Vibration reduction type rough machining and milling method for runner cavity of high-hardness closed three-dimensional impeller

The invention relates to the technical field of vibration reduction type rough machining of a runner cavity of a high-hardness closed three-dimensional impeller, in particular to a vibration reduction type rough machining milling method for the runner cavity of the high-hardness closed three-dimensional impeller, according to the vibration reduction type rough machining milling method for the runner cavity of the high-hardness closed three-dimensional impeller, continuous cutting is conducted after spiral feed milling and cutting are conducted by a certain depth, so that a tool bit is uniform in stress and stable in cutting force, and the vibration reduction effect is achieved; meanwhile, thin-layer high-speed milling is adopted for continuous cutting, a high-speed milling cutter is matched, the feeding speed is high, the metal removal rate is increased, the cutting force is small, the torque is small, the frequency and times of damage to a machine tool spindle and an encoder are reduced, and the machining ef