Method for controlling rolling force of temper mill and related equipment

Abstract

The invention provides a control method for the rolling force of a temper mill and related equipment, and relates to the technical field of metallurgical production, the method comprises the steps that pattern information of strip steel is obtained, and the pattern information comprises width information and thickness information; determining the height of an inlet and the height of an outlet of the anti-wrinkling roller based on the model information; determining the diameter of a working roll based on the model information; determining inlet tension and outlet tension according to the diameter of the working roll; and controlling the rolling process of the temper mill based on the height of the inlet of the anti-wrinkling roller, the height of the outlet of the anti-wrinkling roller, the inlet tension and the outlet tension.

Description

Technical Field

[0001] The present application relates to the field of metallurgical production technology, and in particular to a method for controlling the rolling force of a leveling mill and related equipment. Background Art

[0002] In the metallurgical production process, the flattening of strip steel is an important process step, which aims to improve the flatness and thickness accuracy of the strip steel surface. In the traditional flattening mill operation, due to the uneven distribution of rolling force and tension, the strip steel may have defects such as thick center and thin edge when passing through the flattening mill, which affects the quality of the final product. In addition, the working roll is prone to bending deformation during the rolling process, which further affects the flattening effect of the strip steel.

[0003] In order to overcome these problems, the existing technology is unable to reduce the rolling force when producing extreme specifications. At that time, the speed has been adjusted to the lowest process speed, and the rolling force of the equipment has also reached the limit, but it still cannot meet the requirements of normal plate shape, thus causing many defects; the maximum rolling force production time of the on-site equipment is too long, which will cause the leveling machine to stop quickly and cause the roller gap to open automatically, thus causing abnormal production, resulting in poor leveling effect and difficulty in ensuring the surface quality of the product.

[0004] In order to at least solve some of the above problems, it is urgently necessary to provide a method for controlling the rolling force of a flat mill. Summary of the invention

[0005] A series of simplified concepts are introduced in the Summary of the Invention section, which will be further described in detail in the Detailed Description of the Invention section. The Summary of the Invention section of this application does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0006] In a first aspect, the present application provides a method for controlling a rolling force of a skin-pass mill, comprising:

[0007] Obtaining the pattern information of the strip steel, wherein the pattern information includes width information and thickness information;

[0008] Determine the entrance height and exit height of the anti-wrinkle roller based on the above-mentioned version information;

[0009] Determine the working roll diameter based on the above-mentioned version information;

[0010] Determine the inlet tension and outlet tension according to the above working roll diameter;

[0011] Based on the anti-wrinkle roller entrance height, the anti-wrinkle roller exit height, the entrance tension and the exit tension, the rolling process of the skin-pass mill is controlled.

[0012] In one possible implementation,

[0013] The inlet height of the anti-wrinkle roller is greater than 130% of the first preset height value; and / or,

[0014] The exit height of the anti-wrinkle roller is greater than 130% of the second preset height value; and / or,

[0015] The inlet height of the anti-wrinkle roller is greater than the outlet height of the anti-wrinkle roller.

[0016] In one possible implementation,

[0017] The above outlet tension is greater than the above outlet tension; and / or,

[0018] The inlet tension is greater than 130%-150% of the first tension preset value; and / or,

[0019] The above outlet tension is greater than 130%-150% of the second tension preset value; and / or,

[0020] The tension difference between the above outlet tension and the above inlet tension is greater than 5KN.

[0021] In a feasible implementation, it also includes:

[0022] A leveling liquid is sprayed between the steel strip and the working roll, wherein the pressure of the leveling liquid is greater than or equal to 1.0 bar, and the concentration of the leveling liquid is 3% to 5%.

[0023] In a feasible implementation, it also includes:

[0024] When the straightness of the strip is less than the preset straightness, the bending roll force of the intermediate roll is adjusted to assist the working rolls in adjusting the straightness of the strip.

[0025] In a feasible implementation manner, the working rolls and the intermediate rolls are non-chrome-plated rolls; and the processing technology level of the working rolls and the intermediate rolls is non-super-finished.

[0026] In a feasible implementation manner, the working roll is a convex roll; and the intermediate roll is a shifting roll.

[0027] In a second aspect, the present application provides a control device for a rolling force of a skin-pass mill, comprising:

[0028] The strip steel acquisition unit is used to acquire the pattern information of the strip steel, wherein the pattern information includes width information and thickness information;

[0029] A height determination unit, used to determine the entrance height of the anti-wrinkle roller and the exit height of the anti-wrinkle roller based on the above-mentioned version information;

[0030] A diameter determination unit, used for determining the diameter of the working roll based on the above-mentioned version information;

[0031] A tension determination unit, used for determining the inlet tension and the outlet tension according to the working roll diameter;

[0032] A control rolling unit is used to control the rolling process of the leveling mill based on the anti-wrinkle roller entrance height, the anti-wrinkle roller exit height, the entrance tension and the exit tension.

[0033] In the third aspect, an electronic device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor is used to implement the steps of a method for controlling the rolling force of a flat mill as described in any one of the first aspects above when executing the computer program stored in the memory.

