# US 2025/0083254 A1 · Additive manufactured object production method, and additive manufactured object production system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0083254 A1 - Document ID: US20250083254A1 - Status: Published application - Kind: A1 - Application number: 18/292,472 - Filed: 2022-04-19 - Published: 2025-03-13 - Earliest claimed: 2021-07-30 - Assignees: Mitsubishi Heavy Industries, Ltd. - Applicants: Mitsubishi Heavy Industries, Ltd. - Inventors: Shuho Tsubota; Masahiro Kimura; Tomoharu Tamaru; Yusuke Sano; Yasutaka Banno - Web page: https://patentgrep.com/patent/US20250083254A1 ## CPC - B23K 26/342: Build-up welding - B22F 10/22: Direct deposition of molten metal - B22F 10/25: Direct deposition of metal particles, e.g. direct metal deposition [DMD] or laser engineered net shaping [LENS] - B22F 10/28: Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM] - B22F 10/38: to achieve specific product aspects, e.g. surface smoothness, density, porosity or hollow structures - B22F 10/85: for controlling or regulating additive manufacturing processes - B22F 12/90: Means for process control, e.g. cameras or sensors - B23K 9/04: Welding for other purposes than joining, e.g. built-up welding - B23K 15/0086: {welding for purposes other than joining, e.g. build-up welding} - B23K 26/144: the fluid stream containing particles, e.g. powder - B23K 26/1476: {Features inside the nozzle for feeding the fluid stream through the nozzle} - B33Y 10/00: Processes of additive manufacturing - B33Y 30/00: Apparatus for additive manufacturing; Details thereof or accessories therefor - B33Y 50/02: for controlling or regulating additive manufacturing processes - B22F 10/66: by mechanical means - B22F 12/41: characterised by the type, e.g. laser or electron beam - B22F 12/44: characterised by the configuration of the radiation means - Y02P 10/25: Process efficiency - B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM - B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER - B33Y: ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract An additive manufactured object production method includes: a core portion forming step of additively forming a core portion as an inner portion of an additive manufactured object by stacking first weld beads each size of which is corresponding to a first resolution; and a shell portion forming step of additively forming a shell portion as an outer portion of the additive manufactured object on a surface of the core portion by stacking second weld beads each size of which is corresponding to a second resolution higher than the first resolution after the core portion forming step. ## Claims ### Claim 1 A production method for additive manufactured object, the method comprising: a core portion forming step of additively forming a core portion as an inner portion of an additive manufactured object by stacking first weld beads each size of which is corresponding to a first resolution; and a shell portion forming step of additively forming a shell portion as an outer portion of the additive manufactured object on a surface of the core portion by stacking second weld beads each size of which is corresponding to a second resolution higher than the first resolution after the core portion forming step. ### Claim 2 (depends on 1) The production method according to claim 1, wherein the core portion forming step includes: an outer part forming step of forming an outer part of the core portion, which has the surface of the core portion, by stacking third weld beads each corresponding to a third resolution higher than the first resolution; and an inner part forming step of additively forming an inner part of the core portion inside the outer part by stacking the first weld beads each corresponding to the first resolution after the outer-skin forming step. ### Claim 3 (depends on 1) The production method according to claim 1, further comprising: a region specifying step of specifying a core region in which the core portion is to be formed and a shell region in which the shell portion is to be formed with aiming at a final shape of the additive manufactured object before the core portion forming step, wherein in the core portion forming step, the core portion is additively formed in the core region specified by the region specifying step, and wherein in the shell portion forming step, the shell portion is additively formed in the shell region specified by the region specifying step. ### Claim 4 (depends on 1) The production method according to claim 1, further comprising: an accuracy determining step of determining the accuracy of the surface of the core portion at a time between the core portion forming step and the shell portion forming step, wherein the shell portion forming step is performed only when the accuracy is determined to be inappropriate in the accuracy determining step. ### Claim 5 (depends on 1) The production method according to claim 1, wherein the core portion forming step and the shell portion forming step are performed by laser welding or electron beam welding. ### Claim 6 (depends on 1) The production method according to claim 1, wherein the core portion forming step and the shell portion forming step are performed by arc welding. ### Claim 7 A production system for additive manufactured object, the system comprising: a welding head; and an additive forming control device which is configured to control the welding head so that an additive manufactured object is formed by operating the welding head, wherein the additive forming control device includes: a core portion forming control unit which is configured to control the welding head so that a core portion as an inner portion of the additive manufactured object is additively formed by stacking first weld beads each size of which is corresponding to a first resolution; and a shell portion forming control unit which is configured to control the welding head so that a shell portion as an outer portion of the additive manufactured object is additively formed on a surface of the core portion by stacking second weld beads each size of which is corresponding to a second resolution higher than the first resolution after at least part of the core portion is additively formed. ### Claim 8 (depends on 7) The production system according to claim 7, wherein the core portion forming control unit controls the welding head so that an outer part of the core portion, which has the surface of the core portion, is additively formed by stacking third weld beads each size of which is corresponding to a third resolution higher than the first resolution, and controls the welding head so that an inner part of the core portion is additively formed inside the outer part 13 by stacking the first weld beads each size of which is corresponding to the first resolution after the outer part is additively formed. ### Claim 9 (depends on 7) The production system according to claim 7, wherein the additive forming control device further includes a region specifying unit which is configured to specify a core region in which the core portion is to be formed and a shell region in which the shell portion is to be formed with aiming at a final shape of the additive manufactured object, wherein the core portion forming control unit controls the welding head so that the core portion is additively formed in the core region specified by the region specifying unit, and wherein the shell portion forming control unit controls the welding head so that the shell portion is additively formed in the shell region specified by the region specifying unit. ### Claim 10 (depends on 7) The production system according to claim 7, further comprising a condition detection unit which is configured to detect a surface condition of the core portion, wherein the additive forming control device further includes an accuracy determination unit which is configured to determine the accuracy of the surface of the core portion on the basis of the detection result of the condition detection unit, and wherein the shell portion forming control unit controls the welding head so that the shell portion is additively formed only when the accuracy is determined to be inappropriate in the accuracy determination unit. ### Claim 11 (depends on 7) The production system according to claim 7, wherein the welding head is a laser welding head performing an additive formation with laser welding or an electron beam forming head performing an additive formation with electron beam welding. ### Claim 12 (depends on 7) The production system according to claim 7, wherein the welding head is an arc welding head performing an additive formation with arc welding.