Four-point-five-micron ultra-thin aluminum foil double-rolling process

Abstract

The present application belongs to the technical field of metal calendering, and relates to a 4.5-micron ultra-thin aluminum foil double-rolling process, which comprises the following steps: rough medium rolling of two cast-rolled raw materials, stacking and rolling of two stacked foil rolls with the same width and different thicknesses by means of a finishing rolling mill equipped with double unwinders, wherein the aluminum foil of the stacked foil roll 1 is attached to the upper surface of the single foil of the stacked foil roll 2, and the two are sent into the finishing rolling mill after being stacked and rolled, and the stacked material roll is formed at the winding roll, the two stacked material rolls with different thicknesses at the winding roll are cut by means of a slitting machine, and upper winding and lower winding with different thicknesses are formed; the winding is reversed and cut, annealing and packaging are performed, and the finished product is obtained. The present application breaks through the limitation of the installation precision of domestic rolling mills, possibly increases the process cost of the secondary winding-reversing and cutting process, and reduces the yield, but realizes the production of ultra-thin 4.5-micron aluminum foil by means of domestic rolling mills, and makes the comprehensive yield and quality of the 4.5-micron aluminum foil reach the process level of the original imported rolling mill.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of metal calendering, and relates to aluminum foil processing, in particular to a four-point-five-micron (4.5 μm) ultra-thin aluminum foil double-rolling process. BACKGROUND

[0002] Aluminum foil generally refers to a rolled aluminum product with a thickness less than 0.2 mm and a rectangular cross section. It is widely used in food, medicine, power capacitors and other fields in the national economy and daily life due to its light weight, good sealing and wrapping properties, high electrical conductivity and other advantages. Considering the cost factor, the thickness of aluminum foil is developing towards thinner and more economical types, especially for aluminum foil used in power capacitors, which conforms to the development trend of electronic components towards smaller size and larger capacity. The thickness of aluminum foil used in power capacitors is generally below 5.5 μm, and ultra-thin capacitor aluminum foil is below 4.5 μm.

[0003] Aluminum foil production mainly uses four-roller rolling mills, and a few use six-roller rolling mills. Aluminum foil blanks of a certain thickness are produced through calendering processes such as rough rolling, intermediate rolling and finish rolling to obtain the desired finished product thickness.

[0004] It is difficult to stably produce aluminum foil below 0.01 mm through direct rolling, and thinner double-zero aluminum foil is currently generally obtained by stacking and rolling two aluminum foils of the same thickness. Double-rolling is a conventional process for producing double-zero aluminum foil, which not only facilitates the production of double-zero aluminum foil, but also improves production efficiency. After stacking and rolling, the aluminum foils are separated by a slitting machine to obtain the desired aluminum foil.

[0005] With the improvement of industry installation level and metallurgical technology, the aluminum foil industry can generally smoothly produce aluminum foil above 6 μm through stacking and rolling. The production of aluminum foil has broken through the original technical barriers, and the production of ultra-thin aluminum foil has also become possible. To meet the demand for smaller size and larger capacity of capacitor foils for electronic components, aluminum foils with thicknesses of 5.5 μm, 5 μm and 4.5 μm have appeared in succession, and even there is a demand for 4 μm thickness.

[0006] Capacitor foil is a high-value-added product, especially 4.5 μm ultra-thin capacitor foil, although the market demand is not as large as 5 μm and 5.5 μm, but the product has a high cost performance, and there are very few domestic enterprises that can stably provide 4.5 μm. This leads to a shortage of 4.5 μm ultra-thin aluminum foil. The main reason is that ultra-thin 4.5 μm capacitors are difficult to produce on wide rolling mills, and narrow rolling mills are mostly domestic, with insufficient installation precision and poor production stability, resulting in low yield. Limited by the installation precision of domestic rolling mills, when producing aluminum foil below 5 μm using the traditional double-rolling process, phenomena such as unstable plate shape, frequent breakage and wrinkling of the coiled material surface often occur, making it impossible to stably produce 4.5 μm aluminum foil. SUMMARY

[0007] In view of the deficiencies in the prior art, the purpose of the present application is to disclose a 4.5 μm ultra-thin aluminum foil double-accumulative-rolling process.