[0034] In a fourth aspect, the present application further proposes a computer-readable storage medium having a computer program stored thereon, characterized in that when the computer program is executed by a processor, a method for controlling the rolling force of a flat mill as described in any one of the first aspects above is implemented.

[0035] In summary, the embodiment of the present invention provides an optimization control method for the rolling force of the leveling mill. By accurately determining the entrance and exit heights of the anti-wrinkle roller and the diameter of the working roller based on the width, thickness and other version information of the strip, the distribution of tension and roller force during the rolling process is more uniform, and the local deformation problem caused by uneven tension is reduced. By accurately controlling the entrance and exit tensions, the tension stability of the strip during the entire leveling process can be ensured, and the uneven thickness of the strip caused by tension fluctuations can be reduced. The adaptability of the leveling process is enhanced. Whether it is thin strip or thick strip, stable leveling operation can be achieved through this method, thereby improving product consistency. By applying bending roll force to the working roll and the intermediate roll, the elastic bending deformation generated during the rolling process is accurately compensated, thereby preventing the strip from having the undesirable phenomenon of "thick in the center and thin at the edge" or "thick at the edge and thin in the center". Through precise bending roll force adjustment, the flatness of the strip is significantly improved, and the thickness distribution is more uniform, which is particularly suitable for the demand for high-precision products. Combined with the auxiliary adjustment function of the intermediate roll bending force, the pressure distribution in the width direction can be further optimized to ensure the uniformity of the thickness of the strip in the width direction and improve the overall quality of the product. Through the precise control of the pressure and concentration parameters of the leveling liquid, the friction between the strip and the working roll is effectively reduced, and the surface scratches and overheating caused by excessive friction are avoided. At the same time, the cooling function of the leveling liquid can effectively prevent the local deformation of the strip surface due to excessive temperature, so that the surface quality of the strip is greatly improved. Through the precise control of the rolling force and the leveling liquid, the energy waste of the leveling machine is reduced. For example, reasonable leveling liquid injection can not only improve the lubrication and cooling effect of the strip surface, but also avoid excessive use of cooling medium, reduce energy consumption and operating costs. A stable rolling process can not only improve product quality, but also reduce the frequency of machine maintenance, extend the service life of equipment, and thus reduce overall production costs.

[0036] The method for controlling the rolling force of a leveler proposed in the present invention, and other advantages, objectives and features of the present invention will be partially reflected through the following description, and will also be partially understood by technicians in this field through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present specification. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0038] Figure 1 A schematic flow chart of a method for controlling the rolling force of a skin-pass mill provided in an embodiment of the present application;

[0039] Figure 2A schematic diagram of the structure of a rolling force control device for a skin-pass mill provided in an embodiment of the present application;

[0040] Figure 3 A schematic diagram of the structure of an electronic device for controlling the rolling force of a flat-pass mill provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices. The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0042] See also Figure 1 , which is a flow chart of a method for controlling the rolling force of a skin-pass mill provided in an embodiment of the present application, which may specifically include:

[0043] S110, obtaining the pattern information of the strip steel, wherein the pattern information includes width information and thickness information;

[0044] For example, the strip pattern information is the basic data of the entire flattening process, which determines the subsequent process parameter settings. The pattern information mainly includes the width and thickness of the strip, which have a direct impact on the pressure distribution, tension control and final flattening effect during the rolling process. The width information determines the lateral size of the strip, while the thickness determines the deformability of the material during the rolling process. The greater the thickness, the higher the pressure required; the greater the width, the more likely the strip will have uneven edge thickness during the flattening process. By obtaining this data, it can ensure that the subsequent parameter adjustment is more accurate and avoid product quality problems caused by parameter mismatch.

[0045] The skin-pass mill usually uses precision sensors or laser measuring devices to automatically obtain the size information of the strip. This information is transmitted to the control system through a real-time feedback system to ensure that each roll of strip can be personalized according to its version information.

[0046] S120, determining the entrance height and exit height of the anti-wrinkle roller based on the above-mentioned version information;

[0047] For example, the main function of the anti-wrinkle roller is to prevent the strip from wrinkling due to uneven tension or improper operation when entering the flattening machine. Once wrinkles are formed, they will affect the subsequent flattening effect and cause the product to be unqualified. The height of the anti-wrinkle roller needs to be precisely adjusted according to the width and thickness of the strip.

[0048] The entrance height of the anti-wrinkle roller needs to ensure that the strip can enter the rolling mill smoothly and steadily. If the entrance height is set too high or too low, the strip will be unevenly stressed, resulting in wrinkles. The exit height of the anti-wrinkle roller affects the state of the strip when it comes out of the rolling mill. Reasonable setting of the exit height helps to maintain the flatness of the strip and avoid surface defects caused by sudden changes in tension. The height of the anti-wrinkle roller can be controlled by a hydraulic system or an automatic adjustment device. By calculating the width, thickness and material properties of the strip (such as yield strength, elastic modulus, etc.), the system calculates the optimal anti-wrinkle roller height to ensure smooth passage of the strip.

