JP2021062411A - Method and device for continuously casting thin strip with roll crown control - Google Patents

Abstract

To directly and closely control a crown shape of a casting roll casting surface during casting and a cross sectional thickness profile of a thin cast strip produced by a twin roll caster.SOLUTION: An apparatus including at least two expansion rings 210 positioned within and adjacent to a cylindrical tube 120 and spaced within 450 mm in ward from edge portions of a cast strip formed on opposite end portions of casting rolls 12 during a casting process. Each expansion ring 210 includes at least one heating element 370 and an insulating coating 350, is configured to: change a roll crown of a casting surface of the casting rolls and a thickness profile of the cast strip during casting by causing expansion of the cylindrical tube 120 by increasing radial dimension; minimize heat transfer from the expansion ring 210 during casting to the casting rolls 12 by the thermal insulation coating 350; and adjust the expansion of the expansion ring and thus the cylindrical tube by providing a water channel through which water can flow in each expansion ring 210.SELECTED DRAWING: Figure 8

Description

This application is an international application of US Patent Application No. 14 / 946,872 filed on November 20, 2015.

The present invention relates to metal strip casting by continuous casting with a twin roll casting machine.

In a twin roll casting machine, the molten metal is introduced between a pair of horizontal casting rolls that are cooled and rotated in opposite directions, so that the metal shell solidifies on the surface of the moving casting roll and the roll gap between the casting rolls. Produces a solidified strip product that is combined at and fed downward through the roll gap. In the present specification, the term "roll gap" is used to refer to the entire region where the cast rolls are closest to each other. The molten metal is poured from a ladle into one or a series of small containers, from which it flows through a metal supply nozzle located above the roll gap, and is a casting that extends just above the roll gap along the roll gap length direction. It is possible to form a casting reservoir of molten metal supported on the roll casting surface. The casting reservoir is usually defined by a side plate or a side weir that is held by sliding engagement with the end face of the casting roll so as to block the overflow from both ends of the casting reservoir.

The twin roll casting machine can continuously produce casting strips from molten steel via a series of ladle placed on the turret. The molten metal is poured from each ladle into the tandeish, then into the movable tandeish and then flows through the metal supply nozzle into the casting reservoir. Tandish makes it possible to replace a full ladle on a turret with an empty ladle without interrupting the production of cast strips.

In thin strip casting with a twin roll casting machine, a casting roll, generally made of copper or a copper alloy and usually coated with chromium or nickel, is internally cooled with cooling water, resulting in a high thermal flux of the strip during casting and thus rapid solidification. In that case, the casting roll suffers considerable thermal deformation due to exposure to the molten metal. Casting roll The crown on the casting surface changes during the casting operation. Casting Roll The crown on the casting surface determines the strip thickness profile, i.e., cross-sectional shape of thin cast strips made in a twin roll casting machine. A casting roll with a convex (ie, positive crown) casting surface produces a casting strip with a negative (ie, centered) cross-sectional shape. Conversely, a casting roll with a concave (ie, negative crown) casting surface produces a casting strip with a positive (ie, centered) cross-section. As such, the roll crown on the cast roll cast surface is used to produce the desired strip cross-sectional thickness profile under normal casting conditions.

In thin strip casting, the casting roll is usually cold machine finished with an initial crown based on the predicted crown of the casting roll casting surface during casting. However, it is difficult to predict the difference in the surface shape of the cast roll cast in the cold state and the cast state. Furthermore, the crown on the casting roll casting surface can change significantly during the casting operation. The crown of the casting roll casting surface can change due to other casting conditions such as temperature changes of the molten metal supplied to the casting reservoir of the casting machine during casting, changes in the casting roll casting rate, and slight changes in the molten steel composition.

Conventional proposals for casting roll crown control include, for example, a mechanical device that physically deforms a casting roll by moving an element such as a deforming piston in the casting roll or by applying a bending force to the casting roll support shaft. I've been dependent. However, these conventional casting roll crown control proposals have limitations. For example, Japanese Patent No. 2544459 (hereinafter referred to as Patent Document 1) uses a casting roll having an internal "water-cooled roll heating means embedded in two ends", and deforms at each roll end during casting. It discloses that it controls. See the column "Means for Solving Problems" in Patent Document 1. The casting roll is a solid metal roll with an internal cooling path and requires a water heating means at the end of the casting roll. The limits of the casting machine disclosed in Patent Document 1 are discussed in US Pat. No. 5,560,421 (hereinafter referred to as Patent Document 2), and "because the heat capacity of each drum 01 to be heated is large, it is controlled. The deformation response of the desired drum outer surface shape is slow, and it will be difficult or impossible to control the workpiece in a timely manner. " Patent Document 2, column 1, line 64 to column 2, line 1. Patent Document 2 further explains that "it will be impossible to properly control the shape of the workpiece to be continuously cast". The same document, column 2, lines 6-7. Patent Document 2 proposes a solution in which a solid casting roll has an end notch with a large outer annular element that is heated with hot water (relative to the solid roll). These annular elements are used to change the profile of the casting roll. Patent Documents 2, 2 columns, lines 37-42.

Japanese Patent No. 2544459 U.S. Pat. No. 5,560,421

However, large solid casting rolls as proposed in Patent Documents 1 and 2 are expensive to manufacture and have a long life (due to the thermal fatigue effect of the periodic heat flux experienced by large cylinders during double roll casting). It is relatively short and has a large heat mass, so it is not very responsive.

For example, a casting roll by placing an expansion ring directly on a cylindrical tube that is 80 mm thick, made of copper and a copper alloy, optionally coated with chrome or a chrome alloy, and has multiple longitudinal water channels inside. It has also been proposed to form. This proposal has been tried, but has failed. Since the heat provided to the expansion ring is transferred to the cylindrical tube, the ring is effective against heat so that the cylindrical tube can be expanded to commercially control the crown shape of the casting roll casting surface. It didn't respond. Therefore, there is still a need for reliable and effective measures to directly and closely control the crown shape of the casting roll casting surface during casting and thus the cross-sectional thickness profile of the thin casting strips made by the twin roll casting machine. ing.

Disclosed is reliability, which controls the casting roll crown by controlling the crown on the casting surface of the casting roll with an expansion ring located adjacently within the cylindrical tube forming the casting roll, and thus the cross-sectional strip thickness profile. And is an effective method. What is disclosed
a. It has a pair of casting rolls that rotate in opposite directions so that the casting strip can be fed downward from the roll gap with a roll gap in between, and the casting surface of each casting roll is 80 mm or less in thickness and is made of copper and a copper alloy. Assemble a casting machine, made of a material selected from the group and formed by a cylindrical tube with multiple longitudinal water channels extending inside.
b. At least two expansion rings are placed adjacent to each other in a cylindrical tube within 450 mm inward from the edge of the casting strip formed at the opposite end of the casting roll during the casting operation, with each expansion ring having at least one heating. Casting with elements and insulation coating, configured to change the roll crown and casting strip thickness profile of the casting roll casting surface during casting by causing expansion of the cylindrical tube by increasing radial dimensions, casting with insulation coating It is configured to minimize heat transfer from the expansion ring inside to the casting roll and to regulate the expansion of the expansion ring and thus the cylindrical tube by providing a water channel in each expansion ring through which water can flow.
c. Assemble a metal supply system capable of forming a casting reservoir supported on the casting roll casting surface above the roll gap by a side weir that defines the casting reservoir adjacent to the edge of the roll gap.
d. A roll crown configured by controlling the roll crown of a cast roll casting surface during a casting operation by controlling the radial dimensions of the expansion ring in response to at least one of the digital or analog signals received from at least one sensor. This is a controlled thin strip continuous casting method.

The amount of power applied to the expansion ring can be changed based on feedback from the at least one sensor, which can detect at least one of the following characteristics:
Expansion ring temperature,
Downstream casting strip thickness profile,
Local thickness of the casting strip at a specified point near the edge of the casting strip,
Radial casting roll expansion at a defined point near the casting roll surface crown during casting and the casting strip edge,
And it can emit a digital or analog (usually electrical) signal indicating at least one of the above characteristics of the cast strip.

