CASTING-ROLLING METHOD BASED ON MULTI-LAYER HETEROGENEOUS COMPOSITE ROLL SLEEVE AND APPARATUS THEREOF

Abstract

The present disclosure relates to metal material casting-rolling forming technology, and specifically to a casting-rolling method and apparatus based on a multi-layer heterogeneous composite roll sleeve. By alternately arranging a plurality of metal components on the composite roll sleeve and adjusting distribution of the metal components in the composite roll sleeve according to structural parameters and process parameters of the monometallic metals and layered metal composite materials, a layer thickness of the metal components at different radial positions of the composite roll sleeve is determined based on the solidification range of monometallic metals and the offset of the solidification point position in the heat transfer process of layered metal composite materials. This can significantly improve forming quality of strips.

Claims

1. A casting-rolling method based on a multi-layer heterogeneous composite roll sleeve, comprising following steps: S1, determining structural and process parameters for casting-rolling of a target metal, and determining an N-layer arrangement of M metal components of the composite roll sleeve, analyzing a heat transfer thermal resistance path, and determining a layer thickness of each of the metal components of the composite roll sleeve in a radial direction of the composite roll sleeve based on a solidification temperature range, a target solidification point position, and an asymmetric heat transfer solidification point offset of the target metal; S2, preparing the composite roll sleeve according to the N-layer arrangement of the M metal components and the layer thickness of each of the metal components as determined in step S1, a spatial composite interface being present between adjacent metal components, and then assembling the composite roll sleeve with a casting-rolling mill set; S3, allowing the target metal to flow from a pouring system into a casting-rolling zone enclosed by a plurality of composite roll sleeves, and under solidification and rolling deformation actions of the composite roll sleeve, a solidification point is at a target solidification point position, and the target metal is solidified and deformed to obtain a target metal product.

2. The casting-rolling method based on the multi-layer heterogeneous composite roll sleeve according to claim 1, wherein in step S3, when the target metal is a monometallic metal, liquid monometallic metal flows from the pouring system into the casting-rolling zone enclosed by the plurality of composite roll sleeves, and under solidification and rolling deformation actions of the composite roll sleeve, the solidification point is at the target solidification point position, and the liquid monometallic metal is solidified and deformed to obtain a monometallic metal strip.

3. The casting-rolling method based on the multi-layer heterogeneous composite roll sleeve according to claim 1, wherein in step S3, when the target metal is a layered metal composite material, a solid base metal is fed into a solid casting-rolling zone enclosed by the plurality of composite roll sleeves through an uncoiling device, liquid cladding metal enters the solid-liquid casting-rolling zone from the pouring system, and under asymmetric solidification and rolling deformation actions of the plurality of composite roll sleeves, the solidification point is at the target solidification point position, and the liquid cladding metal is solidified and deformed to achieve metallurgical bonding with the solid base metal to obtain a layered metal composite material.

4. The casting-rolling method based on the multi-layer heterogeneous composite roll sleeve according to claim 1, wherein in step S1, each of the metal components has a uniform or variable layer thickness in the radial direction of the composite roll sleeve.

5. The casting-rolling method based on the multi-layer heterogeneous composite roll sleeve according to claim 4, wherein in step S1, the M metal components are arranged in N layers in an alternating manner along a circumferential direction of the composite roll sleeve, and N is an integer between M and 3M.

6. The casting-rolling method based on the multi-layer heterogeneous composite roll sleeve according to claim 4, wherein in step S1, the target solidification point position is a center of a roll gap, and the asymmetric heat transfer solidification point offset is an offset of the asymmetric heat transfer solidification point position relative to the target solidification point position.

