A method, device, equipment, medium and product for roll shape control of a work roll

Abstract

The application relates to a roll shape control method, device, equipment, medium and product of a work roll. The work roll is used for processing hot-rolled strips, and the work roll comprises two edge area regions and a middle area region along the width direction of the hot-rolled strips to be processed. A cubic CVC roll shape curve is used to control the roll shape of the two edge area regions, and a preset roll shape curve of the two edge area regions of the work roll is formed within the width range of the hot-rolled strips to be rolled. A cosine curve is set for the wave shape size of the rib waves of the middle area region, and the cosine curve is superposed with the cubic CVC roll shape curve, and a preset roll shape curve of the middle area region of the work roll is formed within the width range of the hot-rolled strips to be rolled. The application forms a special roll shape curve of the middle area region of the work roll within the width range of the hot-rolled strips, so that the work roll can control high-order waves, improve the rib waves, and almost does not affect the adjustment ability of the original cubic CVC roll shape curve on the crown.

Description

Technical Field

[0001] This invention belongs to the fields of metallurgical machinery, automation and rolling technology, and particularly relates to a method, device, equipment, medium and product for controlling the roll shape of a work roll. Background Technology

[0002] Plate and strip steel play a vital role in the national economy. Among them, high-strength, thin-gauge plates and strips, with their advantages of high strength, good performance, and lightweight, are widely used in agricultural machinery, high-strength shelving, truck bodies, solar panel supports, and automotive parts. However, at the same time, their production is more difficult than that of ordinary carbon steel, and they often face many challenges in the production process. One of these challenges is the presence of various complex waviness defects at the rolling mill exit.

[0003] Wavy shape is one of the important indicators for strip quality control. The main cause of wavy shape is uneven fiber elongation during the strip rolling process, leading to uneven internal stress in the transverse direction. When this internal stress exceeds the buckling limit, it manifests as visible wavy shape. Wavy shapes can be broadly classified into low-order wavy shapes (intermediate wavy or double-sided wavy, etc.) and high-order wavy shapes. Low-order wavy shapes can be addressed through methods such as bending roll control, initial roll shape configuration, and load optimization. High-order wavy shapes, mainly quarter-wave and rib-wave, currently lack effective solutions; current efforts primarily focus on troubleshooting equipment operation and ensuring proper temperature control.

[0004] Wavy shape control is a part of strip shape control technology, and roll shape technology is the most direct and active factor in strip shape control. Previous researchers have conducted extensive research on roll shape design; roll shapes such as CVC, HC, SmartCrown, PC, UPC, and HVC have all shown good application results in strip shape control. CVC technology, or Continuously Variable Crown technology, is a strip shape control technology developed by Schroeder SMS in Germany. Its core is to design the outline of paired rolls into an "S" shape and invert them 180° apart. Then, by using bidirectional movement of support rolls, intermediate rolls, or work rolls during operation, different roll gap shapes with varying crowns are obtained, thereby reducing strip shape errors and improving strip quality. However, tertiary CVC roll shapes do not possess the ability to control higher-order wavy shapes. Therefore, further research is needed on the control of rib wavy defects in high-strength, thin-gauge strips. Summary of the Invention

[0005] In order to overcome the problems existing in the current technology, the present invention provides a method, device, equipment, medium and product for controlling the roll shape of a work roll to solve the above-mentioned problems existing in the prior art.

[0006] A method for controlling the roll shape of a work roll, wherein the work roll is used to process hot-rolled strip, and the work roll includes two side regions and a middle region along the width direction of the hot-rolled strip to be processed. The roll shape of the two side regions is controlled by a cubic CVC roll shape curve, forming a preset roll shape curve for the two side regions of the work roll within the width range of the hot-rolled strip to be rolled. A cosine curve is set for the wave shape of the ribs in the middle region, and the cosine curve is superimposed with the cubic CVC roll shape curve to form a preset roll shape curve for the middle region of the work roll within the width range of the strip to be rolled.

