Method and device for optimizing plane shape of medium-thickness plate based on variable-thickness rolling

Abstract

The invention provides a method and device for optimizing the plane shape of a medium-thickness plate based on variable-thickness rolling, and the method comprises the steps: calculating the plane shape change of a rolled piece according to the size data of the rolled piece and a specific rolling process procedure, and determining a thickness compensation curve of a variable-thickness rolling pass according to the non-uniform deformation of the plane shape, theoretical support and technical guidance are provided for the medium-thickness plate online rolling control technology, the plane shape control precision and the rectangularization rate of finished products are effectively improved, the applicability is high, the debugging cost and the optimization difficulty are reduced, and the energy utilization rate and the product yield are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of steel rolling, and in particular to a method and device for optimizing the plane shape of a medium and thick plate based on variable thickness rolling. Background Art

[0002] Steel production is an energy-intensive industry. To ensure sustainable development and reduce energy loss, steel companies have researched and developed advanced rolling technologies and processes, achieving a highly efficient steel production process centered on continuous production, accelerated production pace, and improved production efficiency. In medium and heavy plate production, improving the yield rate of finished products is an effective way to conserve energy, reduce production costs, and improve economic benefits. Plane shape control technology is a key method used in medium and heavy plate production lines to control the rectangularity of finished products, reduce head, tail, and edge shear losses, and improve yield rates. This technology leverages the principle of volume invariance to convert the volume of irregular shapes after rolling into thickness adjustments for intermediate passes, compensating for uneven deformation and eliminating shape deviations. In recent years, steel companies have conducted in-depth research on plane shape control methods and developed a variety of online rolling control technologies, successfully improving yield rates. However, current industrial applications of plane shape control technology for medium and heavy plate still face challenges, including low accuracy of the plane shape control model algorithm; a disconnect between theoretical research results and actual production; and insufficient equipment requirements.

[0003] In the related art, one method is to perform variable thickness rolling on the rolled piece during the widening rolling stage and the forming rolling stage. However, due to the relatively simple rolling control method, the thickness curve setting accuracy is not high, and the accurate plane shape optimization effect cannot be achieved. In addition, the method depends on specific rolling procedures, material dimensions or equipment conditions, and the control method is not very applicable. Another method is to increase the number of rolling control points to improve the plane shape control accuracy of medium and thick plates. However, the rolling control technology of medium and thick plate production lines relies on high-precision, high-response speed hydraulic automatic generator control systems (Automatic The use of an AGC (Gauge Control) system and position tracking device with too many set points can lead to equipment control difficulties, preventing the theoretical control accuracy from being achieved and reducing the ability to adjust the planar shape. Another approach is to modify the medium and heavy plate rolling strategy and control methods to improve the planar shape of specific slab sizes, steel grades, and finished product specifications, thereby increasing product yield. However, the rolling strategy used in this technology is an empirical solution derived from field measurements, which is highly targeted and has unknown applicability to non-similar steel grades, slab sizes, and complex rolling processes. This type of technology has poor theoretical basis and high subsequent debugging costs and optimization difficulties. Another approach is to use image recognition to obtain the planar profile curve of the rolled piece in real time during the rolling process, thereby adjusting the planar shape control parameters. However, this type of technology does not establish a direct relationship between the planar profile curve and the rolling control parameters, and cannot directly derive parameter adjustment methods based on the uneven deformation of the rolled piece during the rolling process. This requires extensive manual testing and product consumption, reducing energy utilization and product yield. Summary of the Invention

[0004] One object of the present invention is to provide a method for optimizing the plane shape of medium and thick plates based on variable thickness rolling. According to the dimensional data of the rolled piece and the specific rolling process regulations, the planar shape change of the rolled piece after rolling is calculated, and the thickness compensation curve of the variable thickness rolling pass is determined according to the uneven deformation of the planar shape, so as to provide theoretical support and technical guidance for the online rolling control technology of medium and thick plates, effectively improve the plane shape control accuracy and the rectangularization rate of the finished product, have high applicability, reduce debugging costs and optimization difficulty, and improve energy utilization and product yield. Another object of the present invention is to provide a device for optimizing the plane shape of medium and thick plates based on variable thickness rolling. Another object of the present invention is to provide a computer-readable medium. Still another object of the present invention is to provide a computer device.

