PURPOSE: To make the temperature distribution of a steel plate uniform, by adjusting a gap between a work roll and a draining board in accordance with the rolling conditions such as the king of steel, rolling size, and rolling temperature of a material to be rolled, and regulating the flow rate of cooling water to be supplied to the peripheral surface of the roll.
CONSTITUTION: In a hot rolling mill where a steel plate 20 is hot-rolled by a work roll 2n, a gap between a draining board 8n and the roll 2n is made freely adjustable by a rod 9a of an air cylinder 9. Rolling conditions (l) such as the kind of steel, use, rolling size such as the thickness and width of a slab, unit weight, temperature at the inlet side of a stand, and target temperature of rolling, are previously inputted to a calculator 14. Then, a sequence controller 13 controls a pressure regulating valve 12a through a pressure regulating gauge 15 and a 1/P converter 16a, basing on a cooling pattern commanding signal (h) outputted from the calculator 14, to control the gap between the board 8 and the roll 2n by the cylinder 9. Accordingly, the flow rate of cooling water to be supplied to the peripheral surface of the roll 2n is regulated to make the temperature distribution of the plate 20 uniform.
NISHIMOTO SHIYOUICHI
TAURA TOSHIHARU
| JPS5411141A | 1979-01-27 |
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