Abstract: A finite difference model of heat balance in axisymmetric extrusion process is constructed. In this model, a kinematically admissible velocity field is adapted and a rise in temperature is calculated by considering the heat generation due to deformation and friction, heat transfer and material flow, etc. Using this model, not only the rise in temperature during constant speed -extrusion process is calculated, but also the profile of ram speed temperature for simulant constant exit temperature extrusion and constant temperature extrusion under a specified exit temperature is calculated. The results are well in agreement with those of the experiments. The model can be used to optimize process parameters of hot extrusion.

Key words: extrusion, velocity, temperature, finite difference method