Skip to content

Bending Beam,
H and I Beam Bending Machine

Due to the rapid development of China’s basic engineering, BIT series profile bending machines/i beam bender are more widely used in steel beam bending, such as the application of Chongqing Metro, a key project in China.

Bending Beam

Bending Profiles H-Beams
Bending Beam “Hard Way” And “Easy Way”

Rolled steel beams (Section Bending Universal Column) are used everywhere – in structures for functionality or aesthetic appeal, in circular shell stiffening rings on vessels, and for monorails or roof trusses. Steel beams can be rolled vertically (the weak axis) or horizontally (the strong axis). When rolling steel beams, it is important to consider distortion. Read More: What is Beam

Rolled steel beams (Section There are two primary methods used in beam bending applications, informally known as the “easy way” and the “hard way” .

Rolled steel beams (Section BBending beams and channels on the hard-way require a strong bending force because the section modulus along the x-x axis is always very large. Moreover the combination of the large bending forces required by the process with the relatively thin thickness of the beam cause the deformation of the web itself.

Notes: When the channel steel is bent horizontally, its work difficulty is equal to H-beam bending


Bending beam profiles photos

Read MoreBefore and after bending the beam in a hard way. What needs to be checked?

Three methods of bending beams

When attempts the bending of beams the hard way (x-x axis or against the strong axis), the result can be an unacceptable crippling of the web. So in the profile bending need use a variety of methods to avoid such deformation.

induction bending h beam
Hot bending beam
  • Cold roll bending beam: The profile bending machin(also called angle roller) can be configured to have additional rolls pulling on the outside flange of the beam rolled the hard way. The profile bending machine operator must balance the compressive forces of the main three rolls with the tension supplied by the rolls pulling on the flange to keep the web from distorting as the beam is curved.
  • Stretch bending beam: Stretch bending machines support a beam at two points and apply pressure to induce a curve. Without some sort of mandrels placed on the web between the flanges, only minimum cambers can be achieved with a cambering machine.
  • Hot bending beam: Induction benders heat a small section of a beam to make it more malleable during the bending process. After being heated the steel beam is pushed forward toward a swing arm which creates the curve.

Six Steps Of Beam Rolling With Profile Bending Machine

The beam is placed in the proflie bending machine and the operator adjusts the three rolls to the proper spacing before starting the bending process. Next is slowly begins rolling, and need frequently checks the beam for distortion of the web and flanges in these early passes. Several additional passes are carried out, with the operator measuring the overall radius after each pass to check the beam’s progress. The operator confirms the beam’s final radius, completing the bending process.The curved beam is lifted out of the proflie bending machine and moved to another area of the shop where the member’s geometry is checked one final time.

Six Steps

  • Steps 1#: Loading steel beams – the steel beam is inserted in between the top roller and the right lower roller. The steel beam can be supported if necessary and is not subject to deformation stress.
  • Steps 2#: The right lower roller up to the top roller movement achieves the pinching position – the steel beam is blocked in between the rolls and can be moved forward and backward rotating the rolls. The pressure exercised is lower than the one necessary to deform the profile.
  • Steps 3#: Pre-bending between the top roller and the left roller – the right roller slowly rises, starts rolling, and performs pre-bending between the top roller and the left roller.
  • Steps 4#: Working phase – in this phase the pressure increases and the deformation of the profile takes place, by translation of the profile and movement of the rolls.
  • Steps 5#: Pre-bending between the top roller and the right roller – The left roller is down and the right roller is raised. The steel beam is sent to the left and the three rolls begin rolling, pre-bending between the top roller and the right roller.
  • Steps 6#: Unloading of the steel beam – the pressure on the steel beam is eliminated and is increased the space between the rollers so that the steel beam can be extracted from the profile bending machine.


It is clear that, in order to load the steel beam on the profile bending machine/Beam Rolling Machine, a sufficient distance between the rollers must be present. It is also clear that, in order to block the profile in between the rolls and to apply pressure, it is necessary that this distance is reduced. Une or more rollers must be capable to move with respect to the others.

PBH I Beam Bending Machines

PBH Series section bending machine is a multifunctional machine, it can bend beams in hard-way or easy-way

every configuration . Beam and wide flange are both bent by BIT series section bending machine, from the very small sizes to the very large sizes. Its ability to bend wide flange and I-beam the easy way (against the weak axis) and the hard way (against the strong axis).

With PBH Profile Bending Machine able to bend the gamut of steel beam types including;

  • W-Beams (straight flange)
  • I-Beams/Junior Beams (tapered flanges for strength)
  • S-Beams (sloped inner flange, “American Standard” beams)
  • H-Beams (longer flanges)

Because we have up to 10 model PBH profile bending machines for curved steel beams, we make sure that we commend the profile bending machine/I Beam Bending Machine best fit for your job to reduce your cost and minimize tangent/trim at the ends(Unbend flat end).