7. A casting-rolling apparatus for the casting-rolling method based on the multi-layer heterogeneous composite roll sleeve according to claim 1, comprising: a main drive system, a main frame, a position control system, a pouring system, a casting-rolling mill set, and an uncoiling device, wherein an output shaft of the main drive system is connected to a first end of a roll core of the casting-rolling mill set, the casting-rolling mill set is disposed at a first end of the main frame, the position control system is disposed at a second end of the main frame and connected to the casting-rolling mill set, the uncoiling device is disposed at a third end of the main frame, and the pouring system is disposed at an end of the uncoiling device; the casting-rolling mill set comprises: a roll core, a first bearing seat, a composite roll sleeve, a second bearing seat, and a rotary joint, wherein the roll core extends axially through the first bearing seat, the composite roll sleeve, and the second bearing seat in sequence, the rotary joint is disposed at a second end of the roll core, the composite roll sleeve is connected to the roll core and rotates synchronously with the roll core, the roll core and the composite roll sleeve form an enclosed space, and the enclosed space is provided with circulating cooling water; M metal components of the composite roll sleeve are arranged in N layers in an alternating manner along a circumferential direction of the composite roll sleeve, and a spatial metallurgical bonding composite interface is present between adjacent metal components.

8. The casting-rolling apparatus for the casting-rolling method based on the multi-layer heterogeneous composite roll sleeve according to claim 7, wherein a shape of the composite interface is one or more of sine, cosine, spline, rectangular, triangular, or arc.

9. The casting-rolling apparatus for the casting-rolling method based on the multi-layer heterogeneous composite roll sleeve according to claim 7, wherein a high-temperature-resistant ceramic coating is provided on an outermost side of the composite roll sleeve.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG. 1 is a structural schematic view of a high-speed casting-rolling apparatus based on a multi-layer heterogeneous composite roll sleeve of the present disclosure;

[0029] FIG. 2 is a structural schematic view of a casting-rolling mill set of the high-speed casting-rolling apparatus based on the multi-layer heterogeneous composite roll sleeve of the present disclosure;

[0030] FIG. 3 is an axial sectional view of a composite roll sleeve with an axial spatial composite interface in the high-speed casting-rolling apparatus based on the multi-layer heterogeneous composite roll sleeve of the present disclosure;

[0031] FIG. 4 is a radial sectional view of a composite roll sleeve with a radial spatial composite interface in the high-speed casting-rolling apparatus based on the multi-layer heterogeneous composite roll sleeve of the present disclosure;

[0032] FIG. 5 is a sectional view showing variation of metal component layer in the compsite roll sleeve of the high-speed casting-rolling apparatus based on the multi-layer heterogeneous composite roll sleeve of the present disclosure along the axial direction;

[0033] FIG. 6 is a schematic view of traditional monometallic metal casting-rolling heat transfer;

[0034] FIG. 7 is a schematic view of the monometallic metal casting-rolling heat transfer of the high-speed casting-rolling apparatus based on the multi-layer heterogeneous composite roll sleeve of the present disclosure;

[0035] FIG. 8 is a schematic view of traditional solid-liquid casting-rolling composite heat transfer;

[0036] FIG. 9 is a schematic view of solid-liquid casting-rolling composite heat transfer of the high-speed casting-rolling apparatus based on the multi-layer heterogeneous composite roll sleeve of the present disclosure.

[0037] Reference numbers are listed as follows: [0038] 1. main drive system; 2. main frame; 3. position control system; 4. pouring system; 5. casting-rolling mill set; 501. roll core; 502. first bearing seat; 503. composite roll sleeve; 5031. first metal component; 5032. second metal component; 504. second bearing seat; 505. rotary joint; 6. uncoiling device.

DETAILED DESCRIPTION

[0039] To elaborate the technical content, objectives, and effects of the present disclosure, a detailed description will be provided in conjunction with the accompanying figures of the present disclosure.

[0040] A high-speed casting-rolling apparatus based on a multi-layer heterogeneous composite roll sleeve of the present disclosure, as shown in FIG. 1, includes a main drive system 1, a main frame 2, a position control system 3, a pouring system 4, a casting-rolling mill set 5, and an uncoiling device 6. An output shaft of the main drive system 1 is connected to a first end of the roll core 501 of the casting-rolling mill set 5 via a coupling part. The main drive system 1 drives rotation of the roll core 501. The casting-rolling mill set 5 is disposed at a first end of the main frame 2. The position control system 3 is disposed at a second end of the main frame 2 and is connected to the casting-rolling mill set 5. The position control system 3 is used to adjust a roll gap between the two casting-rolling mill sets 5, enabling the production of strips at different dimensions. The uncoiling device 6 is disposed at a third end of the main frame 2 and is used to uniformly unwind and feed a coiled solid base metal into the casting-rolling mill set 5. The main frame 2 is configured to bear the entire rolling force. The pouring system 4 is disposed at an end of the uncoiling device 6 and is used for pouring liquid metal.

