为提高飞机、空间探测器、和导弹等飞行器的飞行性能和结构可靠性，减小燃油损耗，CFRP/钛合金叠层结构在航空航天领域的应用正在迅速增加。面对CFRP/钛合金叠层结构制孔过程中易出现CFRP孔壁损伤、CFRP入口表面分层与撕裂、CFRP/钛合金界面损伤等加工缺陷与刀具寿命短的难题，本项目提出开展基于材料去除特性的低频振动辅助制孔方法，通过改变钛合金切屑形状与控制低频振动辅助制孔的轴向力，有望解决CFRP/钛合金叠层结构的加工难题。研究内容包括：振动形式对CFRP、钛合金材料去除的作用机制、叠层结构低频振动辅助制孔机理、低频振动辅助制孔刀具研制与刀具磨损机理研究与低频振动辅助制孔工艺研究。对于提高CFRP/钛合金叠层结构的加工质量与延长刀具寿命具有重要的理论意义和实际应用价值。同时该研究对完善CFRP/钛合金叠层结构低频振动辅助加工基础理论，促进多学科的交叉融合，起到重要的支撑和推动作用。

In order to improve the flight performance, structural reliability and to reduce fuel consumption of various aircraft such as aircraft, space probes, and missiles, applications of the CFRP / titanium alloy stacks in the aerospace industry are rapidly increasing. However, in the drilling of CFRP / titanium alloy stacks, there exists many quality problem such as CFRP hole wall damage, CFRP entry delamination and spalling, CFRP / titanium alloy interface damage, and tools short life expectancy. The object of the project is to improve processing quality and tool life by low-frequency vibration assisted drilling (LFVAD) CFRP / titanium alloy stacks based on material removal characteristics, developing drilling geometry and optimizing processing parameters of LFVAD. The main contents of the project include the effect of vibration form on removal of CFRP and titanium alloy, the LFVAD mechanism, the design and manufacture of LFVAD drill, tool wear mechanism and processing parameters of LFVAD. It has important theoretical significance and practical application value to improve the processing quality of CFRP / titanium alloy stacks and prolong the tool life. Meanwhile, the research plays an important role in perfecting theoretical system of LFVAD CFRP / titanium alloy stacks.