[0049] S130, determining the diameter of the working roll based on the above-mentioned version information;

[0050] For example, the working roll is the roll in the flattening mill that contacts the strip, and its diameter determines the compressive stress on the strip during the flattening process. The width and thickness of the strip determine the required working roll diameter. If the working roll diameter is too large or too small, it will have a negative impact on the flatness of the strip. The working roll deforms the strip by applying pressure to achieve the flattening effect. When the strip passes through the working roll, the larger the contact area, the more uniform the pressure, and the better the rolling effect. However, if the strip is too wide or too thick, a larger working roll diameter is required to ensure that the pressure is evenly distributed on the surface of the strip to avoid the phenomenon of thick center and thin edges.

[0051] S140, determining the inlet tension and the outlet tension according to the working roll diameter;

[0052] For example, tension is an important control parameter in the rolling process of the strip, which directly affects the stability of the strip in the skin-pass mill and the rolling effect. The inlet tension and outlet tension need to be adjusted accordingly according to the diameter of the working roll to ensure that the strip has uniform tension throughout the rolling process and avoid strip deformation or surface defects caused by uneven tension.

[0053] The entrance tension is used to ensure that the strip enters the skin-pass mill smoothly and maintains sufficient tightness to prevent the strip from loosening or wrinkling. The entrance tension usually needs to match the diameter of the work roll and the thickness of the strip. Thicker strips usually require higher entrance tension to ensure that they do not wrinkle when entering the mill. The exit tension is used to control the flatness of the strip after it leaves the skin-pass mill. If the exit tension is too low, the strip may loosen and affect the flatness; if the exit tension is too high, the strip may be overly deformed or stretched, and may even break. The exit tension also needs to be set according to the diameter of the work roll and the strip pattern information.

[0054] The tension is usually adjusted through a servo control system or a hydraulic system. The system will adjust the tension parameters in real time according to the running status of the strip and the diameter of the working roll to ensure the balance of inlet and outlet tension.

[0055] S150. Based on the anti-wrinkle roller entrance height, the anti-wrinkle roller exit height, the entrance tension and the exit tension, the rolling process of the leveling mill is controlled.

[0056] For example, the height and tension control of the anti-wrinkle roller optimizes the rolling process of the entire skin-pass mill. It ensures that the strip maintains stable tension and flatness during the rolling process, avoiding surface defects caused by tension fluctuations or improper roller pressure settings. The entrance height and exit height of the anti-wrinkle roller interact with the entrance tension and exit tension, which together determine the stress and strain distribution of the strip in the skin-pass mill. Through precise linkage control, the skin-pass mill can adapt to strips of different widths and thicknesses, thereby ensuring product quality.

[0057] The skin-pass mill is usually equipped with an automated control system that monitors the strip status in real time through sensors and adjusts various parameters through feedback. For example, when wrinkles or tension fluctuations are detected on the strip surface, the system will automatically adjust the height of the anti-wrinkle roller or reset the tension to ensure the flatness of the strip and product quality.

[0058] In summary, the embodiment of the present invention provides an optimization control method for the rolling force of the leveling mill. By accurately determining the entrance and exit heights of the anti-wrinkle roller and the diameter of the working roller based on the width, thickness and other version information of the strip, the distribution of tension and roller force during the rolling process is more uniform, and the local deformation problem caused by uneven tension is reduced. By accurately controlling the entrance and exit tensions, the tension stability of the strip during the entire leveling process can be ensured, and the uneven thickness of the strip caused by tension fluctuations can be reduced. The adaptability of the leveling process is enhanced. Whether it is thin strip or thick strip, stable leveling operation can be achieved through this method, thereby improving product consistency. By applying bending roll force to the working roll and the intermediate roll, the elastic bending deformation generated during the rolling process is accurately compensated, thereby preventing the strip from having the undesirable phenomenon of "thick in the center and thin at the edge" or "thick at the edge and thin in the center". Through precise bending roll force adjustment, the flatness of the strip is significantly improved, and the thickness distribution is more uniform, which is particularly suitable for the demand for high-precision products. Combined with the auxiliary adjustment function of the intermediate roll bending force, the pressure distribution in the width direction can be further optimized to ensure the thickness uniformity of the strip in the width direction and improve the overall quality of the product.

[0059] This application is described in detail with high-strength cold-rolled automobile steel plate JSC590R:

[0060] For example, during the operation of the leveling machine, the strip first passes through the entrance of the anti-wrinkle roller. At this time, the entrance height of the anti-wrinkle roller needs to be appropriately adjusted to ensure that the strip does not generate wrinkles when entering the leveling machine. Then, the strip is subjected to a certain entrance tension and enters the working area of ​​the leveling machine. In this area, the strip is leveled by a pair of working rollers. The diameter of the working roller (i.e., the roller diameter) determines the contact area and pressure distribution between it and the strip. In order to adjust the flatness and straightness of the strip, the working roller will apply a certain bending roll force, and sometimes the intermediate roller and its corresponding bending roll force are used to assist in adjusting the flatness of the strip.

[0061] During the leveling process, the use of leveling fluid is also crucial. The leveling fluid not only acts as a lubricant to reduce the friction between the strip and the working rolls, but also acts as a coolant to prevent the strip from overheating. The concentration, density and injection pressure of the leveling fluid all need to be precisely controlled to ensure that it works effectively. The concentration of the leveling fluid directly affects its lubrication effect, the density affects its adhesion to the strip surface, and the injection pressure ensures that the leveling fluid can evenly cover the strip surface.

