Electromagnetic control roller multi-section combined control method and device

Abstract

The application discloses a kind of electromagnetic regulation and control roller multi-section joint regulation method and device, it is related to plate strip rolling mill technical field. Including: the electromagnetic rod in the electromagnetic regulation and control roller to be regulated is carried out parameter regulation;Plate shape data after rolling is obtained to determine the electromagnetic rod to be regulated, and the regulation control roll gap shape is carried out;The electromagnetic rod needing to be carried out is obtained to be applied to outer section cooling and applied to outer section cooling;Electromagnetic rod is carried out electromagnetic regulation and control roll shape preset and obtains the undetermined coefficient of electromagnetic rod;According to undetermined coefficient, the actual regulation and control parameter matrix of electromagnetic rod is obtained by parameter matching of electromagnetic rod, and the multi-section joint regulation of the electromagnetic regulation and control roller to be regulated is completed.The application can carry out multi-section roll shape preset and parameter matching to the electromagnetic regulation and control roller of various forms electromagnetic rod, and feedback adjustment is carried out according to on-line detection data, and then the stability of electromagnetic regulation and control roll shape is ensured.

Description

Technical Field

[0001] This invention relates to the field of strip rolling mill technology, and in particular to a method and device for multi-segment joint control of electromagnetically controlled rolls. Background Technology

[0002] As a flexible roll shape control technology, electromagnetically controlled rolls can leverage their internal control characteristics to create a thermal expansion source within the roll. Through multi-segment joint control, comprehensive roll shape control is achieved, thereby controlling the roll gap shape of strip mills. The core technology of electromagnetic roll shape control lies in the thermal expansion source, with basic physical fields including an electromagnetic field, a temperature field, and a stress field. The electromagnetic field can induce a temperature field through induction heating, and the temperature field can induce a stress field through thermal expansion, ultimately resulting in the comprehensive expansion of the electromagnetically controlled roll. Furthermore, because the electromagnetically controlled roll and the electromagnetic rod have a connected structure, heat is axially conducted within both, making multi-segment stable control of the electromagnetically controlled roll shape particularly difficult. Simultaneously, the multi-segment electromagnetically controlled roll shape is formed by the joint control of various segment electromagnetic rods; therefore, the setting and selection of key parameters such as the magnetic parameters, control strategies, and control methods of each segment electromagnetic rod are crucial for the pre-setting of the electromagnetically controlled roll shape.

[0003] Currently, regarding the issues of axial heat transfer and roll shape preset in electromagnetically controlled rolls, the industry has proposed various solutions. Patent (CN201810170144.X) proposes a segmented flexible roll crown control roll, which incorporates several sets of annular electromagnetic rods for multi-segment roll shape control; patent (CN201210015091.7) proposes a support roll with adjustable interference fit, which incorporates multiple sets of electrothermal components to electrically drive localized hot roll shape, thereby adjusting the overall roll shape. While these patents propose basic devices for multi-segment roll shape generation, they do not provide practical and feasible control methods.

[0004] Patent (CN201910598123.2) proposes a multi-segment crown control roll with an internal cooling mechanism, which has an annular groove inside for cooling different sections inside the electromagnetically controlled roll; Patents (CN202011220287.0) and (CN202011219128.9) propose a novel external cooling device for rolling mills with segmented flexible control roll shape and its operation method, which sets a segmented cooling device outside the roll for controlled cooling of the electromagnetically controlled roll in online state; Patent (CN202111175856.9) proposes an electronic temperature control ring for internal cooling of roll shape electromagnetic control technology, which can be installed between different electromagnetic bars inside the roll to adjust the local hot roll shape. Although the aforementioned patents provide methods such as internal water cooling, external water cooling, and internal electronic cooling, and discuss control methods for related cooling methods, the ultimate goal of electromagnetically controlled rolls is to adjust the roll profile curve of electromagnetically controlled rolls. In particular, the method for setting the roll profile curve of multi-segment electromagnetically controlled rolls has not yet been proposed. Summary of the Invention

[0005] This invention addresses the problem that existing technologies have not yet proposed a method for setting the roll profile curve of multi-segment electromagnetically controlled rolls.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] On one hand, the present invention provides a method for multi-segment joint control of electromagnetically controlled rolls, which is implemented by electronic equipment and includes:

[0008] S1. Adjust the parameters of m groups of electromagnetic rods in the electromagnetic control roll to be controlled.

[0009] S2. Based on the parameter-controlled electromagnetic control roll, strip rolling is performed, the strip shape data after rolling is obtained, the electromagnetic bar to be controlled is determined, and the roll gap shape is controlled by adjusting the electromagnetic bar to be controlled.

[0010] S3. Obtain the electromagnetic rod that needs to be externally cooled in the electromagnetic rod to be controlled, and apply external cooling in the electromagnetic rod.

[0011] S4. Perform electromagnetic control roller shape preset for m groups of electromagnetic rods and obtain the undetermined coefficients of m groups of electromagnetic rods.

[0012] S5. Perform parameter matching on m groups of electromagnetic rods based on the undetermined coefficients to obtain the actual control parameter matrix of m groups of electromagnetic rods.

[0013] S6. Based on the actual control parameter matrix, complete the multi-segment joint control of the electromagnetic control roll to be controlled.

[0014] Optionally, the parameters in S1 include current input parameter I0, current frequency parameter f0, control temperature parameter T0, and temperature control mode.

[0015] The temperature control modes include continuous temperature control mode and periodic heating mode.

[0016] Optionally, electromagnetic control rolls are arranged on both sides of the strip on the strip mill, and an inlet side strip shape meter and an inlet side strip thickness meter are arranged on the inlet side of the strip mill, and an outlet side strip shape meter and an outlet side strip thickness meter are arranged on the outlet side of the strip mill.

[0017] Each of the m groups of electromagnetic rods corresponds to n / m control sections, and each group of electromagnetic rods is located at the center of its corresponding control section. The n control sections corresponding to the m groups of electromagnetic rods constitute the control zone. The inlet side plate shape meter and the inlet side plate thickness meter are used to obtain the inlet side plate shape data of the n control sections, and the outlet side plate shape meter and the outlet side plate thickness meter are used to obtain the outlet side plate shape data of the n control sections.

[0018] Optionally, in S2, acquiring the rolled plate shape data and determining the electromagnetic rod to be controlled includes:

[0019] S21. Obtain the plate shape data of n control sections after rolling, compare the plate shape data with the preset plate shape problem detection standard, and obtain one or more plate shape defect control sections.

[0020] S22. Based on one or more plate shape defect control sections, obtain one or more plate shape defect electromagnetic rods corresponding to the plate shape defect control sections.

[0021] S23. For each plate-shaped defect electromagnetic rod, pre-open the plate-shaped defect electromagnetic rod and acquire the detection data f from the inlet side plate thickness gauge. en (x) and the test data f from the outlet side plate thickness gauge ex (x), where x is the coordinate of the strip width.

[0022] S24. Based on the detection data f en (x) and f ex (x) Calculate the roll gap shape function, calculate the minimum roll gap opening based on the roll gap shape function, and calculate the roll gap shape deviation function based on the minimum roll gap opening.

[0023] S25. Determine whether there is a maximum value in the plate shape defect control section according to the roll gap shape deviation function, obtain the plate shape defect control section with the maximum value, and set the electromagnetic rod corresponding to the plate shape defect control section to the state to be controlled.

