Patent ID: 9120137
Filing Date: 2015-09-01
Classification: B21D

Abstract:
1. A stamping apparatus for stamping a blank, comprising: a lower die defining a cavity, the lower die including a land portion surrounding the cavity; a movable upper die including a drawing punch that corresponds to the cavity; and a binder movable towards the land portion of the lower die for engaging an edge portion of the blank, wherein the land portion of the lower die and the movable binder each include a plurality of beads that crimp the edge portion of the blank when the movable binder engages the edge portion of the blank to form a crimped portion, the plurality of beads being oriented orthogonal to a terminal edge of the edge portion; the land portion of the lower die and the movable binder each include a projection formed directly opposite from each other, inboard from the plurality of beads, and directly adjacent to the cavity, the projections of the lower die and binder collectively defining a throat portion when the binder is engaged with the blank that, as the edge portion of the blank is drawn towards the cavity by the drawing punch, engages with and restrains movement of the crimped portion towards the cavity.