Care should be taken to ensure that the insulation coating on each expansion ring is sufficiently thick to control or eliminate heat transfer from the expansion ring to the casting roll. An insulating coating with a thickness of at least 0.010 inches (eg 0.025 inches) is required for effective control of heat transfer from the expansion ring to the casting roll. The adiabatic coating may be plasma injection into the expansion ring. The adiabatic coating may be plasma injection with zirconia injection such as zirconia injection stabilized at 8% yttria. Although the insulation coating can be applied to the cylindrical tube, the insulation coating should be applied directly to the expansion ring for economic and effectiveness reasons.

Each expansion ring can have at least one heating element, which heating element can be made of stainless steel, nickel or nickel alloy and can be placed in a desired position within each expansion ring. Each expansion ring can provide a heat input of up to 30 kW, preferably at least 3 kW.

Further, by adjusting the water flowing through the expansion ring, the radial dimension of the expansion ring can be expanded or contracted, and the diameter of the cylindrical tube can be increased or decreased as desired to control the shape of the cast surface crown during the work.

Furthermore, the roll crown controlled thin strip continuous casting method controls the casting roll drive to change the casting roll rotation speed in response to at least one of the digital or analog signals received from the at least one sensor. It may be further configured by controlling the roll crown of the casting roll casting surface during the casting operation by changing the radial dimension of the expansion ring.

In addition, the roll crown controlled thin strip continuous casting method each has at least one heating element, is heat-insulated, and causes expansion and contraction of the cylindrical tube by increasing or decreasing the radial dimensions, casting during casting. Corresponding to the center of the casting strip formed on the casting roll during casting at least one expansion ring (eg up to 15 expansion rings), which is configured to change the crown and casting strip thickness profile of the roll casting surface. It may be further configured from the arrangement. Furthermore, the thin strip continuous casting method with roll crown control controls the casting roll drive device to change the casting roll rotation speed, while providing an expansion ring with a heat insulating coating and separated from the casting strip edge, and a heat insulating coating. The radial dimension of the expansion ring corresponding to the center of the casting strip may be modified in response to an electrical signal received from the sensor to control the roll crown of the casting roll casting surface during the casting operation.

Alternatively, the thin strip continuous casting method by roll crown control is
a. It has a pair of casting rolls that rotate in opposite directions so that the casting strip can be fed downward from the roll gap with a roll gap in between, and the casting surface of each casting roll is 80 mm or less in thickness and is made of copper and a copper alloy. Assemble a casting machine, made of a material selected from the group and formed by a cylindrical tube with multiple longitudinal water channels extending inside.
b. At least one expansion ring is placed in the cylindrical tube corresponding to the center of the casting strip formed in contact with the casting roll during the casting operation, and each expansion ring has at least one heating element and insulation coating. The heat insulation from the expansion ring during casting to the casting roll is configured to change the crown and casting strip thickness profile of the casting surface during casting by causing expansion of the cylindrical tube by increasing the radial dimension. It is configured so that the expansion of the expansion ring and thus the cylindrical tube can be adjusted by providing a channel in each expansion ring that minimizes transmission and allows water to flow.
c. Assemble a metal supply system capable of forming a casting reservoir supported on the casting roll casting surface above the roll gap by a side weir that defines the casting reservoir adjacent to the edge of the roll gap.
d. The roll crown of the casting roll casting surface during the casting operation by controlling the radial dimension of at least one expansion ring with the insulation coating in response to at least one of the digital or analog signals received from at least one sensor. It may be configured by controlling.

The value of power applied to the expansion ring can be changed based on feedback from the at least one sensor, which can detect at least one of the following characteristics:
Expansion ring temperature,
Downstream casting strip thickness profile,
Local thickness of the casting strip at a specified point near the center of the casting strip,
Radial casting roll expansion at a defined point near the casting roll surface crown and the center of the casting strip during the casting operation,
And it can emit a digital or analog (usually electrical) signal indicating at least one of the above characteristics of the cast strip.

Again, the insulation coating on each expansion ring should be thick enough to effectively control the heat transfer from the expansion ring to the casting roll. Effective control of heat transfer from the expansion ring to the casting roll requires a thermal insulation coating with a thickness of at least 0.010 inches (eg 0.025 inches). The insulation coating may be plasma injection into the expansion ring. The adiabatic coating may be plasma injection with zirconia injection such as zirconia injection stabilized at 8% yttria. Although the insulation coating can be applied to the cylindrical tube, the insulation coating should be applied directly to the expansion ring for economic and effectiveness reasons.

Again, each expansion ring may have at least one heating element, which heating element may be made of stainless steel, nickel or nickel alloy and may be optionally located anywhere near each expansion ring. Each expansion ring can provide a heat input of up to 30 kW, preferably at least 3 kW.

Here, too, the radial dimension of the expansion ring can be expanded or contracted by adjusting the flow of water, and the diameter of the cylindrical tube can be increased or decreased as desired to control the shape of the casting roll during work.

Furthermore, the roll crown controlled thin strip continuous casting method controls the casting roll drive to change the rotational speed of the casting roll while dimensioning the radial dimension of the expansion ring into an electrical signal received from the at least one sensor. It may be further configured by changing accordingly to control the casting surface roll crown of the casting roll during the casting operation.

In addition, alternative roll crown controlled thin strip continuous casting methods each have at least one heating element and are insulated coated to increase radial dimensions and cause expansion of the cylindrical tube for casting. At least two expansion rings configured to change the roll crown and casting strip thickness profile of the casting roll casting surface inside from the casting strip edge formed at the opposite end of the casting roll during the casting operation. It may be further configured by arranging adjacently in a cylindrical tube with a distance of 450 mm or less. Furthermore, the roll crown controlled thin strip continuous casting method controls the casting roll drive to change the speed of rotation of the casting roll while providing a heat insulating coating and the radial dimension of the expansion ring corresponding to the center of the casting strip. , And the roll crown of the casting roll casting surface during the casting operation by changing the radial dimension of the expansion ring, which is insulated and separated from the edge of the casting strip, according to the electrical signal received from at least one of the sensors. May include controlling.

In each embodiment, the expansion ring may be made of austenitic stainless steel such as 18/8 austenitic stainless steel. Each expansion ring may have an annular dimension of 50-150 mm, preferably 70 mm. Each expansion ring may have a width of up to 200 mm, preferably up to 100 mm, more preferably 83.5 mm.

In each embodiment of the method, the crown on the casting roll casting surface can be easily modified to achieve the desired casting strip thickness profile. Each expansion ring with an insulating coating is configured to change the crown and casting strip thickness profile of the casting roll casting surface by increasing or decreasing the radial dimension to cause expansion or contraction of the cylindrical tube. The thickness of the cylindrical tube can be in the range of 40-80 mm or 60-80 mm.

In each embodiment of the method, at least one sensor can be arranged downstream to detect the casting strip thickness profile and emit an electrical signal indicating the casting strip thickness profile. The sensor can be placed adjacent to the pinch roll through which the strip passes after casting. Casting roll Crown control of the cast surface can be achieved by controlling the radial dimensions of each expansion ring in response to an electrical signal received from the sensor. Furthermore, the crown control of the casting surface of the casting roll is performed by controlling the casting roll driving device to change the rotation speed of the casting roll and also changing the radial dimension of each expansion ring according to the electric signal received from the sensor. Can be achieved.

The radial dimensions of each expansion ring can be controlled independently of the radial dimensions of the other expansion rings. Casting Roll The radial dimensions of each expansion ring adjacent to the strip edge of the casting surface can be controlled independently of each other. In addition, the radial dimension of the expansion ring adjacent to the strip edge of the casting roll casting surface can be controlled independently of the expansion ring corresponding to the center of the casting strip.

A thin strip continuous casting apparatus that controls the roll crown is also disclosed, which a. A pair of casting rolls that rotate in opposite directions so that the casting strip can be fed downward from the roll gap with a roll gap in between, and the casting surface of each casting roll is 80 mm or less in thickness from copper and copper alloy. A pair of casting rolls made of a material selected from the group consisting of cylindrical tubes with multiple longitudinal water channels extending inside.
b. It has at least one heating element and an insulating coating and is configured to change the roll crown and casting strip thickness profile of the casting roll casting surface during casting by causing expansion of the cylindrical tube by increasing the radial dimension. A cylindrical structure that minimizes heat transfer from the expansion ring during casting to the casting roll by a heat insulating coating and regulates the expansion of the expansion ring and thus the cylindrical tube by providing an internal channel through which water can flow. With at least two expansion rings located adjacent to the shaped tube and spaced inward within 450 mm from the edge of the casting strip formed at the opposite end of the casting roll during the casting operation.
c. It consists of a metal supply system that is located above the roll gap and is capable of forming a casting reservoir supported on the casting roll casting surface by a side weir that defines the casting reservoir adjacent to the end of the roll gap.

