(1) At the transition zone, the strip deformation is a combination of strip deformation in the conventional roll
forming and flanging processes. Similar to the conventional roll forming process, the strip edge is stretched
before the forming stand. Then, by entering to forming stand, strip is deformed to stretching zone or
compression zone according to flange shape. Although the strip deformation is gradually in this step, it is
similar to the strip deformation in the flanging process.