Roll system structure capable of improving surface stress state of metal ultra-thin strip and rolling method

Abstract

The invention discloses a roll system structure capable of improving the surface stress state of a metal ultra-thin strip and a rolling method, the roll system structure comprises a concave working roll and a convex working roll, the groove part of the concave working roll is wedged with the convex part of the convex working roll, and the roll diameters of non-working areas at the two ends of the concave working roll and the convex working roll are the same. The groove part of the concave working roll and the convex part of the convex working roll are subjected to surface strengthening treatment, the groove part of the concave working roll is subjected to laser texturing treatment, and the convex part of the convex working roll is flat and smooth. According to the roll system structure provided by the invention, through surface strengthening treatment, the abrasion of micron-level micro bulges and micro pits on the surface is reduced, and the embedding of nano particles is prevented, so that the service life of the concave working roll and the convex working roll is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of metal ultra-thin strip rolling, and specifically relates to a roller system structure and a rolling method capable of improving the surface stress state of the metal ultra-thin strip. Background Art

[0002] With the development of science and technology, folding screens are widely used in mobile phones, tablet computers and other devices. However, folding screens are prone to defects such as creases and cracks during use, which greatly affects the widespread application of folding screen devices in life. Therefore, the preparation of ultra-thin strip materials with excellent folding performance has become the key to overcoming this problem. The thickness of ultra-thin metal strips is usually less than 0.1mm, and has excellent strength and conductivity. It has broad development prospects in the preparation of flexible circuit boards and flexible electronic products. At present, common methods for improving the surface stress state of metals include mechanical grinding, shot peening, rolling, etc., but these processes are suitable for thicker metal plates and are not suitable for improving the surface stress state of ultra-thin strips. Therefore, there is an urgent need for a method to improve the surface stress state of ultra-thin metal strips. Summary of the invention

[0003] In view of the above problems, the present invention provides a roller system structure and a rolling method which can improve the surface stress state of an ultra-thin metal strip.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A roller system structure capable of improving the surface stress state of an extremely thin metal strip comprises a concave working roller and a convex working roller, wherein the concave portion of the concave working roller is wedged with the convex portion of the convex working roller, the roller diameters of the non-working areas at both ends of the concave working roller and the convex working roller are the same, the concave portion of the concave working roller and the convex portion of the convex working roller are both subjected to surface strengthening treatment, the concave portion of the concave working roller is subjected to laser texturing treatment, and the convex portion of the convex working roller is flat and smooth.

[0006] Furthermore, the concave groove portion of the concave working roll and the convex portion of the convex working roll are both subjected to surface strengthening treatment, specifically, the concave groove portion of the concave working roll and the convex portion of the convex working roll are subjected to nitriding or carburizing treatment.

[0007] Furthermore, the groove portion of the concave working roller is subjected to laser roughening treatment, specifically, the laser treatment is used to make the groove portion of the concave working roller evenly distributed with micro protrusions and micro pits, and the micro protrusions and micro pits are hemispherical.

[0008] Furthermore, the groove of the concave working roller has a depth of 20-100 μm and a width of 1-40 cm, and the height of the micro-protrusions and the depth of the micro-pits are both 0.3-1.0 μm.

[0009] A rolling method for improving the surface stress state of an ultra-thin metal strip comprises the following steps:

[0010] Step S1, using anhydrous ethanol to clean the concave part of the concave working roll and the convex part of the convex working roll and drying them, installing the cleaned concave working roll and the convex working roll on the micro-rolling mill, and arranging the concave working roll above the convex working roll, and the concave part of the concave working roll is wedged with the convex part of the convex working roll;

[0011] Step S2, adding nanoparticles and dispersant into water, and performing high-speed stirring and ultrasonic vibration treatment to prepare an emulsion for standby use;

[0012] Step S3, cleaning the surface of the metal ultra-thin strip with anhydrous ethanol and drying it, and placing it on a dust-free paper for later use;

[0013] Step S4, starting the micro-rolling mill, and spraying the emulsion prepared in step S2 evenly on the rotating concave working roll;

[0014] Step S5, after the emulsion is evenly dispersed, the ultra-thin metal strip cleaned in step S3 is placed between a concave working roll and a convex working roll for thinning or constant thickness rolling, thereby improving the surface stress state of the ultra-thin metal strip;

[0015] Step S6, cleaning the surface of the ultra-thin metal strip after rolling in step S5 with anhydrous ethanol and drying it to obtain an ultra-thin metal strip with good performance.

