An Elasto-Plasto-Hydrodynamic Lubrication Analysis of the Hydrostatic Extrusion Process

[+] Author and Article Information
R. W. Snidle

Department of Mechanical Engineering, University College, Cardiff, Wales

D. Dowson, B. Parsons

Department of Mechanical Engineering, The University of Leeds, Leeds, England

J. of Lubrication Tech 95(2), 113-122 (Apr 01, 1973) (10 pages) doi:10.1115/1.3451743 History: Received December 06, 1971; Online October 18, 2010


The authors describe a numerical procedure for the solution of the problem of hydro-dynamic lubrication in the hydrostatic extrusion process. The lubricant is assumed to be a Newtonian fluid and in this preliminary analysis it is assumed that the yield strength of the worked material remains constant. Elastic deformation of the billet as it enters and leaves the die is considered but this effect is found to have only a small influence upon the thickness of the lubricant film which is generated. Thermal effects arising from plastic deformation of the billet and viscous dissipation in the lubricant film are also considered. Theoretical results are presented showing the influence of die angle and reduction ratio upon values of film thickness and extrusion pressure for two materials.

Copyright © 1973 by ASME
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