AZ31镁合金板材轧制-剪切-连续弯曲变形工艺有限元分析

发布时间：2019-07-28 14:36

【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。
[Abstract]:Taking AZ31 magnesium alloy sheet as the research object, the plastic deformation behavior of the sheet during the new rolling-shear-continuous bending deformation process was studied by finite element numerical simulation, and the influence of different die structures on the severe plastic deformation characteristics of the sheet was analyzed. The die structure parameters were preliminarily optimized. Finally, the rolling-shear-continuous bending magnesium alloy sheet with good surface quality was successfully prepared. The results show that with the increase of the inner chamfer radius and die channel gap at the die corner, the distribution of equivalent variation isoline tends to be complex, and the shear deformation strain introduced decreases gradually, and the strain gap between the upper and lower surface layer and the neutral layer of the plate is further aggravated due to the continuous bending deformation. By adjusting the inner fillet radius, channel clearance and bending radius at different rotation angles in the same die, the combination of shear deformation and bending deformation can be realized, which is helpful to control the accumulated strain and reduce the cracking tendency of the sheet during deformation.
【作者单位】：重庆理工大学材料科学与工程学院;重庆理工大学重庆市模具工程技术研究中心;
【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)
【分类号】：TG339

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