Seamless can body and method of manufacturing seamless can body

Abstract

Provided are a seamless can body having excellent pressure resistance and a method for producing the seamless can body. The seamless can body according to the present invention includes a tubular body section (10), a peripheral ground section (20b) continuing from a lower end of the tubular body section, and a raised bottom section (30) continuing from the peripheral ground section toward a center-axis side. When an outer surface area of the raised bottom section is denoted by AD and an area of a virtual plane an outline of which is formed by the peripheral ground section is denoted by AB, a relation of 1.55 ≥ (AD/AB) ≥ 1.40 is satisfied.

1 . A seamless can comprising:
 a tubular body section;   a peripheral ground section continuing from a lower end of the tubular body section; and   a raised bottom section continuing from the peripheral ground section toward a center-axis side,   wherein, when an outer surface area of the raised bottom section is denoted by A D  and an area of a virtual plane an outline of which is formed by the peripheral ground section is denoted by A B , a relation of           1   .55       ≥                 A   D       /       A   B                 ≥       1   .40            is satisfied.   
     
     
         2 . The seamless can according to  claim 1 , wherein, when a volume of a space surrounded by the virtual plane and the raised bottom section is denoted by V D  and a volume of a metallic member forming the raised bottom section is denoted by V M , a relation of 
       
         
           
             
               26 
               .0 
                 
               ≥ 
                 
               
                 
                   
                     
                       
                         V 
                         D 
                       
                     
                     / 
                     
                       
                         V 
                         M 
                       
                     
                   
                 
               
               ≥ 
               22 
               .0 
             
           
         
       
        is satisfied. 
     
     
         3 . A method for producing a seamless can body, the method comprising:
 a first forming step of forming a metallic blank material into a cup body having a tubular body section, a peripheral bottom section continuing from a lower end of the tubular body section, and a bulging section bulging from the peripheral bottom section toward an opening section by a first height; and   a second forming step of pressing down the bulging section in such a manner that the bulging section has a second height smaller than the first height, to thereby form a peripheral ground section continuing from the lower end of the tubular body section and a raised bottom section continuing from the peripheral ground section toward a center-axis side,   wherein, when an outer surface area of the raised bottom section is denoted by A D  and an area of a virtual plane an outline of which is formed by the peripheral ground section is denoted by A B , a relation of           1   .55   ≥             A   D       /       A   B             ≥   1   .40            is satisfied.