[0016] Furthermore, the nanoparticles in step S2 are metal oxides, graphene or sulfides.

[0017] Furthermore, when the nanoparticles are metal oxides, they can be TiO2, CuO, Al2O3 or Fe3O4, and when the nanoparticles are sulfides, they are MoS2.

[0018] Furthermore, in step S2, the particle size of the nanoparticles is 10-500 nm; and the mass ratio of the nanoparticles, the dispersant and the water in the emulsion is 1:1:98.

[0019] Furthermore, in step S3, the thickness of the ultra-thin metal strip is 10-100 μm, and the material is any one of copper, aluminum, copper alloy, aluminum alloy, magnesium alloy, stainless steel or titanium.

[0020] Furthermore, during the rolling process of step S5, the roll gap between the concave working roll and the convex working roll is 10-100 μm, and the rolling speed is 0.1-1 m / min.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] In the rolling method of the present invention, the prepared emulsion is evenly sprayed on the working area of ​​the working roll, so that the nanoparticles are attached to the micro-protrusions and micro-pits in the groove part of the concave working roll, and then the metal ultra-thin strip is thinned or rolled at a constant thickness in the groove part. Under the joint action of the micro-protrusions and micro-pits at the micron level and the nanoparticles, the surface stress state of the metal ultra-thin strip changes, so that the surface stress state of the metal ultra-thin strip is changed from tensile stress to compressive stress, thereby improving the surface stress state of the metal ultra-thin strip and improving the folding and fatigue resistance of the metal ultra-thin strip. The method has the advantages of low cost, high efficiency, cleanliness and no pollution, and is suitable for mass production of high-quality ultra-thin strips.

[0023] The roller system structure proposed in the present invention reduces the wear of micron-level micro-protrusions and micro-pits on the surface and prevents the embedding of nanoparticles through surface strengthening treatment, thereby extending the service life of the concave working roller and the convex working roller;

[0024] The roll system structure of the present invention adopts a concave working roll and a convex working roll, and the concave part of the concave working roll is wedged with the convex part of the convex working roll, thereby avoiding direct contact between the concave part of the concave working roll and the convex part of the convex working roll, thereby reducing the wear of the roll surface and facilitating the improvement of the service life of the roll.

[0025] During the rolling process of the present invention, the surface stress state of the ultra-thin metal strip changes under the combined action of micro-protrusions and micro-pits at the micron level and nanoparticles. Nanoparticles of different particle sizes and concentrations or different rolling parameters can be selected according to the surface roughness of the ultra-thin metal strip, thereby achieving controllable surface stress state of the ultra-thin metal strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a front view of the roller system structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the cooperation between the concave working roll and the convex working roll in the rolling method of the present invention;

[0028] Figure 3 Schematic diagram of rolling of concave working roll and ultra-thin metal strip when nanoparticles are not added;

[0029] Figure 4 It is a schematic diagram of rolling of a concave working roll and an extremely thin metal strip when the particle size of nanoparticles is similar to the depth of micro-pits;

[0030] Figure 5 Schematic diagram of rolling of concave working roll and ultra-thin metal strip when the particle size of nanoparticles is much smaller than the depth of micro-pits;

[0031] In the figure, 1 is the concave working roll, 2 is the convex working roll, and 3 is the extremely thin metal strip. DETAILED DESCRIPTION

[0032] In order to further illustrate the technical solution of the present invention, the present invention is further described below through embodiments.

