Abstract:
L'invention concerne un procédé de fabrication d'une pièce comportant une formation de couches métalliques solides successives (20 1 ...20 n ), superposées les unes aux autres, chaque couche décrivant un motif défini à partir d'un modèle numérique ( M) , chaque couche étant formée par le dépôt d'un métal (25), dit métal d'apport, le métal d'apport étant soumis à un apport d'énergie de façon à entrer en fusion et à constituer, en se solidifiant, ladite couche, dans lequel le métal d'apport prend la forme d'une poudre (25), dont l'exposition à un faisceau énergétique (32) résulte en une fusion suivie d'une solidification de façon à former une couche solide (20 1 …20 n ), le procédé étant caractérisé en ce que le métal d'apport (25) est un alliage d'aluminium comprenant au moins les éléments d'alliage suivant : -Cr, selon une fraction massique comprise entre 2% et 10%; -Zr, selon une fraction massique comprise entre 0 et 5 %, de préférence entre 0,5 et 5%. L'invention concerne également une pièce obtenue par ce procédé. L'alliage utilisédans le procédé de fabrication additive selon l'invention, permet d'obtenir des pièces aux performances mécaniques remarquables, tout en obtenant un procédé dont la productivité est avantageuse.
Abstract:
An additive manufacturing system includes a platform to support an object to be fabricated, a dispenser to deliver a plurality of layers of a feed material over the platform, a controller configured to store digital data representing a pre-defined pattern, a laser configured to generate a laser beam to impinge an outermost layer of the feed material and coupled to the controller to fuse the feed material in the pre-defined pattern, and a plurality of independently controllable infrared lamps, each infrared lamp directed to a different section of an outermost layer of the feed material.
Abstract:
A method for producing a bonded permanent magnet, comprising: (i) incorporating a solid precursor material comprising a thermoplastic crosslinkable polymer and magnetic particles into an additive manufacturing device, wherein the crosslinkable polymer has a delayed crosslinking ability; (ii) melting the precursor material by heating it to a temperature of at least and no more than 10C above its glass transition temperature; (iii) extruding the melt through the additive manufacturing device and, as the extrudate exits from the nozzle and is deposited on a substrate as a solidified preform of a desired shape, exposing the resultant extrudate to a directional magnetic field of sufficient strength to align the magnetic particles; and (iv) curing the solidified preform by subjecting it to conditions that result in crosslinking of the thermoplastic crosslinkable polymer to convert it to a crosslinked thermoset. The resulting bonded permanent magnet and articles made thereof are also described.
Abstract:
Disclosed is a cartridge case for various caliber ammunition that consists essentially of a powdered metal and/or powdered metal alloy that is formed into the cartridge case through an injection mold processing. Also disclosed is a method for forming a cartridge case, which may include use of Metal Injection Molding ("MIM") processes to produce the cartridge case which retains a primer, propellant, and/or a bullet. The method can include metal injection molding an initial part, and also at least one of tapering and trimming the initial part to form the finished cartridge case. Further embodiments can include the use of Finite Element Method (FEM) analysis to develop an optimized MIM design.
Abstract:
Die vorliegende Erfindung betrifft Verfahren zum Verarbeiten eines legierten Einsatzstahls unter Ausbildung eines Bauteils, aufweisend die Verfahrensschritte: a) Bereitstellen eines Pulvers aus einem metallischen Werkstoff; und b) Formen eines Bauteils mittels eines additiven Fertigungsverfahrens aus dem bereitgestellten Pulver; wobei der metallische Werkstoff den Einsatzstahl umfasst, und wobei das Verfahren den weiteren Verfahrensschritt aufweist: c) Durchführen eines Niederdruckaufkohlens mit anschließendem Härten des geformten Bauteils.
Abstract:
A method for reconditioning of a wheel for a tracked vehicle by additive layer manufacturing is provided. The method includes the steps of using a heat source such as a laser to melt the surface of the wheel and form a weld pool; adding wire or metallic material to the weld pool and moving the heat source relative to the wheel so as to progressively form a new layer of metallic material on the wheel and repeating the above steps as required to form the recondition wheel layer by layer.
Abstract:
A method of forming a cutting element comprises disposing diamond particles in a container and disposing a metal powder on a side of the diamond particles. The diamond particles and the metal powder are sintered so as to form a polycrystalline diamond material and a low-carbon steel material comprising less than 0.02 weight percent carbon and comprising an intermetallic precipitate on a side of the polycrystalline diamond material. Related cutting elements and earth-boring tools are also disclosed.
Abstract:
A process for preparing alloy products is described using a self-sustaining or self-propagating SHS-type combustion process with point-source ignition, preferably a laser, in a pressurized vessel. Binary, ternary and quaternary alloys can be formed with control over polycrystalline structure and bandgap. Methods to tune the bandgap and the alloys formed are described. The alloy products may be doped. Preferably sulfides, tellurides or selenides are formed. Cooling during reaction takes place.
Abstract:
A continuous method of manufacturing permanent magnets and the permanent magnets created thereby. A fine powder is created from a combination of magnetic metals. The powder (a metal alloy) is placed in a non-magnetic container of any desired shape which could be, for example, a tube. The metal alloy and tube are swaged while a magnetic field is applied. Once swaging is complete, the metal alloy and tube are sintered and then cooled. Instead of sintering, a bonding agent can mixed into the powder. Following cooling, the metal alloy is magnetized by placing it between poles of powerful electromagnets with the desired field direction. The process of the invention enables mass-produced, cost- effective PM products, which are more robust, easily assembled into products, and enables new "wire-like" shapes with arbitrary magnetization direction. The process enables mass production of permanent magnets of any desired cross section, produces permanent magnets continuously that may be cut to any length, and may, in an embodiment, result in directional magnets
Abstract:
Verfahren zum Herstellen eines dreidimensionalen Objekts (2) durch schichtweises Aufbringen und selektives Verfestigen von Aufbaumaterial (15) mit dem Schritt des Aufbringens einer Schicht des Aufbaumaterials (15) auf eine Bauunterlage (10, 11,12) innerhalb eines Baufelds (8) und mit dem Schritt des selektiven Verfestigens der aufgebrachten Schicht durch Verfestigen eines Bereichs der aufgebrachten Schicht, der dem Querschnitt des Objekts (2) in der Schicht entspricht, zum Erzeugen eines verfestigten Bereichs in der Schicht. Die Schritte des Aufbringens und des selektiven Verfestigens werden wiederholt, bis das dreidimensionale Objekt (2) fertiggestellt ist. Wenigstens einmal während des Herstellens des dreidimensionalen Objekts (2) wird ein Teilbereich, der lediglich ein vorausbestimmter Teil des verfestigten Bereichs ist, nachbehandelt. Der Teilbereich liegt im Wesentlichen im Inneren des verfestigten Bereichs.