AZ31镁合金板材轧制-剪切-连续弯曲变形工艺有限元分析  

Finite element analysis of AZ31 magnesium alloy sheet in the rolling-shearing-continuous bending deformation process

作　　者：蒋伟[1] 周涛[1,2] 胡冬[1] 宋登辉 

机构地区：[1]重庆理工大学材料科学与工程学院,重庆400054 [2]重庆理工大学重庆市模具工程技术研究中心,重庆400054

出　　处：《轻合金加工技术》2017年第1期17-22,28,共7页Light Alloy Fabrication Technology

基　　金：国家自然科学青年基金项目(51301213);重庆市基础与前沿研究计划项目(cstc2014jcyj A50008;cstc2016jcyj A0452)

摘　　要：以AZ31镁合金板材为研究对象,通过有限元数值模拟,研究了轧制-剪切-连续弯曲变形新工艺过程中板材的塑性变形行为,并分析了不同模具结构对板材剧烈塑性变形特征的影响,初步优化了模具结构参数,最后成功制备出表面质量良好的轧制-剪切-连续弯曲变形镁合金板材。结果表明,随着模具转角处内侧倒角半径和模具通道间隙的增大,等效应变等值线分布趋于复杂,引入的剪切变形应变量逐渐减小;连续弯曲变形导致板材上下表层与中性层的应变量差距进一步加剧;通过调控同一模具中不同转角处内侧圆角半径、通道间隙以及弯曲半径的数值,能实现模具不同转角处剪切变形和弯曲变形的组合,有助于控制积累的应变量,从而减小板材在变形过程中开裂的倾向。Finite element simulation was carried out in the rolling-shearing-continuous ben- ding deformation process to study the plastic deformation behavior of AZ31 magnesium alloy sheet and the effects of different mold structures on the severe plastic deformation character- istics. The mold structure parameters were preliminarily optimized, and the magnesium alloy sheet was finally prepared with a good surface quality. The results show that as the chamfer radius inside the die comer and the channel clearance increase, contour distribution of equiv- alent strain becomes more complex and the shear deformation strain decreases as introduced. Continuous bending deformation leads to the further increase of the gap between the upper/ lower layers and the neutral layer of the sheet. A combination of shear deformation and ben- ding deformation in different mold corners can be obtained through the regulation of the chamfer radius inside different comers and channel clearance of the same die, which help control strain accumulation, thereby reducing the cracking tendency of the sheet in the de- formation process.

关 键 词：轧制-剪切-连续弯曲变形 有限元模拟 变形行为 AZ31镁合金 

分 类 号：TG339[金属学及工艺—金属压力加工]