[0033] Example 1

[0034] like Figure 1 , Figure 2 As shown, a roller system structure capable of improving the surface stress state of an ultra-thin metal strip comprises a concave working roller 1 and a convex working roller 2, wherein the concave groove portion of the concave working roller 1 is wedged with the convex portion of the convex working roller 2, the roller diameters of the non-working areas at both ends of the concave working roller 1 and the convex working roller 2 are the same, the depth of the concave groove portion of the concave working roller 1 is 20 μm, and the width is 40 cm, the concave groove portion of the concave working roller 1 and the convex portion of the convex working roller 2 are both subjected to surface strengthening treatment, specifically, the concave groove portion of the concave working roller 1 and the convex portion of the convex working roller 2 are subjected to nitriding or carburizing treatment; the concave groove portion of the concave working roller 1 is subjected to laser texturing treatment, specifically, micro-protrusions and micro-pits are uniformly distributed on the concave working roller 1 through laser treatment, the micro-protrusions and micro-pits are hemispherical, the height of the micro-protrusions and the depth of the micro-pits are both 0.3 μm, and the convex portion of the convex working roller 2 is flat and smooth.

[0035] like Figures 3 to 5 As shown, a rolling method for improving the surface stress state of an ultra-thin metal strip specifically comprises the following steps:

[0036] Step S1, cleaning the concave part of the concave working roll 1 and the convex part of the convex working roll 2 with anhydrous ethanol and drying them, installing the cleaned concave working roll 1 and the convex working roll 2 on the micro-rolling mill, and arranging the concave working roll 1 above the convex working roll 2, and the concave part of the concave working roll 1 and the convex part of the convex working roll 2 are wedged;

[0037] Step S2, adding TiO2 nanoparticles and a dispersant into water, and performing high-speed stirring and ultrasonic vibration treatment to prepare an emulsion for standby use, wherein the mass ratio of TiO2 nanoparticles, dispersant and water in the emulsion is 1:1:98, and the particle size of the TiO2 nanoparticles is 10 nm;

[0038] Step S3, cleaning the surface of the metal ultra-thin strip 3 with a length of 50 cm, a width of 20 cm, and a thickness of 10 μm with anhydrous ethanol and drying it, and placing it on dust-free paper for standby use, wherein the material of the metal ultra-thin strip 3 is stainless steel;

[0039] Step S4, starting the micro-rolling mill, and evenly spraying the emulsion prepared in step S2 on the rotating concave working roll 1;

[0040] Step S5, after the emulsion is evenly dispersed, the cleaned metal ultra-thin strip 3 in step S3 is placed between the concave working roll 1 and the convex working roll 2 for thinning or constant thickness rolling, thereby improving the surface stress state of the metal ultra-thin strip 3. During the rolling process, the roll gap between the concave working roll 1 and the convex working roll 2 is 10 μm, and the rolling speed is 0.5 m / min;

[0041] Step S6, cleaning the surface of the extremely thin metal strip 3 after rolling in step S5 with anhydrous ethanol and drying it to obtain an extremely thin metal strip 3 with good performance.

[0042] Example 2

[0043] like Figure 1 , Figure 2 As shown, a roller system structure capable of improving the surface stress state of an ultra-thin metal strip comprises a concave working roller 1 and a convex working roller 2, wherein the concave portion of the concave working roller 1 is wedged with the convex portion of the convex working roller 2, the roller diameters of the non-working areas at both ends of the concave working roller 1 and the convex working roller 2 are the same, the depth of the concave portion of the concave working roller 1 is 50 μm, and the width is 20 cm, the concave portion of the concave working roller 1 and the convex portion of the convex working roller 2 are both subjected to surface strengthening treatment, specifically, the concave portion of the concave working roller 1 and the convex portion of the convex working roller 2 are subjected to nitriding or carburizing treatment; the concave portion of the concave working roller 1 is subjected to laser texturing treatment, specifically, the concave portion of the concave working roller 1 is uniformly distributed with micro-protrusions and micro-pits through laser treatment, the micro-protrusions and micro-pits are hemispherical, the height of the micro-protrusions and the depth of the micro-pits are both 0.5 μm, and the convex portion of the convex working roller 2 is flat and smooth.