[0008] A 4.5 μm ultra-thin aluminum foil double-accumulative-rolling process, comprising the following steps:

[0009] Step 1, rough intermediate rolling

[0010] Accumulative-rolling roll 1: cast-rolling stock with a thickness of 0.24 mm ± 3%, referred to as roll 1, is rolled by 2 passes of rough rolling and 1 pass of intermediate rolling to a single foil with a thickness of 0.012 mm, with the pass distribution being 0.24 mm→0.09 mm→0.032 mm→0.012 mm;

[0011] The parameters of the working rolls used in the accumulative-rolling roll 1 are as follows:

[0012] The first pass of rough rolling adopts a roughness Ra: 0.32-0.35 μm, a convexity Cr: 40-56 ‰, and a target plate shape curve value -40I;

[0013] The second pass of rough rolling is the same as the first pass, with a target plate shape curve value -36I;

[0014] The third pass of intermediate rolling adopts a roughness Ra: 0.09-0.10 μm, a convexity Cr: 36-50 ‰, and a target plate shape curve value -32I,

[0015] Accumulative-rolling roll 2: cast-rolling stock with a thickness of 0.24 mm ± 3% and the same width as roll 1, referred to as roll 2, is rolled as a double-accumulative-rolling roll with roll 1 by 2 passes of rough rolling and 1 pass of intermediate rolling to a single foil with a required thickness,

[0016] The parameters of the working rolls used in the accumulative-rolling roll 2 are as follows:

[0017] The first pass of rough rolling adopts a roughness Ra: 0.32-0.35 μm, a convexity Cr: 40-56 ‰, and a target plate shape curve value -40I;

[0018] The second pass of rough rolling is the same as the first pass, with a target plate shape curve value -36I;

[0019] The third pass of intermediate rolling adopts a roughness Ra: 0.1-0.12 μm, a convexity Cr: 36-50 ‰, and a target plate shape curve value -32I;

[0020] Step 2, the two accumulative-rolling foil rolls with the same width and different thicknesses obtained are subjected to accumulative rolling by a finishing rolling mill equipped with double unwinders, wherein the aluminum foil of the accumulative-rolling roll 1 is attached to the upper surface of the single foil of the accumulative-rolling roll 2, and the two are combined and sent to the finishing rolling mill for rolling, and a rolled material roll is formed at the outlet of the rolling mill, wherein the 4.5 μm ultra-thin aluminum foil is obtained after the accumulative rolling of the accumulative-rolling roll 1;

[0021] The roughness Ra of the finishing roll used is 0.05-0.06 μm, the convexity Cr is 36-50‰, and the target plate shape curve value is -26I;

[0022] Step 3, the two different thicknesses of the laminated material rolls in the winding rolls are cut on a slitting machine to form upper winding and lower winding with different thicknesses;

[0023] If the two final required product widths are consistent, the products are obtained after slitting;

[0024] If the two final required product widths are inconsistent, then:

[0025] Step 4, the obtained upper winding and lower winding are respectively wound on a rewinding machine, annealed and packaged to obtain the products.

[0026] In the preferred disclosure of the present application, in step 1, the aluminum alloy type of the roll 1 is 1235H14, and the aluminum alloy type of the raw material laminated with the 4.5 μm ultra-thin aluminum foil is 1235H14 or 8079H14, preferably 1235H14. The consistency of plasticity of the two rolls of aluminum foil during calendering has a great influence on the stability of the rolling process and the number of pinholes of the ultra-thin aluminum foil, and the aluminum alloy type of the 4.5 μm ultra-thin aluminum foil is 1235H14.

[0027] The convexity of the rolling roll is different according to the width of the raw material, small convexity is used for narrow material, and large convexity is used for wide material, so as to compensate for the increased roll disturbance.

[0028] In the preferred disclosure of the present application, in step 1, the pass distribution of the roll 2 is determined according to the product thickness, when,

[0029] The pass distribution matched with the product thickness of 5.5 μm is 0.24 mm→0.092 mm→0.036 mm→0.014 mm, and 5.5 μm is prepared after laminating,

[0030] The pass distribution matched with the product thickness of 6.0 μm is 0.24 mm→0.092 mm→0.04 mm→0.016 mm, and 6.0 μm is prepared after laminating,

[0031] The pass distribution matched with the product thickness of 6.5 μm is 0.24 mm→0.095 mm→0.044 mm→0.0175 mm, and 6.5 μm is prepared after laminating.

