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In tension levelling, plant-specific variables such as leveller rolls, roll immersion depth and strip tension have an impact on the levelling result. To eliminate non-flatness in the cold strip, the necessary degree of stretching only slightly exceeds the length differences in the strip. The stretching rate obtainable mainly depends on the deflection force acting on the bending rolls. As the strip tension or the deflection angle increase, this force grows correspondingly. Higher stretching rates result for thinner strips with identical deflection force and under otherwise identical conditions. Specific strip tensions of the same amount cause a slightly higher stretching rate with thicker strips. Higher stretching rates are obtained across the entire range of adjustment for all strip thicknesses and steel grades when using thinner leveller rolls. The maximum possible stretching rate is limited by the leveller roll radius in each case. The type and magnitude of the strip defects after levelling are largely determined by the last bending operation. If a favourable setting is chosen for the adjustment roll, strip bends can be eliminated and flatness deviations can simultaneously be reduced to acceptable values.

Additional information

Authors: THIES H, Betriebsforschungsinstitut des VDEh, Düsseldorf (DE)
Bibliographic Reference: EUR 13348 DE (1991) 112 pp., FS, ECU 10
Availability: (2)
ISBN: ISBN 92-826-2399-8
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