Hydrodynamic Lubrication in Axisymmetric Stretch Forming—Part 2: Experimental Investigation

[+] Author and Article Information
L. G. Hector

Alcoa Technical Center, Alcoa Center, PA 15069

W. R. D. Wilson

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

J. Tribol 113(4), 667-674 (Oct 01, 1991) (8 pages) doi:10.1115/1.2920677 History: Received July 16, 1990; Revised November 15, 1990; Online June 05, 2008


In order to test the validity of the theoretical model discussed in Part 1, an experimental technique, employing optical interferometry, has been developed to measure lubricant film thickness during axisymmetric stretch forming. Specially fabricated, transparent punches are used for both double and multiple beam interference studies. The choice of workpiece material, lubricant, and forming speed ensures that the punch/sheet conjunction will be hydrodynamically lubricated during most of the process. Interference patterns, due to the variable film of lubricant separating the punch and sheet surfaces, are formed as the sheet wraps around the punch. These patterns provide a contour map of the lubricant film thickness along the punch/sheet conjunction. The measured film thickness, as taken from an interpretation of the patterns, is compared with the theoretical predictions of Part 1.

Copyright © 1991 by The American Society of Mechanical Engineers
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