[0024] Optionally, in S3, the electromagnetic rod to be controlled is one that requires external segmental cooling. Applying external segmental cooling includes:

[0025] Based on the axial offset δ between the center position of the electromagnetic rod to be controlled and the maximum value of the plate defect control section, it is determined whether the electromagnetic rod to be controlled needs to be subjected to external segmented cooling. If δ is less than or equal to the preset electromagnetic rod contact area length, the electromagnetic rod to be controlled does not need to be subjected to external segmented cooling; if δ is greater than the preset electromagnetic rod contact area length, the electromagnetic rod to be controlled needs to be subjected to external segmented cooling.

[0026] Optionally, S4 includes the electromagnetic control of the m groups of electromagnetic rods, the preset of the roller shape, and the acquisition of the undetermined coefficients of the m groups of electromagnetic rods, including:

[0027] S41. Select one group of electromagnetic rods from the m groups in sequence, and obtain the roller shape of the electromagnetic rod and the electromagnetic rods on the adjacent sides of the electromagnetic rod respectively.

[0028] S42. Transfer the roll shape to the roll shape coordinate system of the electromagnetic control roll, and set the electromagnetic rod and the center position of the electromagnetic rod on both sides of the electromagnetic rod.

[0029] S43. Extract the roll gap shape deviation function of the control section formed by the electromagnetic rod and the electromagnetic rods on both sides adjacent to the electromagnetic rod, and convert the axial coordinate of the roll gap shape deviation function into a new coordinate centered on the midpoint of the control section formed.

[0030] S44. Randomly select 12 non-overlapping coordinate points (x) within the formed control zone. N1 ,y N1 ) to (x N12 ,y N12 ).

[0031] S45. The obtained electromagnetic rod and the roller shapes of the electromagnetic rods on both sides adjacent to the electromagnetic rod are superimposed according to their spatial positions to obtain the joint control roller shape of the control section. The joint control roller shape is then made to approximate y at 12 selected non-overlapping coordinate points. N1 To y N12 And obtain the undetermined coefficients.

[0032] S46. Randomly select 3 non-overlapping coordinate points within the formed control zone. The selected coordinate points do not overlap with the 12 coordinate points selected in step S44.

[0033] S47. Verify the shape of the control roller based on the three selected coordinate points. If the verification is successful, proceed to preset the roller shape of the next set of electromagnetic rods. If the verification fails, solve for the undetermined coefficients again and proceed to execute S44.

[0034] Optionally, in S5, parameter matching is performed on the m groups of electromagnetic rods based on the undetermined coefficients to obtain the actual control parameter matrix of the m groups of electromagnetic rods, including:

[0035] S51. Based on the undetermined coefficient matrix of m groups of electromagnetic rods and the control capability of the basic components of the electromagnetically controlled roll - basic temperature rise power P w The database performs parameter matching on m groups of electromagnetic rods to obtain the control parameter matrix of m groups of electromagnetic rods.

[0036] S52. Based on the control parameter matrix of m sets of electromagnetic rods, the axial characteristic coefficient of the electromagnetic rods, the radial characteristic coefficient of the electromagnetic rods, and the preset electromagnetic control roll heat exchange power, calculate the actual control parameter matrix of m sets of electromagnetic rods.

[0037] On the other hand, the present invention provides a multi-segment joint control device for electromagnetically controlled rolls, which is used to realize the multi-segment joint control method for electromagnetically controlled rolls. The device includes:

[0038] The parameter control module is used to control the parameters of m groups of electromagnetic rods in the electromagnetic control roll to be controlled.

[0039] The electromagnetic rod control module is used to roll strip based on the electromagnetic control roll after parameter adjustment, obtain the strip shape data after rolling, determine the electromagnetic rod to be controlled, and control the roll gap shape of the electromagnetic rod to be controlled.

[0040] The cooling control module is used to identify the electromagnetic rods that require external segmental cooling and to apply external segmental cooling to them.

[0041] The roller shape preset module is used to preset the roller shape for electromagnetic control of m sets of electromagnetic rods and to obtain the undetermined coefficients of m sets of electromagnetic rods.

[0042] The parameter matching module is used to perform parameter matching on m groups of electromagnetic rods based on undetermined coefficients, so as to obtain the actual control parameter matrix of m groups of electromagnetic rods.

[0043] The joint control module is used to complete the joint control of multiple sections of the electromagnetic control roll to be controlled based on the actual control parameter matrix.

[0044] Optionally, the parameters include current input parameter I0, current frequency parameter f0, control temperature parameter T0, and temperature control mode.

[0045] The temperature control modes include continuous temperature control mode and periodic heating mode.

[0046] Optionally, electromagnetic control rolls are arranged on both sides of the strip on the strip mill, and an inlet side strip shape meter and an inlet side strip thickness meter are arranged on the inlet side of the strip mill, and an outlet side strip shape meter and an outlet side strip thickness meter are arranged on the outlet side of the strip mill.

[0047] Each of the m groups of electromagnetic rods corresponds to n / m control sections, and each group of electromagnetic rods is located at the center of its corresponding control section. The n control sections corresponding to the m groups of electromagnetic rods constitute the control zone. The inlet side plate shape meter and the inlet side plate thickness meter are used to obtain the inlet side plate shape data of the n control sections, and the outlet side plate shape meter and the outlet side plate thickness meter are used to obtain the outlet side plate shape data of the n control sections.

[0048] Optionally, the electromagnetic rod control module is further used for:

[0049] S21. Obtain the plate shape data of n control sections after rolling, compare the plate shape data with the preset plate shape problem detection standard, and obtain one or more plate shape defect control sections.

[0050] S22. Based on one or more plate shape defect control sections, obtain one or more plate shape defect electromagnetic rods corresponding to the plate shape defect control sections.

[0051] S23. For each plate-shaped defect electromagnetic rod, pre-open the plate-shaped defect electromagnetic rod and acquire the detection data f from the inlet side plate thickness gauge. en (x) and the test data f from the outlet side plate thickness gauge ex (x), where x is the coordinate of the strip width.

[0052] S24. Based on the detection data f en (x) and f ex (x) Calculate the roll gap shape function, calculate the minimum roll gap opening based on the roll gap shape function, and calculate the roll gap shape deviation function based on the minimum roll gap opening.

[0053] S25. Determine whether there is a maximum value in the plate shape defect control section according to the roll gap shape deviation function, obtain the plate shape defect control section with the maximum value, and set the electromagnetic rod corresponding to the plate shape defect control section to the state to be controlled.

[0054] Optionally, the cooling control module is further used for:

[0055] Based on the axial offset δ between the center position of the electromagnetic rod to be controlled and the maximum value of the plate defect control section, it is determined whether the electromagnetic rod to be controlled needs to be subjected to external segmented cooling. If δ is less than or equal to the preset electromagnetic rod contact area length, the electromagnetic rod to be controlled does not need to be subjected to external segmented cooling; if δ is greater than the preset electromagnetic rod contact area length, the electromagnetic rod to be controlled needs to be subjected to external segmented cooling.

[0056] Optionally, the roller shape preset module is further used for:

[0057] S41. Select one group of electromagnetic rods from the m groups in sequence, and obtain the roller shape of the electromagnetic rod and the electromagnetic rods on the adjacent sides of the electromagnetic rod respectively.

[0058] S42. Transfer the roll shape to the roll shape coordinate system of the electromagnetic control roll, and set the electromagnetic rod and the center position of the electromagnetic rod on both sides of the electromagnetic rod.

