Brass plate water cooling forming device with uniform cooling function

Abstract

The application relates to the technical field of brass plate cooling, and provides a brass plate water-cooling forming device with uniform cooling function, which comprises a supporting mechanism, a heat preservation water tank, a plurality of transmission rollers and a rotating driving mechanism, the transmission roller comprises a roller shaft, a water storage inner layer and a water permeation outer layer, the water storage inner layer is coaxially sleeved on the outer circumferential surface of the roller shaft, the water permeation outer layer is coaxially sleeved on the outer circumferential surface of the water storage inner layer, the porosity of the water storage inner layer is greater than that of the water permeation outer layer, the water permeation outer layer has a water permeation density which is gradually reduced from the middle part to the two ends along the axial direction of the roller shaft, and the contact area formed between the outer circumferential surface of the water permeation outer layer and the bottom surface of the brass plate has a liquid film thickness which is gradually reduced from the middle part to the two ends along the axial direction of the roller. The brass plate water-cooling forming device with uniform cooling function provided by the application can solve the technical problems that some brass plates may have plate shape defects such as edge waves, middle waves or warping after being cooled, the flatness is not ideal, the brass plate is deformed again in subsequent processing or even cracks along the plate width direction.

Description

Technical Field

[0001] This application relates to the field of brass plate cooling technology, and in particular to a water-cooled forming apparatus for brass plates with uniform cooling function. Background Technology

[0002] In industrial production, high-temperature brass sheets typically require forced cooling equipment to rapidly cool the workpiece from its high temperature to a target temperature range, thereby controlling internal structural changes or locking in the product shape. Cooling equipment is a crucial link in the production line connecting high-temperature processing steps with subsequent room-temperature treatment steps; the cooling rate and uniformity have a significant impact on the final quality of the workpiece.

[0003] In existing technologies, the water-cooled forming methods for brass plates mainly include the following four types: First, roller conveying combined with spray cooling, where spray pipes are arranged above or on both sides of the conveyor rollers, and the brass plate is sprayed with low-temperature cooling water from top to bottom while being conveyed by the rollers. The flow rate and coverage of the spray water are basically equal at all points on the plate surface. Second, nozzles are arranged between the rollers to spray water cooling onto the bottom surface of the plate. Nozzles are set in the gap between adjacent conveyor rollers to spray low-temperature cooling water onto the bottom surface of the brass plate from below. The spray flow rate and pressure of each nozzle are uniformly set, and the water distribution intensity along the width of the plate is consistent. Third, indirect cooling with sealed water-cooled rollers with internal water circulation, where the conveyor rollers are hollow and circulating low-temperature cooling water is circulated inside. When the brass plate comes into contact with the roller surface, it is cooled through heat conduction through the roller wall. The inlet water temperature and flow rate of each water-cooled roller are uniformly controlled. Fourth, immersion cooling, where the brass plate and the conveyor rollers are immersed in a cooling liquid tank. The brass plate is cooled below the liquid surface, and the temperature and flow rate of the cooling liquid in each area of ​​the tank tend to be consistent.

[0004] The above methods each have their own focus on improving cooling and heat exchange capacity. However, after cooling, some brass plates may exhibit plate shape defects such as edge waviness, center waviness, or warping (especially for thin brass plates with a large width and thickness, which are more prone to edge waviness, center waviness, or warping due to their weak rigidity in the thickness direction). The flatness of the brass plate is not ideal, and during subsequent shearing, stamping, or bending processes, the brass plate may undergo secondary deformation or even crack along the width direction. Summary of the Invention

[0005] This application provides a brass plate water-cooling forming device with uniform cooling function, which can improve the technical problems in related technologies where brass plate water-cooling forming devices may have plate shape defects such as edge waviness, center waviness or warping after cooling, the flatness of the brass plate is not ideal, and the brass plate will undergo secondary deformation or even crack along the width direction during subsequent shearing, stamping or bending processes.

[0006] This application provides a brass sheet water-cooled forming apparatus with uniform cooling function, including: Supporting institutions; An insulated water tank is installed on the support mechanism, and the insulated water tank is used to hold low-temperature cooling water. Multiple drive rollers are arranged sequentially at intervals on the support mechanism and located above the insulated water tank; A rotation drive mechanism is installed on the support mechanism, and the power output end of the rotation drive mechanism is connected to the transmission roller to drive the transmission roller to rotate. The transmission roller includes a roller shaft, a water-retaining inner layer, and a water-permeable outer layer. The roller shaft is driven to the power output end of the rotation drive mechanism. The water-retaining inner layer is coaxially sleeved on the outer circumferential surface of the roller shaft, and the water-permeable outer layer is coaxially sleeved on the outer circumferential surface of the water-retaining inner layer. The porosity of the water-retaining inner layer is greater than that of the water-permeable outer layer. Both the water-retaining inner layer and the water-permeable outer layer are partially immersed in the low-temperature cooling water in the heat-insulating water tank, and partially above the liquid level of the low-temperature cooling water, so that the water-permeable outer layer can support the brass plate to be cooled. The low-temperature cooling water in the heat-insulating water tank enters and is distributed in the water-retaining inner layer and the water-permeable outer layer. The low-temperature cooling water in the inner water storage layer seeps out to the outer peripheral surface of the outer water-permeable layer. The outer peripheral surface of the outer water-permeable layer forms a contact area with the bottom surface of the brass plate and forms a liquid film in the contact area. The outer water-permeable layer has a water-permeable density that gradually decreases from the middle to both ends along the axial direction of the roller shaft, so that the liquid film formed in the contact area has a thickness that gradually decreases from the middle to both ends along the axial direction of the roller shaft.

