CN115870337A - Preparation method of aluminum alloy strip and aluminum alloy strip - Google Patents

Abstract

The invention discloses a preparation method of an aluminum alloy strip and the aluminum alloy strip, wherein the preparation method comprises the following steps: s1, preparing an ingot by adopting a semi-continuous casting method; s2, carrying out hot continuous rolling on the cast ingot to obtain a hot rolled blank with the thickness of 5 mm; s3, cold rolling the hot rolled blank to obtain an aluminum coil with the thickness of 0.8 mm; the cold rolling comprises a first rolling pass, a second rolling pass, a third rolling pass, a fourth rolling pass and a fifth rolling pass in sequence; and S4, finishing the aluminum coil to obtain an aluminum alloy strip with the thickness of 0.8 mm. The aluminum alloy strip prepared by the preparation method provided by the invention has uniform and controllable surface gloss, and does not need to be polished subsequently, so that the production cost is reduced, the production efficiency is improved, and the preparation process is simpler.

Description

Preparation method of aluminum alloy strip and aluminum alloy strip

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of aluminum processing, in particular to a preparation method of an aluminum alloy strip and the aluminum alloy strip.

[ background of the invention ]

Under the pressure of energy and environmental protection, new energy automobiles undoubtedly become the development direction of future automobiles, and the demand and development of new energy automobiles drive the development of various automobile batteries, automobile body lightweight and automobile part industries in the new energy era.

In light-weight materials of automobiles, the comprehensive cost performance of the aluminum alloy material is higher than that of steel, magnesium, plastic and composite materials, and the aluminum alloy material has great advantages in the aspects of application technology, operation safety and recycling. But some automobile materials have certain requirements on the glossiness of the surface of the aluminum alloy.

The traditional method for improving the glossiness of the surface of the aluminum alloy is to improve the glossiness of the surface of the aluminum alloy through polishing processes such as mechanical polishing, chemical polishing or electrochemical polishing, and the glossiness of the surface of the aluminum alloy is improved by adopting the polishing processes, so that not only is separate equipment required, but also manual auxiliary operation is required, and the problems of high production cost, low efficiency and complex process are caused.

[ summary of the invention ]

The invention aims to provide a preparation method of an aluminum alloy strip, which aims to solve the problems of high production cost, low efficiency and complex process of the conventional method for improving the surface glossiness of the aluminum alloy.

In a first aspect, the present invention provides a method of making an aluminum alloy strip, comprising the steps of:

s1, preparing an ingot by adopting a semi-continuous casting method;

s2, carrying out hot continuous rolling on the cast ingot to obtain a hot-rolled blank with the thickness of 5 mm; wherein the thickness of the aluminum-adhered layer of the roller is 11-15 μm in the rolling process of the hot continuous rolling;

s3, cold rolling the hot rolled blank to obtain an aluminum coil with the thickness of 0.8 mm; the cold rolling method comprises the following steps of performing cold rolling on a steel plate, wherein the cold rolling passes sequentially comprise a first rolling pass, a second rolling pass, a third rolling pass, a fourth rolling pass and a fifth rolling pass;

the first rolling pass comprises: rolling the hot rolled blank with the thickness of 5mm into an aluminum coil one-pass hot rolled blank with the thickness of 3.2mm, wherein the rolling speed is 100-200 m/min, the roughness of a roller is Ra =0.4 +/-0.02 mu m, rz =3.2 +/-0.2 mu m and RPc = 180-200, and the rolling pass of the roller is more than 5;

and the second rolling pass: rolling the one-pass hot rolled blank with the thickness of 3.2mm into a two-pass hot rolled blank with the thickness of 2.1mm, wherein the rolling speed is 300-400 m/min, the roughness of a roller is Ra =0.32 +/-0.02 mu m, rz =2.56 +/-0.2 mu m and RPc = 160-180, and the rolling pass of the roller is more than 5 passes;