[0005] In order to achieve the above objectives, the present invention discloses, on one hand, a method for optimizing the plane shape of a medium and thick plate based on variable thickness rolling, comprising:

[0006] Obtaining the initial size of the rolled piece, material properties, and rolling mill parameters. The initial size of the rolled piece includes the initial width and initial length of the rolled piece.

[0007] Decomposing the rolled piece into multiple metal bars according to the initial width and initial length of the rolled piece;

[0008] Rolling a plurality of metal bars according to the initial dimensions of the rolled piece, material properties, rolling mill parameters, input rolling process parameters, and initial dimensions of each metal bar to generate a volume to be compensated for each metal bar after rolling, wherein the initial dimensions of each metal bar include an initial thickness of each metal bar;

[0009] Determine the variable thickness rolling control curve based on the volume to be compensated and the initial size of each metal bar;

[0010] Generate control parameters for each rolling section based on the control point setting method of MAS rolling technology and variable thickness rolling control curve;

[0011] According to the control parameters of each rolling section, the initial thickness of each metal strip is adjusted to obtain the thickness distribution of the slab after variable thickness rolling optimization.

[0012] Preferably, the initial size of the rolled piece also includes: the initial thickness of the rolled piece;

[0013] Material properties include: elastic modulus of rolled piece, Poisson’s ratio and material yield strength;

[0014] The rolling mill parameters include: roughing mill roll radius, roughing mill roll elastic modulus, roughing mill roll Poisson's ratio, roughing mill friction coefficient, finishing mill roll radius, finishing mill roll elastic modulus, finishing mill roll Poisson's ratio and finishing mill friction coefficient.

[0015] Preferably, the method further comprises:

[0016] The imported rolling schedule is parsed to generate rolling process parameters.

[0017] Preferably, the rolling process parameters include mill type number, exit roll gap, bite speed, roll speed, rolling force and rolling temperature.

[0018] Preferably, the rolled piece is decomposed into a plurality of metal bars according to the initial width and initial length of the rolled piece, including:

[0019] According to the initial width and initial length of the rolled piece, the rolled piece is decomposed along the width direction to obtain multiple metal bars.

[0020] Preferably, the plurality of metal bars are rolled according to the initial size of the rolled piece, the material properties, the rolling mill parameters, the input rolling process parameters and the initial size of each metal bar, and the volume to be compensated of each metal bar after rolling is generated, including:

[0021] According to the initial size of the rolled piece, material properties, rolling mill parameters, rolling process parameters and the initial size of each metal bar, multiple metal bars are rolled to generate the uneven deformation of the head and tail of the rolled piece and the size of the metal bar after rolling;

[0022] According to the uneven deformation of the head and tail of the rolled piece and the size of the metal bar after rolling, the volume to be compensated of each metal bar after rolling is generated.

[0023] Preferably, the plurality of metal bars are rolled according to the initial size of the rolled piece, material properties, rolling mill parameters, rolling process parameters and initial size of each metal bar to generate the uneven deformation of the head and tail of the rolled piece and the size of the metal bar after rolling, including:

[0024] Applying the bar segmentation method, according to the initial size of the rolled piece, material properties, rolling mill parameters and rolling process parameters, each metal bar is rolled in the current rolling pass to obtain the intermediate size after the current rolling pass;

[0025] According to the middle size of each metal bar, the uneven deformation of the head and tail of the rolled piece after the current rolling pass is generated;

[0026] The intermediate size is used as the initial size of the next rolling pass, the next rolling pass is used as the current rolling pass, and the strip segmentation method is repeatedly applied to each metal strip according to the initial size of the rolled piece, the material properties, the rolling mill parameters and the rolling process parameters, to obtain the intermediate size after the current rolling pass, until there is no next rolling pass, and the size of the metal strip after rolling is obtained;

[0027] The uneven deformation of the head and tail of the rolled piece after each rolling pass is superimposed accordingly to generate the uneven deformation of the head and tail of the rolled piece after rolling.