The device may further consist of at least one sensor that is located downstream of the roll gap and is capable of detecting the casting strip thickness profile and emitting an electrical signal indicating the casting strip thickness profile, and the electrical signal received from the sensor. The roll crown of the casting roll casting surface during the casting operation is controlled by changing the radial dimension of the expansion ring accordingly.

Furthermore, the thin strip continuous casting device with roll crown control controls the casting roll drive device to change the rotation speed of the casting roll, while receiving the radial dimension of the heat insulating coated expansion ring from the sensor. It may consist of a control system that can be changed in response to a signal to control the roll crown on the casting surface of the casting roll during the casting operation.

In addition, the thin strip continuous casting apparatus that controls the roll crown further comprises at least one expansion ring located within the cylindrical tube at a position corresponding to the center of the casting strip formed on the casting roll during casting. The at least one expansion ring may have at least one heating element, be insulatingly coated, increase the radial dimension to cause expansion of the cylindrical tube, and cast roll casting surface crowns during casting. It is configured to change the casting strip thickness profile. Furthermore, the thin strip continuous casting device that controls the roll crown controls the casting roll driving device to change the rotation speed of the casting roll, and responds to an electric signal received from the at least one sensor at the edge of the casting strip. It may further consist of a control system that can change the roll crown of the casting roll casting surface during the casting operation by changing the radial dimension of the expansion ring away from and the radial dimension of the expansion ring corresponding to the center of the casting strip.

Alternatively, a thin strip continuous casting device that controls the roll crown
a. A pair of casting rolls that rotate in opposite directions so that the casting strip can be fed downward from the roll gap with a roll gap in between. The casting surface of each casting roll is 80 mm or less in thickness and is made of copper and a copper alloy. A pair of casting rolls made of a material selected from the group and formed by a cylindrical tube with multiple longitudinal water channels extending inside.
b. With at least one heating element and insulation coating, the insulation coating is configured to change the crown and casting strip thickness profile of the casting surface during casting by causing expansion of the cylindrical tube with increased radial dimensions. Within a cylindrical tube configured to minimize heat transfer from the expansion ring during casting to the casting roll and to regulate the expansion of the expansion ring and thus the cylindrical tube by providing an internal channel through which water can flow. , At least one expansion ring provided at a position corresponding to the center of the casting strip formed in contact with the casting roll during the casting operation.
c. It may consist of a metal supply system that is located above the roll gap and is capable of forming a casting reservoir supported on the casting roll casting surface by a side weir that defines the casting reservoir adjacent to the edge of the roll gap. ..

The device may further consist of at least one sensor located downstream of the roll gap that detects the casting strip thickness profile and emits an electrical signal indicating the casting strip thickness profile, and the electrical signal received from the at least one sensor. The roll crown of the casting roll casting surface during the casting operation is controlled by controlling the radial dimension of the expansion ring according to the above.

Furthermore, the roll crown controlled thin strip continuous casting apparatus controls the casting roll drive to change the rotational speed of the casting roll while measuring the radial dimension of the insulation coated expansion ring with at least one sensor. It may be configured by a control system capable of controlling the roll crown on the casting surface of the casting roll during the casting operation by changing according to the electric signal received from the casting roll.

In addition, a thin strip continuous casting device that controls the roll crown is adjacent within the cylindrical tube and is at least 450 mm inwardly separated from the casting strip edge formed at the reciprocal end of the casting roll during the casting operation. It may be further composed of two expansion rings. Each expansion ring has at least one heating element and is provided with a heat insulating coating. The insulation-coated expansion ring is configured to change the roll crown and casting strip thickness profile of the casting roll casting surface during the casting operation by increasing the radial dimension to cause the expansion of the cylindrical tube. There is.

Furthermore, the thin strip continuous casting device that controls the roll crown controls the casting roll drive device to change the rotation speed of the casting roll, and expands corresponding to the center of the casting strip in response to an electric signal received from the sensor. It may further consist of a control system capable of controlling the roll crown of the casting roll casting surface during the casting operation by changing the radial dimension of the ring and the radial dimension of the expansion ring away from the edge of the casting strip. ..

In each embodiment of the device, the expansion ring may be made of austenitic stainless steel such as 18/8 austenitic stainless steel. Each expansion ring may have an annular dimension of 50-150 mm (eg, 70 mm). Each expansion ring may have a width of up to 200 mm (eg, 83.5 mm).

In each embodiment of the device, each expansion ring with insulation coating increases the radial dimension to cause expansion of the cylindrical tube, altering the casting roll casting surface crown and casting strip thickness profile during casting. It is configured as. Each expansion ring has at least one heating element, which heating element can be made of stainless steel, nickel or nickel alloy and can be arranged as desired in the vicinity of each expansion ring. Each expansion ring can provide a heat input of up to 30 kW, preferably at least 3 kW.

Again, in each embodiment of the device, at least one sensor capable of detecting the casting strip thickness profile and emitting an electrical signal indicating the casting strip thickness profile can be placed downstream. The sensor may be placed adjacent to a pinch roll through which the strip passes after casting.

Crown control of the casting roll casting surface can be achieved by controlling the radial dimensions of each expansion ring in response to an electrical signal received from the sensor. Furthermore, the crown control of the casting surface of the casting roll controls the casting roll drive to change the rotation speed of the casting roll, while also receiving the radial dimensions of each insulation-coated expansion ring from the sensor. It can be achieved by changing according to the signal.

Casting rolls The radial dimensions of the expansion rings adjacent to the strip edges formed on the casting surface can be controlled independently of each other. In addition, the radial dimension of the expansion ring adjacent to the strip edge formed on the casting roll casting surface can be controlled independently of the expansion ring corresponding to the center of the casting strip.

Again, in the examples of the method and device, the insulation coating of the expansion ring is so thick that only a small amount of heat is transferred to the cylindrical tube and the expansion ring is expanded by heating to crown the casting roll during the casting operation. The shape can be controlled as desired. A thermal insulation coating with a thickness of at least 0.010 inches (eg 0.025 inches) is effective. Although the insulation coating can be applied to the cylindrical tube, in terms of economy and effectiveness, the insulation coating should be applied directly to the expansion ring and the expansion ring when assembling the casting roll.

In each of these embodiments of the method and device, a channel can also be provided within the expansion ring to allow water to flow into the channel of the ring and regulate the flow of water through these channels. By adjusting the water flowing through the expansion ring, the radial dimension of the expansion ring can be expanded and contracted, and by extension, the diameter of the cylindrical tube can be increased or decreased as desired to control the crown shape of the casting roll casting surface during work. it can.

Various aspects of the invention will become apparent to those skilled in the art from the following detailed description, drawings and claims.

It is a schematic side view of the twin roll casting machine of this disclosure. FIG. 5 is an enlarged partial cross-sectional view of a portion of the twin roll casting machine of FIG. 1, including a strip inspection device for strip profile measurement. It is a schematic diagram of a part of the twin roll casting machine of FIG. FIG. 5 is a cross-sectional view of a longitudinal portion of one of the casting rolls of FIG. 2 with an expansion ring corresponding to the central portion of the casting strip. FIG. 3 is a longitudinal sectional view of the remaining portion of the casting roll of FIG. 3A, connected by lines AA. It is a 4-4 line end view of the casting roll of FIG. 3A which showed the partial internal details by an imaginary line. FIG. 5 is a cross-sectional view taken along the line 5-5 of the casting roll of FIG. 3A. FIG. 6 is a sectional view taken along line 6-6 of the casting roll of FIG. 3A. FIG. 7 is a cross-sectional view taken along the line 7-7 of the casting roll of FIG. 3A. FIG. 5 is a cross-sectional view of a longitudinal portion of one of the casting rolls of FIG. 2 with two expansion rings separated from the ends of the casting strip. FIG. 5 is a cross-sectional view of a longitudinal portion of a casting roll with an expansion ring isolated from the end of the casting strip. FIG. 5 is a cross-sectional view of one longitudinal portion of the casting roll of FIG. 2 with two expansion rings separated from the end of the casting strip and an expansion ring corresponding to the center of the casting strip. It is sectional drawing of the expansion ring provided with a water channel. It is a comparison graph of the delta resistance temperature resistor temperature and time. It is a comparison graph of the temperature of the average expansion ring and the edge drop. It is a comparison graph of the expansion of a heated ring and the temperature in a casting machine. It is a side sectional view of the expansion ring provided with a heating element.

