Equipment and methods for customizing the front and back morphological structures of Invar alloy ultrathin strips

Abstract

This invention discloses equipment and methods for customizing the front and back surface morphology of Invar alloy ultra-thin strips, belonging to the field of Invar alloy ultra-thin strip processing. The equipment includes work rolls with differentiated surface morphologies, a first intermediate roll with a polyurethane-based organic material coating, an ultrasonic bearing device, an integrated tension weighted control system, and a central control unit. By configuring different surface roughnesses on the upper and lower work rolls, combined with the stable transverse compressive stress provided by the first intermediate roll and axial ultrasonic vibration, asymmetric plastic flow and morphology replication of the metal on both sides of the strip are achieved. During the rolling process, by coordinating the adjustment of the roll shifting amount of the first intermediate roll and the convexity of the backing roll saddle, plate shape defects caused by frictional differences are dynamically compensated, ultimately achieving customized production of 15μm thick 4J36 Invar alloy ultra-thin strips, with different surface roughnesses on sides A and B, meeting the specific requirements of the fine metal mask hole forming process for the substrate surface condition.

Description

Technical Field

[0001] This invention relates to the field of precision metal rolling technology, and in particular to an equipment and method for customizing the front and back morphological structures of Invar alloy ultrathin strips. Background Technology

[0002] OLED display technology has become the mainstream display solution due to its superior performance. Its manufacturing process relies on fine metal masks (FMMs) to achieve precise pixel deposition. The FMM requires an ultra-thin strip of 4J36 Invar alloy as the substrate. This alloy has an extremely low coefficient of thermal expansion, which can ensure dimensional stability during the high-temperature deposition process.

[0003] Currently, domestic FMM production mostly uses 4J36 Invar alloy strip with a thickness of approximately 40μm, which requires subsequent etching for thinning. This process is costly and restricts the development of thinner and more precise products. In addition, the FMM hole-forming process requires the strip to have different surface morphologies on the front and back sides, while traditional rolling processes are difficult to achieve precise control of the front and back morphologies while thinning, and are prone to plate shape defects such as edge waviness and center waviness.

[0004] Therefore, there is an urgent need for equipment and methods that can simultaneously achieve ultra-thin strip reduction, front and back morphology customization, and plate shape coordination control during the rolling process. Summary of the Invention

[0005] The purpose of this invention is to provide an equipment and method for customizing the front and back morphology of Invar alloy ultrathin strips, in order to solve the problems in the prior art that ultrathin strips are difficult to further thin, the front and back morphology cannot be differentiated and controlled, and the plate quality is poor.

[0006] To achieve the above objectives, the present invention provides equipment for customizing the front and back morphological structures of Invar alloy ultrathin strips, comprising:

[0007] Work roll, first intermediate roll, ultrasonic bearing device, integrated tension weighted control system and central control unit;

[0008] The working roll includes an upper working roll and a lower working roll, and the roller surfaces of the upper working roll and the lower working roll have non-uniform microstructures.

[0009] The surface of the first intermediate roller is covered with an organic material coating layer, which is in contact with the work roller;

[0010] The ultrasonic bearing device is installed on the drive side shaft end of the first intermediate roller, and the ultrasonic bearing device is used to apply axial ultrasonic vibration to the first intermediate roller.

[0011] The integrated tension weighted control system is connected to the uncoiler and coiler of the rolling mill for real-time detection and adjustment of strip tension;

[0012] The central control unit is communicatively connected to both the ultrasonic bearing device and the integrated tension weighted control system, and is used to perform coordinated control.

[0013] Preferably, the surface roughness of the upper working roller ranges from 0.167 μm to 0.222 μm, and the surface roughness of the lower working roller ranges from 0.089 μm to 0.107 μm.

[0014] As a direct forming module, the working roll prefabricates the required non-uniform microstructure on the roll surface. The morphology of the upper and lower roll surfaces is independent of each other in terms of geometric features, distribution density, or spatial phase, so as to achieve synchronous rolling forming of the irregular structure on the front and back sides of the strip.

[0015] Preferably, the organic material coating layer is a polyurethane-based composite material.

