Rolling equipment and rolling method for coated metal composite plate

Abstract

The invention discloses rolling equipment and a rolling method for a coated metal composite plate, relates to the technical field of coated metal composite plate preparation, and aims to solve the problems of cracking and poor stability caused by incomplete edge closing and low interface bonding strength of a metal composite plate prepared at present. The rolling equipment comprises a three-roller skew rolling mill set, a special-shaped rolling mill and a plurality of rolling mill sets. The three-roller skew rolling unit is used for rolling the metal composite rod; the special-shaped rolling mill is arranged on the downstream portion of the three-roller skew rolling mill set, and the working roller face of the special-shaped rolling mill is provided with an inwards-concave roller face used for pre-rolling the metal composite rod into the oval section. The multiple rolling units are sequentially arranged on the downstream of the three-roller skew rolling unit in the rolling direction, each rolling unit comprises a first two-roller rolling mill and a second two-roller rolling mill, the first two-roller rolling mills roll metal composite bars into coated metal composite plates through a first rolling plane, the second two-roller rolling mills roll and shape side edges through a second rolling plane, and the first rolling plane and the second rolling plane are parallel to each other. The first rolling plane is perpendicular to the second rolling plane.

Description

Technical Field

[0001] The present invention relates to the technical field of the preparation of clad metal composite plates, and particularly relates to a rolling device and a rolling method for clad metal composite plates. Background Art

[0002] Due to its excellent abrasion resistance, corrosion resistance, oxidation resistance, light weight, high specific strength, shock absorption and noise reduction, electromagnetic properties and other advantages, metal composite plates are widely used in the fields of petroleum, chemical industry, electric power, transportation, aerospace and so on. At present, the preparation methods of metal composite plates mainly include direct rolling method, explosion + rolling method, sintering method, casting and rolling composite method, reverse solidification method, electromagnetic continuous casting composite method and so on. These methods have their own advantages, and the appropriate preparation method can be selected according to the specific types, specifications and sizes of metal composite plates to meet diverse application requirements. However, the bonding interfaces will be exposed at the edges of the metal composite plates prepared by these methods, which to a certain extent limits their application in environments with strong corrosion and severe oxidation. At the same time, the open interfaces at the edges are prone to cracking, thus reducing the stability of the composite plates. Therefore, the protection of the edge interfaces of the composite plates is extremely urgent. The clad metal composite plate uses material A to completely wrap material B therein, effectively avoiding the exposure of the edge interfaces, thereby significantly improving the stability and safety of the composite plates, and showing broad application prospects and promotion value. However, improving the interfacial bonding strength of clad metal composite plates and developing efficient and reliable preparation technologies are still problems that need to be urgently solved in the industry.

[0003] An existing production process of a clad metal composite plate is to continuously extrude metal A into a core blank, and continuously deform metal B into a clad blank, longitudinally wrap the metal A core blank to form a composite blank. After the composite blank is formed by a mold and continuously reduced in diameter, it is finally rolled at an isothermal state to obtain a clad metal composite plate. This production process is only suitable for preparing clad metal composite plates with thin outer layers and easy deformation, and it is difficult to prepare clad metal composite plates with high melting points, high strength and thick outer wall thicknesses. Moreover, due to the high temperature of isothermal rolling, a large amount of intermetallic compounds are generated at the interface, thereby reducing the interfacial bonding strength and being prone to cracking, resulting in incomplete closure of the clad metal composite plate. Summary of the Invention

[0004] The purpose of the present invention is to provide a rolling device and a rolling method for clad metal composite plates, which are used to solve the problems of incomplete closure at the edges of metal composite plates, cracking and poor stability caused by low interfacial bonding strength.

[0005] To achieve the above purpose, in the first aspect, the present invention provides a rolling device for clad composite plates, including: A three-roll skew rolling mill, which is used to roll a metal composite bar blank into a metal composite bar; The profiled roll mill is arranged downstream of the three-roll skew rolling mill set. The working roll surface of the profiled roll mill has a concave roll surface for pre-rolling the metal composite rod into an elliptical cross-section. Multiple sets of rolling mills are arranged downstream of the profiled roll mill in sequence along the rolling direction. Each set of rolling mills includes a first two-roll mill and a second two-roll mill. The first two-roll mill rolls the metal composite rod into a clad metal composite plate through a first rolling plane, and the second two-roll mill rolls and shapes the side shape of the clad metal composite plate through a second rolling plane. The first rolling plane and the second rolling plane are perpendicular.

[0006] Compared with the prior art, for the rolling equipment of the clad metal composite plate provided by the present invention, when rolling the clad metal composite plate, first, the metal composite rod blank is placed into the three-roll skew rolling mill set. The metal composite rod blank forms a metallurgical bonding layer at the composite interface under the rolling of the three-roll skew rolling mill set to obtain a metal composite rod. Subsequently, the metal composite rod enters the profiled roll mill, and the concave roll surface of its working roll surface pre-rolls the metal composite rod to obtain a metal composite rod with an elliptical cross-section, and the dimension in the width direction of the metal composite rod is increased, avoiding edge stress concentration when directly rolled into a plate shape. Then the metal composite rod enters the rolling mill set, and is rolled on two mutually perpendicular planes by the first two-roll mill and the second two-roll mill in the rolling mill set respectively. The first two-roll mill reduces its thickness along the first rolling plane to the target size, and then enters the second two-roll mill. The second two-roll mill applies a lateral extrusion force to both sides of it along the second rolling plane, so that the outer layer metal wraps towards the center and closes the edge interface. Finally, the obtained clad metal composite plate is subjected to cyclic rolling through multiple sets of rolling mills to obtain a clad metal composite plate with the target thickness. In this way, through the collaborative operations of three-roll skew rolling interface bonding, profiled pre-rolling to disperse stress, lateral extrusion to close the edge, and multi-pass cyclic rolling to strengthen the interface on the metal composite rod blank, a clad metal composite plate with good edge closure and high interface bonding strength is obtained, reducing the cracking rate of the clad metal composite plate and improving the stability of the clad metal composite plate. And compared with the existing method of continuously deforming the clad blank and longitudinally wrapping it outside the core blank, then connecting the butt joint of the clad blank, and finally rolling it into a clad metal composite plate, the present application rolls the metal composite rod obtained by rolling through the three-roll skew rolling mill set to obtain a clad metal composite plate, which can be not limited to the thickness of the clad blank and whether it is easy to bend and deform, and has a wider applicability.

