Bimetal thin strip rolling composite interface strengthening method and device based on middle-pass roller texturing

Abstract

The invention discloses a bimetal thin strip rolling composite interface strengthening method and device based on middle-pass roller roughening. The method comprises the steps that basic parameters of a bimetal thin strip and rolling capacity parameters of a rolling mill are obtained; calculating the limit composite thickness of each pass based on the rolling mill capacity parameters and the basic parameters; based on the limit composite thickness, the number of passes needed by the rolling technology is determined; testing the surface appearance of the composite strip rolled in each pass, and determining the evolution rule of the surface roughness; and based on a surface roughness evolution rule, a texturing roller is adopted for rolling in the middle pass, and a smooth roller is adopted for rolling in the last pass. The texturing roller is introduced into the middle pass, so that the dissimilar metal bonding area is remarkably increased, the interface bonding strength is effectively improved, meanwhile, the deformation resistance difference of dissimilar metal is balanced, the material coordinating deformation capacity is improved, and the phenomena of brittle compound generation and shear stress concentration at the interface are restrained; therefore, the overall performance and quality of the composite thin strip are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the field of rolling technology, and in particular to a method and device for strengthening the composite interface of a bimetallic thin strip rolled based on intermediate-pass roll texturing. Background Art

[0002] With the nation's manufacturing sector undergoing transformation and upgrading, and with a growing emphasis on precision manufacturing, thin metal strips with superior performance have become a hot topic. Due to their superior surface finish, high flexibility, and numerous other advantages, thin metal strips have become a crucial raw material for micromolding and precision manufacturing. They are widely used in aerospace, nuclear power, automotive, and electrical and electronics, becoming indispensable structural and functional materials in the manufacturing industry. However, with the rapid development of these fields, the performance limitations of single metals have become increasingly prominent, making it difficult to meet the growing demand for industrial applications. Therefore, the fabrication of bimetallic composite strips has become a new approach to achieving multiple performance goals.

[0003] At present, metal composite strips mainly achieve the dual effects of mechanical bonding and metallurgical bonding at the interface through multi-pass rolling composite or annealing processes, thereby significantly improving the interface bonding strength. However, there are currently many bottlenecks in this process. As the number of rolling passes increases, the deformation of the composite strip gradually approaches the limit, and the degree of mechanical bite at the interface also tends to saturation, making it difficult to further improve the bonding strength. Due to the large difference in plastic deformation of some dissimilar metals during the deformation process, shear stress concentration is easily generated at the interface, which not only weakens the stability of the interface, but also easily causes interface cracking, thereby seriously affecting the overall performance and quality of the composite strip.

[0004] Annealing can also improve interfacial bonding strength, but during the annealing process, most dissimilar metals form brittle compounds at the interface due to element diffusion, resulting in a significant decrease in bonding strength. To address this issue, and considering the micron-scale thickness of the metal strip and the work hardening phenomenon during rolling, a method and device for strengthening the interface of bimetallic thin strip rolling composites based on intermediate roll texturing is proposed to improve the interfacial bonding strength of the metal composite strips. Summary of the Invention

[0005] The purpose of the present invention is to propose a method and device for strengthening the interface of bimetallic composite thin strips during rolling based on intermediate-pass roller texturing. Taking into account the micron-level thickness of metal thin strips and the work hardening phenomenon during rolling, a texturing roller is introduced in the intermediate pass for rolling and composite, so that the interfaces of the dissimilar metal thin strips are embedded in each other during the composite process, effectively improving the interface bonding strength. A composite rolling process calculation model is constructed, and a rolling device with texturing function is built, achieving a significant improvement in the interface bonding strength of the bimetallic composite thin strips. At the same time, the formation of brittle compounds and shear stress concentration at the interface are effectively suppressed, thereby improving the overall performance and quality of the composite thin strips.

[0006] To achieve the above object, the present invention provides a method for strengthening the composite interface of a bimetallic thin strip during rolling based on intermediate-pass roll texturing, comprising the following steps:

[0007] Obtain the basic parameters of the bimetallic strip and the rolling capacity parameters of the rolling mill;

[0008] Calculating the ultimate composite thickness of each pass based on the rolling mill capacity parameter and the basic parameters;

[0009] determining the number of passes required for the rolling process based on the limit composite thickness;

[0010] The surface morphology of the composite strip after each rolling pass was tested to determine the evolution law of the surface roughness;

[0011] Based on the surface roughness evolution law, roughening roller rolling is used in the middle pass and smooth roller rolling is used in the last pass.

