Tube bending is a forming process that produce a plastic deformation on a pipe or tube. Usually, round stock is what is used in tube bending. However, square, rectangular, solid or extruded tubes and pipes may also be bent to meet job specifications.
Like in press brake forming, tubes experience springback after bending, producing a bend that undergoes radial growth. Another one effect of bending the workpiec e is the wall thickness changes, the wall along the inner radius of the tube becomes thicker and the outer wall becomes thinner.
There are basically four ways of tube bending:
Ram-type bending: It is one of the oldest and simplest tube bending methods, it uses a hydraulically driven ram that forces a tube against rollers or pivot blocks.
Roll bending: generally entails three rolls positioned ina pyramid.The rolls move to produce specific, usually very large radiibend. This process is widely used to produce spirals.