一、前言弹性轴是飞机发电机和发动机联接的重要零件,要求具有很高的疲劳强度。为了达到此目的,可以对它进行抛光、滚压或喷丸处理,但实验结果表明,提高零件的疲劳强度以喷丸强化效果较好。因为在进行喷丸处理时,零件表面经高速球体喷射以后,金属表面层的亚晶粒细化,表面产生硬化层;同时高速球体撞击零件时,表面层产生局部的纵向、横向的压缩应 I. Introduction Flexible shaft is an important part of aircraft generator and engine coupling, requiring high fatigue strength. In order to achieve this purpose, it can be polished, rolled or shot peening, but the experimental results show that to improve the fatigue strength of the parts shot peening better. Because during the shot peening, after the surface of the part is sprayed by a high-speed ball, the subgrain of the metal surface layer is refined and the surface is hardened; meanwhile, when the high-speed ball hits a part, the surface layer has local longitudinal and transverse compression