The present invention will be described in more detail with respect to the accompanying drawings.

With respect to FIGS. 1, 2 and 2A, the main machine frame 10 constituting the exemplified twin roll casting machine rises from the factory floor, and a pair of casting rolls 12 that are modularly attached to the roll cassette 11 and can rotate in opposite directions are provided. To support. The casting roll 12 is attached to the roll cassette 11 in order to facilitate work and movement as described below. The roll cassette 11 facilitates the rapid movement of the casting roll 12 prepared for casting from the set position to the casting work position in the casting machine, and the casting position of the casting roll 12 when the casting roll 12 is replaced. Is to remove quickly from. The roll cassette 11 does not have a particularly desired configuration, and may serve a function of facilitating the movement and arrangement of the casting roll 12 as described in the present specification.

A pair of reciprocally rotatable casting rolls 12 included in a casting apparatus for continuously casting thin steel strips have a casting surface 12A that is laterally arranged to form a roll gap 18 between them. The molten metal is supplied from the ladle 13 to the metal supply nozzle 17 (core nozzle) arranged between the casting rolls 12 above the roll gap 18 via the metal supply system. The molten metal thus fed forms a molten metal casting reservoir 19 supported on the casting surface 12A of the casting roll 12 above the roll gap 18. It is a pair of side closing plates, that is, side weirs 20 that surround the casting reservoir 19 in the casting area at the end of the casting roll 12 (indicated by a dotted line in FIG. 2A). The upper surface of the casting reservoir 19 (commonly referred to as the "meniscus" level) may be above the lower edge of the metal supply nozzle 17 so that the lower end of the metal supply nozzle 17 is immersed in the casting reservoir 19. The casting area includes the addition of a protective atmosphere above the casting reservoir 19 to suppress oxidation of the molten metal in the casting area.

The ladle 13 is usually of a conventional configuration supported on a rotating turret 40. To supply the metal, the ladle 13 is arranged above the movable tundish 14 at the casting position and fills the movable tundish 14 with molten metal. The tundish car 66, on which the movable tundish 14 can be placed, can transfer the movable tundish 14 from a heating station (not shown) that heats the movable tundish 14 to a casting position near the casting temperature. A tundish guide such as a rail 39 can be placed under the tundish car 66 to move the movable tundish 14 from the heating station to the casting position.

A slide gate 25 that can be operated by a servo mechanism is attached to the movable tundish 14, and molten metal is allowed to flow down from the movable tundish 14 to the distributor 16 via the slide gate 25 and further via the refractory outlet shroud 15. be able to. From the distributor 16, the molten metal flows to the metal supply nozzle 17 arranged between the casting rolls 12 above the roll gap 18.

The side weir 20 may be made of a refractory material which is an appropriate compound such as zirconia graphite, alumina graphite, boron nitride, boron nitride and zirconia. The side weir 20 has a face surface that is physically accessible to the molten metal of the casting roll 12 and the casting reservoir 19. The side weir holder (not shown) to which the side weir 20 is attached can be moved by a side weir actuator (not shown) such as a hydraulic or pneumatic cylinder, a servo mechanism or an actuator, and the side weir 20 is cast into a roll. It can be engaged with the ends of twelve. In addition, the side weir actuator can place the side weir 20 during casting. The side weir 20 forms an end closing portion of the metal melt reservoir on the casting roll 12 during the casting operation.

The casting strip 21 produced by the twin roll casting machine shown in FIG. 1 passes through the guide table 30 and reaches the pinch roll stand 31 composed of the pinch roll 31A. The casting strip 21 exiting the pinch roll stand 31 is composed of a pair of work rolls 32A and a backup roll 32B, and forms a gap capable of hot rolling the casting strip 21 fed from the casting roll 12 to form the casting strip 21. The strip surface and strip flatness can be improved by passing through the hot rolling mill 32 which is rolled down to a desired thickness by hot rolling. The work roll 32A has a work surface associated with the desired strip profile in the lateral direction of the work roll. The hot-rolled cast strip 21 then passes over the runout table 33, where it is cooled by contact with a coolant such as water supplied via a water jet 90 or other suitable means, and by convection or heat dissipation. obtain. In any case, the hot-rolled cast strip 21 can then be tensioned by passing through the second pinch roll stand 91 and then to the coiler 92. The thickness of the cast strip 21 before hot rolling may be between about 0.3 and 2.0 mm.

At the beginning of the casting operation, short lengths of incomplete strips usually occur before the casting state stabilizes. After continuous casting is established, the casting rolls 12 are slightly pulled apart and then reassembled to cause cutting of this tip of the casting strip 21 to form a clean head end of the next casting strip 21. The imperfect material falls into the scrap container 26, which is movable on the scrap container guide. The scrap container 26 is arranged at a scrap receiving position below the casting machine and constitutes a part of a sealed sealing portion 27 as described below. Normally, the sealing portion 27 is water-cooled. At this time, the water-cooled apron 28, which normally hangs from the pivot 29 to one side of the sealing portion 27, is swiveled to guide the clean end of the casting strip 21 to the guide table 30 and feed it to the pinch roll stand 31. Reach the position. The water-cooled apron 28 is then pulled back to the hanging position and the casting strip 21 can hang in a loop in the sealing portion 27 below the casting roll 12 towards the guide table 30, where it engages with a series of guide rollers. It fits.

The overflow vessel 38 is provided below the movable tundish 14 and can receive the molten material that can overflow from the movable tundish 14. As shown in FIG. 1, the overflow container 38 can be moved on a guide such as a rail 39, and can be arranged below the movable tundish 14 as desired at the casting position. In addition, an additional overflow vessel (not shown) may be placed adjacent to the distributor 16 for the distributor 16.

The sealed sealing portion 27 is configured by connecting a plurality of separate wall portions at various seal connecting portions to form a continuous sealing wall capable of controlling the atmosphere inside the sealing portion 27. In addition, since the scrap container 26 can be attached to the sealing portion 27, the sealing portion 27 can support the protective atmosphere directly under the casting roll 12 at the casting position. The sealing portion 27 includes an opening in the sealing portion lower portion 44, which is the lower portion of the sealing portion 27, and provides an outlet from the sealing portion 27 to the scrap container 26 at the scrap receiving position. The lower portion 44 of the sealing portion can extend downward as part of the sealing portion 27, and the opening is arranged above the scrap container 26 at the scrap receiving position. "Seal," "sealed," "sealing," and "seal," as used herein and with respect to the scrap container 26, seal 27 and related features. "Sealingly" is not a perfect seal to prevent leaks, but usually controls and maintains the atmosphere in the seal 27 as desired, including some tolerable leaks less than the perfect seal. It is a seal that can be made.

The rim portion 45 can surround the opening of the lower portion 44 of the sealing portion, can be movably arranged above the scrap container 26, and can be sealed and / or attached to the scrap container 26 at the scrap receiving position. The rim portion 45 can be moved between a seal position where the rim portion 45 engages with the scrap container 26 and a moving-out position where the rim portion 45 is removed from the scrap container 26. Alternatively, the foundry or scrap container 26 may include a lift mechanism to lift the scrap container 26 and engage it in a seal with the rim portion 45 of the sealing portion 27, and then lower the scrap container 26 to the retracted position. At the time of sealing, the sealing portion 27 and the scrap container 26 are filled with a desired gas such as nitrogen to reduce the amount of oxygen in the sealing portion 27 and provide a protective atmosphere for the casting strip 21.