[0059] S43. Extract the roll gap shape deviation function of the control section formed by the electromagnetic rod and the electromagnetic rods on both sides adjacent to the electromagnetic rod, and convert the axial coordinate of the roll gap shape deviation function into a new coordinate centered on the midpoint of the control section formed.

[0060] S44. Randomly select 12 non-overlapping coordinate points (x) within the formed control zone. N1 ,y N1 ) to (x N12 ,y N12 ).

[0061] S45. The obtained electromagnetic rod and the roller shapes of the electromagnetic rods on both sides adjacent to the electromagnetic rod are superimposed according to their spatial positions to obtain the joint control roller shape of the control section. The joint control roller shape is then made to approximate y at 12 selected non-overlapping coordinate points. N1 To y N12 And obtain the undetermined coefficients.

[0062] S46. Randomly select 3 non-overlapping coordinate points within the formed control zone. The selected coordinate points do not overlap with the 12 coordinate points selected in step S44.

[0063] S47. Verify the shape of the control roller based on the three selected coordinate points. If the verification is successful, proceed to preset the roller shape of the next set of electromagnetic rods. If the verification fails, solve for the undetermined coefficients again and proceed to execute S44.

[0064] Optionally, the parameter matching module is further used for:

[0065] S51. Based on the undetermined coefficient matrix of m groups of electromagnetic rods and the control capability of the basic components of the electromagnetically controlled roll - basic temperature rise power P w The database performs parameter matching on m groups of electromagnetic rods to obtain the control parameter matrix of m groups of electromagnetic rods.

[0066] S52. Based on the control parameter matrix of m sets of electromagnetic rods, the axial characteristic coefficient of the electromagnetic rods, the radial characteristic coefficient of the electromagnetic rods, and the preset electromagnetic control roll heat exchange power, calculate the actual control parameter matrix of m sets of electromagnetic rods.

[0067] On the one hand, an electronic device is provided, which includes a processor and a memory, wherein the memory stores at least one instruction, which is loaded and executed by the processor to realize the above-mentioned electromagnetic control roll multi-segment joint control method.

[0068] On the one hand, a computer-readable storage medium is provided, wherein at least one instruction is stored in the storage medium, and the at least one instruction is loaded and executed by a processor to implement the above-described electromagnetic control roll multi-segment joint control method.

[0069] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following:

[0070] The above-mentioned scheme provides a method and apparatus for multi-segment joint control of electromagnetically controlled rolls. This method can preset and match the roll shape and parameters of electromagnetically controlled rolls equipped with various types of electromagnetic bars, and make feedback adjustments based on online detection data, thereby ensuring the stability of the electromagnetically controlled roll shape. This invention proposes two typical electromagnetic bar layout methods for multi-segment electromagnetically controlled rolls and provides a detailed and reliable method for multi-segment joint control of roll shape. Focusing on multi-segment joint control of roll shape electromagnetic control technology, this invention proposes a universally applicable roll shape control method and provides a detailed control process. Attached Figure Description

[0071] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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.

[0072] Figure 1 This is a schematic diagram of the multi-segment joint control method for electromagnetically controlled rolls provided in an embodiment of the present invention;

[0073] Figure 2 This is a schematic diagram of the rolling mill structure provided in an embodiment of the present invention;

[0074] Figure 3 This is a schematic diagram of component partitioning provided in an embodiment of the present invention.

[0075] Figure 4 This is a schematic diagram of a typical electromagnetic rod layout for a multi-segment electromagnetically controlled roll provided in an embodiment of the present invention;

[0076] Figure 5 This is a schematic diagram of another typical electromagnetic rod layout for multi-segment electromagnetically controlled rolls provided in an embodiment of the present invention;

[0077] Figure 6 This is a schematic diagram of the overall process of the electromagnetic control roll multi-segment joint control method provided in the embodiments of the present invention;

[0078] Figure 7 This is a flowchart illustrating the solution for the roller shape control demand provided in an embodiment of the present invention;

[0079] Figure 8 This is a flowchart of the roller shape preset provided in the embodiments of the present invention;

[0080] Figure 9 This is a block diagram of the electromagnetic control roll multi-segment joint control device provided in the embodiments of the present invention;

[0081] Figure 10 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention;

[0082] Figure label:

[0083] 1 Lower support roll, 2 Lower roll-shaped electromagnetic control roll, 3 Inlet side plate shape gauge, 4 Inlet side plate thickness gauge, 5 Upper support roll, 6 Upper roll-shaped electromagnetic control roll, 7 Outlet side plate thickness gauge, 8 Outlet side plate shape gauge, 2-1 Electromagnetically control roll body, 2-2 Electromagnetic rod, 2-3 Electromagnetically control roll center symmetry line. Detailed Implementation

[0084] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0085] like Figure 1 As shown, this embodiment of the invention provides a method for multi-segment joint control of electromagnetically controlled rolls, which can be implemented by electronic equipment. Figure 1 The flowchart shown is for a multi-segment joint control method for electromagnetically controlled rolls. The processing flow of this method may include the following steps:

[0086] S1. Adjust the parameters of m groups of electromagnetic rods in the electromagnetic control roll to be controlled.

[0087] One feasible implementation method is, for example Figure 2 As shown, electromagnetic control rolls are installed on both sides of the strip on the strip mill. An inlet-side shape gauge and an inlet-side thickness gauge are installed on the inlet side of the strip mill, and an outlet-side shape gauge and an outlet-side thickness gauge are installed on the outlet side of the strip mill. The strip is divided into n equally spaced control sections along the width direction from the operating side to the drive side. The operating side can be the first control section, and the drive side can be the nth control section.

[0088] Furthermore, such as Figure 3 As shown, m sets of electromagnetic rods are installed at equal intervals inside the electromagnetically controlled roll, allowing for independent control of each section. Each set of electromagnetic rods corresponds to n / m control sections, and each set of electromagnetic rods is located at the center of its corresponding control section. The n control sections corresponding to the m sets of electromagnetic rods constitute the control zone. The inlet side plate shape meter and the inlet side plate thickness meter are used to acquire the inlet side plate shape data of the n control sections, and the outlet side plate shape meter and the outlet side plate thickness meter are used to acquire the outlet side plate shape data of the n control sections.

[0089] Optionally, the parameters may include current input parameter I0, current frequency parameter f0, control temperature parameter T0, and temperature control mode, wherein the temperature control mode includes continuous temperature control mode and periodic heating mode.

[0090] Furthermore, such as Figure 4 , 5 As shown, the electromagnetic rods need to be arrayed at equal intervals along the central through-hole of the roll, with a spacing of d. ES The length of the electromagnetic rod should be greater than 10% of the total length. The electromagnetic rod must employ either longitudinal magnetic flux, transverse magnetic flux, or single-wire heating. The axial characteristic coefficient η of the electromagnetic rod can be calculated using the actual temperature rise effective power calculation method in S52. a Radial characteristic coefficient η r Equivalent structure. The electromagnetic rod can be installed at the center of the roll, with equal spacing d towards the operating and transmission sides. ES Alternatively, m-1 sets of electromagnetic rods can be installed on the ground; or, with the center of the roll as the center of symmetry, d-shaped rods can be installed on both sides of that center. ES Install the electromagnetic rod at position / 2, and then, with equal spacing d towards the operating side and the transmission side. ES Install m-2 sets of electromagnetic rods on the ground.