[0007] The technical solution described above in this application embodiment has at least the following technical effects: by setting the transmission roller as a three-layer composite structure of roller shaft, water storage inner layer and water seepage outer layer, the water storage inner layer uses its high porosity to draw in low-temperature cooling water from the heat preservation water tank and distribute it along the roller shaft axis, providing water supply along the axial direction for the water seepage outer layer. The water seepage outer layer uses its water seepage density, which decreases gradually from the middle to both ends along the axial direction, to differentiate the low-temperature cooling water seeping out from the water storage inner layer. The unit area seepage amount is large near the middle high water seepage density area, forming a thicker liquid film, while the unit area seepage amount is small near the two ends low water seepage density area, forming a thinner liquid film. This makes the thickness of the liquid film formed in the contact area between the outer peripheral surface of the water seepage outer layer and the bottom surface of the brass plate gradually decrease along the roller shaft axis from the middle to both ends. During the forming process of brass sheets, more heat accumulates and dissipates slowly in the central area, while less heat accumulates and dissipates quickly at the edges. The thicker liquid film in the middle of the outer layer of the water seepage layer evaporates and absorbs more heat in the central area, resulting in a greater cooling intensity, while the thinner liquid film evaporates and absorbs less heat at the edges, resulting in a less intense cooling intensity. The cooling intensity adaptively matches the temperature distribution along the width of the sheet, achieving differentiated gradient cooling with strong cooling in the central area and weak cooling at the edges without the need for external sensors or control systems. This helps reduce the difference in cooling effect between the central and edge areas, improves the cooling uniformity across the entire width of the sheet, and reduces the likelihood of sheet defects such as edge waviness, center waviness, or warping (especially for thin brass sheets with a large width-to-thickness ratio, where the thickness direction has weak rigidity and uneven thermal shrinkage caused by uneven cooling in the width direction is more likely to lead to edge waviness, center waviness, or warping). This also improves the flatness of the brass sheet and reduces the risk of secondary deformation or even cracking along the width direction during subsequent shearing, stamping, or bending processes. In addition, the inner water-retaining layer and the outer water-permeable layer are only partially immersed in low-temperature cooling water. During the rotation of the drive roller, the immersed area absorbs water, while the non-immersed area forms a liquid film on the bottom surface of the brass plate for evaporation and cooling. Water absorption and cooling alternate with rotation, which helps to maintain a continuous and stable supply of liquid film. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 A three-dimensional structural schematic diagram of a brass plate water-cooled forming apparatus with uniform cooling function provided in an embodiment of this application; Figure 2 A front structural schematic diagram of a brass plate water-cooled forming apparatus with uniform cooling function provided in an embodiment of this application; Figure 3A schematic diagram of the internal structure of the insulated water tank of the brass plate water-cooled forming device with uniform cooling function provided in the embodiments of this application; Figure 4 A three-dimensional structural schematic diagram of the transmission roller provided in an embodiment of this application; Figure 5 A schematic diagram of the isometric cross-sectional structure of the transmission roller provided in an embodiment of this application; Figure 6 A schematic diagram of the three-dimensional structure of the water-cooled inner layer of the brass plate water-cooling forming device with uniform cooling function provided in the embodiments of this application.

[0010] The following are the labeling elements in the figure: 100. Brass sheet water-cooling forming device; 10. Support mechanism; 20. Rotation drive mechanism; 30. Transmission roller; 301. Water storage chamber; 302. First water replenishment chamber; 303. Second water replenishment chamber; 31. Roller shaft; 32. Water storage inner layer; 321. End ring; 322. Annular flange; 3201. Annular groove; 33. Water-permeable outer layer; 331. First density section; 3311. First boss; 3301. First groove; 332. Second density section; 3302. Second groove; 3321. Second boss; 333. Third density section; 40. Insulating water tank; 41. Low-temperature cooling water; 50. Spray assembly; 60. Brass sheet. Detailed Implementation

[0011] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0012] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0013] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0014] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this application.

[0015] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0016] In this application, "and / or" is merely a way of describing the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0017] It should be noted that in this application, the words "in some embodiments," "exemplarily," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "in some embodiments," "exemplarily," or "for example" should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of words such as "in some embodiments," "exemplarily," and "for example" is intended to present related concepts in a specific manner, meaning that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of this application. The appearance of the above words in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0018] In existing technologies, water-cooled forming methods for brass sheets mainly include the following four types: First, roller conveyor combined with spray cooling, where spray pipes are arranged above or on both sides of the conveyor rollers. The brass sheet is conveyed forward by the rollers while being sprayed with low-temperature cooling water from top to bottom. The flow rate and coverage of the sprayed water are basically equal throughout the sheet surface, with the central and edge areas receiving approximately the same amount of low-temperature cooling water. Second, nozzles are arranged between rollers to spray water onto the bottom surface of the sheet. Nozzles are installed between adjacent conveyor rollers to spray low-temperature cooling water onto the bottom surface of the brass sheet from below. The nozzle spray flow rate and pressure are uniformly set, and the water distribution intensity along the width of the plate is consistent; thirdly, the internal water-cooled rollers are used for indirect cooling, that is, the conveyor rollers are hollow structures with circulating low-temperature cooling water flowing inside. When the brass plate comes into contact with the roller surface, it is cooled by heat conduction through the roller wall. The water inlet temperature and flow rate of each water-cooled roller are uniformly controlled, and the heat conduction capacity along the roller surface axis is basically uniform; fourthly, immersion cooling is used, that is, the brass plate and the conveyor roller are immersed in the cooling liquid tank as a whole. The brass plate is cooled below the liquid surface, and the temperature and flow rate of the cooling liquid in each area of ​​the tank tend to be consistent. The above methods each have their own improvements in cooling and heat exchange capacity, but the cooling intensity provided to the central and edge areas of the plate is basically the same. They cannot self-adjust the cooling intensity according to the actual temperature differences in different areas of the brass plate. The central area of ​​the plate is insufficiently cooled due to the large heat accumulation, while the edge area is over-cooled due to the rapid heat dissipation. Uneven thermal contraction occurs in the width direction of the plate, resulting in plate shape defects such as edge waviness, central waviness, or warping after cooling. The flatness of the plate is also poor. In subsequent shearing, stamping, or bending processes, the brass plate is prone to secondary deformation or even cracking along the width direction due to the release of residual stress.

[0019] Based on this, in order to improve the problems in the brass plate water-cooling forming device of related technologies, such as edge waviness, center waviness or warping of some brass plates after cooling, the flatness of the brass plate is not ideal, and the brass plate undergoes secondary deformation or even cracks along the width direction during subsequent shearing, stamping or bending processing, the embodiments of this application provide the following solutions.

[0020] Please refer to the following: Figures 1 to 6 This application provides a brass plate water-cooled forming device 100 with uniform cooling function, including a support mechanism 10, a heat-insulating water tank 40, multiple transmission rollers 30 and a rotation drive mechanism 20.

[0021] It can be understood that the support mechanism 10 serves as the mounting base for the brass sheet water-cooled forming device 100, and is used to support and install the heat-insulating water tank 40, the transmission rollers 30, and the rotation drive mechanism 20. Specifically, the support mechanism 10 includes a base and side plates that are vertically arranged on both sides of the base. The side plates are parallel to each other and spaced apart. A row of bearing mounting holes is provided on each side plate, and the bearing mounting holes are arranged at equal intervals along the length of the side plate for installing the roller shafts 31 of each transmission roller 30.

