US 12,337,384 B2
Method and system for additive manufacturing
Michele De Chirico, Collegno (IT)
Assigned to PRIMA INDUSTRIE S.P.A., Collegno (IT)
Appl. No. 17/598,592
Filed by Prima Industrie S.p.A., Collegno (IT)
PCT Filed Mar. 20, 2020, PCT No. PCT/IB2020/052579
§ 371(c)(1), (2) Date Sep. 27, 2021,
PCT Pub. No. WO2020/194149, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 102019000004681 (IT), filed on Mar. 28, 2019.
Prior Publication US 2022/0176452 A1, Jun. 9, 2022
Int. Cl. B22F 10/28 (2021.01); B22F 10/25 (2021.01); B22F 10/36 (2021.01); B22F 10/366 (2021.01); B22F 10/85 (2021.01); B22F 12/41 (2021.01); B22F 12/46 (2021.01); B22F 12/53 (2021.01); B22F 12/55 (2021.01); B23K 26/08 (2014.01); B23K 26/082 (2014.01); B23K 26/144 (2014.01); B23K 26/342 (2014.01); B33Y 10/00 (2015.01); B33Y 30/00 (2015.01); B33Y 50/02 (2015.01)
CPC B22F 10/28 (2021.01) [B22F 10/25 (2021.01); B22F 10/36 (2021.01); B22F 10/366 (2021.01); B22F 10/85 (2021.01); B22F 12/41 (2021.01); B22F 12/46 (2021.01); B22F 12/53 (2021.01); B22F 12/55 (2021.01); B23K 26/082 (2015.10); B23K 26/342 (2015.10); B33Y 10/00 (2014.12); B33Y 30/00 (2014.12); B33Y 50/02 (2014.12); B23K 26/0869 (2013.01); B23K 26/144 (2015.10)] 13 Claims
OG exemplary drawing
 
1. A method for additive manufacturing,
wherein an additive-manufacturing head directs one or more jets of powders (PJ), wherein the powders comprise metal powders, onto a region (PD) of a working surface,
wherein said head simultaneously directs a laser beam (L) onto said region (PD), to form a focusing spot (LS) of the laser beam (L) on said region (PD), and
wherein, during direction of said one or more jets of powders (PJ) and of said laser beam (L) onto said region (PD), said additive-manufacturing head is simultaneously translated in a direction transverse to the direction of the laser beam (L) so as to give rise to a trace (MPP) obtained by melting of said powders as a result of power (D) transmitted to said powders (PJ) by said focusing spot (LS),
wherein, during translation of the additive-manufacturing head in said transverse direction, a dynamic movement with respect to the head is imparted on the laser beam (L) emitted by the head,
said dynamic movement being configured to obtain a width (c) of said trace (MPP) that is independent of the size of the focusing spot (LS) of the laser beam (L) and is equivalent to the one that would be produced by simple translation of an apparent spot having a width corresponding to the width (c) of the trace (MPP),
said dynamic movement being moreover configured in such a way that the distribution of the power (D) transmitted by the laser beam (L) to the trace (MPP) varies along the direction of the width (c) of the trace (MPP), wherein the movement imparted on the laser beam (L) is such that a central area of the trace receives from the laser beam (L) a lower power with respect to lateral areas of the trace so as to obtain the trace (MPP) having a pre-set and controlled depth (h) that is smaller than the width (c), notwithstanding the tendency of the powders to accumulate in the central area of the trace (MP, MP′).