[0007] Optionally, in the above-mentioned rolling equipment of the clad metal composite plate, the concave roll surface of the profiled roll mill is a concave arc roll surface, and the ratio of the radius of curvature of the concave arc roll surface to the radius of the metal composite rod is greater than or equal to 1.05 and less than or equal to 1.80.

[0008] Optionally, in the rolling equipment for the clad metal composite plate described above, a profiled roll mill is further provided between two adjacent rolling mill units.

[0009] Optionally, in the rolling equipment for the clad metal composite plate described above, the radius of curvature of the concave roll surfaces of multiple profiled roll mills gradually increases along the conveying direction of the metal composite rod.

[0010] Optionally, in the rolling equipment for the clad metal composite plate described above, the rolling equipment for the clad metal composite plate further includes a temperature control device, and the temperature control device is arranged between the three-roll skew rolling mill unit and the profiled roll mill; and / or, the temperature control device is arranged between two adjacent rolling mill units.

[0011] Optionally, in the rolling equipment for the clad metal composite plate described above, the temperature control device includes a frame body, an alternating current power supply, and an induction coil. The alternating current power supply and the induction coil are arranged on the frame body, and the induction coil is electrically connected to the alternating current power supply. The induction coil is used to heat the metal composite rod by surrounding it; and / or, the temperature control device includes a box body and a gas cooling device. The gas cooling device is arranged on the box body and is used to introduce cooling gas into the box body to cool the metal composite rod; and / or, the temperature control device includes a box body and a water spraying cooling device. The water spraying cooling device is arranged on the box body and is used to spray cooling water into the box body to cool the metal composite rod.

[0012] In a second aspect, the present invention provides a rolling method for a clad metal composite plate. Using any of the above rolling equipment for the clad metal composite plate, the rolling method includes the following steps: S100: Provide a metal composite rod blank; S200: Roll and composite the metal composite rod blank through a three-roll skew rolling mill unit to obtain a metal composite rod; S300: Feed the metal composite rod into a profiled roll mill for profiled pre-rolling to obtain a metal composite rod with an elliptical cross-section; S400: Feed the metal composite rod into a rolling mill unit and roll it along a first rolling plane and a second rolling plane respectively to obtain a clad metal composite plate; wherein, the first rolling plane and the second rolling plane are perpendicular; S500: Repeat step S400 until a clad metal composite plate with a target thickness is obtained.

[0013] Compared with the prior art, in the rolling method of the coated metal composite plate provided by the present invention, when preparing the coated metal composite plate, first, select metal materials and combine them into a metal composite bar blank; then send the metal composite bar blank into a three-roll skew rolling mill. The three rolls are arranged at a specific inclination angle. Through the radial pressure and axial friction force, the metal composite bar blank undergoes plastic deformation, and atomic diffusion forms a metallurgical bonding layer to obtain a combined metal composite bar; subsequently, transfer the metal composite bar to a profiled roll mill. Under the friction force and rolling force, the metal composite bar is rolled into an elliptical cross-section, increasing the width dimension and changing the internal stress distribution to avoid stress concentration at the edge during subsequent rolling; then send the elliptical metal composite bar into a rolling mill for rolling on the first rolling plane and the second rolling plane. First, roll to make the bar extend in the width direction and reduce the thickness. Then apply a lateral extrusion force to its side along a plane perpendicular to the previous rolling plane, so that the outer layer metal wraps towards the center and closes the edge interface to obtain a coated metal composite plate. Finally, repeat the rolling of two mutually perpendicular planes, and precisely control the reduction amount each time, so that the thickness of the coated metal composite plate is gradually reduced to the target size. With such a setting, the metallurgical bonding layer formed by the three-roll skew rolling mill improves the composite quality, the profiled pre-rolling optimizes the rolling transition and reduces stress concentration at the edge. The cooperation of two mutually perpendicular rolling planes can effectively reduce the thickness of the plate while ensuring good closure of the edge interface. Multiple cycles of rolling ensure the dimensional accuracy and quality of the plate. Compared with the existing method of continuously deforming the coated blank and longitudinally wrapping it outside the core blank, then connecting the butt joints of the coated blank, and finally rolling it into a coated metal composite plate, the coated metal composite plate obtained by rolling the metal composite bar rolled by the three-roll skew rolling mill in this application is not limited by the thickness of the coated blank and its ease of bending deformation, and has a wider applicability.

[0014] Optionally, in the above rolling method of the coated composite plate, after rolling and combining the metal composite bar blank through a three-roll skew rolling mill to obtain a metal composite bar, before sending the metal composite bar into a profiled roll mill for profiled pre-rolling to obtain a metal composite bar with an elliptical cross-section, the rolling method further includes: controlling the temperature of the metal composite bar.

[0015] Optionally, in the above rolling method of the coated composite plate, sending the metal composite bar into a profiled roll mill for profiled pre-rolling includes: sending the metal composite bar into a profiled roll mill and passing it through the profiled roll mill for profiled pre-rolling at a rolling speed greater than or equal to 3 m / min and less than or equal to 8 m / min.