[0012] Preferably, the basic parameters include: performance parameters of the base metal strip and performance parameters of the composite strip;

[0013] The performance parameters of the base metal strip include: thickness, width, surface roughness and deformation resistance;

[0014] The performance parameters of the composite thin strip include: billet thickness, rolling target thickness, rolling target deformation and equivalent deformation resistance;

[0015] The rolling capacity parameters include: roller diameter, elastic modulus, Poisson's ratio, and surface roughness of the smooth roller and the textured roller.

[0016] Preferably, the method for calculating the limit composite thickness includes: integrating the mill capacity parameters with the composite strip performance parameters, and using the minimum rollable thickness calculation formula to calculate the nth pass limit composite thickness h min (n):

[0017]

[0018] Wherein, μ represents the friction coefficient during rolling; K eq represents the equivalent deformation resistance; v represents the Poisson's ratio of the roll; E represents the elastic modulus of the roll; and D represents the diameter of the roll.

[0019] Preferably, the n-th pass deformation ε is calculated based on the n-th pass limit composite thickness n :

[0020] ε n =h min (n)-h min (n-1)

[0021] Among them, h min (n-1) is the limit composite thickness of the previous pass;

[0022] According to the deformation of the composite strip per pass ε n , calculate the total deformation h after n rolling passes:

[0023]

[0024] When the total deformation after the nth rolling When, and h min (n)≤H f , determine the rolling process rolling pass number as N=n.

[0025] Preferably, the method for determining the evolution law of the surface roughness includes: using a three-dimensional profilometer to test the upper and lower surface morphologies of the composite strip after each rolling pass and collect data; determining the evolution law of the surface morphology of the metal composite thin strip, including the surface roughness and the average width Rsm and peak value Rku of the profile unit.

[0026] Preferably, when the difference between the surface roughness of the strip and the surface roughness of the roller after the nth rolling pass is less than a preset calculation accuracy, texturing roller rolling is adopted.

[0027] The present invention also provides a device for strengthening the composite interface of bimetallic thin strips by rolling based on intermediate-pass roll texturing. The device is used to implement the above method and includes: an acquisition module, a calculation module, a determination module, a test module, and a rolling module;

[0028] The acquisition module is used to obtain basic parameters of the bimetallic strip and rolling capacity parameters of the rolling mill;

[0029] The calculation module is used to calculate the limit composite thickness of each pass based on the rolling mill capacity parameter and the basic parameters;

[0030] The determination module is used to determine the number of passes required for the rolling process based on the limit composite thickness;

[0031] The testing module is used to test the surface morphology of the composite strip after each rolling pass to determine the evolution law of the surface roughness;

[0032] The rolling module is used for adopting roughening roller rolling in the middle pass and smooth roller rolling in the last pass based on the surface roughness evolution law.

[0033] Preferably, the basic parameters include: performance parameters of the base metal strip and performance parameters of the composite strip;

[0034] The performance parameters of the base metal strip include: thickness, width, surface roughness and deformation resistance;

[0035] The performance parameters of the composite thin strip include: billet thickness, rolling target thickness, rolling target deformation and equivalent deformation resistance;

[0036] The rolling capacity parameters include: roller diameter, elastic modulus, Poisson's ratio, and surface roughness of the smooth roller and the textured roller.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] During the smooth roller cold rolling process, the hardness of the working roller is much higher than that of the metal substrate. As the cumulative reduction rate increases, the topography of the roller surface is gradually transferred to the strip surface. For metal composite thin strips, a textured roller is used on the side of the base material with greater deformation resistance. The micron-level peaks on the roller surface "press, rub and plow" the strip surface during the rolling process, forming micron-level "concave and convex pits" on the surface of the strip in contact with the roller. Due to the micron-level thickness of the strip and the "hardening phenomenon" during the rolling process, the "concave and convex pits" are further transferred to the bonding interface (the reverse side of the strip), forming corresponding "convex and concave pits". This process significantly increases the bonding area between the dissimilar metals. Hard metals are more easily mechanically pressed into soft metals, effectively improving the bonding strength between dissimilar metals.