[0032] In the preferred disclosure of the present application, in step 1, the roughness Ra of the support roll used in roughing is 0.5-0.6 μm, the convexity Cr is 20‰, and the inlet tension of the roughing pass is required to be ≤50 N / mm 2 .

[0033] The aluminum foil rolling process in step 2 belongs to a physical change: in unit time, the inlet volume of the superimposed aluminum foil is the same as the outlet volume. According to this principle, the rolling thickness of the ultra-thin aluminum foil prepared by the present application is from 0.012 mm to 0.0045 mm, and the inlet thickness of the other one of the double superimposed rolling follows the calculation of the pass reduction rate from 0.012 mm to 0.0045 mm. For example, the superimposed 0.0055 mm, according to the pass reduction rate of 0.012 mm to 0.0045 mm, the single thickness of 0.0055 mm requires 0.014 mm. When superimposed: the total inlet thickness is 0.026 mm (0.014 mm + 0.012 mm), the target outlet thickness is set to 0.01 mm (0.0055 mm + 0.0045 mm), thereby obtaining two kinds of thickness aluminum foil of 4.5 μm and 5.5 μm.

[0034] In the preferred disclosure of the present application, in step 2, the thickness of the other one of the finished products superimposed with the 4.5 μm ultra-thin aluminum foil is not more than 6.5 μm. Since the double combined surface (also known as the matte surface) of the two superimposed aluminum foils does not directly contact the roller, the superimposed double combined surface belongs to free deformation; practice shows that when the finished product thickness of the superimposed roll 2 exceeds 7 μm, the number of pinholes of the ultra-thin aluminum foil 4.5 μm increases exponentially, the production process increases, and the slitting is difficult.

[0035] In the preferred disclosure of the present application, in step 2, the roughness Ra of the support roller of the finishing mill is 0.5-0.6 μm, and the crown Cr is 20 ‰; the inlet unit tension of the superimposed double sheet is ≤50 N / mm 2 .

[0036] In the preferred disclosure of the present application, in step 3, double combined oil is added between the two superimposed aluminum foils through the oil dropping nozzle beam (1), and the double combined oil is uniformly mixed by 80# base oil and 5-10% additive STE6 by mass percentage. The double combined surface is lubricated by the oil dropping nozzle beam, which effectively prevents the adhesion of the double combined surface; wherein the additive STE6 is a product of Shijiazhuang Xintai Special Oil Co., Ltd.

[0037] In the preferred disclosure of the present application, in step 3, the cutting process needs to cut off the two sides and wind into the same width of the upper winding and the lower winding.

[0038] In the technical solution given by the present application, the specific process for preparing 4.5 μm ultra-thin aluminum foil is given by superimposed roll 1, and 4.5 μm ultra-thin aluminum foil can also be prepared by superimposed roll 2. The relevant process parameters can be adjusted by the person skilled in the art according to the specific content of the present application.

[0039] Limited by the installation precision of domestic rolling mill, the application breaks the traditional production process of using the same thickness of aluminum foil to obtain the same thickness of aluminum foil by stacking and rolling, and uses different thickness of aluminum foil to produce, according to the same reduction principle, by controlling the inlet thickness, two different thickness of finished aluminum foil is obtained, which opens up a new technical route for the production of ultra-thin 4.5μm aluminum foil.

[0040] Advantages

[0041] In order to overcome the limitation of the installation precision of domestic rolling mill and enable the domestic rolling mill to stably produce ultra-thin aluminum foil, the application uses two different thickness of aluminum foil to stack and roll to obtain two different thickness of double zero aluminum foil. If the width of the two finished products is inconsistent, it is necessary to separately perform the reverse winding and cutting to obtain the aluminum foil specifications required by each finished product. The application breaks through the limitation of the installation precision of domestic rolling mill, realizes the stable production of ultra-thin 4.5μm aluminum foil by domestic rolling mill, although it may increase the process cost of secondary reverse winding and cutting and reduce the production efficiency, but it realizes the breakthrough of domestic rolling mill in producing ultra-thin 4.5μm, and makes the comprehensive yield and quality of 4.5μm reach the process level of the original imported rolling mill. It opens up the bottleneck of ultra-thin aluminum foil capacity, improves the competitiveness of ultra-thin power capacitor aluminum foil market, and provides strong guarantee for stable benefits. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 It is a schematic diagram of stacking and rolling double,

[0043] Figure 2 It is a schematic diagram of cutting stacked aluminum foil,

[0044] Among them, the names of each part are: 1, drip oil nozzle beam, 2, stacking roll 1, 3, stacking roll 2, 4, coiling roll, 5, finishing roll, 6, supporting roll, 7, cutting machine, 8, upper coiling, 9, lower coiling. DETAILED DESCRIPTION

[0045] The application will be described in detail below in combination with examples, so that those skilled in the art can better understand the application, but the application is not limited to the following examples.

