Method for producing hollow profiles having a longitudinal flange

Method for producing hollow profile-members having a longitudinal flange, wherein a plate which is arranged between a stamp and a first die is preshaped by introducing the stamp into the first die to form an U-shaped profile-member having a first member and a second member, wherein the U-shaped profile-member is shaped with a second die to form an O-shaped profile-member having a longitudinal flange, and wherein the plate is preshaped to form the U-shaped profile-member such that a longitudinal flange member portion is shaped in at least the first member and the longitudinal flange member portion is constructed during the shaping of the U-shaped profile-member to form an O-shaped profile-member substantially in a shape-retaining manner to form a portion of the longitudinal flange, the method comprising the steps of:

• shaping the longitudinal flange member portion at the beginning of the preshaping operation by means of a displaceable part-stamp of the stamp that is positioned so as to protrude in an introduction direction, and by means of a displaceable side wall of the first die that is positioned so as to protrude counter to the introduction direction;
• moving the part-stamp and the side wall by the stamp being further introduced into the first die from the protruding position into an aligned position;
• and
• preshaping the plate to form the U-shaped profile-member.