Local Friction Coefficients in Axisymmetric Extrusions of Aluminum

[+] Author and Article Information
Said Sohrabpour, Erich G. Thomsen

Mechanical Engineering Department, University of California, Berkeley, Calif.

Aly H. Shabaik

College of Engineering, University of California, Los Angeles, Calif.

J. Eng. Ind 92(2), 461-467 (May 01, 1970) (7 pages) doi:10.1115/1.3427782 History: Received July 01, 1969; Online July 15, 2010


The results from steady-state extrusion studies with commercially pure aluminum using the visioplasticity method for analysis showed that interfacial friction between billet and tool influences the velocity distribution in the entire plastic zone. It was found that for well-lubricated billets, the tool-billet interface tends toward a stream line. It was found further that a reversal in sign of the resolved shear stresses and the coefficients of friction occurs in the interfacial material in the conical section of the die. An explanation for this anomaly has not yet been found, but it is believed that this behavior is due to the mechanism of plastic flow within the billet.

Copyright © 1970 by ASME
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