[0016] The first intermediate roll has an organic material coating layer, which is a polyurethane-based composite material. This coating gives it high elasticity and toughness, low wear characteristics, and a small sound velocity attenuation coefficient, allowing it to serve as a highly efficient waveguide medium and ensure minimal loss of ultrasonic vibration energy. The organic material coating layer contacts the surface of the work roll, forming both a sound wave transmission interface and a physical buffer interface, used to isolate mechanical wear and guide ultrasonic energy. Simultaneously, it can flexibly adapt to the convexity adjustment of the backing roll saddle, thereby ensuring precise changes in the position and intensity of the lateral compressive stress exerted by the first intermediate roll on the work roll.

[0017] Preferably, the ultrasonic amplification device is connected to a multi-channel ultrasonic controller, which can independently control the output power, frequency, and operating mode of each channel.

[0018] An ultrasonic clamping device is loaded onto the drive-side shaft end of the first intermediate roll via a clamp to apply axial ultrasonic vibration to the first intermediate roll. This vibration is transmitted to the work roll via an organic material coating layer to actively regulate the interfacial friction between the work roll and the strip contact area. According to Coulomb's law, friction... ,pressure and coefficient of friction The relationship is: Each ultrasonic bonding device is connected to an independent multi-channel ultrasonic controller. The multi-channel ultrasonic controller can independently program and control the output power, frequency, and operating mode of each channel, providing an independent active control method to achieve differentiated frictional states and plastic flow behavior on the upper and lower surfaces of the strip. The multi-channel ultrasonic controller can apply ultrasound to the first intermediate roll; the ultrasonic formula is:

[0019]

[0020]

[0021] in, The distance from the source of the event; The amplitude; Angular frequency; Wave number; For time; The initial angle; The speed at which sound waves propagate in a medium; λ is the wavelength.

[0022] Preferably, the integrated tension weighted control system includes a tension sensing network, a servo actuator, and a multivariable control algorithm module;

[0023] The tension sensing network is used to collect strip tension values ​​in real time.

[0024] The servo actuator is used to drive the uncoiler and the winding machine;

[0025] The multivariable control algorithm module is used to perform proportional-integral-derivative compensation based on tension deviation.

[0026] The integrated tension weighted control system is connected to the servo drive units of the uncoiler and coiler of the rolling mill. The tension sensing network can detect and collect the actual tension value of the strip in real time. The servo actuator is driven by a high dynamic response servo motor to drive the uncoiler and coiler of the rolling mill. The multivariable control algorithm module presets an "ideal tension curve" and performs proportional-integral-derivative precise compensation based on the deviation between the measured value of the tension meter and the target value, providing a constant coiling tension for shape customization.

[0027] Preferably, the diameter of the first intermediate roller is 29 mm and the taper of the first intermediate roller is 0.001875.

[0028] Preferably, it also includes a backing roller saddle, wherein the axial movement of the first intermediate roller and the convexity of the backing roller saddle are adjustable, for coordinating the adjustment of the position and intensity of the lateral compressive stress of the work roller.

[0029] Preferably, the central control unit is configured to: synchronously adjust the tension setpoint of the integrated tension weighted control system when the ultrasonic bearing device is activated or its parameters are changed, resulting in a change in the friction coefficient.

[0030] Preferably, it also includes a lubricating oil supply system, which is used to supply lubricating oil at a temperature of 30°C to 40°C to the rolling zone.

[0031] A rolling method for customizing the front and back morphology of Invar alloy ultrathin strips, using the aforementioned equipment, includes the following steps:

[0032] Step 1: Configure the surface roughness of the upper and lower work rolls so that the roughness of the upper work roll is higher than that of the lower work roll.

[0033] Step 2: Establish lateral compressive stress support for the work roll (10) through the first intermediate roll;

[0034] Step 3: Perform multi-pass rolling, utilizing the differential friction effect between the upper and lower work rolls to drive asymmetric plastic flow and morphology replication on both sides of the strip.

[0035] Step 4: In each rolling pass, based on real-time plate shape defects, coordinate the adjustment of the roll shifting amount of the first intermediate roll and the convexity of the backing roll saddle.

[0036] Step 5: Through the cumulative effect of multiple rolling passes, the customized evolution of the surface morphology of the front and back sides of the strip is achieved.

