Uniform heating hot rolling mill for nickel strip production

Abstract

The utility model discloses a kind of uniform heating hot rolling mill of nickel strip preparation, including installation bottom plate, hot rolling mill main body being installed on installation bottom plate, homogenizing component being connected in the upstream of hot rolling mill main body, airtight component being installed in the import and export of homogenizing component and central processing unit being electrically connected in the side of homogenizing component;Homogenizing component is used to uniformly heat nickel strip, and its export is directly connected with the inlet of hot rolling mill main body;Airtight component is used to blow off the air on the surface of nickel strip by inert gas, and make homogenizing component be filled with inert gas;The device solves that the temperature field in furnace is uneven, which leads to the large temperature difference between the core and the surface of nickel blank, the temperature inconsistency in length direction, the different deformation resistance during rolling, the rolling piece deviation, the poor plate shape, the uneven internal organization performance and other defects problems, and can effectively prevent the formation of oxide film on the surface of nickel strip after heating, avoid being pressed into the surface of strip during rolling process, and seriously affect the surface quality problem.

Description

Technical Field

[0001] This utility model relates to the field of metal material processing technology, specifically to a uniformly heated hot rolling mill for nickel strip preparation. Background Technology

[0002] Nickel and its alloys are widely used in batteries, aerospace, chemical and other fields due to their excellent corrosion resistance, high strength and good electrical conductivity. The production of nickel strip usually includes a hot rolling process, the purpose of which is to roll ingots or hot billets into strips of the required thickness.

[0003] In traditional nickel strip hot rolling processes, box furnaces or tunnel furnaces are typically used for heating. However, these furnaces suffer from severe defects such as uneven temperature fields. Specifically, this manifests as large temperature differences between the core and surface of the nickel billet and inconsistent temperatures along its length. This unevenness leads to significant differences in the deformation resistance of different parts of the billet during rolling. Consequently, the rolled piece inevitably deviates from its intended shape, becomes tail-like, and develops poor sheet shape, such as wavy edges and warping. More fundamentally, the uneven thermal field results in uneven recrystallization and grain growth, causing fluctuations in the internal structure and mechanical properties of the product in both the longitudinal and transverse directions. This severely affects the reliability and batch consistency of the final product. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a uniformly heated hot rolling mill for nickel strip preparation, which solves the problems of uneven temperature field in the furnace leading to large temperature difference between the core and surface of nickel billet and inconsistent temperature along the length direction, resulting in different deformation resistance during rolling, causing defects such as workpiece deviation, poor plate shape, and uneven internal structure and properties.

[0005] The objective of this utility model is achieved by the following technical solution: a uniformly heated hot rolling mill for nickel strip preparation, comprising a mounting base plate, a hot rolling mill body mounted on the mounting base plate, a heat homogenizing assembly connected upstream of the hot rolling mill body, an airtight assembly installed at the inlet and outlet of the heat homogenizing assembly, and a central processing unit electrically connected to the side of the heat homogenizing assembly; the heat homogenizing assembly is used to uniformly heat the nickel strip, and its outlet is directly connected to the inlet of the hot rolling mill body; the airtight assembly is used to blow away the air on the surface of the nickel strip with inert gas and to fill the heat homogenizing assembly with inert gas.

[0006] In one optional embodiment, the heat exchange assembly includes a heat exchange box fixedly connected to the mounting base plate, a heat induction coil installed inside the heat exchange box, a water tank disposed on the outer wall of the heat exchange box, and a pressure pump installed on the water tank, with a circulation pipeline connecting the water tank and the pressure pump.

[0007] In one optional implementation, the thermal induction coil is configured as a rectangular tunnel structure, and the thermal induction coil and the resonant capacitor together form an LC parallel resonant circuit, which is directly connected to the output terminal of the intermediate frequency inverter.

[0008] In one optional implementation, two circulation pipes are symmetrically arranged about the vertical central axis of the heat exchanger, and the circulation pipes are S-shaped to remove the heat generated when the thermal induction coil is working.

