Abstract: An additive manufacturing machine (10) comprises a working plane (18) comprising a working zone (20) allowing an overlay of different layers of powder to be received, and a powder dispensing device (32) comprising a powder intake (36) allowing powder to be delivered on top of the working plane. The powder dispensing device (32) comprises a tank (44) of powder mounted to move above the working plane (18) and that can be displaced to under the powder intake (36), the bottom part (45) of the tank (44) comprises a powder dispensing point (P1), and the powder dispensing device (32) comprises a control device (48) controlling the flow of powder via the powder dispensing point during a displacement of the tank. The tank (44) is mounted on a weighing sensor (68).

Abstract: A powder bed fusion additive manufacturing machine (10) comprises: a manufacturing chamber (12), at least one mobile powder-receiving surface (28) and a manufacturing zone (20) situated inside the manufacturing chamber, a powder-spreading device (30), and at least one powder-distribution device (32) distributing powder over the mobile receiving surface. The distribution device comprises a buffer reservoir (40) connected to a powder supply (42), and a powder-distribution point (P1) beneath which a mobile receiving surface (28) moves, and the powder-distribution device comprises a screw-type metering device (44) connecting the buffer reservoir (40) and the powder-distribution point (P1) and enabling the generation of a continuous stream of powder from the buffer reservoir towards the powder-distribution point.

Abstract: Disclosed is a switching system for a facility for 3D printing by spraying at least a first powder, including a body defining: at least one first upstream gas conduit configured to receive a gas; at least one first upstream powder conduit configured to receive the first powder; at least one first downstream discharge conduit for discharging the first powder; and a downstream work conduit configured in order to supply a nozzle designed for depositing at least the first powder. The system further includes a distributor that is movable with respect to the body, preferably in rotation about an axis, between a rest position, in which the first upstream powder conduit is fluidly connected, via the distributor, to the first downstream discharge conduit, and at least a first supply position, in which the first upstream powder conduit is fluidly connected, via the distributor, to the downstream work conduit.

Abstract: A device for metering one or more powder(s) (A, B) to produce a flow (23) of powder(s) and of a carrier gas at a given volume flow rate, comprises: ?at least a first source (25) suitable for supplying a first flow (27) comprising a first powder (A) and a first carrier gas (G1) substantially at the given volume flow rate, ?a source (33) of a carrier gas suitable for supplying an adjustment carrier gas flow (35) substantially at the given volume flow rate, ?an outlet junction (49) for emitting said flow of powder(s) and of carrier gas, ?a first proportional valve (59), ?an adjustment proportional valve (75), and ?a control system (21) suitable for controlling at least the first proportional valve and the adjustment proportional valve so that the flow of powder(s) and of carrier gas has a volume flow rate substantially equal to the given volume flow rate.

Abstract: An assembly for calibrating a head system of a power radiation source of an additive manufacturing apparatus comprises: a calibration plate comprising a plurality of reference marks, and a firing medium made of at least one material that is sensitive to the radiation of the source, this medium leaving visible the reference marks of the calibration plate when it is in place on the latter, characterized in that the firing medium comprises a plurality of windows that are distributed so as to be superposed with the various reference marks of the calibration plate and to leave said marks visible when the firing medium is in place on the calibration plate. There is also a method for calibrating such a system.

Abstract: A kit for the calibration of a head system of a power radiation source of an additive manufacturing device comprises: a calibration plate having a plurality of reference marks, and a firing support made from at least one material sensitive to the radiation of the source, this support leaving the reference marks of the calibration plate visible when it is in place thereon, characterized in that the firing support comprises a plurality of windows distributed in such a way as to become superposed with the various reference marks of the calibration plate and leave them visible when the firing support is in place on the calibration plate. There is also a method for calibrating such a system.

Abstract: An additive manufacturing machine (10) comprises at least one movable powder reception surface (28) capable of being displaced in proximity to a manufacturing zone (20), a powder spreading device (30), and a device (32) for distributing powder on the movable reception surface. The powder distribution device comprises a buffer tank (38) linked to a powder supply (40) and a distribution duct (42) linking the buffer tank to a powder distribution point (P1) situated above the movable reception surface, and the distribution duct (42) is mounted on a vibrating device making it possible to vibrate the distribution duct so as to generate a continuous flow of powder in the distribution duct and from the buffer tank to the powder distribution point.

Abstract: A process for the additive manufacture of a part within a machine, the machine including a working surface, a device for spreading the powder layer along at least one longitudinal horizontal direction, at least one injector of powder over the working surface, the injector being movable with respect to the working surface along at least one transverse horizontal direction, and a system for regulating the amount of powder dispensed by the injector, the process including the following stages: moving the injector along a trajectory comprising at least one component parallel to the transverse horizontal direction; and regulating the amount of powder dispensed by the injector at any point of the trajectory of the injector.