[0037] Compared with the prior art, the present invention has the following advantages and technical effects:

[0038] 1. This invention enables the direct precision rolling of 4J36 Invar alloy ultrathin strips with thicknesses ranging from 40μm to 15μm, breaking through the thickness limit of traditional processes and eliminating the expensive subsequent etching and thinning process.

[0039] 2. This invention achieves independent and precise control of the surface state of the front and back sides of the strip by combining the surface morphology design of the working roll, ultrasonic active friction control and flexible stress support, thus meeting the specific requirements of FMM for the heterogeneous morphology of the substrate on both sides.

[0040] 3. This invention forms a systematic plate shape solution. By dynamically coordinating the control of the convexity of the first intermediate roll and the backing roll, it effectively overcomes the plate shape problem caused by friction asymmetry in ultra-thin strip rolling and ensures the ultra-high flatness of the product.

[0041] 4. The equipment and method of this invention have a high degree of integration and strong controllability, providing a reliable raw material preparation technology for the industrial production of high-quality fine metal photomasks, and have significant industrial application value. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1This is a schematic diagram of the surface morphology of the working roller of the present invention, wherein (a) is a schematic diagram of the surface morphology of the upper working roller and (b) is a schematic diagram of the surface morphology of the lower working roller.

[0044] Figure 2 This is a schematic diagram of the structure of the first intermediate roller and the axial ultrasonic device of the present invention.

[0045] Figure 3 This is a schematic diagram of the first intermediate roller shifting control of the present invention.

[0046] Figure 4 This is a schematic diagram of the crown adjustment for each rolling pass in this invention.

[0047] Figure 5 This is a schematic diagram illustrating the variation of the average roughness of the ultrathin strip in this invention.

[0048] Figure 6 This is a three-dimensional profile of the surface of the 4J36 Invar alloy ultrathin strip of the present invention.

[0049] Figure 7 This is a graph showing the surface roughness variation of the ultra-thin strip at different passes in this invention.

[0050] Figure 8 This is a graph showing the variation of rolling tension in each pass of the present invention.

[0051] Among them, 1 is the working roll; 2 is the first intermediate roll; 3 is the ultrasonic bearing device; 11 is the upper working roll; 12 is the lower working roll; and 21 is the organic material coating layer. Detailed Implementation

[0052] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other. The described embodiments are merely some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention. The invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0053] This invention provides equipment for customizing the front and back morphological structures of Invar alloy ultrathin strips, comprising:

[0054] 1. Working roll; 2. First intermediate roll; 3. Ultrasonic bearing device; 4. Integrated tension weighted control system and central control unit;

[0055] The working roll 1 includes an upper working roll 11 and a lower working roll 12, and the roller surfaces of the upper working roll 11 and the lower working roll 12 have non-uniform microstructure structures.

[0056] The surface of the first intermediate roller 2 is provided with an organic material coating layer 21, and the organic material coating layer 21 is in contact with the work roller 1;

[0057] The ultrasonic bearing device 3 is installed on the drive side shaft end of the first intermediate roller 2. The ultrasonic bearing device 3 is used to apply axial ultrasonic vibration to the first intermediate roller 2.

[0058] The integrated tension weighted control system is connected to the uncoiler and coiler of the rolling mill for real-time detection and adjustment of strip tension;

[0059] The central control unit is communicatively connected to the ultrasonic bearing device 3 and the integrated tension weighted control system to perform coordinated control.

[0060] Further optimization of the scheme resulted in the surface roughness range of the upper working roller 11 being 0.167μm to 0.222μm, and the surface roughness range of the lower working roller 12 being 0.089μm to 0.107μm.

[0061] The scheme was further optimized so that the organic material coating layer 21 is a polyurethane-based composite material.

[0062] The solution has been further optimized by connecting the ultrasonic enhancement device 3 to a multi-channel ultrasonic controller, which can independently control the output power, frequency and working mode of each channel.

[0063] Further optimization of the scheme resulted in an integrated tension weighted control system comprising a tension sensing network, a servo actuator, and a multivariable control algorithm module.

[0064] Tension sensing networks are used to acquire strip tension values ​​in real time;

[0065] Servo actuators are used to drive the uncoiler and the winding machine;

[0066] The multivariable control algorithm module is used to perform proportional-integral-derivative compensation based on tension deviation.

[0067] Further optimization of the scheme: the diameter of the first intermediate roller 2 is 29mm, and the taper of the first intermediate roller 2 is 0.001875.

