tubing bending jig chart radius sprinback

This is how the tube will spring back a few degrees in the direction of the bend when released from the tools. It is necessary of course to differentiate ANGULAR SPRINGBACK from RADIAL GROWTH. One common defect is the change in the radius of the bend and the change in the angle of the bend after the end of a bend due to springback. In essence, all are only theoretical and neglect external influences. The calculation for the thickness of the walls on the outer radius for the bending depends on many relationships. The materials of the tube and the equipment used should also be considered. The parameters of the tube bending are crucial (OD, CLR, WT), but there is also a significant impact from the tools and how they are set up. There are many other factors which can lead to the thinning of the walls during a bend.

It is very effective to reduce the thinning of the walls with a so-called Booster, which is essentially just extra pressure that pushes on the tube in the direction of the bend and reduces the tension on the inner diameter of the bend. However, you can greatly decrease the amount of thinning on the outer radius by selecting the right choice of tools and setting them up properly. The thinning of the walls on the outer side of the radius of the bend naturally occurs when you are bending tubes. Reduction or limitation of wrinkling can be achieved by properly setting up the appropriate mandrel and wiper die. It is due to pressing forces caused during bending. This is where the stability of the walls is lost on the inner radius of the bend. The flattening can be monitored by using the coefficient of ovalness: Flattening of the cross-section of the tubeįlattening of the cross-section of the tubes is caused by the distribution forces through the bend and can be greatly reduced by using the appropriate inner insert (mandrel) and setting them up properly.

Tubing bending jig chart radius sprinback