Metal three-dimensional printer

A metal three-dimensional printer, comprising:

• a printing head, wherein the printing head contains a three-dimensional printing material, the three-dimensional printing material comprises metal powder and a binder, and a weight percentage of the metal powder in the three-dimensional printing material is more than 60%;
• the printing head comprises a guide tube, a throat tube, and a printing nozzle that are sequentially communicated, and a strip-shaped printing material passes through the guide tube and the throat tube;
• a heating apparatus, configured to heat the three-dimensional printing material in the printing head, and a heating temperature of the heating apparatus is controlled between 50° C. and 300° C., and the binder bonds the metal powder at 50° C. to 300° C.;
• a printing platform, configured to bear the three-dimensional printing material extruded by the printing head, to form a preliminary cured object, wherein the printing head can perform movement in a three-directional direction with respect to the printing platform;
• and
• a sintering shaping chamber, configured to perform sintering shaping on the preliminary cured object,
• wherein the printing head has a printing head chamber, a screw, and a feed inlet, and wherein the feed inlet is disposed on an upstream section of the printing head chamber, the printing nozzle is provided on a downstream end of the printing head chamber, the screw is rotatably disposed in the printing head chamber, and the heating apparatus is disposed on an inner wall or an outer wall of the printing head chamber.