Computerised model of temperature changes during metal extrusion

Abstract

Calculation of the temperature changes during both the upset stage and the formation of the steady state deformation zone has been shown to be essential in the prediction of deformation pressures and product microstructures during the extrusion of solid and powdered aluminium alloys. These changes have often been ignored and more analytical effort has been concentrated on the temperature changes that occur once steady state deformation has been established. However, because the billet temperature at the onset of steady state extrusion is difficult to monitor experimentally the development of predictive models for this stage of the extrusion process is considered an essential feature of full process control. Such estimates of temperature change have also been found to be essential in relating extruded microstructures to microstructures produced in metalworking tests, such as torsion and plane strain compression, and in the accurate prediction of hot shortness boundaries.

MST/1653