[0091] S2. Based on the parameter-controlled electromagnetic control roll, strip rolling is performed, the strip shape data after rolling is obtained, the electromagnetic bar to be controlled is determined, and the roll gap shape is controlled by adjusting the electromagnetic bar to be controlled.

[0092] In one feasible implementation, the strip mill is started in the forward rolling direction from the inlet side to the outlet side, so that the upper and lower work rolls rotate in opposite directions; after the speed of the two rolls stabilizes and the strip is rolled to 0.1% of the raw material length, the shape gauge and thickness gauge on the inlet side and the outlet side are turned on.

[0093] Optionally, such as Figure 6 , 7 As shown, step S2 involves acquiring the rolled plate shape data and determining the electromagnetic rod to be controlled, including:

[0094] S21. Obtain the plate shape data of n control sections after rolling, compare the plate shape data with the preset plate shape problem detection standard, and obtain one or more plate shape defect control sections.

[0095] S22. Based on one or more plate shape defect control sections, obtain one or more plate shape defect electromagnetic rods corresponding to the plate shape defect control sections.

[0096] In a feasible implementation manner, by comparing the n-channel strip shape information, s times the I value is selected as the strip shape problem detection standard. I is the evaluation index (IU value) of the strip flatness, and its meaning is the relative growth of the curve length in the wavy section compared to the standard length of the flat part. The relative growth corresponding to 1I is approximately 10 -5 , locate the strip shape defect section [i1, i2] section (0 < i1 < i2 < n), and match [i1, i2] to [j1, j2] (0 < j1 < j2 < m) of the electromagnetic control roll; if multiple strip shape defect areas are found after detection, extract the partition positions [i3, i4], [i5, i6], [i7, i8], etc. of these strip shape defect areas in the shape meter respectively, and match the defect areas detected by the shape meter to the control areas [j3, j4], [j5, j6], [j7, j8], etc. of the electromagnetic control roll one by one.

[0097] S23. For each strip shape defect electromagnetic rod, pre-open the strip shape defect electromagnetic rod and obtain the detection data f en (x) of the entrance side thickness gauge and the detection data f ex (x) of the exit side thickness gauge, where x is the strip width coordinate.

[0098] In a feasible implementation manner, pre-open the electromagnetic rods in the [j1, j2] section or the electromagnetic rods in the sections such as [j3, j4], [j5, j6], [j7, j8]; extract the detection data f en (x), f ex (x) of the thickness gauges on the entrance side and the exit side, where x is the strip width coordinate.

[0099] S24. Calculate the roll gap shape function based on the detection data f en (x) and f ex (x), calculate the minimum roll gap opening based on the roll gap shape function, and calculate the roll gap shape deviation function based on the minimum roll gap opening.

[0100] In a feasible implementation manner, calculate the roll gap shape function of this pass, h rg (x) = f en (x) - f ex (x). Subsequently, calculate the minimum roll gap opening h min = min(h rg (x)), and the roll gap shape deviation function h rg-deviation (x) = h rg (x) - h min .

[0101] S25. Determine whether there is a maximum value in the plate shape defect control section according to the roll gap shape deviation function, obtain the plate shape defect control section with the maximum value, and set the electromagnetic rod corresponding to the plate shape defect control section to the state to be controlled.

[0102] In one feasible implementation, for the electromagnetically controlled roll control zone corresponding to the plate shape defect, the roll gap shape deviation function h in that zone within the current pass is calculated. rg-deviation (x). If a maximum value exists in the [j1,j2] segment or in segments such as [j3,j4], [j5,j6], [j7,j8], then the electromagnetic rod in that segment can be determined to be in a state to be controlled. If no maximum value appears in a certain segment, it is necessary to compare whether there is a maximum value in the electromagnetic rod control area adjacent to that segment, and then set the electromagnetic rod in the adjacent control area to be in a state to be controlled.

[0103] S3. Obtain the electromagnetic rod that needs to be externally cooled in the electromagnetic rod to be controlled, and apply external cooling in the electromagnetic rod.

[0104] In one feasible implementation, the axial offset δ between the center position of the electromagnetic rod to be controlled and the maximum value of the corresponding control area is calculated. If δ is less than 5% of the contact area length of the electromagnetic rod, then no external segmented cooling is required for this group of electromagnetic rods; if δ is greater than 5% of the contact area length of the electromagnetic rod, then external segmented cooling is required for this group of electromagnetic rods.

[0105] S4. Perform electromagnetic control roller shape preset for m groups of electromagnetic rods and obtain the undetermined coefficients of m groups of electromagnetic rods.

[0106] Optionally, step S4 above may include the following steps S41-S47:

[0107] S41. Select one group of electromagnetic rods from the m groups in sequence, and obtain the roller shape of the electromagnetic rod and the electromagnetic rods on the adjacent sides of the electromagnetic rod respectively.

[0108] One feasible implementation method is, for example Figure 8 As shown, according to the influence law of adjacent electromagnetic rods, the roller shape produced by every three electromagnetic rods follows the formula y = f(x c )=C0+(4C w4 -C w2 )x c 2 -4C w4 x c 4 To describe. Where x c For the relative coordinates of the roller shape controlled by a single electromagnetic rod, C0, C w2 C w4 is the coefficient of the electromagnetic rod.

[0109] S42. Transfer the roll shape to the roll shape coordinate system of the electromagnetic control roll, and set the electromagnetic rod and the center position of the electromagnetic rod on both sides of the electromagnetic rod.

[0110] In one feasible implementation, the roll shape generated by the three electromagnetic rods is transferred to the roll shape coordinate system of the electromagnetically controlled roll, and the center positions of each electromagnetic rod are configured. Then, y1 = f1(x c-N )=f1(x c -d ES ), y2=f2(x c-N )=f2(x c ), y3=f3(x c-N )=f3(x c +d ES ).

[0111] S43. Extract the roll gap shape deviation function of the control section formed by the electromagnetic rod and the electromagnetic rods on both sides adjacent to the electromagnetic rod, and convert the axial coordinate of the roll gap shape deviation function into a new coordinate centered on the midpoint of the control section formed.

[0112] In one feasible implementation, the roll gap shape deviation function of the electromagnetic control roll control zone is extracted, and the axial coordinates of the segmented roll gap shape deviation function are converted into new coordinates centered on the midpoint of the segment.

[0113] S44. Randomly select 12 non-overlapping coordinate points (x) within the formed control zone. N1 ,y N1 ) to (x N12 ,y N12 ).

[0114] S45. The obtained electromagnetic rod and the roller shapes of the electromagnetic rods on both sides adjacent to the electromagnetic rod are superimposed according to their spatial positions to obtain the joint control roller shape of the control section. The joint control roller shape is then made to approximate y at 12 selected non-overlapping coordinate points. N1 To y N12 And obtain the undetermined coefficients.

[0115] In one feasible implementation, the independent roller shapes of three electromagnetic rods are superimposed according to their spatial positions to obtain the coordinated roller shape y of that section. lk =f lk (x c-N )=f1(x c-N )+f2(x c-N )+f3(x c-N The control roller shape of this section is then made to approximate y at the 12 coordinate points selected in S44. N1 To y N12The difference between the controlled roller shape and the approximation target must be less than 5 μm; otherwise, the parameters need to be redefined. The undetermined coefficients include the coefficient C of the first electromagnetic rod. 01 C w2-1 C w4-1 The coefficient C of the second electromagnetic rod 02 C w2-2 C w4-2 The coefficient C of the third electromagnetic rod 03 C w2-3 C w4-3 .