[0022] The insulated water tank 40 is installed between the two side plates of the support mechanism 10, located at the lower part of the support mechanism 10. The insulated water tank 40 has a rectangular tank structure, and its length direction is consistent with the length direction of the side plates. The insulated water tank 40 is made of metal, and the outside of the insulated water tank 40 can be wrapped with insulation material to reduce the heat exchange between the low-temperature cooling water 41 inside the insulated water tank 40 and the external environment, reduce the rate of heat transfer from the outside to the low-temperature cooling water 41, and slow down the temperature rise of the low-temperature cooling water 41, which is beneficial to reducing the operating load and energy consumption of the refrigeration mechanism. The insulated water tank 40 is used to hold the low-temperature cooling water 41. The liquid level of the low-temperature cooling water 41 is lower than the axial height of the roller 31 to ensure that the roller 31 does not directly contact the low-temperature cooling water 41, but is only submerged in the low-temperature cooling water 41 by the lower half of the inner water storage layer 32 and the outer water seepage layer 33.

[0023] For example, the material of the insulated water tank 40 can be SUS304 stainless steel, and the insulation material can be rigid polyurethane foam. The rigid polyurethane foam is applied to the outer side and bottom of the insulated water tank 40 by on-site spraying or by pasting prefabricated panels. It has a high closed-cell rate and low thermal conductivity, which can achieve good insulation effect with a small thickness. The thickness of the insulation layer can be 20mm to 50mm to maintain the temperature of the low-temperature cooling water 41 within the preset low-temperature range, and to prevent the temperature of the low-temperature cooling water 41 from gradually rising and the cooling capacity from decreasing due to continuous absorption of heat from the brass plate 60.

[0024] Of course, in some other embodiments, the insulation material may also be any one of extruded polystyrene foam board, rubber and plastic sponge, or vacuum insulation board.

[0025] In some embodiments, a refrigeration mechanism for cooling the low-temperature cooling water 41 can be installed inside the insulated water tank 40. After absorbing heat from the brass plate 60, the temperature of the low-temperature cooling water 41 gradually increases. The refrigeration mechanism continuously cools the low-temperature cooling water 41 in the insulated water tank 40, keeping it within a preset low-temperature range to ensure continuous and stable cooling capacity.

[0026] For example, the preset low temperature range of the low temperature cooling water is between 5°C and 15°C.

[0027] For example, the refrigeration mechanism can be a heat exchange coil, which is installed on the inner bottom wall or inner side wall of the insulated water tank 40. The inlet and outlet of the heat exchange coil pass through the wall of the insulated water tank 40 and are connected to the external refrigeration system. The low-temperature refrigerant provided by the refrigeration system circulates in the heat exchange coil and exchanges heat with the low-temperature cooling water 41 in the insulated water tank 40 through the tube wall of the heat exchange coil, thereby removing the heat from the low-temperature cooling water 41 and lowering its temperature.

[0028] It is understandable that the external refrigeration system can be any of the following: a vapor compression refrigeration cycle system, an absorption refrigeration system, or a semiconductor refrigeration system, as long as it can continuously supply low-temperature refrigerant to the heat exchange coil. By directly installing the heat exchange coil inside the insulated water tank 40, the refrigerant and the low-temperature cooling water 41 are separated only by the tube wall of the heat exchange coil, resulting in low thermal resistance and high heat exchange efficiency, which is beneficial for quickly bringing the temperature of the low-temperature cooling water 41 back to the target range.

[0029] The rotation drive mechanism 20 is installed on one side of the support mechanism 10. The rotation drive mechanism 20 includes a drive motor and a chain drive mechanism. The drive motor is fixedly installed on the base of the support mechanism 10. The chain drive mechanism includes a drive sprocket, a driven sprocket, and a chain. The drive sprocket is fixedly sleeved on the power output end of the drive motor. Each driven sprocket is fixedly sleeved on one end of the roller shaft 31 of each transmission roller 30. The chain is wrapped around the outer circumference of the drive sprocket and all the driven sprockets. The drive motor synchronously drives all the transmission rollers 30 to rotate around the axis of their respective roller shaft 31 through the chain drive mechanism, thereby conveying the brass plate 60 to be cooled forward along the conveying direction.

[0030] Of course, in some other embodiments, the rotation drive mechanism 20 can also use a belt drive mechanism instead of a chain drive mechanism. The belt drive mechanism includes a driving pulley, a driven pulley and a drive belt. The driving pulley is fixedly sleeved on the power output end of the drive motor. Each driven pulley is fixedly sleeved on one end of the roller shaft 31 of each drive roller 30. The drive belt is wrapped around the outer circumference of the driving pulley and all the driven pulleys. As long as it can synchronously drive multiple drive rollers 30 to rotate.

[0031] Please refer to the following: Figure 4 and Figure 5 The transmission roller 30 includes a roller shaft 31, a water-retaining inner layer 32, and a water-permeable outer layer 33.

[0032] The roller 31 is a solid cylindrical metal shaft. Both ends of the roller 31 are rotatably mounted in the bearing mounting holes of the two side plates of the support mechanism 10 via bearings. One end of the roller 31 extends out of the side plate and is fixedly connected to the driven sprocket, thus enabling transmission connection with the power output end of the rotation drive mechanism 20. The axial height of the roller 31 is higher than the liquid level of the low-temperature cooling water 41 in the insulation water tank 40, ensuring that the roller 31 is always above the liquid surface of the low-temperature cooling water 41 and does not directly contact it, which helps reduce corrosion and movement resistance of the roller 31.

[0033] The inner water-retaining layer 32 is a cylindrical sleeve structure, coaxially sleeved on the outer circumferential surface of the roller 31, and can rotate synchronously with the roller 31. The inner water-retaining layer 32 is made of a porous material with high porosity, used to quickly absorb low-temperature cooling water 41 from the heat-insulating water tank 40 and uniformly distribute the low-temperature cooling water 41 along the entire axial length of the roller 31.

[0034] It is understandable that the inner water storage layer 32 adopts a porous structure with a large number of interconnected micropore channels inside. Under the combined action of capillary action and the centrifugal force generated by the rotation of the drive roller 30, the low-temperature cooling water 41 enters and is distributed in these micropore channels. The high porosity of the inner water storage layer 32 ensures that it has a strong absorption capacity for low-temperature cooling water 41 and a large water storage capacity, and can continuously draw low-temperature cooling water 41 from the heat preservation water tank 40 and stably supply low-temperature cooling water 41 to the permeable outer layer 33.

[0035] In this embodiment, the water-retaining inner layer 32 utilizes its high porosity to achieve efficient absorption and uniform axial distribution of the low-temperature cooling water 41. Compared with the prior art of directly spraying the low-temperature cooling water 41 or supplying it to the roller surface through a closed pipeline, the water-retaining inner layer 32 passively absorbs and distributes the low-temperature cooling water 41 through its internal porous network structure, eliminating the need for external pressurization or spraying systems. This results in a simpler structure, and the axial distribution of the low-temperature cooling water 41 within the water-retaining inner layer 32 is more uniform, which is beneficial for providing a stable water supply to the seepage outer layer 33.

