Casting roller of double-roller casting and rolling machine
By opening cooling grooves on the inner wall of the casting roll sleeve and optimizing the water channel design, the problems of insufficient heat exchange and uneven cooling of the casting rolls in the twin-roll casting mill were solved, thereby improving production efficiency and product quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-23
- Publication Date
- 2026-03-24
AI Technical Summary
The existing twin-roll casting and rolling mills suffer from insufficient heat exchange capacity and poor cooling uniformity of the casting rolls, resulting in low production efficiency and poor product quality.
Multiple axially parallel cooling grooves are opened on the inner wall of the roll sleeve of the casting roll, and independent axial water inlet and return pipes are set inside the roll core. Combined with a high thermal conductivity composite coating, the flow path and distribution of the cooling medium are optimized.
It significantly improves heat exchange area and efficiency, optimizes temperature distribution, enhances production efficiency and product quality, and extends equipment lifespan.
Smart Images
Figure CN224026440U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to metallurgical technical field relates to a kind of double roll casting mill casting roll. BACKGROUND
[0002] As the core process of short process near-end forming manufacturing, double roll casting technology is widely used in ferrous metal (such as low-carbon steel, silicon steel) and non-ferrous metal field. The process realizes metal solidification and 15-50% rolling deformation simultaneously by pouring high-temperature molten metal (steel liquid 1450-1550 ℃ / aluminum liquid 680-750 ℃) directly between counter-rotating casting rolls, which can reduce production energy consumption by 55-65% and processing cost by 40-50% compared with traditional process, with significant energy-saving and emission-reducing benefits.
[0003] Casting roll is the core component of double roll casting mill, which circulates cooling water (water temperature is controlled at 30-50 ℃) inside, and high-temperature metal liquid is solidified through surface rapid cooling, and crystallization and rolling process are completed before exiting the roll gap. With the progress of process technology, the demand for casting speed is increasing, and higher requirements are put forward for the heat transfer efficiency of casting roll. In the current technology, the heat transfer efficiency is mainly improved by using high thermal conductivity materials (such as copper sleeve), but the cost is high; another solution is to open cooling grooves on the surface of roll core, but due to the insufficient wet length of cooling water contacting with roll sleeve, the heat exchange area is limitedly improved, and the heat transfer efficiency is still not ideal.
[0004] In addition, the existing cooling scheme has the problem of uneven axial temperature distribution, and the temperature difference between the middle and edge of the casting roll can reach 50 ℃, which leads to poor flatness of the produced strip. Therefore, there is an urgent need for a casting roll structure that takes into account cost-effectiveness and high-efficiency heat transfer capacity. UTILITY MODEL CONTENTS
[0005] Therefore, the purpose of the utility model is to provide a kind of double roll casting mill casting roll, solve the problem of insufficient heat exchange capacity and poor cooling uniformity in the prior art.
[0006] To achieve the above purpose, the utility model provides the following technical scheme: a kind of double roll casting mill casting roll, including roll core, roll sleeve coaxially sleeved on the outer periphery of roll core and end cover encapsulated in the both ends of roll sleeve, the inner wall of roll sleeve is provided with cooling groove along the circumferential direction, the cooling groove is arranged in multiple in the axial direction of roll sleeve, and they are axially parallel to each other;The roll core is provided with axially independent water inlet pipe and return pipe inside, and at least one is provided;The surface of roll core is provided with radial water hole, which is distributed along the circumferential direction of roll core surface, and is divided into water inlet hole and return hole, the radial water hole is distributed with the axial spacing of 2 cooling grooves, is connected with cooling groove, the water inlet end of water inlet hole is connected with water inlet pipe, and the water return end of return hole is connected with return pipe.
[0007] Optionally, the inner wall groove surface of roll sleeve is plated with high-thermal-conductivity composite coating.
[0008] Optionally, the coating comprises 60-80wt% boron nitride and 20-40wt% nickel-based alloy, and the coating thickness is 20-50μm.
