(电子科技大学 机械电子工程学院，成都 611731)
摘 要: 钛合金叶片的型面复杂，截面宽厚比大，且各截面之间有一定的转角，因而在叶片热模锻造后残余应力会使叶片产生回弹，从而影响叶片锻件的尺寸精度。采用不同的预成形毛坯，叶片终锻件的残余应力是不同的。因此，研究预成形设计对钛合金叶片热模锻造过程回弹的影响对提高叶片产品质量有重要意义。采用横截面为圆形和椭圆形的预成形毛坯，模拟和分析两种情况下叶片热模锻造过程，计算两种情况下叶片的回弹量。结果显示：采用椭圆形毛坯获得的叶片等效应变差值和温度差小，卸载后锻件的等效弹性应变较小，回弹量较小。
关键字: 预成形设计；热模锻造；残余应力；回弹
（School of Mechanical, Electronic and Industrial Engineering,
University of Electronic Science and Technology of China, Chengdu 611731, China）
Abstract:The titanium blade has characteristics of complex molding surface, very large ratio of cross-sectional width to thickness and a certain rotational angle between each cross-section. After the hot die forging, the existence of residual stress causes the spring-back of the blade, which reduces the dimension accuracy of the blade. Different preform design will affect the residual stress of the forged blade. Therefore, it is important to research the influence of the preform design on the spring-back in the hot die forging of the titanium blade. The circle cross-section and ellipse cross-section blank were designed. The blade forging processes with different blanks were simulated and analyzed, and then the blade spring-back was calculated. The result shows that the equivalent strain difference and the temperature difference of the blade which is forged from ellipse cross-section blank are little. The equivalent elastic strain after unloaded is little and the spring-back is little.
Key words: perform design; hot-die forging; residual stress; spring-back