[0009] In one alternative embodiment, the airtight assembly includes an arched tube fixedly connected to a mounting base plate, an air inlet pipe communicating with the top of the arched tube, and a nozzle disposed on the arched tube.

[0010] In one alternative embodiment, the nozzle is configured as a venturi tube structure for ejecting an inert gas, namely nitrogen.

[0011] In one optional implementation, the central processing unit is electrically connected to the hot rolling mill body, the heat soaking assembly, and the airtight assembly. The central processing unit is configured to coordinately control the gas flow rate of the airtight assembly, the output power of the thermal induction coil, and the rolling parameters of the hot rolling mill body according to a preset rolling process model.

[0012] In one alternative implementation, the central processing unit is electrically connected to the hot rolling mill body to obtain the real-time rolling line speed; The central processing unit is further configured as follows: As the real-time rolling line speed increases, the gas flow rate of the airtight component and the output power of the heat-spreading component are increased simultaneously. Alternatively, based on the decrease in real-time rolling line speed, the gas flow rate of the airtight component and the output power of the heat spreader can be reduced simultaneously.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This device is equipped with a thermal induction coil, which uses electromagnetic eddy currents to rapidly and uniformly heat the inside of the nickel strip, completely eliminating the temperature difference between the core and surface and the length direction in traditional heating methods. This not only effectively prevents defects such as workpiece deviation and poor plate shape, but also ensures that the recrystallization process is fully uniform, resulting in a dense product structure and consistent performance, which greatly improves the reliability and yield of finished products. At the same time, the S-shaped circulation pipeline can remove the heat generated by the thermal induction coil during operation, ensuring that the equipment operates continuously and stably at a safe temperature, protecting key components from heat damage, extending their service life, and maintaining the stability of heating power, thereby ensuring the uniformity of the entire hot rolling process and the consistency of the products.

[0014] 2. This device, equipped with airtight components, uses nitrogen gas injected from nozzles to form a stable and continuous high-speed gaseous curtain at the inlet and outlet of the homogenizing components and the entrance of the hot rolling mill. This dynamic barrier effectively prevents oxygen infiltration, ensuring that the nickel strip is always under the protection of inert gas when entering and leaving the heating zone. This fundamentally eliminates the formation of surface oxide scale, ensuring a bright surface for the product while significantly reducing the consumption of high-purity inert gas, thus achieving a balance between high-quality surface and production cost control. Attached Figure Description

[0015] Figure 1 This is a top-down structural diagram of the device; Figure 2 This is a schematic diagram of the overall structure of the device from the side. Figure 3 This is a schematic diagram of the heat spreader assembly. Figure 4 This is a schematic diagram of the structure of the thermal induction coil and the circulation pipeline. Figure 5 This is a schematic diagram of the airtight component.

[0016] In the diagram: 1. Mounting base plate; 2. Hot rolling mill body; 3. Heat soaking assembly; 301. Heat soaking box; 302. Thermal induction coil; 303. Water tank; 304. Pressure pump; 305. Circulation pipeline; 4. Airtight assembly; 401. Air inlet pipe; 402. Arched pipe; 403. Nozzle; 5. Central processing unit. Detailed Implementation

[0017] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. Unless otherwise specified, the materials and equipment used in this embodiment are all commercially available. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0018] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0019] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected," "linked," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a connection through an intermediary, the internal connection of two elements, or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0020] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or apparatus.

