Cutting machining method for groove of thin-wall guide sleeve

The invention provides a thin-wall guide sleeve groove cutting machining method, a special cutter is adopted for machining, the special cutter comprises a cutter body and a cutting part, and the head of the cutting part is provided with an open groove and two cutting edges. The cutting part is provided with two convex edges, a first chip breaking groove and two second chip breaking grooves on the side surfaces of the front cutter surfaces of the two cutting edges, and the method comprises the following steps of: roughly turning the groove of the thin-wall guide sleeve, and reserving 0.2-0.25 mm machining allowance; the cutting part feeds from the first groove wall of the groove to ensure that the cutting part is perpendicular to the groove bottom, and finish turning is performed on the first groove wall until the cutting edge advances to the groove bottom, so that a boss is formed in the open type groove; retracting the cutter; the cutting part feeds from the second groove wall of the groove to guarantee that