| 摘要 |
PURPOSE:To improve the product yield by installing a highly pressurized water injection nozzle of a descaling header toward a rolling mill side and injecting the highly pressurized water only for a time from the top end of a rolled stock passes through the nozzle position to the rear end of the stock passes through the mill. CONSTITUTION:Injection nozzles 9 of descaling heads 5, 6 installed in positions in the front and rear of a rolling mill and above and below a stock 1 to be rolled are installed toward work rolls 2, 3. A position of the top end of the stock 1 is detected by the number of rotations of the rolls 2, 3 through a pulse generator. Injection of highly pressurized water is started at just before the top end passes through a position right under the nozzles 9 and is stopped at the same time when the rear end of the stock 1 passes through the rolls 2, 3. The highly pressurized water is blocked by the rolls 2, 3 and the stock 1 and flows in the lateral direction. The end part quality of products and the product yield are improved because supercooling of the top and rear ends of the stock 1 is prevented.
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