[0036] Optionally, the inner water-retaining layer 32 can be made of a sintered porous metal material, such as bronze powder or brass powder, which is sintered and then processed. Its compressive strength is not less than 80 MPa. The inner water-retaining layer 32 is located between the roller 31 and the outer water-permeable layer 33, and is constrained by the radial covering of the two. The load-bearing requirements are relatively low, and a formula with higher porosity can be used. By adjusting the powder particle size and sintering parameters, the porosity can be controlled within the range of 30% to 50%. For example, the thickness of the inner water-retaining layer 32 can be 8 mm to 15 mm, and the porosity can be 35% to 45%.

[0037] The water-permeable outer layer 33 is a cylindrical sleeve structure, coaxially fitted onto the outer circumferential surface of the water-storing inner layer 32. The outer circumferential surface of the water-permeable outer layer 33 is used to directly contact and support the brass plate 60 to be cooled. The water-permeable outer layer 33 is made of a porous material with a porosity lower than that of the water-storing inner layer 32. The porosity of the water-permeable outer layer 33 can range from 5% to 15% to control the rate at which low-temperature cooling water 41 permeates from the water-storing inner layer 32 to the outer circumferential surface of the water-permeable outer layer 33, so that a uniform and stable liquid film is formed on the outer surface, rather than a large amount of water gushing out.

[0038] Optionally, the water-permeable outer layer 33 can also be made of sintered porous metal material, such as bronze powder or brass powder sintered and then processed, with a compressive strength of not less than 150 MPa to meet the requirements of directly supporting the high-temperature brass plate 60; by adjusting the sintering temperature and pressing pressure, its porosity is controlled within the range of 5% to 15%, and the porosity is adjusted by controlling the sintering process parameters to achieve the required water-permeable density. For example, the thickness of the water-permeable outer layer 33 can be 6 mm to 12 mm.

[0039] Both the inner water-retaining layer 32 and the outer water-permeable layer 33 are partially submerged in the low-temperature cooling water 41 of the insulated water tank 40, and partially above the liquid surface of the low-temperature cooling water 41. Specifically, the lower regions of both the inner water-retaining layer 32 and the outer water-permeable layer 33 are submerged in the low-temperature cooling water 41, while the upper regions are above the liquid surface. When the brass plate 60 is placed on the drive roller 30, the bottom surface of the brass plate 60 contacts the outer peripheral surface of the outer water-permeable layer 33, forming a contact area between them. Since the outer water-permeable layer 33 is only partially submerged in water, its upper part carries an appropriate amount of low-temperature cooling water 41 to form a liquid film when it rotates to contact the brass plate 60, preventing the brass plate 60 from being directly immersed in water and causing overcooling.

[0040] Low-temperature cooling water 41 in the insulated water tank 40 enters the inner water storage layer 32 and the outer water seepage layer 33 through the end ring 321 and the outer water seepage layer 33, and is distributed in the porous network of the inner water storage layer 32 and the water storage cavity 301. Then, it seeps out to the outer peripheral surface of the outer water seepage layer 33 through the interface between the inner water storage layer 32 and the outer water seepage layer 33. The outer peripheral surface of the outer water seepage layer 33 forms a contact area with the bottom surface of the brass plate 60 and forms a liquid film in the contact area. The low-temperature cooling water 41 in the liquid film evaporates and absorbs the heat of the brass plate 60, thus achieving evaporative cooling.

[0041] The water-permeable outer layer 33 has a water-permeable density that gradually decreases from the middle to both ends along the axial direction of the roller shaft 31, so that the liquid film formed in the contact area has a thickness that gradually decreases from the middle to both ends along the axial direction of the roller shaft 31, thereby enabling different degrees of evaporative cooling of different areas of the brass plate 60 in the plate width direction.

[0042] With this setup, compared to roller conveyor combined with spray cooling, the flow rate and coverage of sprayed water are basically equal across the board surface, and the amount of low-temperature cooling water 41 obtained in the middle and at the edges of the board is roughly the same. However, in this solution, the water-permeable outer layer 33 has a water-permeable density that decreases along the axial direction, and the thickness of the liquid film formed in the contact area varies along the axial direction, which can adaptively match the cooling intensity according to the temperature distribution across the width of the brass plate 60. Compared to the method of spraying water onto the bottom surface of the board with nozzles arranged between rollers, the water distribution intensity of each nozzle along the width of the board is consistent, and it is also difficult to adjust the local cooling amount according to the temperature difference of the board. In this solution, the thickness of the liquid film is controlled by the gradient water-permeable density of the water-permeable outer layer 33 itself, providing stronger cooling to the middle area of ​​the board and weaker cooling to the edge area. Compared to the indirect cooling method of sealed water-cooled rollers with internal water flow, where the inlet water temperature and flow rate of each water-cooled roller are uniformly controlled and the heat conduction capacity of the roller surface along the axial direction is basically uniform, this solution uses evaporative cooling instead of heat conduction cooling. Furthermore, the water density of the middle and both ends of the water-permeable outer layer 33 is set differently to achieve gradient adjustment of cooling intensity along the axial direction. Compared to the immersion cooling method, where the temperature and flow rate of the coolant in each area of ​​the liquid tank tend to be consistent and the brass plate 60 is immersed in the coolant throughout the process, the heat exchange conditions in each area are basically the same. However, in this solution, the brass plate 60 receives gradient thickness liquid film evaporative cooling in the non-immersed area at the top of the water-permeable outer layer 33. The thickness of the liquid film matches the temperature distribution in the width direction of the plate, achieving differentiated adjustment of strong cooling in the middle of the plate and weak cooling at the edges. This helps reduce the difference in cooling effect between the center and the edge of the plate, improves the cooling uniformity across the entire width of the plate, reduces the possibility of edge waviness, center waviness, or warping defects in the brass plate 60, improves the flatness of the brass plate 60, and reduces the risk of secondary deformation or even cracking along the width direction of the brass plate 60 during subsequent shearing, stamping, or bending processes. Furthermore, the water-retaining inner layer 32 and the water-permeable outer layer 33 are only partially immersed in the low-temperature cooling water 41. During the rotation of the drive roller 30, the immersed area absorbs water, while the non-immersed area forms a liquid film on the bottom surface of the brass plate 60 for evaporative cooling. Water absorption and cooling alternate with rotation, which helps maintain a continuous and stable supply of the liquid film.

