Processing method of double-sided polished ultrathin aluminum foil

Abstract

The invention relates to the technical field of production processes of ultrathin metal foils, in particular to a processing method of a double-sided polished ultrathin aluminum foil. Firstly, an aluminum alloy strip coil is subjected to multi-pass rolling on an aluminum foil rolling mill and is timely annealed to the expected thickness; then single aluminum foil of the same specification is rolled, and rolling oil spraying is optimized during double rolling; then rolling the coiled aluminum foil in a single pass until the set thickness is reached; dividing the aluminum foil into two single-side polished aluminum foils, and trimming the aluminum foils; and finally, finishing the single-sided light aluminum foil, and changing the surface brightness by applying force according to the material. According to the method, parameters of each link, such as single rolling pass thickness, roller roughness, coil oil spraying, finishing rolling force and the like, are accurately controlled. By means of the new finishing link, double-face smooth aluminum foil can be produced on a common rolling mill, the requirements of battery aluminum foil are met, the surface and flatness are improved, the conductivity is enhanced, the service life is prolonged, equipment transformation is small, and cost effectiveness is high.

Description

Technical Field

[0001] The invention relates to the technical field of production technology of ultra-thin metal foil, and in particular to a processing method of double-sided smooth ultra-thin aluminum foil. Background Art

[0002] In the field of aluminum foil rolling processing, traditional single-layer rolling technology has some significant limitations. First, when the aluminum foil rolling mill is only used for single-layer rolling processing, the target thickness of the aluminum foil is often equivalent to the maximum thickness that can be rolled by the rolling mill. This processing method is difficult because the rolling process needs to be precisely controlled to achieve an extremely thin thickness while maintaining the uniformity and quality of the material. Due to technical challenges, the yield rate is usually low, which not only increases production costs but also limits production efficiency. In addition, the single-layer rolling technology is prone to uneven thickness during the rolling process, resulting in unstable performance of the aluminum foil, further affecting its competitiveness in high-end applications.

[0003] Secondly, another existing technology is to roll the double-clad aluminum foil on an aluminum foil rolling mill. In theory, this method can make the thickness of the aluminum foil reach half of the maximum thickness that the rolling mill can roll. However, the aluminum foil produced by this method is only smooth on one side, and the other side is relatively rough. This single-sided smooth aluminum foil is limited in many application fields, especially in the field of new energy batteries, and this aluminum foil cannot meet the use requirements. Since new energy batteries have extremely high requirements on the surface quality of aluminum foil to ensure the performance and safety of the battery, this single-sided smooth aluminum foil cannot be used in this key field, limiting its market potential and scope of application. In addition, the double-clad rolling technology is prone to produce more waste and defective products during the production process, further increasing production costs and waste of resources.

[0004] To sum up, the existing aluminum foil rolling technology has problems such as low yield, great processing difficulty and limited product application. Technicians urgently need to develop new technologies to overcome these shortcomings in order to improve the production efficiency and quality of aluminum foil and meet the market demand for high-performance aluminum foil products. Summary of the invention

[0005] In view of the shortcomings of the current related prior art, the present invention provides a processing method for double-sided smooth ultra-thin aluminum foil. By improving the aluminum foil processing technology, double-sided smooth aluminum foil can be produced on an aluminum foil rolling mill to meet the production needs of ultra-thin aluminum foil materials such as battery aluminum foil.

[0006] To achieve the above object, the present invention provides a method for processing a double-sided smooth ultra-thin aluminum foil, the processing method comprising at least the following steps:

[0007] Step S1, rolling processing of a single-layer aluminum foil;

[0008] Step S2, rolling up the single-layer aluminum foil;

[0009] Step S3, rolling processing of double-layer aluminum foil;

[0010] Step S4, rolling the double-layer aluminum foil;

[0011] Step S5, finishing of the single-sided smooth aluminum foil.

[0012] Furthermore, in step S1, the rolling process of the single-layer aluminum foil includes the following steps: rolling the metal aluminum alloy strip on an aluminum foil rolling mill for multiple rolling processes, annealing in appropriate passes according to the material properties of the processed metal alloy, and rolling the aluminum foil again until the thickness reaches the expected processing thickness.