and the third rolling pass: rolling the two hot rolled blanks with the thickness of 2.1mm into three hot rolled blanks with the thickness of 1.42mm, wherein the rolling speed is 400-500 m/min, the roughness of a roller is Ra =0.28 +/-0.01 mu m, rz =2.24 +/-0.1 mu m and RPc = 150-160, and the rolling pass of the roller is more than 5;

and the fourth rolling pass: rolling the three hot rolled blanks with the thickness of 1.42mm into four hot rolled blanks with the thickness of 0.95mm, wherein the rolling speed is 400-500 m/min, the roughness of a roller is Ra =0.28 +/-0.01 mu m, rz =2.24 +/-0.1 mu m, RPc = 140-150, and the rolling pass of the roller is more than 16;

and the fifth rolling pass: rolling the four hot rolled blanks with the thickness of 0.95mm into the aluminum coil with the thickness of 0.8mm, wherein the rolling speed is 300-400 m/min, the roughness of a roller is Ra =0.28 +/-0.01 mu m, rz =2.24 +/-0.1 mu m and RPc = 130-140, and the rolling pass of the roller is more than 16;

and S4, finishing the aluminum coil to obtain an aluminum alloy strip with the thickness of 0.8 mm.

Preferably, the rolling rolls used in the first rolling pass, the second rolling pass, the third rolling pass, the fourth rolling pass, and the fifth rolling pass are each subjected to 3 or more passes of rolling.

Preferably, the rolling rolls used in the first rolling pass, the second rolling pass, and the third rolling pass are each subjected to 5 or more passes.

Preferably, the rolling rolls used in the fourth rolling pass and the fifth rolling pass are rolled by 16 or more passes.

Preferably, in the step S2, the thickness of the aluminum-adhered layer of the rolling roll is 13 μm in the rolling process of the hot continuous rolling.

Preferably, in the step S2, before the hot continuous rolling, a brush mark test is performed on the roller, and the brush mark width of the nylon brush is ensured to be 28-30 mm; the hot continuous rolling comprises hot rough rolling carried out by adopting a single machine frame and hot finish rolling carried out by adopting three machine frames in sequence, and the temperature of a roller of the third machine frame is more than 80 ℃ when the hot finish rolling is carried out; the finishing temperature of the hot continuous rolling is 330-350 ℃.

Preferably, in step S3, the parameters of the rolling oil used in the first rolling pass, the second rolling pass, and the third rolling pass are as follows: the kinematic viscosity of the rolling oil is less than or equal to 2.8 centistokes, the acid value of the rolling oil is less than or equal to 0.20mgKOH/g, the mass percent of additives in the rolling oil is 6.0-10.0%, the light transmittance of the rolling oil is greater than or equal to 85%, the oil box test of the rolling oil is less than or equal to 2C, and the colloid of the rolling oil is less than or equal to 1000mg/100ml.

Preferably, in step S3, the parameters of the rolling oil used in the fourth rolling pass and the fifth rolling pass are as follows: the kinematic viscosity of the rolling oil is less than or equal to 2 centistokes, lauric acid is added into the rolling oil to control the acid value of the rolling oil to be less than or equal to 0.20mgKOH/g, the mass percentage of the additive in the rolling oil is 6.0-7.0%, the light transmittance of the rolling oil is greater than or equal to 92%, the oil box test of the rolling oil is less than or equal to 2b, and the colloid of the rolling oil is less than or equal to 800mg/100ml.

Preferably, in step S4, the step of finishing the aluminum coil includes:

stretch bending and straightening the aluminum coil; the speed of stretch bending straightening is less than or equal to 80mm/min, the number of waves existing in each 1000mm of the aluminum coil after stretch bending straightening is less than 3, the wave height is less than or equal to 3mm, and the wavelength is greater than or equal to 500mm.

In a second aspect, the present invention provides an aluminium alloy strip produced by the above method of producing an aluminium alloy strip.

