In the production of rolled steel sheet the cold roll mill imparts the final thickness, surface finish and mechanical properties to the product by passing it through a series of highly loaded rollers (roll stands). At the exit to the cold mill the steel sheet is rolled into a coil on a cantilevered take up roll assembly called the tension reel. As the name implies the tension reel is designed to maintain the sheet under the correct tension as it is being rolled. Tension that is too low or too high can cause surface defects on the steel. A major U.S. steel manufacturer was experiencing large sheet tension variations at the tension reel and high tension reel vibration which was cracking support steel. SDL worked with the steel producer to develop a computer model of the tension reel dynamics to understand the problem. The computer model accurately matched measured data and revealed a surprising cause of the tension variation and vibration.
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