A method and system for designing a width-limiting roller system for improving the transverse stress distribution of a cast iron alloy based on a twenty-roller mill

Abstract

The application provides a method and system for improving the width-limiting roller system design of cross-stress distribution of ferroalloy based on a 20-roller mill. The method comprises collecting key parameters before and after the rolling of the ferroalloy ultra-thin strip, automatically calculating the adaptive rolling process based on a preset rolling process database, providing accurate rolling process parameters for each pass, determining the roller diameter and width of the concave width-limiting part of the lower work roller, the roller diameter and width of the convex width-limiting part of the upper work roller and the roller diameter and width of the groove of the upper first intermediate roller through a set of rigorous calculation processes according to the rolling process parameters, determining the adaptive width-limiting roller system geometric parameters and performing strength checking. The system comprises a data acquisition and intelligent process design module, an intelligent width-limiting roller system design module, a width-limiting roller system and an intelligent press-down subsystem. The application solves the processing defects such as strip warping and uneven thickness caused by cross-stress exceeding the standard.

Description

Technical Field

[0001] This invention belongs to the field of ultra-thin strip processing technology, specifically relating to a width-limiting roll system design method and system for improving the transverse stress distribution of Invar alloy based on a 20-roll mill. Background Technology

[0002] Invar alloys, as typical low-expansion metallic materials, have a significantly lower coefficient of thermal expansion than conventional alloys, exhibiting excellent dimensional stability in temperature-changing environments. This characteristic makes them the preferred material for the fabrication of key components in precision testing instruments. With the progress of industrial upgrading, the adaptability of this alloy in structural material applications across multiple fields continues to increase. In the electronics industry, Invar alloys, due to their unique thermomechanical properties, are widely used in the manufacture of functional components, such as fine metal masks for OLED panels, shadow mask fabrication for digital display systems (as a core component of optical imaging), packaging materials for integrated circuits and electron tubes, and low-expansion substrate layers for thermal bimetallic composite materials. Since the beginning of the new century, with the leapfrog development of aerospace technology and precision optical instruments, the strategic value of this material in cutting-edge equipment such as remote sensing satellite payloads, space telescope reflector supports, and laser resonant cavities has become increasingly prominent. Typical applications cover key technology areas such as spaceborne data transmission cables and thermal control modules for laser frequency stabilization devices.

[0003] It is worth noting that Invar ultra-thin strip produced by traditional rolling processes generally suffers from uneven transverse stress distribution, easily leading to defects such as warping, thickness fluctuations, and surface microcracks, severely restricting the finished product qualification rate. Therefore, developing a new rolling equipment system has significant engineering value and economic benefits for improving the processing quality of ultra-thin strip. The constraint of the width-limiting groove of the irregularly shaped roll significantly inhibits the plastic flow of material along the transverse direction of the roll, causing deformation energy to be released mainly along the rolling direction. Its mechanical mechanism is that width-limiting rolling not only has the same normal direction stress as conventional rolling, but also changes the stress state of the plate through the transverse compressive stress applied by the groove wall. This stress field reduces the transverse tensile stress gradient, achieving coordinated control of deformation at the edge and core of the strip, effectively suppressing transverse stress concentration. Compared with the traditional flat roll rolling process, this technology reduces the peak transverse stress of the strip, solving to some extent the processing defects such as strip warping and uneven thickness caused by excessive transverse stress. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a width-limiting roll system design method and system based on a 20-roll mill to improve the transverse stress distribution of Invar alloy. It aims to compensate for the deficiencies of existing equipment and solve processing defects such as strip warping and uneven thickness caused by excessive transverse stress during the rolling of ultra-thin Invar alloy strip.

[0005] To achieve the above objectives, the present invention provides the following solution: A method for designing a width-limited roll system to improve the transverse stress distribution of Invar alloys based on a 20-roll mill, the method comprising: Collect pre- and post-rolling parameters of Invar alloy ultra-thin strip, and obtain rolling process parameters based on the preset rolling process database; Based on the rolling process parameters, the roll diameter and width of the concave width-limiting section of the lower work roll, the roll diameter and width of the convex width-limiting section of the upper work roll, and the roll diameter and width of the groove of the upper first intermediate roll are obtained. The appropriate width-limiting roll system geometric parameters are obtained and the strength is checked. When the strength meets the standard, a qualified width-limiting rolling pressing roll system is obtained.