[0062] After the strip comes out from between the working rolls, it needs to be output smoothly through a certain withdrawal speed. At the same time, in order to maintain the tension balance of the strip, the exit tension also needs to be accurately controlled. Finally, the strip passes through the exit of the anti-wrinkle roller. At this time, the exit height of the anti-wrinkle roller also needs to be properly set to prevent wrinkles or other surface defects on the strip when it leaves the skin-pass mill.

[0063] The data of high-strength cold-rolled automobile steel plate JSC590R are shown in Table 1, and serial numbers 1-7 are all steel plates of model JSC590R.

[0064] Table 1 JSC590R steel plate data sheet

[0065]

[0066] In some examples, the anti-wrinkle roller entrance height is greater than 130% of the first height preset value; and / or, the anti-wrinkle roller exit height is greater than 130% of the second height preset value; and / or, the anti-wrinkle roller entrance height is greater than the anti-wrinkle roller exit height.

[0067] For example, the inlet and outlet height adjustment of the anti-wrinkle roller is to avoid wrinkles in the strip during the flattening process. By accurately controlling the height of the anti-wrinkle roller, it is possible to ensure that the strip always maintains uniform tension and flatness when entering and leaving the flattening machine, thereby achieving good surface quality.

[0068] The entrance height is greater than 130% of the first height preset value, indicating that the entrance height of the anti-wrinkle roller needs to be greater than 130% of the entrance height system preset value. In the embodiment of the present application, the first height preset value is the entrance height system preset value to ensure that the strip can maintain a certain height space when entering the leveling machine. This helps to avoid surface wrinkles caused by excessive tension of the strip or too low roller height setting.

[0069] When the strip enters the leveler, if the entrance height is too low, it will exert pressure on the surface of the strip and easily form wrinkles. By setting the entrance height to be 130% greater than the preset value, enough space can be left for the strip so that it will not be over-extruded while maintaining tension. In addition, a larger entrance height can provide a buffer zone for the strip before it enters the leveler, allowing the strip to gradually adapt to the subsequent leveling process and reduce surface defects caused by sudden tension changes.

[0070] The exit height is greater than 130% of the second height preset value, indicating that the exit height of the anti-wrinkle roller is greater than 130% of the exit height system preset value. In the embodiment of the present application, the second height preset value is the exit height system preset value, which is to ensure that the strip can smoothly leave the leveling machine after being rolled by the working roller and maintain a smooth surface, avoiding surface ripples or tension fluctuations at the exit.

[0071] The setting of the exit height directly affects the state of the strip when it leaves the equipment after rolling. If the exit height is too low, the strip will be subjected to excessive pressure when leaving the skin-pass mill, resulting in deformation or surface wrinkles. By setting the exit height to more than 130% of the preset value, sufficient buffer space can be provided for the strip to smoothly transition to the next stage of processing. Applicable to strip processing on a production line passing through multiple rolling mill units, a higher exit height helps to ensure that the strip can maintain stable tension after leaving the first skin-pass process and avoid surface fluctuations caused by height differences.

[0072] The entrance height is greater than the exit height, indicating that the entrance height of the anti-wrinkle roller should be greater than the exit height to ensure that the tension of the strip gradually increases during the entire flattening process. This is to avoid relaxation or deformation of the strip during rolling and to ensure the flattening effect.

[0073] During the leveling process, the tension on the strip changes constantly. If the entry height is lower than the exit height, the strip may lose tension after entering the leveler, resulting in sag or wrinkling. By ensuring that the entry height is greater than the exit height, a gradually increasing tension gradient can be provided to the strip, helping the strip to remain taut during the rolling process and ensuring the rolling effect. Gradually increasing the pressure on the strip through different roll groups ensures that the strip can be evenly distributed in each link, especially in the multi-pass rolling process. The differential control of the entry and exit heights can effectively avoid excessive deformation or surface quality problems of the strip.

[0074] Exemplarily, according to the contents in Table 1, taking the high-strength cold-rolled automobile steel plate whose finished product grade is JSC590R, serial number is 1, finished product thickness is 1mm, and finished product width is 1349mm as an example, the entrance height can be set to 111mm, the exit height can be set to 92mm, the entrance height preset value can be set to 80mm, and the exit height preset value can be set to 60mm. Through the above settings, the method can effectively control the rolling force of the equipment in the leveling mill, ensure that the elongation is within a reasonable range, improve the flatness and straightness of the strip, thereby effectively ensuring the quality of the strip and controlling the version.

[0075] In some examples,

[0076] The outlet tension is greater than the outlet tension; and / or, the inlet tension is greater than 130%-150% of the first tension preset value; and / or, the outlet tension is greater than 130%-150% of the second tension preset value; and / or, the tension difference between the outlet tension and the inlet tension is greater than 5KN.

[0077] For example, the exit tension is greater than the above exit tension. During the rolling process, if the exit tension is lower than the entrance tension, the strip may lose the required tensile force when leaving the rolling mill, resulting in surface rebound or ripples. This will affect the flatness of the strip and even cause the product to be unqualified. Setting a slightly higher exit tension can ensure that the strip remains in a uniform tensile state when leaving the rolling equipment, reduce tension fluctuations, and thus improve the surface quality and thickness uniformity of the product.