[0116] S46. Randomly select 3 non-overlapping coordinate points within the formed control zone. The selected coordinate points do not overlap with the 12 coordinate points selected in step S44.

[0117] In one feasible implementation, three coordinate points (x, y ... N13 ,y N13 ), (x N14 ,y N14 ), (x N15 ,y N15 The three coordinate points mentioned above must not overlap with the 12 coordinate points selected by S44, and there must also be no overlap between the three coordinate points.

[0118] S47. Verify the shape of the control roller based on the three selected coordinate points. If the verification is successful, proceed to preset the roller shape of the next set of electromagnetic rods. If the verification fails, solve for the undetermined coefficients again and proceed to execute S44.

[0119] In one feasible implementation, the control roll shape with fixed parameters is verified using three newly selected coordinate points. If the difference between the control roll shape at the three coordinate points and the approximation target is less than 5 μm, the roll shape preset for that section is completed, and the roll shape preset for the next section is then performed. If the difference between the control roll shape at the three coordinate points and the approximation target is greater than 5 μm, the roll shape preset for that section is invalid, and the undetermined coefficients need to be solved again, and steps S44 to S47 are executed.

[0120] S5. Perform parameter matching on m groups of electromagnetic rods based on the undetermined coefficients to obtain the actual control parameter matrix of m groups of electromagnetic rods.

[0121] Optionally, step S5 may include the following steps S51 and S52:

[0122] S51. Based on the undetermined coefficient matrix of m groups of electromagnetic rods and the control capability of the basic components of the electromagnetically controlled roll - basic temperature rise power P w The database performs parameter matching on m groups of electromagnetic rods to obtain the control parameter matrix of m groups of electromagnetic rods.

[0123] In one feasible implementation, the matrix C of undetermined coefficients of each electromagnetic bar required for the electromagnetically controlled roll shape configuration in this pass can be obtained through S4; subsequently, based on the control capability of the basic components of the electromagnetically controlled roll - the basic temperature rise power P... w The database is used to match the parameters of each group of electromagnetic rods, resulting in the electromagnetic rod control parameter matrix V for each group, as shown in equation (1) below:

[0124]

[0125] S52. Based on the control parameter matrix of m sets of electromagnetic rods, the axial characteristic coefficient of the electromagnetic rods, the radial characteristic coefficient of the electromagnetic rods, and the preset electromagnetic control roll heat exchange power, calculate the actual control parameter matrix of m sets of electromagnetic rods.

[0126] In one feasible implementation, the axial characteristic coefficient η of the electromagnetic rod is calculated based on the structural form of the electromagnetic rod mounted on the electromagnetic control roll. a Radial characteristic coefficient η r Based on the heat exchange conditions of the electromagnetically controlled roll, the preset heat exchange power P of the electromagnetically controlled roll is determined. ECR-change ; Comprehensive calculation of the actual control parameter matrix V of each group of electromagnetic rods act As shown in equation (2):

[0127]

[0128] Furthermore, the actual effective power P of temperature rise w-act The calculation must follow formula (3):

[0129] P w-act =g(η a ,η r )h(I 0-act ,f 0-act )-P ECR-change (3)

[0130] Wherein, g(η) a ,η r ) is the overall efficiency function, h(I) 0-act ,f 0-act ) is the total power function.

[0131] S6. Based on the actual control parameter matrix, complete the multi-segment joint control of the electromagnetic control roll to be controlled.

[0132] Optionally, step S6 may include the following steps S61 and S62:

[0133] S61. During the rolling process, the control is activated in continuous control mode, and the data from the shape gauge and thickness gauge at the inlet and outlet are monitored during the process. If the roll gap shape deviation function hrg-deviation If the value of (x) is close to zero, it is determined that the target of electromagnetic control of the roller shape has been achieved, and the continuous control mode can be switched to the periodic heating mode; if the roller gap shape deviation function h rg-deviation If (x) still has a large difference, it is determined that the current control step has not yet achieved the target of electromagnetic control for the roll shape. Therefore, it is necessary to detect the roll gap shape deviation function h in S61. rg-deviation Based on (x), execute S2 to S6 again.

[0134] S82. When in continuous control mode, the control temperature T0 must be the control limit temperature of the electromagnetic rod. If the temperature monitored by the electromagnetic rod exceeds the control temperature T0 under the control parameters and control mode in S61, the continuous control mode should be switched directly to the periodic heating mode to prevent the electromagnetic rod from being damaged due to excessive heat in the heating zone.

[0135] For example:

[0136] A1. A shape gauge and a thickness gauge are installed on the inlet and outlet sides of the strip mill, respectively. Then, in the width direction of the rolled piece, 20 control sections are divided at equal intervals from the operating side to the drive side. The operating side is the first control section, and the drive side is the 20th control section.

[0137] A2. Five sets of electromagnetic rods are installed at equal intervals on the electromagnetic control rolls. Each set of electromagnetic rods corresponds to the control area of ​​four shape gauges and thickness gauges. The electromagnetic rods are located at the center of the control areas of the four shape gauges and thickness gauges, and each set of electromagnetic rods can be independently controlled.

[0138] A3. Start the strip mill in the forward rolling direction from the "entry side" to the "exit side" and make the upper and lower work rolls rotate in opposite directions. After the speed of the two rolls stabilizes and the strip has been rolled for 2.7m, turn on the shape gauge and thickness gauge on the entry side and the exit side.

[0139] A4. Collect post-rolling plate shape data to determine the required amount of electromagnetic control for roll shape, including A41-A44.

[0140] A41. Compare the 20-channel plate shape information, select the plate shape problem detection standard as 20I, locate the plate shape defect section [2,4], and match the [2,4] of the plate shape defect section to the [1,2] of the electromagnetic control roll.

[0141] A42. Electromagnetic rods in the [1,2] section of the pre-opening electromagnetic control roll, and thickness gauge data f from the inlet and outlet sides. en (x), f ex (x), where x is the plate width coordinate.

[0142] A43. Calculate the roll gap shape function for this pass, h. rg (x)=f en (x)-fex (x)=0.3265x 4 +1.27x 2 +10.8531. Then, calculate the minimum roll gap h for this pass. min =min(h) rg (x))=0.32mm, and the roll gap shape deviation function h for this pass. rg-deviation (x)=h rg (x)-h min =0.3265x 4 +1.27x 2 +10.5331.

[0143] A44. Within the electromagnetic control roll control zone corresponding to each plate shape defect section, analyze the roll gap shape deviation function h of this pass in that region. rg-deviation (x); There is a maximum value in the [1,2] section of the electromagnetic control roll, which can be used to determine the electromagnetic rod in the corresponding section as the electromagnetic rod to be controlled. The roll gap shape can be controlled by adjusting these electromagnetic rods.

[0144] A5. Calculate the axial offset δ = 0.3 mm between the center position of the electromagnetic rod to be controlled and the maximum value of the corresponding control area. If δ is less than 5% = 2.5 mm of the contact area length of the electromagnetic rod, then there is no need to consider applying external segmented cooling to this group of electromagnetic rods.

[0145] A6. From the operating side to the transmission side, electromagnetic control roller shape presets are performed one by one according to the roller shape requirements of each section, including A61-A67.

