Cutting to length
Working principle:
When leveling strip in cut-to-length lines, the forces required to push the strip forward are usually almost exclusively generated by the leveler. This holds the risk of roller slippage which may result in longitudinal scratches on the strip surface. What is more, the drives of leveling rollers are often not powerful enough to handle strip of thicker gages or universal shafts may break due to local overloading.
One Umlauf Bridle
When one Umlauf Bridle is arranged behind the leveler, the strip is pulled through the leveler in a controlled manner, relieving the drives of the leveling rollers. The effect of the Umlauf Bridle may even be so high that some of the leveling rollers can be dispensed with or regular drives can be replaced by auxiliary ones. Under certain conditions, it may even be possible to do entirely without driven rollers.
Two Umlauf Bridles
With one Umlauf Bridle arranged before and one behind the leveler, it is possible to apply - in a precisely controlled manner - a longitudinally acting force of several thousand kN on the strip. It may also be possible to use larger rollers in the leveler, resulting in a marked reduction of residual stresses which improves the overall flatness of the strip.
Benefits:
- Umlauf Bridles can be pivoted through their vertical axis, for example, in order to reduce strip camber and adjust the strip position during side trimming.
- At cut-to-length lines, they position the strip edge perfectly perpendicular to the shear. The result is an exact, rectangular cut.