[0013] Furthermore, in step S2, the coiling process of the single-layer aluminum foil includes the following steps: two rolls of aluminum foil of the same thickness and material produced by the above-mentioned single-layer aluminum foil rolling process are doubled on a coiling machine, and rolling oil is sprayed between the two layers of aluminum foil during the double-coiling process.

[0014] Furthermore, in step S3, the rolling process of the double-layer aluminum foil includes the following steps: the aluminum foil after being rolled is rolled on an aluminum foil rolling mill for one pass, so that the thickness of the double-layer aluminum foil reaches a set thickness value.

[0015] Furthermore, in step S4, the coiling process of the double-layer aluminum foil includes the following steps: the aluminum foil roll after the double-layer aluminum foil rolling process is placed on a coiling machine to separate it into two rolls of single-sided smooth aluminum foil, the thickness of which is half of the target thickness of the double-layer aluminum foil rolling process, and edge trimming is performed during the coiling process.

[0016] Furthermore, in step S5, the finishing process of the single-sided smooth aluminum foil includes the following steps: the single-sided smooth ultra-thin aluminum foil after being rolled is rolled on an aluminum foil rolling mill or a finishing mill for a pass of finishing process, and different rolling forces are applied according to different materials. This process does not change the material thickness, but only changes the brightness of the aluminum foil surface.

[0017] Furthermore, the aluminum foil is rolled again until the thickness reaches the expected processing thickness of 0.012 mm; so that the thickness of the double-layer aluminum foil reaches the set thickness value of 0.012 mm.

[0018] Furthermore, during the rolling process of the single-layer aluminum foil, the material of the metal aluminum alloy strip coil is a specific aluminum alloy material suitable for the production of battery aluminum foil; during the rolling process of the single-layer aluminum foil, the number of passes of the multi-pass rolling process is determined according to the target thickness and the characteristics of the aluminum alloy material, and the thickness of the aluminum foil after the first rolling pass is controlled at 0.2-0.1mm, the thickness of the aluminum foil after the second rolling pass is controlled at 0.09-0.06mm, the thickness of the aluminum foil after the third rolling pass is controlled at 0.04-0.02mm, and the thickness of the aluminum foil after the fourth rolling pass is controlled at 0.016-0.012mm; during the rolling process of the single-layer aluminum foil, the spraying amount and spraying method of the rolling oil are optimized to ensure the uniform fitting and lubrication effect of the two layers of aluminum foil during the double-closing process, and the spraying amount is 5-15 ml per square meter of the aluminum foil surface.

[0019] Furthermore, during the finishing process of the single-sided smooth aluminum foil, the surface roughness of the working roll of the skin-finishing machine or the aluminum foil rolling mill is specially treated, and the roll roughness during single sheet rolling is 10-30μm; during the finishing process of the single-sided smooth aluminum foil, the rolling force applied according to different materials ranges from 200-360T.

[0020] Furthermore, during the rolling process of the single-layer aluminum foil, the material of the metal aluminum alloy strip coil is an aluminum alloy material suitable for battery aluminum foil production.

[0021] The present invention adopts the above technical solution, which has at least the following beneficial effects:

[0022] 1. The present invention can successfully produce aluminum foil products with double-sided smooth characteristics on ordinary aluminum foil rolling mills by adding an additional finishing process on the basis of the existing aluminum foil processing technology. This improved process flow can not only meet the production requirements of ultra-thin aluminum foil materials such as battery aluminum foil, but also significantly improve the surface quality and flatness of aluminum foil products. Such aluminum foil products have higher application value in industries such as battery manufacturing because they can provide better conductivity and longer service life.

[0023] 2. The improved process provided by the present invention also has the advantage of high cost-effectiveness, because it does not require large-scale transformation of existing rolling mill equipment. The addition of a simple finishing step can achieve product upgrading, and the processing equipment can be reused on the same line with ordinary aluminum foil processing equipment. This process not only improves the market competitiveness of aluminum foil products, but also provides new ideas and directions for the development of the aluminum foil processing industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 The present invention is a flow chart of a method for processing a double-sided smooth ultra-thin aluminum foil. DETAILED DESCRIPTION

[0026] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0027] Embodiment 1

[0028] like Figure 1 As shown, this embodiment provides a method for processing double-sided smooth ultra-thin aluminum foil, and the processing method includes at least the following steps: step S1, rolling processing of single-layer aluminum foil; step S2, rolling of single-layer aluminum foil; step S3, rolling processing of double-layer aluminum foil; step S4, rolling of double-layer aluminum foil; step S5, finishing processing of single-sided smooth aluminum foil.