[0028] Preferably, the volume to be compensated of each metal bar after rolling is generated according to the uneven deformation of the head and tail of the rolled piece and the size of the metal bar after rolling, including:

[0029] The uneven deformation of the head and tail of the rolled piece is added together to generate the total uneven deformation of each metal strip;

[0030] According to the total amount of uneven deformation and the size of the metal bar after rolling, the volume to be compensated of each metal bar after rolling is generated.

[0031] Preferably, the variable thickness rolling control curve is determined according to the volume to be compensated and the initial size of each metal bar, including:

[0032] According to the volume invariance principle, the volume to be compensated is converted into the corresponding initial thickness adjustment of the metal strip;

[0033] The variable thickness rolling control curve is drawn by adjusting the initial thickness of each metal bar and the corresponding metal bar.

[0034] Preferably, the control parameters of each rolling section are generated according to the control point setting method of the MAS rolling technology and the variable thickness rolling control curve, including:

[0035] According to the control point setting method of MAS rolling technology and the variable thickness rolling control curve, the initial thickness control node is optimized to generate the model setting curve;

[0036] The control parameters of each rolling section are determined by setting the curve through the model.

[0037] Preferably, the initial thickness of each metal bar is adjusted according to the control parameters of each rolling section to obtain the slab thickness distribution after variable thickness rolling optimization, including:

[0038] According to the control parameters of each rolling section, the actual thickness adjustment of each metal strip is determined;

[0039] The actual thickness adjustment of each metal bar is superimposed on the initial thickness of the corresponding metal bar to generate the slab thickness distribution after variable thickness rolling optimization.

[0040] Preferably, after adjusting the initial thickness of each metal bar according to the control parameters of each rolling section to obtain the slab thickness distribution after variable thickness rolling optimization, the method further includes:

[0041] According to the initial size of the rolled piece, material properties, rolling mill parameters, input rolling process parameters and the slab thickness distribution after variable thickness rolling optimization, multiple metal bars are rolled to generate the optimized volume compensation amount of each metal bar after rolling;

[0042] Optimization verification is performed based on the volume to be compensated after optimization and the volume to be compensated before optimization, and a plane shape optimization capability verification result is generated.

[0043] The present invention also discloses a medium and thick plate plane shape optimization device based on variable thickness rolling, comprising:

[0044] An acquisition unit is used to acquire the initial size of the rolled piece, material properties and rolling mill parameters, where the initial size of the rolled piece includes the initial width and initial length of the rolled piece;

[0045] A decomposition unit, used for decomposing the rolled piece into a plurality of metal strips according to the initial width and initial length of the rolled piece;

[0046] A rolling unit is used to roll a plurality of metal bars according to the initial dimensions of the rolled piece, material properties, rolling mill parameters, input rolling process parameters, and initial dimensions of each metal bar, and generate a volume to be compensated for each metal bar after rolling, wherein the initial dimensions of each metal bar include an initial thickness of each metal bar;

[0047] A variable thickness rolling control curve determination unit is used to determine the variable thickness rolling control curve according to the volume to be compensated and the initial size of each metal bar;

[0048] A control parameter generating unit, for generating control parameters for each rolling section according to the control point setting method of the MAS rolling technology and the variable thickness rolling control curve;

[0049] The shape optimization unit is used to adjust the initial thickness of each metal strip according to the control parameters of each rolling section to obtain the thickness distribution of the slab after variable thickness rolling optimization.

[0050] The present invention also discloses a computer-readable medium on which a computer program is stored. When the program is executed by a processor, the method described above is implemented.

[0051] The present invention also discloses a computer device, including a memory and a processor, wherein the memory is used to store information including program instructions, the processor is used to control the execution of program instructions, and the processor implements the above method when executing the program.

[0052] The present invention also discloses a computer program product, comprising a computer program / instruction, which implements the above method when the computer program / instruction is executed by a processor.

