Abstract
Pressure and frictional stress distributions on the contacting surface between a billet and a container have been investigated during the hot extrusion of aluminum alloy 6063 using sensors that have been developed by the authors. Frictional stress increases with the distance from the die and is markedly high in the front part of the dummy block. The distribution of friction is caused by the shearing deformation between the boundary material fixed on the container surface and the central part moving to the die exit. The relations with the internal deformation and stress state have been investigated by FEM analysis. Furthermore, the influences of several parameters in the extrusion on the pressure and frictional stress distributions have been observed. Knowledge of the friction between the billet and the container surface is useful for setting the proper extrusion conditions to achieve extruded material of constant quality.
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