Coiling method of aluminum alloy strip

Abstract

The invention provides a coiling method of an aluminum alloy strip. The coiling method comprises the following steps that the precision of a coiling shaft of a stretch-bending straightening machine is adjusted to a preset value; the aluminum alloy strip to be straightened is cooled; one part of the cooled aluminum alloy strip to be straightened is straightened through a stretch bending straightener; cutting the initial sample into a plurality of fine samples with the same size along the rolling direction and the direction vertical to the rolling direction in the width direction of the initial sample; detecting transverse bending and longitudinal bending of the plurality of fine samples; calculating the initial coiling tension of the coiling shaft according to the yield strength parameter; and the aluminum alloy strip to be straightened is straightened and coiled. Compared with the prior art, the problem that the improvement effect of the aluminum alloy strip on the sticking damage defect in the speed increasing stage is limited can be solved, potential quality hazards such as new pressure pits, bumps, oil stains, color differences, wrinkles and scratches can be overcome, and the coiling sticking damage defect of the aluminum alloy strip produced through the stretch bending and straightening machine is greatly reduced and even eliminated.

Description

Technical Field

[0001] The invention is applicable to the technical field of aluminum processing, and in particular relates to a method for coiling an aluminum alloy strip. Background Art

[0002] The "sticking" defect that occurs when aluminum and aluminum alloy strips are coiled is a surface defect that is very easy to occur when the tension bending and straightening machine produces aluminum and aluminum alloy strips. This kind of coiling "sticking" generally occurs in the "coiling base speed-up" stage at the beginning of production and the "speed reduction" stage at the end of production. In addition, it is also distributed in the stable production stage of aluminum alloy strips when it is serious; its essence is that the "close contact and dislocation between layers" in the local micro-area of ​​the aluminum alloy strip produces "dry friction" or even "pressure welding" to cause surface damage, and there are many factors that affect the coiling "sticking" defect, such as the strength of the aluminum alloy strip, the plate shape of the aluminum alloy strip, the temperature of the aluminum alloy strip, the actual coiling tension of the aluminum alloy strip, the accuracy of the coiling shaft, etc., making the prevention and control of this "defect" always a major problem in this field.

[0003] In the prior art, the methods for treating the "sticking" during coiling include: (1) installing a set of pressing rollers (also called ironing rollers, ironing pressure rollers) above the winding shaft of the tension and bending straightening machine, and pressing the pressing rollers in the tangential direction of the aluminum alloy strip coiling during production to prevent the interlayer displacement of the aluminum alloy strip. However, the disadvantage of this method is that it has limited effect on improving the "sticking" defect in the speed-up stage, and it is easy to cause aluminum powder on the surface of the aluminum alloy strip to fall off and adhere to the surface of the pressing roller to form aluminum powder aggregation, causing defects such as dents and scratches on the surface of the aluminum alloy strip. (2) Before coiling, the surface of the aluminum alloy strip is coated or padded with paper to avoid direct contact between the layers of the aluminum alloy strip, thereby eliminating the "sticking defect". The disadvantage of this method is that it increases the production cost of the bending and straightening machine, and also leads to the addition of additional paper or film removal processes during unwinding. At the same time, if the paper is damp and absorbs water, it will cause oxidation corrosion defects on the surface of the aluminum alloy strip. If the film contains impurities, it will cause pitting and scratch defects on the surface of the aluminum alloy strip. If the paper or film is wrinkled, it will also cause color difference, wrinkling, bulging and other defects on the surface of the aluminum alloy strip. (3) Spray oil on the surface of the aluminum alloy strip before coiling to increase oil film protection and reduce dry friction between the layers of the aluminum alloy strip, thereby improving the "sticking defect". The disadvantages of this method are that it is easy to cause fire, the pungent smell produced by the volatilization of oil causes physical discomfort to the operator, and it is easy to cause surface oil stains and color difference defects on the aluminum alloy strip, and an additional degreasing process is required.