[0044] like Figures 3 to 5 As shown, a rolling method for improving the surface stress state of an ultra-thin metal strip specifically comprises the following steps:

[0045] Step S1, cleaning the concave part of the concave working roll 1 and the convex part of the convex working roll 2 with anhydrous ethanol and drying them, installing the cleaned concave working roll 1 and the convex working roll 2 on the micro-rolling mill, and arranging the concave working roll 1 above the convex working roll 2, and the concave part of the concave working roll 1 and the convex part of the convex working roll 2 are wedged;

[0046] Step S2, adding CuO nanoparticles and a dispersant into water, and performing high-speed stirring and ultrasonic vibration treatment to prepare an emulsion for standby use, wherein the mass ratio of CuO nanoparticles, dispersant and water in the emulsion is 1:1:98, and the particle size of the CuO nanoparticles is 500 nm;

[0047] Step S3, cleaning the surface of the metal ultra-thin strip 3 with a length of 15 cm, a width of 10 cm, and a thickness of 100 μm with anhydrous ethanol and drying it, and placing it on dust-free paper for later use, wherein the material of the metal ultra-thin strip 3 is copper;

[0048] Step S4, starting the micro-rolling mill, and evenly spraying the emulsion prepared in step S2 on the rotating concave working roll 1;

[0049] Step S5, after the emulsion is evenly dispersed, the cleaned metal ultra-thin strip 3 in step S3 is placed between the concave working roll 1 and the convex working roll 2 for thinning or constant thickness rolling, thereby improving the surface stress state of the metal ultra-thin strip 3. During the rolling process, the roll gap between the concave working roll 1 and the convex working roll 2 is 100 μm, and the rolling speed is 1 m / min;

[0050] Step S6, cleaning the surface of the extremely thin metal strip 3 after rolling in step S5 with anhydrous ethanol and drying it to obtain an extremely thin metal strip 3 with good performance.

[0051] Example 3

[0052] like Figure 1 , Figure 2 As shown, a roller system structure capable of improving the surface stress state of an ultra-thin metal strip comprises a concave working roller 1 and a convex working roller 2, wherein the concave portion of the concave working roller 1 is wedged with the convex portion of the convex working roller 2, the roller diameters of the non-working areas at both ends of the concave working roller 1 and the convex working roller 2 are the same, the depth of the concave portion of the concave working roller 1 is 50 μm, and the width is 4 cm, the concave portion of the concave working roller 1 and the convex portion of the convex working roller 2 are both subjected to surface strengthening treatment, specifically, the concave portion of the concave working roller 1 and the convex portion of the convex working roller 2 are subjected to nitriding or carburizing treatment; the concave portion of the concave working roller 1 is subjected to laser texturing treatment, specifically, the concave portion of the concave working roller 1 is uniformly distributed with micro-protrusions and micro-pits through laser treatment, the micro-protrusions and micro-pits are hemispherical, the height of the micro-protrusions and the depth of the micro-pits are both 0.5 μm, and the convex portion of the convex working roller 2 is flat and smooth.

[0053] like Figures 3 to 5 As shown, a rolling method for improving the surface stress state of an ultra-thin metal strip specifically comprises the following steps:

[0054] Step S1, cleaning the concave part of the concave working roll 1 and the convex part of the convex working roll 2 with anhydrous ethanol and drying them, installing the cleaned concave working roll 1 and the convex working roll 2 on the micro-rolling mill, and arranging the concave working roll 1 above the convex working roll 2, and the concave part of the concave working roll 1 and the convex part of the convex working roll 2 are wedged;

[0055] Step S2, adding Al2O3 nanoparticles and a dispersant into water, and performing high-speed stirring and ultrasonic vibration treatment to prepare an emulsion for standby use, wherein the mass ratio of Al2O3 nanoparticles, dispersant and water in the emulsion is 1:1:98, and the particle size of the Al2O3 nanoparticles is 300 nm;

[0056] Step S3, cleaning the surface of the metal ultra-thin strip 3 with a length of 15 cm, a width of 2 cm, and a thickness of 50 μm with anhydrous ethanol and drying it, and placing it on dust-free paper for standby use, wherein the material of the metal ultra-thin strip 3 is aluminum;