[0029] In a preferred embodiment, in the rolling process of the single-layer aluminum foil in step S1 of this embodiment, the metal aluminum alloy strip is rolled on an aluminum foil rolling mill for multiple rolling processes. According to the material characteristics of the processed metal alloy, annealing treatment is performed in appropriate passes, and then rolling is performed again until the thickness of the aluminum foil reaches the expected processing thickness. For example, the aluminum foil is rolled again until the thickness reaches the expected processing thickness of 0.012 mm.

[0030] In actual production, the thickness of aluminum foil after each rolling pass in single sheet rolling has a certain range of requirements. The thickness of aluminum foil after the first rolling pass is controlled at 0.2-0.1mm, the thickness of aluminum foil after the second rolling pass is controlled at 0.09-0.06mm, the thickness of aluminum foil after the third rolling pass is controlled at 0.04-0.02mm, and the thickness of aluminum foil after the fourth rolling pass is controlled at 0.016-0.012mm. At the same time, the roughness of the roller is 10-30μm and the rolling force is 200-360T (calculated according to the typical pressure cylinder diameter of 560mm, equivalent to 7.9-14.3Mpa) in single sheet rolling. These parameters are determined based on current production experience and process requirements, which help to achieve the appropriate thickness and initial performance of aluminum foil at this stage, and cooperate with subsequent processing procedures to achieve efficient production of double-sided smooth ultra-thin aluminum foil.

[0031] In another preferred embodiment, in the step S2 of the single-layer aluminum foil rolling process, the embodiment includes double-coiling two rolls of aluminum foil of the same thickness and the same material produced by the above-mentioned single-layer aluminum foil rolling process on a coiling machine. During the double-coiling process, rolling oil is sprayed between the two layers of aluminum foil to ensure uniform lamination and lubrication of the two layers of aluminum foil during the double-coiling process. The spraying amount is 5-15 ml per square meter of aluminum foil surface.

[0032] In a further preferred embodiment, in the rolling process of the double-layer aluminum foil in step S3 of this embodiment, the aluminum foil after being rolled is rolled on an aluminum foil rolling mill for one pass, so that the thickness of the double-layer aluminum foil reaches a set thickness value. For example, the thickness of the double-layer aluminum foil reaches a set thickness value of 0.012 mm.

[0033] In another preferred embodiment, in the step S4 of the double-layer aluminum foil reeling process, the aluminum foil after the double-layer aluminum foil rolling process is rolled on a reeling machine to separate it into two rolls of single-sided smooth aluminum foil, the thickness of which is half of the target thickness of the double-layer aluminum foil rolling process. Edge trimming is performed during the reeling process to ensure the dimensional accuracy of the aluminum foil.

[0034] In a further preferred embodiment, in the step S5 of the skin-finishing process of the single-sided smooth aluminum foil, the single-sided smooth ultra-thin aluminum foil after being rolled is subjected to a skin-finishing process on an aluminum foil rolling mill or skin-finishing mill. Different rolling forces are applied according to different materials. This process does not change the material thickness, but only changes the surface brightness of the aluminum foil. For example, the rolling force applied according to different materials ranges from 200 to 360T.

[0035] In a preferred embodiment, in the rolling process of the single-layer aluminum foil in this embodiment, the material of the metal aluminum alloy strip coil is a specific aluminum alloy material suitable for the production of battery aluminum foil. The number of passes of the multi-pass rolling process is determined according to the target thickness and the characteristics of the aluminum alloy material. The thickness of the aluminum foil is controlled at 0.2-0.1mm after the first rolling pass, 0.09-0.06mm after the second rolling pass, 0.04-0.02mm after the third rolling pass, and 0.016-0.012mm after the fourth rolling pass.

