Abstract
Abstract 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 = 10 0 to 20 0 ) 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. Key words : Lobatto Quardature Method, Extrusion Ratio, Strain Hardening Model, Material Parameter, Roelands’ Viscosity Model
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