Method for manufacturing three-dimensionally shaped object and three-dimensionally shaped object

1. A method for manufacturing a three-dimensional shaped object, the method comprising the repeated steps of:

(i) forming a solidified layer by irradiating a predetermined portion of a powder layer with a light beam, thereby allowing a sintering of the powder in the predetermined portion or a melting and subsequent solidification thereof; and

(ii) forming another solidified layer by newly forming a powder layer on the resulting solidified layer, followed by the irradiation of a predetermined portion of the powder layer with the light beam,

wherein a heater element is disposed on the solidified layer during the repeated steps (i) and (ii), and thereby the heater element is situated within the three-dimensional shaped object,

wherein the forming of the powder layer and the solidified layer in the steps (i) and (ii) is performed on a supporting part for shaped object; and

a coil heater is used as the heater element, and the coil heater is disposed on the solidified layer via an opening of the supporting part.

2. The method according to claim 1 , wherein the heater element is disposed in a groove formed in stacked layers of the solidified layers.

3. The method according to claim 2 , wherein the groove is subjected to a machining process, and the heater element is disposed on the machined surface of the groove.

4. The method according to claim 2 , further comprising the step of filling the groove with a low-melting-point metal powder after disposing the heater element in the groove, wherein the low-melting-point metal powder is irradiated with the light beam, and thereby the groove is occupied by a solidified portion formed from the low-melting-point metal powder.

5. The method according to claim 4 , wherein the irradiation of the low-melting-point metal powder is performed with a light beam having less energy than that of the light beam irradiation with respect to the powder layer.

6. The method according to claim 5 , wherein an irradiation energy of the light beam with respect to the low-melting-point metal powder is rendered larger gradually as a powder portion to be irradiated is away from the heater element.

7. The method according to claim 4 , wherein, after the formation of the solidified portion, the machining process is performed with respect to the solidified portion and/or the solidified layer, and thereby a surface flatness thereof is provided.