[0046] Example 1

[0047] A 4.5μm ultra-thin aluminum foil double stacking process, comprising the following steps:

[0048] Step 1 roughing and intermediate rolling:

[0049] The alloy 1235H14, specification 0.24×1080mm raw material is used as the roll 1 of 4.5μm capacitor foil;

[0050] The double roll uses alloy 1235H14, specification 0.24×1080mm raw material as the roll 2 of 6.0μm cigarette paper foil;

[0051] The above two 1080 mm specifications are considered as wide materials on rolling mills that can produce a wide range of 600-1200 mm,

[0052] According to the principle of consistent pass reduction rate of finished products, the pass distribution is as follows:

[0053] Roll 1: 0.24 mm→0.09 mm→0.032 mm→0.012 mm→0.0045 mm;

[0054] To ensure the quality of each pass of roll 1, the roll and plate shape target curve of each pass of roll 1 are arranged as follows:

[0055] The first pass roll roughness Ra: 0.32-35 μm, crown Cr: 56 ‰, target plate shape curve value -40I;

[0056] The second pass roll roughness Ra: 0.32-35 μm, crown Cr: 56 ‰, target plate shape curve value -36I;

[0057] The third pass roll roughness Ra: 0.09-0.1 μm, crown Cr: 50 ‰, target plate shape curve value -32I,

[0058] The support roll roughness Ra: 0.5-0.6 μm, crown Cr: 20 ‰;

[0059] The target finished product of roll 2 is 6.0 μm, and each rolling pass is arranged as follows: 0.24 mm→0.092 mm→0.04 mm→0.016 mm→0.006 mm;

[0060] The roll arrangement of each pass is as follows:

[0061] The first pass roll roughness Ra: 0.32-35 μm, crown Cr: 56 ‰, target plate shape curve value -40I;

[0062] The second pass roll roughness Ra: 0.32-35 μm, crown Cr: 56 ‰, target plate shape curve value -36I;

[0063] The third pass roll roughness Ra: 0.1-0.12 μm, crown Cr: 50 ‰, target plate shape curve value -32I,

[0064] The support roll roughness Ra: 0.5-0.6 μm, crown Cr: 20 ‰;

[0065] Step 2 finishing rolling:

[0066] The two single rolls of 0.012 mm and 0.016 mm obtained in step 1 are double laminated by a double-opening rolling mill, i.e. (0.012 mm + 0.014 mm) → 0.010 mm laminating, and 80# base oil + 5% additive STE6 (product of Shijiazhuang Xintai Special Oil Co., Ltd.) is mixed uniformly to serve as double laminating oil, and the double laminating surface is lubricated by beam 1;

[0067] The roughness Ra of the finishing roll used is 0.05-0.06 μm, and the convexity Cr is 40‰,

[0068] The roughness Ra of the support roll of the finishing mill is 0.5-0.6 μm, and the convexity Cr is 20‰;

[0069] The thickness of the outlet of the finishing mill is controlled at 10.5 μm, and after discharging, the pinhole box is checked and measured, the upper sheet is 4.45-4.6 μm, and the pinholes are 5000-7000 / m 2 ; the lower sheet is 5.9-6.15 μm, and the pinholes are ≤200 / m 2 ; the front and back surfaces are of good quality, and meet the quality requirements of the capacitor foil and the cigarette paper foil;

[0070] Step 3: slitting:

[0071] The laminated roll obtained in step 2 is separated by a slitting machine, and since the thicknesses of the upper and lower sheets are different and the target widths of the products are different, the upper and lower sheets of the same width can only be obtained by cutting the edges of the laminated roll during slitting to obtain whole rolls 8 and 9 of the same width;

[0072] Step 4: if necessary, the rolls 8 and 9 after slitting are changed into the width and meterage required by the user by the unwinding machine, and after annealing and packaging, the production of the ultra-thin aluminum foil is completed.