[0006] Preferably, the width-limiting roller system includes: The upper work roll, lower work roll, upper first intermediate roll, lower first intermediate roll, upper second intermediate roll, lower second intermediate roll, upper support roll, and lower support roll are provided. The upper work roll has a convex part of a fixed width in the middle of its roll surface, and the lower work roll has a concave part of a fixed width in the middle of its roll surface. There are 4 upper and lower first intermediate rolls, and 2 upper first intermediate rolls are provided with width-limiting concave grooves that work in conjunction with the upper work roll.

[0007] Preferably, the method for obtaining the roll diameter and width of the concave width-limiting portion of the lower work roll, the roll diameter and width of the convex width-limiting portion of the upper work roll, and the roll diameter and width of the groove of the upper first intermediate roll according to the rolling process parameters, obtaining the appropriate width-limiting roll system geometric parameters, and performing strength verification, and obtaining a qualified width-limiting rolling pressing roll system when the strength meets the standard includes: Design the overall dimensions of the work roll based on the rolling process parameters; Based on the overall dimensions of the working roll, design the overall dimensions of the intermediate roll and support roll; Based on the overall dimensions of the intermediate roll and support roll, a width limiting mechanism is added: upper working roll, lower working roll, and upper first intermediate roll, to obtain the roll diameter and width of the concave width limiting part of the lower working roll, the roll diameter and width of the convex width limiting part of the upper working roll, and the roll diameter and width of the groove of the upper first intermediate roll. Based on the added width limiting mechanism, a three-dimensional coordinate system of the roller system is established with the center of the roller gap as the origin; Based on the three-dimensional coordinate system of the roll system, the rolling force is calculated to obtain the appropriate geometric parameters of the width-limited roll system. The strength of the rolls is checked, and a qualified width-limited rolling pressing roll system is obtained when the strength meets the standard.

[0008] Preferably, the method for obtaining the diameter and width of the concave width-limiting portion of the lower work roll, the diameter and width of the convex width-limiting portion of the upper work roll, and the diameter and width of the groove of the upper first intermediate roll includes: Based on the initial thickness of the Invar alloy ultrathin strip The drop in height of the grooved portion in the center of the lower work roll surface is limited. Determine the diameter of the concave width-limiting section of the lower working roll. ; Based on the width of the Invar alloy ultra-thin strip and the lateral widening allowance of Invar alloy ultra-thin strip during rolling. Determine the width of the concave width-limiting section of the lower work roll. ; Based on the principle of perfect matching of the upper and lower work roll diameters, that is, the height of the convex part in the middle of the upper work roll surface... Based on the roll diameter of the concave width-limiting portion of the lower work roll Determine the diameter of the convex width-limiting section of the upper working roll. ; Since the widths of the upper and lower work rolls are completely identical, which does not meet the fit principle, a fit tolerance should be reserved. Based on the width of the concave width-limiting portion of the lower work roll Determine the width of the convex width-limiting section of the upper work roll. ; Based on the matching principle between the upper first intermediate roll and the upper working roll, and the principle of preventing the upper first intermediate roll from deflecting and deforming, and based on the drop of the groove portion in the middle of the lower working roll surface... Determine the roller diameter of the first intermediate roller groove. ; The grooved portion of the upper first intermediate roller has a width that is completely identical to the convex width-limiting portion of the upper work roller, which does not conform to the fit principle. Based on the width of the concave width-limiting portion of the lower work roller... Determine the width of the groove in the first intermediate roller. .

[0009] Preferably, the method for calculating the rolling force based on the three-dimensional coordinate system of the roll system, obtaining the appropriate geometric parameters of the width-limiting roll system, and performing strength verification on the upper first intermediate roll, to obtain a qualified width-limiting rolling pressing roll system when the strength meets the standard, includes: Treating the lower work roll as a simply supported beam, obtain the maximum bending moment of the lower work roll. Bending stress of the concave width limiting section of the lower work roll ,like Less than the bending stress of the steel used for the lower work roll Then it is safe: ; ; in, During the rolling process, the concave width-limiting portion of the lower work roll is subjected to a rolling force that is perpendicularly upward. The length of the lower working roll. The lower working roller is subjected to force in the vertical direction. The force is borne by the concave width-limiting section of the lower working roll; Treating the upper work roll as a simply supported beam, obtain the maximum bending moment of the upper work roll. Bending stress of the convex width-limiting section of the upper work roll ,like Less than the bending stress of the steel used for the upper work roll Then it is safe: ; ; in, The upper working roller is subjected to force in the vertical direction. This refers to the force exerted on the convex width-limiting section of the upper working roll.

