Method for manufacturing three-dimensional shaped object

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

(i) forming a powder layer on a base plate by a sliding movement of a squeegee blade, followed by forming a solidified layer by irradiating a predetermined portion of the powder layer with a light beam, thereby allowing sintering of the powder of the predetermined portion or melting and subsequent solidification thereof; and

(ii) forming another solidified layer by newly forming a powder layer on the solidified layer, and then irradiating another predetermined portion of the new powder layer with the light beam, and repeatedly performing (i) and (ii),

wherein machining is performed at least one time on a side surface of a shaped object precursor obtained during manufacturing the three-dimensional shaped object,

wherein upper face machining of the solidified layer is performed to remove a raised solidified portion generated at a contour region of the solidified layer without first detecting the raised solidified portion, the raised solidified portion being generated due to irradiating both a portion of a powder layer newly overlaid on the solidified layer and a portion of a powder layer that is newly overlaid on another powder layer, the contour region being located at a boundary between an upper face of the solidified layer and a side face of the solidified layer, the upper face being disposed parallel to a surface of the base plate on which the powder layer to be irradiated with the light beam is formed,

wherein, after the machining is performed on the side surface of the shaped object precursor, the light beam is irradiated at a boundary between the portion of the powder layer newly overlaid on the solidified layer and the portion of the powder layer that is newly overlaid on the other powder layer not having the solidified layer underneath as its base to form the raised solidified portion, the boundary between the portions of the powder layers being formed by the machining of the side surface,

wherein the upper face machining is performed on only the contour region of the solidified layer, and

wherein the raised solidified portion is raised above a portion of the power layer that is not irradiated.

2. The method for manufacturing a three-dimensional shaped object according to claim 1 , wherein the solidified region for the upper face machining is formed of a plurality of sub-solidified regions,

wherein a machining time A for locally performing the upper face machining only on contour regions of each of the sub-solidified regions of the solidified layer and a machining time B for entirely performing the upper face machining by moving a cutting tool not only to the contour regions of each of the sub-solidified regions of the solidified layer but also to other upper surface regions are determined,

wherein subsequently the upper face machining having the machining time A or B, whichever is shorter, is performed, and

wherein each of the contour regions is located at a boundary between an upper face of the sub-solidified regions and a side face of the sub-solidified regions.

3. The method for manufacturing a three-dimensional shaped object according to claim 1 , wherein the upper face machining is performed to remove the raised solidified portion interrupting the sliding movement of the squeegee blade.

4. The method for manufacturing a three-dimensional shaped object according to claim 1 , wherein every time one solidified layer is formed after the machining of the side surface of the shaped object precursor, the upper face machining is performed on the raised solidified portion.