[0016] Optionally, in the rolling method of the above-mentioned coated composite plate, feeding the metal composite rod into the rolling mill and rolling it along the first rolling plane and the second rolling plane respectively to obtain the coated metal composite plate includes: feeding the metal composite rod into the rolling mill, and successively performing horizontal rolling and vertical rolling for shaping to obtain the coated metal composite plate. Description of the Drawings

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings: Figure 1 It is a schematic diagram of the overall structure of a rolling equipment for a coated metal composite plate proposed in an embodiment of the present invention; Figure 2 It is a simplified structural diagram of a rolling equipment for a coated metal composite plate proposed in an embodiment of the present invention; Figure 3 It is a schematic diagram of the structure of a special-shaped roll mill of a rolling equipment for a coated metal composite plate proposed in an embodiment of the present invention; Figure 4 It is a schematic diagram of the structure of a special-shaped roll of a rolling equipment for a coated metal composite plate proposed in an embodiment of the present invention; Figure 5 It is a deformation schematic diagram of a coated metal composite plate of a rolling equipment for a coated metal composite plate proposed in an embodiment of the present invention; Figure 6 It is a relationship schematic diagram between the coated metal composite plates of different cyclic rolling groups and the special-shaped rolls of a rolling equipment for a coated metal composite plate proposed in an embodiment of the present invention; Figure 7 It is a flow chart of a rolling method for a coated metal composite plate proposed in an embodiment of the present invention.

[0018] Reference numerals: 1 is a three-roll skew rolling mill group, 2 is a cooling module, 3 is a heating module, 4 is a special-shaped roll mill, 41 is a coupling, 42 is a bearing seat, 43 is a special-shaped roll, 5 is a first two-roll mill, and 6 is a second two-roll mill. Detailed Embodiments

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0021] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined. "Several" means one or more unless otherwise specifically defined.

[0022] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the present invention.

[0023] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Please refer to Figure 1 or Figure 2 , the rolling equipment for the coated metal composite plate provided by the embodiment of the present invention includes: a three-roll skew rolling mill, a profiled roll mill, and multiple groups of rolling mills; wherein, the three-roll skew rolling mill is used to roll the metal composite billet into a metal composite rod; the profiled roll mill is disposed downstream of the three-roll skew rolling mill, and the working roll surface of the profiled roll mill has a concave roll surface for pre-rolling the metal composite rod into an oval cross-section; multiple groups of rolling mills are sequentially disposed downstream of the three-roll skew rolling mill along the rolling direction, and each group of rolling mills includes a first two-high rolling mill and a second two-high rolling mill. The first two-high rolling mill is used to roll the metal composite rod along the first rolling plane, and the second two-high rolling mill is used to roll and shape the side shape of the coated metal composite plate along the second rolling plane. The rolling planes of the second two-high rolling mill and the first two-high rolling mill are perpendicular.

[0025] It should be noted that the metal composite bar blank is composed of heterogeneous metal materials, specifically including a core layer and a cladding layer nested coaxially. The core layer is a solid metal core bar, the cladding layer is a hollow tubular metal cladding tube, and the initial cross-section of the metal composite bar blank is a circular cross-section.

[0026] During specific implementation: Please refer to Figure 1 , during the rolling of the clad metal composite plate, first, the metal composite bar blank is placed into the three-roll skew rolling mill 1. The atomic diffusion at the composite interface of the metal composite bar blank forms a metallurgical bonding layer under the rolling of the three-roll skew rolling mill 1, obtaining a metal composite bar. Subsequently, the metal composite bar enters the profiled roll mill 4, and the concave roll surface of its working roll surface pre-rolls the metal composite bar, obtaining a metal composite bar with an elliptical cross-section. The dimension in the width direction of the metal composite bar increases, avoiding edge stress concentration when directly rolled into a plate shape. Then, the metal composite bar enters the rolling mill unit, and is respectively rolled on two mutually perpendicular planes by the first two-high rolling mill 5 and the second two-high rolling mill 6 in the rolling mill unit. The first two-high rolling mill 5 rolls it through the first rolling plane to reduce the thickness to the target dimension, and then enters the second two-high rolling mill 6. The second two-high rolling mill 6 applies a lateral extrusion force to both sides of it through the second rolling plane rolling, so that the outer layer metal wraps towards the center and closes the edge interface. Finally, the obtained clad metal composite plate is subjected to cyclic rolling by multiple groups of rolling mill units. Among them, as Figure 5 shown, Figure 5 the part within the dotted line frame in

[0027] is the process of multiple groups of cyclic rolling, and the arrow is the direction of cyclic rolling, obtaining a clad metal composite plate with the target thickness. In this way, through the coordinated operations of three-roll skew rolling interface bonding, profiled pre-rolling to disperse stress, lateral extrusion to close the edge, and multi-pass cyclic rolling to strengthen the interface of the metal composite bar blank, a clad metal composite plate with good edge closure and high interface bonding strength is obtained, reducing the cracking rate of the clad metal composite plate and improving the stability of the clad metal composite plate. And compared with the existing method of continuously deforming the clad blank and longitudinally wrapping it outside the core blank, then connecting the butt joints of the clad blank, and finally rolling it into a clad metal composite plate, the clad metal composite plate obtained by rolling the metal composite bar obtained by rolling through the three-roll skew rolling mill in this application can be not limited to the thickness of the clad blank and whether it is easy to bend and deform, and has a wider applicability. Figure 3 and Figure 6 , the concave roll surface of the profiled roll mill 4 is a concave arc roll surface, and the ratio of the radius of curvature of the concave arc roll surface to the radius of the metal composite bar is greater than or equal to 1.05 and less than or equal to 1.80.

