摘要：利用非线性有限元分析软件MSC/Marc, 通过热—机耦合弹塑性模型，模拟了纯镁旋锻变形过程，得到了应力和应变分布及变化情况，并且导出了防止两种旋锻缺陷产生的条件。结果表明，变形区可以分为三个部分：Ⅰ是工件头部，端面向外凸起；Ⅱ是已成形区；Ⅲ是压缩区。已成形区中应变沿径向分布不均匀，中心部位变形量还不及边缘部位的1/2。为防止发生锻不透和边缘裂纹两种缺陷的条件分别是：εc≥ε0,εe<εb。由变形不均引起的残余应力在18Mpa~30Mpa间。变形温升效应不显著。
Abstract: A general finite-element software program, Marc/Mentat, has been used to develop a coupled thermo-mechanical model of rotary swaging process of pure magnesium. Distributions and transitions of stress and strain are clarified and the critical conditions predicting two deformation defects are obtained. The deformation zone can be divided into three parts: Ⅰis the bulging head-end, Ⅱthe formed zone and Ⅲ the reduction zone. In the formed zone, the equivalent strain distributes inhomogeneously along the radial direction. The equivalent strain in the center is not more than half of that at the edge. The critical conditions preventing insufficient forging and edge-crack are εc≥ε0,εe<εb, respectively. The residual stresses are between 18MPa and 30MPa. Temperature-rising owing to the heat translateded from plastic deformation energy is not notable.
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