Spherical dies are increasing in popularity in the cold-forming industry because of the ease in subsequent secondary operations. This paper presents criteria curves, calculated using the finite element method, to avoid central bursting or internal chevrons in forward extrusions through spherical dies. Critical values of mean stress at the centerline of the extrusion are used as failure criteria to distinguish between acceptable and unacceptable die designs. These failure criteria are conservative in that the critical step for central bursting is considered to be the formation of a microvoid during extrusion, rather than linking of the voids during continued deformation. The resulting process criteria curves are conservative estimates of internal chevron formation during extrusion through spherical dies.
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February 2002
Technical Papers
Criterion for Prevention of Central Bursting in Forward Extrusions Through Spherical Dies Using the Finite Element Method
S. Sriram,
S. Sriram
Research and Development, Ispat Inland Inc., 3001 E. Columbus Drive, E. Chicago, IN 46312
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C. J. Van Tyne
C. J. Van Tyne
Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, CO 80401
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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
Contributed by the Manufacturing Engineering Division for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received July 1999; revised Feb. 2001. Associate Editor: R. Smelser.
J. Manuf. Sci. Eng. Feb 2002, 124(1): 65-70 (6 pages)
Published Online: February 1, 2001
Article history
Received:
July 1, 1999
Revised:
February 1, 2001
Citation
Sriram, S., and Van Tyne, C. J. (February 1, 2001). "Criterion for Prevention of Central Bursting in Forward Extrusions Through Spherical Dies Using the Finite Element Method ." ASME. J. Manuf. Sci. Eng. February 2002; 124(1): 65–70. https://doi.org/10.1115/1.1413776
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