ROLL DIAGNOSTIC METHOD

PROBLEM TO BE SOLVED: To predict the time when a roll is broken due to a bearing of the roll in a continuous casting apparatus. SOLUTION: A roll gap measurement device installed on a dummy bar 1 passing through a cast piece passage of the continuous casting apparatus previously measures the gap between oppositely provided rolls 4 and 5 at a plurality of times with time interval. The time-series tendency of the difference between the measured result and a reference value is checked, and the time period when the difference becomes not less than a predetermined value is estimated based on the time-series tendency of last time, and the time period is determined to be the time of breakage of the roll. Thus, the rolls can each be replaced before breakage of a bearing. COPYRIGHT: (C)2010,JPO&INPIT