[0010] Preferably, the method for calculating the rolling force based on the three-dimensional coordinate system of the roll system, obtaining the appropriate geometric parameters of the width-limiting roll system, and performing strength verification on the upper first intermediate roll, to obtain a qualified width-limiting rolling pressing roll system when the strength meets the standard, further includes: The strength of the upper first intermediate roll is checked, and the maximum bending moment of the upper first intermediate roll is obtained. Bending stress of the grooved portion of the first intermediate roller ,like The bending stress of the steel selected for the first intermediate roll is less than that of the steel. Then it is safe: ; ; in, and These represent the maximum bending moments in the x and y directions of the first intermediate roller, respectively.

[0011] Preferably, the method further includes: Data on the transverse stress distribution, pass reduction rate, and thickness distribution of Invar alloy during rolling are obtained. Based on this data, the reduction amount is adjusted in real time to match the crown value of the backing roll, thereby obtaining an ultra-thin strip of rolled Invar alloy.

[0012] The present invention also provides a width-limiting roll system design system for improving the transverse stress distribution of Invar alloy based on a 20-roll mill. The system is used to implement the aforementioned method and includes: a data acquisition and intelligent process design module, a width-limiting roll system intelligent design module, a width-limiting roll system, and an intelligent reduction subsystem. The data acquisition and intelligent process design module is used to collect pre-rolling and post-rolling parameters of Invar alloy ultra-thin strip and obtain rolling process parameters based on the preset rolling process database. The width-limiting roll system intelligent design module is used to obtain the roll diameter and width of the concave width-limiting part of the lower work roll, the roll diameter and width of the convex width-limiting part of the upper work roll, and the roll diameter and width of the groove of the upper first intermediate roll according to the rolling process parameters, obtain the appropriate width-limiting roll system geometric parameters and perform strength verification. When the strength meets the standard, a qualified width-limiting rolling pressing roll system is obtained. The width-limiting roller system includes upper and lower work rollers, upper and lower first intermediate rollers, upper and lower second intermediate rollers, and upper and lower support rollers. The upper work roller has a convex part of fixed width in the middle of its roller surface, and the lower work roller has a concave part of fixed width in the middle of its roller surface. There are 4 upper and lower first intermediate rollers, and 2 of the upper first intermediate rollers are provided with width-limiting concave grooves that work in conjunction with the upper work rollers. The intelligent reduction subsystem includes a communication interface, a communication unit, and a processor. The communication unit is used to acquire relevant data on the transverse stress distribution of Invar alloy, the reduction rate per pass, and the thickness distribution during the rolling process. The processor adjusts the reduction amount in real time based on the relevant data and matches the crown value of the backing roll to ensure the shape quality of the Invar alloy sheet.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides a method and system for designing a width-limiting roll system to improve the transverse stress distribution of Invar alloy based on a 20-roll mill. The system includes a data acquisition and intelligent process design module, a width-limiting roll system intelligent design module, a width-limiting roll system, and an intelligent pressing subsystem. The data acquisition and intelligent process design module collects key parameters of the Invar alloy ultra-thin strip before and after rolling, and automatically calculates suitable rolling processes based on a preset rolling process database, providing precise rolling process parameters for each pass. On this basis, the width-limiting roll system intelligent design module undertakes the core calculation task. Based on the pressing process parameters, it determines the roll diameter and width of the concave width-limiting portion of the lower work roll, the roll diameter and width of the convex width-limiting portion of the upper work roll, and the roll diameter and width of the groove of the upper first intermediate roll through a rigorous calculation process, determining the suitable geometric parameters of the width-limiting roll system and performing strength verification. This invention utilizes the constraint of the width-limiting groove of the irregularly shaped roll to suppress the plastic flow of the material in the transverse direction of the roll, and promotes the release of deformation energy mainly in the rolling direction. The transverse compressive stress applied by the groove wall changes the stress state of the plate, reduces the transverse tensile stress gradient, and realizes the coordinated control of the deformation of the plate edge and the core. It effectively suppresses the transverse stress concentration, reduces the peak transverse stress of the Invar alloy ultra-thin strip, and solves to a certain extent the processing defects such as strip warping and uneven thickness caused by excessive transverse stress. Attached Figure Description

[0014] To more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments are 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.