[0041] Furthermore, the casting-rolling mill set 5 may be disposed at the first end of the main frame 2 in a horizontal, inclined, or vertical manner. The uncoiling device 6 may be configured in one or more sets to achieve unwinding of solid base metal strips of the same or different types.

[0042] As shown in FIG. 2, the casting-rolling mill set 5 mainly includes a roll core 501, a first bearing seat 502, a composite roll sleeve 503, a second bearing seat 504, and a rotary joint 505. The roll core 501 extends axially through the first bearing seat 502, the composite roll sleeve 503, and the second bearing seat 504 in sequence. The rotary joint 505 is disposed at the second end of the roll core 501. The composite roll sleeve 503 is connected to the roll core 501 and rotates synchronously with the roll core 501. The roll core 501 and the composite roll sleeve 503 form an enclosed space. Cooling water introduced through the rotary joint 505 flows into the enclosed space to provide cooling during the casting-rolling process.

[0043] The composite roll sleeve 503 includes M metal components, which are arranged in N layers along a circumferential direction to form a multi-layer heterogeneous composite roll sleeve, where MN3M, and both M and N are positive integers. The term multi-layer heterogeneous means that multiple different metal components are arranged in N layers. In specific embodiments, a common arrangement is two metal components alternately arranged in two layers. A macroscopic or microscopic spatial metallurgical bonding composite interface is formed between adjacent metal components. A shape of the composite interface may be one or more of sine, cosine, spline, rectangular, triangular, or arc. In other embodiments, it may also be smooth or corrugated. An outermost side of the composite roll sleeve 503 includes a high-temperature-resistant ceramic coating with thermal shock resistance, thermal conductivity, and wear resistance, which directly contacts the solid-liquid metal material during the casting-rolling process. A layer thickness of the M metal components may be uniform or variable along a radial direction, that is, the layer thickness at different positions along the radial direction may be the same or different. As shown in FIG. 5, the layer thickness determines the heat transfer capability of the composite roll sleeve 503. Establishing a composite roll sleeve 503 with different layer thicknesses along the radial direction can adjust the heat transfer capability of the composite roll sleeve 503 at different radial positions. This can achieve uniform cooling of the strip in a width direction, thereby improving the uniformity of microstructural properties and enhancing the forming quality of the strip.

[0044] In a preferred embodiment, M is 2, and the M metal components are respectively a first metal component 5031 and a second metal component 5032. The first metal component 5031 is a copper alloy, and the second metal component 5032 is a steel alloy. A layer thickness of the first metal component 5031 and the second metal component 5032 in the radial direction may be consistent or varied according to actual needs. An axial sectional view of the composite roll sleeve with an axial spatial composite interface is shown in FIG. 3, and a radial sectional view of the composite roll sleeve with a radial spatial composite interface is shown in FIG. 4.

[0045] The schematic view of a traditional monometallic metal casting-rolling heat transfer is shown in FIG. 6. A casting-rolling zone mainly includes an inlet 100, a monometallic metal 101, a left casting-rolling roll 102, a right casting-rolling roll 103, a cooling water 106, and an outlet 105. Traditional monometallic metal casting-rolling is described as pouring monometallic metal between the two casting-rolling rolls to form a melt pool. Under a rapid solidification and rolling deformation action of the roll sleeve, the liquid monometallic metal solidifies and deforms to be a monometallic metal strip. Thermal resistance is an important factor affecting the cooling and solidification speed of the monometallic metals. The thermal resistance in the traditional monometallic metal casting-rolling heat transfer mainly includes thermal resistance between circulating cooling water inside the casting-rolling roll and the roll sleeve, thermal resistance within the roll sleeve during heat transfer, thermal resistance between the roll sleeve and the solidifying shell, and thermal resistance between the solidifying shell and the liquid metal in the heat transferring process.

