Abstract: Aiming at the problems that war-damaged aircraft titanium alloy skin damages were difficult to be efficiently cut， a novel in-situ cutting and repair process of pneumatic milling combined with CMJ lubrication was proposed. Through the developed aircraft skin portable pneumatic cutting test platform， the thin-walled titanium alloy pneumatic milling tests were carried out. The test results show that when the titanium alloy skin with a thickness of 1.5 mm is milling， the pneumatic motor may work in the best power range by using the up milling method， the 10 mm diameter milling cutter， and the milling width ae of 13 mm. With CMJ lubrication， re-cutting 12 times after each cutting with the same milling width may improve the tool life and cutting-edge shape accuracy. A prefect hole in a damaged specific aircraft skin was successfully prepared by using the portable pneumatic milling and cutting device and processing parameters developed herein， which provides a practical novel technology for repairing titanium alloy damages in aircrafts. 

Key words: aircraft battle damage, structural repair, pneumatic milling, combined-mist-jet（CMJ）, titanium alloy TC4

摘要： 针对战伤飞机钛合金蒙皮破孔损伤难以被高效切割的问题，提出了气动铣切结合复合油雾喷射（CMJ）润滑的原位切割修理新工艺，采用开发的飞机蒙皮便携气动切削试验平台开展了薄壁钛合金蒙皮气动铣切试验。试验结果表明，铣切厚度为1.5 mm的钛合金蒙皮时，采用逆铣方式、10 mm铣刀、铣削宽度ae为1～3 mm时，可使气动马达工作在最佳功率段内；采用CMJ润滑，每次切削后，保持原有铣削宽度再切削1～2次，可提高刀具寿命和切口形状精度。采用该便携气动铣切与润滑装置及优化工艺参数在某机体上成功实现了破孔损伤部位的修复用圆孔切割，为飞机钛合金损伤修理提供了简单、实用的技术方法。

关键词: 飞机战伤, 结构抢修, 气动铣切, 复合雾滴喷射, 钛合金TC4