Profiled bar, and vehicle spring produced therefrom

A method for producing a vehicle spring comprising the steps of providing a profiled bar having a longitudinal axis, a transverse axis (z) that runs crosswise to the longitudinal axis and that corresponds to the neutral fiber, and an axis (v) that runs at right angles to the transverse axis (z) from the bottom to the top of the profiled bar, the profiled bar also having a planar cross section perpendicular to the longitudinal axis thereof, the planar cross section defining a trapezoid over the entire length of the profiled bar, the trapezoid having a top side, a bottom side, a first narrow side and a second narrow side, each side defining a flat segment, each of the said first and second narrow sides extending between the top and bottom sides, a portion of one of the top side and the bottom side and the neutral fiber extending in parallel to one another, the first narrow side defining a first material recess and the second narrow side defining a second material recess, each material recess having a depth, the first material recess and the second material recess extending over the entire length of the profiled bar;

• heating the profiled bar to a temperature of approximately 800 to 1200° C.;
• rolling the profiled bar to change the depth and the width of the first material recess and the second material recess over the length of the profiled bar;
• modifying the first longitudinal end portion for direct or indirect attachment to a vehicle chassis;
• and
• modifying the second longitudinal end portion for direct or indirect attachment to a vehicle chassis.