Dies for shaping containers and methods for making same

Abstract

A method of manufacturing a die for shaping metal containers comprises providing an expansion die for manufacturing metal containers and peening at least a portion of the work surface of the expansion die. Another method of manufacturing a die for shaping metal containers comprises providing a die for narrowing a diameter of metal containers and peening at least a portion of the work surface of the die.

1 . An expansion die for manufacturing metal containers comprising:
 a work surface configured to expand a diameter of a metal container having a closed bottom, the work surface comprising:   a progressively expanding portion; and   a land;   wherein an outer diameter of the land is a maximum diameter of the die;   wherein at least a portion of the work surface has a maximum ratio of the closed void area in the range 1-30%.   
     
     
         2 . The expansion die of  claim 1  wherein at least a portion of the land has a surface finish having a maximum ratio of the closed void area in the range 1-30%. 
     
     
         3 . The expansion die of  claim 1  wherein at least a section of the progressively expanding portion has a surface finish having a maximum ratio of the closed void area in the range 1-30%. 
     
     
         4 . The expansion die of  claim 1  further comprising an undercut portion, wherein the land is between the progressively expanding portion and the undercut portion. 
     
     
         5 . A die for manufacturing metal containers comprising:
 a work surface configured to narrow a diameter of a metal container having a closed bottom, the work surface comprising:   (i) a neck radius portion   (ii) a shoulder radius portion; and   (iii) a land;   wherein inner diameter of the land is a minimum diameter of the die;   wherein at least a portion of the work surface has a surface finish having a maximum ratio of the closed void area in the range 1-30%.   
     
     
         6 . The die of  claim 5  wherein at least a portion of the land has a surface finish having a maximum ratio of the closed void area in the range 1-30%. 
     
     
         7 . The die of  claim 5  wherein at least a section of the neck radius portion has a surface finish having a maximum ratio of the closed void area in the range 1-30%. 
     
     
         8 . The die of  claim 5  wherein at least a section of the shoulder radius portion has a surface finish having a maximum ratio of the closed void area in the range 1-30%. 
     
     
         9 . The die of  claim 5  further comprising a relief, wherein the land is between the neck radius portion and relief. 
     
     
         10 . A method of manufacturing a die for shaping metal containers comprising:
 providing an expansion die for manufacturing metal containers comprising:
 a work surface configured to expand a diameter of a metal container having a closed bottom, the work surface comprising: 
 (i) a progressively expanding portion; and 
 (ii) a land; 
 wherein an outer diameter of the land is a maximum diameter of the die; 
   peening at least a portion of the work surface.   
     
     
         11 . The method of  claim 10  wherein at least a portion of the land is peened. 
     
     
         12 . The method of  claim 10  wherein at least a portion of the progressively expanding portion is peened. 
     
     
         13 . The method of  claim 10  wherein the peened portion of the work surface has a surface finish having a maximum ratio of the closed void area in the range 1-30%. 
     
     
         14 . A method of manufacturing a die for shaping metal containers comprising:
 providing a die for manufacturing metal containers comprising:
 a work surface configured to narrow a diameter of a metal container having a closed bottom, the work surface comprising: 
 (i) a neck radius portion 
 (ii) a shoulder radius portion; and 
 (iii) a land; 
 wherein inner diameter of the land is a minimum diameter of the die; and 
   peening at least a portion of the work surface.   
     
     
         15 . The method of  claim 14  wherein at least a portion of the land is peened. 
     
     
         16 . The method of  claim 14  wherein at least a portion of the shoulder radius portion is peened. 
     
     
         17 . The method of  claim 14  wherein at least a portion of the neck radius portion is peened. 
     
     
         18 . The method of  claim 14  wherein the peened portion of the work surface has a surface finish having a maximum ratio of the closed void area in the range 1-30%.