Compared with the prior art, the preparation method of the aluminum alloy strip limits the thickness of the aluminum-adhered layer of the roller in the rolling process of hot continuous rolling, limits the roughness of the roller in each rolling pass of cold rolling, and is matched with the process parameter limitation of each step, so that the surface gloss of the prepared aluminum alloy strip is uniform and controllable, the subsequent grinding is not needed, the production cost is reduced, the production efficiency is improved, and the preparation process is simpler.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

FIG. 1 is a schematic flow chart illustrating steps of a method for manufacturing an aluminum alloy strip according to an embodiment of the present invention;

FIG. 2 is a chart comparing the rolling pass of the rolls, the arithmetic mean deviation of the profile of the rolls, and the gloss of the aluminum coil used in the cold rolling of the method for producing an aluminum alloy strip according to the example of the present invention;

FIG. 3 is a chart comparing the pass of the rolls used in the cold rolling, the maximum height of the profile of the rolls, and the gloss of the aluminum coil in the method of making an aluminum alloy strip according to an embodiment of the present invention;

FIG. 4 is a chart comparing the pass of the rolls used in the cold rolling, the peak roughness count of the rolls, and the gloss of the aluminum coil in a method of making an aluminum alloy strip according to an embodiment of the present invention.

[ detailed description ] A

The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, an embodiment of the present invention provides a method for preparing an aluminum alloy strip, which includes the following steps:

and S1, preparing an ingot by adopting a semi-continuous casting method.

Wherein, before the ingot is prepared by adopting a semi-continuous casting method, the method comprises the following steps: melting the aluminum ingot through a smelting furnace, and batching. Firstly melting the aluminum ingot through the smelting furnace, then batching, and finally preparing the ingot casting by adopting a semi-continuous casting method.

The ingredients of the aluminum alloy strip can be prepared according to actual requirements, and the ingredients can be prepared according to different components and mass percentages, which are not illustrated herein.

And S2, carrying out hot continuous rolling on the cast ingot to obtain a hot-rolled blank with the thickness of 5mm.

Wherein the thickness of the aluminum adhering layer of the roller is 11-15 μm in the rolling process of the hot continuous rolling.

The method comprises the following steps before the ingot is subjected to hot continuous rolling: milling the cast ingot, and milling the cold shut coarse crystal layer and the segregation layer; wherein the upper surface and the lower surface of the ingot are both milled by 15mm.

The hot continuous rolling is carried out in a hot continuous rolling mode of '1 + 3'; namely, the hot continuous rolling comprises hot rough rolling which is firstly carried out by adopting a single machine frame and then hot finish rolling which is sequentially carried out by adopting three machine frames.

Before rolling, the hot continuous rolling is performed, the brushing mark test is performed on the roller, and the brushing mark width of the nylon brush is ensured to be 28-30 mm; the finishing temperature of the hot continuous rolling is 330-350 ℃, namely the temperature of the hot finish rolling during the final rolling is 330-350 ℃; the temperature of the roller of the third frame is more than 80 ℃ when the hot continuous rolling is carried out, thus the hot rolling blank with fine and uniform surface grains can be obtained.

Preferably, the thickness of the aluminum adhering layer of the roller in the rolling process of the hot continuous rolling is 13 μm; of course, the thickness of the aluminum-adhered layer of the roller in the rolling process of the hot continuous rolling can also be 12 μm or 14 μm, etc., according to actual requirements.

And S3, cold rolling the hot rolled blank to obtain an aluminum coil with the thickness of 0.8 mm.

The cold rolling method comprises the following steps of cold rolling, wherein the cold rolling passes sequentially comprise a first rolling pass, a second rolling pass, a third rolling pass, a fourth rolling pass and a fifth rolling pass.

