Because the machine stretches the tube, there is a constant tension on the material. Then the profile is wrapped around a form die while still being stretched. The tube is stretched to its yield point. Both ends of the tube are inserted in the gripper jaws. It is a very accurate method.Ī tube or section is placed in the machine. Stretch bending is a bending method developed for the aerospace industry and is now used for architectural purposes as well. Kersten has the capacity to mandrel bend tubes up to Ø159mm. However, this advanced bending process requires specific knowledge and special machinery and tooling. This is a flexible process to achieve tight radii in combination with minimal deformation of the cross section. The tubes are supported from the inside with a flexible mandrel. This prevents it from collapsing and folds. When a mandrel is used to bend a tube there is a tool inserted into it to support the tube from the inside. Mandrel bent tubing retains the same inner pipe diameter in bends. To prevent wrinkling on the inside radius or collapsing, the mandrel bending offers a good solution! Mandrel bending is the ideal method for bending tubes in very tight radii. We have the capacity to bend tubes with diameters starting from Ø 13,5mm up to Ø 610mmįor even larger tubes, or if a very small or very large radius is required, we use the induction bending technology. Both light and heavy tubes and pipes can be bent by Kersten. Kersten has an extensive range of modern (CNC-controlled) three-roller bending machines.
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