| 摘要 |
<p>PURPOSE:To accurately cooling and controlling a steel material at a prescribed position or at a prescribed time by estimating a temp. considering the situation of progressing transformation of the cooling steel material and by determining the quantity of cooling water based on the estimated temp. CONSTITUTION:The hot rolled steel strip S got out of a finish rolling mill 1 is cooled by a cooling installation R consisting of cooling banks 1-N equipped with water cooling equipments 3 and air cooling equipments 4, to make to a prescribed temp. and to wind in a winder 6. At that time, through outlet side speed detecting sections 10, 12, inlet and outlet sides thermometers 2, 5, the plate speed, plate temp. of the steel strip S are detected respectively to input an outlet pattern deciding section 14 of the cooling bank. In this case, by considering said detected values, set values of the target temp. of the steel strip S, the plate thickness, etc., and the variation of the calorific value corresponding to the time variation of the transformation ratio of the steel strip S, each cooling bank pattern is decided. Then, based on this pattern, the quantity of cooling water of each bank 1-N is controlled to perform the cooling control of the steel material S.</p> |