[0009] Optionally, the axial spacing of the cooling grooves is uniformly distributed, and the cross-sectional size gradually decreases from the middle to both ends of the roll cover.
[0010] Optionally, the cross-sectional size of the cooling grooves remains unchanged, and the axial spacing gradually increases by 0.5-5mm per 100mm axial length from the middle to both ends of the roll cover.
[0011] Optionally, the cross-sectional shape of the cooling grooves is trapezoidal, rectangular, or circular arc, wherein the root of the trapezoidal groove and the rectangular groove is provided with a rounded corner transition.
[0012] Optionally, the cross-sectional shape of the cooling grooves periodically changes in the circumferential direction, and the periodic change includes a change in at least one of the cross-sectional depth and width, and the periodic change of adjacent grooves differs by half a cycle phase difference.
[0013] Optionally, the number of water inlet pipes and water return pipes is 1-4.
[0014] The beneficial effects of the present application are as follows:
[0015] 1) Significantly improve the heat exchange area and efficiency: the cooling grooves are directly opened in the inner wall of the roll cover, which increases the wet length and greatly improves the contact area between the cooling water and the roll cover, thereby significantly improving the heat exchange area and heat exchange capacity. This is crucial for improving the casting speed, because faster heat exchange means that the molten metal can solidify more quickly, thereby improving production efficiency.
[0016] 2) Optimize the heat transfer path: since the cooling grooves are directly located in the inner wall of the roll cover, the cooling medium (such as water) is closer to the working surface of the roll cover, so the heat transfer path is shorter and the cooling effect is more direct and rapid. This helps to ensure that the molten metal reaches the ideal crystallization and solidification state before exiting the roll gap, thereby improving product quality.
[0017] 3) Enhance cooling uniformity: by adjusting the cross-sectional size and axial spacing of the cooling grooves, fine control of the temperature distribution of the roll cover can be achieved. For example, the cross-sectional size gradually decreases from the middle to both ends of the roll cover, or the cross-sectional size remains unchanged but the axial spacing increases, which helps to reduce the temperature difference of the roll cover in the axial direction and improve the cooling uniformity. This is crucial for producing high flatness strips.
[0018] 4) Improve heat transfer efficiency and reduce scale formation: the cooling groove cross-sectional shape adopts trapezoidal or rectangular or circular arc shape, and the root of the rectangular groove and the trapezoidal groove is designed with a rounded corner, which can improve the turbulence intensity of the cooling water. Such turbulence helps to reduce or eliminate the boundary layer between the cooling water and the water hole, improving heat transfer efficiency. At the same time, the enhanced scouring effect can also reduce the formation of scale, prolong the maintenance cycle and service life of the casting and rolling roller.
[0019] In summary, the double-roll casting mill casting and rolling roller of the utility model optimizes the design of the cooling groove, not only significantly improves the heat exchange area and efficiency, but also optimizes the heat transfer path, enhances the cooling uniformity, and improves the heat transfer efficiency and reduces the scale formation, thereby meeting the current demand for increasing the casting and rolling speed, and improving the product quality and production efficiency.
[0020] Other advantages, objects and features of the present utility model will be described in the subsequent specification to some extent, and to some extent, it will be obvious to those skilled in the art based on the study of the following text or can be taught from the practice of the present utility model. The objects and other advantages of the present utility model can be achieved and obtained by the following specification. BRIEF DESCRIPTION OF DRAWINGS
[0021] In order to make the purpose, technical scheme and advantages of the present utility model more clear, the preferred detailed description of the present utility model will be described below in combination with the drawings, in which:
[0022] Figure 1 is a sectional view of the overall structure of the present utility model;
[0023] Figure 2 is Figure 1 is an enlarged view of part I;
[0024] Figure 3 is Figure 1 is a K view of
[0025] Figure 4 is Figure 1 is an A-A sectional view of
[0026] Figure 5 is a schematic diagram of the roll sleeve cooling groove embodiment 1;
[0027] Figure 6 is a schematic diagram of the roll sleeve cooling groove embodiment 2;
[0028] Figure 7 is a schematic diagram of the roll sleeve cooling groove embodiment 3;
[0029] Figure 8 is a schematic diagram of the groove along the circumferential direction dimension regularity change structure;
[0030] Figure 9 For Figure 8 Two adjacent groove cross-sectional view (i.e. B-B, C-C view).
