Swaging dies

For use in a press for swaging a sleeve onto a bar a pair of coacting high strength metal compression dies, each of said dies comprising a recess extending parallel to the longitudinal axis of said bar [and having a ribbed medial portion including] , said recess including a medial portion of uniform size and shape extending along its entire length, the surface of the medial portion of the recess being in the form of a plurality of radially projecting ribs extending along said axis, said ribs projecting [upward] radially inward from said [recess], surface with the recess portions of said recess between immediately adjacent ribs being concavely relieved, the ribs being so located that when said dies are in contact with each other their [recesses] medial recess portions conjoin to form a polygonal opening of uniform profile along its length , with the concave relieved portions of the dies equidistantly spaced about the periphery of said polygonal opening , said dies being arranged to be brought together in a radial direction by said press, with said sleeve and said bar disposed therebetween to compress the sleeve onto the bar so that [upon swaging] the material of the sleeve adjacent each of said concave relieved portions conveniently flows into said relieved portions.