Parting tool

A parting tool for continuous chipless separation of identical parts from a rotation-symmetrical workpiece, comprising:

• a pair of cutting rollers disposed above one another at formation of a gap for passage of a workpiece in a transport direction, each said cutting roller including a main body having axial ends defining an entry zone and an exit zone, respectively, said main body having a slip bevel at the entry zone and a cutting screw disposed in succession of the slip bevel and including a screw thread having coils which define a helix line and are configured with an increase in height, said screw thread including in series an entry portion, a substantially cylindrical primary portion in succession of the entry portion, and a separating portion disposed at the exit zone, said entry portion, primary portion and separating portion having different slope angle, with the slope angle determined by a combination of a thickness of the screw thread and a root width between two neighboring coils of the screw thread, wherein the increase in height of the coils correlates to the helix line;
• bearing means for supporting the axial ends of the main body;
• and
• at least two exchangeable calibrating rollers disposed in transport direction behind the bearing means at the exit zone of the cutting rollers.