[0021] Please refer to Figures 1 to 4A uniformly heated hot rolling mill for nickel strip preparation includes a mounting base plate 1, a hot rolling mill body 2 mounted on the mounting base plate 1, a heat homogenizing assembly 3 connected upstream of the hot rolling mill body 2, an airtight assembly 4 installed at the inlet and outlet of the heat homogenizing assembly 3, and a central processing unit 5 electrically connected to the side of the heat homogenizing assembly 3. The heat homogenizing assembly 3 is used to uniformly heat the nickel strip, and its outlet is directly connected to the inlet of the hot rolling mill body 2. The airtight assembly 4 is used to blow away air from the surface of the nickel strip with inert gas and fill the heat homogenizing assembly 3 with inert gas. The heat homogenizing assembly 3 includes a heat homogenizing box 301 fixedly connected to the mounting base plate 1, a thermal induction coil 302 installed inside the heat homogenizing box 301, a water tank 303 disposed on the outer wall of the heat homogenizing box 301, and a pressure pump 304 installed on the water tank 303. A circulation pipeline 305 is connected between the water tank 303 and the pressure pump 304. The thermal induction coil 302 is configured as a rectangular tunnel structure, and the thermal induction coil 302 is connected to a resonant electric current. The containers together form an LC parallel resonant circuit, which is directly connected to the output of the intermediate frequency inverter. Two circulation pipes 305 are symmetrically arranged about the vertical central axis of the heat exchanger 301. The circulation pipes 305 are S-shaped to remove the heat generated by the thermal induction coil 302 during operation. The nickel strip is heated rapidly and uniformly through electromagnetic eddy currents, which completely eliminates the temperature difference between the core and surface and the length direction in traditional heating methods. This not only effectively eliminates defects such as workpiece deviation and poor plate shape, but also ensures that the recrystallization process is fully uniform, resulting in a dense product structure and consistent performance, which greatly improves the reliability and pass rate of the finished product. At the same time, the S-shaped circulation pipes 305 can remove the heat generated by the thermal induction coil 302 during operation, ensuring that the equipment continues to work stably at a safe temperature, protecting key components from heat damage, extending their service life, and maintaining the stability of heating power, thereby ensuring the uniformity of the entire hot rolling process and the consistency of the product.

[0022] Please refer to Figure 1 , Figure 2 and Figure 5The airtight assembly 4 includes an arched pipe 402 fixedly connected to the mounting base plate 1, an air inlet pipe 401 connected to the top of the arched pipe 402, and a nozzle 403 disposed on the arched pipe 402. The nozzle 403 is configured as a Venturi tube structure for spraying inert gas, which is nitrogen. The central processing unit 5 is electrically connected to the hot rolling mill body 2, the heat soaking assembly 3, and the airtight assembly 4. The central processing unit 5 is configured to coordinately control the gas flow rate of the airtight assembly 4, the output power of the thermal induction coil 302, and the rolling parameters of the hot rolling mill body 2 according to a preset rolling process model. The central processing unit 5 is electrically connected to the hot rolling mill body 2 to obtain the real-time rolling line speed. The central processing unit 5 is further configured to: according to the real-time rolling line speed... The increase in rolling line speed simultaneously increases the gas flow rate of the airtight component 4 and the output power of the heat soaking component 3; or the decrease in real-time rolling line speed simultaneously reduces the gas flow rate of the airtight component 4 and the output power of the heat soaking component 3. By injecting nitrogen from the nozzle 403, a stable and continuous high-speed gas curtain can be formed at the inlet and outlet of the heat soaking component 3 and the inlet of the hot rolling mill body 2. This dynamic barrier can effectively prevent oxygen from penetrating, ensuring that the nickel strip is always under the protection of inert gas when entering and leaving the heating zone, fundamentally eliminating the formation of surface oxide scale. While ensuring that the product obtains a bright surface, it significantly reduces the consumption of high-purity inert gas, achieving a balance between high-quality surface and production cost control.

[0023] Working principle: Before the nickel strip enters the soaking chamber 301, nitrogen gas is sprayed onto the upper and lower surfaces of the nickel strip through nozzles 403 in the airtight assembly 4 at the inlet of the soaking chamber 301. The nitrogen gas blows away the oxygen on the nickel strip and also flows into the soaking chamber 301, filling it with nitrogen. When the nickel strip passes the front end of the thermal induction coil 302, the alternating magnetic field induces eddy currents inside the strip, causing the nickel strip to generate heat rapidly and uniformly. When the nickel strip passes the rear end of the thermal induction coil 302, it will provide temperature compensation across the entire width of the nickel strip. In addition to compensation and balance, during the operation of the thermal induction coil 302, it will generate heat due to its resistance. At this time, the liquid continuously circulating in the circulation pipe 305 will exchange heat with the thermal induction coil 302, thereby carrying away the heat generated by the operation of the thermal induction coil 302. After the nickel strip is heated, it passes through the airtight component 4 at the outlet of the heat soaking box 301. At this time, the nitrogen gas sprayed by the nozzle 403 will keep the surface of the nickel strip in an inert gas environment to prevent it from oxidizing. Then it enters the hot rolling mill body 2 for pressing.

