Extruded metal flow 3D printer
An extruded metal flow 3D printer comprising a rack including a workbench capable of moving along n X-axis and Y-axis direction, and a head capable of moving along an Z-axis direction; a printing device including a printing head, a high frequency coil and a high frequency electric induction heating device; the printing heal including a tungsten steel nozzle, a ceramic tube bank, a high temperature resistant ceramic protective sleeve, and a stainless steel end cover; the tungsten steel nozzle having an extrusion hole; a feeding device; the head comprising at least one laser mounted on a lower end face thereof and configured to locally preheat and melt a metal layer printed from the metal wire or enhance a binding force between metal layers, so that the print effect and model molding effect of the present invention can be improved, enhancing the marketability.
1. An extruded metal flow 3D printer comprising:
a frame ( 1 ) including a workbench ( 2 ) capable of moving along an X-axis and Y-axis direction, and a head ( 3 ) capable of moving along a Z-axis direction;
a printing device ( 4 ) including a printing head ( 42 ) fixed in the head ( 3 ) via a connecting base ( 41 ), a high frequency coil ( 43 ) and a high frequency electric induction heating device ( 44 ) for heating the printing head ( 42 ), the printing head ( 42 ) including a tungsten steel nozzle ( 46 ), a ceramic tube bank ( 47 ) disposed, inside the tungsten steel nozzle ( 46 ), a high temperature resistant ceramic protective sleeve ( 48 ) sleeved on an external, surface of the tungsten steel nozzle ( 46 ), and a stainless steel end cover ( 49 ) covered on an upper end of the tungsten steel nozzle ( 46 ); the tungsten steel nozzle ( 46 ) having an extrusion hole ( 464 );
a feeder ( 5 ) mounted on the frame ( 1 ) and configured to convey a metal wire to the printing device ( 4 ),
wherein the head ( 3 ) comprises at least one laser ( 31 ) mounted on a lower end face thereof and configured to locally preheat and melt a metal layer printed by the metal wire or enhance a binding force between the metal layers; the laser ( 31 ) is tilted, and a light beam irradiated from the laser ( 31 ) is focused under the printing head ( 42 ); the frame ( 1 ) further comprises an inert gas feeder ( 6 ) mounted thereon and configured to supply inert gas to the printing head ( 42 ), so that the printing head ( 42 ) can jet inert gas;
wherein the feeder ( 5 ) comprises a wire reel ( 51 ) disposed on the frame ( 1 ) and configured to place the metal wire, a first servomotor ( 52 ) configured to rotate the wire reel ( 51 ), a second servomotor ( 53 ) disposed in the head ( 3 ), a wire guide base ( 54 ) disposed at a front end of the second servomotor ( 53 ); the wire guide base ( 54 ) includes a wire pressing wheel ( 55 ) and an active wire feeding wheel ( 531 ) disposed therein; the active wire feeding wheel ( 531 ) and wire pressing wheel ( 55 ) convey the metal wire jointly.
2. The extruded metal flow 3D printer according to claim 1 , wherein the laser ( 31 ) is a fiber optic coupling laser; there are two fiber optic coupling lasers, located on both sides of the printing head ( 42 ) respectively; the cross point of the light beams irradiated from the lasers ( 31 ) is straight under the printing head ( 42 ).
3. The extruded metal flow 3D printer according to 3, wherein the wire guide base ( 54 ) comprises an opening ( 541 ) disposed in a middle thereof, an adjustable elastic mounting base ( 542 ) disposed on one side of the wire guide base ( 54 );
the wire pressing wheel ( 55 ) is mounted in the elastic mounting base ( 542 ), and its outer edge is exposed in the opening ( 541 ); the active wire feeding wheel ( 531 ) is mounted on a shaft of the second servomotor ( 53 ) and exposed in the opening ( 541 ); a gap is formed between the active wire feeding wheel ( 531 ) and the wire pressing wheel ( 55 ) for clamping the conveyed metal wire; the wire guide base ( 54 ) includes through holes respectively disposed on an upper end and lower end thereof and corresponding to the gap; the through hole corresponds to a hole disposed on the printing head ( 42 ) and provided for the metal wire passing therethrough; the wire pressing wheel ( 55 ) is formed with a ring groove disposed on an outer surface thereof and configured to clamp the metal wire.
