圆锥进料角对纯镁旋锻变形影响规律的热机耦合有限元模拟  

Finite Element Simulation of Effect of Conical Feeding Angle on Swaging Strain Distribution of Pure Magnesium

作　　者：荣莉[1] 聂祚仁[1] 左铁镛[1] 

机构地区：[1]北京工业大学,北京100022

出　　处：《稀有金属材料与工程》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)

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.

关 键 词：旋锻 镁 有限元 模具结构参数 

分 类 号：TG316[金属学及工艺—金属压力加工]