Effects of Heating Temperatures on Hot Spinning of TAl5 Alloy Thin-walled Shell

摘要

Titanium alloy thin-walled shells,formed by hot spinning, have been attracting more and more applications, in aerospace, aviation, military and other technical industries,due to its highly forming precision and satisfyingly increasing needs for thinwalled and high strength/weight ratio products. The hot spinning of titanium alloy thin-walled shells is a complex multi-physics problem with multi-factor coupling interactive effects, and the heating temperatures have significant influences on the spinning qualities of workpieces. Therefore,in this study,using a 3D elastic-plastic finite element (FE) model for the hot spinning of TAl5 alloy thin-walled shell,the influence laws of preheating temperature of mandrel and heating temperature of blank on forming qualities are revealed. The results show that: preheating temperature of mandrel and heating temperature of blank have significant influence on maximum tangential tensile stress. With the increasing of preheating temperature of mandrel and heating temperature of blank, the tangential tensile stress first decreases then increases The reasonable preheating temperature and the heating temperature are about 400°C and 750°C, respectively. Finally, the satisfied workpieces are obtained with the above parameters. The results may provide a theoretical guide for the determination and optimization of forming temperature of relative spinning process.