[0007] In addition to the aspects described above and any possible implementations, a further implementation is provided in which the expression for the cubic CVC roller curve used in the two said edge regions is as follows: y1=a1x+a2x 2 +a3x 3 0≤x<x1, x2≤x<L, where y1 is the ordinate of the roll profile curve in the edge region; x is the lateral coordinate of the work roll with the left end of the work roll as the origin; x1 is the abscissa of the left end of the hot-rolled strip to be rolled in contact with the work roll surface; x2 is the abscissa of the right end of the hot-rolled strip to be rolled in contact with the work roll surface; L is the length of the work roll body; a1, a2, a3 are the coefficients of the cubic CVC roll profile curve.

[0008] In addition to the aspects and any possible implementations described above, a further implementation is provided in which the expression for setting the cosine curve of the rib wave size in the central region is: y2=Acos(ωx+f)+C x1≤x≤x2, where y2 is the ordinate of the cosine curve, x is the transverse coordinate of the work roll with the left end point of the work roll as the origin; x1 is the abscissa of the left end point of the hot-rolled strip to be rolled in contact with the roll surface of the work roll; and x2 is the abscissa of the right end point of the hot-rolled strip to be rolled in contact with the roll surface of the work roll.

[0009] C represents the offset of the cosine curve along the vertical axis. D is equal to half the width of the hot-rolled strip to be rolled; f is the initial phase of the cosine curve.

[0010] In addition to the aspects described above and any possible implementation, a further implementation is provided, which also includes keeping the value of y2 constant positive by shifting the cosine curve Acos(ωx+f) upward by an amplitude A, where C = A.

[0011] In addition to the aspects and any possible implementations described above, a further implementation is provided in which the expression obtained by superimposing the cosine curve and the cubic CVC roller curve is:

[0012] y3=a1x+a2x 2 +a3x3 -Acos(ωx+f)-A x1≤x<x2 where y3 is the longitudinal coordinate of the curve in the middle of the working roll.

[0013] In addition to the aspects and any possible implementations described above, a further implementation is provided in which the roll profile curve of the entire roll body of the work roll includes a cubic CVC roll profile curve y1 for the edge region and a roll profile curve y3 for the control center region, which is formed by superimposing a cosine curve and a cubic CVC roll profile curve, as expressed below:

[0014]

[0015] Where y is the longitudinal coordinate of the roll profile curve of the entire working roll body.

[0016] The present invention also provides a roll shape control device for a work roll, the control device being used to control the roll shape of the work roll, the work roll being used to process hot-rolled strip, the work roll including two side regions and a middle region along the width direction of the hot-rolled strip to be processed, the control device comprising:

[0017] The first control module is used to control the roll shape of the two side regions using a cubic CVC roll shape curve, forming a preset roll shape curve for the two side regions of the work roll within the width range of the hot-rolled strip to be rolled.

[0018] The second control module is used to set a cosine curve for the wave shape size of the rib wave in the middle region, and to superimpose the cosine curve with the cubic CVC roll shape curve to form a preset roll shape curve in the middle region of the work roll within the width range of the strip to be rolled.

[0019] The present invention also provides a computer device, characterized in that the computer device includes a processor and a memory, the memory storing a computer program, the computer program being loaded and executed by the processor to implement the method described.

[0020] The present invention also provides a computer-readable storage medium storing a computer program that is loaded and executed by a processor to implement the method as described.

