The invention relates to a punch (30) for a caulking and / or riveting device having a workpiece receiving opening (32) which is formed on a pressing surface (34) of the punch (30) such that a protruding on a contacting surface (26) At least partially by means of an approximation of the pressing surface (34) of the punch (30) to the contacting surface (26) in the workpiece receiving opening (32) can be introduced and corresponding to an inner contour of the workpiece receiving opening (32) is deformable, wherein at least a partial surface ( 36) of the inner contour is shaped spherical cap or ellipsoidkalottenförmig, and wherein the inner contour of the workpiece receiving opening (32) lying between an edge (38) of the inner contour of the pressure surface (34) and the spherical cap or ellipsoidkalottenförmigen part surface (36) Innenkonturzwischenfläche (40) , which is shaped cylinder-shaped or truncated cone shaped, has. The invention also relates to a caulking and / or Vernietvorrichtung, a joining partner for interacting with the stamp or with the caulking and / or Vernietvorrichtung, a device with at least one caulked or riveted workpiece and a method for caulking or riveting a workpiece.
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