[0036] In a further preferred embodiment, in the present embodiment, during the finishing process of the single-sided smooth aluminum foil, the surface roughness of the working roll of the skin-finishing machine or the aluminum foil rolling mill is specially treated, and the roll roughness is 10-30 μm during single sheet rolling; specifically, the introduction of the skin-finishing process enables the aluminum foil to undergo special surface treatment during the rolling process, effectively eliminating minor surface defects and unevenness, thereby obtaining a smoother and more uniform surface.

[0037] It should be noted that: In this embodiment, the thickness range of the above-mentioned passes is strictly controlled during the rolling of a single sheet. The thickness of the aluminum foil reaches [the specific value is between 0.2-0.1 mm] after the first rolling, the thickness of the aluminum foil reaches [the specific value is between 0.09-0.06 mm] after the second rolling, the thickness of the aluminum foil reaches [the specific value is between 0.04-0.02 mm] after the third rolling, and the thickness of the aluminum foil reaches [the specific value is between 0.016-0.012 mm] after the fourth rolling. In addition, the roughness of the roller is set to [the specific value is between 10-30 μm], and the rolling force is adjusted to [the specific value is between 200-360 T] (calculated according to the typical pressure cylinder diameter of 560 mm, the corresponding pressure is between 7.9-14.3 Mpa). Through such parameter settings, the aluminum foil can stably approach the target thickness and performance at this stage, laying a good foundation for subsequent processing procedures.

[0038] In summary, this embodiment provides an efficient and precise double-sided smooth ultra-thin aluminum foil processing method, which can meet the needs of high-precision application fields such as battery aluminum foil.

[0039] Embodiment 2

[0040] This embodiment provides a method for processing a double-sided smooth ultra-thin aluminum foil, comprising the following steps:

[0041] Step S1: rolling processing of a single-layer aluminum foil, rolling the metal aluminum alloy strip on the aluminum foil rolling mill for multiple rolling processes. During each rolling process, high-precision sensors are used to monitor the thickness, hardness, temperature and other parameters of the aluminum foil in real time, and the rolling force, rolling speed and tension are dynamically adjusted according to these real-time data through an advanced control system. For example, when it is detected that the thickness deviation of the aluminum foil exceeds a certain range, the control system will automatically increase or decrease the rolling force according to the preset algorithm to ensure the uniformity of the thickness of the aluminum foil. According to the material characteristics of the processed metal alloy, annealing treatment is performed in a specific pass that has been accurately calculated. This process strictly controls the annealing temperature and time, and the annealing temperature fluctuation range is controlled within ±5°C, and the time error does not exceed ±1 minute to optimize the internal structure of the aluminum foil. The aluminum foil is rolled again until the thickness reaches 0.012mm, and during the entire rolling process, the surface temperature fluctuation range of the aluminum foil is kept within ±3°C. The number of passes of the multi-pass rolling process is determined by an intelligent algorithm according to the target thickness and the material characteristics of the aluminum alloy, ranging from 5 to 15 times. At the same time, during single sheet rolling, the thickness of the aluminum foil is controlled at 0.2-0.1mm after the first rolling pass, 0.09-0.06mm after the second rolling pass, 0.04-0.02mm after the third rolling pass, and 0.016-0.012mm after the fourth rolling pass. The roller roughness is 10-30μm, and the rolling force is 200-360T (calculated based on the typical pressing cylinder diameter of 560mm, equivalent to 7.9-14.3Mpa).

[0042] Step S2: Rolling of single-layer aluminum foil: Roll two rolls of aluminum foil of the same thickness and material produced in step S1 on a roll-closing machine. During the rolling process, a high-precision spraying device is used to spray rolling oil between the two layers of aluminum foil in a precisely controlled manner. The spraying amount is 5-15 ml per square meter of aluminum foil surface, and the spraying angle is 30°-60° with the aluminum foil surface to ensure the uniform fit and lubrication effect of the two layers of aluminum foil during the rolling process. At the same time, advanced optical detection equipment is used to monitor the tightness of the fit between the two layers of aluminum foil in real time. Once the fit is found to be less than 98%, the double-closing process parameters are adjusted immediately. In addition, the cleanliness of the rolling oil is monitored online. When the impurity content in the rolling oil exceeds the set threshold (such as the diameter of the impurity particles is greater than 0.005mm or the impurity content accounts for more than 0.1%), the rolling oil is replaced in time to ensure the stability of the double-closing process and the quality of the aluminum foil.