[0031] Fig. 1 - casting roll, 2 - roll core, 3 - roll cover, 4 - end cover, 5 - cooling groove, 51 - trapezoidal, 52 - rectangular, 53 - circular arc, 6 - water inlet pipe, 7 - return pipe, 8 - radial water hole. DETAILED DESCRIPTION
[0032] The other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure of the specification. The present application can also be implemented or applied in other different specific embodiments, and various modifications or changes can be made to the details in the specification based on different views and applications without departing from the spirit of the present application. It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.
[0033] Wherein, the drawings are only used for exemplary illustration, and the representation is only a schematic diagram, not a physical diagram, and cannot be understood as a limitation of the present application; in order to better illustrate the embodiments of the present application, some components in the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some known structures and their descriptions in the drawings may be omitted.
[0034] The same or similar reference numerals in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore the positional relationship described in the drawings is only used for exemplary illustration, and cannot be understood as a limitation of the present application, for those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.
[0035] Please refer to Figures 1-9The application discloses a casting roll for a double roll casting mill, which comprises a roll core 2, a roll sleeve 3 coaxially sleeved on the outer periphery of the roll core 2, and end covers 4 encapsulated at both ends of the roll sleeve 3. The inner wall of the roll sleeve 3 is provided with circumferential cooling grooves 5, and a plurality of the cooling grooves 5 are arranged in the axial direction of the roll sleeve 3 and are axially parallel to each other. The cooling grooves are directly formed on the inner wall of the roll sleeve, the wetted length is increased, the heat exchange area is significantly increased, the heat exchange amount is increased, and the casting speed is increased. The cooling medium is closer to the working surface of the roll sleeve, the heat transfer path is shorter, and the cooling effect is more direct.
[0036] The roll core 2 is internally provided with independent axial water inlet pipes 6 and water return pipes 7, at least one of each is arranged, and the surface of the roll core 2 is provided with radial water holes 8 which are distributed at an axial interval of 2 times the cooling grooves 5 and are connected with the water inlet pipes 6 at the water inlet end and the water return pipes 7 at the water return end. The radial water holes 8 are distributed at an axial interval of 2 times the cooling grooves 5, so that each radial water hole is responsible for the water inlet or water return of two cooling grooves.
[0037] In the embodiment, when the material of the roll sleeve 3 is steel, the inner wall groove surface of the roll sleeve 3 is plated with a high-thermal-conductivity composite coating, such as a coating containing 60-80wt% boron nitride and 20-40wt% nickel-based alloy, and the thickness of the coating is 20-50μm, so that the heat conduction efficiency is further enhanced.
[0038] The axial temperature distribution of the casting roll is generally non-uniform, that is, the middle part is high and the two ends are low. In order to improve the uniformity of the roll body temperature, the following modes can be adopted. The axial interval of the cooling grooves 5 is uniformly distributed, and the cross-sectional size gradually decreases from the middle part to the two ends of the roll sleeve 3; and / or the cross-sectional size of the cooling grooves 5 is constant, and the axial interval gradually increases from the middle part to the two ends of the roll sleeve 3, and the increasing gradient is 0.5-5mm per 100mm of the axial length.
[0039] In the embodiment, the cross-sectional shape of the cooling grooves 5 formed on the inner wall of the roll sleeve 3 is periodically changed along the circumferential direction. The cross-sectional depth and width can be simultaneously changed or separately changed, and the change of adjacent grooves is different by a half period phase difference.
