STRAIGHTENING TECHNOLOGIES

Straightening process

Sheet metal plates with thicknesses ranging from over 50 mm to sheet metal strips in the form of extremely thin foils are straightened prior to further processing. The material undergoes a multiple back-and-forth bending process with a steadily decreasing curvature between the straightening rolls.
The number of straightening rolls used depends on the desired straightening result. Straightening sheet metal that has unevenness in both the rolling and transverse directions is particularly challenging. In such cases, the straightening process may need to be repeated several times to completely eliminate the multi-axis stress states in the material.
The best results are achieved with precision straightening machines, which are designed to be extremely low-stretch and equipped with roll deflection compensation.
LORENZ straightening machines are characterized by particularly high bending and tensile stiffness – for maximum precision and process reliability.

Roller deflection

This is the most complex type of straightening. Strips that are not the same thickness across the entire width and different lengths therefore have a transverse curvature. A distinction is made here between edge waves and centre buckles. To correct these defects, a straightening machine with roll deflection is required, which allows the individual back-up roller blocks to be fed.