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RESEARCH PAPERS

An Isoviscous Model for the Hydrodynamic Lubrication of Plane Strain Forging Processes With Flat Dies

[+] Author and Article Information
W. R. D. Wilson

Department of Mechanical and Aerospace Engineering, University of Massachusetts, Amherst, Mass.

J. of Lubrication Tech 96(4), 539-546 (Oct 01, 1974) (8 pages) doi:10.1115/1.3452478 History: Received June 07, 1973; Online October 18, 2010

Abstract

Transient isoviscous hydrodynamic theory is used to investigate the lubrication of plane strain forging processes with flat dies. It is shown that during yielding a film which decreases from a maximum thickness at the center of the contact to zero at the edges is formed. As the deformation continues, the film is transported outwards at half the surface speed of the workpiece. In the case where the dies extend beyond the workpiece, an unlubricated region is formed. The variation in width of this region with reduction predicted by the model is in good agreement with experimental measurements.

Copyright © 1974 by ASME
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