[0057] Step S4, starting the micro-rolling mill, and evenly spraying the emulsion prepared in step S2 on the rotating concave working roll 1;

[0058] Step S5, after the emulsion is evenly dispersed, the cleaned metal ultra-thin strip 3 in step S3 is placed between the concave working roll 1 and the convex working roll 2 for thinning or constant thickness rolling, thereby improving the surface stress state of the metal ultra-thin strip 3. During the rolling process, the roll gap between the concave working roll 1 and the convex working roll 2 is 30 μm, and the rolling speed is 0.5 m / min;

[0059] Step S6, cleaning the surface of the extremely thin metal strip 3 after rolling in step S5 with anhydrous ethanol and drying it to obtain an extremely thin metal strip 3 with good performance.

[0060] Example 4

[0061] like Figure 1 , Figure 2 As shown, a roller system structure capable of improving the surface stress state of an ultra-thin metal strip comprises a concave working roller 1 and a convex working roller 2, wherein the concave portion of the concave working roller 1 is wedged with the convex portion of the convex working roller 2, the roller diameters of the non-working areas at both ends of the concave working roller 1 and the convex working roller 2 are the same, the depth of the concave portion of the concave working roller 1 is 100 μm, and the width is 10 cm, the concave portion of the concave working roller 1 and the convex portion of the convex working roller 2 are both subjected to surface strengthening treatment, specifically, the concave portion of the concave working roller 1 and the convex portion of the convex working roller 2 are subjected to nitriding or carburizing treatment; the concave portion of the concave working roller 1 is subjected to laser texturing treatment, specifically, the concave portion of the concave working roller 1 is uniformly distributed with micro-protrusions and micro-pits through laser treatment, the micro-protrusions and micro-pits are hemispherical, the height of the micro-protrusions and the depth of the micro-pits are both 1 μm, and the convex portion of the convex working roller 2 is flat and smooth.

[0062] like Figures 3 to 5 As shown, a rolling method for improving the surface stress state of an ultra-thin metal strip specifically comprises the following steps:

[0063] Step S1, cleaning the concave part of the concave working roll 1 and the convex part of the convex working roll 2 with anhydrous ethanol and drying them, installing the cleaned concave working roll 1 and the convex working roll 2 on the micro-rolling mill, and arranging the concave working roll 1 above the convex working roll 2, and the concave part of the concave working roll 1 and the convex part of the convex working roll 2 are wedged;

[0064] Step S2, adding MoS2 nanoparticles and a dispersant to water, and performing high-speed stirring and ultrasonic vibration treatment to prepare an emulsion for standby use, wherein the mass ratio of MoS2 nanoparticles, dispersant and water in the emulsion is 1:1:98, and the particle size of the MoS2 nanoparticles is 50nm;

[0065] Step S3, cleaning the surface of the metal ultra-thin strip 3 with a length of 15 cm, a width of 5 cm, and a thickness of 50 μm with anhydrous ethanol and drying it, and placing it on dust-free paper for standby use, wherein the material of the metal ultra-thin strip 3 is stainless steel;

[0066] Step S4, starting the micro-rolling mill, and evenly spraying the emulsion prepared in step S2 on the rotating concave working roll 1;

[0067] Step S5, after the emulsion is evenly dispersed, the cleaned metal ultra-thin strip 3 in step S3 is placed between the concave working roll 1 and the convex working roll 2 for thinning or constant thickness rolling, thereby improving the surface stress state of the metal ultra-thin strip 3. During the rolling process, the roll gap between the concave working roll 1 and the convex working roll 2 is 30 μm, and the rolling speed is 0.5 m / min;

[0068] Step S6, cleaning the surface of the extremely thin metal strip 3 after rolling in step S5 with anhydrous ethanol and drying it to obtain an extremely thin metal strip 3 with good performance.