[0039] During the cold rolling process, when the upper and lower working rolls are textured, the degree of transfer of the rollers to the surface of the composite strip will also vary due to the different equivalent deformation resistance of the dissimilar metals. Specifically, materials with low deformation resistance usually have the properties of low hardness and high ductility. During the rolling process, the transfer rate is high, and the diameter and depth of the micron-level "concave and convex pits" on their surface under the action of compressive stress are larger. Compared with materials with high deformation resistance, materials with high hardness and low ductility have low transfer rates during the rolling process, and the diameter and depth of the micron-level "concave and convex pits" on the surface of the strip under the action of compressive stress are smaller. To a certain extent, this effectively balances the deformation resistance differences of dissimilar metals and improves the coordinated deformation ability of metal composite thin strip materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 Schematic diagram of a method flow in an embodiment of the present invention;

[0042] Figure 2 Graph showing the evolution of the steel substrate morphology on the surface during the composite rolling process of a bimetallic thin strip according to an embodiment of the present invention; wherein (a) represents when n=1; (b) represents when n=2; (c) represents when n=3; (d) represents when n=4; (e) represents when n=5; and (f) represents when n=6.

[0043] Figure 3 Graph showing the evolution of the aluminum substrate morphology on the lower surface during the composite rolling process of a bimetallic thin strip according to an embodiment of the present invention; wherein (a) represents when n=1; (b) represents when n=2; (c) represents when n=3; (d) represents when n=4; (e) represents when n=5; and (f) represents when n=6.

[0044] Figure 4 Schematic diagram of a textured roller and a smooth roller according to an embodiment of the present invention; wherein (a) represents a textured roller; (b) represents a smooth roller;

[0045] Figure 5 This is a rolling process flow chart of an embodiment of the present invention;

[0046] Figure 6 This is a comparison diagram of the bonding strength of the bimetallic strips before and after the application of the technology of the embodiment of the present invention. DETAILED DESCRIPTION

[0047] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0048] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] Example 1

[0050] like Figure 1 FIG. 1 is a flow chart of a method according to an embodiment of the present invention, and the steps include:

[0051] S1. Obtain the basic parameters of the bimetallic strip and the rolling capacity parameters of the rolling mill.

[0052] In order to illustrate the application process of the relevant technology of the present invention, the implementation process of the interface strengthening method of bimetallic thin strip rolling composite based on intermediate pass roll roughening is introduced in detail by taking the rolling composite of 0.1mm thick 5052 series aluminum alloy and 0.1mm thick 304 stainless steel strip as an example.

[0053] First, the thickness of the base aluminum alloy and stainless steel strips l1 and l2 are both 0.1 mm, the width b1 and b2 are both 30 mm, the surface roughness Ra1 and Ra2 are 0.23 μm and 0.21 μm respectively, the yield strength σ1 and σ2 are 90 MPa and 305 MPa respectively, and the deformation resistance is:

[0054] K 1(1) =σ 1(1) l 1(1) b1=90×0.1×30=270MPa,

[0055] K 2(1) =σ 2(1) l 2(1) b2=305×0.1×30=915MPa.

[0056] Determine the thickness of the composite thin strip group blank H0=l1+l2=0.1+0.1=0.2, the rolling target thickness H f =0.075mm, rolling target deformation ΔH=H0-H f =0.2-0.075=0.125, equivalent deformation resistance K of the composite strip eq(1) :

[0057]

[0058] Then, the rolling capacity of the rolling mill is obtained, where the roll diameter D = 150 mm, the roll elastic modulus E = 350 GPa, the roll Poisson's ratio v = 0.22, and the surface roughness of the smooth roll Ra r1 =0.1, roughness of texturing roller Ra r2 =0.57.

[0059] S2. Calculate the ultimate composite thickness of each pass based on the mill capacity parameters and basic parameters.

[0060] Integrate the mill capacity parameters with the composite thin strip performance parameters, and use the calculation formula for the minimum rollable thickness of the thin strip to calculate the limit composite thickness of the nth pass (the various parameter indicators are shown in Table 1):

[0061]

[0062] Wherein, μ represents the friction coefficient during rolling; μ=μ0+k×(Rar+Ra n ), μ0 represents the reference friction coefficient, k represents the friction coefficient, Ra 1n , Ra 2n Indicates the surface roughness of the two metals at the entrance of the nth rolling pass, where the surface roughness of the smooth roller is Ra r1 ≤0.1μm, surface roughness Ra of texturing roller r2 >0.1μm;K eq represents the equivalent deformation resistance; v represents the Poisson's ratio of the roll; E represents the elastic modulus of the roll; D represents the roll diameter; h represents the roll diameter; min (n) represents the ultimate composite thickness of the nth pass.