[0078] The entrance tension is greater than 130%-150% of the first tension preset value. In order to ensure that sufficient tension has been established before the strip enters the leveling machine, thereby preventing the strip from wrinkling or surface defects during the leveling process due to insufficient tension, in the embodiment of the present application, the first tension preset value is the entrance tension system preset value. The entrance tension is required to ensure that the strip is in a stable stretching state before entering the leveling machine. Too low tension will cause the strip to relax, resulting in wrinkling during the rolling process, while too high tension may cause the strip to stretch excessively, causing breakage or other quality problems. Setting the entrance tension to 130%-150% of the preset value can provide a stable basic tension for the strip, so that it remains stable when entering the leveling machine. The tension within this range can avoid surface defects caused by insufficient tension, and will not cause damage or breakage of the strip due to excessive tension.

[0079] The outlet tension is greater than 130%-150% of the second tension preset value. In order to maintain the surface flatness of the strip when it leaves the leveler and avoid surface quality problems caused by insufficient tension, in the embodiment of the present application, the second tension preset value is the outlet tension system preset value. The outlet tension directly affects the state of the strip after it leaves the rolling equipment. If the outlet tension is too low, the strip may relax after leaving the equipment, resulting in surface ripples or uneven thickness; if the tension is too high, it may cause excessive stretching of the strip or material deformation. Setting the outlet tension to 130%-150% of the preset value can effectively control the stretching degree of the strip, so that it maintains an ideal stretching state when it leaves the leveler, thereby ensuring a smooth product surface and uniform thickness. This tension range can adapt to strips of different thicknesses and widths to ensure the stability of product quality.

[0080] The tension difference between the outlet tension and the inlet tension is greater than 5KN. In order to ensure that the tension gradient of the strip is sufficiently gentle during the rolling process, it can not only avoid quality problems caused by sudden changes in tension, but also maintain the appropriate stretching state of the strip. During the rolling process, the inlet tension and outlet tension of the strip are usually not exactly the same. In order to prevent problems such as wrinkling or breaking of the strip during the rolling process, the outlet tension is usually slightly higher than the inlet tension to form a reasonable tension gradient. If the difference between the inlet and outlet tensions is too small, the strip may wrinkle during the rolling process due to insufficient tension; if the difference is too large, it may cause the strip to be overstretched and even cause the risk of breaking. Therefore, maintaining a tension difference of more than 5KN can ensure that the strip is subjected to a stable tensile force distribution during the rolling process and avoid quality problems caused by tension fluctuations. The tension difference of 5KN is based on the material characteristics of the strip and the rolling process experience. This value is sufficient to ensure that the strip will not relax or stretch excessively during the rolling process, and will not cause excessive load on the equipment. In this embodiment, the tension difference can be set to be greater than 5KN; the tension difference can be adjusted according to actual conditions.

[0081] Exemplarily, according to the contents in Table 1, taking the high-strength cold-rolled automobile steel plate with a finished steel grade of JSC590R, serial number 2, finished product thickness of 1.6mm, and finished product width of 1590mm as an example, the inlet tension can be set to 127KN, ​​the outlet tension can be set to 135KN, the inlet tension preset value can be set to 90KN, and the outlet tension preset value can be set to 100KN. Through the above settings, the method can effectively control the rolling force of the equipment in the leveling mill, ensure that the elongation is within a reasonable range, improve the flatness and straightness of the strip, thereby effectively ensuring the quality of the strip and controlling the version.

[0082] In some examples, this also includes:

[0083] A leveling liquid is sprayed between the steel strip and the working roll, wherein the pressure of the leveling liquid is greater than or equal to 1.0 bar, and the concentration of the leveling liquid is 3% to 5%.

[0084] For example, the leveling fluid is a multifunctional liquid whose main functions include lubrication, cooling and cleaning. It plays an important protective and auxiliary role for the strip and working rolls during the rolling process of the leveling mill. A large friction will be generated between the strip and the working rolls during the rolling process. The leveling fluid can reduce this friction, reduce the wear and scratches on the surface of the strip, and thus improve the surface quality. During the high-pressure rolling process, a large amount of heat will be generated by the contact between the strip and the working rolls. The leveling fluid absorbs and carries away this heat to prevent the deformation of the strip or the degradation of material properties caused by excessive temperature. The leveling fluid can also effectively remove oxides or impurities on the surface of the strip and the working rolls, keep the rolling environment clean, and prevent these impurities from causing scratches or other defects on the surface of the strip.

[0085] The pressure of the leveling liquid is greater than or equal to 1.0 bar, ensuring that the leveling liquid can fully cover the surface of the strip and the working rolls to exert its lubrication and cooling effects. When the leveling liquid is sprayed between the strip and the working rolls at high pressure, a uniform liquid film can be quickly formed to reduce the friction between the strip and the working rolls. If the pressure of the leveling liquid is insufficient, the liquid may not be able to effectively cover the entire surface, resulting in increased friction in local areas, which in turn affects the flatness and surface finish of the strip. The pressure of 1.0 bar is a reasonable value derived from practical experience. This pressure can ensure that the leveling liquid can still be evenly distributed on the working rolls and the strip surface under high-speed rolling conditions, thereby avoiding surface defects caused by excessive friction. In this embodiment, the pressure of the leveling liquid can be set to be greater than or equal to 1.0 bar; the pressure of the leveling liquid can be adjusted according to actual conditions.