Unbendable flat end

When beams are run through any profile bending machine there each end of the beam has a length that can be unbent, because it is not in contact with the top roller. This part of the residual unbend flat is difficult to completely eliminate during the roll bending process, and it is easy to produce quality and equipment accidents, so it should be prevented.

When bending on a common profile bending machine(symmetrically bending), the remaining unbend flat is usually about half of the center distance of the lower roller, which is also related to the thickness of the beam. With the PBH Profile Bending Machine(asymmetrical bending) the unbend flat end is approximately 1/6 to 1/10 of the symmetrical bend.

Read More: Steps Of Curved Steel Beams – Steps 3#

Video of 4-roll and 3-roll section bending machine bending H-beam

h beam bending machine
Rolling Beam with PBH Profile Bending Machine
I beam bending machine
PBA CNC Profile Bending Machine
Beam Rolling With PBH 4-Roll CNC I Beam Bending Machine

High bending precision, superior performance, the best choice for bending beam, BIT series beams bending machines ensures even the most demanding beam forming projects are completed on time and to industry-required guidelines.

Read More: Profile Bending Machine: 5 Things Must Consider Before Purchasing

Specifications of PBH Profile Bending Machines

h beam bending machine
h beam bending machine

Due to the rapid development of China’s basic engineering, BIT series profile bending machines are more widely used in steel beam bending, such as the application of Chongqing Metro, a key project in China.

Hard WayEasy Way
Inside Diameter
Inside Diameter
PBH-120  120600
PBH-140  140600

4-roll H/I-Beam bending machine photo

BIT is a machine customized by China Sany Heavy Industry. It can be seen from the mold that it can process and bend beam and channel profiles.

Of course, it can also be replaced with our combined mold and pipe mold to bend various types of materials to become an ordinary profile bending machine.

i beam bending machine
Beam cold bending machine

The CBM cold bending machine performs cold bending deformation of various types of steel(I beam, H beam, U channel) according to a certain radius of curvature according to the requirements of construction and use, without changing the internal stress of the section steel, so that the section steel achieves the purpose of bending deformation without changing its mechanical properties and strength.

CBM series profile cold bending machine has a simple structure, reliable performance, and low price. It is the most economical choice for outdoor engineering bending beams.

cold bending machine
Cold bending machine
beam bending machine
Cold bending machine

It reduces labor intensity and labor costs, improves work efficiency and cold bending machining accuracy, and is one of the first-choice equipment for processing steel arches.

The hydraulic beam cold bending machine adopts a hydraulic system, which has the characteristics of stable transmission and high pressure, which can accurately locate and greatly improve the processing accuracy of tunnel I-beam and H-steel.


It is widely used in the bending of I-beam, channel steel, and H-beam in highway tunnels, railway tunnels, subway tunnels, water conservancy, hydropower diversion culverts, natural gas pipelines, communication pipelines, and underground passages, and other projects.

Main parts

The beam bending machine consists of two sets of main motors, a reducer group, and active rollers. Passive rollers and oil pump motors, gear pumps, relief valves, solenoid steering valves, and hydraulic workstations are composed of working cylinders and other components.

How to bend the beams with CBM H & I beam bending machine

When the I-beam cold bending machine is working, the beam to be cold-formed is pushed by the door bracket of the system and placed between the two active rollers, and the hydraulic system is activated to make the hydraulic cylinder push the dovetail groove, and the cold-formed roller cold-formed steel. When the arc required by the design is reached, the hydraulic system is closed, and the mechanical transmission system is started, so that the active roller rotates and drives the section steel to move forward steadily and slowly by friction, thereby realizing continuous cold bending operation.

At the end of the cold bend, close the mechanical transmission system and start the hydraulic system at the same time to retract the hydraulic cylinder. Place the cold-formed beam on the door bracket of the system.

This cold bending operation ensures the strength of the material, improves the quality of the beam (supporting steel arch), greatly improves the work efficiency, and the operation is simple and clear.

The H beam (metal workpiece) is placed inside of an induction coil, which, when turned on, heats localized sections of the H beam to temperatures ranging between 1750° F to 1850° F. The exact sections depend on the part design and the exact temperature depends on the base material. As each section reaches the correct bending temperature, the machine slowly moves the H beam through the induction coil as a fixed radius arm mechanism applies the necessary force to bend the workpiece at the heated area. When the H beam exits the induction coil, it is immediately quenched with water to minimize thermal expansion.

This process can take up to an hour since it must occur gradually to avoid snapping or deforming the structure.

Also, read: H-BEAM & I-BEAM bending process