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RESEARCH PAPERS

Hydrodynamic Lubrication in Axisymmetric Stretch Forming—Part 1: Theoretical Analysis

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

Department of Mechanical Engineering, Northwestern University, Evanston, IL 60208

L. G. Hector

Alcoa Technical Center, Alcoa Center, PA 15069

J. Tribol 113(4), 659-666 (Oct 01, 1991) (8 pages) doi:10.1115/1.2920676 History: Received July 16, 1990; Revised November 15, 1990; Online June 05, 2008

Abstract

An improved theoretical model for the hydrodynamic lubrication of axisymmetric, sheet metal stretch forming is presented. The infinite initial film thickness problem, encountered in a previous model, is removed by accounting for the squeeze action occurring during the initial stages of the process. Both isoviscous and thermoviscous theories are developed assuming that the lubricant is a Newtonian fluid. In the thermoviscous model, the lubricant viscosity is assumed to vary exponentially with temperature. The influence of plastic heating of the sheet on the entrainment and transport of the lubricant film is examined. The effects of variable punch speed are also investigated.

Copyright © 1991 by The American Society of Mechanical Engineers
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