| 摘要 |
<p>PURPOSE:To improve the product yield by controlling a coolant flow rate to be constant for a prescribed duration before and after the top of a rolled stock reaches a cooling zone and controlling a coolant flow rate based on a stock temp. in the inlet side of the cooling zone after the above duration. CONSTITUTION:An inlet side steel stock temp. TA is real time measured from the time when a carried inlet side steel stock 10A reaches an inlet side steel stock thermometer 14A and the measured value is sent to a controller 16. Then, a coolant flow rate is controlled to be constant for a prescribed duration by a control valve 26 through an amplifier 22 and a unit 24. The flow rate through the valve 26 is subjected to a feedforward control by a feedforward arithmetic function 18 after the duration. In that method, the temp. throughout the entire length of the stock including the top part is equalized, so that the dimensional accuracy of products is improved and variations in scale are reduced to improve the product yield.</p> |
