Rivet sleeve, rivets and blind rivet setting process

Rivet sleeve (22) for a blind rivet (20), having a sleeve head (26) and a sleeve shaft (28) in a longitudinal axis (30) of the sleeve head (26) extends, wherein a longitudinal bore (32) for receiving a rivet pin (24) extending through the rivet sleeve (22) extends, said collar shank (26) having an axial mold portion (46) which is adapted to be deformed in a setting operation to a blind head (78), said mold section (46 ) comprises at least in sections, an embossment (58, 60) on the outer periphery of the sleeve shaft (28), wherein the mold portion (46) having a first axial portion (50) which faces away (the shell head 26), a second axial region (52) which faces the sleeve head (26), and a third axial region (54) between the first and second axial region (50, 52). In this case, at least the first axial portion (50) of the shaped portion (46) includes a stamping (58) which has in relation to the longitudinal axis (30) at least in sections a curved course (74) or a trigonometric function following the course (74).