Process for installing fatigue-rated rivets

A method of forming an interference fit between a rivet shank and the perimeter of apertures arranged in components to be assembled together comprising:

• inserting the rivet shank through the apertures until a first end of the rivet shank contacts a bucking bar thereby preventing the rivet shank from further movement thereagainst;
• arranging a forming die over the opposite end of the rivet shank;
• impacting the forming die in a single stroke by means of an impacting tool to thereby upset the opposite end of the rivet shank and radially expand same against the perimeter of the apertures to provide compression stressing;
• arranging a second bucking bar over the forming die and removing the first mentioned bucking bar;
• arranging a second forming die over the first end of the rivet shank;
• and
• impacting the second forming die in a single stroke by means of an impacting tool to thereby upset the first end of the rivet shank and radially expand same against the perimeter of the apertures to provide compression stressing, each of said impacting steps forming a button on the respective ends of the rivet shank, each of said buttons fitting tightly against respective outer surfaces of the assembled components.