[0004] Therefore, there is an urgent need for a new coiling method for aluminum alloy strips to solve the above-mentioned technical problems. Summary of the invention

[0005] The present invention provides a coiling method for an aluminum alloy strip, aiming to improve the adhesion defect of aluminum and aluminum alloy strips and solve the problems of dents, scratches, color difference, wrinkles, bulging, etc. of aluminum and aluminum alloy strips.

[0006] The present invention provides a method for coiling an aluminum alloy strip, the method comprising the following steps:

[0007] S1. Adjust the accuracy of the winding shaft of the tension bending straightening machine to a preset value;

[0008] S2, before straightening the aluminum alloy strip to be straightened, cooling the aluminum alloy strip to be straightened;

[0009] S3, subjecting a portion of the aluminum alloy strip to be straightened after the cooling treatment to straightening treatment through the stretch bending straightening machine to obtain a first aluminum alloy strip, and sampling the first aluminum alloy strip to obtain a primary sample;

[0010] S4, detecting whether the preliminary sample meets the plate wave target value, and if so, cutting the preliminary sample into a plurality of fine samples of the same size along the rolling direction and the vertical rolling direction in the width direction of the preliminary sample;

[0011] S5, respectively testing the transverse bending and longitudinal bending of the plurality of fine samples, and determining whether the transverse bending and longitudinal bending of each fine sample meets the plate bending target value, and if so, proceeding to step S6;

[0012] S6. Performing mechanical property testing on the aluminum alloy strip to be straightened to obtain corresponding yield strength parameters, and calculating the initial coiling tension of the coiling shaft according to the yield strength parameters;

[0013] S7, setting the actual winding tension of the winding shaft according to the initial winding tension according to a preset rule;

[0014] S8. Straightening and coiling the aluminum alloy strip to be straightened to obtain a finished aluminum alloy strip.

[0015] Preferably, in step S1, the preset values ​​are: the horizontality of the winding shaft is less than or equal to 0.05 mm / m, the radial runout of the winding shaft is less than or equal to 0.25 mm, the axial runout of the winding shaft is less than or equal to 0.25 mm, and the parallelism of the winding shaft relative to the outlet guide roller of the stretch straightening machine is less than or equal to 0.1 mm.

[0016] Preferably, in step S2, the metal temperature of the aluminum alloy strip to be straightened after the cooling treatment reaches the workshop environment temperature ±3°C and the metal temperature of the aluminum alloy strip to be straightened is less than or equal to 45°C.

[0017] Preferably, in step S2, a cooling device is provided between the drying box and the tension roller of the stretch-bend straightening machine, and the aluminum alloy strip to be straightened is cooled by the cooling device before the aluminum alloy strip to be straightened is straightened.

[0018] Preferably, in step S4, the plate wave target value is: the wave height of the initial sample is less than or equal to 2 mm and the wavelength of the initial sample is greater than or equal to 333 mm.

[0019] Preferably, in step S5, the plate bending target value is: the transverse bending of the fine sample is less than or equal to 1.5 mm, and the longitudinal bending of the fine sample is less than or equal to 3 mm.

[0020] Preferably, in step S6, the initial winding tension satisfies the following rules:

[0021] F 初始 =H*B*σ 0.2 *K;

[0022] Among them, F 初始 represents the initial coiling tension initially set for the coiling shaft, H represents the thickness of the aluminum alloy strip to be straightened; B represents the width of the aluminum alloy strip to be straightened; σ 0.2 represents the yield strength parameter of the aluminum alloy strip to be straightened; K represents the adjustment coefficient.

[0023] Preferably, in step S7, the preset rule is a gradient actual winding tension that satisfies the following conditions:

[0024] F 实际 =F 初始 *(1-α*(D 实时 -D min ) / (D max -D min ));

[0025] Among them, F 实际 represents the actual winding tension of the winding shaft, α represents the tension gradient coefficient, and D 实时 It represents the actual outer diameter of the aluminum alloy strip to be straightened when it is coiled after straightening, D min represents the outer diameter of the sleeve of the aluminum alloy strip to be straightened when it is not coiled, D max Indicates the maximum outer diameter of the strip coil allowed by the coiling shaft.