[0028] During specific implementation, after the metal composite bar is preliminarily compounded by the three-roll skew rolling mill 1, it is transferred to the profiled roll mill 4 of the first group of circulating rolling mills. At this time, the metal composite bar contacts the concave arc-shaped roll surface of the profiled roll mill 4 and enters the profiled roll mill 4. The curvature radius of the concave arc-shaped roll surface of the profiled roll mill 4 is set to be 1.05 - 1.80 times the radius of the metal composite bar, that is, the curvature radius of the concave arc-shaped roll surface can be 1.05 times, 1.10 times, 1.20 times, 1.30 times, 1.40 times, 1.80 times, etc., any multiple between 1.05 - 1.80 times the radius of the metal bar. This ratio range ensures that when the roll surface contacts the bar, the roll surface can provide sufficient friction to achieve stable biting, and at the same time avoids insufficient surface pressure caused by too small curvature or insufficient ovalization caused by too large curvature. After the metal composite bar completes the initial ovalization deformation in the profiled roll mill 4, it enters the adjacent rolling mill along the rolling line for rolling, and then its side is rolled and shaped. With such a setting, the curvature radius of the concave arc-shaped roll surface of the profiled roll mill 4 is precisely matched with the radius of the metal composite bar, ensuring a certain friction between the roll surface and the metal composite bar, while also avoiding insufficient biting force caused by too small curvature radius or insufficient deformation caused by too large curvature radius, guaranteeing the stability during the rolling process. And ovalizing the metal composite bar causes the metal composite bar to expand along its width direction, which can disperse the edge stress concentration during subsequent flat rolling or vertical rolling, reduce the stress peak value, lower the edge cracking rate, and improve the edge closing rate.

[0029] It should be noted that as Figure 6 shown, the direction indicated by the arrow is the rolling direction. In the case of having multiple groups of profiled roll mills 4, the ratio of the curvature radius of the concave arc-shaped roll surface to the radius of the metal composite bar between different groups gradually increases along the rolling direction. With such a setting, since the metal composite bar between different groups gradually ovalizes along the rolling direction, the gradually increasing radius ratio enables the concave arc-shaped roll surface to provide sufficient friction to achieve stable biting of the metal composite bar, and also avoids insufficient biting force caused by too small curvature radius or insufficient deformation caused by too large curvature radius, guaranteeing the stability during the rolling process.

[0030] As a possible implementation manner, the rolling equipment for the coated metal composite plate further includes at least one profiled roll mill 4, and at least one profiled roll mill 4 is arranged between any two adjacent rolling mills.

[0031] In specific implementation, after the metal composite bar is preliminarily rolled by the front set of rolling mills, it is transferred to the profiled roll mill 4 between adjacent rolling mills. At this time, the concave arc-shaped roll surface of the additional profiled roll mill 4 contacts the metal composite bar. As the profiled rolls of the profiled roll mill 4 rotate, the metal composite bar is bitten and rolled. The metal composite bar after being rolled by the profiled roll mill 4 forms an elliptical cross-section. In this way, through the series arrangement of multiple profiled roll mills 4, the metal composite bar can be subjected to staged ovalization deformation between adjacent rolling processes. After the initial rolling, the profiled roll mill 4 processes the bar stock, and then enters the next set of rolling mills for deformation rolling. With such a setting, after multiple passes of profiled transition of the metal composite bar, the extension amount in the width direction is accurately controlled within a certain range during each rolling, avoiding stress concentration caused by large deformation in a single time. The progressive deformation mechanism of the multi-stage profiled roll mill 4 makes the shape transition of the metal composite bar between adjacent rolling mills smoother, effectively disperses the stress peak during edge rolling, and further reduces the edge cracking rate. Among them, at least one profiled roll mill 4 is arranged between any two adjacent rolling mills, which means that no matter which two adjacent rolling mills they are, a profiled roll mill 4 can be arranged between them. Among them, the rolling equipment for the clad metal composite plate further includes at least one profiled roll mill 4, which means that in addition to there being a profiled roll mill 4 between the three-roll skew rolling mill and the nearest set of rolling mills, there is at least one profiled roll mill 4 between any adjacent rolling mills. It should be noted that the number of profiled roll mills 4 between each adjacent set of rolling mills can be one, or two or more profiled roll mills 4 can be set according to actual production requirements to better realize the processing of the metal composite bar between adjacent rolling mills and ensure the smooth progress of the rolling process and the improvement of product quality.

[0032] In some embodiments, the profiled roll mill 4 includes a coupling 41, a bearing block 42, and a profiled roll 43. In the profiled roll mill 4, the coupling 42 connects the driving motor and the shaft of the profiled roll 43, and the bearing blocks 42 are located at both ends of the profiled roll 43 to support the shaft of the profiled roll 43 and reduce friction and vibration.

[0033] Furthermore, the radius of curvature of the concave roll surface of the profiled roll mill 4 gradually increases along the rolling direction.

[0034] Specifically, after the metal composite bar undergoes initial rolling in the three-roll cross-rolling mill 1, it sequentially passes through the profiled rolling mills 4 arranged along the rolling line. The radius of curvature of the concave roll surface of the profiled rolling mills 4 gradually increases along the rolling direction, forming a gradient arrangement. The initial additional rolling mills utilize a relatively small radius of curvature to ensure high contact pressure between the roll surface and the metal composite bar, thereby achieving stable engagement and sufficient initial widthwise ductile deformation. As the rolling process progresses, the radius of curvature of the subsequent additional rolling mills gradually increases, gradually reducing the contact area between the roll surface and the bar and the contact pressure. This maintains the necessary deformation guidance while avoiding surface damage or internal stress concentration caused by excessive local pressure.

[0035] In practice, the metal composite bar first enters the additional mill with the smallest radius of curvature. Its concave roller surface closely adheres to the bar, achieving full expansion of the edge material through a large initial reduction. As the bar is transported forward to subsequent mills with progressively larger curvature radii, the arc length of contact between the roller surface and the bar gradually decreases, and the reduction per pass simultaneously decreases. Thus, during the initial rolling phase, the mill with a smaller radius of curvature, through the high-engaging force of the profiled roller mill 4, effectively eliminates surface defects in the metal composite bar and smoothly engages the bar, ensuring smooth process flow. Subsequent mills with larger radiuses of curvature reduce the pressure per unit area, resulting in a more uniform distribution of width extension deformation. The increasing radius of curvature optimizes the stress distribution at the composite interface, promoting metallurgical bonding strength at the composite interface and ultimately improving the mechanical properties of the composite plate.