[0015] Figure 1 This is a schematic diagram of the stress during the width-limited rolling of Invar alloy according to an embodiment of the present invention, wherein (a) is conventional rolling and (b) is width-limited rolling; Figure 2This is a schematic diagram of width-limited rolling according to an embodiment of the present invention, wherein (a) is conventional rolling and (b) is width-limited rolling; Figure 3 This is a flowchart illustrating the design method of the pressure roller system according to an embodiment of the present invention. Figure 4 This is a schematic diagram of the upper and lower working rollers according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the first intermediate roller in an embodiment of the present invention; Figure 6 This is a schematic diagram of the width-limiting roller system according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the contact relationship of the width-limiting roller system according to an embodiment of the present invention, wherein A, B, C, D, E, F, G, and H are backing rollers; I, J, K, L, M, and N are second intermediate rollers, wherein I, K, L, and N are drive rollers, and J and M are idler rollers; O, P, Q, and R are first intermediate rollers; and S and T are work rollers. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] Example 1 This invention provides a method for designing a width-limited roll system based on a 20-roll mill to improve the transverse stress distribution of Invar alloys, comprising: Collect pre- and post-rolling parameters of Invar alloy ultra-thin strip, and obtain rolling process parameters based on the preset rolling process database; Based on the rolling process parameters, the roll diameter and width of the concave width-limiting section of the lower work roll, the roll diameter and width of the convex width-limiting section of the upper work roll, and the roll diameter and width of the groove of the upper first intermediate roll are obtained. The appropriate width-limiting roll system geometric parameters are obtained and the strength is checked. When the strength meets the standard, a qualified width-limiting rolling pressing roll system is obtained.

[0019] The stress during the width-limited rolling of Invar alloy is as follows Figure 1 As shown, the width-limited rolling of Invar alloy is as follows: Figure 2 As shown.

[0020] like Figures 4-7As shown, the width-limiting roller system of the present invention includes: an upper working roller, a lower working roller, an upper first intermediate roller, a lower first intermediate roller, an upper second intermediate roller, a lower second intermediate roller, an upper support roller, and a lower support roller; the upper working roller has a convex portion of fixed width in the middle of its roller surface, and the lower working roller has a concave portion of fixed width in the middle of its roller surface; there are 4 upper first intermediate rollers and 4 lower first intermediate rollers, and 2 upper first intermediate rollers are provided with width-limiting concave grooves that cooperate with the upper working rollers.

[0021] like Figure 3 As shown, the specific implementation process of the present invention is as follows: Collect the pre- and post-rolling parameters of Invar alloy ultra-thin strip, determine the basic rolling process based on the preset rolling process database, and determine the rolling process parameters for each pass.

[0022] Based on the dimensional parameters and rolling process parameters of the Invar alloy ultra-thin strip, the roll diameter and width of the concave width-limiting section of the lower work roll, the roll diameter and width of the convex width-limiting section of the upper work roll, and the roll diameter and width of the groove of the upper first intermediate roll are obtained. The appropriate geometric parameters of the width-limiting roll system are then provided, and a strength check is performed. When the strength meets the standard, a qualified width-limiting rolling pressing roll system is obtained, including: Based on the rolling process parameters, design the overall dimensions of the work roll, mainly the work roll diameter and the work roll length; Based on the overall dimensions of the work rolls, design the overall dimensions of the intermediate rolls (upper first intermediate roll, lower first intermediate roll, upper second intermediate roll, lower second intermediate roll) and the support rolls (upper support roll and lower support roll), mainly the roll diameter and roll length; Based on the overall dimensions of the working roll, intermediate roll, and support roll, a width limiting mechanism is added: upper working roll, lower working roll, and upper first intermediate roll, to obtain the roll diameter and width of the concave width limiting part of the lower working roll, the roll diameter and width of the convex width limiting part of the upper working roll, and the roll diameter and width of the groove of the upper first intermediate roll. Based on the added width limiting mechanism, a three-dimensional coordinate system of the roller system is established with the center of the roller gap as the origin; Based on the three-dimensional coordinate system of the roll system, the rolling force is calculated to obtain the appropriate geometric parameters of the width-limiting roll system. The strength of the rolls (mainly the upper work roll, lower work roll and upper first intermediate roll) is checked. When the strength meets the standard, a qualified width-limiting rolling pressing roll system is obtained.