[0063] Table 1

[0064]

[0065] S3. Determine the number of passes required for the rolling process based on the ultimate composite thickness.

[0066] Calculate the deformation ε of the nth pass according to the limit composite thickness of the nth pass n :

[0067] ε n =h min (n)-h min (n-1)

[0068] Among them, h min (n-1) is the ultimate composite thickness of the previous pass.

[0069] According to the deformation of the composite strip per pass ε n , calculate the total deformation h after n rolling passes:

[0070]

[0071] Here, i represents a constant.

[0072] In this embodiment, the total deformation is:

[0073]

[0074] When the total deformation after n passes of rolling When, and h min (n)≤H f , determine the rolling process rolling pass number is N = n; in this embodiment h min (6)=0.07≤H f =0.075, so the rolling process is determined to have N=6 rolling passes.

[0075] S4. Test the surface morphology of the composite strip after each rolling pass to determine the evolution law of the surface roughness.

[0076] The top and bottom surface morphologies of the composite strip after each rolling pass are measured and collected using a three-dimensional profilometer (in this embodiment, a Keyence shape profile laser measuring device VK-X is used). The surface morphology evolution law of the metal composite thin strip is determined based on the total number of rolling passes and the surface morphology of the smooth roller, such as Figure 2 、 Figure 3 and as shown in Table 2.

[0077] Table 2

[0078]

[0079] S5. Based on the evolution law of surface roughness, roughening roller rolling is used in the middle pass and smooth roller rolling is used in the last pass.

[0080] When n times Ra 1n (Ra 2n )=0.9~1.1Ra r1 , n+1 pass to determine the working roll to replace the textured roll rolling. In this embodiment, Ra 14 =0.11≤1.1Ra r =1.1×0.1, it is determined that the fifth pass is rolled with a textured roller, where the textured roller Ra r2 It is 0.57μm.

[0081] The degree of texture on the surface of the textured work roll is expressed by the average value of the horizontal distance between adjacent peaks and valleys or valley peaks, Rsm (average width of the contour unit), and the sharpness of the height distribution, Rku (peakedness). The expressions of Rsm and Rku are as follows:

[0082]

[0083] Where i represents a constant; X si is the length of a single contour unit (i.e., the distance between adjacent peaks and valleys); R q (Root mean square roughness) is the root mean square value of the surface profile deviation from the mean line; t is the total number of sampling points, Z i is the height measurement value of each point on the surface profile, is the arithmetic mean of the profile height. In this embodiment, Rsm is 89.1 μm and Rku is 3.13. Figure 4 As shown in (a).

[0084] Finally, in the sixth pass, the composite strip is rolled using a smooth roller to achieve a smooth surface. Figure 4 (b) shown.

[0085] The above process flow is as follows Figure 5 As shown, the comparison of the bonding strength of the bimetallic thin strips before and after the application of the technology is as follows Figure 6 shown.

[0086] Example 2

[0087] This embodiment also provides a bimetallic thin strip rolling composite interface strengthening device based on intermediate pass roll texturing, including: an acquisition module, a calculation module, a determination module, a test module and a rolling module.

[0088] The following will describe in detail how the present invention solves technical problems in practical work in conjunction with this embodiment.

[0089] First, the acquisition module is used to obtain the basic parameters of the bimetallic strip and the rolling capacity parameters of the rolling mill.

[0090] In order to illustrate the application process of the relevant technology of the present invention, the implementation process of the interface strengthening method of bimetallic thin strip rolling composite based on intermediate pass roll roughening is introduced in detail by taking the rolling composite of 0.1mm thick 5052 series aluminum alloy and 0.1mm thick 304 stainless steel strip as an example.

[0091] First, the thickness of the base aluminum alloy and stainless steel strips l1 and l2 are both 0.1 mm, the width b1 and b2 are both 30 mm, the surface roughness Ra1 and Ra2 are 0.23 μm and 0.21 μm respectively, the yield strength σ1 and σ2 are 90 MPa and 305 MPa respectively, and the deformation resistance is:

[0092] K 1(1) =σ 1(1) l 1(1) b1=90×0.1×30=270MPa,

[0093] K 2(1) =σ 2(1) l 2(1) b2=305×0.1×30=915MPa.

