Thickness control method in thick plate rolling

摘要

PROBLEM TO BE SOLVED: To provide a plate thickness control method in thick plate rolling, capable of reducing the cutting-off amount of both longitudinal ends of a rolled product by optimizing the lock-on condition of a gauge meter AGC.SOLUTION: The plate thickness control method in thick plate rolling includes sequentially measuring rolling loads P1 and P2 respectively generated on the motor side and the opposite motor side of a rolling machine 1 at a cycle of 10 ms or less from the metal-in time of a plate 10, calculating the sum load P and the difference load ΔP of the measurement values of the motor side and the opposite motor side for each sequential measurement, measuring the passage of time from the metal-in time, detecting last time when one of the event that the sum load P reaches a scheduled load and the event that the passage of time reaches scheduled time, and the event that the difference load ΔP is lower than a preset difference load threshold value both appear, and locking-on a gauge meter AGC according to the detection of the last time.SELECTED DRAWING: Figure 1