v-bend die

A die commonly used in press-brake forming, usually machined with a triangular cross-sectional opening to provide two edges as fulcrums for accomplishing three-point bending

velocity of final hem steel

Speed at which the final hem steel travel during final hem.

vent

A small hole in a punch or die for admitting air to avoid suction holding or to relieve pockets of trapped air which would prevent proper die closure or action, and also reduces press tonnage required.

vent mark

A small protrusion resulting from the entrance of metal into die vent holes.