| 摘要 |
PURPOSE:To adjust finely the thickness of a light-gauge strip on an outlet side and to eliminate the variance in the strip thickness in the stage of producing the light-gauge strip by down flow of a molten metal between cooling rolls by adjusting the rate of the molten metal to be supplied to stabilize the height of the molten metal surface in the cooling roll gap to an adequate height. CONSTITUTION:The molten metal in a tundish 1 flows down 4 from a nozzle 2 and is quickly cooled in the gap between a pair of water-cooled rolls 3 by which a light-gauge strip 5 is obtd. The thickness D of the strip 5 on the outlet side is maintained constant if a flow-down rate 4 is maintained constant and the height (h) of the molten metal surface between the rolls 3 is stabilized by stabilizing the molten metal head H with respect to the sectional area of the nozzle 2 to an adequate value. More specifically, the rate ui(cm<3>/s) of pouring is expressed by the equation I and the thickness D(cm) is expressed by the equation II where the coefft. of solidification is designated as K. The value of the equation I is the equation III. The quickly cooled light-gauge strip having a uniform thickness is thus obtd. by adjusting the rate ui in a way as to maintain the specified height (h) of the molten metal surface. |