[0069] Example 5

[0070] like Figure 1 , Figure 2As shown, a roller system structure capable of improving the surface stress state of an ultra-thin metal strip comprises a concave working roller 1 and a convex working roller 2, wherein the concave groove portion of the concave working roller 1 is wedged with the convex portion of the convex working roller 2, the roller diameters of the non-working areas at both ends of the concave working roller 1 and the convex working roller 2 are the same, the depth of the concave groove portion of the concave working roller 1 is 20 μm, and the width is 1 cm, the concave groove portion of the concave working roller 1 and the convex portion of the convex working roller 2 are both subjected to surface strengthening treatment, specifically, the concave groove portion of the concave working roller 1 and the convex portion of the convex working roller 2 are subjected to nitriding or carburizing treatment; the concave groove portion of the concave working roller 1 is subjected to laser texturing treatment, specifically, micro-protrusions and micro-pits are uniformly distributed on the concave working roller 1 through laser treatment, the micro-protrusions and micro-pits are hemispherical, the height of the micro-protrusions and the depth of the micro-pits are both 0.3 μm, and the convex portion of the convex working roller 2 is flat and smooth.

[0071] like Figures 3 to 5 As shown, a rolling method for improving the surface stress state of an ultra-thin metal strip specifically comprises the following steps:

[0072] Step S1, cleaning the concave part of the concave working roll 1 and the convex part of the convex working roll 2 with anhydrous ethanol and drying them, installing the cleaned concave working roll 1 and the convex working roll 2 on the micro-rolling mill, and arranging the concave working roll 1 above the convex working roll 2, and the concave part of the concave working roll 1 and the convex part of the convex working roll 2 are wedged;

[0073] Step S2, adding TiO2 nanoparticles and a dispersant into water, and performing high-speed stirring and ultrasonic vibration treatment to prepare an emulsion for standby use, wherein the mass ratio of TiO2 nanoparticles, dispersant and water in the emulsion is 1:1:98, and the particle size of the TiO2 nanoparticles is 30 nm;

[0074] Step S3, cleaning the surface of the metal ultra-thin strip 3 with a length of 15 cm, a width of 1 cm, and a thickness of 50 μm with anhydrous ethanol and drying it, and placing it on dust-free paper for later use, wherein the material of the metal ultra-thin strip 3 is titanium;

[0075] Step S4, starting the micro-rolling mill, and evenly spraying the emulsion prepared in step S2 on the rotating concave working roll 1;

[0076] Step S5, after the emulsion is evenly dispersed, the cleaned metal ultra-thin strip 3 in step S3 is placed between the concave working roll 1 and the convex working roll 2 for thinning or constant thickness rolling, thereby improving the surface stress state of the metal ultra-thin strip 3. During the rolling process, the roll gap between the concave working roll 1 and the convex working roll 2 is 50 μm, and the rolling speed is 0.1 m / min;

[0077] Step S6, cleaning the surface of the extremely thin metal strip 3 after rolling in step S5 with anhydrous ethanol and drying it to obtain an extremely thin metal strip 3 with good performance.

[0078] The nanoparticles in the above embodiment may also be graphene or Fe3O4; the material of the metal ultra-thin strip 3 may also be copper alloy, aluminum alloy or magnesium alloy.

[0079] The particle size of the nanoparticles is selected based on the surface roughness of the metal ultra-thin strip 3. The greater the surface roughness of the metal ultra-thin strip 3, the larger the particle size of the corresponding nanoparticles.

[0080] like Figure 4-5 The schematic diagram of rolling without adding nanoparticles and the schematic diagram of rolling with adding nanoparticles of different particle sizes are shown. It can be seen from the figure that when no nanoparticles are added, the contact area between the metal ultra-thin strip 3 and the concave working roll 1 during rolling is large, the introduced residual compressive stress is uneven, and the wear on the roll surface is large. When the particle size of the added nanoparticles is similar to the depth of the micro-pits, the wear of the roll can be effectively reduced during rolling. When the particle size of the added nanoparticles is much smaller than the depth of the micro-pits, not only can the wear of the roll be reduced during rolling, but the surface roughness can also be reduced through the action of the nanoparticles, making the residual stress more uniform.