[0026] Preferably, in step S8, the coiling process of the aluminum alloy strip to be straightened includes a speed-up stage from 0 to stable operation, a stable operation stage at a constant speed, and a speed-down stage from stable operation to a speed of 0, wherein the production speed in the stable operation stage is less than or equal to 120 m / min, and the production speed deviation of the finished aluminum alloy strip in the stable operation stage is ±2 m / min.

[0027] Preferably, in step S8, the speed-up phase takes less than or equal to 10 seconds, and the speed-down phase takes less than or equal to 10 seconds.

[0028] Compared with the prior art, the present invention adjusts the accuracy of the winding shaft of the stretch bending and straightening machine, reduces the temperature of the aluminum alloy strip, improves the plate shape standard of the aluminum alloy strip, standardizes the winding tension when the aluminum alloy strip is coiled, adopts a variable tension control mode with a certain gradient for the actual winding tension, and limits the maximum production speed and deviation value of the aluminum alloy strip as well as the time consumption of the lifting and lowering stages. In order to prevent the sticking defect of aluminum alloy strip during coiling, the present invention overcomes the limited improvement effect on the sticking defect in the speed-up stage and the new quality hazards such as dents and scratches caused by the method of installing a pressure roller above the coiling shaft of the stretch bending and straightening machine to press the strip production method; overcomes the increased cost and the new quality hazards such as oxidation corrosion, dents, scratches, wrinkles, color difference and bulging caused by the method of coating or padding the strip surface before coiling; overcomes the disadvantages of easily causing fire, causing physical discomfort to the operator, adding oil stains, color difference, increased production cost of subsequent processes and quality hazards of poor coating caused by the method of spraying oil on the strip surface before coiling, so that the sticking defect of the coiling of the aluminum alloy strip produced by the stretch bending and straightening machine is greatly reduced or even eliminated. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be described in detail below in conjunction with the accompanying drawings. The above and other aspects of the present invention will become clearer and easier to understand through the detailed description made in conjunction with the following drawings. In the accompanying drawings:

[0030] Figure 1 It is a flowchart of a method for coiling an aluminum alloy strip provided by an embodiment of the present invention;

[0031] Figure 2 It is a schematic diagram of the structure of the fine sample provided by an embodiment of the present invention when undergoing coiling processing. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] Please refer to Figure 1-Figure 2The present invention provides a method for coiling an aluminum alloy strip, the coiling method comprising the following steps:

[0034] S1. Adjust the accuracy of the winding shaft of the tension bending straightening machine to the preset value.

[0035] In the embodiment of the present invention, the preset values ​​are: the accuracy of the winding shaft of the tension bending straightening machine, that is, the horizontality of the winding shaft, the radial runout of the winding shaft, the axial runout of the winding shaft, and the parallelism of the winding shaft relative to the outlet guide roller. The larger the above values, the worse the accuracy of the winding shaft. In the production process, the probability of causing the interlayer misalignment of the aluminum alloy strip and the resulting adhesion defects is greater, the distribution is wider, and the degree is more serious. Therefore, the horizontality of the winding shaft is less than or equal to 0.05mm / m, the radial runout of the winding shaft is less than or equal to 0.25mm, the axial runout of the winding shaft is less than or equal to 0.25mm, and the parallelism of the winding shaft relative to the outlet guide roller of the tension bending straightening machine is less than or equal to 0.1mm. Only when the various accuracies of the winding shaft meet the above preset value ranges, can the subsequent steps of production be carried out, thereby effectively reducing the adhesion defect problem caused by the interlayer misalignment of the aluminum alloy strip.

[0036] S2. Before straightening the aluminum alloy strip, cooling the aluminum alloy strip.

