whereas it significantly affects drawing with a core rod,particularly increasing strain at 3 s-1 and decreasing it at 11 s-1.With increasing strain rate,the flow velocity of microstructure in both processes increases,with more uniform microstructure flow observed in drawing with a core rod.During drawing,the external wall generally experiences higher stress than the internal wall,and drawing with a core rod promotes more uniform de-formation of the internal wall,thus improving precision.By optimizing the strain rate,the production efficiency and quality of medical-grade magnesium alloy microtubes can be effec-tively enhanced.
关键词
ZM20镁合金/微管拉拔/有限元模拟/应变速率/金属流动Key words
ZM20 magnesium alloy/microtube drawing/finite element simulation/strain rate/microstructure flow引用本文复制引用
出版年
2024
NETL
NSTL
万方数据