摘要
通过热-机耦合弹塑性模型,采用有限元分析软件MSC. Marc,对纯镁旋锻过程进行了模拟,着重分析了锻模圆锥进料角α对旋锻变形应变场的影响。结果表明:随α增大,各节点变形所需脉冲锻打次数减少,而每次锻打的应变量增加,因而小圆锥进料角有利于低塑性材料的变形;随圆锥进料角α增大,应变沿工件径向分布趋于均匀,且α增大到一阈值αTres后,继续增大不再对应变的径向分部产生影响,在本模拟的工艺条件下,αTres=21°40′;工件外表面应变沿轴向分部呈脉冲似波动,且随α增大,波动的振幅增大;在本模拟的工艺条件下,9°30′≤α≤21°40′是合适的。实验结果与模拟结果吻合较好。
A general finite-element software program, MSC/Marc, has been used to develop a coupled thermo-mechanical model of rotary swaging process for pure magnesium. The emphases are on the effects of the conical feeding angle α on the rotary swaging process. It is concluded that the strain distribution turns more homogeneous with the increase of α up to a threshold value αTres, then no more influence on the homogeneity of the strain distribution. Under the technological conditions simulated in this article, the threshold value is 21.7°. The strain distribution in the exterior cylindrical surface exhibits periodical pulses along the axial direction and the pulse-height enlarges with the increase of α. It is appropriate for 9.5°≤α≤21.7° under the technological conditions simulated in this article. The simulated results agree well with the experimental ones.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2007年第2期221-225,共5页
Rare Metal Materials and Engineering
基金
科技部攻关专项"铝镁材料研究"(98009999200301)
关键词
旋锻
镁
有限元
模具结构参数
swaging
magnesium
finite element model
die geometric parameter
