Abstract
The deformation behaviour in shearing of ultra-high strength steel sheets under insufficient blankholding was examined. The blankholding force tends to be insufficient in shearing of hard sheets, and the quality of sheared edges is influenced. When the blank is sheared under insufficient blankholding with lifting of one edge of the blank lift, tilting of the blank occurs. As a result, burr height of sheared edge which was sheared in the condition that the sheet was inclined and blankholding force was insufficient increased. The shear angle of punch was introduced, then tilting of the blank was suppressed as shearing load decreased, and burr height was reduced. It was found that the shear angle for the reduction in the shear force is effective for decreasing the burr height in shearing of the ultra-high strength steel sheets under insufficient blankholding.
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