The invention discloses an efficient and long-service-life hydraulic valve main hole
machining method, and belongs to the hole
machining technology field. In the
machining method, an oil port three-blade forming cutter, a three-blade chambering cutter and an eight-blade expanding
reamer are sequentially used for machining a main hole of a hydraulic valve. One-time forming of a forming hole is guaranteed through the oil port three-blade forming cutter, a service life is long, and
cutting efficiency is high. An unequal design of the three-blade chambering cutter is matched with a
layered structure design so that chambering
cutting vibration is reduced, a chambering machining allowance is large, concentricity of the main hole of an intermittent hydraulic valve is ensured, and machining precision and machining efficiency are high. Unequal parts of the eight-blade expanding
reamer are combined with unequal teeth so that vibration of a cutter of expanding and reaming is greatly reduced, andsurface roughness and cylindricity of the main hole of the hydraulic valve, the reaming
processing allowance and the
cutting efficiency are improved; and the method has the advantages of high machining efficiency, good machining precision, a long service life of the cutter and the like, and a problem that hydraulic valves are scrapped due to blockage of ducts by residual cuttings is effectively solved.