[0068] Further optimization of the scheme also includes a backing roller saddle, and the axial movement of the first intermediate roller 2 and the convexity of the backing roller saddle are adjustable, which are used to coordinate the adjustment of the position and intensity of the lateral compressive stress of the work roller 1.

[0069] In a further optimized scheme, the central control unit is configured to: synchronously adjust the tension setpoint of the integrated tension weighted control system when the ultrasonic bearing device 3 is activated or its parameters are changed, resulting in a change in the friction coefficient.

[0070] Further optimization of the scheme also includes a lubricating oil supply system, which is used to supply lubricating oil at a temperature of 30℃~40℃ to the rolling zone.

[0071] Example 1

[0072] The equipment of this invention is based on a 280mm reversible twenty-roll mill.

[0073] like Figures 1 to 2 As shown, the rolling equipment provided by the present invention mainly includes a work roll 1, a first intermediate roll 2, an ultrasonic bearing device 3, an integrated tension weighted control system, and a central control unit.

[0074] As a direct forming component, the working roll 1 has its surface pre-fabricated with the required microstructure through methods such as laser etching, sandblasting, or electrochemical treatment. The surface roughness Ra of the upper working roll 11 is controlled between 0.167 μm and 0.222 μm, and the surface roughness Ra of the lower working roll 12 is controlled between 0.089 μm and 0.107 μm. The morphology of the upper and lower rolls can be independently designed in terms of geometric features (such as protrusion shape and height), distribution density (such as the number of protrusions per unit area), or spatial phase (such as arrangement pattern) to achieve synchronous replication of the irregular structure on both sides of the strip.

[0075] The surface of the first intermediate roller 2 is covered with an organic material coating layer 21, preferably a polyurethane-based composite material, which possesses characteristics such as high elasticity, low wear, and low sound velocity attenuation. This layer serves both as a waveguide medium for ultrasonic waves, reducing vibration energy loss, and as a mechanical buffer layer, isolating direct wear between the work roller 1 and the intermediate roller. The first intermediate roller 2 has a diameter of Φ29mm and a taper of 0.001875. Through its structural design and the flexibility of the coating layer, it can be adapted to the convexity adjustment of the backing roller saddle, thereby precisely changing the lateral compressive stress distribution on the work roller 1.

[0076] The ultrasonic clamping device 3 is mounted on the drive-side shaft end of the first intermediate roller 2 via a clamp. Its core is a piezoelectric ceramic transducer, which can generate axial ultrasonic vibration. The vibration frequency can be adjusted within the range of 20kHz to 40kHz, and the amplitude can be controlled by voltage. The ultrasonic clamping device 3 is connected to a multi-channel ultrasonic controller, and the output parameters of each channel can be set independently to achieve independent control of the friction state of the upper and lower working roller areas.

[0077] The integrated tension weighted control system includes a tension sensor network located at the mill inlet and outlet, high-dynamic servo motors and their controllers driving the uncoiler and coiler, and a built-in multivariable PID control algorithm. The system acquires strip tension signals in real time, compares them with a preset "ideal tension curve," and outputs compensation commands through PID calculations to adjust the servo motor speed and maintain tension stability.

[0078] The central control unit is an industrial computer or PLC, integrating a collaborative control algorithm. This unit receives in real time the status parameters of the ultrasonic bearing device 3, the detection data of the tension sensor, and the feedback signal from the plate shape analyzer. When the adjustment of the ultrasonic parameters causes a change in the friction coefficient, the central control unit automatically adjusts the tension setpoint of the integrated tension weighted control system to achieve dynamic coordination between friction and stress.

[0079] Example 2

[0080] like Figures 3 to 8 As shown, taking 4J36 Invar alloy strip coil (initial thickness 40μm, width 225mm) as an example, the six-pass rolling process is as follows:

[0081] Upper and lower work rolls with different surface roughness are configured to establish initial friction conditions different from those on the front and back sides of the strip. The roughness of the upper work roll 11 is controlled in the range of 0.167 μm to 0.222 μm to provide a higher friction interface; the roughness of the lower work roll 12 is controlled in the range of 0.089 μm to 0.107 μm to provide a lower friction interface.