[0023] The specific calculation steps are as follows: Step 1: Determine the initial thickness of the Invar alloy ultra-thin strip before rolling. Thickness after rolling ,width and width ; Step 2: Based on the initial thickness of the Invar alloy ultrathin strip Limit the drop of the grooved portion in the center of the lower work roll surface (i.e., the concave width-limiting portion of the lower work roll). Determine the diameter of the concave width-limiting section of the lower working roll. .

[0024] (1) (2) in, The working roll diameter is the diameter of the non-width portion of the roll, in mm.

[0025] Step 3: Based on the width of the Invar alloy ultra-thin strip and the lateral widening allowance of Invar alloy ultra-thin strip during rolling. Determine the width of the concave width-limiting section of the lower work roll. and the length of the work roll in the non-width-limited section .

[0026] (3) (4) (5) in, This is the original length of the working roller.

[0027] Step 4: Based on the principle of perfect matching of the upper and lower work roll diameters, that is... Based on the roll diameter of the concave width-limiting portion of the lower work roll Determine the diameter of the convex width-limiting section of the upper working roll. .

[0028] (6) in, The height of the convex portion in the middle of the upper work roll surface.

[0029] Step 5: Since the widths of the upper and lower work rollers are completely identical, which does not meet the fit principle, a fit tolerance needs to be reserved. Based on the width of the concave width-limiting portion of the lower work roll. Determine the width of the convex width-limiting section of the upper work roll. and the length of the work roll on the non-width-limited section .

[0030] (7) (8) in, This is the original length of the working roller.

[0031] Step 6: Based on the matching principle between the upper first intermediate roll and the upper work roll, and the principle of preventing the upper first intermediate roll from deflecting and deforming, and considering the drop of the groove in the middle of the lower work roll surface... Determine the roller diameter of the grooved portion of the first intermediate roller. .

[0032] (9) in, The diameter of the non-grooved portion of the first intermediate roller.

[0033] Step 7: Since the width of the grooved portion of the upper first intermediate roller is exactly the same as the width of the convex width-limiting portion of the upper work roller, which does not meet the fitting principle, the width of the concave width-limiting portion of the lower work roller is used as a basis for determining the fit. Determine the groove width of the first intermediate roller. Length of the first intermediate roller on the non-width-limited section .

[0034] (10) (11) in, This is the original length of the first intermediate roller.

[0035] Step 8: During the rolling process, the concave width-limiting section of the lower work roll is subjected to a rolling force that is perpendicularly upward. This is considered a uniformly distributed load. Therefore, the force on the concave width-limiting portion of the lower work roll is... for: (12) Step 9: The force between the lower work roll and the two lower first intermediate rolls during the rolling process is... The angle between the direction of the force and the horizontal direction is This is considered a uniformly distributed load. The length of the lower working roll is... The force it experiences in the vertical direction is The force in the horizontal direction is .

[0036] (13) (14) Step 10: Consider the lower work roll as a simply supported beam, its maximum (midpoint) bending moment is... The bending stress of the concave width-limiting section of the lower work roll is... This value is less than the bending stress of the steel used for the lower work roll. Then it is safe.

[0037] (15) (16) Step 11: During the rolling process, the convex width-limiting portion of the upper work roll is subjected to a rolling force that is perpendicularly downward. If we consider it as a uniformly distributed load, then the force on the convex width-limiting section of the upper working roll is... for: (17) Step 12: The force between the upper work roll and the two upper first intermediate rolls during the rolling process is... The angle between the direction of the force and the horizontal direction This is considered a uniformly distributed load. (Length of the upper working roll) The force in the vertical direction is The force in the horizontal direction is .

[0038] (18) (19) Step 13: Consider the upper work roll as a simply supported beam, its maximum (midpoint) bending moment is The bending stress of the convex width-limiting section of the upper work roll is If this value is less than the bending stress of the steel used for the upper work roll... Then it is safe.