[0043] Step S3: Rolling of double-layer aluminum foil, rolling the aluminum foil after coiling on the aluminum foil rolling mill for one pass. An advanced closed-loop control system is used. The system collects the thickness, pressure, speed and other parameters in the rolling process in real time through high-precision sensors, and compares them with the preset target parameters. The advanced PID algorithm is used to accurately calculate the deviation and adjust the actuator of the rolling mill in time to ensure the stability of the rolling process and product quality. For example, when it is detected that the thickness deviation of the double-layer aluminum foil exceeds ±0.002mm, the system will automatically adjust the rolling pressure and speed within 0.1 seconds to make the thickness of the double-layer aluminum foil reach 0.012mm, where the rolling speed is 500-1500 meters / minute, the rolling pressure is 80-150 MPa, and the eccentricity of the roller is kept at no more than 0.03mm during the rolling process. By strictly controlling these parameters, the rolling accuracy and quality of the double-layer aluminum foil are guaranteed.

[0044] Step S4: Double-layer aluminum foil is rolled and rolled on a roll splitter to separate it into two rolls of single-sided smooth aluminum foil with a thickness of 0.006 mm. Edge trimming is performed during the roll splitting process, and the edge trimming width is determined by an adaptive algorithm based on product specifications and quality requirements, ranging from 2 to 8 mm. During the edge trimming process, high-precision tools and advanced positioning systems are used to ensure the flatness and accuracy of the edge trimming, and the edge roughness after edge trimming is controlled between 0.05 and 0.1 μm. At the same time, the roll splitting tension is monitored in real time by a high-precision tension sensor and its fluctuation range is kept within ±5%. The roll splitting tension is automatically adjusted by an advanced tension control system to ensure the stability of the roll splitting process and the quality of the aluminum foil.

[0045] Step S5: Finishing of single-sided smooth aluminum foil. The single-sided smooth ultra-thin aluminum foil after coiling is rolled on an aluminum foil rolling mill or a skin-finishing mill for a pass of finishing. The surface roughness of the working roller of the skin-finishing mill or the aluminum foil rolling mill is specially treated to a range of 0.02-0.08 microns. The working roller is processed using advanced nano-scale surface treatment technology to ensure that its surface flatness and roughness meet extremely high precision requirements. Different rolling forces are applied through machine learning models according to different materials, ranging from 30-80 MPa. This process does not change the material thickness, but only changes the surface brightness of the aluminum foil. During the finishing process, the ambient temperature is controlled at 18-25°C, the humidity is controlled at 30%-60%, and a high-precision gloss sensor is used to monitor the brightness changes of the aluminum foil surface in real time. When the brightness reaches the preset threshold range (such as the glossiness between 80-100GU), the finishing process is stopped to ensure the consistency and high quality of the brightness of the aluminum foil surface.

[0046] As an implementation mode, the material of the metal aluminum alloy strip coil described in this embodiment is an aluminum alloy material suitable for battery aluminum foil production that contains specific trace elements and has a precisely controlled proportion. The trace elements include but are not limited to titanium, zirconium, vanadium, etc., and their content ranges are 0.01%-0.1% titanium, 0.05%-0.15% zirconium, and 0.02%-0.08% vanadium. The precise control of these trace elements plays a key role in the performance of aluminum foil. For example, titanium can improve the strength and corrosion resistance of aluminum foil, zirconium helps to refine the grain structure, and vanadium can improve the conductivity of aluminum foil. In the process of raw material preparation, advanced alloy smelting technology and composition analysis equipment are used to ensure the uniform distribution and precise proportion of trace elements.

[0047] As an implementation method, the rolling force adjustment during each rolling in step S1 described in this embodiment is calculated by a fuzzy logic control system based on the thickness deviation, hardness change and real-time monitoring of the aluminum foil after the previous rolling. The system comprehensively considers multiple factors and uses complex mathematical models and a large amount of experimental data for optimization to ensure the accuracy and timeliness of the rolling force adjustment. The rolling speed is determined by a dynamic optimization algorithm based on the rheological properties of the aluminum foil material and the performance of the equipment. The algorithm can adjust the rolling speed in real time according to the deformation of the aluminum foil during the rolling process and the operating status of the equipment to ensure the efficiency and stability of the rolling process. The tension is adjusted according to the width and thickness of the aluminum foil through a tension adaptive adjustment device. The device uses high-precision tension sensor feedback data to automatically control the size of the tension to prevent the aluminum foil from wrinkling or breaking during the rolling process.