The first rolling pass: rolling the hot rolled blank with the thickness of 5mm into a hot rolled blank with the thickness of 3.2mm at the rolling speed of 100-200 m/min, wherein the roughness of the roller is Ra (contour arithmetic mean deviation) =0.4 +/-0.02 mu m, rz (contour maximum height) =3.2 +/-0.2 mu m and RPc (roughness peak count) = 180-200, and the rolling pass of the roller is more than 5 passes.

And the second rolling pass: and rolling the one-pass hot rolled blank with the thickness of 3.2mm into a two-pass hot rolled blank with the thickness of 2.1mm, wherein the rolling speed is 300-400 m/min, the roughness of a roller is Ra =0.32 +/-0.02 mu m, rz =2.56 +/-0.2 mu m, RPc = 160-180, and the rolling pass of the roller is more than 5 passes.

And the third rolling pass: and rolling the two hot rolled blanks with the thickness of 2.1mm into three hot rolled blanks with the thickness of 1.42mm, wherein the rolling speed is 400-500 m/min, the roughness of a roller is Ra =0.28 +/-0.01 mu m, rz =2.24 +/-0.1 mu m and RPc = 150-160, and the rolling pass of the roller is more than 5.

And the fourth rolling pass: and rolling the three hot rolled blanks with the thickness of 1.42mm into four hot rolled blanks with the thickness of 0.95mm, wherein the rolling speed is 400-500 m/min, the roughness of a roller is Ra =0.28 +/-0.01 mu m, rz =2.24 +/-0.1 mu m and RPc = 140-150, and the rolling pass of the roller is more than 16.

And cleaning the four hot rolled blanks with the thickness of 0.95mm obtained by the fourth rolling pass, performing complete recrystallization annealing, and then performing the fifth rolling pass. And after complete recrystallization annealing, the crystal grains are fine, and the appearance is close to that of isometric crystals.

And the fifth rolling pass: rolling the four hot rolled blanks with the thickness of 0.95mm into the aluminum coil with the thickness of 0.8mm, wherein the rolling speed is 300-400 m/min, the roughness of a roller is Ra =0.28 +/-0.01 mu m, rz =2.24 +/-0.1 mu m and RPc = 130-140, and the rolling pass of the roller is more than 16.

The parameters of the rolling oil used in the first rolling pass, the second rolling pass and the third rolling pass are as follows: the kinematic viscosity of the rolling oil is less than or equal to 2.8 centistokes, the acid value of the rolling oil is less than or equal to 0.20mgKOH/g, the mass percent of additives in the rolling oil is 6.0-10.0%, the light transmittance of the rolling oil is greater than or equal to 85%, the oil box test of the rolling oil is less than or equal to 2C, and the colloid of the rolling oil is less than or equal to 1000mg/100ml.

In step S3, the parameters of the rolling oil used in the fourth rolling pass and the fifth rolling pass are as follows: the kinematic viscosity of the rolling oil is less than or equal to 2 centistokes, lauric acid is added into the rolling oil to control the acid value of the rolling oil to be less than or equal to 0.20mgKOH/g, the mass percentage of the additive in the rolling oil is 6.0-7.0%, the light transmittance of the rolling oil is greater than or equal to 92%, the oil box test of the rolling oil is less than or equal to 2b, and the colloid of the rolling oil is less than or equal to 800mg/100ml. Set up like this and can guarantee that the oil is lubricated enough the time, increase the cleaning power of oil, make aluminium powder and aluminium ash on aluminium book surface get rid of more thoroughly, make the surface line of aluminium book more clear even, the glossiness is better.

The lauric acid is added to the rolling oil used in the fourth rolling pass and the fifth rolling pass to increase the cleaning capacity of the oil, because the acid value of the rolling oil is affected and changed when the rolling oil is used in the previous three rolling passes.

And cleaning the aluminum coil with the thickness of 0.8mm obtained by the fifth rolling pass, then carrying out stabilizing annealing, and then carrying out the following step S4. This arrangement removes the residual stress of the aluminum coil.

In this embodiment, the rolls used in the first rolling pass, the second rolling pass, the third rolling pass, the fourth rolling pass, and the fifth rolling pass are rolled by 3 or more passes.