[0094] Determine the thickness of the composite thin strip group blank H0=l1+l2=0.1+0.1=0.2, the rolling target thickness H f =0.075mm, rolling target deformation ΔH=H0-H f =0.2-0.075=0.125, equivalent deformation resistance K of the composite strip eq(1) :

[0095]

[0096] Then, the rolling capacity of the rolling mill is obtained, where the roll diameter D = 150 mm, the roll elastic modulus E = 350 GPa, the roll Poisson's ratio v = 0.22, and the surface roughness of the smooth roll Ra r1 =0.1, roughness of texturing roller Ra r2 =0.57.

[0097] The calculation module is then used to calculate the ultimate composite thickness of each pass based on the mill capacity parameters and basic parameters.

[0098] Integrate the mill capacity parameters with the composite thin strip performance parameters, and use the calculation formula for the minimum rollable thickness of the thin strip to calculate the limit composite thickness of the nth pass (the various parameter indicators are shown in Table 1):

[0099]

[0100] Wherein, μ represents the friction coefficient during rolling; μ=μ0+k×(Rar+Ra n ), μ0 represents the reference friction coefficient, k represents the friction coefficient, Ra 1n , Ra 2n Indicates the surface roughness of the two metals at the entrance of the nth rolling pass, where the surface roughness of the smooth roller is Ra r1 ≤0.1μm, surface roughness Ra of texturing roller r2 >0.1μm;K eq represents the equivalent deformation resistance; v represents the Poisson's ratio of the roll; E represents the elastic modulus of the roll; D represents the roll diameter; h represents the roll diameter; min (n) represents the ultimate composite thickness of the nth pass.

[0101] The determination module determines the number of passes required for the rolling process based on the limit composite thickness. The deformation amount ε of the nth pass is calculated based on the limit composite thickness of the nth pass. n :

[0102] ε n =h min (n)-h min (n-1)

[0103] Among them, h min (n-1) is the ultimate composite thickness of the previous pass.

[0104] According to the deformation of the composite strip per pass ε n , calculate the total deformation h after n rolling passes:

[0105]

[0106] Here, i represents a constant.

[0107] In this embodiment, the total deformation is:

[0108]

[0109] When the total deformation after n passes of rolling When, and h min (n)≤H f , determine the rolling process rolling pass number is N = n; in this embodiment h min (6)=0.07≤H f =0.075, so the rolling process is determined to have N=6 rolling passes.

[0110] The test module is used to test the surface morphology of the composite strip after each rolling pass to determine the evolution law of the surface roughness.

[0111] The upper and lower surface morphologies of the composite strip after each rolling pass are tested and collected using a three-dimensional profilometer (in this embodiment, a Keyence shape profile laser measuring device VK-X is used). The evolution law of the surface morphology of the metal composite thin strip is determined based on the total number of rolling passes and the surface morphology of the smooth roller, such as Figure 2 、 Figure 3 and as shown in Table 2.

[0112] Finally, based on the surface roughness evolution law, the rolling module adopts roughening roller rolling in the middle pass and smooth roller rolling in the last pass.

[0113] When n times Ra 1n (Ra 2n )=0.9~1.1Ra r1 , n+1 pass to determine the working roll to replace the textured roll rolling. In this embodiment, Ra 14 =0.11≤1.1Ra r =1.1×0.1, it is determined that the fifth pass is rolled with a textured roller, where the textured roller Ra r2 It is 0.57μm.

[0114] The degree of texture on the surface of the textured work roll is expressed by the average value of the horizontal distance between adjacent peaks and valleys or valley peaks, Rsm (average width of the contour unit), and the sharpness of the height distribution, Rku (peakedness). The expressions of Rsm and Rku are as follows:

[0115]

[0116] Where i represents a constant; X si is the length of a single contour unit (i.e., the distance between adjacent peaks and valleys); R q (Root mean square roughness) is the root mean square value of the surface profile deviation from the mean line; t is the total number of sampling points, Z i is the height measurement value of each point on the surface profile, is the arithmetic mean of the profile height. In this embodiment, Rsm is 89.1 μm and Rku is 3.13.

[0117] Finally, in the sixth pass, the composite strip is rolled using a smooth roller to achieve a smooth surface. Figure 4 (b) shown.

[0118] The above process flow is as follows Figure 5 As shown, the comparison of the bonding strength of the bimetallic thin strips before and after the application of the technology is as follows Figure 6 shown.

