Roll forming, is a constant bending operation in which a long strip of sheet metal (usually coiled steel) is passed throughout sets of rolls mounted on successive stands, every set performing only an incremental division of the bend, until the preferred cross-section profile is attained. Roll forming is perfect for producing regular profile parts in large quantities and with long lengths.
A range of cross-section profiles could be produced; however each profile needs a carefully crafted set of roll equipment. The rolls design starts with a flower prototype that is the series of profile cross-sections, one outline for every stand of rolls. Roll contours are then consequential from the flower pattern profiles. Since the high cost of the roll sets, computer imitation is generally used for developing or validating the roll designs and optimizing the forming procedure for minimizing the material stresses and number of stands in the final produce.
Roll formed sections might have benefits over extrusions of alike shapes. Roll formed parts might be much lighter, with thinner walls probable than in the extrusion method, plus stronger, having been work tough in a cold form. Parts could be made having finished or already painted. Moreover, the roll forming process is more rapid and takes less energy than extrusion.