A method for producing a tubular hollow body from a tubular hollow body blank, the hollow body blank having a plastically deformable blank wall and, on the blank wall, being provided with an internal profile, the method comprising:
- arranging a profile-generating forming mandrel in an interior of the hollow body blank, the profile-generating forming mandrel having a forming external profile,
- arranging, on an outer side of the hollow body blank, a profile-generating forming die that has a die opening designed to receive the blank wall and having a calibration section, a cross section of which is smaller than a cross section of the hollow body blank in an initial state, and
- performing a profile-generating forming movement in which the profile-generating forming die arranged on the outer side of the hollow body blank, in a die feed direction, performs a die movement in which the profile-generating forming die is moved with the calibration section relative to the forming external profile of the profile-generating forming mandrel arranged in the interior of the hollow body blank, along the blank wall, which is at least inhibited from movement in the die feed direction,
- wherein, during the profile-generating forming movement, the die movement and an oppositely directed mandrel movement, which the profile-generating forming mandrel arranged in the interior of the hollow body blank performs in a mandrel feed direction opposite to the die feed direction, are superimposed on one another, the profile-generating forming mandrel, during the mandrel movement in the mandrel feed direction, exerting tensile stress on the blank wall,
- wherein, due to the profile-generating forming movement, material of the blank wall is plastified and the forming external profile of the profile-generating forming mandrel is reproduced on the inner side of the blank wall, thereby forming the internal profile at the blank wall of the hollow body blank,
- wherein before starting the profile-generating forming movement, the blank wall is provided with a wall projection that points, in a direction transverse to the blank wall, into the interior of the hollow body blank, which wall projection, during the profile-generating forming movement, is arranged on a side, located in the mandrel feed direction, of the profile-generating forming mandrel arranged in the interior of the hollow body blank and, in a direction transverse to the blank wall, engages over the profile-generating forming mandrel arranged in the interior of the hollow body blank,
- wherein the blank wall, during the profile-generating forming movement, is subjected to tensile stress by the profile-generating forming mandrel in the mandrel feed direction by the profile-generating forming mandrel acting in a positive manner on the wall projection of the blank wall in the mandrel feed direction, and
- wherein, following the profile-generating forming movement, a longitudinal portion of the blank wall provided with the wall projection is cut off at the hollow body blank provided with the internal profile.