[0146] A61. The [1,2] section of the electromagnetically controlled roll includes an operating-side electromagnetic rod (referred to as rod 1), which no longer includes other electromagnetic rods on the operating side, but has an adjacent electromagnetic rod (referred to as rod 2) on the drive side. The roll shape produced by rod 1 and rod 2 can be determined according to y = f(x c )=C0+(4C w4 -C w2 )x c 2 -4C w4 x c 4 Please describe, where x c The relative coordinates of the roller shape are controlled by a single electromagnetic rod.

[0147] A62. Transferring the roll shape generated by the two electromagnetic rods to the roll shape coordinate system of the electromagnetically controlled roll, and configuring the center positions of each electromagnetic rod, then we have y1=f1(x c-N )=f1(x c -d ES ), y2=f2(x c-N )=f2(x c), y3=f3(x c-N )=f3(x c +d ES ).

[0148] A63. Extract the roll gap shape deviation function of the electromagnetic control roll control zone, and convert the axial coordinates of the segmented roll gap shape deviation function into new coordinates centered on the midpoint of the segment.

[0149] A64. Randomly select 12 coordinate points within this section. None of the 12 coordinate points overlap.

[0150] A65. By superimposing the independent roller shapes of three electromagnetic rods according to their spatial positions, the coordinated roller shape y of this section is obtained. lk =f lk (x c-N )=f1(x c-N )+f2(x c-N )+f3(x c-N The control roller shape of this section is then made to approximate y at the 12 coordinate points selected in A64. N1 To y N12 The difference between the controlled roller shape and the approximation target must be less than 5 μm; otherwise, the parameters need to be redefined. The undetermined coefficients include the coefficient C for one rod. 01 =3.9617, C w2-1 =-0.9782, C w4-1 =1.3396, coefficient C of 2 bars 02 =5.1128, C w2-2 =-0.1181, C w4-2 =0.9953.

[0151] A66. Randomly select 3 coordinate points again (x N13 ,y N13 ), (x N14 ,y N14 ), (x N15 ,y N15 The three coordinate points mentioned above must not overlap with the 12 coordinate points selected by A64, and there must also be no overlap between the three coordinate points.

[0152] A67. Verify the control roll shape with fixed parameters using the three newly selected coordinate points; if the difference between the control roll shape at the three coordinate points and the approximation target is less than 5μm, then the roll shape preset for this section is complete.

[0153] A7. From the operating side to the transmission side, perform parameter matching on each group of electromagnetic rods one by one, including A71 and A72.

[0154] A71. The matrix C of undetermined coefficients of each electromagnetic rod required for the electromagnetic control roll shape configuration in this pass can be obtained through A6; subsequently, based on the control capability of the basic components of the electromagnetic control roll - the basic temperature rise power P... w The database is used to match the parameters of each group of electromagnetic rods, and the control parameter matrix V of each group of electromagnetic rods is obtained as shown in the following formula (4):

[0155]

[0156] A72. Calculate the axial characteristic coefficient η of the electromagnetic rod mounted on the electromagnetic control roll, based on its structural form. a =1, Radial characteristic coefficient η r =1; Based on the heat exchange conditions of the electromagnetically controlled roll, the preset heat exchange power P of the electromagnetically controlled roll is determined. ECR-change =2.06W; Comprehensive calculation of the actual control parameter matrix V of each group of electromagnetic rods act As shown in equation (5):

[0157]

[0158] A8. Implement electromagnetic control of the rolls according to the actual control parameter matrix of each group of electromagnetic bars. During the rolling process, activate the control in continuous control mode and monitor the shape and thickness gauge data at the inlet and outlet sides. After 39 seconds, the roll gap shape deviation function h... rg-deviation The value of (x) is close to zero. At this point, the target of the roller electromagnetic control has been achieved, and the continuous control mode can be switched to the periodic heating mode.

[0159] Furthermore, this invention can also be used to implement a platform for the multi-segment joint control method of electromagnetically controlled rolls, providing new research methods and ideas for the industrial-scale testing of this method.

[0160] This invention provides a method and apparatus for multi-segment joint control of electromagnetically controlled rolls. This method allows for multi-segment roll shape presetting and parameter matching of electromagnetically controlled rolls equipped with various types of electromagnetic bars, and provides feedback adjustments based on online detection data, thereby ensuring the stability of the electromagnetically controlled roll shape. This invention proposes two typical electromagnetic bar layout methods for multi-segment rolls with electromagnetically controlled shapes, and provides a detailed and reliable method for multi-segment roll shape joint control. Focusing on multi-segment joint control of roll shape electromagnetic control technology, this invention proposes a universally applicable roll shape control method and provides a detailed control process.

[0161] like Figure 9 As shown, this embodiment of the invention provides a multi-segment joint control device 900 for electromagnetically controlled rolls. This device 900 is used to implement a multi-segment joint control method for electromagnetically controlled rolls. The device 900 includes:

[0162] The parameter control module 910 is used to control the parameters of m groups of electromagnetic rods in the electromagnetic control roll to be controlled.

[0163] The electromagnetic rod control module 920 is used for strip rolling based on the electromagnetic control roll after parameter adjustment, to obtain the strip shape data after rolling, to determine the electromagnetic rod to be controlled, and to control the roll gap shape of the electromagnetic rod to be controlled.

[0164] The cooling control module 930 is used to acquire the electromagnetic rods that need to be subjected to external segmental cooling and to apply external segmental cooling to them.

[0165] The roller shape preset module 940 is used to preset the roller shape for electromagnetic control of m groups of electromagnetic rods and to obtain the undetermined coefficients of m groups of electromagnetic rods.

[0166] The parameter matching module 950 is used to perform parameter matching on m groups of electromagnetic rods based on undetermined coefficients to obtain the actual control parameter matrix of m groups of electromagnetic rods.

[0167] The joint control module 960 is used to complete the joint control of multiple sections of the electromagnetic control roll to be controlled based on the actual control parameter matrix.

[0168] Optionally, the parameters include current input parameter I0, current frequency parameter f0, control temperature parameter T0, and temperature control mode.

[0169] The temperature control modes include continuous temperature control mode and periodic heating mode.

[0170] Optionally, electromagnetic control rolls are arranged on both sides of the strip on the strip mill, and an inlet side strip shape meter and an inlet side strip thickness meter are arranged on the inlet side of the strip mill, and an outlet side strip shape meter and an outlet side strip thickness meter are arranged on the outlet side of the strip mill.

[0171] Each of the m groups of electromagnetic rods corresponds to n / m control sections, and each group of electromagnetic rods is located at the center of its corresponding control section. The n control sections corresponding to the m groups of electromagnetic rods constitute the control zone. The inlet side plate shape meter and the inlet side plate thickness meter are used to obtain the inlet side plate shape data of the n control sections, and the outlet side plate shape meter and the outlet side plate thickness meter are used to obtain the outlet side plate shape data of the n control sections.

[0172] Optionally, the electromagnetic rod control module 920 is further used for:

[0173] S21. Obtain the plate shape data of n control sections after rolling, compare the plate shape data with the preset plate shape problem detection standard, and obtain one or more plate shape defect control sections.

[0174] S22. Based on one or more plate shape defect control sections, obtain one or more plate shape defect electromagnetic rods corresponding to the plate shape defect control sections.

[0175] S23. For each plate-shaped defect electromagnetic rod, pre-open the plate-shaped defect electromagnetic rod and acquire the detection data f from the inlet side plate thickness gauge. en (x) and the test data f from the outlet side plate thickness gauge ex (x), where x is the coordinate of the strip width.

