Metal founding – Means to shape metallic material – Continuous or semicontinuous casting
Patent
1992-09-11
1994-04-19
Lin, Kuang Y.
Metal founding
Means to shape metallic material
Continuous or semicontinuous casting
164480, B22D 1106
Patent
active
053037650
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a roll casting machine which comprises essentially a pair of cooled rotatable rolls and a nozzle assembly having its outlet end projecting into the gap between the rolls whereby, in use, molten metal is directed from the outlet end of the nozzle into the gap to be cooled by the rolls and to be shaped into the form of strip.
Such casting machines are well known and the nozzle is positioned with its outlet end projecting into the gap close to the position of minimum separation between the rolls.
According to the present invention, a roll caster comprises a pair of rotatable rolls; means for moving one of the rolls towards and away from the other roll to adjust the gap therebetween; a nozzle assembly having an outlet end projecting into the gap with clearance between the outlet end of the nozzle and the rolls; and means for causing the nozzle to be moved into and out of the gap to maintain clearance between the nozzle and the rolls as the gap is adjusted.
Conveniently, the nozzle assembly is mounted on a carrier which is pivotally located on pairs of links and the carrier is caused to pivot on said links to direct the nozzle assembly towards and away from the rolls. The carrier is pivoted by means dependent upon the separation of the rolls.
In one embodiment of the invention, physically displacing the movable roll is used to mechanically displace the carrier whilst, in another embodiment of the invention, a signal dependent upon the separation of the rolls is employed to control an actuator such as a hydraulic piston-cylinder device or a stepper motor which causes the carrier to pivot.
BRIEF DESCRIPTION OF THE DRAWINGS
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:
FIG. 1 shows diagrammatically a first embodiment of the invention;
FIG. 2 shows the embodiment of FIG. 1 in more detail;
FIG. 3 is a view on the line III--III of FIG. 2; and
FIG. 4 is a side elevation, partly in section, showing an alternative embodiment of the invention.
DETAILED DESCRIPTION OF THE DRAWINGS
A pair of rolls 1, 2 are arranged one above the other with their longitudinal axes of rotation horizontal. The lower roll 2 is mounted at its ends in bearing clock assemblies 3 which are secured in a housing structure, indicated generally by reference 4 in FIG. 2. The upper roll 1 is similarly mounted at its ends in bearing chock assemblies 5 which are also supported in the housing structure 4. However, the chocks 5 and, hence, the roll 1 are displaceable within the housing structure in order to adjust the gap 6 between the rolls. Means (not shown) are provided for adjusting the top roll with respect to the lower roll and a position transducer 7, shown in FIG. 2, is arranged between the chocks in order to indicate the size of the gap between the rolls.
A nozzle assembly 9 is arranged with its longitudinal axis substantially horizontal and its outlet end 10 projects as far into the gap as is possible whilst maintaining clearance between the outlet end of the nozzle and the rolls.
In use, molten metal is passed from a tundish, indicated generally by reference 12, into the nozzle and is directed from the outlet end of the nozzle into the gap between the rolls. The rolls are cooled by means (not shown) so that, as the molten metal comes into contact with the periphery of the rolls, it is cooled to form a flat strip.
The nozzle assembly and the tundish are mounted on a support carrier 13. The carrier comprises a plate 14 which extends between a pair of side walls 15 which together constitute a channel-shaped carrier for supporting the nozzle assembly. Each of the side walls 15 is pivoted at its forward and rear ends to forward and rear links 16, 17, respectively. The lower ends of these links are, in turn, pivotally secured to fixed blocks 18 mounted on a support bracket 19 projecting from the housing structure 4. The links 16, 17 are such that the carrier 13 is pivoted towards or away from the rolls 1
REFERENCES:
patent: 4577672 (1986-03-01), Frischknecht et al.
Hunt John D.
Pearson William J.
Davy McKee (Poole) Limited
Lin Kuang Y.
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