[0040] Figure 8 A schematic view of the structure in which the cross-sectional depth and width of the grooves are regularly changed is given, and in the view, the change is 20 degrees, that is, one change period is 40 degrees. Figure 9 is Figure 8 The cross-sectional view of two adjacent grooves is different by a half period, that is, 20 degrees. The periodic change of the cross-sectional shape of the grooves forms alternating contraction and expansion regions, causes local acceleration of the water flow, increases the turbulent intensity of the cooling water, reduces or eliminates the boundary layer between the cooling water and the water passage hole, improves the heat transfer efficiency, thereby improving the cooling efficiency, enhances the scouring between the cooling water and the wall surface of the water passage hole, reduces the probability of scale formation, and prolongs the maintenance period of the casting roll.
[0041] In the embodiment, the number of the water inlet pipe and the water return pipe is respectively provided with 1-4 pipes. The combination modes of 1 in 2 out, 1 in 3 out, 1 in 4 out, 2 in 2 out, 3 in 3 out, 4 in 4 out and the like can be realized.
[0042] Embodiment 1,
[0043] Please refer to Figure 5 The cross section shape of the cooling groove 5 is trapezoidal 51, and the trapezoidal 51 groove root is rounded.
[0044] Embodiment 2,
[0045] Please refer to Figure 6 The cross section shape of the cooling groove 5 is rectangular 52, and the rectangular 52 groove root is rounded.
[0046] Embodiment 3,
[0047] Please refer to Figure 7 The cross section shape of the cooling groove 5 is circular arc 53.
[0048] Finally, it is pointed out that the above embodiments are only used to illustrate the technical solutions of the utility model and are not limited, although the utility model is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the utility model can be modified or replaced equivalently without departing from the purpose and scope of the technical solutions, and they should be covered in the claim range of the utility model.
Claims
1. A casting roll for a twin-roll casting mill, comprising a roll core, a roll sleeve coaxially sleeved around the outer periphery of the roll core, and end caps sealed at both ends of the roll sleeve, characterized in that: The inner wall of the roller sleeve is provided with cooling grooves along the circumferential direction. Multiple cooling grooves are arranged axially on the roller sleeve and are parallel to each other. The roller core is provided with independent axial water inlet pipes and water return pipes, each with at least one pipe. The roller core surface is provided with radial water holes, which are distributed circumferentially along the roller core surface and are divided into water inlet holes and water return holes. The radial water holes are distributed at twice the axial spacing of the cooling grooves and are all connected to the cooling grooves. The water inlet end of the water inlet hole is connected to the water inlet pipe, and the water return end of the water return hole is connected to the water return pipe.
2. The casting roll of a twin-roll casting mill according to claim 1, characterized in that: The inner wall grooves of the roller sleeve are coated with a high thermal conductivity composite coating.
3. The casting roll of a twin-roll casting mill according to claim 2, characterized in that: The coating comprises 60-80 wt% boron nitride and 20-40 wt% nickel-based alloy, and the coating thickness is 20-50 μm.
4. The casting roll of a twin-roll casting mill according to claim 1, characterized in that: The cooling grooves are evenly spaced axially, and their cross-sectional dimensions gradually decrease from the middle of the roller sleeve to both ends.
5. The casting roll of a twin-roll casting mill according to claim 1, characterized in that: The cross-sectional dimensions of the cooling groove remain unchanged, and the axial spacing from the middle of the roller sleeve to both ends increases in a gradient of 0.5-5mm for every 100mm of axial length.
6. The casting roll of a twin-roll casting mill according to claim 1, characterized in that: The cross-sectional shape of the cooling trench is trapezoidal, rectangular, or arc-shaped, wherein the root of the trapezoidal trench and the rectangular trench is provided with a rounded corner transition.
7. The casting roll of a twin-roll casting mill according to claim 1, characterized in that: The cross-sectional shape of the cooling trench varies periodically along the circumference, and the periodic variation includes a change in at least one of the parameters, namely the cross-sectional depth and width, and the periodic variations of adjacent trenches differ by half a cycle phase difference.
8. The casting roll of a twin-roll casting mill according to claim 1, characterized in that: The number of inlet pipes and return pipes is 1-4 each.