Abstract:
A composite side dam for a continuous twin roll caster includes a substrate made of a refractory material capable of withstanding casting temperature and having edge portions adapted to engage casting rolls and having a nip portion adjacent a nip between casting rolls and upper portions extending across the side dam to form a lateral restraint for a casting pool, an insert of at least 10 mm in thickness positioned in a pocket in the substrate and extending to engage the molten metal and extending from the upper portions of the substrate and positioned in the pocket to within 30 mm from the nip portion by insertion adjacent the upper portions of the substrate, and the insert adapted to fit into the pocket of the substrate to form a side dam formed of a refractory material having consumption rate less than 10 mm per hour. The material forming the insert may be between 40 and 60% SiAlON material and the remainder hBN material, or mullite material as described by FIG. 11, or between about 60 and 63 mole percent Al2O3 and the remainder SiO2, or fused silica, such as between 40 and 60% fused SiO2 and the remainder hBN material.
Abstract:
A twin roll caster and a method for operating comprising two casting rolls that delimit a casting gap on its longitudinal sides; two side plates that delimit the casting gap on its narrow sides; and at least one axial actuator associated with one of the side plates and impacting the respective side plate on its rear turned away from the front sides of the casting rolls with a force axially aligned toward the casting gap pressing the side plate against the front sides of the casting rolls. An axial actuator acts on the rear side of the side plate by means of a joint provided to adjust an angular offset between the normal level relative to the effective direction of the force applied by the axial actuator to the side plate and the normal level relative to the axes of rotation of the casting rolls.
Abstract:
An apparatus and method for controlling the horizontal oscillation of an edge dam of a twin roll strip caster is provided. The apparatus includes an oscillation unit which horizontally oscillates an oscillation plate in accordance with an oscillation waveform so that an edge dam refractory coupled to the oscillation plate horizontally oscillates, a servo valve which outputs the oscillation waveform to the oscillation unit, and a control unit which applies the oscillation waveform to the servo valve, thus controlling the horizontal oscillation of the oscillation unit. The amplitude, frequency and waveform of the oscillation are variably controlled depending on casting conditions. The edge dam horizontally oscillates, using the servo valve and a hydraulic cylinder, thus rapidly removing edge skull and suppressing the generation and growth of skull, thereby preventing a casting roll or edge dam from being damaged.
Abstract:
Exemplary embodiments of the invention provide a side dam for a continuous metal casting apparatus having elongated opposed casting surfaces forming a casting cavity. The side dam has an elongated upstream part and an elongated downstream part that are mutually laterally pivotable, and a smooth metal-contacting side surface extending continuously from an upstream end to a downstream end of the side dam. The surface has regions thereof formed on the upstream part and the downstream part. Mutual pivoting of the upstream part and the downstream part of the side dam enables the regions of the smooth metal-contacting side surface to be moved out of mutual coplanar alignment. The side dams can therefore be used to form either a convergent or divergent casting cavity to assists the casting procedure and to enhance the properties of the cast article.
Abstract:
Apparatus for continuously casting metal strip includes a pair of counter-rotatable casting rolls laterally positioned to form a nip there between through which thin strip can be cast, a pair of confining side dams adjacent the ends of the casting rolls capable of confining a casting pool of molten metal supported on the casting rolls above the nip, each side dam having a surface capable of contacting the molten metal of the casting pool, with unraised portions and raised portions to form troughs with the unraised portions as base between the raised portion of the side dam and the casting surfaces of the casting rolls to guide the flow of molten metal, and a metal delivery system disposed above the nip and capable of discharging molten metal to form the casting pool supported on the casting rolls.
Abstract:
Intended is to acquire a strip with less thickness even if arcuate wear steps are formed on side weirs.During an operation of a twin-roll casting machine with arcuate wear steps 6 developing on side weirs 2 due to rotational sliding contact of chilled rolls 1, where thickness of a steel strip 3 from a nip G is to be reduced, center-to-center distance L between the rolls 1 is reduced with the side weirs 2 in contact with ends of the rolls being displaced upward. This prevents interference of outer peripheries of the rolls 1 with boundary surfaces 8 adjacent to the arcuate wear steps 6 of the side weirs 2.
Abstract:
A method for operating a two-roll casting machine for casting molten metal into cast strip, which machine has two casting rolls which are each rotatively driven in opposite directions about an axis of rotation and between them delimit a casting gap on its longitudinal sides, with side plates that can be placed on the casting rolls, which side plates seal the casting gap on its narrow sides in the casting operation, bridging the casting gap with a refractory material, wherein the side plates are moved during the casting operation in a direction which is aligned parallel to the direction of conveying in which the cast strip leaves the casting gap. With such a method the formation of grooves distorting the casting result and the casting operation can be suppressed with increased certainty and the service life of the side plates can be increased, compared to the prior art.
Abstract:
A method of producing thin cast strip by continuous casting having a two-piece side dam assembly. The side dam assembly includes a side dam having an upper portion positioned adjacent to a lower portion. The upper and lower side dam portions each have opposite outer surfaces, one surface capable of contacting molten metal and the opposite outer surface having at least one fastening portion capable of attaching the side dam portions to a corresponding side dam holder, in order to hold the side dam portions in place during casting without exposed portions of the side dam holders extending substantially beyond the opposite outer surfaces toward the outer surfaces capable of contacting molten metal, and without the side dam holders preventing the upper side dam portion from being properly positioned adjacent to the lower side dam portion.
Abstract:
The method of producing thin cast strip by continuous casting having a side dam assembly. The side dam assembly includes a side dam having opposite outer surfaces, one surface contacting molten metal and the opposite outer surface having fastening portions capable of attaching the side dam to a side dam holder, to hold the side dam in place during casting without exposed portions of the side dam holder extending substantially, beyond the opposite outer surface toward the outer surface for contacting molten metal.
Abstract:
A method of continuously casting thin strip where, at the start of a casting campaign, the side dams are pressed against the end surfaces of the casting rolls with a pressure of less than 3.0 kg/cm2 but more than 1.25 kg/cm2 and after the target casting pool height is reached, reducing the pressure exerted by the side dams against the end surfaces of the casting rolls to below 1.25 kg/cm=hu 2 =l to reduce wear of the side dams against the end surfaces of the casting rolls.
Abstract translation:一种连续铸造薄带的方法,其中在浇铸活动开始时,侧坝以低于3.0kg / cm 2的压力挤压在铸辊的端面上,但更多 在1.25kg / cm 2以上,并且在达到目标浇注池高度之后,将侧坝施加在铸辊端面上的压力降低到低于1.25kg / cm 2 = 2 以减少侧坝抵靠铸辊端面的磨损。