[0073] Example 2

[0074] A double laminating process of a 4.5 μm ultra-thin aluminum foil, comprising the following steps:

[0075] Step 1: rough and intermediate rolling:

[0076] The alloy 1235H14, 0.24 × 1080 raw material is used as the capacitor foil 4.5 μm roll 1;

[0077] The alloy 1235H14, 0.24 × 1080 raw material is used as the aluminum foil 5.5 μm roll 2;

[0078] The above two rolls of 1080 mm specification are regarded as wide material on a rolling mill with a production width limit of 600-1200 mm,

[0079] According to the principle of consistent pass reduction rate of the finished product,

[0080] Roll 1 pass distribution: 0.24mm→0.09mm→0.032mm→0.012mm→0.0045mm;

[0081] Roll 1 pass distribution: 0.24mm→0.09mm→0.032mm→0.012mm→0.0045mm;

[0082] First pass roll roughness Ra: 0.32-35μm, crown Cr: 56‰, target plate shape curve value -40I,

[0083] Second pass roll roughness Ra: 0.32-35μm, crown Cr: 56‰, target plate shape curve value -36I,

[0084] Third pass roll roughness Ra: 0.09-0.1μm, crown Cr: 50‰, target plate shape curve value -32I,

[0085] Support roll roughness Ra: 0.5-0.6μm, crown Cr: 20‰;

[0086] Roll 1 pass distribution: 0.24mm→0.09mm→0.032mm→0.012mm→0.0045mm;

[0087] Roll 1 pass distribution: 0.24mm→0.09mm→0.032mm→0.012mm→0.0045mm;

[0088] First pass roll roughness Ra: 0.32-35μm, crown Cr: 56‰, target plate shape curve value -40I,

[0089] Second pass roll roughness Ra: 0.32-35μm, crown Cr: 56‰, target plate shape curve value -36I,

[0090] Third pass roll roughness Ra: 0.1-0.12μm, crown Cr: 50‰, target plate shape curve value -32I,

[0091] Support roll roughness Ra: 0.5-0.6μm, crown Cr: 20‰;

[0092] Step 2 finishing rolling:

[0093] The two single rolls 0.012mm and 0.014mm obtained in step 1 are double laminated by a double opening rolling mill, i.e. (0.012mm+0.014mm) laminated→0.010mm;

[0094] 80# base oil + 5% additive STE6 (product of Shijiazhuang Xintai Special Oil Co., Ltd.) is mixed uniformly and used as double laminating oil, and the double laminating surface is dripped and lubricated by beam 1;

[0095] The surface roughness Ra of the finishing rolls used is 0.05~0.06μm, and the crown Cr is 40‰.

[0096] The surface roughness Ra of the support roll of the finishing mill is 0.5~0.6μm, and the crown Cr is 20‰.

[0097] The finishing mill exit thickness is controlled at 10.0μm. After unloading, the pinhole box is checked and measured. The tension is 4.45~4.65μm, and the number of pinholes is 5000~7000 / m. 2 The thickness of the sheet is 5.45–5.65 μm, and the number of pinholes is ≤1000 / m. 2 Both sides are of good quality, and both sheets meet the quality requirements for capacitors.

[0098] Step 3: Slicing

[0099] The stacked coil obtained in step 2 is slit by a slitting machine. If the width of the two finished capacitors with the required thickness is the same, the required specifications can be obtained in one go by the slitting machine. If the finished specifications are different, the edges of the stacked coil can be cut off first to obtain coils 8 and 9 of the same width.

[0100] If necessary, proceed to step 4, where roll 8 and roll 9 are rewound and cut into the specifications required by the user via a rewinding machine. After annealing and packaging, the production process of ultra-thin aluminum foil is completed.

[0101] Example 3

[0102] A double-layer lamination process for 4.5μm ultrathin aluminum foil includes the following steps:

[0103] Step 1: Roughing and Intermediate Rolling

[0104] Alloy 1235H14, 0.24×920mm blank material was used as the 4.5μm coil of capacitor foil;

[0105] The double-wound uses alloy 8079H14 and 0.24×920 blank as roll 2 with 6.5μm soft foil;

[0106] The two 920mm rolls mentioned above are considered narrow stock on rolling mills capable of producing widths of 600–1200mm.

