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High-quality Profile Bending Machine Manufacturer in China.

Profile Bending Machine

Since 1989, Experts in user-friendly CNC Profile Bending Machine. Steel Bars, Angles, H and I Beams, Channels, Tubes, Pipes Bending Made Easy.

What is Profile Bending Machine?

Profile bending machine is equipment for the radial forming of metal profiles. It works similarly to a plate rolling machine. However, its design is much more complex.
Reliable profile bending machine

Profile bending machine (aka section bending machines, and angle roll) is equipment that cold bending metal profiles according to the principle of the three-point circle. Profile bender can curve a wide variety of metal profiles (such as carbon steel, stainless steel, aluminum, copper, etc.) into round, arc, spiral, and other workpieces.

Working principle

profile bending machine
BIT profile bending machine produced in 1998

The working principle of the profile bending machine is roll bending, it is a process whereby we obtain cold process deformation with a wider bend radius that theoretically can range from 5 times the cross-section to infinity.

The metal profile is made to pass through a set of three rollers that, after one or more passages (depending on the difficulty of bending), will form an arch with the required radius of curvature. Roll-bending is, generally speaking, a simpler process than bending.


The profile bending machine is widely used in petroleum, chemical, shipbuilding, hydropower, metal structure, and machinery manufacturing industries.

First of all, the curving of standard mill shapes—angles, bars, beams, channels, tees, pipe, and tube, are all part of the bending function of the profile bending machine. Also can bend the case that aluminum extrusions, even extremely complex sections of aluminum, can be rolled and formed into a ring with a profile bending machine.

Types of BIT Profile Bending Machine

aluminum profile bending machine

Up to 15 Independent Controllable Servo Axes. CNC control. Accuracy is as high as ≤0.01mm.
Suitable for bending aluminum profiles for automobiles, doors, and windows

PBA Profile Bending Machine

w24s profile bending machine

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


cnc tube bending machine

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


plate bending machine

PBR Bending Machines are engineered for metal plate bending for safe operations and unparalleled maximum flexibility while offering the latest in features and advanced technology.

PBR Profile Bending MACHINE

BIT 3-roll & 4-roll Double-pinch profile bending machine

bending process of 3-roll section bending machine
bending process of 3-roll profile bending machine

PBH and PBA series double-pinch profile bending machines that come in 3-roll or 4-roll. The Double-Pinch Bending Machine with High-Precision, High Productivity, and Long-Term Reliability.

The advantages of double-pinch machines

angle roll
3-roll profile bending machine

3-roll double-pinch angle rolls are economical profile bending machines that are relatively easy to operate. The side rolls are positioned to the right and left of the top roll and are on the same axis.

The axis of each roll helps make the bend. The “back” side roll (at the far side of the feeding point) also functions as a back gauge to square the plate for proper alignment. This eliminates the need for someone to assist the operator. Three-roll, double-pinch section bending machines do not require the operator to remove, flip, and then try to square the plate a second time after pre-bending, as is the case with three-roll, initial-pinch machines.

bending process of four-roll section bending machine
bending process of 4-roll profile bending machine
angle roll
4-roll profile bending machine

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, 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.

Working principle

The double-pinch profile bending machine has two bending modes: symmetrical bending, and asymmetrical bending.

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).

Symmetrical bending of profile bending machine
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 of profile bending machine
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.

Yield strength

Regarding the yield strength of the angle iron roller, BIT machines are uniformly calculated based on the yield value of Q235 and have a 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 Q235: refers to the yield value of this material, around 235MPa.

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 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 the PBH Profile Bending Machine for your reference.

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Various cross-section bending of metal profiles