I’m developing a project of a Roll Forming Mill, and this is what I have designed so far. You can see on the Flower Diagram the different steps/passes needed to obtain the final bend shape (teardrop hem). The sheet is 1.2mm thick.

I have designed the first two passes, and there is still a LOT to do, and a lot of details to review. I will upload further developments of the design periodically. Any feedback or advice on how to improve the model will be most welcome. The design is based on the Roll Forming Handbook by Taylor & Francis.