[0081] The above shows and describes the main features and advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0082] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A roller system structure capable of improving the surface stress state of an ultra-thin metal strip, Features: The invention comprises a concave working roll (1) and a convex working roll (2), wherein the concave portion of the concave working roll (1) is wedged with the convex portion of the convex working roll (2), the roller diameters of the non-working areas at both ends of the concave working roll (1) and the convex working roll (2) are the same, the concave portion of the concave working roll (1) and the convex portion of the convex working roll (2) are both subjected to surface strengthening treatment, the concave portion of the concave working roll (1) is subjected to laser texturing treatment, and the convex portion of the convex working roll (2) is flat and smooth.

2. A roller system structure capable of improving the surface stress state of an ultra-thin metal strip according to claim 1, Features: The concave groove portion of the concave working roller (1) and the convex portion of the convex working roller (2) are both subjected to surface strengthening treatment, specifically, the concave groove portion of the concave working roller (1) and the convex portion of the convex working roller (2) are subjected to nitriding or carburizing treatment.

3. A roller system structure capable of improving the surface stress state of an ultra-thin metal strip according to claim 2, Features: The groove portion of the concave working roller (1) is subjected to laser roughening treatment, specifically, the laser treatment is used to evenly distribute micro-protrusions and micro-pits on the groove portion of the concave working roller (1), and the micro-protrusions and micro-pits are hemispherical.

4. A roller system structure capable of improving the surface stress state of an ultra-thin metal strip according to claim 3, Features: The groove of the concave working roller (1) has a depth of 20-100 μm and a width of 1-40 cm. The height of the micro-protrusions and the depth of the micro-pits are both 0.3-1.0 μm.

5. A rolling method for improving the surface stress state of an ultra-thin metal strip using the roller system structure of claim 4, Features: The specific steps include: Step S1, using anhydrous ethanol to clean the concave portion of the concave working roll (1) and the convex portion of the convex working roll (2) and dry them, installing the cleaned concave working roll (1) and the convex working roll (2) on a micro-rolling mill, with the concave working roll (1) arranged above the convex working roll (2), and the concave portion of the concave working roll (1) and the convex portion of the convex working roll (2) being wedged; Step S2, adding the nanoparticles and the dispersant into water, and subjecting the water to high-speed stirring and ultrasonic vibration treatment to prepare an emulsion for standby use; Step S3, cleaning the surface of the metal ultra-thin strip (3) with anhydrous ethanol and drying it, and placing it on a dust-free paper for later use; Step S4, starting the micro-rolling mill and evenly spraying the emulsion prepared in step S2 onto the rotating concave working roll (1); Step S5, after the emulsion is evenly dispersed, the ultra-thin metal strip (3) cleaned in step S3 is placed between the concave working roll (1) and the convex working roll (2) for thinning or constant thickness rolling, thereby improving the surface stress state of the ultra-thin metal strip (3); Step S6, cleaning the surface of the extremely thin metal strip (3) after rolling in step S5 with anhydrous ethanol and drying it to obtain an extremely thin metal strip (3) with good performance.

6. A rolling method for improving the surface stress state of an ultra-thin metal strip according to claim 5, Features: The nanoparticles in step S2 are metal oxides, graphene or sulfides.

7. A rolling method for improving the surface stress state of an ultra-thin metal strip according to claim 6, Features: When the nanoparticles are metal oxides, they may be TiO 2 , CuO, Al 2 O 3 or Fe 3 O 4 , when the nanoparticles are sulfides, they are MoS 2 .

8. A rolling method for improving the surface stress state of an ultra-thin metal strip according to claim 5, Features: In the step S2, the particle size of the nanoparticles is 10-500 nm; the mass ratio of the nanoparticles, the dispersant and the water in the emulsion is 1:1:

98.

9. A rolling method for improving the surface stress state of an ultra-thin metal strip according to claim 5, Features: In the step S3, the thickness of the metal ultra-thin strip (3) is 10-100 μm, and the material is any one of copper, aluminum, copper alloy, aluminum alloy, magnesium alloy, stainless steel or titanium.

10. A rolling method for improving the surface stress state of an ultra-thin metal strip according to claim 5, Features: During the rolling process of step S5, the roll gap between the concave working roll (1) and the convex working roll (2) is 10-100 μm, and the rolling speed is 0.1-1 m / min.

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