Tube bending: mandrel bending or empty bending - DIMAKIN Machinery
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Tube bending: mandrel bending or empty bending

There are two main ways to perform tube bending. Mandrel bending, or mandrel-less bending, also called empty bending.

During mandrel bending, as the name suggests, a supportive mandrel is inserted into the tube. This prevents it from breaking or wrinkling during the bend. This is particularly important when bending thin-walled material. This is since the thinner walled material has less structural integrity.

Empty bending, on the other hand, is the action of putting a radius in hollow materials such as tube or pipe without the use of a mandrel. Because you are not using a mandrel to support the material from deforming, empty bending is more often performed with material with thicker walls. Greater wall thickness allows it to support itself during manipulation and can resist deformation and wrinkling during the process.

Types of Empty Bending

While DIMAKIN currently does not supply mandrel benders, it carries a great range of empty bending machines. Depending on whether you need tight radii for handrails and, or large sweeping bends for gates, DIMAKIN has you covered.

Tube Benders or Rotary Draw Bending

If you’re bending a tight centreline radius, you’ll be looking for a rotary draw bender or tube bender. Rotary Draw Bending is the act of pulling, or drawing, your material through dies to form a bend. Due to their nature, they are best suited to bending tight radii in material with thicker walls.

With a DIMAKIN machine, the material is hooked into a former die, and pressed securely to a brass counter die. With the simple press of a foot pedal, a pre-programmed DRO rotates the forming die, and pull through the material. Once material spring back is accounted for, your Tube Bender machine can bend consistently. Reliably bending with an accuracy of ± 0.05° for great repeatability, bend after bend.

Built in Portugal to the very highest EU standards, DIMAKIN’s tube and pipe bending ranges are among some of the best tube and pipe bending equipment in the world.

Ring Rolling

On the other hand, if you are bending large, sweeping radii for applications such as gates or arches, you need a ring roller. Sometimes called a section bender, or a roll bender, these machines use rollers to pass through material while applying pressure. Pressure is applied with the descent of a top roll, allowing it to form a large CLR (centreline radius) bend.

Depending on your application, you may consider whether you want hydraulic descent or manual descent top roll, along with multiple options for repeatability technology. If you are doing bespoke, one off applications, a precise DRO may not be necessary. If you need perfect repeatability, it definitely will be on your check list.

DIMAKIN can accommodate machines from simple ring rolling machines. These machines are as simple as a foot pedal and a notched scale; perfect for one-off bespoke bending. Alternatively, a fully CNC driven machine, complete with DRO (digital read out) and powerful hydraulic top roll descent.

Do you have any questions?

Whatever your application, DIMAKIN can provide the perfect machine for you. If you have any more questions, or would like to learn more about DIMAKIN’s range of tube and pipe bending machinery, call 02476210123 or email sales@dimakin.co.uk! We look forward to hearing from you!


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