Method for producing a torsional profile from a blank, and torsional profile

A method for producing a torsional profile from a blank, which torsional profile has torsionally rigid tubular end sections, a torsionally flexible U-shaped middle longitudinal section and, between the middle longitudinal section and the end sections, transition sections which change from the U-shaped cross section to the tubular cross section, comprising:

• a) forming a longitudinally oriented U-shaped depression into the blank at a distance from the face ends thereof, so as to form legs which extend away from the depression;
• b) bending the legs of the deformed blank adjacent to the depression such that said legs are arranged substantially parallel to one another and to the middle longitudinal plane of the depression;
• c) deforming the bent legs into a tubular shape in the regions adjacent to the face ends of the blank, and deforming the bent legs into a U-shape in the longitudinal section with the depression, in a manner adapted to the contour of the depression, longitudinal edges of the bent legs being arranged facing one another over their entire longitudinal extent;
• and
• d) introducing at least one spacer into the deformed blank such that the bent legs and delimiting walls, which extend in the direction of longitudinal edges of the middle longitudinal section, of the depression are held spaced apart in the middle longitudinal section, wherein the at least one spacer is arranged between the longitudinal edges of the bent legs.