[0037] In the embodiment of the present invention, the aluminum alloy strip to be straightened is cooled so that the metal temperature of the aluminum alloy strip to be straightened reaches the requirement of ±3°C of the workshop ambient temperature, and the maximum metal temperature of the aluminum alloy strip to be straightened is ≤45°C. Specifically, the workshop ambient temperature refers to the indoor temperature of the workshop or factory around the aluminum alloy strip to be straightened during production, which changes with the ambient temperature.

[0038] Specifically, the existing tension bending and straightening machines are generally equipped with a water cleaning function. The aluminum alloy strip needs to be dried after water cleaning. The temperature of the aluminum alloy strip after drying is generally 90-120°C. The aluminum alloy strip enters the straightening process without cooling or only after simple cooling. Since the thermal expansion coefficient of aluminum alloy is 20-24μm / m*℃, the higher the temperature of the aluminum alloy strip, the more intense the hot rolling expansion of the aluminum alloy strip. In the subsequent cooling process to room temperature, the more intense the contraction of the aluminum alloy strip, resulting in greater probability, wider distribution and more serious degree of interlayer dislocation of the aluminum alloy strip and thus adhesion defects. Therefore, the present invention limits the upper temperature limit of the aluminum alloy strip to be straightened, and at the same time, considering the production cost of cooling and the adaptability to the ambient temperature, the temperature of the aluminum alloy strip to be straightened should be limited within a certain range.

[0039] In an embodiment of the present invention, a cooling device is provided between the drying box and the tension roller of the stretch-bend straightening machine, so that the aluminum alloy strip to be straightened can be cooled quickly and at low cost.

[0040] S3, passing a portion of the aluminum alloy strip to be straightened after the cooling treatment through the stretch bending straightening machine for straightening treatment to obtain a first aluminum alloy strip, and sampling the first aluminum alloy strip to obtain an initial sample.

[0041] In an embodiment of the present invention, the aluminum alloy strip to be straightened is stretched and straightened by the tension roller of the stretch-bend straightening machine and pressed down and straightened by the straightening roller of the stretch-bend straightening machine. After the straightening process obtains a first aluminum alloy strip, the first aluminum alloy strip is sampled to obtain an initial sample.

[0042] S4, checking whether the preliminary sample meets the plate wave target value, if so, cutting the preliminary sample into a plurality of fine samples of the same size along the rolling direction and the vertical rolling direction in the width direction of the preliminary sample.

[0043] In an embodiment of the present invention, the primary sample is placed on a standard marble platform for testing, and the primary sample that meets the plate wave target value (that is, the wave height of the primary sample is less than or equal to 2 mm and the wavelength of the primary sample is greater than or equal to 333 mm) is cut into multiple fine samples of uniform size along the rolling direction in the width direction of the primary sample.

[0044] S5. Detect the transverse curvature and longitudinal curvature of the plurality of fine samples respectively to determine whether the transverse curvature and longitudinal curvature of each fine sample meets the plate bending target value. If so, proceed to step S6.

[0045] In an embodiment of the present invention, the fine sample is placed again on a standard marble platform for testing. Each of the fine samples needs to satisfy the requirement that the lateral curvature of the fine sample is less than or equal to 1.5 mm, and the longitudinal curvature of the fine sample is less than or equal to 3 mm. Only when the fine sample meets the above two indicators at the same time can the subsequent production steps be carried out.

[0046] Specifically, the larger the wave height value of the aluminum alloy strip, the smaller the wavelength value; the larger the longitudinal bending and transverse bending values ​​of the aluminum alloy strip, the worse the overall plate shape and local plate shape of the aluminum alloy strip. During the coiling process, the probability of interlayer dislocation of the aluminum alloy strip and the resulting adhesion defects is greater, the distribution is wider, and the degree is more serious. Therefore, limiting the wavelength and wave height of the initial sample and the longitudinal bending and transverse bending of the fine sample can effectively reduce the adhesion defect problem caused by interlayer dislocation of the aluminum alloy strip. At the same time, in order to improve the plate shape of the aluminum alloy strip after correction, the commonly used "3-roller" and "5-roller" roller straightening machines can be upgraded to "7-roller", "9-roller", "11-roller", "13-roller" and other straightening methods, and equipped with one or several groups of anti-transverse bending straightening roller systems.