[0107] Based on the principle of consistent reduction rate across all finished product passes, the pass allocation is as follows:

[0108] Roll 1: 0.24mm → 0.09mm → 0.032mm → 0.012mm → 0.0045mm;

[0109] The target curves for each pass of the rolling mill in Roll 1 are arranged as follows:

[0110] First pass roughness of the roll Ra: 0.32-35 μm, crown Cr: 44 ‰, target plate shape curve value -40I,

[0111] Second pass roughness of the roll Ra: 0.32-35 μm, crown Cr: 44 ‰, target plate shape curve value -36I,

[0112] Third pass roughness of the roll Ra: 0.09-0.1 μm, crown Cr: 40 ‰, target plate shape curve value -32I,

[0113] Roughness of the support roll of the rolling mill Ra: 0.5-0.6 μm, crown Cr: 20 ‰;

[0114] The target finished product of roll 2 is 6.5 μm,

[0115] The arrangement of each rolling pass is: 0.24 mm→0.095 mm→0.044 mm→0.0175 mm→0.0065 mm;

[0116] The arrangement of each pass roll is as follows:

[0117] First pass roughness of the roll Ra: 0.32-35 μm, crown Cr: 44 ‰, target plate shape curve value -40I,

[0118] Second pass roughness of the roll Ra: 0.32-35 μm, crown Cr: 44 ‰, target plate shape curve value -36I,

[0119] Third pass roughness of the roll Ra: 0.1-0.12 μm, crown Cr: 40 ‰, target plate shape curve value -32I,

[0120] Roughness of the support roll of the rolling mill Ra: 0.5-0.6 μm, crown Cr: 20 ‰;

[0121] Step 2 finishing rolling:

[0122] The two single rolls of 0.012 mm and 0.0175 mm obtained in step 1 are double laminated by a double-opening rolling mill, i.e. laminating (0.012 mm+0.0175 mm)→exit target thickness 0.011 mm;

[0123] The double laminated oil is mixed evenly by using 80# base oil + 5% additive STE6 (product of Shijiazhuang Xintai Special Oil Co., Ltd.) as the double laminated oil, and the double laminated surface is lubricated by dripping through beam 1;

[0124] The roughness of the finishing roll used is Ra: 0.05-0.06 μm, crown Cr: 40 ‰,

[0125] The roughness Ra of the support roller of the finishing mill: 0.5-0.6 μm, the convexity Cr: 20‰,

[0126] The target thickness of the finishing mill outlet is controlled at 11 μm, and the actual measurement after blanking is 4.45-4.6 μm, and the pinhole is 8000 / m 2 The lower sheet is 6.4-6.65 μm, and the pinhole is ≤300 / m 2 The front and back quality is good, and the quality requirements of the capacitor foil and the cigarette paper foil are met at the same time;

[0127] Step 3: slitting:

[0128] The roll 4 obtained in step 2 is separated by a slitting machine, and since the upper and lower sheet thicknesses are different, if the target width of the finished product is the same, the finished product can be directly cut to obtain the required specifications; if the finished product specifications are different, only the same width of the upper and lower sheet aluminum foil can be obtained by slitting to obtain the roll 8 and the roll 9; then the roll 8 and the roll 9 are put into step 4, and the respective required specifications are obtained by reversing and slitting;

[0129] Step 4: if necessary, the roll 8 and the roll 9 after slitting are reversed by the reversing machine to cut into the width and meter number required by the user, and after direct annealing and packaging, the production process of the ultra-thin aluminum foil is completed.

