Disk and Strip Forging with Side Surface Foldover—Part 2: Evaluation of the Upper-Bound Solutions

[+] Author and Article Information
R. A. Kohser

University of Missouri-Rolla, Rolla, Mo.

B. Avitzur

Dept. of Metallurgy and Materials Science; Institute for Metal Forming, Lehigh University, Bethlehem, Pa.

J. Eng. Ind 100(4), 428-433 (Nov 01, 1978) (6 pages) doi:10.1115/1.3439457 History: Received July 31, 1977; Online July 15, 2010


The upper-bound solutions developed in Part 1 are evaluated with regard to their ability to produce a lower value for required power (load, pressure, or work). Comparisons made with existing solutions such as the triangular field solution and one-zone bulge solution show that for strip, each solution has a domain of geometry and friction in which it is superior. The new solution produces a lower upper-bound for conditions of high interface friction and relatively thin specimen, the area where foldover is the observed mode of flow. For solid cylindrical disks, the solution fails to improve upon existing analyses, but comes sufficiently close to warrant additional study. After evaluation, these solutions were then used in an incremental technique to model the geometry and flow as a function of reduction in height. Results appear most encouraging, and the relative simplicity of the technique when compared with present alternatives is quite attractive.

Copyright © 1978 by ASME
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