US 11,833,746 B2
Method for producing three-dimensional molded object and lamination molding apparatus
Yasuyuki Miyashita, Yokohama (JP)
Assigned to Sodick Co., Ltd., Yokohama (JP)
Filed by Sodick Co., Ltd., Kanagawa (JP)
Filed on May 21, 2020, as Appl. No. 16/880,005.
Claims priority of application No. 2019-107199 (JP), filed on Jun. 7, 2019.
Prior Publication US 2020/0384686 A1, Dec. 10, 2020
Int. Cl. B29C 67/00 (2017.01); B29C 64/147 (2017.01); B29C 64/268 (2017.01); B29C 64/343 (2017.01); B29C 64/393 (2017.01); B33Y 10/00 (2015.01); B29C 64/371 (2017.01); B33Y 50/02 (2015.01); B29C 64/245 (2017.01); B29C 64/25 (2017.01); B29C 64/209 (2017.01); B33Y 30/00 (2015.01)
CPC B29C 64/147 (2017.08) [B29C 64/268 (2017.08); B29C 64/343 (2017.08); B29C 64/393 (2017.08); B29C 64/209 (2017.08); B29C 64/245 (2017.08); B29C 64/25 (2017.08); B29C 64/371 (2017.08); B33Y 10/00 (2014.12); B33Y 30/00 (2014.12); B33Y 50/02 (2014.12)] 8 Claims
OG exemplary drawing
 
1. A method for producing a three-dimensional molded object, comprising:
forming a solidified layer by irradiating an irradiation region of a material layer with a laser beam or an electron beam;
obtaining data about projections having a height higher than a predetermined value formed on a surface of the solidified layer;
calculating heights of the projections, an area of the projections, or the number of the projections based on the data; and
determining an internal state of the solidified layer by making a comparison between the calculated heights of the projections and a first threshold relating to heights of the projections, between the calculated area of the projections and a second threshold relating to an area of the projections, or between the calculated number of the projections and a third threshold relating to the number of the projections;
molding a test piece under the same condition as a condition under which the three-dimensional molded object is molded, before forming the solidified layer;
obtaining data about projections formed on at least a part of a surface of a solidified layer of the test piece; and
calculating the first threshold, the second threshold, or the third threshold based on the data about the projections of the test piece and an internal state of the test piece as confirmed by cutting the test piece.