PLATE WIDTH CONTROLLING METHOD OF STRIP DURING HOT FINISH ROLLING

摘要

PURPOSE:To reduce the plate width variation of a strip by controlling at least one of the divergence of a vertical roll and the tension to be given to a strip based on the plate width variation of the strip at the inside of a vertical roll. CONSTITUTION:A vertical rolling mill 4 having plural vertical rolls 3 is arranged between hot horizontal rolling mills 2b1, 2b2. The divergence of the vertical roll 3 is adjusted in a body by a divergence adjusting device 5 and a pressure detector 6 is provided for detecting the rolling reduction force of the vertical roll 3' of the downmost stream. The tension detector 8 of the strip 7 is provided between the horizontal rolling mill 2b2 of the downstream side and the vertical roll 4. The target plate with of the strip 7 of the outside of the horizontal rolling mill 2b2 of the downstream side is set up and the strip plate width Win of the inside of the vertical rolling mill 4 is measured, and based on the variation value thereof at least one of the divergence of the vertical roll 3 and strip tension is adjusted. With this method the variation in the plate width of the strip 7 is reduced.