What is bending used for?

Metal bending is a type of plastic deformation that permanently and irreversibly changes the shape of metal profiles and sheets.  Among the various forms and shapes that steel comes in, sheet metal is the most versatile and easiest to work with.  Other forms of metal include tubes and sections, both of which can also be bent using SweBend bending machines.

Tubes, pipes, and sections often need to be bent to be used in several manufacturing applications, including gates, railings, and raw materials for other industries such as the automotive or aeronautic industries, ventilation systems, and electrical towers.

In addition, sheet metal is usually bent to increase its stiffness and strength and change its appearance for its final use, usually for much heavier applications such as cargo ships, rail and road fluid tankers, wind towers and turbines, and pressure vessels.

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How do you use a bending machine?

Before bending and forming metal, you should be equipped with the necessary work instructions for bending machines. The machine’s electric connections must be secure and free from dirt or oil contamination. Check the hydraulic fluid levels and look out for breaks, cracks, and other lesions before startup.

When switching the machine on, ensure that the work area is clear of unneeded personnel and equipment to reduce the risk of accidents. Analyse the metal to be bent and select the appropriate bending option from the control panel.

Insert the material to be bent or rolled parallel to the bending machine and provide support if necessary to prevent the machine from toppling over. Ensure that the machine is well-lubricated before each use to enable smooth operation and prevent damages or marks to the rolls or material.

Finally, press the “start” button on the SEVEN CNC panel. Sufficient knowledge of how to use bending machines is critical to smooth and safe operation.


There are three main types of tube bending: press bending, roll bending, and rotary draw bending. Other forms are not distinctly different from the three mentioned here but rather their extensions.

Press bending, as the name implies, is when a press brake (usually hydraulic) is used in combination with fixed supports on the other side to introduce a bend in a tube. It is the simplest and cheapest form of tube bending but brings low accuracy and replicability with it.

Roll bending pulls the tube through assemblies consisting of three or four rolls, bending it in the process. This is like press bending in that they both utilise opposing forces to shape the tube.

The third and most popular type is Rotary Draw bending which utilises a three-die system to shape the tubes. The clamping die of this three-roll bending machine holds the tube in place, while the pressure die and radius die shape the tube into the desired radius by ‘drawing’ the tube around them, either electrically or hydraulically. It not only produces accurate and replicable results but also does so in an affordable manner.

Please note, you must be aware of pipe bender safety precautions before starting operation, as will be discussed later.

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Among the SweBend section bending machines we offer is the Section Bending 3 roll Special (SB3S) series offering thirteen different models with a range between 7 and 18000 cm3 (0.4 and 1100 in3).

To relate this to the types of tube bending we talked about earlier, the SB3S series uses roll bending. This range is more powerful than any of its market competitors and uses cutting-edge technology in the form of hydraulically operated guide rolls, which further sets it apart. The guide rolls in the three roll bending machines can be adjusted independently around three axes: around their axis of rotation, in and out of the machine frame where they are affixed, and in the plane of rolling. We also modify this series to client demands, providing more control over roll adjustments.

We are happy to answer any questions you may have, please contact us…



Sheet metal can be bent by using SweBend’s PBX series, PB3 and PB4. The sheet metal bending equipment in these series are among the most versatile and universal machines on the market. The PB4 series is equipped with market-leading CNC technology, which makes it even more precise and effective for replicable results.


As with all manufacturing and augmenting machinery, sheet metal bending tools must also undergo risk assessment. Machine safety and general safety rules in bending and stretching, specific to the equipment you will be using into consideration. In general, always keep the following 10 safety rules for sheet bending in mind:

  1. First and foremost, always wear appropriate and complete Personal Protective Equipment (PPE) before approaching and operating bending equipment. This includes, but is not limited to, safety goggles, safety gloves, and work boots to prevent contact and possible injury caused by sharp metal edges. Welder helmets may also be required to prevent projectiles from coming in contact with the operator’s face.
  2. Before operating the tool for bending, read and understand its instruction manual, focusing on the machine’s functioning and working principles. This precaution prevents accidents from occurring due to a lack of know-how about the machine.
  3. Every new operator should be appropriately trained before using the machine for the first time, preferably by an experienced engineer well-versed in bending machine safety precautions. In addition, to promote learning and ownership, the operators may be asked to review and recommend changes in the safe manufacturing practices of these equipment.
  4. File metal burrs properly, and avoid touching metal edges or cuts, even while wearing gloves.
  5. Wet metal sheets should be given extra attention to and handled with the utmost care. The moisture, mixed with oils and dirt, can result in very slippery surfaces, making them addedly hard to grip and more dangerous to work with.
  6. The sheet metal should be placed parallel to the bending machine before starting operation. This correct placement will prevent contact with the sheet with the operator, avoiding injury.
  7. When working in cold weather, warm up the machine before use to ensure efficiency and reduce the risk of stressing the machines. This can be done by turning on the machine and letting it operate empty before inserting any metal to bend.
  8. The work surface should be clean and free of any scrap metal. Paying attention to where your hands are during operation is also paramount to preventing accidents.
  9. The machines should be inspected regularly before each operation, especially before the initial startup. These regular inspections help keep the machine in its intended and safest condition, enabling operation at maximum capacity and efficiency and reducing chances of injury.
  10. Ideally, metal bending equipment should be automated and remotely controlled. Our machines leverage this capability by coming equipped with Bluetooth-operated wireless control devices. These customizable devices give complete control to the operator while allowing them to stand at a safe distance and moving around the machine for more visibility.
Swebend retrofit control upgrades

SweBend’s Bluetooth control device, compatible with virtually every metal bending machine in the market


Another possibility of injury may arise due to increased temperatures of the metal you are working with. These temperatures may occur due to an open-source flame or heating of the metal due to the transformation it is going under. This is especially dangerous when tubes are involved as they tend to hold more heat energy inside their metal body. Touching hot pieces of metal or metal components of the tool for bending can result in severe burns and should therefore be avoided as well. Yet another one of pipe bender safety precautions is small particles, which may end up in the respiratory tracts of operators. To prevent this from happening, wear proper PPE.

Repair, Service & Support

Unrivalled experience in service and repair plus access to original machine data files and support from OEMs means we can deliver fast, cost effective resolutions to ensure that your machines are always up and fully operational. We offer a variety of technical support packages tailored to your individual needs and machine requirements with the provision of daily, weekly, and monthly service checks between annual services plus intervention in the case of unplanned maintenance or breakdown and training for customer engineers enabling more autonomy.

Repair Service Support

Roundo Spare Parts

In April 2016, following a bankruptcy and ownership transition, Roundo® closed operations in Sweden. WJS Machine Tools is able to offer full technical support and service to Roundo machine owners in the UK  with our access to a huge stock of parts and support to keep your Roundo machinery running at full potential for many years to come. In addition, with access to former Roundo engineers as well as electronics and design staff, WJS Machine Tools are without doubt best placed to provide support in the UK for these machines.

“Our business succeeds on the Worldwide market by delivering quality parts, on time and at a competitive cost. Often, our major structural contracts are won on capability to deliver against challenging designs in a world of ever more complicated geometries. Working with WJS Machine Tools and their partners has allowed us to develop machines for this purpose”

CB – Section Bending Specialist


We are happy to answer any questions you may have, please contact us…