| 摘要 |
<p>PURPOSE:To equalize a temperature of a rolling stock in the longitudinal direction and to obtain a hot rolled steel plate with a constant shape by obtaining variations in temperature of the rolling stock at every stand based on a drafting position. A drafting load, and a plate thickness on the inlet side of every hot rolling stand and controlling a cooling water quantity between every stand. CONSTITUTION:A variation DELTAS of drafting values and a variation DELTAP of drafting loads of every stand 12 are obtained based on a value S by a drafting position detector 22, a value P by a drafting load detector 20, and a value (t) by an inlet side plate thickness gage 28 of every hot rolling stand 12. A temperature variation DELTAT is obtained by multifying the DELTAS and DELTAP by temperature variation coefficients (deltaT/deltaS) and (deltaTdeltaP) respectively and using equation I. A necessary water quantity Q which equalize a temperature of a hot strip 14 is obtained by equation II based on the temperature variation DELTAT between every stand 12, plate thickness (t), and plate width (w) and the strip 14 is cooled 16 with the water Q. The temperature of the strip 14 in the longitudinal direction is equalized to make the strip 14 a constant shape hot rolled steel plate.</p> |