[0086] The concentration of the leveling fluid is 3% to 5% in order to strike a balance between the lubrication effect and the cooling effect. The concentration of the leveling fluid directly affects its lubrication and cooling performance. A higher concentration usually means a better lubrication effect, which can effectively reduce the friction between the strip and the working roll; while a lower concentration means a stronger cooling effect, which can more quickly take away the heat generated during the rolling process. The concentration of 3% to 5% is a balance range derived from factors such as the material, thickness, and rolling speed of the strip. The leveling fluid within this concentration range can provide sufficient lubrication for the rolling process to avoid scratches or wear on the surface of the strip; at the same time, it has a good cooling effect to prevent excessive temperature from adversely affecting material properties and process stability. In this embodiment, the concentration of the leveling fluid can be set to 3% to 5%; the concentration of the leveling fluid can be adjusted according to actual conditions.

[0087] For example, according to the content in Table 1, a high-strength cold-rolled automobile steel plate with a finished product grade of JSC590R, a serial number of 4, a finished product thickness of 2 mm, and a finished product width of 1534 mm is used as an example. The concentration of the leveling liquid is 4.8%, the pressure of the leveling liquid is 1.0 bar, and the density of the leveling liquid is 10.3 ml / m2 Through the above settings, the method can effectively control the rolling force of the equipment in the leveling mill, ensure the elongation is within a reasonable range, improve the flatness and straightness of the strip, thereby effectively ensuring the quality of the strip and controlling the version.

[0088] In some examples, this also includes:

[0089] When the straightness of the strip is less than the preset straightness, the bending roll force of the intermediate roll is adjusted to assist the working rolls in adjusting the straightness of the strip.

[0090] For example, the bending force of the intermediate roll controls the straightness of the strip by applying a certain force at both ends of the intermediate roll. This force bends the intermediate roll to produce a deformation opposite to the bending direction of the working roll, thereby compensating for the bending deformation of the working roll caused by the rolling force.

[0091] When the strip is not straight enough, that is, the curvature of the central part or edge part of the strip exceeds the allowable standard, this may lead to defects such as "thick in the center and thin at the edge" or "thick at the edge and thin in the center", which means that the strip is unevenly stressed during rolling, and the compressive stress of the working roll on the strip is unevenly distributed, resulting in excessive bending or deformation in the central part or edge part of the strip. By adjusting the bending roll force, additional bending force can be applied to the intermediate roll to compensate for the bending effect of the working roll and restore the straightness of the strip to the ideal state. The intermediate roll and the working roll usually work together, and the bending roll force of the intermediate roll directly affects the deformation degree of the working roll. By controlling the bending deformation of the intermediate roll, the distribution of the compressive stress applied by the working roll to the strip can be indirectly adjusted, thereby improving the straightness of the strip.

[0092] This preset straightness standard is usually set according to product specifications, quality requirements and process standards to ensure that the finished strip has good surface flatness and thickness consistency.

[0093] When it is detected that the straightness of the strip is lower than the preset value, the system will automatically adjust the bending force of the intermediate roll to assist the working roll in correcting the straightness of the strip. In this embodiment, the preset straightness can be set to 0.65mm. The preset straightness and adjusted tilt values ​​of different plate types will be different. If it is detected that the actual straightness deviation of the strip within any one-meter length exceeds the maximum allowable deviation value (such as 0.1mm), it is considered that the straightness of the strip is lower than the preset value. At this time, it is necessary to adjust the bending force of the intermediate roll to assist the working roll in adjusting the straightness of the strip.

[0094] In some examples, this also includes:

[0095] The working rolls and the intermediate rolls are non-chrome-plated rolls;

[0096] The processing technology grade of the working roll and the intermediate roll is non-superfinishing.

[0097] Exemplarily, non-chrome-plated rollers refer to working rollers and intermediate rollers whose surfaces are not chrome-plated. Chrome plating is generally used to improve the wear resistance and corrosion resistance of rollers. Chrome plating can improve the hardness and wear resistance of rollers, and is suitable for long-term high-intensity rolling operations, especially when processing hard steels. However, the manufacturing cost of chrome-plated rollers is relatively high, and in certain specific environments, the chrome plating layer is easily damaged. The manufacturing cost of non-chrome-plated rollers is low, and for some conventional steels, the high wear resistance or high hardness of chrome-plated rollers is not required, and non-chrome-plated rollers can provide sufficient service life. Due to the absence of a chrome plating layer, non-chrome-plated rollers are easier to repair after surface damage, and do not require complicated re-chrome plating.

[0098] Non-super-finishing means that the processing technology level of the working rolls and intermediate rolls does not meet the "super-finishing" standard. Super-finishing usually refers to very detailed surface treatment of the rolls to obtain extremely high surface finish and low roughness. The surface smoothness of super-finished rolls is very high, which is suitable for production scenarios with high precision and high surface quality requirements. Its meticulous surface treatment can significantly improve the surface flatness of the strip and reduce friction and surface defects. For conventional strip products, non-super-finishing working rolls and intermediate rolls can meet production needs. The rolled strip can still meet the basic flatness and thickness requirements.