[0024] Although only certain components and embodiments of this application have been illustrated and described, many modifications and alterations will be apparent to those skilled in the art without actually departing from the scope and spirit of the claims, such as variations in the size, dimensions, structure, shape and proportion of the various elements, installation arrangement, material use, color, orientation, etc.

[0025] Finally, it should be noted that the above embodiments are only preferred embodiments of this utility model and should not be used to limit the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A uniformly heated hot rolling mill for nickel strip preparation, characterized in that: It includes a mounting base plate (1), a hot rolling mill body (2) mounted on the mounting base plate (1), a heat soaking component (3) connected upstream of the hot rolling mill body (2), an airtight component (4) installed at the inlet and outlet of the heat soaking component (3), and a central processing unit (5) electrically connected to the side of the heat soaking component (3). The heat equalization assembly (3) is used to uniformly heat the nickel strip, and its outlet is directly connected to the inlet of the hot rolling mill body (2); The airtight assembly (4) is used to blow out the air from the surface of the nickel strip with inert gas and to fill the heat spreader assembly (3) with inert gas.

2. The uniformly heated hot rolling mill for nickel strip preparation according to claim 1, characterized in that, The heat exchange assembly (3) includes a heat exchange box (301) fixedly connected to the mounting base plate (1), a heat induction coil (302) installed inside the heat exchange box (301), a water tank (303) set on the outer wall of the heat exchange box (301), and a pressure pump (304) installed on the water tank (303). A circulation pipeline (305) is connected between the water tank (303) and the pressure pump (304).

3. The uniformly heated hot rolling mill for nickel strip preparation according to claim 1, characterized in that, The thermal induction coil (302) is configured as a rectangular tunnel structure. The thermal induction coil (302) and the resonant capacitor together form an LC parallel resonant circuit, which is directly connected to the output terminal of the intermediate frequency inverter.

4. The uniformly heated hot rolling mill for nickel strip preparation according to claim 1, characterized in that, There are two circulation pipes (305) symmetrically arranged about the vertical central axis of the heat exchange box (301). The shape of the circulation pipes (305) is set as S-shaped to remove the heat generated by the heat induction coil (302) when it is working.

5. A uniformly heated hot rolling mill for nickel strip preparation according to claim 1, characterized in that, The airtight assembly (4) includes an arched tube (402) fixedly connected to the mounting base plate (1), an air inlet pipe (401) connected to the top of the arched tube (402), and a nozzle (403) disposed on the arched tube (402).

6. A uniformly heated hot rolling mill for nickel strip preparation according to claim 5, characterized in that, The nozzle (403) is configured as a venturi tube for spraying an inert gas, which is nitrogen.

7. A uniformly heated hot rolling mill for nickel strip preparation according to claim 5, characterized in that, The central processing unit (5) is electrically connected to the hot rolling mill body (2), the heat soaking component (3), and the airtight component (4). The central processing unit (5) is configured to coordinately control the gas flow rate of the airtight component (4), the output power of the thermal induction coil (302), and the rolling parameters of the hot rolling mill body (2) according to the preset rolling process model.

8. A uniformly heated hot rolling mill for nickel strip preparation according to claim 1, characterized in that, The central processing unit (5) is electrically connected to the hot rolling mill body (2) to obtain the real-time rolling line speed; The central processing unit (5) is further configured as follows: According to the increase in real-time rolling line speed, the gas flow rate of the airtight component (4) and the output power of the heat-spreading component (3) are increased simultaneously; Alternatively, based on the decrease in real-time rolling line speed, the gas flow rate of the airtight component (4) and the output power of the heat-spreading component (3) can be reduced simultaneously.

Images