[0082] The transverse compressive stress of the first intermediate roll 2 is configured to ensure that the work roll 1 maintains high rigidity and achieves accurate transfer of micron-level morphology during the rolling process. The transverse compressive stress of the first intermediate roll 2 is established by the first intermediate roll 2 with a diameter of Φ29mm and a taper of 0.001875, maintaining stable compressive stress support for the work roll 1.

[0083] Multi-pass rolling is performed, utilizing the differential friction effect induced by the different roughness of the upper and lower work rolls, and combined with the stable compressive stress provided by the first intermediate roll 2, to drive the metal on both sides of the strip to produce asymmetric plastic flow and morphology replication.

[0084] In each pass, based on the real-time plate shape defects, it is necessary to coordinate the adjustment of the amount of the first intermediate roll 2 shifting and the convexity value of the backing roll saddle, change the position and intensity of the lateral compressive stress of the first intermediate roll 2 on the work roll 1, and specifically compensate for the asymmetric deformation caused by friction differences in order to correct the plate shape.

[0085] To address the obvious double-sided wave defect in the first pass, a larger adjustment amount for the first intermediate roll 2 (e.g., the upper first intermediate roll 2 shifts by 15mm, and the lower first intermediate roll 2 shifts by 5mm) is used. By applying asymmetrical lateral compressive stress, the deflection of the work roll 1 is macroscopically corrected. In subsequent passes, as the plate shape improves, the adjustment range of the first intermediate roll 2 is gradually reduced, and the backing roll convexity is used to perform more precise roll gap shape correction. At this time, the compressive stress provided by the first intermediate roll 2 mainly plays a stabilizing and supporting role.

[0086] Customization of the surface morphology on both sides is achieved through the cumulative effect of multiple rolling passes: the surface morphology evolution of the A side of the strip is dominated by higher frictional shear force under the interaction with the high-roughness upper working roll 11; the surface morphology evolution of the B side of the strip is dominated by lower frictional shear force under the interaction with the low-roughness lower working roll 12.

[0087] During the cumulative process of multi-pass rolling, the stable compressive stress provided by the first intermediate roll 2 ensures the rigidity of the work roll 1, so that the differential roughness of the upper and lower work rolls can be clearly and stably transferred to the surface of the strip. This achieves a precise and controllable evolution of the roughness of surface A from 0.379μm to 0.422μm to 0.683μm to 0.754μm and surface B from 0.281μm to 0.318μm to 0.691μm to 0.759μm.

[0088] The rolling process uses lubricating oil for lubrication and cooling. The temperature of the lubricating oil is controlled within the range of 30 to 40°C to stabilize the friction state of the rolling interface. Together with the mechanical compressive stress provided by the first intermediate roll 2, it constitutes the physical condition guarantee for achieving customized morphology.

[0089] The specific rolling process is as follows:

[0090] P1: The first pass reduction rate is 25.00%, the initial tension is 1.94 kN, the subsequent tension is 1.86 kN, the rolling force is 171 kN, the lateral movement of the upper first intermediate roll 2 is +15 mm, the lateral movement of the lower first intermediate roll 2 is +5 mm, and the initial crown is 0. The surface roughness of the upper work roll 11 is 0.196 μm to 0.222 μm, and the surface roughness of the lower work roll 12 is 0.089 μm to 0.099 μm. After the start of rolling, the 4J36 Invar alloy ultra-thin strip exhibits significant double-sided waviness. Adjusting the crowns 1 to 5 to -8, -5.22, 0, -5.34, and -7.1 respectively improves the double-sided waviness but it still exists. After stabilization, the rolling speed is increased to 5 m / min. After the first rolling pass, the thickness of the 4J36 Invar alloy ultrathin strip is 30μm, the surface roughness of surface A is 0.379μm~0.422μm, and the surface roughness of surface B is 0.281μm~0.318μm.