Wherein, the used roller is respectively rolled by 3 or more than 3 times, and the low roughness rolling pass of the roller can be understood to have 3 or more than 3 times; that is, before the first rolling pass, the second rolling pass, the third rolling pass, the fourth rolling pass, and the fifth rolling pass are performed, the newly used rolls are respectively rolled by other materials for 3 or more passes, and then the first rolling pass, the second rolling pass, the third rolling pass, the fourth rolling pass, and the fifth rolling pass are performed.

Specifically, in the first rolling pass, the second rolling pass, and the third rolling pass, the used rolls are respectively subjected to rolling for 5 or more passes, that is, before the first rolling pass, the second rolling pass, and the third rolling pass are performed, new rolls used correspondingly are respectively subjected to rolling for 5 or more passes on other materials, and then the first rolling pass, the second rolling pass, and the third rolling pass are performed; since the surface roughness Ra, rz and RPc of the rolls are attenuated particularly fast in the first 5 passes, the surface roughness of the formed aluminum coil fluctuates largely, and the slow attenuation occurs after 5 passes, so that the surface roughness fluctuation of the formed aluminum coil is reduced.

Specifically, in the fourth rolling pass and the fifth rolling pass, the used rolls are respectively subjected to rolling for 16 or more passes, that is, before the fourth rolling pass and the fifth rolling pass are performed, the corresponding used rolls are respectively subjected to rolling for 16 or more passes on other materials, and then the fourth rolling pass and the fifth rolling pass are performed; because the attenuation degrees of the surface roughness Ra, rz and RPc of the roller are almost stable, the surface glossiness of the aluminum coil also approaches a fixed value at the moment, and the purpose of controlling the glossiness is achieved.

In this embodiment, in the rolling process of the cold rolling, in the first rolling pass to the fifth rolling pass, the three parameters of the surface roughness of the roller are gradually reduced, so that the surface roughness of the aluminum coil is also gradually reduced, and the phenomenon that large peaks and valleys are left to cause uneven surface glossiness is avoided.

In this embodiment, in the first rolling pass to the fifth rolling pass, the rolling pass of the roller may also be set to be greater than or equal to 3 passes, so that the original peak height of the aluminum coil after being rolled by the roller with low roughness can be removed by grinding, so as to superimpose the surface morphology of the new roller, and form a new surface morphology by combining with the original wave trough; if the rolling passes of the roller are few, the front appearance cannot be completely ground and removed, and the uniformity of the surface gloss of the aluminum coil is influenced.

In the present example, the rolling pass of the roll used in the cold rolling, the arithmetic mean deviation (Ra) of the profile of the roll, and the gloss contrast table of the aluminum coil are shown in fig. 2; the rolling passes of the rolls used in the cold rolling, the maximum height of the profile (Rz) of the rolls and the gloss of the aluminum coil are shown in fig. 3; the pass of the rolls used in the cold rolling, the roughness peak count (RPc) of the rolls, and the gloss contrast of the aluminum coil are shown in fig. 4.

And S4, finishing the aluminum coil to obtain an aluminum alloy strip with the thickness of 0.8 mm.

Wherein, the specific step of finishing the aluminum coil comprises:

bending and straightening the aluminum coil; the speed of stretch bending straightening is less than or equal to 80mm/min, the shape of the aluminum coil is required to be flat, the number of waves existing in each 1000mm of the aluminum coil after stretch bending straightening is less than 3, the wave height is less than or equal to 3mm, and the wavelength is greater than or equal to 500mm.

When the aluminum coil is subjected to stretch bending straightening, the aluminum coil can be cleaned.

