Abstract
The deep drawability of tailored blanks (TBs) composed of thick and thin sheets was investigated by performing square-cup drawing experiments. For a square TB, the weld bead line at the bottom of the cup moves toward the thick-sheet side during drawing, whereas the weld bead lines at the flange are fixed by a step placed on the blank holder. The drawability of TB is considerably lower than those of their component sheets, since the plane-strain stretching mode is more likely to occur in such TB under constraint. To improve the drawability, two different types of TB, namely, TB with corner cuts and nonsymmetric rectangular TB, were examined. It was found that the drawabilities in both cases were higher than that of the square TB. In particular, the increase in limiting cup height was remarkable in the latter case.
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