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TECHNICAL PAPERS

Improving Formability in Sheet Metal Stamping With Active Drawbead Technology

[+] Author and Article Information
M. L. Bohn

Pactiv Corp., Canandaigua

S. G. Xu

Formability Analysis Dept., Metal Fabricating Division GM, Troy, MI

K. J. Weinmann, C. C. Chen

Department of Mechanical Engineering and Engineering Mechanics, Michigan Technological University, Houghton, MI 49931-1295

A. Chandra

Mechanical Engineering Department, Iowa State University, Ames, IA

J. Eng. Mater. Technol 123(4), 504-510 (Jul 24, 2000) (7 pages) doi:10.1115/1.1395577 History: Received July 24, 2000
Copyright © 2001 by ASME
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References

Figures

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6111-T4 aluminum test panel
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Schematic view of drawing tooling
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Drawbead trajectories for open-loop investigation
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Quarter panel showing grid circle locations for viscoplastic strain analysis
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Finite element model (quarter panel) for oval die
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Punch load curves for trajectories 1–4 compared to the baseline of 5 mm constant penetration
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Experimental (top) and predicted (bottom) strains in Zone A for variable drawbead penetration cases 1 through 4, and 5 mm constant penetration
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Experimental (top) and predicted (bottom) strains in Zone B for variable drawbead penetration cases 1 through 4, and 5 mm constant penetration
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Experimental (top) and predicted (bottom) strains in Zone C for variable drawbead penetration cases 1 through 4, and 5 mm constant penetration
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Experimental (top) and predicted (bottom) strains in Zone D for variable drawbead penetration cases 1 through 4, and 5 mm constant penetration
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Measured strain on deformed panel for drawbead Case T1, compared to experimental FLD for 6111-T4 aluminum
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Measured strain on deformed panel for drawbead Case T50, compared to experimental FLD for 6111-T4 aluminum.
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Deformed part showing regions of punch face covered by each strain circle
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Measured strains on left side (C1) of punch face in length (parallel to drawbeads) and width directions
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Measured strains on right side (C3) of punch face in length (parallel to drawbeads) and width directions
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Measured strains on center (C2) of punch face in length (parallel to drawbeads) and width directions

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