The utility model relates to the field of
laser 3D printing, and discloses a
laser melting forming
machining device which comprises a
laser transmission
pipe, a feeding box is fixedly connected to the periphery of the laser transmission
pipe, a connecting hose is arranged at the bottom of the feeding box, and a
laser nozzle is detachably connected to the bottom end of the connecting hose through a connecting
assembly. A laser groove is formed in the
laser nozzle, a
powder feeding groove is formed in the
laser nozzle, a threaded groove is formed in the periphery of the laser
nozzle, a rotating circular ring is in threaded connection with the periphery of the threaded groove, and an
extrusion circular ring is fixedly connected to the bottom of the rotating circular ring. According to the utility model, by arranging the structures such as the inclined surface convex block and the limiting block, the
extrusion circular ring is rotated to move up and down, and the
extrusion cylinder in the
powder feeding groove moves horizontally under the action of the limiting spring, so that the channel size of the
powder feeding groove can be conveniently controlled, and therefore, the powder feeding amount can be conveniently controlled, and the printing precision can be improved.