Hydrodynamic Lubrication in Hemispherical Punch Stretch Forming

[+] Author and Article Information
Kuo-Kuang Chen

Mathematics Department, General Motors Research Laboratories, Warren, Mich. 48090

D. C. Sun

Fluid Mechanics Department, General Motors Research Laboratories, Warren, Mich. 48090

J. Appl. Mech 53(2), 440-449 (Jun 01, 1986) (10 pages) doi:10.1115/1.3171778 History: Received February 12, 1985; Revised August 09, 1985; Online July 21, 2009


The existence and consequence of hydrodynamic lubrication in sheet metal forming is demonstrated using a model problem of hemispherical punch stretch forming. The problem is solved by incorporating a lubrication analysis into an incremental plasticity analysis. The sheet material is assumed to be elastic plastic with strain hardening, and the lubricant is assumed isoviscous. The study identifies two dimensionless parameters controlling the condition of lubrication. The resulting variable friction at the punch-sheet interface is found to affect significantly the distribution of strains in the sheet metal and its formability.

Copyright © 1986 by ASME
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