Abstract
In extrusion, the knowledge of temperature distrbution is helpful in selecting process variables such as speed, initial temperatures and cooling conditions to optimize the process. This study describes a computer aided numerical technique for the calculation of temperature distribution in the billet, extruded product, and tools. The model is based upon Avitzur's spherical velocity field and extended to include transient heat conduction, heat generation and mass transport effects on the basis of local temperatures and strain-rates. The finite difference formulation of the problem considers the heat generation and conduction in each time step of the solution. A computer program is developed to solve the problem. Temperature distributions are calculated as a function of time. Predicted temperatures for various extrusion conditions are compared with experimental results and other data available in the literature. The results indicate that the method developed in this study can be successfully used in predicting temperatures in axisymmetric extrusion.
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