An alternative to extruding the tube is to cast it. Centrifugal casting is one method that uses weight and centrifugal force. This method is particularly suitable when it comes to large tubes in smaller quantities. The maximum length is approx. 1200 mm. The most suitable alloy for centrifugal casting is AlMgSi5.
There are three different methods for centrifugal casting:
With true centrifugal casting the mould is allowed to spin around its own axis, which produces a casting, particularly suitable for hollow cast goods. It is possible to vary the angle of the rotation axis in order to achieve different effects.
With centrifugal pressure die casting the mould rotates on a vertical plane. The centrifugal force is then only used to remove waste, post-feed materials and for smaller improvements.
With Centrifugal die casting the mould is placed on a round plate. The mould and the plate then spins around so that the centrifugal force forces the molten metal out from the centre of the plate, into the moulds. This is an excellent method for thin materials, complex components and for certain alloys that have a high smelting temperature.