[0047] S6. Perform mechanical property testing on the aluminum alloy strip to be straightened to obtain corresponding yield strength parameters, and calculate the initial coiling tension of the coiling shaft according to the yield strength parameters.

[0048] In an embodiment of the present invention, the initial winding tension satisfies the following rules:

[0049] F 初始 =H*B*σ 0.2 *K;

[0050] Among them, F 初始 represents the initial coiling tension of the coiling shaft (unit N), H represents the thickness of the aluminum alloy strip to be straightened (unit mm), B represents the width of the aluminum alloy strip to be straightened (unit mm), σ 0.2 Indicates the yield strength parameter of the aluminum alloy strip to be straightened (unit: N / mm 2 That is, MPa), K represents the adjustment coefficient, which is generally 3.5-5%.

[0051] Specifically, the initial coiling tension of the coiling shaft is related to the thickness, width, yield strength and adjustment coefficient of the fine sample, and will also directly affect the actual coiling tension of the aluminum alloy strip. If the actual coiling tension deviates from the reasonable range too small or too large, it will cause the aluminum alloy strip to move between layers, and then the probability of adhesion defects will be greater, the distribution will be wider, and the degree will be more serious. The general practice in the industry is that the operator sets it based on past experience, which is somewhat arbitrary. The embodiment of the present invention ensures the accuracy of the set value by refining a specific mathematical calculation formula.

[0052] S7. Setting the actual winding tension of the winding shaft according to the initial winding tension according to a preset rule.

[0053] In the embodiment of the present invention, the actual winding tension of the winding shaft adopts the "variable tension with a certain gradient" control mode, and the preset rule is the actual winding tension of the gradient that meets the following conditions:

[0054] F 实际 =F 初始 *(1-α*(D 实时 -D min ) / (D max -D min ));

[0055] Among them, F 实际 represents the actual winding tension (unit: N), α represents the tension gradient coefficient (unit: %), D 实时 It indicates the actual outer diameter of the aluminum alloy strip to be straightened when it is coiled after straightening (in mm), D min represents the outer diameter of the sleeve of the aluminum alloy strip to be straightened when it is not coiled (i.e., the outer diameter of the paper sleeve, aluminum sleeve or steel sleeve when the aluminum alloy strip to be straightened is not coiled, in mm), D max Indicates the maximum outer diameter of the strip coil allowed by the coiling shaft (unit: mm).

[0056] Specifically, during the coiling process, the coil diameter of the aluminum alloy strip to be straightened becomes larger and larger, and the wrap angle between the aluminum alloy strip to be straightened and the exit guide roller and the tangent point of the strip coiling are constantly changing (e.g. Figure 2 As shown in the figure, if the coiling tension of the aluminum alloy strip to be straightened keeps a constant tension value, the probability of interlayer dislocation of the aluminum alloy strip to be straightened and thus causing adhesion defects is greater, the distribution is wider, and the degree is more serious. Therefore, it is necessary to reduce the coiling tension of the aluminum alloy strip to be straightened according to a certain rule as the coil diameter increases to reduce the influence of interlayer dislocation. Therefore, the present invention introduces the concept of gradient and gives a mathematical formula for the actual coiling tension and the initial coiling tension, thereby ensuring the accuracy of the actual coiling tension.

[0057] S8. Straightening and coiling the aluminum alloy strip to be straightened to obtain a finished aluminum alloy strip.

[0058] In the embodiment of the present invention, the coiling process of the aluminum alloy strip to be straightened includes a speed-up stage from 0 to stable operation, a stable operation stage at a constant speed, and a speed-down stage from stable operation to a speed of 0, wherein the production speed in the stable operation stage is less than or equal to 120 m / min, and the production speed deviation of the finished aluminum alloy strip in the stable operation stage is ±2 m / min. The speed-up stage takes less than or equal to 10 seconds, and the speed-down stage takes less than or equal to 10 seconds.

