US 12,221,250 B2
Tapered metal cup and method of forming the same
Anthony J. Scott, Westminster, CO (US)
Assigned to BALL CORPORATION, Westminster, CO (US)
Filed by BALL CORPORATION, Westminster, CO (US)
Filed on Jun. 3, 2022, as Appl. No. 17/832,241.
Application 17/832,241 is a division of application No. 16/214,477, filed on Dec. 10, 2018, granted, now 11,370,579.
Application 16/214,477 is a continuation in part of application No. 15/811,032, filed on Nov. 13, 2017, granted, now 10,875,076, issued on Dec. 29, 2020.
Claims priority of provisional application 62/455,697, filed on Feb. 7, 2017.
Prior Publication US 2022/0289431 A1, Sep. 15, 2022
Int. Cl. B21D 51/26 (2006.01); B21D 22/28 (2006.01); B21D 22/30 (2006.01); B65D 1/16 (2006.01); B65D 1/26 (2006.01); B65D 21/02 (2006.01)
CPC B65D 21/0233 (2013.01) [B21D 22/28 (2013.01); B21D 51/26 (2013.01); B21D 51/2638 (2013.01); B65D 1/165 (2013.01); B65D 1/265 (2013.01); B21D 22/30 (2013.01); B21D 51/2615 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method of forming a stackable tapered metallic cup, the method comprising:
providing a stock material;
cutting a blank from the stock material;
forming at least one cup from the blank using a blank and draw operation;
performing a redrawing operation on the cup to provide the cup with a predetermined height and a wall thickness;
subsequent to the redrawing operation, trimming the cup to a second height;
subsequent to the trimming, curling a top edge of the cup to form a lip;
forming one or more straight wall sections in the cup;
expanding each of the one or more straight wall sections using one or more dies with a tapered profile;
forming a dome in a bottom of the cup; and
forming a stacking feature in the bottom of the cup by providing a reforming tool and applying an axial compression force with the reforming tool, the axial compression force comprising a force that is substantially parallel to a longitudinal centerline of the cup on a portion of the bottom of the cup that is adjacent and exterior to the dome and such that a lowermost sidewall section of the cup is expanded outwardly without contacting the lowermost sidewall section and thereafter comprises an inward taper or slope.