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Spray forming, also known as spray casting, spray deposition and in-situ compaction, is a method of casting near net shape metal components with homogeneous microstructures via the deposition of semi-solid sprayed droplets onto a shaped substrate. In spray forming an alloy is melted, normally in an induction furnace, then the molten metal is slowly poured through a conical tundish into a small-bore ceramic nozzle. The molten metal exits the furnace as a thin free-falling stream and is broken up into droplets by an annular array of gas jets, and these droplets then proceed downwards, accelerated by the gas jets to impact onto a substrate. The process is arranged such that the droplets strike the substrate whilst in the semi-solid condition, this provides sufficient liquid fraction to 'stick

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  • Sprühkompaktieren (de)
  • Spray forming (en)
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  • Sprühkompaktieren ist ein Fertigungsverfahren aus der Gruppe der Urformverfahren. Dabei wird zur Herstellung von endkonturnahen Bauteilen oder von Halbzeugen (Blöcke, Bolzen, Scheiben, Bleche, Rohre) eine Metallschmelze durch eine Düse versprüht. Der Sprühstrahl ist auf ein Substrat oder eine Auffangfläche gerichtet, wo die flüssigen oder in der Erstarrung befindlichen Schmelztröpfchen zu einem festen Körper „kompaktiert“ werden. Versetzt man die Auffangfläche in eine langsame Rotation und zieht sie sukzessive nach unten weg, dann „wächst“ im Gegenzug ein bolzenförmiger Körper herauf. (de)
  • Spray forming, also known as spray casting, spray deposition and in-situ compaction, is a method of casting near net shape metal components with homogeneous microstructures via the deposition of semi-solid sprayed droplets onto a shaped substrate. In spray forming an alloy is melted, normally in an induction furnace, then the molten metal is slowly poured through a conical tundish into a small-bore ceramic nozzle. The molten metal exits the furnace as a thin free-falling stream and is broken up into droplets by an annular array of gas jets, and these droplets then proceed downwards, accelerated by the gas jets to impact onto a substrate. The process is arranged such that the droplets strike the substrate whilst in the semi-solid condition, this provides sufficient liquid fraction to 'stick (en)
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  • Sprühkompaktieren ist ein Fertigungsverfahren aus der Gruppe der Urformverfahren. Dabei wird zur Herstellung von endkonturnahen Bauteilen oder von Halbzeugen (Blöcke, Bolzen, Scheiben, Bleche, Rohre) eine Metallschmelze durch eine Düse versprüht. Der Sprühstrahl ist auf ein Substrat oder eine Auffangfläche gerichtet, wo die flüssigen oder in der Erstarrung befindlichen Schmelztröpfchen zu einem festen Körper „kompaktiert“ werden. Versetzt man die Auffangfläche in eine langsame Rotation und zieht sie sukzessive nach unten weg, dann „wächst“ im Gegenzug ein bolzenförmiger Körper herauf. (de)
  • Spray forming, also known as spray casting, spray deposition and in-situ compaction, is a method of casting near net shape metal components with homogeneous microstructures via the deposition of semi-solid sprayed droplets onto a shaped substrate. In spray forming an alloy is melted, normally in an induction furnace, then the molten metal is slowly poured through a conical tundish into a small-bore ceramic nozzle. The molten metal exits the furnace as a thin free-falling stream and is broken up into droplets by an annular array of gas jets, and these droplets then proceed downwards, accelerated by the gas jets to impact onto a substrate. The process is arranged such that the droplets strike the substrate whilst in the semi-solid condition, this provides sufficient liquid fraction to 'stick' the solid fraction together. Deposition continues, gradually building up a spray formed billet of metal on the substrate. The gas atomised spray forming (GASF) process typically has a molten alloy flow rate of 1–20 kg/min, although twin atomizer systems can achieve metal flow rates of up to 80 kg/min. Special steel billets of 1 tonne or more have been produced by spray forming on a commercial basis, together with Ni super-alloy ring blanks of up to 500 kg and Al alloy extrusion billets of up to 400 kg. (en)
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