[0039] (20) (twenty one) Step 14: The force between the upper first intermediate roll and the upper work roll during the rolling process is... The angle between the direction of the force and the horizontal direction If we consider it as a uniformly distributed load, then the length of the first intermediate roller is... The force in the vertical direction is The force in the horizontal direction is .

[0040] (twenty two) (twenty three) Step 15: The force between the non-width-limited sections of the two upper first intermediate rolls during the rolling process is... The angle between the direction of the force and the horizontal direction If we consider it as a uniformly distributed load, then the vertical force on the first intermediate roller in the non-width-limited section is: The force in the horizontal direction is .

[0041] (twenty four) (25) in, The length of the unrestricted width portion of the first intermediate roller.

[0042] Step 16: The force between the non-width-limited portion of the upper first intermediate roll and the upper second intermediate roll during the rolling process is... The angle between the direction of the force and the horizontal direction If we consider it as a local load, then the vertical force on the first intermediate roller in the non-width-limited section is: The force in the horizontal direction is .

[0043] (26) (27) Step 17: Perform a strength check on the first intermediate roller. Its maximum (midpoint) bending moment is: The bending stress of the grooved portion of the first intermediate roller is... If this value is less than the bending stress of the steel selected for the first intermediate roll... Then it is safe.

[0044] (28) (29) in, and These represent the maximum bending moments in the x and y directions of the first intermediate roller, respectively.

[0045] Furthermore, the width-limited roll system design method for improving the transverse stress distribution of Invar alloy based on a 20-roll mill provided by this invention also includes: Data on the transverse stress distribution, pass reduction rate, and thickness distribution of Invar alloy during rolling are obtained. Based on this data, the reduction amount is adjusted in real time (the reduction amount is generated by the reduction rack at the edge of the backing roll) and matched with the crown value of the backing roll to obtain the rolled Invar alloy ultra-thin strip.

[0046] In summary, this invention provides a width-limiting roll system design method for improving the transverse stress distribution of Invar alloy based on a 20-roll mill. It collects key parameters of the Invar alloy ultra-thin strip before and after rolling, and automatically calculates suitable rolling processes based on a pre-set rolling process database, providing precise rolling process parameters for each pass. Based on the rolling process parameters, a rigorous calculation process determines the roll diameter and width of the concave width-limiting portion of the lower work roll, the roll diameter and width of the convex width-limiting portion of the upper work roll, and the roll diameter and width of the groove of the upper first intermediate roll, thus determining the suitable geometric parameters of the width-limiting roll system and performing strength verification. This invention utilizes the constraint of the width-limiting groove of the irregularly shaped roll to suppress the plastic flow of the material in the transverse direction of the roll, and promotes the release of deformation energy mainly in the rolling direction. The transverse compressive stress applied by the groove wall changes the stress state of the plate, reduces the transverse tensile stress gradient, and realizes the coordinated control of the deformation of the plate edge and the core. It effectively suppresses the transverse stress concentration, reduces the peak transverse stress of the Invar alloy ultra-thin strip, and solves to a certain extent the processing defects such as strip warping and uneven thickness caused by excessive transverse stress.

[0047] Example 2 Based on the same inventive concept, the present invention also provides a width-limiting roll system design system for improving the transverse stress distribution of Invar alloy based on a 20-roll mill, used to implement the method described in the foregoing embodiments. The system includes: a data acquisition and intelligent process design module, a width-limiting roll system intelligent design module, a width-limiting roll system, and an intelligent pressing subsystem. The data acquisition and intelligent process design module is used to collect pre-rolling and post-rolling parameters of Invar alloy ultra-thin strip and obtain rolling process parameters based on the preset rolling process database. The width-limiting roll system intelligent design module is used to obtain the roll diameter and width of the concave width-limiting part of the lower work roll, the roll diameter and width of the convex width-limiting part of the upper work roll, and the roll diameter and width of the groove of the upper first intermediate roll according to the rolling process parameters, obtain the appropriate width-limiting roll system geometric parameters and perform strength verification. When the strength meets the standard, a qualified width-limiting rolling pressing roll system is obtained. The width-limiting roller system includes upper and lower work rollers, upper and lower first intermediate rollers, upper and lower second intermediate rollers, and upper and lower support rollers. The upper work roller has a convex part of fixed width in the middle of its roller surface, and the lower work roller has a concave part of fixed width in the middle of its roller surface. There are 4 upper and lower first intermediate rollers, and 2 of the upper first intermediate rollers are provided with width-limiting concave grooves that work in conjunction with the upper work rollers. The intelligent reduction subsystem includes a communication interface, a communication unit, and a processor. The communication unit is used to acquire relevant data on the transverse stress distribution of Invar alloy, the reduction rate per pass, and the thickness distribution during the rolling process. The processor adjusts the reduction amount in real time based on the relevant data and matches the crown value of the backing roll to ensure the shape quality of the Invar alloy sheet.