[0036] As a possible implementation, see Figure 1 The rolling equipment of the clad metal composite plate also includes a temperature control device, which is arranged between the three-roller cross-rolling mill group 1 and the first group of rolling mills; and / or, is arranged between each adjacent group of rolling mills.

[0037] Specifically, the temperature control device can be arranged between the three-roller cross-rolling mill group 1 and the first group of rolling mills, so as to control the temperature of the material after preliminary processing by the three-roller cross-rolling mill group 1 before entering the first group of rolling mills, to ensure that it enters the subsequent rolling process at an appropriate temperature; or it can be arranged between each adjacent group of rolling mills. When the temperature of the material changes after passing through one group of rolling mills, a temperature control device is arranged between the adjacent mills, which can accurately control the temperature of the material before entering the next group of mills, to ensure that the material temperature is appropriate throughout the rolling process; both settings can also be used at the same time to adjust the temperature of the material at all times during the entire rolling process to ensure the stability of rolling.

[0038] Further, the temperature control device includes a frame body, an alternating current power supply, and an induction coil. The alternating current power supply and the induction coil are arranged on the frame body, and the induction coil is electrically connected to the alternating current power supply. The induction coil is used to surround the metal composite rod for heating; and / or, the temperature control device includes a box body and a gas cooling device. The gas cooling device is arranged on the box body and is used to introduce cooling gas into the box body to cool the metal composite rod; and / or, the temperature control device includes a box body and a water spraying cooling device. The water spraying cooling device is arranged on the box body and is used to spray cooling water to cool the periphery of the metal composite rod.

[0039] During specific implementation, when the metal composite rod reaches the induction coil area, the alternating current power supply electrically connected to it works to apply an alternating current to the induction coil. The alternating current passes through the induction coil, thereby generating an alternating magnetic field. Since the metal composite rod is within the alternating magnetic field, according to the principle of electromagnetic induction, an induced current is generated inside the metal composite rod. Coupled with the resistance existing in the metal composite rod itself, heat is generated on the metal composite rod. With such a setting, considering that the mechanical properties of different metal materials are different at different temperatures, heating the metal composite rod can improve the plasticity of the material, reduce its deformation resistance. When rolling some metals with higher hardness, heating to an appropriate temperature can make it more malleable, make the rolling process smoother, reduce equipment wear, and extend the service life. At the same time, using this method of heating with the induction coil and the alternating current power supply, the induction heating speed is fast, and the metal composite rod can be quickly heated to an appropriate rolling temperature, improving production efficiency.

[0040] In some embodiments, the temperature control device only includes a frame body, an alternating current power supply, and an induction coil. The alternating current power supply and the induction coil are arranged on the frame body, and the induction coil is electrically connected to the alternating current power supply. The induction coil is used to surround the metal composite rod for heating. When rolling some metals with higher hardness, heating to an appropriate temperature can make it more malleable, make the rolling process smoother, reduce equipment wear, and extend the service life.

[0041] In other embodiments, the temperature control device only includes a cooling device. The cooling device can have two different cooling forms. It can be that the temperature control device includes a box body and a gas cooling device, or the temperature control device includes a box body and a water spraying cooling device. With such a setting, when the temperature of the roll material is too high due to rolling friction, the cooling device can be operated to apply cooling water or cooling gas to the outer layer material to reduce the temperature and inhibit its thermal expansion amount.

[0042] As an embodiment, the temperature control device consists of a heating module 3, a cooling module 2 and a temperature sensor. Among them, the heating module 3 includes a frame, an alternating current power supply and an induction coil; the cooling module 2 includes a box body and a gas cooling device. The gas cooling device includes multiple groups of cooling nozzles that can independently adjust the ejection of the cooling medium. The cooling nozzles spray the cooling medium into the box body to cool the temperature of the metal composite rod passing through the box body. The temperature sensor can use an infrared thermometer to detect the temperature distribution on the surface and in the core of the metal composite rod in real time. Through the cooperation of the heating module 3 and the cooling module 2, and the real-time temperature monitoring of the temperature sensor, precise temperature control of the metal composite rod is achieved.

[0043] The cooling module 2 includes a box body and a water spraying cooling device. The water spraying cooling device includes multiple groups of nozzles that can independently adjust the water spraying amount. The nozzles spray cooling water into the box body to cool the temperature of the composite pipe passing through the box body. The temperature sensor can use an infrared thermometer to detect the temperature distribution on the surface and in the core of the composite pipe in real time. Through the cooperation of the induction heating module 3 and the water spraying cooling module 2, and the real-time temperature monitoring of the temperature sensor, precise temperature control of the composite pipe is achieved.

[0044] In some embodiments, the heating module 3 can also adopt multiple groups of heat radiation plates arranged in zones. The multiple groups of heat radiation plates arranged in zones are arranged along the transmission direction of the metal composite rod, and can perform heat radiation heating on different parts of the metal composite rod to further complete the precise regulation of the temperature of the metal composite rod. During specific implementation, when the metal composite rod is initially compounded by the three-roll skew rolling mill 1 and then transmitted to the temperature control device area. The temperature sensor determines the current temperature state of the metal composite rod according to the preset temperature value; if it is detected that the overall temperature of the metal composite rod is higher than the target threshold, the cooling module 2 is activated to spray the cooling medium (wherein the cooling medium can be liquid nitrogen, water coolant and other media) for cooling; if it is detected that the temperature of a certain local area of the metal composite rod is too low, the corresponding grouped heat radiation plate is activated to perform temperature compensation on it. At the same time, for some metal composite rods with a large difference in the thermal expansion coefficients of the inner and outer composite materials, the temperature control device can also adjust the temperature difference to achieve the expansion balance of the inner and outer materials to reduce the interfacial stress problem caused by the difference in the thermal expansion coefficients of different materials. Specifically, when the outer layer temperature of the metal composite rod is higher than the core due to frictional effects during the rolling process, the temperature control device performs temperature control based on the difference in the thermal expansion coefficients of the two materials. For the case where the thermal expansion coefficient of the outer layer material is higher than that of the core, the cooling module 2 is activated to apply the cooling medium to the outer layer material to reduce the temperature and suppress its thermal expansion amount, and at the same time apply radiant heat to the core to increase its thermal expansion amount, so that the expansion difference between the two tends to zero; conversely, if the thermal expansion coefficient of the core material is higher, the expansion balance is achieved by appropriately increasing the outer layer temperature.