[0130] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation in the present application, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A double-layer lamination process for 4.5μm ultrathin aluminum foil, characterized in that, Includes the following steps: Step 1: Roughing and Intermediate Rolling Roll 1: The cast-rolled raw material with a thickness of 0.24mm±3%, referred to as Roll 1, is rolled into a single foil with a thickness of 0.012mm through two rough rolling passes and one intermediate rolling pass. The pass distribution is 0.24mm→0.09mm→0.032mm→0.012mm. The parameters of the work rolls used in roll 1 are as follows: The first roughing pass uses a surface roughness Ra of 0.32–0.35 μm, a crown Cr of 40–56‰, and a target plate shape curve value of -40I. The second roughing roll is the same as the first pass, with a target plate shape curve value of -36I; The third intermediate rolling pass uses a surface roughness Ra of 0.09–0.10 μm, a crown Cr of 36–50‰, and a target plate shape curve value of -32I. Roll 2: A cast-rolled blank with a thickness of 0.24mm ± 3% and the same width as Roll 1, referred to as Roll 2, is used as a double-layer roll with Roll 1. It is then subjected to two passes of rough rolling and one pass of intermediate rolling to produce a single sheet of foil of the required thickness. The parameters of the work rolls used in roll 2 are as follows: The first roughing pass uses a surface roughness Ra of 0.32–0.35 μm, a crown Cr of 40–56‰, and a target plate shape curve value of -40I. The second roughing pass is the same as the first pass, with a target plate shape curve value of -36I; The third intermediate rolling pass uses a surface roughness Ra of 0.1–0.12 μm, a crown Cr of 36–50‰, and a target plate shape curve value of -32I. The roughness Ra of the support rolls used in roughing and intermediate rolling mills is 0.5~0.6μm, and the crown Cr is 20‰. Step 2: The two stacked foils of the same width but different thickness are stacked and rolled by a finishing mill equipped with double unwinding. The aluminum foil of stacked roll 1 (2) is placed on the upper surface of the single foil of stacked roll 2 (3). After the two are stacked, they are fed into the finishing roll (5) of the finishing mill and rolled at the mill exit to form a stacked roll located in the winding roll (4). The stacked roll 1 is stacked and rolled to obtain a 4.5μm ultrathin aluminum foil. The surface roughness Ra of the finishing rolls used is 0.05~0.06μm, the crown Cr is 36~50‰, and the target plate shape curve value is -26I. The inlet unit tension of double-sheet rolling is ≤50N / mm. 2 ; Step 3: Place the two stacked rolls of different thicknesses located on the winding roll (4) into the slitting machine (7) to cut them into upper winding (8) and lower winding (9) with different thicknesses. If the two sheets rolled together have the same final required width, the finished product is obtained by slitting. If the final required width of the two sheets rolled together is inconsistent, then: Step 4: The obtained upper roll (8) and lower roll (9) are reverse rolled and cut in a rewinding machine, annealed and packaged to obtain the finished product.

2. The 4.5μm ultrathin aluminum foil double-layer lamination process according to claim 1, characterized in that: In step 1, the aluminum alloy of the roll 1 is 1235H14, and the aluminum alloy used for the blank rolled with the 4.5μm ultra-thin aluminum foil is either 1235H14 or 8079H14.

3. The 4.5μm ultrathin aluminum foil double-layer lamination process according to claim 1, characterized in that: In step 1, the aluminum alloy used for the blanks double-layered and rolled with the 4.5μm ultrathin aluminum foil is 1235H14.

4. The 4.5μm ultrathin aluminum foil double-layer lamination process according to claim 1, characterized in that: In step 1, the pass assignment of roll 2 is determined based on the finished product thickness. The pass distribution for producing a finished thickness of 5.5μm is 0.24mm→0.092mm→0.036mm→0.014mm, and after stacking, a thickness of 5.5μm is obtained. The pass distribution for producing a finished thickness of 6.0 μm is 0.24 mm → 0.092 mm → 0.04 mm → 0.016 mm, and after lamination, a thickness of 6.0 μm is obtained. The pass distribution for producing a finished thickness of 6.5μm is 0.24mm→0.095mm→0.044mm→0.0175mm, and the 6.5μm thickness is obtained after roll forming.

5. The 4.5μm ultrathin aluminum foil double-layer lamination process according to claim 1, characterized in that: In step 1, the inlet tension of the roughing and intermediate rolling passes must be ≤50 N / mm. 2 .

6. The 4.5μm ultrathin aluminum foil double-layer lamination process according to claim 1, characterized in that: In step 2, the thickness of the other roll of finished product, which is rolled together with the 4.5μm ultrathin aluminum foil, does not exceed 6.5μm.

7. The 4.5μm ultrathin aluminum foil double-layer lamination process according to claim 1, characterized in that: In step 2, the surface roughness Ra of the support roll of the finishing mill is 0.5-0.6 μm, and the crown Cr is 20‰.

8. The 4.5μm ultrathin aluminum foil double-layer lamination process according to claim 1, characterized in that: In step 3, double-layer oil is dripped between the two stacked aluminum foils through the drip nozzle beam (1). The double-layer oil is made by uniformly mixing 80# base oil with 5-10% by mass of additive STE6.

9. The 4.5μm ultrathin aluminum foil double-layer lamination process according to claim 1, characterized in that: In step 3, the slitting process requires cutting off both sides and winding them into an upper roll (8) and a lower roll (9) of the same width.

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