Groove machining method

The invention relates to a groove machining method. The groove machining method comprises the steps that firstly drawing side boundaries of a to-be-machined area on a blank; using a hard alloy square head groove blade to conduct rough machining on the blank to enable the hard alloy square head groove blade to move back and forth between two opposite side boundaries of the to-be-machined area; using a hard alloy round head groove blade to conduct finish machining on the blank to enable the hard alloy round head groove blade to move along the machined profile and machine the remaining allowance. By utilizing the technical scheme, different blades are used in the rough machining and finish machining stages, the blade swings back and forth in the to-be-machined area in rough machining, a combination of a straight line machining route and a curve machining route is utilized, the feed speed of the straight line machining route is high, the feed speed of the curve machining route is low, blade machining rigidity is