| 摘要 |
<p>PURPOSE:To economize original unit of electric power considerably and to obtain steel plates of high quality in good yields by forming roll cooling water systems into plural water systems, controlling the same to the pressure conforming to the surface temps. of respective rolls and making combination use of a mist cooler for work rolls. CONSTITUTION:Highly pressurized water is injected from the nozzles 4, 4 of coolers toward the respective front and rear surfaces and rear surfaces of the work rolls 1, 1, and backup rolls 2, 2 of the respective stands of the roughing millIand finishing mill II of continuous hot strip mills. Here, the cooling water systems are made independent with roll 1 groups A, B and roll 2 group C, respectively. The surface temps. of >=1 piece of rolls of the groups A-C are measured by a thermometer 5 and if they are higher than reference upper limit values, an instructing device 6 instructs a water pressure controller 7 to increase the water pressure up to prescribed pressure. Thus the water pressure can be controlled by each group. Further a mist cooler 8 is provided on the inlet side of the work rolls of the finishing stand, whereby the temp. drop of the materials to be rolled is decreased and steel plates of high quality are produced in good yields.</p> |