[0043] Furthermore, compared to roller conveyor combined with spray cooling, in this scheme, the drive roller 30 itself serves as the supply component for the low-temperature cooling water 41. The inner water storage layer 32 passively draws water from the insulated water tank 40 using capillary action and centrifugal force, eliminating the need for independent external water supply pipelines and pumps, resulting in a simpler structure. Compared to spraying water onto the bottom surface of the plate using nozzles arranged between rollers, in this scheme, the low-temperature cooling water 41 seeps out from the inner layer 33 and directly forms a liquid film in the contact area. The distribution of the liquid film depends only on the gradient seepage density of the outer layer 33 itself, unaffected by nozzle splashing, backflow interference, or scaling and clogging, which helps maintain consistent cooling during long-term operation. Compared to indirect cooling with internally circulated sealed water-cooled rollers, this scheme uses liquid film (liquid thin film) evaporation cooling instead of contact heat conduction. The heat transfer coefficient of liquid film evaporation is approximately 5000-50000 W / (m²·K), far exceeding the heat transfer coefficient of contact heat conduction (approximately 500-1500 W / (m²·K)). With a heat transfer coefficient of W / (m²·K), it can remove more heat under the same temperature difference. Compared with immersion cooling, in this scheme, the inner water storage layer 32 and the outer water seepage layer 33 are only partially immersed in the low temperature cooling water 41. The brass plate 60 receives liquid film evaporation cooling in the non-immersion area at the top of the transmission roller 30. It is conveyed in a non-immersion state throughout the process, with low conveying resistance and controllable liquid volume on the plate surface. This avoids the liquid film thickness being too thick, which affects evaporation and heat dissipation. Moreover, the heat transfer coefficient of liquid film evaporation is about 5000-50000 W / (m²·K), which is higher than the heat transfer coefficient of immersion cooling, which is about 500-5000 W / (m²·K).

[0044] Please see Figure 4 and Figure 5 In some embodiments of this application, the water-permeable outer layer 33 includes a first density portion 331, a second density portion 332, and a third density portion 333 disposed along the axial direction of the roller shaft 31. The first density portion 331 is located in the middle of the water-permeable outer layer 33. There are two second density portions 332, located at both ends of the first density portion 331, and there are two third density portions 333, located at both ends of the water-permeable outer layer 33 along the axial direction. The two second density portions 332 are respectively located between adjacent first density portions 331 and adjacent third density portions 333. The second density portions 332, the first density portions 331, and the third density portions 333 respectively form a split structure.

[0045] It is understood that the first density section 331, the second density section 332, and the third density section 333 are all annular sleeve structures, with the same inner and outer diameters. When they are joined end-to-end in the axial direction, they together form the complete cylindrical outer circumference of the water-permeable outer layer 33. The outer circumferences of the first density section 331, the second density section 332, and the third density section 333 respectively form contact areas with the bottom surface of the brass plate 60. The water permeability density of the first density section 331 is greater than that of the second density section 332, and the water permeability density of the second density section 332 is greater than that of the third density section 333. Water permeability density refers to the volume of low-temperature cooling water 41 per unit area per unit time that permeates through the water-permeable outer layer 33.

[0046] In this embodiment, the water-permeable outer layer 33 adopts a segmented structure. By setting three density sections with different water permeability along the axial direction, a gradient decrease in water permeability from the inside to the outside is achieved. The first density section 331 corresponds to the central region of the brass plate 60. This region has the highest temperature and the most concentrated heat during the molding process, requiring the greatest cooling intensity. Therefore, the first density section 331 has the highest water permeability, forming the thickest liquid film. The third density section 333 corresponds to the edge region of the brass plate 60. This region dissipates heat faster and has a lower temperature, requiring the least cooling intensity. Therefore, the third density section 333 has the lowest water permeability, forming the thinnest liquid film. The second density section 332 is located in the transition region between the two, with a moderate water permeability, forming a liquid film of medium thickness.

[0047] This design, with its three-tiered decreasing water density along the axial direction of the outer water-permeable layer 33, matches the temperature distribution pattern of the brass plate 60 along its width. The central region of the brass plate 60 experiences the most heat accumulation and the greatest difficulty in heat dissipation, thus requiring a higher water density for stronger evaporative cooling. Conversely, the edge regions experience less heat accumulation and easier heat dissipation, requiring a lower water density for weaker evaporative cooling. This gradient cooling method passively and adaptively adjusts the cooling intensity based on the temperature differences between different regions of the brass plate 60, eliminating the need for external sensors or control systems and resulting in a simple and reliable structure.

[0048] Of course, in some other embodiments, the number of density sections of the water-permeable outer layer 33 may not be three, but may be set to two, four or more sections according to the width of the brass plate 60 and the temperature distribution characteristics, with the water permeability of each section decreasing along the axial direction or changing according to other rules.

[0049] In some embodiments of this application, the difference in water permeation density between the first density portion 331 and the second density portion 332 is equal to the difference in water permeation density between the second density portion 332 and the third density portion 333, that is, the water permeation density decreases arithmetically along the axial direction. This arrangement ensures that the water permeation density changes uniformly and smoothly at all positions along the axial direction of the outer water permeation layer 33, and the liquid film thickness also decreases arithmetically along the axial direction. This helps to avoid abrupt changes in liquid film thickness caused by sudden changes in water permeation density, forming a smooth transition cooling effect between different areas of the brass plate 60 and reducing the possibility of cooling stress concentration.

[0050] Optionally, the porosity of the first density portion 331 can be 12% to 15%, the porosity of the second density portion 332 can be 8% to 11%, and the porosity of the third density portion 333 can be 5% to 7%.

[0051] Please continue reading. Figure 5 In some embodiments of this application, the first density section 331 has a first boss 3311 at both ends, and the first boss 3311 extends from the end face of the first density section 331 along the axial direction of the roller 31 toward the second density section 332. The end face of the second density section 332 facing the first density section 331 has a first groove 3301, and the first bosses 3311 at both ends of the first density section 331 are respectively inserted into the first grooves 3301 of the corresponding second density section 332. The second density section 332 has a second boss 3321 at one end, and the second boss 3321 extends from the end face of the second density section 332 along the axial direction of the roller 31 toward the third density section 333. The end face of the third density section 333 facing the second density section 332 has a second groove 3302, and the second boss 3321 of the second density section 332 is inserted into the second groove 3302 of the corresponding third density section 333.

[0052] It is understood that both the first boss 3311 and the second boss 3321 are annular protrusions extending axially at one end, and both the first groove 3301 and the second groove 3302 are annular recesses extending axially at the other end. Adjacent density sections are connected by the interlocking fit of the bosses and grooves, allowing each density section to be manufactured independently before assembly. The split structure allows each density section to be manufactured using different material formulations or sintering processes, achieving the required porosity and permeability density respectively, resulting in a simple manufacturing process and lower cost.