[0048] As an implementation method, the closed-loop control system in step S3 described in this embodiment collects parameters such as thickness, pressure, speed, etc. in real time during the rolling process through high-precision sensors. These sensors have high sensitivity and high precision and can accurately measure small parameter changes. After comparing with the preset target parameters, the deviation is calculated using an advanced PID algorithm. After a large number of simulations and actual debugging, the algorithm has the characteristics of fast response and high precision, and can adjust the actuator of the rolling mill in time to ensure the stability of the rolling process and product quality. For example, during the rolling process, when the thickness deviation occurs, the PID algorithm can calculate the adjustment amount within a few milliseconds, and quickly adjust the gap and pressure of the rollers through a high-precision hydraulic or electric actuator, so that the thickness of the double-layer aluminum foil quickly returns to the set value.

[0049] As an implementation method, the adaptive algorithm in step S4 described in this embodiment determines the trimming width based on factors such as the final use of the product (such as battery positive electrode foil or negative electrode foil), customer requirements for edge flatness, and the mechanical properties of the reeling machine. For example, for battery positive electrode foil, due to its different functions in the battery and working environment, a wider trimming width may be required to ensure the stability and safety of the edge; while for negative electrode foil, on the premise of meeting basic requirements, the trimming width can be appropriately reduced to improve material utilization. At the same time, the reeling machine is equipped with an advanced dynamic tension compensation device, which uses a high-precision tension sensor and an intelligent control system to monitor and adjust the reeling tension in real time, achieve precise control of the reeling tension, and prevent deformation or damage caused by uneven tension of the aluminum foil during the reeling process.

[0050] As an implementation method, the processing method described in this embodiment is provided with an online quality detection system between each process, and a variety of advanced detection methods such as laser measurement, optical microscope, and electronic probe are used to comprehensively detect the thickness, surface roughness, flatness, chemical composition, microstructure and other parameters of the aluminum foil. For example, the thickness of the aluminum foil can be accurately measured by laser measurement technology with an accuracy of ±0.0005mm; the optical microscope can observe the surface micromorphology of the aluminum foil, detect surface defects and grain structure; the electronic probe can analyze the chemical composition and element distribution of the aluminum foil. Products that do not meet the quality requirements are adjusted or eliminated in a timely manner, and the detection data are fed back to the previous process through an advanced data analysis system for optimizing process parameters. In this way, quality monitoring and closed-loop control of the entire production process are achieved, and product quality is continuously improved.

[0051] As an implementation method, the double-sided smooth ultra-thin aluminum foil product produced by the processing method described in this embodiment has a double-sided surface roughness of less than 0.08 microns, a flatness error of no more than 0.3 mm per meter length, and excellent electrochemical properties in battery applications, such as a corrosion rate in a specific electrolyte of less than 0.03 mm / year, and an interface contact resistance with battery active materials of less than 0.08 ohms / square centimeter. These excellent properties make the aluminum foil product have extremely high application value in the field of new energy batteries, and can significantly improve the performance and life of the battery. In order to achieve these performance indicators, the process parameters of each process are strictly controlled during the production process, and advanced surface treatment and post-processing technologies are used, such as special chemical treatment after finishing, to further optimize the surface properties and electrochemical properties of the aluminum foil.

[0052] As an implementation method, the processing method described in this embodiment uses a real-time status monitoring system for the key components of the equipment (such as rollers, winding shafts, etc.) during the entire production process, and monitors the equipment operation status through various advanced monitoring methods such as vibration analysis, temperature monitoring, and wear detection. For example, a high-precision vibration sensor is used to monitor the vibration of the roller. Once the vibration amplitude exceeds the set threshold, the system will automatically alarm and analyze the cause, which may be problems such as roller imbalance or bearing wear; the temperature monitoring system can measure the temperature of key components of the equipment in real time to prevent overheating from causing equipment damage or affecting product quality; the wear detection device can detect the degree of wear of components such as rollers and winding shafts, and perform maintenance or replacement in advance according to the wear condition. By predicting equipment failures and performing maintenance in advance, the continuity and stability of the production process can be ensured, and production efficiency can be improved.

