Angle Roll Bending Machine Information for Buyers

In the realm of the fabrication of metal you might have seen an angle roll bender. It is sometimes referred to as an bending machine for section, however its function is the same: create raw metal pieces into shapes and sizes that you want.

If you’ve ever seen an angle roll bending machine, you’ll find that they are built on an upright steel frame. It is normal that the bending part that the device is placed on one side, and the drive and power of the machine situated on the other side.

This article is designed to help educate those who purchase Angle Bending Machines to ask the right questions when evaluating buying.

The source of power:

Smaller devices run on an electric motor that has reduced. The transmission of power is done through gear trains chains or sprockets. These are the machines employed in small work factories and rod iron fabrication establishments. The latest generation of section benders operates on hydraulic system. These machines are used to bend starting from the smallest bar to huge beams with wide flanges.

The larger hydraulic units feature two pumps in the hydraulic system that includes one pump for the flow needed for the roll’s rotation as well as the extension and retracting of hydraulic cylinders that are attached to arms that are carrying the bent rolls.

Some designs have a central hydraulic motor, typically attached to an epicyclical reduction gear, which gives rotation to the three rolls. Another option is each roll being equipped with an individual reduction box/hydraulic motor combination driving it directly.

The Bending Process:

There are a few terms that are that are used in the business world to describe the capabilities for Section Bending Machines and the procedure used to achieve them. buyer needs to be aware of.

Rods for square and rectangular shapes round rods, square or rectangular tubing standard pipe equal leg and non-equal leg angle, “C” and “MC” channel, “S” and “WF” beams, “T” bars …these are sections that can be bent on section machine bending like bending press machine.

“Leg out” means the section’s leg as in angles, will extend outwards from the ring that is formed in an radiating direction. “Leg in” means the section’s leg similar to angles, will move into the ring in a radial axis towards centrality of the band. “Leg out” is also often referred to as “Easy way” and “Leg in “Hard way” There are some exceptions to this definition in the case of channels, in which one is able to bend a channel leg legs out, in, or the hard way after being bent to the side.

Bending of round sections pipes , and round tubing needs special tools other than that which is normally provided by section benders. For special situations involving rectangular and square tubing, where walls are low…the manufacturer must be consulted to determine if the use of a special tool for section enveloping is needed to prevent sections from collapsing due to the force of bending.

Bending Channels S beams, WF beams and S beams by hand, pose a particular challenge as the force of bending could occasionally cause the web to collapse between the Flanges. Many producers of heavy section bend machines provide the term “Traction Tool”, which keeps the section in place while supporting the web in such a way that it does not collapse.

Machine Capacity:

Every section has what’s called an “Section Modulus”. This is a measurement of the resistance of a section to bend. It is the ratio of the sections Moment of Inertia about the direction of its center of gravity that is in line with the neutral section’s axis as well as the distance that is the most distant on the section to that neutral axis. In symmetric sections, bending around the neutral axis in both directions will yield the same section modulus. In non-symmetric sections, the moduli are different in calculation of the leg-in and leg-out bends.

Based on the style of the machine every machine will have an optimum capacity for bending. The pressure applied to the machine’s members will set the limit before making the deflections they endure unacceptably or , the wear by the machine is excessive. This limit is is known in the form of W (Section Modulus Capacity) in cm3 or in inches.

In general, catalogs and brochures that describe section bending machines will provide the maximum size of sections that a machine is able to bend every kind of bar or structural section. The minimum dimension, the machine is able to bend them up to. As a rule of thumb and experience, it is known that the minimal diameter for tubes, pipes, and bars is ten times the length of the legs or of the measurement measured in the radial direction. For the remaining sections, it’s approximately 11-12 times the length of the section or leg.

If a section’s dimension and thickness isn’t mentioned on the charts of capacity the user has to determine the modulus of section of the section. If it is lower than the capacity of Section modulus that the equipment has, then heis safely in the zone, and no harm will be caused at the machinery. If there is doubt, it would be in the best interest of the user to call the manufacturer for advice from a professional.


Section bending machines are becoming sophisticated and use NC or CNC to bend intricate shapes. They are equipped with canned programs for standard sections. They employ a teaching mode in which an operator can create the component manually and the machine tracks every step he/ performs to complete the task. The program is then stored and stored for future use.

The new controls even gather their own section’s characteristic data by bending the section with various settings. The radius that is produced when bending a section is entered into the program. After taking three measurements the program determines the response of the section to bending forces. It and then it uses that information when the parameters of the program are input and the piece is run…at first , the machine will create a nearly perfect piece. With a few adjustments, what was once require hours of testing, making and experimenting is now reduced drastically.

Controllers are equipped with a large memory and a lot of job-related programs can be easily saved and can be recalled. The majority of controllers have RS232 communication capability , and in recent times USB ports have appeared on the majority of them. There are a variety of operating systems that are used by these controllers…some remain using DOS while others are using Windows and some even Linux and some even are running exclusive operating systems.


Each day technology advances and this isn’t more true for benders for angle. Engineers and computers are involved in section bending machine design and this enables better-quality equipment. Unexperienced buyers might be tempted to buy a machine that has more horsepower, or which weighs more. Don’t be deceived take into consideration these factors when purchasing quality and longevity of the materials used in machine’s construction, its solid design, and of course , the ease of maintenance.