目的 预测高速内冷铣孔过程中空蚀的发生，并初步揭示高速内冷铣削过程中铣刀空蚀失效机理及已加工工件表面的空蚀损伤机理。方法 采用三维数值分析与实验相结合的方法，在建立高速内冷铣削封闭流场的基础上进行数值计算，搭建了高速内冷空蚀试验平台并进行实验，通过粗糙度仪对分段后工件样条的已加工表面进行测定，通过电子显微镜对实验后的分段工件样条已加工表面和铣刀形貌进行分析。结果 仿真分析发现用f40 mm立铣刀以14 500 r/min转速铣削f60 mm′50 mm孔时，流场中的含气率达到10%左右，预测了高速内冷铣削过程中空蚀现象的存在，空蚀后楔形发散区的孔壁粗糙度Ra为0.311~0.478 mm，楔形收缩区的孔壁粗糙度Ra为0.138~0.317 mm。工件已加工表面出现麻点和海绵状为主的空蚀针孔，铣刀侧后面出现蜂窝状和鱼鳞状的空蚀坑。结论 仿真分析和实验共同验证了高速内冷铣削过程中空蚀现象的存在，空蚀位置可能出现在内冷铣刀侧后刀面及部分工件已加工表面，且铣刀侧后刀面空蚀程度远超工件已加工表面，为高速内冷切削加工过程中空蚀机理的研究提供依据。

The work aims to predict the occurrence of cavitation during high-speed internal cooling milling and reveal the failure mechanism of tool and the damage mechanism of the machined workpiece surface by cavitation. By combining 3D numerical analysis with experiment, the numerical calculation was carried out based on the establishment of the closed flow field of high speed internal cooling milling. The high-speed internal cooling cavitation platform was built and experiment was conducted. The machined surface of the segment dworkpiece was measured by the roughness tester. The morphologies of machined surface of the segmented workpiece and the milling cutter were analyzed by scanning electron microscopy. Through simulation, the gas content of the flow field was about 10% when a hole with diameter of f60 mm and depth of 50 mm was milled with a f40 mm milling cutter at 14,500 revolutions per minute. The cavitation was predicted during high speed internal cooling milling. The roughness Ra of the wedge-shaped divergent zone was from 0.311 to 0.478 mm, while the roughness Ra of the wedge-shaped constriction zone ranged from 0.138 to 0.317 mm after the cavitation experiment. There were small pockmarks and sponge-like cavitation pinholes in the surface of the machined workpiece, while honey comb and fish scale-shaped cavitation pits appeared in the flake side of the milling cutter. Therefore, the existence of the cavitation phenomenon can be validated in the high-speed internal cooling milling process through both simulation analysis and experiments. The cavitation may appear on the flank surface of the internal cooling milling cutter and some machined surface of workpieces, and the cavitation in the flank of the milling cutter is much severer than that in the machined surface of the workpiece, which provides a basis for the study of cavitation mechanism in the process of high-speed internal cooling cutting.