COLD ROLLING METHOD OF THIN STEEL STRIP

摘要

PURPOSE:To prevent slip between rolls during accelerated and decelerated rolling and to enable the rolling mill to make stationary rolling at a high speed and high draft by controlling the supply rate of a rolling mill lubricant so as to increase or decrease said rate according to the rolling speed. CONSTITUTION:The rolling speed is detected by a tachometer 3 connected to a roll driving motor 2 of a rolling mill 1 of a backup roll driving system. The supply rate of the rolling mill lubricant discharged from a feed pump 5 for the rolling mill lubricant is controlled by a speed control device 4 of the pump 5 and the rolling mill lubricant is injected to the mill 1 and a strip 9 from nozzles 8. The strip is thus rolled without generation of a slip owing to the excessive lubrication during accelerated and decelerated rolling and a heat scratch owing to the deficient lubrication in the stationary rolling stage at a high speed.