[0053] This design, with a separate connection structure of bosses and grooves between the first density section 331, the second density section 332, and the third density section 333, rather than being integrally formed, facilitates independent control and adjustment of porosity for each density section. Compared to the complex gradient porosity control process required for integral sintering, the separate structure allows each density section to be manufactured separately using material formulations and sintering processes best suited to its target porosity, reducing manufacturing difficulty and cost while ensuring the consistency and controllability of permeability density in each section.

[0054] In some embodiments of this application, the first boss 3311 and the second boss 3321 are both annular structures of the same size, and the first groove 3301 and the second groove 3302 are both annular grooves. The radially away side of the annular groove from the roller shaft 31 is a conical surface. An annular gap that gradually decreases from the center to both ends along the roller shaft 31 is formed between the outer peripheral surface of the first boss 3311 and the conical surface of the first groove 3301, constituting a first water replenishment cavity 302 whose volume gradually decreases from the center to both ends along the roller shaft 31. An annular gap that gradually decreases from the center to both ends along the roller shaft 31 is formed between the outer peripheral surface of the second boss 3321 and the conical surface of the second groove 3302, constituting a second water replenishment cavity 303 whose volume gradually decreases from the center to both ends along the roller shaft 31. The radially close side of the annular groove to the roller shaft 31 is a cylindrical surface, and the cylindrical surface abuts against the outer peripheral surfaces of the corresponding first boss 3311 and second boss 3321.

[0055] It is understandable that, since the diameter of the conical surface gradually changes axially on the side radially away from the roller shaft 31, while the outer diameter of the first boss 3311 is constant, the width of the annular gap between the conical surface and the outer circumferential surface of the first boss 3311 gradually changes axially, forming a first water replenishment cavity 302 with gradually changing volume. The cylindrical surface of the annular groove on the side radially close to the roller shaft 31 abuts against the outer circumferential surface of the boss, playing a role in radial positioning and support, ensuring coaxiality between adjacent density sections, and forming a closed boundary on the other side of the water replenishment cavity, so that the low-temperature cooling water 41 is confined to the water replenishment cavity on the side of the conical surface for flow and storage.

[0056] In this embodiment, the first water replenishment chamber 302 and the second water replenishment chamber 303 provide a gradually transitioning water flow channel at the junction of adjacent density sections. Due to the difference in permeation density between adjacent density sections, if the first density section 331 and the second density section 332, or the second density section 332 and the third density section 333, are directly adjacent at the junction interface, the permeation density changes abruptly in a stepwise manner on both sides of the junction interface. When the low-temperature cooling water 41 seeping out from the high permeation density area flows to the low permeation density area, the liquid film is easily interrupted at the interface, resulting in a discontinuous low-temperature cooling water 41 film on the surface of the brass plate 60 at that location. The first water replenishment chamber 302 and the second water replenishment chamber 303 utilize their annular gap structure with a volume that gradually changes along the axial direction. The low-temperature cooling water 41 ring formed at the junction of adjacent density sections has a thickness that gradually changes along the axial direction. The water ring with the gradually thickened thickness smoothly connects with the liquid film that seeps out from the density sections on both sides, so that the liquid film can smoothly transition at the density transition point rather than a step-like abrupt change. This helps to eliminate the liquid film interruption caused by the abrupt change in seepage density, and makes the low-temperature cooling water 41 film continuously distributed on all parts of the brass plate 60.

[0057] In some embodiments of this application, the volume of the first water replenishment cavity 302 is equal to the volume of the second water replenishment cavity 303, which is beneficial to have a consistent smooth transition capability of liquid film at the density transition area between the first density portion 331 and the second density portion 332, and at the density transition area between the second density portion 332 and the third density portion 333, so that the low-temperature cooling water 41 film on the surface of the brass plate 60 is continuously distributed in each transition area.

[0058] Of course, in some other embodiments, the difference in water density between the first density section 331 and the second density section 332 can be greater than the difference in water density between the second density section 332 and the third density section 333, simply by making the volume of the first water replenishment cavity 302 greater than the volume of the second water replenishment cavity 303. Similarly, the difference in water density between the first density section 331 and the second density section 332 can be less than the difference in water density between the second density section 332 and the third density section 333, simply by making the volume of the first water replenishment cavity 302 less than the volume of the second water replenishment cavity 303, so that the liquid film can smoothly transition at the density transition point rather than a step-like abrupt change. This is beneficial to eliminate the liquid film interruption caused by the abrupt change in water density, so that the low-temperature cooling water 41 film is continuously distributed throughout the surface of the brass plate 60. By changing the size of the first water replenishment cavity 302 and the second water replenishment cavity 303, the first density section 331, the second density section 332 and the third density section 333 of different densities can be adapted, reducing the limitations of the materials used in each density section.

[0059] Optionally, the axial extension length of the first boss 3311 can be 3mm to 6mm. The half-angle of the tapered surface of the first groove 3301 can be 3 degrees to 8 degrees. For example, the volume of the first water replenishment cavity 302 can be 0.5ml to 2ml.

[0060] Please continue reading. Figure 5 and Figure 6 In some embodiments of this application, a plurality of annular grooves 3201 are formed on the outer peripheral surface of the water-retaining inner layer 32. These annular grooves 3201 are spaced apart along the axial direction of the roller shaft 31. The groove wall of each annular groove 3201 and the inner wall of the permeable outer layer 33 enclose a water-retaining cavity 301. The depth of the annular grooves 3201 gradually decreases from the middle to both ends of the water-retaining inner layer 32; that is, the annular grooves 3201 located in the middle of the water-retaining inner layer 32 have the greatest depth, while the annular grooves 3201 located at both ends of the water-retaining inner layer 32 have the smallest depth. This arrangement results in the volume of the water-retaining cavity 301 gradually decreasing from the middle to both ends along the axial direction of the roller shaft 31. The larger water storage chamber 301 in the middle can store more low-temperature cooling water 41, providing a more sufficient supply of low-temperature cooling water 41 to the water-permeable outer layer 33 in the middle region, meeting the demand for greater cooling intensity in the middle region of the plate; the smaller water storage chambers 301 at both ends store relatively less low-temperature cooling water 41, which matches the demand for less cooling intensity in the edge region of the plate.

[0061] It is understandable that the design of the water storage chamber 301 increases the water storage space between the inner water storage layer 32 and the inner wall of the outer seepage layer 33. After the low-temperature cooling water 41 enters the water storage chamber 301 through the end ring 321 and porous network structure of the inner water storage layer 32, it forms a stable ring of low-temperature cooling water 41 within the water storage chamber 301, providing a continuous and uniform supply of low-temperature cooling water 41 to the outer seepage layer 33. The gradient design of the water storage chamber 301's volume ensures that the total amount of low-temperature cooling water 41 available in the central region is greater than that in the two end regions, thereby achieving differentiated control of the seepage volume at different axial positions during the seepage process.

