复合材料和钛合金在飞机装配制造领域使用比例大幅增加，碳纤维增强复合材料/钛合金叠层结构低损伤、高效率制孔成为航空制造领域研究的焦点。孔加工表面性状与连接疲劳强度密切相关，表面微观结构、硬化层、残余应力、微观力学性能及缺陷都可归结为表面性状。目前制孔工艺对表面性状的影响机制尚不明晰，对飞机运行安全构成挑战，严重制约航空制造技术的发展。本项目以CFRP/钛合金叠层制孔为研究对象，建立耦合不同振动方式的超声辅助螺旋铣孔新工艺，结合制孔过程数值分析，阐明超声振动作用下的材料去除机理及叠层结构损伤演化机制。研究超声振动对孔加工表面的微动摩擦及冲击作用，揭示微结构变化对钛合金残余应力、硬化层以及CFRP制孔缺陷的影响机制，建立超声辅助螺旋铣孔工艺与表面性状的映射关系，揭示CFRP/钛合金叠层超声辅助螺旋铣孔表面性状形成机理，为提高飞机装配制孔质量提供一种新工艺及理论基础。

With a significant growth in proportion of composite materials and titanium alloys in aircraft manufacturing field, the hole-making with small defects and high efficiency on the assembly of CFRP/Titanium alloy process becomes the key research topic. The microstructure, hardness layer, residual stress, micro mechanic behavior as well as the defects can be considered as the surface properties, which will affect the fatigue strength of the assembling parts. So far, the influence of hole-making processes on the surface properties is not clear, which will threaten the safety of working aircraft, and also limit the development of aviation manufacture. This project focuses on the hole-making of the assembly of CFRP/Titanium alloy. The processing of ultrasonic vibration assistant helical milling coupled with different way of vibration will be established. Using the experiment and numerical methods, the material removal mechanism of Titanium alloy and CFRP as well as the defects formation mechanism of the CFRP/Titanium alloy assembly will be expounded. The effect of small friction and small impact on the hole surface caused by the vibration will be studied. In addition, the control strategy for the surface properties of ultrasonic assistant helical milling of the assembly of CFRP/Titanium alloy should be obtained according to the relationship of hole-making processing and surface properties. The project will provide a new processing with high quality and high efficient and also the basic theory for aircraft manufacture.