PURPOSE: To produce a long-sized thin alloy sheet having good accuracy in thickness by measuring the thickness of a thin alloy sheet formed from a molten alloy on a cooling cylindrical body which revolves at a high speed, and controlling the thickness according to the measured values thereof.
CONSTITUTION: The molten alloy 2 ejecting through a nozzle 1 is quickly cooled and solidified to a thin sheet by contacting the surface of a rotating body 3 which has a force cooling function and moves at a high speed, whereby a thin alloy sheet 4 is obtained. Gap sensors 5, 6 are provided near the surface of the body 3 just before the part where the alloy 2 is ejected through the nozzle 1 and near the surface of the body 3 where the alloy is cooled and solidified to a thin sheet. From the difference in the clearances in both places detected by the sensors respectively, the thickness of the sheet 4 is measured with good accuracy. According to the rate of deviation between the measured value and set value of the thickness, the clearance between the ejection port of the alloy 2 and the surface of the body 3 or the pressure of ejection is controlled, whereby the thickness is controlled.
ARAKAWA SHIYUNSUKE
SAWADA RIYOUZOU