[0021] The present invention also provides a computer program product, characterized in that the computer program product includes computer instructions, the computer instructions are stored in a computer-readable storage medium, and a processor reads from the computer-readable storage medium and executes the computer instructions to implement the method.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention has the following advantages over the prior art:

[0024] The present invention discloses a roll shape control method for work rolls, wherein the work roll includes two side regions and a middle region along the width direction of the hot-rolled strip to be processed. A cubic CVC roll shape curve is used to control the roll shape of the two side regions, forming a preset roll shape curve for the two side regions of the work roll within the width range of the hot-rolled strip to be rolled. A cosine curve is set for the rib wave size of the middle region, and the cosine curve is superimposed with the cubic CVC roll shape curve to form a preset roll shape curve for the middle region of the work roll within the width range of the strip to be rolled. The present invention improves the rib wave shape of the hot-rolled strip through curve design. After the design is completed, it can be ground by a grinding machine in a discrete point manner. This roll shape can significantly improve the high-order wave shape and rib wave of the hot-rolled strip, while not affecting the CVC's ability to adjust convexity. Attached Figure Description

[0025] Figure 1 This is a comparison diagram of the three-dimensional CVC curve of the present invention and the new roller profile curve;

[0026] Figure 2 A comparison diagram of the secondary and quaternary crown adjustment ranges of the three-stage CVC and the new roller shape;

[0027] Figure 3 This is a comparison chart of the roll gap difference between the three CVC rolls and the new roll shape. Detailed Implementation

[0028] To better understand the technical solution of this invention, the content of this invention includes, but is not limited to, the specific embodiments described below. Similar technologies and methods should be considered within the scope of protection of this invention. To make the technical problems to be solved, the technical solutions, and advantages of this invention clearer, a detailed description will be provided below in conjunction with the accompanying drawings and specific embodiments.

[0029] It should be understood that the embodiments described in this invention are merely some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0030] This invention provides a method for controlling the roll shape of a work roll used to process hot-rolled strip. The work roll includes two side regions and a central region along the width direction of the hot-rolled strip to be processed. A cubic CVC roll shape curve is used to control the roll shape of the two side regions, forming a preset roll shape curve for the two side regions of the work roll within the width range of the hot-rolled strip to be rolled. A cosine curve is set for the wave size of the ribs in the central region, and the cosine curve is superimposed on the cubic CVC roll shape curve to form a preset roll shape curve for the central region of the work roll within the width range of the strip to be rolled.

[0031] In an optional implementation, the cubic CVC roller curve used for the two edge regions is expressed as follows: y1=a1x+a2x 2 +a3x 3 0≤x<x1, x2≤x<L, where y1 is the ordinate of the roll profile curve in the edge region; x is the lateral coordinate of the work roll with the left end of the work roll as the origin; x1 is the abscissa of the left end of the hot-rolled strip to be rolled in contact with the work roll surface; x2 is the abscissa of the right end of the hot-rolled strip to be rolled in contact with the work roll surface; L is the length of the work roll body; a1, a2, a3 are the coefficients of the cubic CVC roll profile curve.

[0032] In one alternative implementation, since the cubic CVC roll profile cannot effectively control the rib waviness, it is necessary to adjust the roll profile at the rib location by increasing the compression at the rib location to improve the rib waviness. Therefore, this invention achieves this by superimposing a section of the curve in the middle region of the cubic CVC curve. Since the left and right rib waves of the triple CVC roll shape are symmetrical about the roll's center line, a symmetrical curve needs to be superimposed on the left and right parts of the center line. Therefore, this method selects a cosine function with periodicity and symmetry: y2=Acos(ωx+f)+C x1≤x≤x2, where y2 is the ordinate of the cosine curve, x is the transverse coordinate of the work roll with the left end of the work roll as the origin; x1 is the abscissa of the left end of the hot-rolled strip in contact with the work roll surface; x2 is the abscissa of the right end of the hot-rolled strip in contact with the work roll surface. By obtaining the corresponding coefficients, a preset roll shape curve in the middle region of the work roll is formed within the width range of the strip to be rolled, enabling the work roll to control the rib wave shape. C is the offset of the cosine curve in the longitudinal direction. D is equal to half the width of the hot-rolled strip to be rolled. To facilitate the superposition of y1 and y2, the value of y2 is set to always be positive. Therefore, the cosine curve Acos(ωx+f) is shifted upward by an amplitude A, so C=A; f is the initial phase of the cosine curve, and its value is determined by the following calculation method. To ensure that the cosine value at the left endpoint x1 where the strip contacts the roll surface is 0, then when x=x1, ωx+f=-π, thus obtaining the corresponding f; x1 is the abscissa of the left endpoint where the strip contacts the roll surface, in mm; x2 is the abscissa of the right endpoint where the hot-rolled strip contacts the work roll surface, in mm.