[0046] The schematic view of monometallic metal casting-rolling heat transfer of a high-speed casting-rolling apparatus based on a multi-layer heterogeneous composite roll sleeve is shown in FIG. 7. The casting-rolling zone mainly includes an inlet 100, a monometallic metal 101, a left copper roll sleeve 111, a left steel roll sleeve 112, a right copper roll sleeve 113, a right steel roll sleeve 114, a cooling water 106, and an outlet 105. Unlike the traditional monometallic metal casting-rolling, the monometallic metal casting-rolling using a multi-layer heterogeneous composite roll sleeve employs a composite roll sleeve 503 based on the original process of the traditional monometallic metal casting-rolling. The thermal resistance in the monometallic metal casting-rolling heat transfer of the high-speed casting-rolling device based on the multi-layer heterogeneous composite roll sleeve includes thermal resistance between the circulating cooling water inside the casting-rolling roll and the roll sleeve, thermal resistance between the roll sleeve and the solidifying shell, and thermal resistance between the solidifying shell and the liquid metal. The thermal resistance during heat transfer within the composite roll sleeve is no longer singular, but become the thermal resistance during heat transfer within the first metal component 5031, the thermal resistance during heat transfer within the second metal component 5032, and the thermal resistance between the first metal component 5031 and the second metal component 5032. By designing the layer thickness of the first metal component 5031 and the second metal component 5032 in the two composite roll sleeves 503, the cooling and solidification speed of the monometallic metal can be changed.

[0047] The schematic view of traditional solid-liquid casting-rolling heat transfer is shown in FIG. 8. The solid-liquid casting-rolling zone mainly includes an inlet 100, a base metal 121, a cladding metal 122, a left casting-rolling roll 123, a right casting-rolling roll 124, a cooling water 106, and an outlet 105. In the traditional solid-liquid casting-rolling process, the solid base metal is fed into the solid-liquid casting-rolling zone enclosed by two roll sleeves through the uncoiling device 6 on one side, and the liquid cladding metal enters the solid-liquid casting-rolling zone from the pouring system on the other side. Under the asymmetric rapid solidification and rolling deformation action of the two roll sleeves, the liquid cladding metal solidifies and deforms to form a metallurgical bond with the solid base metal, resulting in a layered metal composite material. The heat transfer in the traditional solid-liquid casting-rolling composite processes is asymmetric. The thermal resistance on the left side of the solid-liquid casting-rolling composite mainly includes the thermal resistance between the circulating cooling water inside the casting-rolling roll and the roll sleeve, the thermal resistance during heat transfer within the roll sleeve metal, the thermal resistance between the roll sleeve and the solidifying shell, and the thermal resistance between the solidifying shell and the liquid cladding metal. The thermal resistance on the right side of the solid-liquid casting-rolling composite mainly includes the thermal resistance between the circulating cooling water inside the casting-rolling roll and the roll sleeve, the thermal resistance during heat transfer within the roll sleeve metal, the thermal resistance between the roll sleeve and the solid base metal, the thermal resistance between the solid base metal and the solidifying shell, and the thermal resistance between the solidifying shell and the liquid cladding metal.

[0048] The schematic view of a solid-liquid casting-rolling composite heat transfer of the high-speed casting-rolling apparatus based on a multi-layer heterogeneous composite roll sleeve is shown in FIG. 9. The solid-liquid casting-rolling zone mainly includes an inlet 100, a base metal 121, a cladding metal 122, a left copper roll sleeve 131, a left steel roll sleeve 132, a right copper roll sleeve 133, a right steel roll sleeve 134, a cooling water 106, and an outlet 105. Unlike the traditional solid-liquid casting-rolling composite process, the solid-liquid casting-rolling composite of the high-speed casting-rolling device based on the multi-layer heterogeneous composite roll sleeve employs a composite roll sleeve 503 based on the original process of traditional solid-liquid casting-rolling composite process. Based on the analysis of the heat transfer thermal resistance path, the thermal resistance in heat transfer during solid-liquid casting-rolling composite of the high-speed casting-rolling device of the multi-layer heterogeneous composite roll sleeve includes the thermal resistance between the circulating cooling water inside the casting-rolling roll and the roll sleeve, the thermal resistance during heat transfer within the roll sleeve metal, the thermal resistance between the roll sleeve and the solidifying shell, the thermal resistance between the solidifying shell and the liquid cladding metal, the thermal resistance between the roll sleeve and the solid base metal, and the thermal resistance between the solid base metal and the solidifying shell. The thermal resistance during heat transfer within the composite roll sleeve is no longer singular, but become the thermal resistance during heat transfer within the first metal component 5031, the thermal resistance during heat transfer within the second metal component 5032, and the thermal resistance between the first metal component 5031 and the second metal component 5032. By designing the layer thickness of the first metal component 5031 and the second metal component 5032 in the two composite roll sleeves 503, the cooling and solidification speed of the layered metal can be changed, thereby solving the problem of asymmetric heat transfer, achieving uniform cooling of the strip in the thickness direction, and improving the uniformity of microstructural properties.

