Isothermal extrusion of alminum alloys is a method of maintaining a constant temperature of an extruded section in the bearing zone of the die in order to obtain a high stable dimensions and mechanical properties. In this study, an equation for calculating the initial billet temperature to perform isothermal extrusion is proposed and confirmed. The concept of the equation for isothermal extrusion is to assign an adequate initial billet temperature, container temperature and ram speed to equalize the heat flow from the billet to the container and the heat generation by the shearing deformation of metal close to the container wall. Under the consideration of the parameters in the heat generation in the FEM analysis, adequate extrusion conditions are obtained. Using the results by the FEM analysis, isothermal extrusion has been realized in the extrusion of alminum alloy 6063.
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