Method for carrying out blade modification by using three-axis machine tool

The invention discloses a method for patching a blade by using a three-axis machine tool, which relates to the field of blade patching and is characterized in that the three-axis machine tool is used for patching the blade of an impeller, and the patching position is located at the tip of the blade; comprising the following steps: inputting a model; an impeller to be modified is clamped on a rotary table of the three-axis machine tool; establishing a processing coordinate system in the processing software; creating a plurality of correction points on the impeller design model in the processing software; a photoelectric edge finder is used for correcting the to-be-corrected impeller one by one according to the correction points; a cutter is mounted on the milling head; the angle head of the milling head is adjusted, so that the axis of the cutter coincides with the axis of the cutter model in the machining software; and the three-axis machine tool is started, and the three-axis machine tool conducts multiple t