| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a control apparatus of a hot rolling mill, which control apparatus can stably continue a rolling work without stopping a rolling line even when a rolling material having a portion cooled to an excessively low temperature is rolled. <P>SOLUTION: The control apparatus of the hot rolling mill comprises a means for maintaining a closing operation of the rolling-reduction position by a rolling-reduction position adjusting device 3A, in which a detected value 7A of a rolling load detected by a rolling load detecting device 7 of the rolling mill is compared with a set value 6A of an allowable load in the rolling mill, and the operation of an automatic plate thickness controlling means 13 is stopped when the detected value of the rolling load has reached to the set value of the allowable load; and a load maintaining control means 11 for controlling the load such that the detected value of the rolling load does not exceed the set value of the allowable load and the load is kept constant by operating the position of rolling-reduction to be released when the detected value of the rolling load has further increased because of the temperature drop of the rolling material, etc. When the low temperature portion of the rolling material has passed the rolling mill and the detected value of the rolling load has returned to the value within the set value of the allowable load, the operation of the position of the rolling-reduction by the automatic plate thickness controlling means is resumed. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
