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TECHNICAL PAPERS

In Process Control of Strain in a Stretch Forming Process

[+] Author and Article Information
D. E. Hardt, W. A. Norfleet, V. M. Valentin, A. Parris

Lab for Manufacturing and Productivity, Massachusetts Institute of Technology, Cambridge, MA 02139

J. Eng. Mater. Technol 123(4), 496-503 (Aug 10, 2000) (8 pages) doi:10.1115/1.1397780 History: Received August 10, 2000
Copyright © 2001 by ASME
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References

Figures

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Steps of drape forming operation
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Schematic and key variables for a stretch forming process
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Strain distribution for constant die radius in drape forming
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Isotropic work hardening model
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Stress distribution for a forming sequence with some compressive plastic deformation and subsequent work hardening
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Force-strain sensitivity to yield stress changes
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Springback ratio sensitivity to material thickness
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Springback sensitivity to yield stress
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Springback sensitivity to strain hardening coefficient
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Springback sensitivity to material thickness
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Springback sensitivity to yield stress
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Springback sensitivity to strain hardening coefficient
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Placement of the strain gage to measure average strain. The gage is located at the midpoint of the free section between last die contact with the stretch jaws.
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Springback ratios for variations of yield strength (test set 1)
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Springback ratios for variations in thickness (test set 2)
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Leading edge part on die
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Separation of part from die
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Run chart for lot “A”
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Run chart for lot “B”
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Locations of strain measurements
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Run chart for strain-controlled lot “C”
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Reduction of contour variation for all 3 modes of optimized settings

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