[0059] Specifically, the greater the absolute value of the production speed of the aluminum alloy strip and the greater the fluctuation value, the more severe the interlayer displacement of the aluminum alloy strip itself and the radial runout of the coiling shaft will be. In the final analysis, the probability of the interlayer displacement of the aluminum alloy strip and the resulting adhesion defect will be greater, the wider the distribution, and the more serious the degree. Therefore, the present invention effectively reduces the adhesion defect problem caused by the interlayer displacement of the aluminum alloy strip by limiting the maximum production speed and production speed deviation value of the aluminum alloy strip. At the same time, the longer the aluminum alloy strip is in the unstable stage of the speed-up stage and the speed-down stage, the longer the number of bad meters of the aluminum alloy strip adhesion will be. Therefore, the time consumption of the speed-up stage and the speed-down stage of the aluminum alloy strip is limited.

[0060] In order to better understand the effect of the coiling method of the aluminum alloy strip proposed in the present invention, the coiling method proposed in the present invention and the coiling method not proposed in the present invention were tested on a 1850mm stretch bending straightening machine, and the comparison results are shown in Table 1 below.

[0061] Table 1 [Comparison of coiling effects]

[0062]

[0063]

[0064] It can be seen that the finished aluminum alloy strip obtained by the above steps of the present invention has, after testing, the defective meters of coiling adhesion only concentrated in the inner ring bottoming ≤30 meters and the outer ring ≤10 meters area scattered distribution, which greatly reduces the adhesion defects of aluminum and aluminum alloy strips.

[0065] Compared with the prior art, the present invention adjusts the accuracy of the winding shaft of the stretch bending and straightening machine, reduces the temperature of the aluminum alloy strip, improves the plate shape standard of the aluminum alloy strip, standardizes the winding tension when the aluminum alloy strip is coiled, adopts a variable tension control mode with a certain gradient for the actual winding tension, and limits the maximum production speed and deviation value of the aluminum alloy strip as well as the time consumption of the lifting and lowering stages. In order to prevent the sticking defect of aluminum alloy strip during coiling, the present invention overcomes the limited improvement effect on the sticking defect in the speed-up stage and the new quality hazards such as dents and scratches caused by the method of installing a pressure roller above the coiling shaft of the stretch bending and straightening machine to press the strip production method; overcomes the increased cost and the new quality hazards such as oxidation corrosion, dents, scratches, wrinkles, color difference and bulging caused by the method of coating or padding the strip surface before coiling; overcomes the disadvantages of easily causing fire, causing physical discomfort to the operator, adding oil stains, color difference, increased production cost of subsequent processes and quality hazards of poor coating caused by the method of spraying oil on the strip surface before coiling, so that the sticking defect of the coiling of the aluminum alloy strip produced by the stretch bending and straightening machine is greatly reduced or even eliminated.

[0066] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0067] The embodiments of the present invention are described above in conjunction with the accompanying drawings. What is disclosed is only the preferred embodiment of the present invention. However, the present invention is not limited to the above-mentioned specific implementation manner. The above-mentioned specific implementation manner is only illustrative rather than restrictive. Under the enlightenment of the present invention, ordinary technicians in this field can also make many forms and equivalent changes without departing from the scope of protection of the purpose of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A method for coiling an aluminum alloy strip, characterized in that: The coiling method comprises the following steps: S1. Adjust the accuracy of the winding shaft of the tension bending straightening machine to a preset value; S2. Before straightening the aluminum alloy strip, cooling the aluminum alloy strip to be straightened; S3, subjecting a portion of the aluminum alloy strip to be straightened after the cooling treatment to straightening treatment through the stretch bending straightening machine to obtain a first aluminum alloy strip, and sampling the first aluminum alloy strip to obtain a primary sample; S4, detecting whether the preliminary sample meets the plate wave target value, and if so, cutting the preliminary sample into a plurality of fine samples of the same size along the rolling direction and the vertical rolling direction in the width direction of the preliminary sample; S5, respectively testing the transverse bending and longitudinal bending of the plurality of fine samples, and determining whether the transverse bending and longitudinal bending of each fine sample meets the plate bending target value, and if so, proceeding to step S6; S6. Performing mechanical property testing on the aluminum alloy strip to be straightened to obtain corresponding yield strength parameters, and calculating the initial coiling tension of the coiling shaft according to the yield strength parameters; S7, setting the actual winding tension of the winding shaft according to the initial winding tension according to a preset rule; S8. Straightening and coiling the aluminum alloy strip to be straightened to obtain a finished aluminum alloy strip.