[0176] S24. Based on the detection data f en (x) and f ex (x) Calculate the roll gap shape function, calculate the minimum roll gap opening based on the roll gap shape function, and calculate the roll gap shape deviation function based on the minimum roll gap opening.

[0177] S25. Determine whether there is a maximum value in the plate shape defect control section according to the roll gap shape deviation function, obtain the plate shape defect control section with the maximum value, and set the electromagnetic rod corresponding to the plate shape defect control section to the state to be controlled.

[0178] Optionally, the cooling control module 930 is further used for:

[0179] Based on the axial offset δ between the center position of the electromagnetic rod to be controlled and the maximum value of the plate defect control section, it is determined whether the electromagnetic rod to be controlled needs to be subjected to external segmented cooling. If δ is less than or equal to the preset electromagnetic rod contact area length, the electromagnetic rod to be controlled does not need to be subjected to external segmented cooling; if δ is greater than the preset electromagnetic rod contact area length, the electromagnetic rod to be controlled needs to be subjected to external segmented cooling.

[0180] Optionally, the roller shape preset module 940 is further used for:

[0181] S41. Select one group of electromagnetic rods from the m groups in sequence, and obtain the roller shape of the electromagnetic rod and the electromagnetic rods on the adjacent sides of the electromagnetic rod respectively.

[0182] S42. Transfer the roll shape to the roll shape coordinate system of the electromagnetic control roll, and set the electromagnetic rod and the center position of the electromagnetic rod on both sides of the electromagnetic rod.

[0183] S43. Extract the roll gap shape deviation function of the control section formed by the electromagnetic rod and the electromagnetic rods on both sides adjacent to the electromagnetic rod, and convert the axial coordinate of the roll gap shape deviation function into a new coordinate centered on the midpoint of the control section formed.

[0184] S44. Randomly select 12 non-overlapping coordinate points (x) within the formed control zone. N1 ,y N1 ) to (x N12 ,y N12 ).

[0185] S45. The obtained electromagnetic rod and the roller shapes of the electromagnetic rods on both sides adjacent to the electromagnetic rod are superimposed according to their spatial positions to obtain the joint control roller shape of the control section. The joint control roller shape is then made to approximate y at 12 selected non-overlapping coordinate points. N1 To y N12 And obtain the undetermined coefficients.

[0186] S46. Randomly select 3 non-overlapping coordinate points within the formed control zone. The selected coordinate points do not overlap with the 12 coordinate points selected in step S44.

[0187] S47. Verify the shape of the control roller based on the three selected coordinate points. If the verification is successful, proceed to preset the roller shape of the next set of electromagnetic rods. If the verification fails, solve for the undetermined coefficients again and proceed to execute S44.

[0188] Optionally, the parameter matching module 950 is further used for:

[0189] S51. Based on the undetermined coefficient matrix of m groups of electromagnetic rods and the control capability of the basic components of the electromagnetically controlled roll - basic temperature rise power P w The database performs parameter matching on m groups of electromagnetic rods to obtain the control parameter matrix of m groups of electromagnetic rods.

[0190] S52. Based on the control parameter matrix of m sets of electromagnetic rods, the axial characteristic coefficient of the electromagnetic rods, the radial characteristic coefficient of the electromagnetic rods, and the preset electromagnetic control roll heat exchange power, calculate the actual control parameter matrix of m sets of electromagnetic rods.

[0191] This invention provides a method and apparatus for multi-segment joint control of electromagnetically controlled rolls. This method allows for multi-segment roll shape presetting and parameter matching of electromagnetically controlled rolls equipped with various types of electromagnetic bars, and provides feedback adjustments based on online detection data, thereby ensuring the stability of the electromagnetically controlled roll shape. This invention proposes two typical electromagnetic bar layout methods for multi-segment rolls with electromagnetically controlled shapes, and provides a detailed and reliable method for multi-segment roll shape joint control. Focusing on multi-segment joint control of roll shape electromagnetic control technology, this invention proposes a universally applicable roll shape control method and provides a detailed control process.

[0192] Figure 10This is a schematic diagram of the structure of an electronic device 1000 provided in an embodiment of the present invention. The electronic device 1000 can vary considerably due to differences in configuration or performance. It may include one or more central processing units (CPUs) 1001 and one or more memories 1002. The memory 1002 stores at least one instruction, which is loaded and executed by the processor 1001 to implement the following electromagnetic control roll multi-segment joint control method:

[0193] S1. Adjust the parameters of m groups of electromagnetic rods in the electromagnetic control roll to be controlled.

[0194] S2. Based on the parameter-controlled electromagnetic control roll, strip rolling is performed, the strip shape data after rolling is obtained, the electromagnetic bar to be controlled is determined, and the roll gap shape is controlled by adjusting the electromagnetic bar to be controlled.

[0195] S3. Obtain the electromagnetic rod that needs to be externally cooled in the electromagnetic rod to be controlled, and apply external cooling in the electromagnetic rod.

[0196] S4. Perform electromagnetic control roller shape preset for m groups of electromagnetic rods and obtain the undetermined coefficients of m groups of electromagnetic rods.

[0197] S5. Perform parameter matching on m groups of electromagnetic rods based on the undetermined coefficients to obtain the actual control parameter matrix of m groups of electromagnetic rods.

[0198] S6. Based on the actual control parameter matrix, complete the multi-segment joint control of the electromagnetic control roll to be controlled.

[0199] In an exemplary embodiment, a computer-readable storage medium is also provided, such as a memory including instructions that can be executed by a processor in a terminal to complete the above-described electromagnetically controlled multi-segment joint control method for rolls. For example, the computer-readable storage medium may be a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, or optical data storage device.

[0200] Those skilled in the art will understand that all or part of the steps of the above embodiments can be implemented by hardware or by a program instructing related hardware. The program can be stored in a computer-readable storage medium, such as a read-only memory, a disk, or an optical disk.

[0201] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for multi-segment joint control of electromagnetically controlled rolls, characterized in that, The method includes: S1. Adjust the parameters of m groups of electromagnetic rods in the electromagnetically controlled roll to be controlled. S2. Based on the parameter-controlled electromagnetic control roll, strip rolling is performed, the strip shape data after rolling is obtained, the electromagnetic bar to be controlled is determined, and the roll gap shape is controlled by the electromagnetic bar to be controlled. S3. Obtain the electromagnetic rods that need to be subjected to external segmental cooling from the electromagnetic rods to be controlled, and apply external segmental cooling. S4. Perform electromagnetic control roller shape preset on the m groups of electromagnetic rods and obtain the undetermined coefficients of the m groups of electromagnetic rods. S5. Perform parameter matching on the m groups of electromagnetic rods according to the undetermined coefficients to obtain the actual control parameter matrix of the m groups of electromagnetic rods. S6. Based on the actual control parameter matrix, complete the multi-segment joint control of the electromagnetic control roll to be controlled.

2. The method according to claim 1, characterized in that, The parameters in S1 include current input parameter I0, current frequency parameter f0, control temperature parameter T0, and temperature control mode. The temperature control modes include continuous temperature control mode and periodic heating mode.

3. The method according to claim 1, characterized in that, The electromagnetic control rolls are arranged on both sides of the strip on the strip mill. The strip mill is equipped with an inlet side strip shape meter and an inlet side strip thickness meter on the inlet side, and an outlet side strip shape meter and an outlet side strip thickness meter on the outlet side. Each of the m groups of electromagnetic rods corresponds to n / m control sections, and each group of electromagnetic rods is located at the center of the corresponding control section. The n control sections corresponding to the m groups of electromagnetic rods constitute the control area. The inlet side plate shape meter and the inlet side plate thickness meter are used to obtain the inlet side plate shape data of the n control sections. The outlet side plate shape meter and the outlet side plate thickness meter are used to obtain the outlet side plate shape data of the n control sections.

