In terms of steel fabrication gear, you will have heard of an angle roll bending machine. Some could confer with it as a bit bending machine, however its function continues to be the identical – type uncooked items of steel into desired styles and sizes. read more about┬ác channel bar

You probably have ever seen an angle roll bending machine, you’ll agree that almost all are constructed in a vertical metal body. It is not uncommon that the bending portion of the machine is positioned on one facet, with the ability and drive of the machine on the other facet.

This writing is meant to teach and assist the purchaser of Angle Bending Machines to ask the correct questions when contemplating a purchase order.

Energy supply:

Small items are powered by an electrical motor with a reducer. The ability transmission is completed by gear trains and or chains / sprockets combos. These are items utilized in small job retailers and rod iron fabricating institutions. The brand new technology of the part bending machines is powered by hydraulic methods. These are used for bending from the smallest bars to very giant huge flanged structural beams.

The big hydraulic items have a double pump hydraulic system, with one offering the movement for the rotation of the rolls and the opposite for the extension and retraction of hydraulic cylinders hooked up to arms carrying the bending rolls.

Some designs use one fundamental hydraulic motor, often mounted to an epicyclical in-line discount gear, which imparts rotation to all three rolls. One other variation is every roll having its particular person hydraulic motor/ discount field mixture instantly driving it.

The Bending Course of:

There are some phrases used within the business describing the capacities of Part Bending Machines and the method used, which the purchaser ought to change into acquainted with.

Sq. and rectangular rods, spherical rods, sq. and rectangular tubing, spherical tubing, normal pipe, equal leg and unequal leg angles, “C” and “MC” channel, “S” and “WF” beams, “T” bars …these are sections which might be rolled on part bending machines.

“Leg out” means the leg of a bit, like in angles will stick outward from the ring fashioned in a radial course. “Leg in” means the leg of a bit, like in angles will stick inward from the ring fashioned in a radial course towards the middle of the ring. “Leg out” is also referred to as “Simple method” and “Leg in “Exhausting method” There are exceptions to this terminology relating to channels, whereby one can bend a channel leg in, leg out and the laborious method when bent on its facet.

Bending of spherical sections, pipes and spherical tubing require particular tooling apart from what’s often supplied normal with part bending machines. In particular circumstances with sq. and rectangular tubing the place the wall thickness is low…the producer needs to be consulted as as to whether particular all part enveloping tooling is required to keep away from the part from collapsing below the bending forces.

Bending Channels, S beams and WF beams the laborious method, current a particular problem as a result of the pressure of bending would generally collapse the net connecting the flanges. Most producers of heavy part bending machines provide what is known as a “Traction Instrument”, which holds the part again and helps the net in order to keep away from collapse.

Machine Capability:

Every part has what is named a “Part Modulus”. This worth is a measure of the resistance a bit shows to bending. It’s the quotient of the sections Second of Inertia in regards to the axis passing via its middle of gravity, which coincides with the impartial axis of the part and the furthest distance on the part from that impartial axis. In symmetric sections bending in regards to the impartial axis each methods will give the identical part modulus, nevertheless in non symmetric sections, the part moduli are completely different for calculations of leg in and leg out bending.

Relying on the design of the machine, every machine could have a sure capability of bending. Thus the stress exerted on the machine members will dictate the restrict, earlier than rendering the deflections the members maintain unacceptable or the damage and tear induced on the machine can be extreme. This restrict is what’s specified as W or S (Part Modulus Capability) in in3 or cm3.

Generally catalogs and brochures describing part bending machines would give the utmost part sizes a machine can bend of every sort of structural or bar part. With a minimal diameter the machine can bend them to. By rule of thumb and observe it has been established that the minimal diameter of bars, tubes and pipes is ten instances the peak of the leg or the dimension taken within the radial course. For the remainder of the sections it’s roughly 11 to 12 instances the peak of the part or the leg.

When a bit dimension and thickness just isn’t talked about on the capability charts, the person both must calculate the part modulus of the part and if that is lower than the Part modulus capability of the machine, he/ she shall be within the protected zone and no injury will come to the machine. If doubtful it might behoove the person to contact the producer for skilled recommendation.


Part bending machines have change into subtle and are utilizing NC and CNC to bend difficult kinds. These controls have canned packages for traditional sections and so they use educate mode the place by the operator can produce the half manually and the machine retains observe of all of the steps he/ she makes use of to perform the job. Then this system is memorized and archived for steady use.

The brand new controls may even accumulate their very own part attribute knowledge, by bending a bit of the part at completely different settings. The radius produced at a sure setting is enter into this system and by taking three readings, this system surmises the response of the part to bending forces; then makes use of the data when this system parameters are entered and the half is run…at first trial the machine would produce a close to good half. With small changes, what used to take hours of testing, experimenting and creating is lower down drastically.

Controllers have giant reminiscence capability and lots of job packages are saved and recalled simply. Most items have RS232 communication functionality and currently USB ports have been showing on most of them. There are various working methods used on these controllers…some are nonetheless utilizing DOS, some use Home windows and even Linux, whereas some have proprietary working methods.


With every passing day, expertise is bettering, and that is no completely different for angle roll bending machines. Computer systems and engineers are largely liable for part bending machine building, and this permits for extra exact gear. Some inexperienced buyers could bounce at a machine with higher horsepower and even one which weighs extra. Don’t be fooled; as an alternative take into account these items when shopping for: reliability and sturdiness of supplies used within the machine’s building, stable design, and naturally ease of upkeep.