Abstract: A method is provided for producing a three-dimensional object that includes an external skin, a 3D mesh enclosed in the skin and having a portion that penetrates at least a part of a thickness of the skin, and an unmelted portion enclosed in the skin. The object is formed from superposed layers each including an outer edge and an inner mesh, with the superposed outer edges forming the skin, and with the superposed inner meshes forming the 3D mesh. Each superposed layer is formed by scanning a powder layer using an energy beam to form micro-connections between grains of the powder without melting the metal powder. First and second melting and solidifying steps are performed using the energy beam to form the outer edge in one of the first and second steps and the inner mesh in the other of the first and second steps.

Abstract: Nut (1) for moving a strip for transporting powder in a selective additive manufacturing apparatus, having a tapped hole (2) extending along a first axis (A), characterized in that it comprises a slot (3a, 3b) which passes through the thickness of the nut from an external surface of the nut (1) to the internal surface (5) of the tapped hole (2) and which extends along a plane passing through the first axis (A) over at least one thread pitch (6) of the tapped hole (2).

Abstract: A method and a device are provided for removing surface oxides on nodules of a metal powder, before the nodules of the metal powder are used in an industrial process in which the nodules of the metal powder are assembled via a solid route or via a liquid route. In the method and the device, the surface oxides are stripped from the nodules of the metal powder by bringing the nodules of the metal powder into contact with vapour from at least one of: sublimation of a stripping solid material, and sublimation of the stripping solid material followed by a chemical transformation of a product of the sublimation.

Abstract: An additive manufacturing machine (10) comprises: a manufacturing chamber (12), the manufacturing chamber being formed by at least one working plane (20), a front wall (22), a rear wall (24), a left-hand lateral wall (26), a right-hand lateral wall, and an upper wall (30), at least one of these walls supporting a source of energy or heat (14); an inner skin (32) that is positioned inside the manufacturing chamber (12) in front of each wall of this chamber supporting the source of energy or heat (14) and at a non-zero distance from these walls so as to create a circulation volume (V) for a flow of gas (F); and a device (52) for generating the flow of gas (F) that is connected to the circulation volume (V).

Abstract: A machine is provided for the additive manufacture of a part by complete or partial selective melting of a powder, the machine including: a horizontal working plane; at least one spreading device; at least one system for dispensing powder over the working plane comprising at least one slide for receiving powder and at least one powder injector, the receiving slide being movable in translation, with respect to the working plane, and the injector being positioned above the receiving slide, so as to dispense powder over the receiving slide which is moving between a retracted position and a deployed position.

Abstract: A machine (1) for the additive manufacture of a component (2) by complete or partial selective melting of a powder comprises: a working chamber (100); a sleeve (3) having a top opening (4) opening into the working chamber (100), and having a vertical central axis (5), a support plate (6) intended to accept the component (2) in the process of being manufactured, a device (7) for actuating the translational movement of the support plate (6) inside the sleeve (3) along the vertical central axis (5) of the sleeve (3), and a component (2) extraction system (8) comprising a container (9), the extraction system (8) further comprising at least one closure plate (12) that is able to move in order to close the bottom opening (15) of the container (9), and the attachment between the support plate (6) and the actuating device (7) being of the removable type.

Abstract: A mobile additive manufacturing installation (10) comprises a main self-supporting frame (12), a main manufacturing housing (14), at least one main additive manufacturing machine (M1) installed inside the main manufacturing housing, a main inerting device (26), a main circulation path and a main airlock (34). The mobile installation also comprises at least one auxiliary manufacturing housing connected to the main manufacturing housing (14), at least one auxiliary additive manufacturing machine (M2, M3) being installed in this auxiliary manufacturing housing, an auxiliary self-supporting frame (112) supporting this auxiliary manufacturing housing and independent of the main self-supporting frame (12), and an auxiliary circulation path (132) being provided in the auxiliary manufacturing housing.

Abstract: A mobile additive manufacturing installation (10) comprises a main self-supporting frame, a main manufacturing housing (14) closed in leaktight fashion, at least one main additive manufacturing machine (M1) installed in the main manufacturing housing, a main inerting device (26), a main circulation path (32) in the main manufacturing housing (14), a main airlock (34), and a main device (42) for treatment of the air circulating inside the main manufacturing housing (14). The main treatment device (42) makes it possible to supply the inside of the main manufacturing housing (14) with air withdrawn outside the installation, to withdraw the air present in the main manufacturing housing (14) and in the main airlock (34), and to manage the pressure of the air present in the main manufacturing housing (14) and in the main airlock (34).