[0045] In specific implementation, after the composite tube is initially formed by the three-roll skew rolling mill 1, it is transferred to the temperature control device area. The temperature sensor determines the current temperature state of the composite tube according to the preset temperature value; if it is detected that the overall temperature of the composite tube is higher than the target threshold, the water spray cooling module 2 is activated to spray cooling water for temperature reduction; if it is detected that the temperature of a certain local area of the composite tube is too low, the induction coil of the corresponding group is activated to warm it up. At the same time, for some composite tubes with a large difference in the thermal expansion coefficients of the inner and outer composite materials, the temperature control device can also adjust the temperature difference to achieve the expansion balance of the inner and outer materials to reduce the interfacial stress problem caused by the difference in the thermal expansion coefficients of different materials. Specifically, when the outer layer temperature of the composite tube is higher than the core due to friction during the rolling process, the temperature control device performs temperature control based on the difference in the thermal expansion coefficients of the two materials. For the case where the thermal expansion coefficient of the outer layer material is higher than the core, the water spray cooling module 2 is activated to apply cooling water to the outer layer material to reduce the temperature and inhibit its thermal expansion amount, while applying induction heating to the core to increase its thermal expansion amount, making the expansion difference between the two tend to zero; conversely, if the thermal expansion coefficient of the core material is higher, the expansion balance is achieved by appropriately increasing the outer layer temperature.

[0046] It should be noted that the output power of the alternating current power supply is adjustable and can be used for induction heating of different materials and different temperatures.

[0047] Furthermore, the center line of the induction coil coincides with the rolling center line, so that the metal composite rod is in the center position of the induction magnetic field during the rolling process, and thus each position of the metal composite rod is uniformly heated, ensuring that the plastic deformation of each part of the metal composite rod is consistent during rolling, avoiding rolling defects caused by local temperature differences, and thereby improving the quality of the finally manufactured clad metal composite plate. At the same time, it is also convenient for the metal composite rod to stably enter the induction coil, avoiding the interruption of the rolling process caused by errors, and improving the production efficiency.

[0048] In some embodiments, the number of rolling mills is four to eight groups. In specific implementation, the number of rolling mills is set to four to eight groups, which can be four groups, five groups, six groups, seven groups or eight groups, and are arranged in sequence along the rolling process. When the metal composite rod is initially compounded by the three-roll skew rolling mill 1, it successively enters the multi-stage rolling mills for progressive deformation. For some composite materials with higher requirements for interfacial bonding strength, more rolling mills are used to disperse the total deformation amount of the metal into multiple process stages by increasing the number of rolling passes, avoiding cracking caused by large reduction in a small number of passes. With such a setting, the elastic setting of the number of four to eight groups of rolling mills can adapt to the material characteristics of different metal combinations, and different numbers of rolling passes are used for metal materials with different hardnesses, improving the processing efficiency while ensuring that the materials do not crack.

[0049] The working principle of the rolling equipment for the coated metal composite plate provided by the embodiments of the present invention will be described below in a possible implementation manner, and specific limitations are not made here.

[0050] The working principle is as follows: First, the metal composite bar blank is placed into the three-roll skew rolling mill 1. Under the action of the three-roll skew rolling mill 1, atomic diffusion occurs at the composite interface of the metal composite bar blank, forming a metallurgical bonding layer, thereby obtaining a metal composite bar. Subsequently, the metal composite bar enters the profiled roll mill 4. The working roll surface of the profiled roll mill 4 is an inwardly concave arc-shaped roll surface, and the ratio of its curvature radius to the radius of the metal composite bar is between 1.05 and 1.20. Such a design enables sufficient friction to be provided for stable biting when the roll surface contacts the metal composite bar, and can ensure that the metal composite bar is rolled into an elliptical cross-section, increasing its dimension in the width direction, effectively avoiding edge stress concentration when directly rolled into a plate shape subsequently. Next, the metal composite bar pre-rolled by the profiled roll mill 4 enters the rolling mill unit. The rolling mill unit includes the first two-high rolling mill 5 and the second two-high rolling mill 6, and the rolling planes of the two are perpendicular to each other. The first two-high rolling mill 5 reduces the thickness of the metal composite bar to the target size through the first rolling plane, and then enters the second two-high rolling mill 6. The second two-high rolling mill 6 applies a lateral extrusion force to both sides of it through the second rolling plane, causing the outer layer metal to wrap towards the center and closing the edge interface. After that, the obtained coated metal composite plate will be subjected to cyclic rolling by multiple groups of rolling mill units to be further thinned to the target thickness. It should be noted that in the setting of the profiled roll mill 4, except for the profiled roll mill 4 between the three-roll skew rolling mill 1 and the first group of rolling mill units, at least one profiled roll mill 4 is set between any two adjacent groups of rolling mill units. The curvature radius of the inwardly concave roll surface of these profiled roll mills 4 gradually increases along the rolling direction. When the metal composite bar is preliminarily rolled by the previous group of rolling mill units, it will be transmitted to the profiled roll mill 4 between adjacent rolling mill units. With the rotation of the profiled roll, the metal composite bar is bitten and rolled to form an elliptical cross-section. Through the series arrangement of multiple groups of profiled roll mills 4, the metal composite bar undergoes staged elliptical deformation between adjacent rolling processes, precisely controlling the extension amount in the width direction during each rolling, avoiding stress concentration caused by large deformation in a single time, making the shape transition smoother, and further reducing the edge cracking rate. At the same time, a temperature control device is also set between the three-roll skew rolling mill 1 and the first group of rolling mill units. The temperature control device realizes heating through an induction coil and an alternating current power supply. When the metal composite bar reaches the area of the induction coil, the alternating current power supply applies an alternating current to the induction coil, generating an alternating magnetic field, causing an induced current to be generated inside the metal composite bar and generating heat due to resistance. The output power of the alternating current power supply is adjustable, which can meet the induction heating requirements of different materials and different temperatures, and the center line of the induction coil coincides with the rolling center line, ensuring that the metal composite bar is uniformly heated, avoiding rolling defects caused by local temperature differences, and improving the quality and production efficiency of the coated metal composite plate.Through the collaborative operation of the above devices, starting from the metal composite bar blank, through processes such as three-roll skew rolling for interface bonding, special-shaped pre-rolling to disperse stress, lateral extrusion to close the edges, multi-pass cyclic rolling to strengthen the interface, and precise temperature control, a coated metal composite plate with good edge closure and high interface bonding strength is finally obtained, effectively reducing the cracking rate and improving the stability.