[0033] In an optional implementation, the roll profile curve in the middle of the roll body is formed by superimposing a cosine curve designed based on the size and position of the rib waves and a cubic CVC roll profile curve, as expressed below: y3=a1x+a2x 2 +a3x 3 -Acos(ωx+f)-Ax1≤x<x2

[0034] Where y3 is the longitudinal coordinate of the mid-section curve of the work roll radius.

[0035] In an optional implementation, the roll profile curve of the entire roll body is composed of a cubic CVC roll profile curve y1 controlling the roll profile of the edge region and a roll profile curve y3 controlling the roll profile of the middle region, which is formed by superimposing a cosine curve and a cubic CVC roll profile, as expressed below:

[0036]

[0037] Where y is the longitudinal coordinate of the work roll radius roll profile curve, thus completing the design of the work roll profile. The control method of the present invention forms a special work roll profile curve in the middle region within the width range of the strip, enabling the work roll to control higher order wavy shape and improve rib wavy shape, while hardly affecting the original three-dimensional CVC roll profile curve's ability to adjust convexity.

[0038] The present invention also provides a roll shape control device for a work roll, the control device being used to control the roll shape of the work roll, the work roll being used to process hot-rolled strip, the work roll including two side regions and a middle region along the width direction of the hot-rolled strip to be processed, the control device comprising:

[0039] The first control module is used to control the roll shape of the two side regions using a cubic CVC roll shape curve, forming a preset roll shape curve for the two side regions of the work roll within the width range of the hot-rolled strip to be rolled.

[0040] The second control module is used to set a cosine curve for the wave shape size of the rib wave in the central region, and to superimpose the cosine curve with the cubic CVC roll shape curve to form a preset roll shape curve in the central region of the work roll within the width range of the strip to be rolled.

[0041] The present invention also provides a computer device, the computer device including a processor and a memory, the memory storing a computer program, the computer program being loaded and executed by the processor to implement the method.

[0042] The present invention also provides a computer-readable storage medium storing a computer program, which is loaded and executed by a processor to implement the method described herein.

[0043] The present invention also provides a computer program product comprising computer instructions stored in a computer-readable storage medium, wherein a processor reads from the computer-readable storage medium and executes the computer instructions to implement the method described herein.

[0044] Example 1:

[0045] For a certain 2550mm hot strip mill, when rolling strip with a width of 1600mm, the 2550mm mill has a rib wave defect at a distance of ±400mm from the center of the strip. This problem has not been solved for a long time.

[0046] The original CVC roller profile curve at the site was

[0047] y1=a1x+a2x 2 +a3x 3

[0048] Where a1, a2, and a3 are known quantities.

[0049] a1 = 1.45503 × 10 -3 a2 = -1.39177 × 10 -6 a3 = 3.75924 × 10 -10

[0050] According to the method of the present invention, in order to eliminate the rib waviness of the original roll profile, a cosine curve is superimposed on the original CVC roll profile curve to adjust the rib waviness by determining the size of the rib waviness. Next, the work roll profile is redesigned, with the target improvement of the rib waviness being A = 0.012 mm.

[0051] Step 1: Based on the size of the rib wave and the strip width, design the cosine curve; the equation of the cosine curve is as follows:

[0052] y2=Acos(ωx+f)+A X1≤x≤x2

[0053] Where A is the amplitude, the value of which is determined by the size of the wave shape to be controlled, and A = 0.012 mm.

[0054] ω is the angular velocity, calculated using the following formula: Where the value of D is equal to half the strip width L, and the strip width L = 2550mm, the calculation yields...

