TA15钛合金板材在不同加载条件下的热剪切旋压变形机制(英文)  

Deformation Mechanism of TA15 Shells in Hot Shear Spinning under Various Load Conditions

作　　者：韩冬[1] 詹梅[1] 杨合[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《稀有金属材料与工程》2013年第2期243-248,共6页Rare Metal Materials and Engineering

基　　金：the National Natural Science Fund for Excellent Young Scholars of China(51222509);the National High Technology Research and Development Program of China(2008A404Z112);the National Natural Science Foundation of China(50405039);the Project of 111(B08040)

摘　　要：采用考虑了各种热效应而建立的TA15钛合金加热剪切旋压多场耦合模型,研究揭示了TA15钛合金在各种热载荷和机械载荷条件下的变形机制。结果表明,高的工件加热温度和芯模预热温度可以减小工件厚向温度梯度,偏离率对变形区厚向温差的影响复杂,对贴模性影响显著且大的偏离率会恶化贴模性。工件和旋轮间的摩擦对温度差有显著影响。增加旋轮进给比会加大厚向温差但有助于贴模性的改善,这与冷旋的结果相反。大的旋轮安装角有助于减小厚向温差和改善贴模性。Using the multi-field coupled analysis model with considering various thermal effects for the hot shear spinning of TA15 titanium alloy thin-walled shells, the deformation mechanism of thermal load conditions and mechanical load conditions have been elucidated. The results show that higher workpiece temperature and mandrel preheat temperature can bring about a smaller temperature gradient in the thickness direction, and the deviation ratio has a complicated effect on temperature difference of the deforming zone and a marked negative effect on the fittability. Moreover, the friction between workpiece and roller has a significant influence on the temperature difference. Increasing roller feed rate increases the temperature difference and decreases the fittability, which is opposite to that of the cold shear spinning, and a larger roller setting angle is favorable to the decrease of temperature difference and the improvement of the fittability.

关 键 词：钛合金 热剪切旋压 热力耦合 边界条件 

分 类 号：TG376[金属学及工艺—金属压力加工]