[0051] See Figure 7 , the embodiment of the present invention also provides a rolling method for a coated metal composite plate, and the method includes the following steps: S100: Provide a metal composite bar blank; S200: Roll and bond the metal composite bar blank through a three-roll skew rolling mill 1 to obtain a metal composite bar; S300: Feed the metal composite bar into a special-shaped rolling mill 4 for special-shaped pre-rolling to obtain a metal composite bar with an elliptical cross-section; S400: Feed the metal composite bar into a rolling mill and roll it through the first rolling plane and the second rolling plane respectively to obtain a coated metal composite plate; wherein, the first rolling plane and the second rolling plane are perpendicular; S500: Repeat step S400 until a coated metal composite plate with a target thickness is obtained.

[0052] In specific implementation, first, select a metal material and form a metal composite bar blank; then send the metal composite bar blank into the three-roll skew rolling mill 1. The three rolls are arranged at a specific inclination angle. Through the radial pressure and axial friction force, the metal composite bar blank undergoes plastic deformation, and atomic diffusion forms a metallurgical bonding layer to obtain a bonded metal composite bar; subsequently, transfer the metal composite bar to the profiled roll mill 4. Under the friction force and rolling force, the metal composite bar is rolled into an elliptical cross-section, increasing the width dimension and changing the internal stress distribution to avoid stress concentration at the edges during subsequent rolling; then send the elliptical metal composite bar into the rolling mill for rolling on the first rolling plane and the second rolling plane. First, roll to make the bar extend in the width direction and the thickness decrease, and then apply a lateral extrusion force to its side along a plane perpendicular to the previous rolling plane to make the outer layer metal wrap around the center and close the edge interface to obtain a coated metal composite plate. Finally, repeat the rolling on two perpendicular planes, precisely control the reduction amount each time, and gradually reduce the thickness of the coated metal composite plate to the target size. With such a setting, the metallurgical bonding layer formed by the three-roll skew rolling mill 1 improves the composite quality, the profiled pre-rolling optimizes the rolling transition and reduces stress concentration at the edges. The cooperation of the two mutually perpendicular rolling planes can effectively reduce the thickness of the plate while ensuring good closure of the edge interface. Multiple cycles of rolling ensure the dimensional accuracy and quality of the plate. And compared with the existing method of continuously deforming the coated blank and longitudinally coating it outside the core blank, then connecting the butt joints of the coated blank, and finally rolling it into a coated metal composite plate, the coated metal composite plate obtained by rolling the metal composite bar rolled by the three-roll skew rolling mill in this application is not limited by the thickness of the coated blank and its ease of bending deformation, and has a wider applicability.

[0053] As a possible implementation, please refer to Figure 1 , after rolling and compounding the metal composite bar blank through the three-roll skew rolling mill 1 to obtain a metal composite bar, before sending the metal composite bar into the profiled roll mill 4 for profiled pre-rolling to obtain a metal composite bar with an elliptical cross-section, the rolling method further includes: controlling the temperature of the metal composite bar. The beneficial effects of controlling the temperature of the metal composite bar are as described above and will not be elaborated here.

[0054] As a possible implementation, sending the metal composite bar into the profiled roll mill 4 for profiled pre-rolling includes: sending the metal composite bar into the profiled roll mill 4 and passing it through the profiled roll mill 4 for profiled pre-rolling at a rolling speed greater than or equal to 3 m / min and less than or equal to 8 m / min.

[0055] Specifically, the metal composite rod is fed into the profiled rolling mill 4 and rolled at a transmission rolling speed of three to eight meters per minute. Among them, the rolling speed can be any speed between three and eight meters per minute, such as three meters per minute, four meters per minute, five meters per minute, or eight meters per minute. With such a setting, this speed range enables the metal composite rod to be in full and stable contact with the concave arc-shaped roll surface of the profiled rolling mill 4. At an appropriate speed, the rolling force and frictional force exerted by the rolls on the metal composite rod are more uniform, thus ensuring that the metal composite rod is rolled into an elliptical cross-section as expected with higher dimensional accuracy, and there will be no cross-sectional deformation deviation due to too fast or too slow speed, effectively avoiding quality problems such as edge stress concentration and surface unevenness caused by improper rolling speed. At the same time, controlling the rolling speed within this range also ensures that the rolling speed is not too slow, thus guaranteeing the production efficiency.

[0056] As a possible implementation, the metal composite rod is fed into the rolling mill unit and rolled through the first rolling plane and the second rolling plane respectively to obtain the coated metal composite plate, including: feeding the metal composite rod into the rolling mill unit, and successively undergoing horizontal rolling and vertical rolling for shaping to obtain the coated metal composite plate.

