Apparatus and method for forming a cup with a reformed bottom
View Patent ↗An apparatus and method of forming a metallic cup that is subsequently reformed into a container body. More specifically, an apparatus and methods used to form a metallic cup with a reformed bottom having an inwardly oriented projection are disclosed. The inwardly oriented projection reduces a height of the metallic cup but utilizes the same amount of metallic stock material as a taller cup with substantially the same diameter that does not have an inward projection. The inwardly oriented projection thus allows the use of a conventional bodymaker and other can manufacturing tools to convert the cup into a container body of a preferred size and shape.
1. An apparatus for forming a reformed metallic cup having a bottom portion with an inwardly oriented projection from a metallic cup with a substantially flat bottom portion, the improvement comprising:
providing the metallic cup with the substantially flat bottom portion and a sidewall;
a die center punch to support an interior surface of the substantially flat bottom portion of the metallic cup proximate to at least the sidewall, the die center punch having a cavity with a depth at least equal to a height of the inwardly oriented projection;
a reform draw pad with a substantially centered cavity; and
a reform punch opposing the die center punch to apply a force to an exterior surface of the substantially flat bottom portion of the metallic cup opposite of the die center punch, said reform punch comprising an extension which travels through the substantially centered cavity of the reform draw pad and into the cavity of said die center punch to form the inwardly oriented projection, wherein a height of the inwardly oriented projection is at least about 5 percent of a height of a sidewall of the reformed metallic cup, and wherein the reform draw pad is configured to move from a first position in which the extension of said reform punch does not extend into the substantially centered cavity of the reform draw pad to a second position in which the reform punch extension extends through the substantially centered cavity of the reform draw pad,
wherein the sidewall of the metallic cup with the substantially flat bottom portion is supported by an interior surface of a redraw die as the inwardly oriented projection is formed, and wherein the height of the sidewall of the reformed metallic cup with the inwardly oriented projection is between about 60 percent and about 97 percent of a height of the sidewall of the metallic cup with the substantially flat bottom portion.
2. The apparatus of claim 1 , wherein the cavity of the die center punch has a diameter of between about 1.5 inches and about 3.0 inches.
3. The apparatus of claim 1 , wherein the extension of the reform punch has a generally cylindrical shape with a rounded upper edge portion and an endwall that is generally planar.
4. The apparatus of claim 1 , wherein an interior diameter of the cavity of the die center punch is at least equal to an interior diameter of the substantially centered cavity of the reform draw pad.
5. The apparatus of claim 1 , wherein the reformed metallic cup is subsequently formed into a container body by a container bodymaker.