What Is A Bending Machine?types, principle, and application

A bending machine is a machine used to bend and shape workpieces.

There are many types and functions of bending machines, which can be used either as presses or as bending machines.

Some bending machines can process sheet metal directly without fixtures, while others require fixture-assisted bending.

The sheet metal is held in place by a clamping device and remains in position throughout the process.

The bending machine uses a bending tool to shape the sheet metal and create the desired contours.

The body and tools of the bending machine must be made of special materials to ensure that they can withstand the pressure applied during the process without damage.

Types of Bending Machines:

There are several types of bending machines, including duct bending machines, sheet metal bending machines, sheet folding machines, hydraulic bending machines, mechanical bending machines, electric servo bending machines, electric duct bending machines, and cutting and punching machines, among others.

Duct benders

What is a duct bender?

A duct bender is a machine used to bend metal ducts and profiles into various shapes.

Profiles are usually square or rectangular in shape and made of thick metal.

Bending is a stretching process that creates friction between the duct and the bending tool.

To prolong the life of the tool and the bender, drawing oil can be used to reduce the resistance between the duct and the tool.

Duct bending and fabrication equipment are used to perform a variety of operations such as bending, profile forging, flaring, and crimping.

Duct benders can bend a variety of metal materials such as stainless steel, iron, copper, aluminum, titanium, and carbon steel.

These materials have a high degree of ility and small elastic deformation, which makes them suitable for structures that support bent sections.

The duct processed by the bender has a smooth and even curve, without external collapse or internal folding.

Ducts are hollow vessels that are widely used to transport gases, solids, and fluids in various industrial, medical, and other equipment.

A duct bender is mainly used in construction, highways, railways, bridges, and other construction projects in the laying of ducts.

Bender structure

The duct bender consists of a clamping die, bending die, pressing die, trimming die, mandrel, and so on.

The bender’s dies are usually made of hardened steel to withstand the bending process and prevent damage.

However, tools such as scraper dies are made of softer materials, such as aluminum or brass, to prevent damage to the bent duct.

Bending dies

The bending die, also known as the radius, die, is a key part of the rotary drawing process.

It holds the duct in place and bends it during the drawing process.

The shape of the bending die determines the inner diameter of the bent duct.

Clamping dies

The clamping die is used in conjunction with the bending die to hold the duct in place and prevent it from slipping during the bending process.

Wiper molds

The trim die makes the surface of the bend smooth and prevents the collapse of the inner radius and damage to the outer surface.

The wiper is made of a softer material, such as aluminum or brass, and helps to prevent damage to the duct.

Pressing dies

The compression die is used to apply pressure to the duct during the bending process, ensuring a consistent and accurate bend profile.


Mandrels are used to support the bending of small radius ducts, fine ducts, and hard materials.

They work in conjunction with the scraper dies to prevent the duct from wrinkling on the inside and collapsing on the outside during the bending process.

How does a duct bender work?

Duct benders work by applying pressure to the duct. The source of this pressure can be hydraulic, electric servo, pneumatic or manual.

The duct is first clamped into place by the clamping block and forming tool and adjusted to the shape of the mold.

It is then held in place as one end of the duct is rotated and rolled around the mold.

There are other ways to machine the duct by rolling to form the profile.

When bending a duct, a mandrel is usually inserted inside to prevent the inside of the duct from collapsing and puckering.

The bender’s scraper helps to maintain tension on the duct and prevent damage when it is stressed.

The scraper dies are usually made of aluminum or brass and help to prevent scratches in the raw material.

There are several methods of duct bending with duct benders, including press bending, spin-draw bending, press bending, roll bending, mandrel bending, scraper bending, heat induction bending, sand pack hot slab forming, and press bending.

Sheet metal bending machine

Sheet metal bending machines are used to form sheet metal into specific profiles.

The sheet metal is positioned on the lower die of the table and then pressed through the press to complete the bending process.

The movement of the ram, driven by the power system, causes the punch to move downwards.

This type of machine can bend sheet metal or ducts to any angle. If the machine is specifically designed for duct bending, it is called a duct bender.

Sheet metal bending machines are suitable for processing larger workpieces that cannot be handled by other machines.

The workpiece is held firmly in place by a clamping axis driven by the power system.

Once the workpiece is fixed in place, the bending arm of the swing beam swings in an arc to bend the flange to the required angle.

Plate Rolling Machine

A pyramid-type mechanical plate bending machine is utilized for bending and forming metal plates.

The bottom roller is powered by a motor and gear and can rotate.

The upper roller’s required bending radius can be adjusted manually up and down.

The steel plate bending machine features a double-sided pre-clamping device, with a unique structure that enables the two bottom rollers to pre-clamp the workpiece.

The upper roller is fixed and pre-clamped by the two lower rollers through hydraulic cylinders.

Press Brake

Press Brake is a type of bending machine that is used for bending metal plates.

There are various types of press brakes that are powered by different systems.

The press brake has at least three shafts on the rear gauge, which allows for control over the accuracy, speed, and stroke of the machine.

It is easy to operate and can process workpieces in bulk.


There are several types of bending machines available, including pipe bending machines, metal plate bending machines, and plate rolling machines. Each type of machine has its own advantages and disadvantages, and the best machine for the job can be chosen based on the production requirements.

Factors such as the required production process, output, and budget should be considered when selecting a bending machine.

Our company offers a comprehensive range of metal processing solutions, including shearing machines, laser cutting machines, press brakes, slotting machines, etc.

If you need help selecting the right metal processing solution, please do not hesitate to contact us, and one of our sales representatives will be happy to assist you.

Learn more about shearing machines, bending machines, and other sheet metal equipment. For the best price, please contact us.

Fengli Machinery Group Machine) Work) Work) (Industrial Blades)


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