[0091] P2: To address the double-sided wave problem present during the first rolling pass, before the start of the second rolling pass, the lateral movement of the upper first intermediate roll 2 was adjusted to +10.1 mm, and the lateral movement of the lower first intermediate roll 2 was adjusted to +0.1 mm. Simultaneously, the crown adjustment was preset, with crowns 1 to 5 set to +0.52, +0.71, +0.93, +0.76, and +0.54, respectively. The reduction rate for the second pass was 16.67%, the pre-tension was 1.68 kN, the post-tension was 1.58 kN, and the rolling force was 190 kN. The surface roughness of the upper work roll 11 was 0.176 μm to 0.213 μm, and the surface roughness of the lower work roll 12 was 0.096 μm to 0.107 μm. After the rolling process began, the 4J36 Invar alloy ultra-thin strip exhibited unilateral waviness on the drive side. Adjusting the crown 1 to crown 5 resulted in +0.52, +0.4, +0.73, -2.30, and -3.17 respectively, significantly improving the waviness compared to the first pass, but it still persisted. After the second rolling pass, the 4J36 Invar alloy ultra-thin strip thickness was 25 μm, with surface roughness of 0.432 μm–0.544 μm on surface A and 0.377 μm–0.410 μm on surface B.

[0092] P3: To address the small single-sided waviness issue on the drive side during the second rolling pass, before the start of the third rolling pass, the lateral movement of the upper first intermediate roll 2 was maintained at +10.1 mm, and the lateral movement of the lower first intermediate roll 2 was adjusted to +0.1 mm. The reduction rate for the third pass was 12.00%, the front tension was 1.06 kN, the rear tension was 0.94 kN, the rolling force was 192 kN, and the initial crown was 0. The roughness of the upper work roll 11 was 0.168 μm to 0.207 μm, and the roughness of the lower work roll 12 was 0.092 μm to 0.107 μm. After the start of rolling, local shape issues occurred in the 4J36 Invar alloy ultra-thin strip. The crowns 1 to 5 were adjusted to -0.13, 0, -0.15, -0.15, and 0, respectively, effectively resolving the single-sided waviness. After the third rolling pass, the 4J36 Invar alloy ultrathin strip has a thickness of 22μm, a surface roughness of 0.514μm~0.618μm on surface A, and a surface roughness of 0.485μm~0.537μm on surface B.

[0093] P4: After the first three passes, the 4J36 Invar alloy ultra-thin strip has a good shape, so no further roll adjustment or crown preset is needed. The fourth pass has a reduction rate of 13.62%, a front tension of 1.02 kN, a rear tension of 0.92 kN, a rolling force of 215 kN, and an initial crown of 0. The surface roughness of the upper work roll 11 is 0.164 μm to 0.199 μm, and the surface roughness of the lower work roll 12 is 0.094 μm to 0.107 μm. After rolling begins, the 4J36 Invar alloy ultra-thin strip exhibits localized shape problems. Adjusting the crowns 1 to 5 to -0.07, 0, 0, 0, and -0.05 respectively effectively resolves these localized shape issues. After the fourth rolling pass, the 4J36 Invar alloy ultrathin strip has a thickness of 19μm, a surface roughness of 0.541μm~0.637μm on surface A, and a surface roughness of 0.570μm~0.652μm on surface B.

[0094] P5: The fifth pass reduction rate is 10.50%, the initial tension is 1.06 kN, the subsequent tension is 0.96 kN, the rolling force is 238 kN, and the initial crown is 0. The surface roughness of the upper work roll 11 is 0.167 μm to 0.200 μm, and the surface roughness of the lower work roll 12 is 0.090 μm to 0.107 μm. After the start of rolling, the 4J36 Invar alloy ultra-thin strip had local shape problems. Adjusting the crown 1 to crown 5 to 0, -0.12, 0, -0.19, and -0.40 respectively effectively solved the local shape problems. After the fifth pass of rolling, the thickness of the 4J36 Invar alloy ultra-thin strip is 17 μm, the initial surface roughness of the upper work roll 11 is 0.209 μm, and the initial surface roughness of the lower work roll 12 is 0.102 μm. The surface roughness of surface A is 0.619 μm to 0.738 μm, and the surface roughness of surface B is 0.636 μm to 0.715 μm.

[0095] P6: The reduction rate for the sixth pass was 11.76%, the initial tension was 0.72 kN, the subsequent tension was 0.66 kN, the rolling force was 273 kN, and the initial crown was 0. The surface roughness of the upper work roll 11 was 0.186 μm to 0.234 μm, and the surface roughness of the lower work roll 12 was 0.092 μm to 0.107 μm. After the start of rolling, the 4J36 Invar alloy ultra-thin strip had local shape problems. Adjusting the crowns 1 to 5 to 0, 0, -0.07, -0.25, and 0 respectively effectively solved the local shape problems. After the sixth pass of rolling, the thickness of the 4J36 Invar alloy ultra-thin strip was 15 μm, the surface roughness of surface A was 0.683 μm to 0.754 μm, and the surface roughness of surface B was 0.691 μm to 0.759 μm.

