To bend Aluminium sections, the process is near identical. It has mild steel sections, the difference being that in general, Aluminium extrusions require higher levels of accuracy and control due to the different properties of the metals. When Bending aluminium, it has a tendency to work-harden and crack if the correct methods are not used. Aluminium comes in a number of grades and tempers. The most commonly used aluminium alloy is 6063 T6. 6063 T6 has good formability, weldability and corrosion resistance. 6082 is often used for architectural applications. This grade is highly corrosion resistant and has good formability. At Neville Precision we can offer 3 different methods of section bending.
When rolling a (thin walled) profile in a small radius, there is an increased risk of tearing and straining. In order to prevent this, the profile can be bent by means of mandrel bending.
A special CNC mandrel bending machine is needed for this technique and it requires product specific equipment to limit deformation of the cross section to an absolute minimum.
Stretch bending originated within the aviation industry, but it is now also widely used for architectural, machinery, and automotive applications.
It is a very precise bending method in which the material surface remains in perfect condition and the diameter is distorted minimally. It is ideal, for example, for aluminium façade profiles, tent profiles and aerofoils, where the visual aspect of the application is very important.
A special stretch bending machine is used for this bending process. This firmly clamps the profile at both ends, tensions these and then pulls them back, around a mould.
In contrast to rolling, the profile does not come into contact with the machine.