… by bending, folding, straightening, flattening, shearing, punching, notching or nibbling (excluding draw-benches); …
Explanatory notes
… a single metal die operating on only one part of the unworked piece is used. This is called open-die forging. … and a single open die in a multiple step forming procedure until the final shape is achieved. (c) Hammers, drop … axis of the metal sheet, while the cross section is left unchanged. Roll forming machines, passing products through …