Tool and process for forming destacking formations on metal blanks

An assembly for forming a plurality of stacked metal blanks having at least one edge comprising:

• a blanking die assembly including a stripper plate and an opposing surface disposed in adjacent and spaced relationship to said stripper plate for conveying a metal sheet therebetween;
• at least one dimpler unit secured to said stripper plate and including a ball bearing for forming at least one dimple into the at least one edge of the conveyed metal sheet;
• said opposing surface defining at least one cavity disposed adjacent to said ball bearing for accepting part of the at least one dimple formed by said ball bearing;
• said dimpler unit including a bearing unit defining a passage housing said ball bearing, said passage extendingly perpendicularly to said opposing surface and terminating at an open end disposed adjacent said opposing surface;
• and
• said bearing unit defining a channel extending perpendicularly to said passage and a dimpler slider slideably disposed in said channel and movable between a retracted position wherein said dimpler slider is retracted away from said ball bearing and a contact position wherein said dimpler slider is disposed in abutting relationship with said ball bearing for moving said ball bearing towards said open end of said passage and into contact with said metal sheet to form the at least one dimple.