Patent ID: 7891405
Filing Date: 2011-02-22
Classification: B22D

Abstract:
1. A water-cooled mold for continuous metal casting, comprising two water-cooled wide copper plates which are arranged opposite to each other in a front-and-back direction and two water-cooled narrow copper plates which are arranged opposite to each other in a right-and-left direction, the two water-cooled narrow copper plates and the two water-cooled wide copper plates each having an inside surface, these inside surfaces altogether defining a cavity of the mold; an upper portion of the cavity of the mold being a sprue area and a lower portion of the cavity being a mold cavity area, the sprue area being gradually narrowed in a casting direction and smoothly transited into the mold cavity area, which corresponds to a shape of a slab to be cast; the inside surface of each of the water-cooled narrow copper plates being a smooth planar surface; a portion of the inside surface of each of the water-cooled wide copper plates that is in the sprue area being a curved surface, and a portion of the inside surface that is in the mold cavity area being a planar surface, the curved surface portion and the planar surface portion forming a continuous smooth surface; and a central point (O 1 ) of a top face of the mold being an intersection point of a central axis of the mold with the top face of the sprue area, wherein the inside surface of a selected one of the water-cooled wide copper plates is formed of such points (P) that they are intersection points of first curves and second curves, the points (P) having three dimensional coordinate values x, y and z in a three dimensional coordinate system with the X axis lying in the planar surface portion of the inside surface of the selected water-cooled wide copper plate and parallel to the top face of the mold, the Y axis parallel to the water-cooled narrow copper plates and the top face of the mold, and the Z axis parallel to the central axis, wherein with respect to the selected water-cooled wide copper plate, the first curves are located in horizontal cross sections at different heights of the central axis of the mold, and are left-right symmetrical about the central axis, a distance from a peak point of every first curve to the central axis in the direction of the Y axis being H+h, and a distance from a valley point of every first curve to the central axis in the direction of the Y axis being h; every first curve is composed of a curve segment in the middle and two linear segments at two opposite ends adjacent to the water-cooled narrow copper plates, each of the two linear segments having a length l wherein with respect to the selected water-cooled wide copper plate, the second curves are located in longitudinal sections parallel to the water-cooled narrow plates, every second curve is composed of an upper inclined linear segment having an upper endpoint and a lower endpoint, with a ratio k of a distance from the lower endpoint to the planar surface portion of the inside surface of the selected water-cooled wide copper plate to a distance from the upper endpoint to said planar surface portion, a middle curve segment with a connection point (m) to the inclined linear segment, and a lower vertical linear segment parallel to the central axis with a length d wherein with respect to the selected water-cooled wide copper plate, the curve segment of every first curves meets the following equation: where n has a minimum value of 6, a wherein with respect to the selected water-cooled wide copper plate, the curve segment of every second curves meets the following equation: where m has a minimum value of 5, b