[0048] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for designing a width-limited roll system to improve the transverse stress distribution of Invar alloys based on a 20-roll mill, characterized in that, The method includes: Collect pre- and post-rolling parameters of Invar alloy ultra-thin strip, and obtain rolling process parameters based on the preset rolling process database; Based on the rolling process parameters, the roll diameter and width of the concave width-limiting section of the lower work roll, the roll diameter and width of the convex width-limiting section of the upper work roll, and the roll diameter and width of the groove of the upper first intermediate roll are obtained. The appropriate width-limiting roll system geometric parameters are obtained and the strength is checked. When the strength meets the standard, a qualified width-limiting rolling pressing roll system is obtained.

2. The method according to claim 1, characterized in that, Width-limiting roller system includes: The upper work roll, lower work roll, upper first intermediate roll, lower first intermediate roll, upper second intermediate roll, lower second intermediate roll, upper support roll, and lower support roll are provided. The upper work roll has a convex part of a fixed width in the middle of its roll surface, and the lower work roll has a concave part of a fixed width in the middle of its roll surface. There are 4 upper and lower first intermediate rolls, and 2 upper first intermediate rolls are provided with width-limiting concave grooves that work in conjunction with the upper work roll.

3. The method according to claim 1, characterized in that, Based on the rolling process parameters, the roll diameter and width of the concave width-limiting portion of the lower work roll, the roll diameter and width of the convex width-limiting portion of the upper work roll, and the roll diameter and width of the groove of the upper first intermediate roll are obtained. The appropriate geometric parameters of the width-limiting roll system are then obtained, and a strength check is performed. A qualified width-limiting rolling pressing roll system is obtained when the strength meets the standard. The method includes: Design the overall dimensions of the work roll based on the rolling process parameters; Based on the overall dimensions of the working roll, design the overall dimensions of the intermediate roll and support roll; Based on the overall dimensions of the intermediate roll and support roll, a width limiting mechanism is added: upper working roll, lower working roll, and upper first intermediate roll, to obtain the roll diameter and width of the concave width limiting part of the lower working roll, the roll diameter and width of the convex width limiting part of the upper working roll, and the roll diameter and width of the groove of the upper first intermediate roll. Based on the added width limiting mechanism, a three-dimensional coordinate system of the roller system is established with the center of the roller gap as the origin; Based on the three-dimensional coordinate system of the roll system, the rolling force is calculated to obtain the appropriate geometric parameters of the width-limited roll system. The strength of the rolls is checked, and a qualified width-limited rolling pressing roll system is obtained when the strength meets the standard.

4. The method according to claim 3, characterized in that, The methods for obtaining the diameter and width of the concave width-limiting portion of the lower work roll, the diameter and width of the convex width-limiting portion of the upper work roll, and the diameter and width of the groove of the upper first intermediate roll include: Based on the initial thickness of the Invar alloy ultrathin strip The drop in height of the grooved portion in the center of the lower work roll surface is limited. Determine the diameter of the concave width-limiting section of the lower working roll. ; Based on the width of the Invar alloy ultra-thin strip and the lateral widening allowance of Invar alloy ultra-thin strip during rolling. Determine the width of the concave width-limiting section of the lower work roll. ; Based on the principle of perfect matching of the upper and lower work roll diameters, that is, the height of the convex part in the middle of the upper work roll surface... Based on the roll diameter of the concave width-limiting portion of the lower work roll Determine the diameter of the convex width-limiting section of the upper working roll. ; Since the widths of the upper and lower work rolls are completely identical, which does not meet the fit principle, a fit tolerance should be reserved. Based on the width of the concave width-limiting portion of the lower work roll Determine the width of the convex width-limiting section of the upper work roll. ; Based on the matching principle between the upper first intermediate roll and the upper working roll, and the principle of preventing the upper first intermediate roll from deflecting and deforming, and based on the drop of the groove portion in the middle of the lower working roll surface... Determine the roller diameter of the first intermediate roller groove. ; The grooved portion of the upper first intermediate roller has a width that is completely identical to the convex width-limiting portion of the upper work roller, which does not conform to the fit principle. Based on the width of the concave width-limiting portion of the lower work roller... Determine the width of the groove in the first intermediate roller. .