Compared with the prior art, the preparation method of the aluminum alloy strip in the embodiment limits the thickness of the aluminum adhering layer of the roller in the rolling process of hot continuous rolling, limits the roughness of the roller in each rolling pass of cold rolling, and is matched with the process parameter limitation of each step, so that the surface gloss of the prepared aluminum alloy strip is uniform and controllable, and the aluminum alloy strip does not need to be polished subsequently, thereby reducing the production cost, improving the production efficiency, simplifying the preparation process, and simultaneously ensuring that the prepared aluminum alloy strip has excellent comprehensive mechanical property and excellent surface quality.

In addition, according to actual requirements, the preparation method of the aluminum alloy strip can also prepare the aluminum alloy strip with the thickness of 0.15-1.2 mm or the aluminum alloy strips with other thicknesses by adaptively changing the technological parameters of hot continuous rolling in the step S2, the technological parameters of cold rolling in the step S3 and the roughness of the roller in each rolling pass of cold rolling in the step S3, and ensures that the glossiness of the aluminum alloy strip is controllable, the production cost is low, the production efficiency is high, and the preparation process is simple, so that the prepared aluminum alloy meets the requirements of different customers.

The verification proves that the aluminum alloy strip is prepared by adopting the preparation method of the aluminum alloy strip, the thickness of an aluminum-adhered layer of a roller in the rolling process of hot continuous rolling is ensured to be 13 mu m, the control from the first rolling pass to the fifth rolling pass in the cold rolling process is realized, the surface roughness of the roller in the first rolling pass to the fifth rolling pass is gradually reduced, the rolling pass of the roller is more than or equal to 3 passes, and the like, so that the glossiness of the surface of the aluminum alloy can be effectively controlled, and the surface range of the glossiness vertical rolling is 10-300GU; the A company verifies that the surface gloss of 5052H32 aluminum alloy with the thickness of 0.4mm can be stably maintained at 90-100GU, the B company verifies that the surface gloss of 1060H24 aluminum alloy with the thickness of 0.15mm can be stably maintained at 160-180GU, and the surface is fine, smooth and uniform and has excellent quality.

The invention also provides an embodiment of the aluminum alloy strip, and the aluminum alloy strip is prepared by the preparation method of the aluminum alloy strip in the embodiment.

Since the aluminum alloy strip in this embodiment is made by the method for manufacturing an aluminum alloy strip in the above embodiment, the technical effect achieved by the method for manufacturing an aluminum alloy strip in the above embodiment is also achieved, and details are not described herein.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A preparation method of an aluminum alloy strip is characterized by comprising the following steps:

s1, preparing an ingot by adopting a semi-continuous casting method;

s2, carrying out hot continuous rolling on the cast ingot to obtain a hot-rolled blank with the thickness of 5 mm; wherein the thickness of the aluminum adhering layer of the roller is 11-15 μm in the rolling process of the hot continuous rolling;

s3, cold rolling the hot rolled blank to obtain an aluminum coil with the thickness of 0.8 mm; the cold rolling method comprises the following steps of performing cold rolling on a steel plate, wherein the cold rolling passes sequentially comprise a first rolling pass, a second rolling pass, a third rolling pass, a fourth rolling pass and a fifth rolling pass;

the first rolling pass: rolling the hot rolled blank with the thickness of 5mm into a hot rolled blank with the thickness of 3.2mm at the rolling speed of 100-200 m/min, wherein the roughness of a roller is Ra =0.4 +/-0.02 mu m, rz =3.2 +/-0.2 mu m and RPc = 180-200;

and the second rolling pass: rolling the one-pass hot rolled blank with the thickness of 3.2mm into a two-pass hot rolled blank with the thickness of 2.1mm, wherein the rolling speed is 300-400 m/min, the roughness of a roller is Ra =0.32 +/-0.02 mu m, rz =2.56 +/-0.2 mu m, and RPc = 160-180;

and the third rolling pass: rolling the two-pass hot-rolled blank with the thickness of 2.1mm into a three-pass hot-rolled blank with the thickness of 1.42mm, wherein the rolling speed is 400-500 m/min, the roughness of a roller is Ra =0.28 +/-0.01 mu m, rz =2.24 +/-0.1 mu m, and RPc = 150-160;