[0053] The present invention obtains the initial size of the rolled piece, material properties and rolling mill parameters, wherein the initial size of the rolled piece includes the initial width of the rolled piece and the initial length of the rolled piece; decomposes the rolled piece into multiple metal bars according to the initial width and the initial length of the rolled piece; rolls the multiple metal bars according to the initial size of the rolled piece, material properties, rolling mill parameters, input rolling process parameters and the initial size of each metal bar, and generates the volume to be compensated of each metal bar after rolling; determines the variable thickness rolling control curve according to the volume to be compensated and the initial size of each metal bar; generates the variable thickness rolling control curve according to the control point setting method of the MAS rolling technology and the variable thickness rolling control curve. The control parameters of each rolling section are obtained; according to the control parameters of each rolling section, the initial thickness of each metal strip is adjusted to obtain the thickness distribution of the slab after variable thickness rolling optimization; according to the size data of the rolled piece and the specific rolling process regulations, the plane shape change of the rolled piece after rolling is calculated, and the thickness compensation curve of the variable thickness rolling pass is determined according to the uneven deformation of the plane shape, which provides theoretical support and technical guidance for the online rolling control technology of medium and thick plates, effectively improves the plane shape control accuracy and the rectangular rate of the finished product, has high applicability, reduces the debugging cost and optimization difficulty, and improves the energy utilization rate and product yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0055] Figure 1 A flow chart of a method for optimizing the plane shape of a medium and thick plate based on variable thickness rolling provided by an embodiment of the present invention;

[0056] Figure 2 A flow chart of another method for optimizing the plane shape of a medium and thick plate based on variable thickness rolling provided by an embodiment of the present invention;

[0057] Figure 3 A schematic diagram of the distribution of multiple metal bars before rolling of a rolled piece provided by an embodiment of the present invention;

[0058] Figure 4 A schematic diagram of the distribution of multiple metal bars after rolling a rolled piece provided by an embodiment of the present invention;

[0059] Figure 5 A schematic plan view of a volume to be compensated for a rolled metal bar provided in an embodiment of the present invention;

[0060] Figure 6 A schematic diagram of a variable thickness rolling control curve provided by an embodiment of the present invention;

[0061] Figure 7 A schematic diagram of a curve of a 7-point setting method for a MAS rolling technology provided by an embodiment of the present invention;

[0062] Figure 8 A schematic diagram of a MAS rolling setting curve according to a specific example provided in an embodiment of the present invention;

[0063] Figure 9 A schematic diagram of a total cutting loss curve of a rolled piece after MAS rolling optimization provided by an embodiment of the present invention;

[0064] Figure 10 A schematic structural diagram of a medium and thick plate plane shape optimization device based on variable thickness rolling provided by an embodiment of the present invention;

[0065] Figure 11 A schematic structural diagram of a computer device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0066] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0067] It should be noted that the method and device for optimizing the plane shape of medium and thick plates based on variable thickness rolling disclosed in the present application can be used in the field of artificial intelligence technology, and can also be used in any field other than the field of artificial intelligence technology. The application field of the method and device for optimizing the plane shape of medium and thick plates based on variable thickness rolling disclosed in the present application is not limited.

[0068] In order to facilitate the understanding of the technical solution provided by this application, the relevant contents of the technical solution of this application are first explained below. The automatic plan view pattern rolling system (Mizushima Automatic Plan View Pattern Control System, abbreviated as: MAS) rolling control technology is currently widely used in medium and thick plate mills due to its easy-to-use control method and equipment requirements. This technology first quantitatively predicts the planar shape of the finished rolled piece, and then performs variable thickness rolling on the rolled piece in the final pass of the forming stage and the widening stage to improve the rectangularity of the finished product. Traditional MAS rolling adopts a 7-point setting method. The setting points are mainly determined by finite element simulation combined with data regression or directly based on actual production experience. The control curve setting is simple, the closeness to the theoretical compensation value is low, and the control accuracy is poor. At the same time, the MAS rolling control model used on site is not very applicable. It is still unable to effectively control the planar shape of rolled pieces under multiple types of steel, multiple finished product sizes and complex rolling procedures. Therefore, it is very necessary to develop a set of high-precision planar shape control models that meet equipment conditions according to actual process requirements.