The sealing portion 27 can include an upper collar portion 43 that supports a protective atmosphere directly below the casting roll 12 at the casting position. When the casting roll 12 is in the casting position, the upper collar portion 43 is moved to the extension position as shown in FIG. 2 to close the space between the housing portion 53 adjacent to the casting roll 12 and the sealing portion 27. .. The upper collar portion 43 can be provided in the sealing portion 27 or adjacent to the sealing portion 27 and adjacent to the casting roll 12, and has a plurality of actuators such as a servo mechanism, a hydraulic mechanism, a pneumatic mechanism, and a rotary actuator (FIG. Can be moved by (not shown).

As described below, the casting roll 12 is internally water-cooled, and as the casting roll 12 rotates in opposite directions, the casting surface 12A comes into contact with the casting reservoir 19 and passes through the casting reservoir 12 each time the casting roll 12 rotates. Therefore, the shell solidifies on the casting surface 12A. The shells are aligned with each other in the roll gap 18 of the casting roll 12 to create a casting strip 21 fed downward from the roll gap 18. The casting strip 21 is formed from a shell in the roll gap 18 between the casting rolls 12, is fed downward and moved downstream as described below.

Now, in relation to FIGS. 3A-10, the cylindrical tube 120 included in each casting roll 12 is made of a metal selected from the group consisting of copper and copper alloys and coated with a metal such as chromium or nickel or a metal alloy. Is optionally applied to form a cast surface 12A. Each cylindrical tube 120 can be mounted between a pair of stub shaft assemblies 121, 122. The ends 127, 128 (shown in FIGS. 4-6) of the stub shaft assemblies 121, 122, respectively, fit snugly into the ends of the cylindrical tube 120 to form the casting roll 12. Thus, the cylindrical tube 120 is supported by ends 127, 128 having flanges 129, 130, respectively, to form an internal cavity 163, and the assembled casting roll is supported between the stub shaft assemblies 121, 122.

The cylindrical outer surface of each cylindrical tube 120 is the roll casting surface 12A. The radial thickness of the cylindrical tube 120 can be 80 mm or less, and may be 40-80 mm or 60-80 mm.

A series of longitudinal waterways 126 provided in each cylindrical tube 120 can be formed by perforating a long hole from one end to the other end of the circumferential thickness of the cylindrical tube 120. The ends of the holes are later closed by end plugs 141 attached to the ends 127, 128 of the stub shaft assemblies 121, 122 by fasteners 171. The water channel 126 is formed to the thickness of a cylindrical tube 120 with an end plug 141. The number of stub shaft fasteners 171 and end plugs 141 can be selected as desired. The end plug 141 can provide single-pass cooling or multi-pass cooling from one end to the other end of the casting roll 12 in the channel in the stub shaft assembly described below, with multi-pass cooling, for example, channel 126. After being connected to each other to provide three passes of cooling water through the adjacent channel 126, the water is returned to the water supply, either directly or through the cavity 163.

A channel 126 through the thickness of the cylindrical tube 120 can be connected to a water supply in series with the cavity 163. Since the channel 126 can be connected to the water supply, the cooling water either first passes through the cavity 163 and then through the channel 126 to the return line, or first through the channel 126 and then through the cavity 163 to the return line. To reach.

A circumferential step 123 is provided at the end of the cylindrical tube 120, and a shoulder portion 124 can be formed between the end of the cylindrical tube 120 and the operating portion of the roll casting surface 12A of the casting roll 12. A shoulder portion 124 is provided and engages with the side weir 20 to enclose the casting reservoir 19 during the casting operation as described above.

Each of the ends 127, 128 of the stub shaft assemblies 121, 122 typically has seal engagement with the end of the cylindrical tube 120 and has radial channels 135, 136 as shown in FIGS. 4-6 to provide water. It is fed to the water channel 126 extending in the cylindrical tube 120. The radial channels 135, 136 are connected to at least some ends of the channel 126, for example in a screwed arrangement, depending on whether the cooling is a single-pass or multi-pass cooling system. If the water cooling is a multi-pass system, the remaining ends of the channel 126 can be closed, for example, by screwing in the end plug 141 as described.

As detailed in FIG. 7, the cylindrical tubes 120 may be arranged in an annular arrangement to the thickness of the cylindrical tube 120 in a single-pass or multi-pass arrangement of channels 126, if desired. The channel 126 is connected to the annular gallery 140 by a radial port 160 at one end of the casting roll 12 and thus to the radial flow path 135 at the end 127 of the stub shaft assembly 121, and at the other end of the casting roll 12 by a radial port 161. It is connected to 150 and thus to the radial flow path 136 at the end 128 of the stub shaft assembly 121. Water supplied through one of the annular galleries 140 or 150 at one end of the roll 12 flows in parallel through all of the single path channels 126 to the other end of the roll 12 and at the other end of the cylindrical tube 120. It can flow out through the radial flow path 135 or 136 and the other annular gallery 150 or 140. The directional flow can be reversed as desired by appropriate connections between the supply line and the return line. Alternatively, or additionally, a multi-pass configuration such as 3 passes can be provided by optionally connecting some of the selected channels 126 to radial paths 135, 136 or optionally blocking from radial paths 135, 136.

The stub axis assembly 122 may be longer than the stub axis assembly 121. As shown in FIG. 3B, the stub shaft assembly 122 may include two sets of water flow ports 133, 134. Water is fed and delivered to the casting roll 12 in the axial direction via the stub shaft assembly 122 by the rotating water flow couplings 131 and 132 that can be connected to the water flow ports 133 and 134. In the work, the cooling water flows in and out of the water channel 126 of the cylindrical tube 120 via the radial paths 135 and 136 extending through the ends 127 and 128 of the stub shaft assemblies 121 and 122, respectively. The stub shaft assembly 121 is fitted with an axial tube 137 to provide fluid communication between the radial path 135 at the end 127 and the central cavity within the casting roll 12. The stub shaft assembly 122 is fitted with an axial space tube to allow a central water conduit 138 that fluidly communicates with the central cavity 163 to an annular water conduit 139 that fluidly communicates with the radial path 136 at the end 122 of the stub shaft assembly 122. To separate. The central water conduit 138 and the annular water conduit 139 can provide the inflow and outflow of cooling water to the casting roll 12.

In the work, the inflowing cooling water can be supplied from the supply line 131 to the annular water conduit 139 through the radial path 136, the annular gallery 150 and the water flow port 133 that communicates with the water channel 126, and then the annular gallery 140, It is returned to the outflow line 132 via the radial path 135, the axial tube 137, the central cavity 163 and the central water conduit 138 via the water flow port 134. Alternatively, the inflow and outflow and passage of the water flow to the casting roll 12 may be in the opposite direction, if desired. The water flow ports 133 and 134 can be connected to the water supply line and the return line so that they can flow in and out of the water channel 126 of the cylindrical tube 120 of the casting roll 12 from any direction as desired. Depending on the direction of flow, the cooling water flows through the cavity 163 before or after flowing through the channel 126.

Each cylindrical tube 120 can be provided with at least one expansion ring with a heat insulating coating. As shown in FIG. 8, each of the cylindrical tubes 120 is provided with a heat insulating coating 350, and at least the opposite ends of the cylindrical tubes 120 are separated from each other within 450 mm inside the casting strip end formed by the casting operation. Two expansion rings 210 can be provided. FIG. 9 is a cross-sectional view of a longitudinal portion of a casting roll provided with an expansion ring 210 provided with a heat insulating coating 350, separated from the edge of the casting strip and having a heating element 370.

Alternatively, as shown in FIG. 10, at least two expansion rings 210 coated with a heat insulating coating 350 are placed at the reciprocal ends of the cylindrical tube 120, inside the reciprocal end of the casting roll in the casting operation from the casting strip end. An additional expansion ring 220, separated within 450 mm and provided with a heat insulating coating 330, is placed in the cylindrical tube 120 at a position corresponding to the central portion of the casting strip formed on the casting surface during casting.

In another modification, as shown in FIG. 3A, the expansion ring 220 with the insulation coating 330 is located in the cylindrical tube 120 at a position corresponding to the center of the casting strip formed on the casting roll casting surface during casting. Can be placed in.

