JPS5485164A - Rolling method and roll-speed-controller for dual-speed- rolling-mill - Google Patents

Abstract

PURPOSE: To prevent the surface of the roll from the flaw, to prevent the accident due to the overload of the driver system, to smooth the rolling work, to reduce the rolling load, and to manufacture the good rolled product, by changing the circumferential speeds of the upper and lower work rolls correspondingly to the rolling condition.

CONSTITUTION: When the sheet 10 is bitten tinto the gap between the upper and lower work rolls 1 and 2, the metal-in-signal-generator 19 inputs the metal-in signal to the arithmetic unit 9 depending on the signal from the load cell 8. The arithmetic unit 9 operates the optimum dual speeds depending on the rolling condition like as the sheet gauge, the draft percentage, the roll- diameter, the tension, etc., and the controller 11 settles the speed of motors 6 and 7 accordingly to the result of this operation, and then, the rolling work is carried out. When the sheet is bitten into the gap of upper and lower work rolls 21 and 22, a signal is inputted from the signal generator 20 into the arithmetic unit 9 which operates the optimum dual speeds correspondingly to the change in the rolling condition, and the controller 11 controls the speeds; and after the sheet-pass-work is finished, the acceleration, the normal rolling speed, and the deceleration, and successively performed for finishing the rolling work.

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