[0099] The manufacturing process of non-superfinished rollers is much simpler than that of superfinished rollers, which means that the time and cost of producing these rollers are lower. In some mass production scenarios, non-superfinished rollers can be produced quickly at a lower cost and with lower wear requirements on the equipment. Superfinished rollers have extremely high requirements for surface finish, and once they are damaged during use, they are difficult to repair. Non-superfinished rollers have lower surface finish requirements, and maintenance and repair are easier, reducing the maintenance cycle and cost of the equipment.

[0100] In some examples, this also includes:

[0101] The working roll is a convex roll; the intermediate roll is a shifting roll.

[0102] For example, when rolling a strip, the pressure applied by the working rolls to the strip is not evenly distributed, usually with greater pressure in the center and less pressure at the edges. This uneven pressure can easily lead to excessive compression in the center of the strip and insufficient compression at the edges, ultimately causing the strip to be "thick in the center and thin at the edges," affecting the thickness uniformity of the product. The design of the convex roll can offset this bending effect by increasing the thickness in the middle of the working roll, making the force on the strip more uniform in the width direction and ensuring the flatness of the entire strip.

[0103] Roll shifting means that the intermediate roll can move within a certain range along its axial direction. The purpose of roll shifting is to balance the wear of the roll surface caused by excessive force in a local area during the rolling process of the strip, and to evenly distribute the pressure of the intermediate roll on the strip.

[0104] During continuous rolling, the contact area between the roller and the strip will gradually wear out over time, especially in certain local areas within the width of the strip. The shifting roller can change the contact position between the strip and the intermediate roller through its axial movement, avoiding excessive wear in local areas and thus extending the service life of the intermediate roller. The shifting roller movement function enables the intermediate roller to more flexibly adjust the pressure applied to the strip, thereby achieving a more uniform pressure distribution in the width direction of the strip and avoiding shape problems caused by excessive or insufficient local pressure.

[0105] The combination of convex rollers and shifting rollers can effectively improve the shape control of the strip. The convex rollers ensure the thickness consistency of the strip in the width direction by adjusting the compression force distribution of the working rolls; the shifting rollers further balance the pressure distribution of the strip during the rolling process through the movement function. This synergy is particularly suitable for the rolling needs of wide strips and can significantly reduce the ripples and uneven thickness of the strip surface.

[0106] The shifting of the rolls not only reduces the local wear of the intermediate rolls, but also reduces the vibration and instability caused by excessive local forces during the rolling process. The convex rolls further improve the stability of the rolling process by compensating for the natural bending of the working rolls.

[0107] The combination of convex rollers and shifting rollers makes the skin-pass mill more adaptable when processing strips of different widths and thicknesses. For wider strips, the convex rollers can effectively compensate for insufficient edge pressure, while the shifting rollers can adjust the contact position to avoid excessive force or wear in local areas.

[0108] For automotive steel plates or high-strength structural steel, the thickness control accuracy of the strip is extremely high. The combination of convex rollers and shifted rollers can effectively improve the rolling accuracy, reduce the thickness error caused by the deformation of the working rolls and intermediate rolls, and ensure that the quality of the finished strip meets the standards.

[0109] In some examples, this also includes:

[0110] The diameter of the above working roll is less than 435 mm.

[0111] For example, the diameter of the work roll determines the contact area between the work roll and the strip and the degree of deformation of the strip during rolling. A work roll with a smaller diameter will produce higher contact stress, thereby enhancing the deformation ability of the strip and improving its flatness and thickness uniformity. Therefore, the selection of a work roll with a diameter less than 435 mm is mainly to achieve higher rolling accuracy and better rolling effect.

[0112] Smaller diameter work rolls can better control the deformation process of the strip. Due to the smaller diameter of the work rolls, the contact stress of the strip is greater when passing through the work rolls, which enables the slight thickness changes of the strip to be more accurately controlled and adjusted, ensuring the thickness consistency of the entire strip in the width direction.

[0113] The smaller the diameter of the work roll, the smaller the rolling force required to roll the strip. This allows the skin-pass mill to achieve the same rolling effect at lower energy consumption. Especially in high-precision rolling, the small-diameter work roll can adjust the strip thickness in a more gentle way, thereby reducing errors in the rolling process.

[0114] For high-strength thin plates used in the automotive industry, a smaller diameter work roll helps improve the flatness and surface quality of the strip. Small diameter work rolls can accurately control the thickness of the strip and ensure the high precision requirements of the product.

[0115] See also Figure 2 , is a schematic structural diagram of a rolling force control device for a skin-pass mill provided in an embodiment of the present application, comprising:

[0116] The strip steel acquisition unit 21 is used to acquire the pattern information of the strip steel, wherein the pattern information includes width information and thickness information;

[0117] A height determination unit 22, used to determine the entrance height of the anti-wrinkle roller and the exit height of the anti-wrinkle roller based on the above-mentioned version information;

[0118] A diameter determination unit 23, used to determine the diameter of the working roll based on the above-mentioned version information;

[0119] A tension determination unit 24, used to determine the inlet tension and the outlet tension according to the working roll diameter;

[0120] The control rolling unit 25 is used to control the rolling process of the leveling mill based on the anti-wrinkle roller entrance height, the anti-wrinkle roller exit height, the entrance tension and the exit tension.

