B - Operations – Transporting – 22 – D
Patent
B - Operations, Transporting
22
D
B22D 17/00 (2006.01) B22D 17/18 (2006.01) B22D 17/20 (2006.01) C22C 1/00 (2006.01)
Patent
CA 2385469
A method and apparatus for converting liquid alloy into its thixotropic state and for fabricating high integrity components by injecting subsequently the thixotropic alloy into a die cavity (51). The apparatus includes a liquid metal feeder (20), a high shear twin-screw extruder (30), a shot assembly (40) and a central control system. The apparatus and method can offer net-shaped components characterised by close to zero porosity, fine and equiaxed particles with a uniform distribution in the eutectic matrix, and a large range of solid volume fractions.
L'invention concerne un procédé et un dispositif permettant de convertir un alliage liquide afin de le rendre thixotropique, et de fabriquer des composants à haute intégrité par injection de cet alliage thixotropique dans la cavité (51) d'un moule. Le dispositif comprend un distributeur (20) de métal liquide, une extrudeuse (30) à double vis à cisaillement élevé, un ensemble (40) d'injection et un système central de commande. Ce dispositif et ce procédé permettent de produire des composants réticulés caractérisés par une porosité proche de zéro, des particules fines et équiaxes uniformément distribuées dans la matrice eutectique, et un large éventail de fractions de volume solide.
Bevis Michael John
Fan Zhongyun
Ji Shouxun
Brunel University
Macrae & Co.
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