[0053] As an implementation method, in the process of rolling in step S2, the processing method described in this embodiment uses ultrasonic detection technology to monitor the tightness of the two layers of aluminum foil in real time. This technology uses the reflection and transmission characteristics of ultrasonic waves in different media to accurately measure the gap and fit between the two layers of aluminum foil to ensure that the fit reaches more than 98%. At the same time, the cleanliness of the rolling oil is monitored online, and advanced optical particle counters and chemical analysis instruments are used. When the impurity content in the rolling oil exceeds the set threshold, the rolling oil is replaced in time to ensure the purity of the rolling oil and prevent impurities from scratching or contaminating the surface of the aluminum foil, thereby ensuring the quality of the aluminum foil.

[0054] As an implementation mode, the processing method described in this embodiment performs surface treatment on the aluminum foil after the finishing process in step S5, including but not limited to coating a layer of organic protective film with a thickness of 0.001-0.005 mm, which is made of advanced polymer materials and has good corrosion resistance, flexibility and insulation. During the coating process, high-precision coating equipment is used to ensure the thickness uniformity and integrity of the protective film to further improve the performance and storage life of the aluminum foil. For example, the organic protective film can effectively prevent the aluminum foil from being corroded in a humid environment, and at the same time, it can maintain good flexibility during the winding and use of the aluminum foil, and will not break due to bending, and its insulation performance can prevent the aluminum foil from short-circuiting and other problems in battery applications.

[0055] This embodiment provides a more sophisticated and efficient double-sided smooth ultra-thin aluminum foil processing method, which can meet the needs of application fields such as battery aluminum foil that have extremely high requirements on precision and quality. While improving product quality and performance, it ensures the stability and reliability of the production process, and provides a more competitive technical solution for the development of the aluminum foil processing industry.

[0056] Embodiment 3

[0057] A method for processing a double-sided smooth ultra-thin aluminum foil, the processing method at least comprising the following steps:

[0058] Step S1, rolling processing of a single-layer aluminum foil, rolling a metal aluminum alloy strip on an aluminum foil rolling mill for multiple rolling processes, the thickness of the aluminum foil after the first rolling process is controlled to be 0.2-0.1mm, the thickness of the aluminum foil after the second rolling process is controlled to be 0.09-0.06mm, the thickness of the aluminum foil after the third rolling process is controlled to be 0.04-0.02mm, and the thickness of the aluminum foil after the fourth rolling process is controlled to be 0.016-0.012mm, annealing is performed at appropriate passes according to the material characteristics of the processed metal alloy, and the aluminum foil is rolled again until the thickness reaches the expected processing thickness, and during the entire rolling process, the roller roughness is 10-30μm when rolling a single sheet, and the rolling force is 200-360T;

[0059] Step S2, rolling the single-layer aluminum foil, rolling two rolls of aluminum foil of the same thickness and material produced by the above-mentioned single-layer aluminum foil rolling process on a rolling machine, spraying rolling oil between the two layers of aluminum foil during the rolling process, with a spraying amount of 5-15 ml per square meter of aluminum foil surface;

[0060] Step S3, rolling the double-layer aluminum foil, rolling the aluminum foil after winding on an aluminum foil rolling mill for one pass, so that the thickness of the double-layer aluminum foil reaches a set thickness value;

[0061] Step S4, splitting the double-layer aluminum foil, rolling the double-layer aluminum foil on a splitting machine to split it into two rolls of single-sided smooth aluminum foil, the thickness of which is half of the target thickness of the double-layer aluminum foil rolling process, and trimming is performed during the splitting process;

[0062] Step S5, finishing of single-sided smooth aluminum foil, the single-sided smooth ultra-thin aluminum foil after coiling is rolled on an aluminum foil rolling mill or a skin-finishing mill for a pass of finishing processing, and different rolling forces are applied according to different materials. This process does not change the material thickness, but only changes the surface brightness of the aluminum foil. The surface roughness of the working roller of the skin-finishing mill or the aluminum foil rolling mill is 10-30μm when a single sheet is rolled.

