Patent ID: 9149854
Filing Date: 2015-10-06
Classification: B21D

Abstract:
1. A stamping apparatus for stamping a blank, the apparatus comprising: a first die including a forming cavity and a plurality of depressions positioned outboard and along a periphery of said forming cavity in a non-overlapping manner, said depressions each defined by a first corner proximate said forming cavity and a second corner distal said forming cavity in the outboard direction from said first corner and said forming cavity; and a blank-holding ram including a plurality of beads each configured to engage an edge portion of said blank into said depressions when the blank is positioned between the first die and the blank-holding ram, said beads each including a third corner proximate said forming cavity and a fourth corner distal said forming cavity in the outboard direction from said third corner, wherein said first corner of said depression includes a radii of curvature greater than the radii of curvatures of said second corner of said depression, and the third and fourth corners of the bead, and the first corner is located distal from the edge portion of the blank.