JPS5550917A - Controlling method of take-up tension of serrated coil - Google Patents

Abstract

PURPOSE: To prevent occurrence of stick and slip by so controlling the take-up tension after the plate thickness change point that the tension integrated value after the plate thickness changing becomes the tension integrated value of the specified tension of the outside wond coil at the time of taking-up the steel plates of different wall thickness to serrated coils.

CONSTITUTION: When an inside wound coil is thicker than an outside wound coil, the inside wound coil is begun to be wound under the initial tension I determined by the specified tension curve 22 and is taken up under the tension gradually decreasing down to the plate thickness change point A. From the plate thickness change point A, an outside wound coil is taken up and this taking up is accomplished in accordance with the take-up tension curve 26. The taking-up ends at the final tension E. The integrated value of the take-up tension curve 26 and outside diameters is so determined as to become equal to the tension integrated value of the specified tension curve 24 of the coil for outside winding. In this way, the take-up tension from the plate thickness change point gradually decreases and unlike in conventional methods, taking up of the outside wound coil under abruptly decreasing take-up tension is obviated and therefore the slip which had hitherto occured at the rewinding in skin-pass rolling mills may be prevented.

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