More than ever convinced even rolled diagnostic device for determining

摘要

PURPOSE: An apparatus for judging confidence rate of abnormality diagnosis in hot finishing mill is provided to judge causes of quality defects more promptly and accurately by operating confidence rate for a thickness defect diagnosing method in the finishing mill. CONSTITUTION: The apparatus comprises an SCC (supervisory control computer) setting part(210) for determining target setting values including target thickness, target load, roll speed and roll gap; a thickness deviation excess judging part(213) for judging whether a thickness deviation between a target value set in the SCC setting part and actually measured values is greater than allowable tolerance or not; a correlation operating part(214) for operating correlation (C1) between operator intervention amount and tension change, correlation (C2) between the thickness deviation and tension change and correlation (C3) between the operator intervention amount and the thickness deviation if the thickness deviation is greater than allowable tolerance of consumer; a correlation polarity judging part(217) for judging polarity of correlation between the C1, C2 and C3; and a confidence rate operating part(218) for determining that confidence rate is zero if any one of the operated three correlation polarities has a negative sign, and deciding a final roll speed operating intervention confidence rate as an average of the three correlations if all of the operated three correlation polarities have positive signs.