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Formability in Deep Drawing Steel

Formability in Deep Drawing Steel. Christopher Melvin Washington State University 2008. Steel Coil. Some Applications Include. Automotive Motor casings Building supplies Household items. Deep Drawing. Drawability- high degree of plastic flow in plane, resistance to flow in thickness

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Formability in Deep Drawing Steel

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  1. Formability in Deep Drawing Steel Christopher Melvin Washington State University 2008

  2. Steel Coil

  3. Some Applications Include Automotive Motor casings Building supplies Household items

  4. Deep Drawing • Drawability- high degree of plastic flow in plane, resistance to flow in thickness • r-value = εw/ εt (ε-true strains) • r = ε22/ ε33 • q = -ε22/ε11 = εw/εl • Where ε11 ε22 ε33 are the normal strains in the x, y, and z directions respectively

  5. Cup Drawing Die

  6. Cup Drawing Sequence

  7. Variations of R-Value • rave–Formability parameter (normal anisotropy) rave = rm = (r0+2r45+r90)/4 • Δr–Earing parameter (planar anisotropy) Δr = (r0+r90-2r45)/2

  8. Methods to Determine R-Value Tensile Test rm 1.656 (cntr) Δr 0.9188 VHM Method rm 1.690 (cntr) Δr 0.92365 Company Methods (Module-R) rm 1.662 (ave) Δr 0.703

  9. Textures • Most important cause of anisotropic plastic properties • Rolling steel creates a preferred orientation (Texture) • R-value changes with different textures

  10. Euler Space-ODF Gamma Goss Phi = 45º

  11. ODF-Texture Plot

  12. Coil Edge (across width)

  13. Coil Center (across width)

  14. Edge vs. Center Edge Center

  15. Head vs. Tail (Phi = 45°) Head (center) Tail (center)

  16. Experimental Cup Profile

  17. VanHoutte Model

  18. Cup vs. R-Value Profiles

  19. Methods to Determine R-Value Tensile Test rm 1.656 (cntr) Δr 0.9188 VHM Method rm 1.690 (cntr) Δr 0.92365 Company Methods (Module-R) rm 1.662 (ave) Δr 0.703

  20. Hot Band Microstructure Gradient

  21. Center vs. Edge Microstructures Center Edge

  22. Conclusion • Designed cup die to measure earing • Compared direct measurements to model • Edge properties differ from center • Gradient in hot band carries over to cold rolled • Indications of Goss

  23. Thanks • Dr. David Field • Alankar Alankar • Dr. Leo Kestens • Dr. Paul VanHoutte

  24. Future research • Obtain model to calculate r-value • Increase accuracy of where the coupons were obtained • Obtain new samples to test after proposed process changes are made

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