ANALYSIS OF GROWING AND DISAPPEARING BEHAVIOR OF SURFACE DEFLECTION IN PRESS FORMING OF LARGE-SIZED AUTOBODY PANELS

The forming severity of large-sized autobody panels is assessed not only on the basis of the fracture, but also by the surface deflection which is a surface defect concave or convex to expected normal shape. For avoiding the surface deflection, the fitting behavior of the die to the panel, and fittability of material are investigated. The material properties constituting the fittability are mainly the yield point, the strain-hardening coefficient in the range of small strain and sometimes the n-value, the normal plastic anisotropy (r-value) corresponding to the deformation state. The shape of the blankholder surface strongly affects the growing behavior of the surface deflection, and the step draw greatly affects the decreasing behavior of the surface deflection.

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  • Corporate Authors:

    Society of Automotive Engineers of Japan

    10-2 Goban-cho, Chiyoda-ku
    Tokyo,   Japan 
  • Authors:
    • Ishigaki, H
    • Okamoto, I
    • Nakagawa, N
    • Arima, K
  • Publication Date: 1984-7

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Filing Info

  • Accession Number: 00395362
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: HS-037 960
  • Files: HSL, USDOT
  • Created Date: Jun 30 1985 12:00AM