METHOD FOR ROLLING STEEL TUBE BY ON-LINE MEASURING DISPLACEMENT OF SURFACE OF ROLLING ROLL IN HIGH-SPEED HOT ROLLING PROCESS FOR STEEL TUBE

摘要

PURPOSE:To secure a stable finished outside diameter by measuring slight displacement of the roll surface of the final rolling stand and controlling the finished outside diameter. CONSTITUTION:Displacement sensors 4a, 4b by, for example, eddy current system or the like are provided on the surfaces of the rolls 1a, 1b of the finishing stand, the slight displacement of the roll surfaces is on-line measured and calculated with a controller 5. That is, movement command of roll shafts 2a, 2b is outputted for adjusting the finished outside diameter based on these measured data. In this way, the displacement of the roll surface is quantitatively measured and the amount of roll wear can be recognized.