4. The extruded metal flow 3D printer according to claim 1 , wherein the inert gas feeder ( 6 ) comprises a gas tank ( 61 ) mounted outside the frame ( 1 ), a regulating valve ( 62 ), and a gas tube; the gas tube is extended into the head ( 3 ) and connected to a cooling hole disposed in the printing head ( 42 ) and configured to jet inert gas; the connecting base ( 41 ) comprises a recess ( 411 ) disposed at a front end thereof and provided for the printing head ( 42 ) installed therein, and a gas orifice ( 412 ) disposed at a rear end thereof and provided for the recess ( 411 ) connected therewith; the gas orifice ( 412 ) is connected to the gas tube.
5. The extruded metal flow 3D printer according to claim 1 , wherein the tungsten steel nozzle ( 46 ) comprises an annular mounting part ( 461 ) disposed at an upper end thereof, a collar flange ( 462 ) disposed at a lower end thereof, and a conical end ( 463 ) formed at a lower end of the collar flange ( 462 ) and having the extrusion hole ( 464 ); an aperture of the extrusion hole ( 464 ) is smaller than the diameter of metal wire.
6. The extruded metal flow 3D printer according to claim 5 , wherein the ceramic tube bank ( 47 ) comprises an inner ceramic tube ( 471 ) and an outer ceramic tube ( 472 ) nested with each other and mounted in a holding position ( 460 ) in an inner chamber of the tungsten steel nozzle ( 46 ); the inner ceramic tube ( 471 ) having an upper end face is even with an upper end face of the outer ceramic tube ( 472 ); the inner ceramic tube ( 471 ) having a lower end is extended out of a lower end face of the outer ceramic tube ( 472 ) and connected to the extrusion hole ( 464 ) of the tungsten steel nozzle ( 46 ); the inner ceramic tube ( 471 ) having an outer wall and the outer ceramic tube ( 472 ) having an inner wall are formed with a first space disposed therebetween; the outer ceramic tube ( 472 ) having an outer wall and the holding position ( 460 ) having an inner wall are formed with a second space disposed therebetween; the, stainless steel end cover ( 49 ) includes a wire entrance hole ( 491 ) corresponding to the inner ceramic tube ( 471 ).
7. The extruded metal flow 3D printer according to claim 6 , wherein the high temperature resistant ceramic protective sleeve ( 48 ) is sleeved on the external surface of tungsten steel nozzle ( 46 ) and contacted with the collar flange ( 462 ) at the lower end of tungsten steel nozzle ( 46 );
the high temperature resistant ceramic protective sleeve ( 48 ) and an outer wall of tungsten steel nozzle ( 46 ) comprises a plurality of passages disposed therebetween for gas passing therethrough;
the tungsten steel nozzle ( 46 ) includes a plurality of tilted gas blow-out holes ( 465 ) disposed at the collar flange ( 462 ) and connected to the passages;
the high temperature resistant ceramic protective sleeve ( 48 ) includes a clearance groove ( 481 ) arranged in a lower end of an inner wall thereof and engaged with the gas blow-out hole ( 465 ).
8. The extruded metal flow 3D printer according to claim 7 , wherein the tungsten steel nozzle ( 46 ) comprises a plurality of spaced first annular bulges ( 467 ) formed under the annular mounting position ( 461 ), a plurality of second annular bulges ( 468 ) disposed at the lower end thereof and corresponding to the first annular bulge ( 467 ) for the high temperature resistant ceramic protective sleeve ( 48 ) being concentrically sleeved on the external surface of tungsten steel nozzle, ( 46 ) to form said passage, and a plurality of gas guide grooves ( 469 ) opened downward under the annular mounting position ( 461 ) thereof for the annular mounting position ( 461 ) being connected to the passage;
the first annular bulge ( 468 ) is located between two adjacent gas guide grooves ( 469 ).
9. The extruded metal flow 3D printer according to claim 1 , wherein the frame further comprises a water-cooling plant ( 7 ) disposed thereon; the high frequency coil ( 43 ) having a copper pipe is formed with a flow channel for cold water passing therethrough; the water-cooling plant ( 7 ) is connected to the flow channel via a pipe.