Abstract
The effects of specimen width and blankholder (clamp) force on LDH were investigated in tests with bare DDQ SK steel strip. Specimen width ranged from 109 to 143 mm (4.29 to 5.63 in.). The die set comprised a ball-bearing ball punch of 101.6 mm (4 in.) diameter and blankholders with a triangular clamping bead. Clamp forces ranged from 100 to 500 kN (11.25 to 56 tons). Draw-in, critical blank width, and LDH diminished with increasing clamp force, and draw-in and LDH reached their minimum at forces of 250 kN (28 tons) and above. The results showed that if an insufficient clamp force or a blank of excessive width is used, the LDH value will be above its true (minimum) value.
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