Patent ID: 8167024

Claim:
A method for bringing about axial electromagnetic rotation of molten metal in an ingot mold for continuous casting of slabs, the mold provided with an immersed casting spout having lateral outlet louvers open toward small end faces of the ingot mold, the method comprising: identifying a natural flow mode of the molten metal as one of single loop, double loop, and unstable mode; mounting at least four separate polyphase inductors with magnetic fields sliding along the width of the ingot mold on large faces of the ingot mold in a proportion of two inductors per large face; controlling the inductors to create a system of four driving forces, whose two forces associated with a pair of inductors situated diagonally relative to a casting axis push the metal from the nozzle toward the small faces and therefore toward the exterior, while the other two forces, themselves associated with the other pair of diagonally disposed inductors, push the metal from the small faces toward a nozzle and therefore toward the interior; imposing an axial rotational motion of the molten metal at a meniscus with the forces; intensifying the forces pushing the metal toward the interior more greatly if the natural flow mode is the single loop mode, intensifying the forces pushing the metal toward the exterior more greatly if the natural flow mode of the metal is the double loop mode, and controlling the forces to be a same intensity if the natural flow mode is the unstable flow mode; and homogenizing rotational motion of the molten metal at the meniscus in a course of casting.