[0096] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for customizing the front and back morphological structures of Invar alloy ultrathin strips, characterized in that, include: Work roll, first intermediate roll, ultrasonic bearing device, integrated tension weighted control system and central control unit; The working roll includes an upper working roll and a lower working roll, and the roller surfaces of the upper working roll and the lower working roll have non-uniform microstructures. The surface of the first intermediate roller is covered with an organic material coating layer, which is in contact with the work roller; The ultrasonic bearing device is installed on the drive side shaft end of the first intermediate roller, and the ultrasonic bearing device is used to apply axial ultrasonic vibration to the first intermediate roller. The integrated tension weighted control system is connected to the uncoiler and coiler of the rolling mill for real-time detection and adjustment of strip tension. The central control unit is communicatively connected to both the ultrasonic bearing device and the integrated tension weighted control system, and is used to perform coordinated control.

2. The equipment for customizing the front and back morphological structures of Invar alloy ultrathin strips according to claim 1, characterized in that, The surface roughness range of the upper working roller is 0.167μm to 0.222μm, and the surface roughness range of the lower working roller is 0.089μm to 0.107μm.

3. The equipment for customizing the front and back morphological structures of Invar alloy ultrathin strips according to claim 1, characterized in that, The organic material coating layer is a polyurethane-based composite material.

4. The equipment for customizing the front and back morphological structures of Invar alloy ultrathin strips according to claim 1, characterized in that, The ultrasonic enhancement device is connected to a multi-channel ultrasonic controller, which can independently control the output power, frequency, and operating mode of each channel.

5. The equipment for customizing the front and back morphological structures of Invar alloy ultrathin strips according to claim 1, characterized in that, The integrated tension weighted control system includes a tension sensing network, a servo actuator, and a multivariable control algorithm module; The tension sensing network is used to collect strip tension values ​​in real time. The servo actuator is used to drive the uncoiler and the winding machine; The multivariable control algorithm module is used to perform proportional-integral-derivative compensation based on the tension deviation.

6. The equipment for customizing the front and back morphological structures of Invar alloy ultrathin strips according to claim 1, characterized in that, The diameter of the first intermediate roller is 29 mm, and the taper of the first intermediate roller is 0.001875.

7. The equipment for customizing the front and back morphological structures of Invar alloy ultrathin strips according to claim 1, characterized in that, It also includes a backing roller saddle, the axial movement of the first intermediate roller and the convexity of the backing roller saddle are adjustable, and are used to coordinately adjust the position and intensity of the lateral compressive stress of the work roller.

8. The equipment for customizing the front and back morphological structures of Invar alloy ultrathin strips according to claim 1, characterized in that, The central control unit is configured to synchronously adjust the tension setting value of the integrated tension weighted control system when the ultrasonic bearing device is activated or its parameters are changed, resulting in a change in the friction coefficient.

9. The equipment for customizing the front and back morphological structures of Invar alloy ultrathin strips according to claim 1, characterized in that, It also includes a lubricating oil supply system, which is used to supply lubricating oil at a temperature of 30°C to 40°C to the rolling zone.

10. A rolling method for customizing the front and back morphological structures of Invar alloy ultrathin strips, characterized in that, The equipment described in any one of claims 1 to 9 includes the following steps: Step 1: Configure the surface roughness of the upper and lower work rolls so that the roughness of the upper work roll is higher than that of the lower work roll. Step 2: Establish lateral compressive stress support for the work roll through the first intermediate roll; Step 3: Perform multi-pass rolling, utilizing the differential friction effect between the upper and lower work rolls to drive asymmetric plastic flow and morphology replication on both sides of the strip. Step 4: In each rolling pass, based on real-time plate shape defects, coordinate the adjustment of the roll shifting amount of the first intermediate roll and the convexity of the backing roll saddle. Step 5: Through the cumulative effect of multiple rolling passes, the customized evolution of the surface morphology of the front and back sides of the strip is achieved.

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