[0062] Optionally, the cross-sectional shape of the annular groove 3201 can be trapezoidal. For example, the depth of the annular groove 3201 in the middle of the water storage inner layer 32 can be 3mm to 5mm, the depth of the annular grooves 3201 at both ends can be 0.5mm to 1.5mm, the width of the annular groove 3201 can be 5mm to 8mm, and the spacing between adjacent annular grooves 3201 can be 3mm to 5mm.

[0063] Of course, in some other embodiments, the water storage inner layer 32 may not have an annular groove 3201, but the distribution of low-temperature cooling water 41 may be adjusted by controlling the porosity along the axial gradient during the preparation of porous materials.

[0064] The inner water-retaining layer 32 forms an annular flange 322 between two adjacent annular grooves 3201, and multiple annular flanges 322 are arranged at intervals along the axial direction of the roller shaft 31. The annular flange 322 corresponding to the connection between the first density section 331 and the second density section 332 abuts against the inner circumferential surface of the connection, and the annular flange 322 corresponding to the connection between the second density section 332 and the third density section 333 abuts against the inner circumferential surface of the connection. With this arrangement, the annular flanges 322 provide radial support at the connection between adjacent density sections, which helps to enhance the overall structural stability of each density section of the water-permeable outer layer 33 after assembly.

[0065] It is understood that the annular flange 322 is located on the outer peripheral surface of the water-retaining inner layer 32, and is formed between adjacent annular grooves 3201. The cross-section of the annular flange 322 can be trapezoidal, and the position of each annular flange 322 is axially aligned with the connection between the density sections. The outer peripheral surface of the annular flange 322 abuts against the inner peripheral surface of the connection between adjacent density sections, and applies a supporting force to the connection of the water-permeable outer layer 33 in the radial direction, which helps to prevent the density sections from radially shifting or loosening due to centrifugal force or the load of the brass plate 60 during the rotation of the drive roller 30.

[0066] Please see Figure 6 In some embodiments of this application, the water-retaining inner layer 32 is provided with end ring portions 321 at both ends, and the end ring portions 321 are annular end face regions of the water-retaining inner layer 32 at both axial ends. The outer peripheral surface of the end ring portion 321 abuts against the inner peripheral surface of the end of the third density portion 333 facing away from the second density portion 332. The width of the end ring portion 321 can be 5% to 10% of the total length of the water-retaining inner layer 32.

[0067] With this configuration, when the drive roller 30 rotates, the end ring 321 of the water storage inner layer 32 is periodically immersed in the low-temperature cooling water 41 of the heat preservation water tank 40 during the rotation process. The low-temperature cooling water 41 enters the internal porous network of the water storage inner layer 32 through the end ring 321 and diffuses from the end ring 321 along the axial direction to the central region of the water storage inner layer 32. This helps the water storage inner layer 32 to always maintain a saturated water absorption state, ensuring a stable supply of low-temperature cooling water 41 to the water seepage outer layer 33, and reducing the possibility of the liquid film thinning or even interruption due to insufficient water absorption of the water storage inner layer 32.

[0068] In some embodiments of this application, threaded end caps are installed at both ends of the roller shaft 31, and the water-permeable outer layer 33 and the water-retaining inner layer 32 are fixed to the roller shaft 31 by the threaded end caps. Specifically, the threaded end caps are connected to the ends of the roller shaft 31 by threaded engagement. After tightening, the end face of the threaded end cap presses against the axial end faces of the water-permeable outer layer 33 and the water-retaining inner layer 32, thereby axially fixing the water-permeable outer layer 33 and the water-retaining inner layer 32.

[0069] It is understandable that the threaded end cap fixing method facilitates the disassembly and maintenance of the water-permeable outer layer 33 and the water-retaining inner layer 32. When it is necessary to replace the density part with different water permeability or clean the water-retaining inner layer 32, the threaded end cap can be unscrewed to remove each density part and the water-retaining inner layer 32 from the roller 31 in sequence.

[0070] Of course, in some other embodiments, the roller 31 and the inner water-retaining layer 32 can also be interference-fitted, and the inner water-retaining layer 32 and the outer water-permeable layer 33 can also be interference-fitted, achieving axial and circumferential fixation through the frictional force generated by the interference fit. Both threaded end cap fixing and interference fit can be used individually or in combination to enhance the reliability of the fixation.

[0071] This configuration, by using threaded end caps or interference fits to axially fix the water-permeable outer layer 33 and the water-retaining inner layer 32 onto the roller shaft 31, helps the three-layer structure maintain synchronous rotation and axial position stability during the transmission roller 30 carrying the brass plate 60 and rotating and conveying it. It also reduces the possibility that the water-permeable outer layer 33 and the water-retaining inner layer 32 may affect the uniform seepage effect of the low-temperature cooling water 41 due to axial movement or relative slippage.

[0072] Please continue reading. Figures 1 to 3 In some embodiments of this application, the brass plate water-cooled forming apparatus 100 with uniform cooling function further includes a spray assembly 50. The spray assembly 50 is disposed on the side of the drive roller 30 facing away from the heat preservation water tank 40, that is, above the drive roller 30, and is used to spray low-temperature cooling water 41 obliquely downwards on the side of the brass plate 60 facing away from the water-permeable outer layer 33 in the opposite direction of the movement of the brass plate 60.

[0073] It is understood that the spray assembly 50 includes a spray pipe and multiple nozzles. The spray pipe extends axially along the drive roller 30 across the width of the brass plate 60, and the multiple nozzles are arranged at intervals along the length of the spray pipe, with the spray direction of the nozzles facing the upper surface of the brass plate 60. The spray pipe is connected to an external water supply line, which is connected to a refrigeration system. Low-temperature cooling water 41 is distributed to each nozzle through the spray pipe and then evenly sprayed onto the upper surface of the brass plate 60. During the forming process, the brass plate 60 not only experiences evaporative cooling through liquid film evaporation on its bottom surface in contact with the water-permeable outer layer 33, but its upper surface also requires cooling. The spray assembly 50 provides auxiliary spray cooling to the upper surface of the brass plate 60, forming a two-way cooling system with the evaporative cooling of the bottom surface of the water-permeable outer layer 33, which is beneficial for further improving the cooling efficiency and uniformity of the brass plate 60. The method of spraying the low-temperature cooling water 41 at an angle downwards not only reduces the possibility of splashing the low-temperature cooling water 41 caused by vertical spraying, but also breaks the vapor film generated when the low-temperature cooling water 41 comes into contact with the surface of the high-temperature brass plate 60, which is conducive to the low-temperature cooling water 41 wetting the plate surface and maintaining heat exchange efficiency.