5. The method according to claim 4, characterized in that, Based on the three-dimensional coordinate system of the roll system, the rolling force is calculated to obtain the appropriate geometric parameters of the width-limiting roll system. The strength of the upper first intermediate roll is checked, and a qualified width-limiting rolling pressing roll system is obtained when the strength meets the standard. The method includes: Treating the lower work roll as a simply supported beam, obtain the maximum bending moment of the lower work roll. Bending stress of the concave width limiting section of the lower work roll ,like Less than the bending stress of the steel used for the lower work roll Then it is safe: ； ； in, During the rolling process, the concave width-limiting portion of the lower work roll is subjected to a rolling force that is perpendicularly upward. The length of the lower working roll. The lower working roller is subjected to force in the vertical direction. The force is borne by the concave width-limiting section of the lower working roll; Treating the upper work roll as a simply supported beam, obtain the maximum bending moment of the upper work roll. Bending stress of the convex width-limiting section of the upper work roll ,like Less than the bending stress of the steel used for the upper work roll Then it is safe: ； ； in, The upper working roller is subjected to force in the vertical direction. This refers to the force exerted on the convex width-limiting section of the upper working roll.

6. The method according to claim 5, characterized in that, The method for calculating rolling force based on the three-dimensional coordinate system of the roll system, obtaining the appropriate geometric parameters of the width-limiting roll system, and performing strength verification on the upper first intermediate roll, to obtain a qualified width-limiting rolling pressing roll system when the strength meets the standard, also includes: The strength of the upper first intermediate roll is checked, and the maximum bending moment of the upper first intermediate roll is obtained. Bending stress of the grooved portion of the first intermediate roller ,like The bending stress of the steel selected for the first intermediate roll is less than that of the steel. Then it is safe: ； ； in, and These represent the maximum bending moments in the x and y directions of the first intermediate roller, respectively.

7. The method according to claim 1, characterized in that, The method further includes: Data on the transverse stress distribution, pass reduction rate, and thickness distribution of Invar alloy during rolling are obtained. Based on this data, the reduction amount is adjusted in real time to match the crown value of the backing roll, thereby obtaining an ultra-thin strip of rolled Invar alloy.

8. A width-limiting roll system design system for improving the transverse stress distribution of Invar alloys based on a 20-roll mill, said system being used to implement the method described in any one of claims 1-7, characterized in that, The system includes: a data acquisition and intelligent process design module, an intelligent design module for width-limiting roll system, a width-limiting roll system, and an intelligent pressing subsystem; The data acquisition and intelligent process design module is used to collect pre-rolling and post-rolling parameters of Invar alloy ultra-thin strip and obtain rolling process parameters based on the preset rolling process database. The width-limiting roll system intelligent design module is used to obtain the roll diameter and width of the concave width-limiting part of the lower work roll, the roll diameter and width of the convex width-limiting part of the upper work roll, and the roll diameter and width of the groove of the upper first intermediate roll according to the rolling process parameters, obtain the appropriate width-limiting roll system geometric parameters and perform strength verification. When the strength meets the standard, a qualified width-limiting rolling pressing roll system is obtained. The width-limiting roller system includes upper and lower work rollers, upper and lower first intermediate rollers, upper and lower second intermediate rollers, and upper and lower support rollers. The upper work roller has a convex part of fixed width in the middle of its roller surface, and the lower work roller has a concave part of fixed width in the middle of its roller surface. There are 4 upper and lower first intermediate rollers, and 2 of the upper first intermediate rollers are provided with width-limiting concave grooves that work in conjunction with the upper work rollers. The intelligent reduction subsystem includes a communication interface, a communication unit, and a processor. The communication unit is used to acquire relevant data on the transverse stress distribution of Invar alloy, the reduction rate per pass, and the thickness distribution during the rolling process. The processor adjusts the reduction amount in real time based on the relevant data and matches the crown value of the backing roll to ensure the shape quality of the Invar alloy sheet.

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