[0119] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A method for strengthening the composite interface of bimetallic thin strips by rolling based on intermediate roll texturing, characterized in that: The following steps are involved: Obtain the basic parameters of the bimetallic strip and the rolling capacity parameters of the rolling mill; Calculating the ultimate composite thickness of each pass based on the rolling mill capacity parameter and the basic parameters; determining the number of passes required for the rolling process based on the limit composite thickness; The surface morphology of the composite strip after each rolling pass was tested to determine the evolution law of the surface roughness; Based on the surface roughness evolution law, roughening roller rolling is used in the middle pass and smooth roller rolling is used in the last pass.

2. The method for strengthening the composite interface of bimetallic thin strips by rolling based on intermediate-pass roll texturing according to claim 1, characterized in that: The basic parameters include: performance parameters of the base metal strip and performance parameters of the composite strip; The performance parameters of the base metal strip include: thickness, width, surface roughness and deformation resistance; The performance parameters of the composite thin strip include: billet thickness, rolling target thickness, rolling target deformation and equivalent deformation resistance; The rolling capacity parameters include: roller diameter, elastic modulus, Poisson's ratio, and surface roughness of the smooth roller and the textured roller.

3. The method for strengthening the composite interface of bimetallic thin strips by rolling based on intermediate roll texturing according to claim 2, characterized in that: The method for calculating the limit composite thickness includes: integrating the mill capacity parameter and the composite strip performance parameter, and using the minimum rollable thickness calculation formula to calculate the limit composite thickness h of the nth pass. min (n): Wherein, μ represents the friction coefficient during rolling; K eq represents the equivalent deformation resistance; v represents the Poisson's ratio of the roll; E represents the elastic modulus of the roll; and D represents the diameter of the roll.

4. The method for strengthening the composite interface of bimetallic thin strips by rolling based on intermediate-pass roll texturing according to claim 3, characterized in that: Calculate the deformation ε of the nth pass according to the limit composite thickness of the nth pass n : ε n =h min (n)-h min (n-1) Among them, h min (n-1) is the limit composite thickness of the previous pass; According to the deformation of the composite strip per pass ε n , calculate the total deformation h after n rolling passes: When the total deformation after the nth rolling When, and h min (n)≤H f , determine the rolling process rolling pass number as N=n.

5. The method for strengthening the composite interface of bimetallic thin strips by rolling based on intermediate-pass roll texturing according to claim 1, characterized in that: The method for determining the surface roughness evolution law includes: using a three-dimensional profilometer to test the upper and lower surface morphologies of the composite strip after each rolling pass and collect data; determining the surface morphology evolution law of the metal composite thin strip, including the surface roughness and the average width Rsm and peak value Rku of the profile unit.

6. The method for strengthening the composite interface of bimetallic thin strips by rolling based on intermediate roll texturing according to claim 1, characterized in that: When the difference between the surface roughness of the strip and the surface roughness of the roller after the nth rolling pass is less than the preset calculation accuracy, roughening roller rolling is adopted.

7. A device for strengthening the composite interface of bimetallic thin strips by rolling based on intermediate-pass roll texturing, the device being used to implement the method according to any one of claims 1 to 6, characterized in that: include: Acquisition module, calculation module, determination module, testing module and rolling module; The acquisition module is used to obtain basic parameters of the bimetallic strip and rolling capacity parameters of the rolling mill; The calculation module is used to calculate the limit composite thickness of each pass based on the rolling mill capacity parameter and the basic parameters; The determination module is used to determine the number of passes required for the rolling process based on the limit composite thickness; The testing module is used to test the surface morphology of the composite strip after each rolling pass to determine the evolution law of the surface roughness; The rolling module is used for adopting roughening roller rolling in the middle pass and smooth roller rolling in the last pass based on the surface roughness evolution law.

8. The device for strengthening the composite interface of bimetallic thin strips during rolling based on intermediate-pass roll texturing according to claim 7, characterized in that: The basic parameters include: performance parameters of the base metal strip and performance parameters of the composite strip; The performance parameters of the base metal strip include: thickness, width, surface roughness and deformation resistance; The performance parameters of the composite thin strip include: billet thickness, rolling target thickness, rolling target deformation and equivalent deformation resistance; The rolling capacity parameters include: roller diameter, elastic modulus, Poisson's ratio, and surface roughness of the smooth roller and the textured roller.

Images