CPC B22F 12/67 (2021.01) [B22F 10/28 (2021.01); B22F 12/30 (2021.01); B22F 12/41 (2021.01); B22F 12/49 (2021.01); B22F 2998/10 (2013.01); B33Y 10/00 (2014.12); B33Y 30/00 (2014.12)] | 18 Claims |
1. A method of additive manufacturing comprising:
a material layer forming step of forming a material layer in a build region that is a region for forming a desired three-dimensional object; and
a solidifying step of forming a solidified layer by irradiating an irradiation region of the material layer with a laser beam or an electron beam through scanning performed with the laser beam or the electron beam in a predetermined scanning direction,
wherein the three-dimensional object is produced by laminating a plurality of solidified layers through repetition of the material layer forming step and the solidifying step for each of divided layers formed by dividing the three-dimensional object by a predetermined thickness,
wherein a stress controlled layer, which is one or more solidified layers of the plurality of solidified layers, is constituted to include a compressive stress applied part that is a region to which a compressive stress is applied and a compressive stress non-applied part that is a region different from the compressive stress applied part, and
wherein in the solidifying step, scanning of the laser beam or the electron beam is performed while the scanning direction for the compressive stress applied part is different from the scanning direction for the compressive stress non-applied part such that the compressive stress applied part expands further than the compressive stress non-applied part or the compressive stress non-applied part shrinks compared with the compressive stress applied part based on a relationship between the scanning direction and an expansion quantity or a shrinkage quantity at a time of temperature change or at a time of heat treatment;
wherein an expansion quantity of the solidified layer in a direction parallel to the scanning direction is larger than an expansion quantity of the solidified layer in a direction perpendicular to the scanning direction, or
a shrinkage quantity of the solidified layer in a direction parallel to the scanning direction is smaller than a shrinkage quantity of the solidified layer in a direction perpendicular to the scanning direction.
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