As shown in FIGS. 8-10, the insulatingly coated expansion ring is adjacent to the cylindrical tube and can be separated from the edge of the cast strip. Each expansion ring can have an annular dimension of 50-150 mm (eg 70 mm). Similarly, an expansion ring that is insulatingly coated and placed corresponding to the central portion of the casting strip formed during casting can have an annular dimension of 50-150 mm (eg 70 mm).

Each expansion ring, with a heat insulating coating and separated from the edge of the cast strip, can have a width of up to 200 mm (eg, 83.5 mm). Similarly, an expansion ring that is insulatingly coated and placed in the center of the casting strip during casting can have a width of up to 200 mm (eg, 83.5 mm).

Casting Roll The deformation of the crown on the casting surface can be controlled by adjusting the radial dimensions of at least one expansion ring located inside the cylindrical tube. The radial dimension of at least one expansion ring with an insulating coating can be controlled by adjusting the temperature of the expansion ring. Thus, the casting strip thickness profile can be controlled by the radius of the expansion ring and thus the crown on the casting roll casting surface. Since the circumferential thickness of the cylindrical tube is 80 mm or less, the crown on the cast surface can be deformed in response to changes in the radial dimensions of the expansion ring.

Each insulation-coated expansion ring is configured to change the crown and casting strip thickness profile of the casting surface during casting by increasing the radial dimension and causing expansion of the cylindrical tube. Power wire 222 and control wire 224 extend from slip ring 240 to each expansion ring. The power wire 222 supplies power to the expansion ring. The control wire 224 provides temperature feedback, which is used to control the power of the expansion ring.

As shown in FIG. 11, each expansion ring may have a channel 340 through which water can flow. The expansion of the expansion ring can be adjusted by controlling the water flow.

Each expansion ring can be electrically heated to increase its radial dimension. As shown in FIG. 15, each expansion ring has at least one heating element arranged as desired to effectively heat the ring. The expansion ring 300 has a heating element 310 on the right side and a heating element 320 on the left side for that purpose. Each expansion ring can provide a heat input of up to 30 kW, preferably at least 3 kW. The force generated by the radial dimension increase is applied to the cylindrical tube, causing expansion of the cylindrical tube and changing the crown and casting strip thickness profile of the casting surface. In order to achieve the desired thickness profile by controlling the radial dimension of the expansion ring and controlling the casting speed, the strip thickness profile sensor 71 is arranged downstream as shown in FIGS. 2 and 2A to obtain the thickness profile of the casting strip 21. Can be detected. The sensor 71 is usually provided between the roll gap 18 and the pinch roll 31A for direct control of the casting roll 12. This sensor may be an appropriate device such as an X-ray measuring instrument capable of directly measuring the thickness profile in the strip width direction periodically or continuously. Alternatively, a plurality of non-contact sensors are arranged on the guide table 30 in the lateral direction of the casting strip 21, and a combination of thickness measurement from a plurality of positions in the lateral direction of the casting strip 21 is processed by the controller 72 to obtain a strip thickness profile. Is calculated periodically or continuously. The thickness profile of the cast strip 21 can be determined periodically or continuously from this data as desired.

The radial dimension of each expansion ring can be controlled independently of the radial dimension of the other expansion rings. The radial dimensions of each expansion ring, which is insulated and adjacent to the inside of the strip end of the casting roll, can be controlled independently of each other. Alternatively, the radial dimension of the expansion ring adjacent to the inside of the strip end of the casting roll is insulated and can be controlled independently of the expansion ring corresponding to the center of the casting strip. The sensor 71 emits a signal indicating a casting strip thickness profile. The radial dimension of each expansion ring with insulation coating is controlled according to the signal emitted by the sensor, which controls the roll crown of the casting roll casting surface during the casting operation.

Furthermore, while controlling the casting roll drive to change the rotation speed of the casting roll, the radial dimension of the expansion ring can also be changed according to the electrical signal received from the sensor 71, thereby during the casting operation. Casting roll Controls the roll crown on the casting surface.

It has been found that an insulating coating is needed to control the heat transfer from the expansion ring to the casting roll. Tests performed have shown that heat transfer from the expansion ring during casting to the casting roll is minimal when the insulation coating is applied, allowing the expansion ring to reach the desired temperature and expansion, and thus the desired cross section. The strip thickness profile can be reached and the crown on the cast surface can be controlled commercially.

For illustration purposes, FIG. 12 shows tests performed with and without adiabatic coating on the expansion ring. An 8% yttria-stabilized zirconia adiabatic coating was plasma jetted outside the expansion ring to give a 0.025 inch thick adiabatic coating. Each expansion ring had a cast roll portion approximately 85 mm wide that was shrunk into the expansion ring. A water channel was provided in each casting roll portion. Water was supplied at approximately 15 pounds per square inch and the water flow varied between 8.6 and 8.9 gallons / minute. The inlet water temperature was 68 ° F. The tests were performed separately for 50% power and 100% power. As shown in FIG. 12, the expansion ring ended up at a beak delta temperature of 54 ° C. in the test at 50% power. On the other hand, the insulatingly coated expansion ring resulted in a peak delta temperature of 90 ° C., a 67% increase in beak delta temperature. As shown in FIG. 12, heating of the uncoated expansion ring at 100% power failed in the test, but the test at 100% power of the insulating coated expansion ring reached a peak delta temperature of approximately 130 ° C. finished.

FIG. 13 shows a graph comparing the temperature of the average expansion ring with the edge drop. Edge drops correlate with the thickness of the cast strip. As shown in FIG. 13, the edge drop appears to react as each heated expansion ring changes temperature. As the temperature increases, the expansion ring expands, the casting strip thickness at the casting roll edge decreases, and the edge drop increases.

FIG. 14 shows a comparative graph of the expansion of a heated ring and the temperature of an expansion ring coated with an insulating coating. The expansion ring was placed adjacent to the casting roll in a normal casting operation, and a water channel was provided inside to allow water to flow. The coated expansion ring was heated from 85.6 ° F to 120 ° F, held at 120 ° F for some time, and then heated to 160-200 ° F. As evidenced, dimensional expansion greater than 100 μm was achieved when the coated expansion ring was heated to 115 ° F. As described, with an uncoated expansion ring, these results would not be possible due to heat transfer to the casting roll. The expansion of the expansion ring is directly related to the temperature at which the expansion ring can be heated. As described, the expansion ring coated with an insulating coating can be heated rapidly to achieve a high effective temperature. Therefore, an insulating coating with a thickness of at least 0.010 inches (eg 0.025 inches) is essential to control or eliminate heat transfer from the expansion ring to the casting roll.

In each of these embodiments of the method and device, water channels may also be provided within the expansion ring to allow water to flow through the paths within the ring and to regulate the flow of water through these channels. By adjusting the water flow, the diameter of the expansion ring and thus the cylindrical tube can be increased or decreased as desired to control the shape of the casting roll during work.

Although the principles and actions have been described and illustrated in relation to specific embodiments, it must be understood that the present invention can be carried out without departing from the scope of anything other than those specifically described and exemplified.

12 Casting Roll 12A Roll Casting Surface 14 Movable Tandish 15 Fireproof Outlet Shroud 16 Distributor 17 Metal Supply Nozzle 18 Roll Gap 20 Side Weir 21 Casting Strip 71 Profile Sensor 120 Cylindrical Tube 126 Water Channel 127 End 210 Expansion Ring 220 Expansion Ring 300 Expansion ring 310 Heating element 320 Heating element 330 Insulation coating 340 Waterway 350 Insulation coating 370 Heating element