[0049] Hereinafter, the casting-rolling method for the high-speed casting-rolling apparatus based on the multi-layer heterogeneous composite roll sleeve of the present disclosure will be described. The casting-rolling method includes following steps: [0050] S1, determining structural parameters and process parameters for casting-rolling of the target metal, and determining a combination mode of the N-layer arrangement of the M metal components in the composite roll sleeve 503, analyzing the heat transfer thermal resistance path, and separately determining layer thickness of the metal components of a plurality of composite roll sleeves 503 based on the solidification temperature range, the target solidification point position, and the offset of the solidification point position in asymmetric heat transfer of the target metal. In this embodiment, the number of composite roll sleeves 503 is two. [0051] S2, preparing the composite roll sleeve 503 according to the combination mode and layer thickness of the first metal component 5031 and the second metal component 5032 as determined in step S1, in which a macroscopic or microscopic spatial composite interface is formed between the first metal component 5031 and the second metal component 5032, which achieves metallurgical bonding, assembling the composite roll sleeve 503 with the casting-rolling mill set 5 to complete the overall operation debugging of the casting-rolling apparatus. [0052] S3, flowing the target metal from the pouring system 4 into the casting-rolling zone enclosed by the two composite roll sleeves 503, in which under the rapid solidification and rolling deformation action of the two composite roll sleeves 503, the solidification point is at the target center positio, after solidification and deformation, the target metal becomes a target metal product with the desired microstructure and properties. [0053] S4, feeding the target metal product, after cutting off the head, into a coiler for winding and then packaged and stored.

[0054] Furthermore, in step S3, when the target metal is a monometallic metal, liquid monometallic metal flows from the pouring system 4 into the casting-rolling zone enclosed by the two composite roll sleeves 503. Under the rapid solidification and rolling deformation action of the two composite roll sleeves 503, the solidification point is at the target center position. After solidification and deformation, the liquid monometallic metal becomes a monometallic metal strip with the desired microstructure and properties.

[0055] Furthermore, in step S3, when the target metal is a layered metal composite material, the solid base metal is first fed into the solid-liquid casting-rolling zone enclosed by the two composite roll sleeves 503 through the uncoiling device 6. The liquid cladding metal enters the solid-liquid casting-rolling zone from the pouring system 4. Under the asymmetric rapid solidification and rolling deformation action of the two composite roll sleeves 503, the solidification point is at the target center position. After solidification and deformation, the liquid cladding metal forms a metallurgical bond with the solid base metal to produce a layered metal composite material with the desired microstructure and properties.

[0056] Furthermore, when two uncoiling devices 6 are used to unwind and feed two identical or different base metal strips into the solid-liquid casting-rolling zone enclosed by the two composite roll sleeves 503, the same uniform heat transfer in the width and thickness directions of the strip can be achieved by designing the combination mode and layer thickness of the metal components in the two composite roll sleeves 503. This can improve the forming speed and efficiency. The composite roll sleeve 503 mainly withstands the positive pressure and tangential frictional force. The locking effect of the macroscopic or microscopic spatial composite interface can significantly enhance the resistance to shearing and slippage.

[0057] The embodiments described above are merely illustrative of preferred embodiments of the present disclosure and are not intended to limit the scope of the present disclosure. Any modifications and improvements made by a person skilled in the art to the technical solutions of the present disclosure, without departing from the spirit of the present disclosure, should fall within the scope of protection defined by the claims of the present disclosure.