2. The method for coiling an aluminum alloy strip according to claim 1, characterized in that: In step S1, the preset values ​​are: the horizontality of the winding shaft is less than or equal to 0.05 mm / m, the radial runout of the winding shaft is less than or equal to 0.25 mm, the axial runout of the winding shaft is less than or equal to 0.25 mm, and the parallelism of the winding shaft relative to the outlet guide roller of the stretch straightening machine is less than or equal to 0.1 mm.

3. The method for coiling an aluminum alloy strip according to claim 1, characterized in that: In step S2, the metal temperature of the aluminum alloy strip to be straightened after the cooling treatment reaches the workshop environment temperature ±3°C and the metal temperature of the aluminum alloy strip to be straightened is less than or equal to 45°C.

4. The method for coiling an aluminum alloy strip according to claim 1, characterized in that: In step S2, a cooling device is provided between the drying box and the tension roller of the stretch-bend straightening machine, and the aluminum alloy strip to be straightened is cooled by the cooling device before the aluminum alloy strip to be straightened is straightened.

5. The method for coiling an aluminum alloy strip according to claim 1, characterized in that: In step S4, the plate wave target value is: the wave height of the initial sample is less than or equal to 2 mm and the wavelength of the initial sample is greater than or equal to 333 mm.

6. The method for coiling an aluminum alloy strip according to claim 1, characterized in that: In step S5, the plate bending target value is: the transverse bending of the fine sample is less than or equal to 1.5 mm, and the longitudinal bending of the fine sample is less than or equal to 3 mm.

7. The method for coiling an aluminum alloy strip according to claim 1, characterized in that: In step S6, the initial winding tension satisfies the following rules: F 初始 =H*B*σ 0.2 *K; Among them, F 初始 represents the initial coiling tension initially set for the coiling shaft, H represents the thickness of the aluminum alloy strip to be straightened; B represents the width of the aluminum alloy strip to be straightened; σ 0.2 represents the yield strength parameter of the aluminum alloy strip to be straightened; K represents the adjustment coefficient.

8. The method for coiling an aluminum alloy strip according to claim 7, characterized in that: In step S7, the preset rule is a gradient actual winding tension that satisfies the following conditions: F 实际 =F 初始 *(1-α*(D 实时 -D min ) / (D max -D min )); Among them, F 实际 represents the actual winding tension of the winding shaft, α represents the tension gradient coefficient, and D 实时 It represents the actual outer diameter of the aluminum alloy strip to be straightened when it is coiled after straightening, D min represents the outer diameter of the sleeve of the aluminum alloy strip to be straightened when it is not coiled, D max Indicates the maximum outer diameter of the strip coil allowed by the coiling shaft.

9. The method for coiling an aluminum alloy strip according to claim 1, characterized in that: In step S8, the coiling process of the aluminum alloy strip to be straightened includes a speed-up stage from 0 to stable operation, a stable operation stage at a constant speed, and a speed-down stage from stable operation to a speed of 0, wherein the production speed in the stable operation stage is less than or equal to 120 m / min, and the production speed deviation of the finished aluminum alloy strip in the stable operation stage is ±2 m / min.

10. The method for coiling an aluminum alloy strip according to claim 9, characterized in that: In step S8, the speed-up phase takes less than or equal to 10 seconds, and the speed-down phase takes less than or equal to 10 seconds.

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