and the fourth rolling pass: rolling the three hot rolled blanks with the thickness of 1.42mm into four hot rolled blanks with the thickness of 0.95mm, wherein the rolling speed is 400-500 m/min, the roughness of a roller is Ra =0.28 +/-0.01 mu m, rz =2.24 +/-0.1 mu m, and RPc = 140-150;

and the fifth rolling pass: rolling the four hot rolled billets with the thickness of 0.95mm into the aluminum coils with the thickness of 0.8mm, wherein the rolling speed is 300-400 m/min, the roughness of the rollers is Ra =0.28 +/-0.01 mu m, rz =2.24 +/-0.1 mu m, and RPc = 130-140;

and S4, finishing the aluminum coil to obtain an aluminum alloy strip with the thickness of 0.8 mm.

2. The method for preparing an aluminum alloy strip as claimed in claim 1, wherein the rollers used in the first rolling pass, the second rolling pass, the third rolling pass, the fourth rolling pass and the fifth rolling pass are respectively subjected to 3 or more rolling passes.

3. The method of claim 2, wherein the rolls used in the first, second and third rolling passes are rolled by 5 or more passes.

4. The method of producing an aluminum alloy strip of claim 3 wherein the rolls used in the fourth and fifth passes are rolled for 16 or more passes.

5. The method for preparing the aluminum alloy strip according to claim 1, wherein in the step S2, the thickness of the aluminum-adhered layer of the rolling roll is 13 μm in the rolling process of the hot continuous rolling.

6. The method for preparing the aluminum alloy strip according to claim 1, wherein in the step S2, the brushing mark test is performed on the roller before the hot continuous rolling is performed, and the brushing mark width of the nylon brush is ensured to be 28-30 mm; the hot continuous rolling comprises hot rough rolling carried out by adopting a single stand and hot finish rolling carried out by adopting three stands in sequence, and the temperature of a roller of a third stand is more than 80 ℃ when the hot finish rolling is carried out; the finishing temperature of the hot continuous rolling is 330-350 ℃.

7. The method for producing an aluminum alloy strip according to claim 1, wherein the parameters of the rolling oil used in the first rolling pass, the second rolling pass and the third rolling pass in step S3 are as follows: the kinematic viscosity of the rolling oil is less than or equal to 2.8 centistokes, the acid value of the rolling oil is less than or equal to 0.20mgKOH/g, the mass percent of additives in the rolling oil is 6.0-10.0%, the light transmittance of the rolling oil is greater than or equal to 85%, the oil box test of the rolling oil is less than or equal to 2C, and the colloid of the rolling oil is less than or equal to 1000mg/100ml.

8. The method for producing an aluminum alloy strip according to claim 7, wherein in step S3, the parameters of the rolling oil used in the fourth rolling pass and the fifth rolling pass are as follows: the kinematic viscosity of the rolling oil is less than or equal to 2 centistokes, lauric acid is added into the rolling oil to control the acid value of the rolling oil to be less than or equal to 0.20mgKOH/g, the mass percentage of the additive in the rolling oil is 6.0-7.0%, the light transmittance of the rolling oil is greater than or equal to 92%, the oil box test of the rolling oil is less than or equal to 2b, and the colloid of the rolling oil is less than or equal to 800mg/100ml.

9. The method of making the aluminum alloy strip of claim 1, wherein the step S4 of finishing the aluminum coil comprises:

stretch bending and straightening the aluminum coil; the speed of stretch bending straightening is less than or equal to 80mm/min, the number of waves existing in each 1000mm of the aluminum coil after stretch bending straightening is less than 3, the wave height is less than or equal to 3mm, and the wavelength is greater than or equal to 500mm.

10. An aluminium alloy strip, characterized in that it is produced by the method of production of an aluminium alloy strip according to any one of claims 1 to 9.

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