Method for repairing speed reduction gearbox hole

The invention discloses a method for repairing a speed reduction gearbox hole, belonging to the technical field of laser cladding. The method for repairing the speed reduction gearbox hole comprises the following steps of: (1) carrying out flaw detection on the surface and internal fissures of the whole speed reduction gearbox body; (2) remachining the hole by utilizing a boring mill, enlarging the aperture and exposing a new metal surface; and (3) impacting the speed reduction gearbox by using a multifunctional horizontal chuck, keeping the hole upward, synchronously carrying out powder feeding and laser cladding in a work step under the matching of the rotation motion of the chuck and the feeding motion of a linear shaft of a laser head Z, wherein the laser output power is 7kw, the scanning speed is 720mm/min and the powder feeding rate is 18g/min; and cladding the metal powder on the hole surface to form a laser reinforced layer with the cladding thickness of 2mm, wherein the laser beam is a circular facul