Three-dimensional manufacturing method and three-dimensional manufacturing apparatus

A three-dimensional manufacturing method which is to perform three-dimensional manufacturing by repeating a step of forming a solidified layer by irradiating an energy beam to a manufacturing material on a manufacturing table, the method comprising:

• a layer forming step of forming a layer of the manufacturing material on the manufacturing table;
• and
• a heating step of alternately moving an energy beam on a solidified region formed by fusing and solidifying, with the irradiating of the energy beam, the layer formed in the layer forming step and on a powder region in which the manufacturing material is not fused, the powder region being adjacent to the solidified region, thereby integrally fusing and solidifying the solidified region and the powder region,
• wherein, in the heating step, a heating amount of the energy beam per unit area of the powder region is smaller than a heating amount of the energy beam per unit area of the solidified region.

A three-dimensional manufacturing apparatus comprising:

• a layer forming unit configured to form a layer of material powder;
• a heating unit configured to heat, with a laser beam, the layer formed by the layer forming unit;
• and
• a controlling unit configured to cause the layer forming unit to form the layer, and to cause the heating unit to heat the layer,
• wherein the controlling unit is configured to cause the energy beam to move alternately on a solidified region obtained by fusing and solidifying the layer and on a powder region in which the material powder is not fused, the powder region being adjacent to the solidified, thereby integrally fusing and solidifying the solidified region and the powder region, and
• wherein a heating amount of the energy beam per unit area of the powder region is smaller than a heating amount of the energy beam per unit area of the solidified region.

A three-dimensional manufacturing apparatus which performs three-dimensional manufacturing by repeating a step of forming a solidified layer by irradiating an energy beam to a manufacturing material on a manufacturing table, the apparatus comprising:

• a layer forming unit configured to form a layer of the manufacturing material on the manufacturing table;
• a heating unit configured to heat, by irradiating the energy beam, the layer formed by the layer forming unit;
• and
• a controlling unit configured to control the irradiating of the energy beam to the layer formed by the layer forming unit,
• wherein the controlling unit is configured to control the heating unit to alternately move the energy beam on a solidified region formed by fusing and solidifying, with the irradiating of the energy beam, the layer and on a powder region in which the manufacturing material is not fused, the powder region being adjacent to the solidified, thereby integrally fusing and solidifying the solidified region and the powder region, and
• wherein a heating amount of the energy beam per unit area of the powder region is smaller than a heating amount of the energy beam per unit area of the solidified region.