Since 1989, Expert in CNC Profile Bending Machines. 

Guide to the best
CNC Profile Bending Machines

Profile bending machine (also called section bending machine) is a machine that cold-bends a variety of metal profiles according to the principle of a three-point circle. It can curl the profiles into round, arc, spiral, and other workpieces.
How to choose the profile bending machine?

BIT profile bending machine produced in 1998


CNC profile bending machines (also called section bending machine, aluminum bending machine, and angle roll) is a machine that cold-bends a variety of metal profiles according to the principle of the three-point circle. It can curl the profiles into round, arc, spiral, and other workpieces.

Types of Profile Bending Machine

Suitable for bending aluminum profiles for automobiles, doors, and windows

PBA CNC Aluminum Bending Machine

It can bend copper, carbon steel, stainless steel, and aluminum profiles.
Angle, channel, beam, flat bar, round & square bar,pipe,square tube.


A small section bender, with manual and semi-hydraulic drives, can bend profiles other than the beam.

MS CNC profile bending machine

High-performance cold pipe bending machine, CNC control, multiple programs, multiple angle settings, simpler operation, and program settings.


Reliable profile bending machine – profile bending factory has 3 sets of angle rolls by BIT


CNC profile bending machines are the ideal machine for metal profile pre-bending and bending.

It is widely used in petroleum, chemical, shipbuilding, hydropower, metal structure, and machinery manufacturing industries.

3 rollers angle roll
4 rollers angle roll

About 3 or 4 rollers

PBH series has profile bending machines that come in 3-rollers or 4-rollers models.

The 4-rollers machine has one more pressure roller than the 3-rollers machine, which can clamp the profile more under the upper roller and improve the bending accuracy (when the precision of the three-roll machines bending die is very high, the four-rollers machines will also lose its unique Advantage), but it will make the operator's operation more cumbersome, while reducing the bending ability of the same model.

Whilst four rollers CNC profile bending machines produce fast, accurate bends, three roll machines are ideal for fabricators working with a wide range of material types.

profile bending working principle

Working principle

The relative position change of the workpiece (through the up and down movement of the upper roller shaft or the lower and upper roller shaft) and the pressure generated during the rotation movement in the direction perpendicular to the deformation of the profile itself cause the profile to produce continuous plastic deformation (make the outer layer of the profile Deformation) The fiber stretches, the inner fiber shrinks to produce bending deformation, the middle fiber does not change), and the workpiece with a predetermined shape is obtained at room temperature (we call it cold bending).

Bending method

Symmetrical bending

Symmetrical bending

Refers to the three rollers in a symmetrical shape (pyramid shape) during bending. The upper roller or the two lower rollers rotate in a symmetrical relative position at the center to apply pressure to the profile to produce plastic deformation
Disadvantages: It is not possible to pre-bend the profile. There are larger straight edges at the end of the workpiece after bending, which causes waste.

asymmetrical bending

Asymmetrical bending

Refers to the asymmetrical shape of the three rollers during bending. The upper roller and the two lower rollers move vertically at asymmetrical central positions, and the upper roller or the two lower rollers rotate to exert pressure on the profile. Produce plastic deformation. The end of the profile can be pre-bent.

5 tips for choosing the right profile bending machine

Choosing a CNC Profile Bending Machines may seem difficult but it really breaks down into a few simple steps. First, determine the maximum size and type of material you will be rolling. Next determine the types of profiles (angles, flats, tubes, etc.) that you will be forming. Lastly determine if you will be rolling material into one simple radius or if you will have or need the ability to have, the capability of forming variable radii.

profile bending machine

Yield strength

Regarding the yield strength of the angle iron roller, BIT machines are uniformly calculated based on the yield value of Q245 and have yield strength of between 36,000 and 38,000 pounds per square inch (PSI).

If you have special requirements, please indicate the yield strength of the metal material in the inquiry.

The yield value of Q245: refers to the yield value of this material, around 245MPa (34,075 psi).

Correctly sized

Whether operators are bending angle iron, tool choice is critical. The tools need to fit the profile yet not be so tight as to negatively affect workpiece shrinkage and growth. A tool that’s too tight can cause localized distortion and, at worst, actually gouge the material surface.

When operators need to bend an open profile like an angle, they have fewer distortion-mitigating tools at their disposal. Beyond tool choice and fit-up, angle iron roller must choose a correctly sized machine, one with sufficient forming tonnage and adequate grip lengths—enough to provide the needed leverage to reduce distortion, but not so long that they will require an excessively long sacrificial straight section, the long sacrificial flat section becomes expensive scrap, reducing the roll shop’s competitiveness.


BIT’s angle iron roller has the independent motion of the two side rolls allowing the operator to minimize the sacrificial unbent flat sections on the workpiece.

Again, typically a roll shop that bends a small workpiece on a large profile bending machine (section bending machine) must factor in a long flat section, which increases material costs.

But because the BIT profile bending machines move the way they do, an operator can move a joystick or push a few buttons on the control to reconfigure them into a smaller-machine orientation. Beyond this, operators can fine-tune the roll position to minimize the unbent flat even further.

Different bending capacities of angle rollers

The types of metal a profile bending machine can process largely depend on its bending capacity, we use the section modulus to evaluate the capabilities of the angle iron roller.

Capacity is one of the most notable differences between these profile bending machines, each angle roll has a section modulus rating.

Make a list of the materials and the size of the metal profile you work with on a regular basis and consult an expert to figure out what type of profile bending machine is best for you.

When determining which angle roll machine is best suited for the task one has at hand, it is important to research what each profile bending machine is designed to do and to understand the materials that one will be working with.

We provided detailed information about the section bending machines, such as capacity and yield.

View PBH Bending Capacity Table

Compare the information about how much force an angle iron roller can produce and what kind of metals (sheet, roll, etc.) it is designed to handle, and compare this to your site’s mill certificates or other relevant information to see which profile bending machine best fits your needs.

Below we also provide the processing capabilities of PBH Profile Bending Machines for your reference.

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Various cross section bending of metal profiles

List of our products: profile bending machine
Must know section bending information: a practical guide to the section bending of various metal profiles