2013 Volume 7 Issue 2 Pages 235-244
Accurate determination of friction at the die/billet interface in hydrostatic extrusion is a complex issue due to involvement of various operating parameters viz. billet velocity, die geometry, contact pressure, material parameter and the regime of lubrications prevailing at die/billet interface. Therefore, the objective of this paper is to investigate friction and friction stress at die/billet interface in hydrostatic extrusion process of aluminium based alloys. The friction stress at die/billet interface is numerically computed for three lubricants whose rheology is represented by Roelands' viscosity model. Investigations have been carried out for friction stress variations along the work zone for a wide range of extrusion ratios (A = 2 to 10), semi-die angles (θ = 100 to 200) and material parameters (G = 0.67 to 1.86). Moreover, the validation of the proposed model has been done with the published work available in the literature.
