An effective numerical model has been developed to simulate the thermal behaviour of extrusion preheating processes for metals. The model utilises a finite difference scheme to predict the temperature profile of the billet during and subsequent to heating. The model is versatile and has been applied to show that a three zone induction preheater, especially designed to provide taper heating for isothermal extrusion, can achieve the desired taper temperature profile for aluminium alloys. Applications of the present model to other types of preheater are also discussed.
MST/399
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