Frame for self-piercing rivet system

A frame for a self-piercing rivet system provided a punch unit on an upper portion thereof and an anvil unit on a lower portion thereof corresponding to the punch unit, the frame comprising:

• an outer frame portion including an inner semicircular body having a constant radius, an outer semicircular body having a larger radius than the inner semicircular body, disposed outside of the inner semicircular body by arranging a center thereof on a horizontal center line adjacent to a center of the inner semicircular body, and connecting an upper end and a lower end thereof with an upper end and a lower end of the inner semicircular body through each connecting end, and a plurality of ribs forming a plurality of closed spaces between the inner semicircular body and the outer semicircular body by connecting an external circumferential surface of the inner semicircular body and an interior circumferential surface of the outer semicircular body;
• an inner frame portion formed to be a bending body which includes a vertical portion formed in a vertical direction corresponding to an interior circumferential surface of the inner semicircular body and an upper curved end and a lower curved end connected to both ends of the inner semicircular body by being bent and extended upwards and downwards from the vertical portion along the interior circumferential surface of the inner semicircular body, and connected to the inner semicircular body through a barrier formed at the center in a thickness direction between the inner semicircular body and the bending body;
• an upper inner extender extended from the upper curved end;
• an upper outer extender extended from an upper end of the outer semicircular body;
• a lower inner extender extended from the lower curved end;
• a lower outer extender extended from a lower end of the outer semicircular body;
• a punch mounting end integrally formed at a front end of the upper inner extender and the upper outer extender;
• and
• an anvil mounting end integrally formed at a front end of the lower inner extender and the lower outer extender.