| 摘要 |
PURPOSE:To make heat extraction uniform and to prevent the nonuniformity in the quality of a steel material in a curved type continuous casting machine by making the radius of arc on the inside wall surface of a casting mold in contact with the top surface side of a billet smaller than the difference between the radius of arc on the inside wall surface of the casting mold in contact with the bottom surface side of the billet and the casting thickness of the billet. CONSTITUTION:The arc AB and arc CD on the inside wall surface of a casting mold are respectively part of the circle having the radius RL of curvature on the top surface side (surface L) and the radius RF of curvature on the bottom surface side (surface F), and is the radius RL of curvature is so set as to be equal to the radius R'L of curvature smaller than the size determined by subtracting the casting thickness of a billet, as designated as (d), from the radius RF of curvature. For example, a fresh center E of curvature is set on the bisector of an angle AOB and the arc of the radius R'L running the point A and the point B is considered, then the restricting amt. between the inside wall of the casting mold is set about r/l=0.3-0.5% where said restricting amt. is designated as (r) and the length of the arc AB having the radius RL shown by the soild line as (l). |