[0063] Although the embodiments of the present invention have been shown and described above, it will be appreciated that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, substitute and vary the above embodiments within the scope of the present invention.

Claims

1. A method for processing double-sided smooth ultra-thin aluminum foil, characterized in that: The processing method at least comprises the following steps: Step S1, rolling processing of a single-layer aluminum foil; Step S2, rolling up the single-layer aluminum foil; Step S3, rolling processing of double-layer aluminum foil; Step S4, rolling the double-layer aluminum foil; Step S5, finishing of the single-sided smooth aluminum foil.

2. The processing method according to claim 1, characterized in that: In step S1, the rolling process of the single-layer aluminum foil includes the following steps: rolling the metal aluminum alloy strip on an aluminum foil rolling mill for multiple rolling processes, annealing in appropriate passes according to the material properties of the processed metal alloy, and rolling the aluminum foil again until the thickness reaches the expected processing thickness.

3. The processing method according to claim 2, characterized in that: In step S2, the coiling process of the single-layer aluminum foil includes the following steps: two rolls of aluminum foil of the same thickness and material produced by the above-mentioned single-layer aluminum foil rolling process are doubled on a coiling machine, and rolling oil is sprayed between the two layers of aluminum foil during the double-coiling process.

4. The processing method according to claim 3, characterized in that: In step S3, the rolling process of the double-layer aluminum foil includes the following steps: the aluminum foil after being rolled is rolled on an aluminum foil rolling mill for one pass, so that the thickness of the double-layer aluminum foil reaches a set thickness value.

5. The processing method according to claim 4, characterized in that: In step S4, the coiling process of the double-layer aluminum foil includes the following steps: the aluminum foil roll after the double-layer aluminum foil rolling process is rolled on a coiling machine to separate it into two rolls of single-sided smooth aluminum foil with a thickness of half of the target thickness of the double-layer aluminum foil rolling process, and edge trimming is performed during the coiling process.

6. The processing method according to claim 5, characterized in that: In step S5, the finishing process of the single-sided smooth aluminum foil includes the following steps: the single-sided smooth ultra-thin aluminum foil after being rolled is rolled on an aluminum foil rolling mill or a finishing mill for a pass of finishing process, and different rolling forces are applied according to different materials. This process does not change the material thickness, but only changes the brightness of the aluminum foil surface.

7. The processing method according to any one of claims 1 to 6, characterized in that: The aluminum foil is rolled again until the thickness reaches the expected processing thickness of 0.012 mm; the thickness of the double-layer aluminum foil reaches the set thickness value of 0.012 mm.

8. The processing method according to claim 7, characterized in that: During the rolling process of the single-layer aluminum foil, the material of the metal aluminum alloy strip coil is a specific aluminum alloy material suitable for the production of battery aluminum foil; During the rolling process of the single-layer aluminum foil, the number of passes of the multi-pass rolling process is determined according to the target thickness and the material properties of the aluminum alloy; the thickness of the aluminum foil after the first rolling pass is controlled to be 0.2-0.1 mm, the thickness of the aluminum foil after the second rolling pass is controlled to be 0.09-0.06 mm, the thickness of the aluminum foil after the third rolling pass is controlled to be 0.04-0.02 mm, and the thickness of the aluminum foil after the fourth rolling pass is controlled to be 0.016-0.012 mm; During the rolling process of the single-layer aluminum foil, the spraying amount and spraying method of the rolling oil are optimized to ensure the uniform fitting and lubrication effect of the two layers of aluminum foil during the double rolling process, and the spraying amount is 5-15 ml per square meter of the aluminum foil surface.

9. The processing method according to claim 8, characterized in that: During the finishing process of the single-sided smooth aluminum foil, the surface roughness of the working roll of the skin-finishing machine or the aluminum foil rolling mill is specially treated, and the roll roughness is 10-30μm during single sheet rolling; during the finishing process of the single-sided smooth aluminum foil, the rolling force applied according to different materials ranges from 200-360T.

10. The processing method according to any one of claims 1 to 6 or any one of claims 8 to 9, characterized in that: During the rolling process of the single-layer aluminum foil, the material of the metal aluminum alloy strip coil is an aluminum alloy material suitable for battery aluminum foil production.

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