Patent ID: 8646303

Claim:
Method for the manufacture of a profile with a cross-section of different thicknesses made from a flat metal strip by means of roll-profiling, comprising: producing, using a first roller pair having an upper roller and a lower roller, a first recess with a reduced material thickness on at least one side of the metal strip, the first recess being produced by a first protrusion arranged on the lower roller; and widening said first recess, using at least one following roller pair, each following roller pair having a following upper roller and a following lower roller, the following lower roller having a following protrusion with an increased protrusion width for increasing the first recess width to form a region with reduced material thickness, wherein a region of the flat metal strip arranged adjacent to the first recess is bent before and/or during an engagement of the first roller pair by obliquely running edge regions of the upper roller and the lower roller, the protrusion arranged on the lower roller serving as a counter part or bending edge, and wherein the bent region of the metal strip is incrementally bent more by each following roller pair until a maximum erection angle between a central part of the metal strip and the bent region is obtained.