[0057] First, the metal composite rod is fed into the rolling mill unit, which includes the first two-high rolling mill 5 for horizontal rolling and the second two-high rolling mill 6 for vertical rolling and shaping. The metal composite rod first enters the first two-high rolling mill 5. Under the rolling action of the two horizontally arranged rolls, the metal composite rod extends in the length and width directions, and the thickness gradually decreases, thus initially forming a plate shape. Then, the plate-shaped metal composite rod enters the second two-high rolling mill 6. At this time, the rolls are vertically arranged, and a lateral extrusion force is applied to both sides along the vertical plane. Under the action of this lateral extrusion force, its sides are shaped, and the outer layer metal further wraps towards the center, making the edge interface gradually close, and finally obtaining the coated metal composite plate. With such a setting, horizontal rolling can enable the metal composite rod to extend in the length and width directions, while reducing the thickness of the plate, making it gradually approach the thickness requirement of the target plate; vertical rolling shapes its sides, ensuring the flatness and perpendicularity of the plate sides, making the shape of the entire plate more regular and meeting the production standards. And by applying a lateral extrusion force to its sides through vertical rolling, it promotes the outer layer metal to wrap towards the center, effectively closing the edge interface, improving the bonding strength of the edges, reducing the occurrence probability of defects such as edge cracking, and enhancing the stability and reliability of the coated metal composite plate. By alternately performing horizontal rolling and vertical rolling, the metal composite rod is subjected to pressure and deformation in different directions, effectively improving the comprehensive mechanical properties of the coated metal composite plate.

[0058] In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0059] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claimed rights.

Claims

1. A rolling equipment for a coated metal composite plate, characterized in that, Including: A three-roll skew rolling mill group, which is used to roll a metal composite bar blank into a metal composite bar; A profiled roll rolling mill, which is arranged downstream of the three-roll skew rolling mill group. The working roll surface of the profiled roll rolling mill has a concave roll surface, which is used to pre-roll the metal composite bar into an oval cross-section; Multiple groups of rolling mill groups, which are arranged downstream of the profiled roll rolling mill in sequence along the rolling direction. Each group of rolling mill groups includes a first two-roll rolling mill and a second two-roll rolling mill. The first two-roll rolling mill rolls the metal composite bar into a clad metal composite plate through a first rolling plane, and the second two-roll rolling mill rolls and shapes the side shape of the clad metal composite plate through a second rolling plane. The first rolling plane and the second rolling plane are perpendicular.

2. The rolling equipment for the coated metal composite plate according to claim 1, characterized in that, The concave roll surface of the profiled roll rolling mill is a concave arc roll surface, and the ratio of the radius of curvature of the concave arc roll surface to the radius of the metal composite bar is greater than or equal to 1.05 and less than or equal to 1.

80.

3. The rolling equipment for the coated metal composite plate according to claim 2, characterized in that A profiled roll rolling mill is also arranged between adjacent two groups of the rolling mill groups.

4. The rolling equipment for the coated metal composite plate according to claim 3, characterized in that, The radius of curvature of the concave roll surfaces of multiple profiled roll rolling mills gradually increases along the conveying direction of the metal composite bar.

5. The rolling equipment for the coated metal composite plate according to claim 1, characterized in that, The rolling equipment for the clad metal composite plate further includes a temperature control device, which is arranged between the three-roll skew rolling mill group and the profiled roll rolling mill; and / or, the temperature control device is arranged between adjacent two groups of the rolling mill groups.

6. The rolling equipment for the coated metal composite plate according to claim 5, characterized in that, The temperature control device includes a frame body, an alternating current power supply and an induction coil. The alternating current power supply and the induction coil are arranged on the frame body. The induction coil and the alternating current power supply are electrically connected. The induction coil is used to surround the metal composite bar for heating; and / or, the temperature control device includes a box body and a gas cooling device, which is arranged on the box body and is used to introduce cooling gas into the box body to cool the metal composite bar; and / or, the temperature control device includes a box body and a water spraying cooling device, which is arranged on the box body and is used to spray cooling water into the box body to cool the metal composite bar.

7. A rolling method for a coated metal composite plate, characterized in that, Using the rolling equipment for the clad metal composite plate according to any one of claims 1-6, the rolling method includes the following steps: S100: Provide a metal composite bar blank; S200: Roll and composite the metal composite bar blank through a three-roll skew rolling mill group to obtain a metal composite bar; S300: Feed the metal composite bar into a profiled roll rolling mill for profiled pre-rolling to obtain the metal composite bar with an oval cross-section; S400: Feed the metal composite bar into the rolling mill group and roll it through the first rolling plane and the second rolling plane respectively to obtain a clad metal composite plate; wherein, the first rolling plane and the second rolling plane are perpendicular; S500: Repeat step S400 until the clad metal composite plate with the target thickness is obtained.

8. The rolling method of the coated metal composite plate according to claim 7, characterized in that After rolling and compounding the metal composite billet through a three-roll skew rolling mill to obtain a metal composite bar, and before feeding the metal composite bar into a profiled roll mill for profiled pre-rolling, the rolling method further includes: regulating the temperature of the metal composite bar.

9. The rolling method of the coated metal composite plate according to claim 7, characterized in that, The feeding the metal composite bar into a profiled roll mill for profiled pre-rolling includes: feeding the metal composite bar into a profiled roll mill, and performing profiled pre-rolling through the profiled roll mill at a rolling speed greater than or equal to 3 m / min and less than or equal to 8 m / min.

10. The rolling method of the coated metal composite plate according to claim 7, characterized in that, The feeding the metal composite bar into a rolling mill and rolling it through a first rolling plane and a second rolling plane respectively to obtain a clad metal composite plate includes: feeding the metal composite bar into a rolling mill, and successively performing horizontal rolling and vertical rolling for shaping to obtain a clad metal composite plate.

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