Claims (39)

a. It has a pair of casting rolls that rotate in opposite directions so that the casting strip can be fed downward from the roll gap with a roll gap in between, and the casting surface of each casting roll is 80 mm or less in thickness and is made of copper and a copper alloy. Assemble a casting machine, made of a material selected from the group and formed by a cylindrical tube with multiple longitudinal water channels extending inside.
b. At least two expansion rings are placed adjacent to each other in a cylindrical tube within 450 mm inward from the edge of the casting strip formed at the opposite end of the casting roll during the casting operation, with each expansion ring having at least one heating. Casting with elements and insulation coating, configured to change the roll crown and casting strip thickness profile of the casting roll casting surface during casting by causing expansion of the cylindrical tube by increasing radial dimensions, casting with insulation coating It is configured to minimize heat transfer from the expansion ring inside to the casting roll and to regulate the expansion of the expansion ring and thus the cylindrical tube by providing a water channel in each expansion ring through which water can flow.
c. Assemble a metal supply system capable of forming a casting reservoir supported on the casting roll casting surface above the roll gap by a side weir that defines the casting reservoir adjacent to the edge of the roll gap.
d. A roll crown configured by controlling the roll crown of a cast roll casting surface during a casting operation by controlling the radial dimensions of the expansion ring in response to at least one of the digital or analog signals received from at least one sensor. Controlled thin strip continuous casting method. e. At least one of the following characteristics can be detected
Expansion ring temperature,
Downstream Cast Strip Thickness Profile,
Local thickness of the casting strip at a specified point near the edge of the casting strip,
Radial casting roll expansion at a defined point near the casting roll surface crown during casting and the casting strip edge,
The roll crown controlled thin strip continuous casting method of claim 1, further comprising arranging at least one sensor capable of emitting a digital or analog signal indicating at least one of the above characteristics of the cast strip. f. It is further configured by placing at least one expansion ring in the cylindrical tube corresponding to the central part of the casting strip formed on the casting roll during casting, each expansion ring having at least one heating element and insulation coating. And the casting roll is configured to change the crown and casting strip thickness profile of the casting roll casting surface during casting by causing the expansion of the cylindrical tube by increasing the radial dimension, and the casting roll from the expansion ring during casting with an insulating coating. The roll according to claim 1 or 2, wherein a water channel through which water can flow is provided in each expansion ring to minimize heat transfer to the expansion ring, thereby adjusting the expansion of the expansion ring and thus the cylindrical tube. Thin strip continuous casting method with crown control. The roll crown controlled thin strip continuous casting method according to any one of claims 1 to 3, wherein the heating element of the expansion ring is made of stainless steel, nickel or nickel alloy. g. While controlling the casting roll drive to change the rotational speed of the casting roll, the radial dimension of the insulatingly coated expansion ring depends on at least one of the digital or analog signals received from the at least one sensor. The thin strip continuous casting method by roll crown control according to claim 2, further comprising controlling the roll crown on the casting roll casting surface during the casting operation by modifying it. h. Corresponds to the radial dimension of the expansion ring, which is insulated and separated from the edge of the casting strip, and the central part of the casting strip, which is insulated and coated, while controlling the casting roll drive to change the rotation speed of the casting roll. It is further configured by changing the radial dimension of each expansion ring according to at least one of the digital or analog signals received from at least one sensor to control the roll crown of the casting roll casting surface during the casting operation. , The method for continuous thin strip casting by roll crown control according to claim 3. The roll crown controlled thin strip continuous casting method according to any one of claims 1 to 6, wherein the expansion ring is heat-insulated and each expansion ring has an annular dimension of 50 to 150 mm. The roll crown controlled thin strip continuous casting method according to any one of claims 1 to 6, wherein the expansion ring is provided with a heat insulating coating and has a width of up to 200 mm. The roll crown controlled thin strip continuous casting method according to any one of claims 1 to 8, wherein the expansion ring is provided with a heat insulating coating and each expansion ring provides a heat input of up to 30 kW. The thinness by roll crown control according to any one of claims 1 to 9, wherein the roll crown of the cast roll cast surface can be controlled by applying a heat insulating coating and independently controlling the radial dimension of each expansion ring. Strip continuous casting method. i. Further configured by changing the radial dimensions of the expansion ring while changing the horizontal distance between the axial centerlines of the casting roll by controlling the position of the casting roll, each expansion ring with a heat insulating coating is described above. Controlling the roll crown of the casting roll casting surface during the casting operation corresponding to at least one characteristic at the center or edge of the casting strip in response to at least one of the digital or analog signals received from at least one sensor. The thin strip continuous casting method according to claim 3, wherein the roll crown is controlled. a. It has a pair of casting rolls that rotate in opposite directions so that the casting strip can be fed downward from the roll gap with a roll gap in between, and the casting surface of each casting roll is 80 mm or less in thickness and is made of copper and a copper alloy. Assemble a casting machine, made of a material selected from the group and formed by a cylindrical tube with multiple longitudinal water channels extending inside.
b. At least one expansion ring is placed in the cylindrical tube corresponding to the center of the casting strip formed in contact with the casting roll during the casting operation, and each expansion ring has at least one heating element and insulation coating. The heat insulation from the expansion ring during casting to the casting roll is configured to change the crown and casting strip thickness profile of the casting surface during casting by causing expansion of the cylindrical tube by increasing the radial dimension. It is configured so that the expansion of the expansion ring and thus the cylindrical tube can be adjusted by providing a channel in each expansion ring that minimizes transmission and allows water to flow.
c. Assemble a metal supply system capable of forming a casting reservoir supported on the casting roll casting surface above the roll gap by a side weir that defines the casting reservoir adjacent to the edge of the roll gap.
d. Casting roll during casting operation Roll crown on the casting surface by controlling the radial dimension of at least one expansion ring with the insulation coating in response to at least one of the digital or analog signals received from at least one sensor. A thin strip continuous casting method with roll crown control consisting of controlling. e. At least one of the following characteristics can be detected
The temperature of the at least one expansion ring,
Downstream casting strip thickness profile,
Local thickness of the casting strip at the specified point near the edge of the casting strip,
Casting roll surface crown during casting work,
Radial casting roll expansion at a defined point near the edge of the casting strip,
The roll crown controlled thin strip continuous casting according to claim 12, further comprising arranging at least one sensor capable of emitting a digital or analog signal indicating at least one of the above-mentioned characteristics of the cast strip. Method. The roll crown controlled thin strip continuous casting method according to claim 12 or 13, wherein at least one heating element is made of stainless steel, nickel or nickel alloy. f. Controlling the casting roll drive to change the rotational speed of the casting roll while changing the radial dimensions of the insulation-coated at least one expansion ring to produce a digital or analog signal received from the at least one sensor. The method for continuous thin strip casting by roll crown control according to any one of claims 12 to 14, further comprising controlling the roll crown of the casting roll casting surface during the casting operation according to at least one. The roll crown controlled thin strip continuous casting method according to any one of claims 12 to 15, wherein at least one expansion ring with a heat insulating coating has an annular dimension of 50 to 150 mm. The roll crown controlled thin strip continuous casting method according to any one of claims 12 to 15, wherein at least one expansion ring with a heat insulating coating has a width of up to 200 mm. The roll crown controlled thin strip continuous casting method according to any one of claims 12 to 17, wherein at least one expansion ring with a heat insulating coating provides a heat input of up to 30 kW. The roll crown according to any one of claims 12 to 18, wherein the roll crown on the cast surface of the cast roll can be controlled by independently controlling each expansion ring corresponding to the central portion of the cast strip, which is provided with a heat insulating coating. Controlled thin strip continuous casting method. g. Each of which is further configured and heat-insulated by changing the radial dimension of the at least one expansion ring while changing the horizontal distance between the casting roll axial centerlines by controlling the position of the casting roll. The expansion ring controls the roll crown of the casting roll casting surface during the casting operation in response to at least one characteristic in the center of the casting strip in response to at least one of the digital or analog signals received from the at least one sensor. The thin strip continuous casting method by roll crown control according to any one of claims 12 to 19. a. A pair of casting rolls that rotate in opposite directions so that the casting strip can be fed downward from the roll gap with a roll gap in between, and the casting surface of each casting roll is 80 mm or less in thickness from copper and copper alloy. A pair of casting rolls made of a material selected from the group consisting of cylindrical tubes with multiple longitudinal water channels extending inside.
