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RESEARCH PAPERS

An Approximate Model to Calculate Foldover and Strains During Cold Upsetting of Cylinders Part I: Formulation and Evaluation of the Foldover Model

[+] Author and Article Information
O. M. Ettouney

Miami University, Oxford, OH 45056

K. A. Stelson

University of Minnesota, Minneapolis, MN 55455

J. Eng. Ind 112(3), 260-266 (Aug 01, 1990) (7 pages) doi:10.1115/1.2899584 History: Received October 01, 1988; Online April 08, 2008

Abstract

In this paper, a new approximate model to calculate foldover of a cylinder undergoing nonuniform compression test (simple upsetting) is presented. The model is formulated using constant-volume equations and workpiece geometry. In addition to foldover, the model can be used to calculate equatorial-axial strains. This eliminates the need for inscribing grids (when determining forming-limit diagrams) on the cylinder’s free surface to find these strains. Combined with friction-calibration curves (prepared using finite-element analysis) that relate foldover to friction, the model enables one to estimate the friction coefficient. This eliminates the need for a separate test (e.g., the ring test) to determine friction or evaluate type of lubrication to be used. When compared to finite-element results and experiments, the new model showed excellent results in calculating foldover, strains, and friction coefficient.

Copyright © 1990 by The American Society of Mechanical Engineers
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