Criterion for Prevention of Central Bursting in Forward Extrusions Through Spherical Dies Using the Finite Element Method

[+] Author and Article Information
S. Sriram

Research and Development, Ispat Inland Inc., 3001 E. Columbus Drive, E. Chicago, IN 46312

C. J. Van Tyne

Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, CO 80401

J. Manuf. Sci. Eng 124(1), 65-70 (Feb 01, 2001) (6 pages) doi:10.1115/1.1413776 History: Received July 01, 1999; Revised February 01, 2001
Copyright © 2002 by ASME
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Schematic of a conical die showing the initial and final radii R0 and Rf, of the workpiece, the semicone die angle α, and the length of deformation zone contact with the die, L
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Δ-parameter curve for chevron-free extrusions through spherical dies. The labeled points (numbered 1 through 4) were process conditions used for FEM validation.
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Normalized critical mean stress as a function of reduction ratio (for two friction factors) calculated from the existing Chrysler processing standard for conical dies
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Chrysler processing standard for chevron-free extrusions through conical dies
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Comparison of the Chrysler processing standard for chevron-free extrusions with the upper bound criteria curves (dashed lines) developed by Avitzur 1. The Chrysler processing standard, which is independent of friction, is a simplified version of the Avitzur criteria.
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Chrysler processing standard for chevron-free extrusions through conical dies compared to the Δ-parameter criteria
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Schematic of a spherical die showing initial and final radii R0 and Rf, of the workpiece, and die radius rD
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Line-contour plot for process #3 (from Table 1) showing the distribution of the ratio of the mean stress to flow strength (σm0)
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Simulations for spherical die extrusion matching the maximum critical mean stress using two different criteria. The solid symbols indicate simulations where the process conditions produced mean stresses corresponding to one of the criterion.
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Process criteria curves for prevention of central bursts during extrusions with spherical dies using the two different failure criteria



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