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RESEARCH PAPERS

Punching of Copper Under Pressure

[+] Author and Article Information
H. Kaneda, A. R. Bobrowsky

Materials Research Laboratory, The Pennsylvania State University, University Park, Pa.

J. Basic Eng 94(1), 61-64 (Mar 01, 1972) (4 pages) doi:10.1115/1.3425386 History: Received August 11, 1971; Online October 27, 2010

Abstract

Punching of copper sheet at atmospheric pressure and under environmental pressures up to about 160,000 psi showed the following: The fraction of slug thickness that is burnished is essentially independent of the thickness of the metal specimen; finite pressures can be used for complete burnished punching (about 70,000 to 110,000 psi for the soft copper and about 70,000 to 120,000 psi for the hard copper); hard copper requires higher pressure to achieve the same fraction of burnished zone as soft copper at the lower pressures, but requires the same pressure at higher pressures; and, the effect of clearance is complex inasmuch as small clearance yields larger burnished zones at atmospheric pressure, but the reverse is true at the highest pressures, with a crossover in between at about 70,000 psi.

Copyright © 1972 by ASME
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