[0074] It is understandable that the external refrigeration system can be any of the following: vapor compression refrigeration cycle system, absorption refrigeration system, or semiconductor refrigeration system, as long as it can refrigerate the low-temperature cooling water 41 inside the spray pipe.

[0075] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A water-cooled forming apparatus for brass plates with uniform cooling function, characterized in that, include: Supporting institutions; An insulated water tank is installed on the support mechanism, and the insulated water tank is used to hold low-temperature cooling water. Multiple drive rollers are arranged sequentially at intervals on the support mechanism and located above the insulated water tank; A rotation drive mechanism is installed on the support mechanism, and the power output end of the rotation drive mechanism is connected to the transmission roller to drive the transmission roller to rotate. The transmission roller includes a roller shaft, a water-retaining inner layer, and a water-permeable outer layer. The roller shaft is driven to the power output end of the rotation drive mechanism. The water-retaining inner layer is coaxially sleeved on the outer circumferential surface of the roller shaft, and the water-permeable outer layer is coaxially sleeved on the outer circumferential surface of the water-retaining inner layer. The porosity of the water-retaining inner layer is greater than that of the water-permeable outer layer. Both the water-retaining inner layer and the water-permeable outer layer are partially immersed in the low-temperature cooling water in the heat-insulating water tank, and partially above the liquid level of the low-temperature cooling water, so that the water-permeable outer layer can support the brass plate to be cooled. The low-temperature cooling water in the heat-insulating water tank enters and is distributed in the water-retaining inner layer and the water-permeable outer layer. The low-temperature cooling water in the inner water storage layer seeps out to the outer peripheral surface of the outer water-permeable layer. The outer peripheral surface of the outer water-permeable layer forms a contact area with the bottom surface of the brass plate and forms a liquid film in the contact area. The outer water-permeable layer has a water-permeable density that gradually decreases from the middle to both ends along the axial direction of the roller shaft, so that the liquid film formed in the contact area has a thickness that gradually decreases from the middle to both ends along the axial direction of the roller shaft.

2. The brass plate water-cooling forming apparatus according to claim 1, characterized in that, The water-permeable outer layer includes a first density portion, a second density portion, and a third density portion arranged along the axial direction of the roller shaft. The second density portion forms a separate structure with the first density portion and the third density portion, respectively. The first density section is located in the middle of the water-permeable outer layer; there are two second density sections, located at both ends of the first density section; there are two third density sections, located at both ends of the water-permeable outer layer along the axial direction; the two second density sections are respectively located between adjacent first density sections and adjacent third density sections; the outer peripheral surfaces of the first density section, the second density section and the third density section respectively form the contact area with the bottom surface of the brass plate; The water permeation density of the first density section is greater than that of the second density section, and the water permeation density of the second density section is greater than that of the third density section.

3. The brass plate water-cooling forming apparatus according to claim 2, characterized in that, The difference in permeation density between the first density portion and the second density portion is equal to the difference in permeation density between the second density portion and the third density portion.

4. The brass plate water-cooling forming apparatus according to claim 2, characterized in that, The first density section has a first protrusion at each end, and the first protrusion extends from the end face of the first density section along the axial direction of the roller towards the second density section; the end face of the second density section facing the first density section has a first groove, and the first protrusions at both ends of the first density section are respectively inserted into the corresponding first grooves of the second density section. The second density section has a second boss at one end, which extends from the end face of the second density section along the axial direction of the roller shaft toward the third density section; the end face of the third density section facing the end of the second density section has a second groove, and the second boss of the second density section is inserted into the corresponding second groove of the third density section.

5. The brass plate water-cooling forming apparatus according to claim 4, characterized in that, Both the first boss and the second boss are circular ring structures of the same size. Both the first groove and the second groove are annular grooves. The circumferential surface of the annular groove on the side away from the roller shaft in the radial direction is a conical surface. An annular gap is formed between the outer circumferential surface of the first boss and the conical surface of the first groove, which gradually decreases from the middle to both ends of the roller shaft, forming a first water replenishment cavity with a volume that gradually decreases from the middle to both ends of the roller shaft. An annular gap is formed between the outer circumferential surface of the second boss and the conical surface of the second groove, which gradually decreases from the middle to both ends of the roller shaft, forming a second water replenishment cavity with a volume that gradually decreases from the middle to both ends of the roller shaft. The annular groove has a cylindrical surface on one side of its radial side closest to the roller shaft, and the cylindrical surface abuts against the outer peripheral surfaces of the corresponding first boss and second boss.

6. The brass plate water-cooling forming apparatus according to claim 5, characterized in that, The volume of the first water replenishment chamber is equal to the volume of the second water replenishment chamber.

7. The brass plate water-cooling forming apparatus according to any one of claims 2 to 6, characterized in that, The outer circumferential surface of the water-retaining inner layer is provided with multiple annular grooves, which are distributed at intervals along the axial direction of the roller shaft. The groove walls of the annular grooves and the inner wall of the water-permeable outer layer enclose each other to form a water-retaining cavity. The depth of the plurality of annular grooves gradually decreases from the middle to both ends of the water storage inner layer, so that the water storage cavity has a volume that gradually decreases from the middle to both ends along the axial direction of the roller shaft; The water storage inner layer forms an annular flange between two adjacent annular grooves, and a plurality of annular flanges are arranged at intervals along the axial direction of the roller shaft; the annular flange corresponding to the connection between the first density part and the second density part abuts against the inner circumferential surface of the connection, and the annular flange corresponding to the connection between the second density part and the third density part abuts against the inner circumferential surface of the connection.

8. The brass plate water-cooling forming apparatus according to any one of claims 2 to 6, characterized in that, The inner water storage layer has end rings at both ends. The outer circumferential surface of the end ring abuts against the inner circumferential surface of the end of the third density part facing away from the second density part. The end ring is at least partially immersed in the low-temperature cooling water. When the drive roller rotates, the low-temperature cooling water in the heat preservation water tank enters the inner water storage layer through the end ring.

9. The brass plate water-cooling forming apparatus according to any one of claims 1 to 6, characterized in that, The height of the roller axis is higher than the liquid level of the low-temperature cooling water in the heat preservation water tank; The roller shaft is fitted with threaded end caps at both ends, which fix the water-permeable outer layer and the water-retaining inner layer to the roller shaft, and / or the roller shaft and the water-retaining inner layer are interference fits, and the water-retaining inner layer and the water-permeable outer layer are interference fits.

10. The brass sheet water-cooling forming apparatus according to any one of claims 1 to 6, characterized in that, The brass plate water-cooling forming device also includes a spraying assembly, which is located on the side of the transmission roller facing away from the heat-insulating water tank, and is used to spray the low-temperature cooling water obliquely downwards on the side of the brass plate facing away from the water-permeable outer layer in the opposite direction of the movement of the brass plate.

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