4. The method according to claim 1, characterized in that, The step S2, which involves acquiring the rolled plate shape data and determining the electromagnetic rod to be controlled, includes: S21. Obtain the plate shape data of n control sections after rolling, compare the plate shape data with the preset plate shape problem detection standard, and obtain one or more plate shape defect control sections. S22. Based on the one or more plate shape defect control sections, obtain one or more plate shape defect electromagnetic rods corresponding to the plate shape defect control sections; S23. For each plate-shaped defect electromagnetic rod, pre-activate the plate-shaped defect electromagnetic rod and acquire the detection data f from the inlet side plate thickness gauge. en (x) and the test data f from the outlet side plate thickness gauge ex (x), where x is the coordinate of the strip width; S24. Based on the detection data f en (x) and f ex (x) Calculate the roll gap shape function, calculate the minimum roll gap opening based on the roll gap shape function, and calculate the roll gap shape deviation function based on the minimum roll gap opening; S25. Determine whether there is a maximum value in the plate shape defect control section according to the roller gap shape deviation function, obtain the plate shape defect control section with the maximum value, and set the electromagnetic rod corresponding to the plate shape defect control section to the state to be controlled.

5. The method according to claim 1, characterized in that, The step S3 involves obtaining the electromagnetic rods that require external segmented cooling from the electromagnetic rods to be controlled, and applying external segmented cooling, including: Based on the axial offset δ between the center position of the electromagnetic rod to be controlled and the maximum value of the plate defect control section, it is determined whether the electromagnetic rod to be controlled needs to be subjected to external segmented cooling. If δ is less than or equal to the preset electromagnetic rod contact area length, the electromagnetic rod to be controlled does not need to be subjected to external segmented cooling; if δ is greater than the preset electromagnetic rod contact area length, the electromagnetic rod to be controlled needs to be subjected to external segmented cooling.

6. The method according to claim 1, characterized in that, The step S4, which involves electromagnetically controlling the roller shape of the m groups of electromagnetic rods and obtaining the undetermined coefficients of the m groups of electromagnetic rods, includes: S41. Select one group of electromagnetic rods from the m groups of electromagnetic rods in sequence, and obtain the roller shape of the electromagnetic rod and the electromagnetic rods on the adjacent sides of the electromagnetic rod respectively. S42. Transfer the roller shape to the roller shape coordinate system of the electromagnetic control roller, and configure the electromagnetic rod and the center position of the electromagnetic rod on both sides adjacent to the electromagnetic rod. S43. Extract the roll gap shape deviation function of the control section formed by the electromagnetic rod and the electromagnetic rods on both sides adjacent to the electromagnetic rod, and convert the axial coordinate of the roll gap shape deviation function into a new coordinate centered on the midpoint of the control section formed. S44. Randomly select 12 non-overlapping coordinate points (x) within the formed control zone. N1 ,y N1 ) to (x N12 ,y N12 ); S45. The obtained electromagnetic rod and the roller shapes of the electromagnetic rods on both sides adjacent to the electromagnetic rod are superimposed according to their spatial positions to obtain the joint control roller shape of the control section. The joint control roller shape is made to approximate y at 12 selected non-overlapping coordinate points. N1 To y N12 And obtain the undetermined coefficients; S46. Randomly select 3 non-overlapping coordinate points within the constructed control zone. The selected coordinate points do not overlap with the 12 coordinate points selected in step S44. S47. Verify the shape of the control roller based on the three selected coordinate points. If the verification is successful, proceed to preset the roller shape of the next set of electromagnetic rods. If the verification fails, solve for the undetermined coefficients again and proceed to S44.

7. The method according to claim 1, characterized in that, In step S5, parameter matching of the m groups of electromagnetic rods is performed based on the undetermined coefficients to obtain the actual control parameter matrix of the m groups of electromagnetic rods, including: S51. Based on the undetermined coefficient matrix of m groups of electromagnetic rods and the control capability of the basic components of the electromagnetically controlled roll - basic temperature rise power P w The database performs parameter matching on m groups of electromagnetic rods to obtain the control parameter matrix of m groups of electromagnetic rods; S52. Calculate the actual control parameter matrix of the m sets of electromagnetic rods based on the control parameter matrix of the m sets of electromagnetic rods, the axial characteristic coefficient of the electromagnetic rods, the radial characteristic coefficient of the electromagnetic rods, and the preset electromagnetic control roll heat exchange power.

8. A multi-segment combined control device for electromagnetically controlled rolling mill rolls, characterized in that, The device includes: The parameter control module is used to control the parameters of m groups of electromagnetic rods in the electromagnetic control roll to be controlled. The electromagnetic rod control module is used to roll strip based on the electromagnetic control roll after parameter adjustment, obtain the strip shape data after rolling, determine the electromagnetic rod to be controlled, and control the roll gap shape of the electromagnetic rod to be controlled. The cooling control module is used to identify the electromagnetic rods that need to be subjected to external segmental cooling among the electromagnetic rods to be controlled, and to apply external segmental cooling to them. The roller shape preset module is used to preset the roller shape for electromagnetic control of the m groups of electromagnetic rods and to obtain the undetermined coefficients of the m groups of electromagnetic rods. The parameter matching module is used to match the parameters of the m groups of electromagnetic rods according to the undetermined coefficients to obtain the actual control parameter matrix of the m groups of electromagnetic rods. The joint control module is used to complete the joint control of multiple sections of the electromagnetic control roll to be controlled based on the actual control parameter matrix.

9. The apparatus according to claim 8, characterized in that, The electromagnetic rod control module is further used for: S21. Obtain the plate shape data of n control sections after rolling, compare the plate shape data with the preset plate shape problem detection standard, and obtain one or more plate shape defect control sections. S22. Based on the one or more plate shape defect control sections, obtain one or more plate shape defect electromagnetic rods corresponding to the plate shape defect control sections; S23. For each plate-shaped defect electromagnetic rod, pre-activate the plate-shaped defect electromagnetic rod and acquire the detection data f from the inlet side plate thickness gauge. en (x) and the test data f from the outlet side plate thickness gauge ex (x), where x is the coordinate of the strip width; S24. Based on the detection data f en (x) and f ex (x) Calculate the roll gap shape function, calculate the minimum roll gap opening based on the roll gap shape function, and calculate the roll gap shape deviation function based on the minimum roll gap opening; S25. Determine whether there is a maximum value in the plate shape defect control section according to the roller gap shape deviation function, obtain the plate shape defect control section with the maximum value, and set the electromagnetic rod corresponding to the plate shape defect control section to the state to be controlled.

10. The apparatus according to claim 8, characterized in that, The cooling control module is further used for: Based on the axial offset δ between the center position of the electromagnetic rod to be controlled and the maximum value of the plate defect control section, it is determined whether the electromagnetic rod to be controlled needs to be subjected to external segmented cooling. If δ is less than or equal to the preset electromagnetic rod contact area length, the electromagnetic rod to be controlled does not need to be subjected to external segmented cooling; if δ is greater than the preset electromagnetic rod contact area length, the electromagnetic rod to be controlled needs to be subjected to external segmented cooling.

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