The invention relates to the technical field of
selective laser melting, and discloses a
metal powder feeding mechanism for 3D printing, the
metal powder feeding mechanism comprises a forming driving module mounted in a
processing bin, the output end of the forming driving module is rotationally connected with a
processing base plate through an elastic rotating part, and a conveying mechanism for collecting
powder is arranged at the bottom of the
processing bin; a swinging powder collecting
assembly for collecting powder shaken off by rotation of the
machining base plate is installed outside the forming driving module, and the swinging powder collecting
assembly and the
machining base plate synchronously move through a swinging synchronous
assembly. A brand-new
metal powder feeding structure is arranged on the basis of gas-driven vertical blowing of the
machining base plate for inclined filtering, powder discharging, powder filtering and powder feeding are integrated, the equipment size is reduced, meanwhile, overturning of the bowl-shaped filtering cover is achieved through the inclined
kinetic energy of the machining base plate, procedure fusion is achieved, meanwhile, an additional filtering power source is not needed, and the equipment cost is reduced. And the problem of
filtration and accumulation of large-volume powder is solved in a small space range.