| 摘要 |
<p>PURPOSE:To discover the presence or absence of the error in the measured value of a thickness gage in an early period by providing two range finders so as to face the coiling position of a steel sheet, measuring the distance up to a take-up shaft and the distance up to the coil surface and calculating an average sheet thickness. CONSTITUTION:The steel sheet after cold rolling is measured with the thickness gage 3. The distance la up to the surface of the take-up shaft 5 is measured with one range finder A and the distance lb up to the coil 6 surface is measured with the other range finder B. The number of revolution of the shaft 5 is detected by a revolution detector 7. The respective measured values are fed to an arithmetic unit 8 and the average thickness H is determined by H={(la '-lb')-(la-lb)}/n from the measured values la', lb' after the n-revolutions. On the other hand, the average sheet thickness Hx are compared and judgement is made that the measuring accuracy of the thickness gage 3 is within a control range if the result of the comparison is within the set reference value. The rolling is stopped and the thickness gage 3 is corrected when the value is out of the control range.</p> |