b. It has at least one heating element and an insulating coating and is configured to change the roll crown and casting strip thickness profile of the casting roll casting surface during casting by causing expansion of the cylindrical tube by increasing the radial dimension. A cylindrical structure that minimizes heat transfer from the expansion ring during casting to the casting roll by a heat insulating coating and regulates the expansion of the expansion ring and thus the cylindrical tube by providing an internal channel through which water can flow. With at least two expansion rings located adjacent to the shaped tube and spaced inward within 450 mm from the edge of the casting strip formed at the opposite end of the casting roll during the casting operation.
c. Roll crown control consisting of a metal supply system located above the roll gap and capable of forming a casting reservoir supported on the casting roll casting surface by a side weir that defines the casting reservoir adjacent to the end of the roll gap. Thin strip continuous casting equipment. d. At least one of the following characteristics can be detected
Expansion ring temperature,
Cast strip thickness profile placed downstream of the roll gap,
Local thickness of the casting strip at a specified point near the edge of the casting strip,
Casting roll surface crown during casting operation It is further composed of at least one sensor capable of emitting a digital or analog signal indicating radial casting roll expansion and at least one of the above characteristics at a defined point close to the casting strip edge. The thin strip by roll crown control according to claim 21, wherein the roll crown of the casting roll casting surface during the casting operation is controlled by controlling the radial dimension of the expansion ring in response to a signal received from the at least one sensor. Continuous casting equipment. e. It is further composed of at least one expansion ring in a cylindrical tube corresponding to the center of the casting strip formed on the casting roll during the casting operation, each expansion ring having at least one heating element and an insulating coating in the radial direction. The increased size is configured to change the crown and casting strip thickness profile of the roll casting surface during casting by causing the expansion of the cylindrical tube, and the insulation coating transfers heat from the expansion ring during casting to the casting roll. The roll crown control according to claim 21 or 22, which is configured to adjust the expansion of the expansion ring and thus the cylindrical tube by providing a minimum water passage in each expansion ring through which water can flow. Strip continuous casting equipment. f. The electrical signal received from the at least one sensor is the radial dimension of the expansion ring, which is insulated and separated from the edge of the casting strip, while controlling the casting roll drive to change the rotational speed of the casting roll. 22. The roll crown controlled thin strip continuous casting apparatus according to claim 22, further comprising a control system capable of controlling the roll crown of the casting roll casting surface during the casting operation by changing accordingly. The roll crown controlled thin strip continuous casting apparatus according to any one of claims 21 to 24, wherein the expansion ring is provided with a heat insulating coating and has an annular dimension of 50 to 150 mm. The roll crown controlled thin strip continuous casting apparatus according to any one of claims 21 to 24, wherein each expansion ring provided with a heat insulating coating and separated from the edge of the casting strip has a width of up to 200 mm. The roll crown controlled thin strip continuous casting apparatus according to any one of claims 21 to 26, wherein each expansion ring with a heat insulating coating provides a heat input of up to 30 kW. The thinness by roll crown control according to any one of claims 21 to 27, wherein the roll crown of the cast surface of the cast roll can be controlled by independently controlling the radial dimension of each expansion ring provided with the heat insulating coating. Strip continuous casting equipment. The roll crown controlled thin strip continuous casting apparatus according to any one of claims 21 to 28, wherein the heating element is made of stainless steel, nickel or nickel alloy. a. A pair of casting rolls that rotate in opposite directions so that the casting strip can be fed downward from the roll gap with a roll gap in between. The casting surface of each casting roll is 80 mm or less in thickness and is made of copper and a copper alloy. A pair of casting rolls made of a material selected from the group and formed by a cylindrical tube with multiple longitudinal water channels extending inside.
b. With at least one heating element and insulation coating, the insulation coating is configured to change the crown and casting strip thickness profile of the casting surface during casting by causing expansion of the cylindrical tube with increased radial dimensions. Within a cylindrical tube configured to minimize heat transfer from the expansion ring during casting to the casting roll and to regulate the expansion of the expansion ring and thus the cylindrical tube by providing an internal channel through which water can flow. , At least one expansion ring provided at a position corresponding to the center of the casting strip formed in contact with the casting roll during the casting operation.
c. A metal supply system capable of forming a casting reservoir supported on the casting roll casting surface by a side weir located above the roll gap and defining the casting reservoir adjacent to the edge of the roll gap.
Thin strip continuous casting equipment with roll crown control consisting of. d. At least one of the following characteristics can be detected
The temperature of at least one expansion ring;
Cast strip thickness profile located downstream of the roll gap,
Local thickness of the casting strip at a specified point near the center of the casting strip,
Casting roll surface crown during casting work,
Radial casting roll expansion at a defined point near the center of the casting strip,
It is further composed of at least one sensor capable of emitting a digital or analog signal exhibiting at least one of the above characteristics, and the radial dimension of the at least one expansion ring according to the signal received from the at least one sensor. The thin strip continuous casting apparatus according to claim 30, wherein the roll crown of the casting roll casting surface during the casting operation is controlled by controlling the roll crown control. e. During the casting operation, the rotational speed of the casting roll is changed by controlling the casting roll drive device, and the radial dimension of the at least one expansion ring is changed according to the electric signal received from the at least one sensor. Casting The thin strip continuous casting apparatus according to claim 31, further comprising a control system capable of changing the roll crown of the roll casting surface. The roll crown controlled thin strip continuous casting apparatus according to any one of claims 30 to 32, wherein the insulation coating is applied and at least one expansion ring corresponding to the central portion of the casting strip has an annular dimension of 50 to 150 mm. .. The roll crown controlled thin strip continuous casting apparatus according to any one of claims 30 to 32, wherein the insulation coating is applied and at least one expansion ring corresponding to the central portion of the casting strip has a width of up to 200 mm. The roll crown controlled thin strip continuous casting apparatus according to any one of claims 30 to 34, wherein at least one expansion ring corresponding to the central portion of the casting strip is provided with a heat insulating coating and provides a heat input of up to 30 kW. The roll crown control according to any one of claims 30 to 35, wherein each expansion ring that is heat-insulated and corresponds to the central portion of the casting strip is independently controlled to control the roll crown of the cast roll casting surface. Thin strip continuous casting equipment by. The roll crown controlled thin strip continuous casting apparatus according to any one of claims 30 to 36, wherein the at least one heating element is made of stainless steel, nickel or a nickel alloy. a. It has a pair of casting rolls that rotate in opposite directions so that the casting strip can be fed downward from the roll gap with a roll gap in between, and the casting surface of each casting roll is 80 mm or less in thickness and is made of copper and a copper alloy. Assemble a casting machine, made of a material selected from the group and formed by a cylindrical tube with multiple longitudinal water channels extending inside.
b. At least two expansion rings, each with at least one heating element and an insulating coating, are adjacent in a cylindrical tube within 450 mm inward from the edge of the casting strip formed at the reciprocal end of the casting roll during the casting operation. The adiabatic coating is provided under similar operating conditions with a similar uncoated expansion ring to the cylindrical tube when the cylindrical tube is cooled in the longitudinal water flow path and the heating element is activated. It has a thickness that can achieve a temperature difference that is at least 50% larger than the original temperature difference.
c. Assemble a metal supply system capable of forming a casting reservoir supported on the casting roll casting surface above the roll gap by a side weir that defines the casting reservoir adjacent to the edge of the roll gap.
d. The roll crown of the casting roll casting surface during the casting operation is controlled by controlling the radial dimensions of the expansion ring in response to at least one of the digital or analog signals received from at least one sensor.
e. A roll crown controlled thin strip continuous casting method comprising providing a channel through which water can pass through each expansion ring and controlling the flow of water to adjust the expansion of the expansion ring. a. A pair of casting rolls that rotate in opposite directions so that the casting strip can be fed downward from the roll gap with a roll gap in between, and the casting surface of each casting roll is 80 mm or less in thickness from copper and copper alloy. A pair of casting rolls made of a material selected from the group consisting of cylindrical tubes with multiple longitudinal water channels extending inside.
b. It has at least one heating element and an insulating coating, which is similar to the uncoated cylindrical tube with an expansion ring relative to the cylindrical tube when the cylindrical tube is cooled in the longitudinal water flow path and the heating element is activated. It has a thickness that can achieve a temperature difference of at least 50% greater than the temperature difference under similar operating conditions due to the expansion ring, and has a water channel inside that allows water to flow and regulates the expansion of the expansion ring. At least two expansion rings arranged adjacent to each other in a cylindrical tube configured to be provided and spaced inward within 450 mm from the edge of the casting strip formed at the opposite end of the casting roll during the casting operation.
c. Roll crown control consisting of a metal supply system located above the roll gap and capable of forming a casting reservoir supported on the casting roll casting surface by a side weir that defines the casting reservoir adjacent to the end of the roll gap. Thin strip continuous casting equipment.

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