Forming
Processes
From Flat Material to Finished Curve
The SweBend knowledge center
What metal forming is
Metal forming shapes metal by force rather than by cutting: controlled plastic deformation pushes the material past its yield point into a new shape, with almost no waste. The family spans forging, extrusion, drawing, stamping and rolling. SweBend’s field is cold roll-forming – curving plate and structural sections between powered rolls – and this page explains how that works and which method fits which job. It is the process-and-materials companion to the wider SweBend forming hub.
The metal forming processes, and where roll-forming fits
Most metal forming processes fall into a few families: forging and stamping press the material against a die, extrusion and drawing force it through one, and rolling passes it between powered rolls. Roll-forming – the group SweBend builds machines for – curves plate and profiles progressively between rolls, producing smooth, continuous radii instead of the single creases a press brake leaves. For the deeper principles of forming and how it differs from forging, read our guide to the core principles of metal forming.
How roll-forming works in practice
Every SweBend method works the same way. The material is fed between powered rolls; moving one roll, or a pinch pair, presses it into a curve while the drive rolls feed it forward. The radius is approached over several passes rather than in a single hit, and pre-bending the leading and trailing ends minimises the flat ends that would otherwise be cut off as scrap. Because steel springs back slightly when the load is released, the operator over-bends by a measured amount to compensate. Roll power, drive torque and guide-roll support decide how heavy a section can be curved and how precisely it holds the radius – which is why these are the numbers that separate a clean part from an expensive scrap piece.
Cold roll-forming in action – a structural section curved on a SweBend angle roll
The three roll-forming methods
SweBend builds a dedicated machine line for each roll-forming discipline. Start with the method that matches your stock, then follow the link for the full breakdown.
- Plate rolling curves flat plate into cylinders and cones on a plate roll – the method behind tanks, pipe, and pressure-vessel shells.
- Section bending (also called angle rolling) curves beams, angle, channel, tube and bar along their length into rings and arcs on an angle roll.
- Roll bending is the umbrella discipline that covers both, and explains how roll bending differs from continuous roll forming.
Materials: steel, stainless and aluminium
The same roll-forming process handles carbon steel, stainless and aluminium; the difference is in the tooling and the pass sequence. Softer aluminium profiles need tailored rolls and gentler passes so the surface is not marked, while high-strength steels need more roll power and a larger springback allowance. Matching the rolls, the pass plan and the machine to the grade is what keeps precision consistent across mixed material – and it is why SweBend sizes each machine to the job rather than selling one setup for everything.
| What it is | Shaping metal by plastic deformation – force, not cutting |
| Process families | Forging, extrusion, drawing, stamping, rolling |
| SweBend’s field | Cold roll-forming: plate rolling, section bending, roll bending |
| How the shape forms | Progressive bending between powered rolls, over multiple passes |
| Key variables | Roll power, drive torque, guide-roll support, pre-bending, springback |
| Materials | Carbon steel, stainless steel, aluminium |
| Typical outputs | Cylinders, cones, rings, arcs, spirals, large-radius curves |
| Rated by | Section modulus or plate thickness and grade, not press tonnage |
See the machines behind the process
SweBend designs and builds the plate rolls and angle rolls that perform every method on this page. High roll power and drive torque curve heavier stock in fewer passes, and SEVEN CNC with Wireless Bluetooth Control stores the pass sequence so a proven part repeats exactly – cutting flat ends, scrap and hand-finishing.
Frequently asked questions
What are the metal forming processes?
Metal forming groups into forging and stamping (pressing metal against a die), extrusion and drawing (forcing it through a die), and rolling (passing it between powered rolls). All shape metal by plastic deformation rather than by cutting. SweBend’s machines cover the cold roll-forming methods: plate rolling, section bending and roll bending.
What is the forming process?
A forming process shapes a workpiece by applying force that pushes the metal past its yield point into a permanent new shape, with little or no material removed. In roll-forming, that force is applied progressively by powered rolls across several passes, producing smooth, continuous curves instead of single creases.
Is roll bending a metal forming process?
Yes. Roll bending is a cold-forming process: it curves plate or a structural section between three or four powered rolls without heating the material for most grades. It sits in the rolling family of metal forming, alongside plate rolling and section bending.
What is the difference between forming and forging?
Forging is one metal forming process: it shapes metal by hammering or pressing it against a die, usually hot. Roll-forming is a different branch of the same family that curves plate and sections between rolls, cold, into rings, arcs and cylinders. Both deform rather than cut the metal.
What is cold forming?
Cold forming shapes metal at or near room temperature, so it keeps tight dimensional control and a clean surface without a heating step. SweBend’s plate rolling and section bending are cold roll-forming: the rolls curve the material progressively, and the operator allows for springback to hit the target radius.
