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TECHNICAL PAPERS

A Study on Fundamental Mechanisms of Warp and Recoil in Hemming

[+] Author and Article Information
Guohua Zhang, Xin Wu, S. Jack Hu

Mechanical Engineering and applied Mechanics, The University of Michigan, Ann Arbor, MI 48109

J. Eng. Mater. Technol 123(4), 436-441 (Jul 24, 2000) (6 pages) doi:10.1115/1.1396348 History: Received July 24, 2000
Copyright © 2001 by ASME
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References

Zhang,  G., Hao,  H., Wu,  X., Hu,  S. J., Harper,  K., and Faitel,  W., 2000, “An experimental investigation of curved surface-straight edge hemming,” Transactions of NAMARC/SME, pp. 311–316.
Hishida, Y., and Sato, Y., 1986, “Analysis of hemming processes by the FEM for improving hemming quality,” 14th IDDRG congress, pp. 21–23.
Niimi, Y., and Hattori, M., 1986, “Development of processing technique for improving hemming quality,” 14th IDDRG congress, pp. 432–433.
Sunaga,  H., and Makinouchi,  A., 1990, “Elastic-plastic FE simulation of sheet metal bending process for auto body panels,” Technology of Plasticity, 3, pp. 1525–1530.
Umehara,  Y., 1990, “Technologies for the more precise press-forming of automobile parts,” J. Mater. Process. Technol., 22, No. 3, pp. 239–256.
ABAQUS/Standard, User’s manual, Vol. 5.6, HKS Inc.

Figures

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An illustration of recoil and surface warp 1
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Three hemming stages, related terminology and a common coordinate system
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Surface warp evolution during pre-hemming
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Surface warp development during the final hemming stage
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Comparison of recoil and warp in FEA and experiment
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Final equivalent warp vs. pre-hemmer ending positions
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Occurrence of surface warp due to reverse bending moment
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Mechanism of warp development during pre-hemming and final hemming
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Surface warp development versus pre-hemmer positions under different parameter conditions
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Final equivalent residual warp under different parameter conditions
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Warp during pre-hemming and final hemming stages under different friction conditions
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Final equivalent residual warp under different friction conditions

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