[0069] The following describes the implementation of the medium and thick plate planar shape optimization method based on variable thickness rolling, provided in an embodiment of the present invention, using a medium and thick plate planar shape optimization device based on variable thickness rolling as an example. It should be understood that the implementation of the medium and thick plate planar shape optimization method based on variable thickness rolling provided in an embodiment of the present invention includes, but is not limited to, the medium and thick plate planar shape optimization device based on variable thickness rolling.

[0070] Figure 1 A flow chart of a method for optimizing the plane shape of a medium and thick plate based on variable thickness rolling is provided in an embodiment of the present invention, as shown in FIG. Figure 1 As shown, the method includes:

[0071] Step 101: Obtain the initial size, material properties and rolling mill parameters of the rolled piece.

[0072] In the embodiment of the present invention, the initial size of the rolled piece includes but is not limited to the initial thickness of the rolled piece, the initial width of the rolled piece, and the initial length of the rolled piece.

[0073] Material properties include but are not limited to elastic modulus of rolled piece, Poisson's ratio, and material yield strength.

[0074] The rolling mill parameters include, but are not limited to, roughing mill roll radius, roughing mill roll elastic modulus, roughing mill roll Poisson's ratio, roughing mill friction coefficient, finishing mill roll radius, finishing mill roll elastic modulus, finishing mill roll Poisson's ratio and finishing mill friction coefficient.

[0075] In the embodiment of the present invention, the initial dimensions of the rolled piece, the material properties and the rolling mill parameters are used as the initial input of the high-precision plane shape control model of the present application, that is, the basic data for the calculation of the high-precision plane shape control model.

[0076] Step 102: Decompose the rolled piece into a plurality of metal bars according to the initial width and initial length of the rolled piece.

[0077] In the embodiment of the present invention, the rolled piece is decomposed into a plurality of metal strips according to the initial width and initial length of the rolled piece, which serve as basic calculation units of the high-precision plane shape control model.

[0078] Step 103: rolling the plurality of metal bars according to the initial size of the rolled piece, material properties, rolling mill parameters, input rolling process parameters and the initial size of each metal bar, and generating the volume to be compensated of each metal bar after rolling.

[0079] In the embodiment of the present invention, the rolling process parameters may be input by the user, or may be obtained by parsing a rolling schedule table imported by the user.

[0080] In this embodiment of the present invention, the initial dimensions of each metal bar include its initial thickness, initial length, and initial width. Specifically, the length, width, and thickness of each metal bar are calculated after all rolling passes, and the uneven deformation at the head and tail of the rolled piece is obtained by superimposing the individual passes. The volume loss of each metal bar after all rolling passes is calculated as the volume compensation required for each metal bar during the variable thickness rolling process.

[0081] Step 104: Determine a variable thickness rolling control curve based on the volume to be compensated and the initial size of each metal bar.

[0082] In the embodiment of the present invention, the volume to be compensated of the rolled bar is converted into a thickness adjustment amount of the initial thickness of the corresponding metal bar to determine the variable thickness rolling control curve.

[0083] Step 105: Generate control parameters for each rolling section according to the control point setting method of the MAS rolling technology and the variable thickness rolling control curve.

[0084] In the embodiment of the present invention, the control point setting method of the MAS rolling technology is a 7-point setting method. It is worth noting that the number of key points to be set can be set according to actual needs, and the embodiment of the present invention does not limit this.

[0085] Specifically, according to the 7-point setting method of MAS rolling technology and the variable thickness rolling control curve, the connection method of all thickness control nodes is traversed so that the error between the 6 connected line segments and the variable thickness rolling control curve reaches the minimum. This connection method is the model setting curve of MAS rolling technology; according to the model setting curve of MAS rolling technology, the setting parameters of the 7-point MAS rolling technology are determined.

[0086] Step 106: Adjust the initial thickness of each metal bar according to the control parameters of each rolling section to obtain the thickness distribution of the slab after variable thickness rolling optimization.

[0087] In the embodiment of the present invention, the initial thickness distribution of the metal strip thickness of the rolled piece is reset according to the control parameters of each rolling section, and the rolling process is repeated to verify the ability of the control point setting method of the MAS rolling technology to optimize the plane shape of medium and thick plates.

