Flat Bar Flange Forming Machine Multiple driving rollers clamp flat bar and feed material by rotary extrusion. By adjusting roller gaps, straight flat bar is gradually cold-bent into standard circular flange, then cut to fixed length. The finished flange features good roundness with less secondary finishing required for subsequent butt welding. Features Adjustable inner diameter for various flat bar sizes; Cold roll forming, less deformation and scratch-free surface; Variable