[0121] See also Figure 3 The embodiment of the present application also provides an electronic device 300, including a memory 310, a processor 320, and a computer program 311 stored in the memory 310 and executable on the processor. When the processor 320 executes the computer program 311, the steps of any of the above-mentioned methods for controlling the rolling force of the flat mill are implemented.

[0122] Since the electronic device introduced in this embodiment is a device used to implement a rolling force control device of a flat-pass mill in the embodiment of the present application, based on the method introduced in the embodiment of the present application, technical personnel in this field can understand the specific implementation mode of the electronic device of this embodiment and its various variations. Therefore, how the electronic device implements the method in the embodiment of the present application is not introduced in detail here. As long as the equipment used by technical personnel in this field to implement the method in the embodiment of the present application is within the scope of protection of this application.

[0123] During the specific implementation process, when the computer program 311 is executed by a processor, any implementation method in the embodiments corresponding to the first aspect can be implemented.

[0124] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0125] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-readable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-readable program code.

[0126] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0127] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0128] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0129] The present application also provides a computer program product, which includes computer software instructions. When the computer software instructions are executed on a processing device, the processing device executes Figure 1 The process of a method for controlling the rolling force of a flat-pass mill in the corresponding embodiment.

[0130] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website site, a computer, a server or a data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium can be any available medium that a computer can store or a data storage device such as a server or a data center that includes one or more available media integration. The available medium can be a magnetic medium, (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid state drive (SSD)), etc.

[0131] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0132] In the several embodiments provided in the present application, it should be understood that the disclosed devices, apparatuses and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0133] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0134] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0135] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), disk or optical disk and other media that can store program codes.

[0136] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

[0137] Although the preferred embodiments of this specification have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of this specification.

[0138] Obviously, those skilled in the art can make various changes and modifications to this specification without departing from the spirit and scope of this specification. Thus, if these modifications and variations of this specification fall within the scope of the claims of this specification and their equivalents, this specification is also intended to include these modifications and variations.

Claims

1. A method for controlling the rolling force of a skin-pass mill, characterized in that: The method comprises: Obtaining the pattern information of the strip steel, wherein the pattern information includes width information and thickness information; Determine the entrance height and exit height of the anti-wrinkle roller based on the version information; Determine the working roll diameter based on the version information; Determining the inlet tension and the outlet tension according to the working roll diameter; The rolling process of the skin-pass mill is controlled based on the anti-wrinkle roller entrance height, the anti-wrinkle roller exit height, the entrance tension and the exit tension.

2. The method according to claim 1, characterized in that The entrance height of the anti-wrinkle roller is greater than 130% of the first preset height value; and / or, The exit height of the anti-wrinkle roller is greater than 130% of the second preset height value; and / or, The inlet height of the anti-wrinkle roller is greater than the outlet height of the anti-wrinkle roller.

3. The method according to claim 1, characterized in that The outlet tension is greater than the outlet tension; and / or, The inlet tension is greater than 130%-150% of the first tension preset value; and / or, The outlet tension is greater than 130%-150% of the second tension preset value; and / or, The tension difference between the outlet tension and the inlet tension is greater than 5 KN.

4. The method according to claim 1, characterized in that: Also includes: A leveling liquid is sprayed between the steel strip and the working roll, wherein the pressure of the leveling liquid is greater than or equal to 1.0 bar, and the concentration of the leveling liquid is 3% to 5%.

5. The method according to claim 1, characterized in that Also includes: When the straightness of the steel strip is less than a preset straightness, the bending roll force of the intermediate roll is adjusted to assist the working roll in adjusting the straightness of the steel strip.

6. The method according to claim 5, characterized in that The working roll and the intermediate roll are non-chrome-plated rolls; the processing technology grade of the working roll and the intermediate roll is non-super-finishing.

7. The method according to claim 6, characterized in that The working roll is a convex roll; the intermediate roll is a shifting roll.

8. A rolling force control device for a skin-pass mill, characterized in that: include: A strip steel acquisition unit, used to acquire the pattern information of the strip steel, wherein the pattern information includes width information and thickness information; A height determination unit, used to determine an entrance height of the anti-wrinkle roller and an exit height of the anti-wrinkle roller based on the version information; A diameter determination unit, used for determining the diameter of the working roll based on the version information; A tension determination unit, used for determining an inlet tension and an outlet tension according to the working roll diameter; The rolling control unit is used to control the rolling process of the leveling mill based on the anti-wrinkle roller entrance height, the anti-wrinkle roller exit height, the entrance tension and the exit tension.

9. An electronic device, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor is used to implement the steps of a method for controlling the rolling force of a flat mill as described in any one of claims 1-7 when executing the computer program stored in the memory.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, a method for controlling the rolling force of a skin-pass mill as claimed in any one of claims 1 to 7 is implemented.

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