Device and method for the widening and forming of a can body

Abstract

The invention relates to an apparatus for spreading and shaping can bodies, having a pin-like shaping tool that is forced from one end into the can body to be widened and a counter tool. According to the invention the counter tool is also a pin-like shaping tool insertable from an opposite end into the can body, the shapes of the ends of the two pin-like shaping tools being the same or complementary according to the desired shape.

1 . An apparatus for spreading and shaping can bodies ( 5 ), having a pin-like shaping tool ( 1 ) that is forced from one end into the can body ( 5 ) to be widened and a counter tool ( 2 ), characterized in that 
 the counter tool ( 2 ) is also a pin-like shaping tool insertable from an opposite end into the can body ( 5 ), the shapes of the ends of the two pin-like shaping tools ( 1  and  2 ) being the same or complementary according to the desired shape.    
     
     
         2 . The apparatus according to  claim 1 , characterized in that the shape of the two pin-like shaping tools ( 1  and  2 ) at their ends has in regions inset toward the longitudinal pin axis ( 6 ) from other regions.  
     
     
         3 . The apparatus according to  claim 1  or  2 , characterized in that the pin ends have a maximum diameter that is less than, equal to, or slightly greater than the diameter of the unspread can blank ( 5 ).  
     
     
         4 . The apparatus according to one of  claims 1  to  3 , characterized in that the pin ends taper outward axially at their outer ends.  
     
     
         5 . The apparatus according to one of  claims 1  to  4 , characterized in that the pin end faces meet at least partially in regions not orthogonal to the pin longitudinal axis ( 6 ).  
     
     
         6 . The apparatus according to one of  claims 1  to  5 , characterized in that the pin outer surfaces deviate at least locally from a cylindrical shape.  
     
     
         7 . An apparatus for spreading and shaping can bodies ( 5 ), having a pin-like shaping tool ( 1 ) that is forced from one end into the can body ( 5 ) to be widened and a counter tool ( 2 ), characterized in that the pin outer surfaces deviate at least locally from a cylindrical shape.  
     
     
         8 . The apparatus according to one of  claims 1  to  7 , characterized in that the pin-like shaping tools are movable relative to strippers ( 3  and  5 ).  
     
     
         9 . A method of spreading and shaping can bodies ( 5 ,  10 ,  12 ,  14 ,  18 , and  24 ), wherein a pin-like shaping tool ( 1 ) is forced from one end into the can body ( 5 ) against a counter tool ( 2 ), characterized by use of an apparatus according to one of  claims 1  to  8 .