[0055] f is the phase, and its value is determined according to the position. The specific determination method is as follows: Let x = x1, solve ωx + f = -π to get the corresponding f, where x1 is the horizontal coordinate of the left end point of the strip contacting the roller surface, and x1 = 475mm on site; let x = x1, substitute it into ωx + f = -π; and get f = -1.745π.

[0056] Step 2: The roll profile curve is formed by superimposing a cosine curve designed based on the size and position of the rib waves and a cubic CVC roll profile curve, y = y1 - y2, as shown in the following expression:

[0057]

[0058] Based on the parameters obtained above, the final expression for the overall roll profile curve is:

[0059]

[0060] This completes the design of the work roll shape.

[0061] To illustrate the differences between the new roll profile and the original triple CVC roll profile, the roll profile curves of the new roll profile and the triple CVC roll profile are plotted and compared below; for example... Figure 1 As shown, the roll shape at the rib positions on both sides 400mm from the midpoint of the strip is significantly reduced. Increasing the reduction at the rib positions will improve the rib waviness of the strip.

[0062] Comparing the secondary and quaternary convexity adjustment ranges of the new roll shape and the original CVC roll shape, such as... Figure 2 As shown, the adjustment capability of the new roll shape changes linearly with the amount of roll slippage, and the adjustment range is larger.

[0063] Compare the roll gap difference between the new roll shape and the original triple CVC roll shape, such as Figure 3 As shown, the roll gap difference at the rib position is significantly increased, which can effectively improve the rib waviness.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

[0065] Furthermore, those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the foregoing claims, any of the claimed embodiments can be used in any combination. The information disclosed in this background section is intended only to enhance the understanding of the general background of the invention and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

Claims

1. A roll shape control method of a work roll, characterized by, The work roll is used to process hot-rolled strip. The work roll includes two side regions and a middle region along the width direction of the hot-rolled strip to be processed. The roll profile curve of the entire roll body includes a cubic CVC roll profile curve of the side region and a roll profile curve of the middle region formed by superimposing the cosine curve and the cubic CVC roll profile curve. The expression is as follows: Where y is the longitudinal coordinate of the roll profile of the entire work roll body, and the expression for the longitudinal coordinate of the roll profile of the edge region is: x is the lateral coordinate of the work roll with the left end point of the work roll as the origin; x1 is the abscissa of the left end point of the hot-rolled strip to be rolled in contact with the roll surface of the work roll; x2 is the abscissa of the right end point of the hot-rolled strip to be rolled in contact with the roll surface of the work roll; L is the length of the work roll body; a1, a2, a3 are the coefficients of the cubic CVC roll profile curve; the expression for the ordinate of the cosine curve is: A is the amplitude of the cosine curve along the vertical axis. D is equal to half the width of the hot-rolled strip to be rolled; f is the initial phase of the cosine curve.

2. A roller shape control device for a work roll, characterized in that, The control device is used to implement the method of claim 1, controlling the roll shape of the work roll, the work roll being used to process hot-rolled strip, the work roll including two side regions and a middle region along the width direction of the hot-rolled strip to be processed, and the control device comprising: The first control module is used to control the roll shape of the two side regions using a cubic CVC roll shape curve, forming a preset roll shape curve for the two side regions of the work roll within the width range of the hot-rolled strip to be rolled. The second control module is used to set a cosine curve for the wave shape size of the rib wave in the middle region, and to superimpose the cosine curve with the cubic CVC roll shape curve to form a preset roll shape curve in the middle region of the work roll within the width range of the strip to be rolled.

3. A computer device, characterized in that, The computer device includes a processor and a memory, the memory storing a computer program that is loaded and executed by the processor to implement the method as claimed in claim 1.

4. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that is loaded and executed by a processor to implement the method as described in claim 1 above.

5. A computer program product, characterized in that, The computer program product includes computer instructions stored in a computer-readable storage medium, which a processor reads from and executes to implement the method as described in claim 1.

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