Method of and apparatus for leveling strip
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United States of America Patent
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Oct 23, 2012
Grant Date -
Nov 19, 2009
app pub date -
May 14, 2009
filing date -
May 16, 2008
priority date (Note) -
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Abstract
A method of leveling metal strip having a thickness ≦1 mm has the steps of passing the strip in a travel direction through an upstream braking-roller set and a downstream tension-roller set and through a group of leveling rollers between the braking-roller set and the tension-roller set. A predetermined tension equal to at least 70% of a yield limit of the strip is applied to the strip between the braking-roller set and the tension-roller set for stretch-bend or tension straightening by differentially driving the upstream and downstream roller sets. The strip is bent between the leveling rollers to correct longitudinal curve. Leveling rollers are used of diameters that increase downstream in the travel direction and that are so great that the strip follows the curvature of the leveling rollers at the predetermined tension.
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