Continuous casting mould

Details Continuous casting mould Continuous casting mould

1991-01-29

1993-02-23

Lin, Kuang Y.

Metal founding

Means to shape metallic material

Continuous or semicontinuous casting

164459, B22D 1104

Patent

active

051881675

DESCRIPTION:

BRIEF SUMMARY
This invention relates to continuous casting of metal and, in particular, to a continuous casting mould for casting workpieces in the form of thin slabs.
EP-A-0149734 and U.S. Pat. No. 4,721,151 both disclose a continuous casting mould of the type to which the present invention relates. Both publications disclose a continuous casting mould having a cavity extending from the inlet end to the outlet end of the mould and the cavity has a cross-section, normal to the lengthwise direction, comprising two side regions of generally rectangular form spaced apart by a central region. In the lengthwise direction of the cavity from the inlet end thereof, the central region is enlarged to form a pouring region into which, in use, the feed tube extends.
In the European publication, the width of the central region between the two side regions is not constant and the pouring region reduces considerably in width along its length.
With such a mould, tensile strains are applied to the solid/liquid interface of the inside of the metal shell as it passes down through the mould. These tensile strains can be detrimental when their magnitude is large enough to open the grain boundaries which allows interdendritic penetration by the liquid solute which can cause detrimental segregation. These strains may also create internal cracks.
In the U.S. publication, the width of the central region between the two side regions is generally constant and the pouring region is of the same width along its length. However, the opposite walls of the pouring region which separate the side regions are constituted either entirely or partially of straight flat walls. It has been found that the use of flat walls reduces the area over which strand deformation occurs and increases the possibility of tensile stress occurring in the strand or increases the degree of compression required to cancel the tensile stress.
According to the present invention there is provided a continuous casting mould having a cavity extending in a lengthwise direction from the inlet end to the outlet end of the mould and which cavity has a cross-section, normal to the lengthwise direction, comprising two side regions of generally rectangular form spaced apart by a central region of generally constant width which does not reduce and in the lengthwise direction of the cavity from the inlet end thereof the central region is enlarged to form a pouring region; characterised in that the opposite walls of the pouring region which separate the side regions are entirely of arcuate form and over at least part of the lengthwise direction of the pouring region the radii of curvature of the arcuate walls progressively increase.
A containment zone may be positioned beneath the casting mould and the pouring region may extend into the containment zone.
In order that the invention may be more readily understood, it will now be described, by way of example only, with reference to the accompanying drawings, in which:
FIGS. 1 and 2 are diagrammatic front and sectional side elevations, respectively, of a continuous casting mould in accordance with one embodiment of the invention;
FIGS. 1A through 1D comprise, respectively, cross sectional illustrations taken along lines 1A--1A through 1D--1D, respectively, of FIG. 1;
FIGS. 3 and 4 are diagrammatic front and sectional side elevations, respectively, of a continuous casting mould in accordance with a second embodiment of the invention;
FIGS. 3A through 3D comprise, respectively, cross sectional illustrations taken along lines 3A--3A through 3D--3D, respectively of FIG. 3; and
FIG. 5 is a diagrammatic sectional side elevation of a continuous casting mould in accordance with a third embodiment of the invention.
Referring now to the figures, a continuous casting mould for casting thin metal slabs, or thick strip, is indicated by reference numeral 1. The mould is conveniently of copper alloy and it is cooled in a conventional manner by means (not shown).
In each embodiment, a mould cavity 2 extends from the inlet to the outlet end of the mould. There may

REFERENCES:
patent: 4635702 (1987-01-01), Kolakowski et al.
patent: 4774995 (1988-10-01), Fastert
patent: 4926930 (1990-05-01), Gay et al.

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