Abstract: A process and apparatus for upsetting pipe ends, in particular drill rod pipe ends forming tool joints. The pipe end is held in a bottom die of a press and a shoulder mandrel is axially driven into the pipe end by a ram thereby simultaneously upsetting and filling the empty space between the die and the pipe end. The process includes at least two steps. In a first step the pipe end is upset on the outside into a cylindrical pipe section of larger diameter and a defined conical transition region while the internal diameter remains unchanged. In a second step the upset pipe section is swaged inwardly by means of a swaging tool mounted on the ram of the press.

Abstract: A roller including a hollow cylindrical pipe portion having an outer diameter corresponding to that of the roller and having axle stump portions which have axial cylindrical end portions. The axle stump portions being at least partially frusto-conically shaped and being connected to the pipe portion via S-shaped radially inwardly bent portions. The pipe portion and S-shaped portions being of unitary construction and the axle stump portions being welded to this unitary construction.A process for producing rollers and the like having axle stumps at both of their axial ends from hollow cylindrical pipe pieces. The process includes the steps of reducing and deforming both axial ends of the pipe piece to form frusto-conical end portions. The pipe piece has an outer diameter corresponding to that of the roller. The shaping and deformation is carried out by means of a pipe deforming machine.