Method and apparatus for producing three-dimensional objects

The present invention provides a method and apparatus for producing a three-dimensional object with a smooth outer surface without any step of removing a surface layer each time a sintered layer is formed, ready, so that a three-dimensional object is produced which composed of integrally sintered layers. The method may include the steps of: (i) feeding of powder particles (10) on a moving surface while the powder particles (10) are heated with heat (20) from a Warmmequelle with high energy density, so that a sintered layer (16) is formed, and (ii) feeding of powder particles (10) onto a moving surface on the sintered layer while the powder particles (10) are heated with heat (20) from the heat source having a high energy density, so that integrally formed on the sintered layer another sintered layer (18) is formed, wherein the step (ii) is repeated a predetermined number.