[0088] In the technical solution provided by the embodiment of the present invention, the initial size of the rolled piece, the material properties and the rolling mill parameters are obtained, and the initial size of the rolled piece includes the initial width and the initial length of the rolled piece; the rolled piece is decomposed into multiple metal bars according to the initial width and the initial length of the rolled piece; the multiple metal bars are rolled according to the initial size of the rolled piece, the material properties, the rolling mill parameters, the input rolling process parameters and the initial size of each metal bar, and the volume to be compensated of each metal bar after rolling is generated; according to the volume to be compensated and the initial size of each metal bar, the variable thickness rolling control curve is determined; according to the control point setting method of the MAS rolling technology and the variable thickness rolling control curve, the variable thickness rolling control curve is determined; according to the control point setting method of the MAS rolling technology and the variable thickness rolling control curve, the variable thickness rolling control curve is determined; according to the control point setting method of the MAS rolling technology and the variable thickness rolling control curve, the variable thickness rolling control curve is determined; according to the control point setting method of the MAS rolling technology and the variable thickness rolling control curve, the variable thickness rolling control curve is determined; Control curve is generated to generate control parameters for each rolling section; according to the control parameters of each rolling section, the initial thickness of each metal strip is adjusted to obtain the thickness distribution of the slab after variable thickness rolling optimization; according to the size data of the rolled piece and the specific rolling process regulations, the plane shape change of the rolled piece after rolling is calculated, and the thickness compensation curve of the variable thickness rolling pass is determined according to the uneven deformation of the plane shape, providing theoretical support and technical guidance for the online rolling control technology of medium and thick plates, effectively improving the plane shape control accuracy and the rectangular rate of the finished product, with high applicability, reducing the debugging cost and optimization difficulty, and improving energy utilization and product yield.

[0089] Figure 2 A flow chart of another method for optimizing the plane shape of a medium and thick plate based on variable thickness rolling provided in an embodiment of the present invention is shown in FIG. Figure 2 As shown, the method includes:

[0090] Step 201: Obtain the initial size, material properties and rolling mill parameters of the rolled piece.

[0091] In the embodiment of the present invention, each step is performed by a medium and thick plate plane shape optimization device based on variable thickness rolling.

[0092] In the embodiment of the present invention, the initial size of the rolled piece includes but is not limited to the initial thickness of the rolled piece, the initial width of the rolled piece, and the initial length of the rolled piece.

[0093] Material properties include but are not limited to elastic modulus of rolled piece, Poisson's ratio, and material yield strength.

[0094] The rolling mill parameters include, but are not limited to, roughing mill roll radius, roughing mill roll elastic modulus, roughing mill roll Poisson's ratio, roughing mill friction coefficient, finishing mill roll radius, finishing mill roll elastic modulus, finishing mill roll Poisson's ratio and finishing mill friction coefficient.

[0095] Step 202: parse the imported rolling schedule table to generate rolling process parameters.

[0096] In this embodiment of the present invention, the rolling process parameters for each rolling pass can be user-entered or generated by parsing a user-imported rolling schedule. These rolling process parameters include, but are not limited to, mill type number, exit roll gap, nip speed, roll speed, rolling force, and rolling temperature.

[0097] Step 203: Decompose the rolled piece along the width direction according to the initial width and initial length of the rolled piece to obtain a plurality of metal bars.

[0098] In the embodiment of the present invention, the rolled piece is decomposed into a number of metal strips along the width direction according to the initial width and initial length of the rolled piece. Due to symmetry, the number of metal strips is preferably set to an odd number. The initial size of each metal strip is determined. The initial size of the metal strip includes the initial thickness H0 of the metal strip, the initial width H0 of the metal strip, and the initial width H0 of the metal strip. Initial length of metal bar (i=1, 2, ..., n), n is the total number of metal bars.

[0099] Figure 3 A schematic diagram of the distribution of multiple metal bars before rolling of a rolled piece provided by an embodiment of the present invention is shown as follows: Figure 3 As shown, the rolled piece is decomposed into 7 metal strips (n=7) along the width direction. The initial width of the metal strip is The initial length of the metal bar is

[0100] Step 204: rolling the plurality of metal bars according to the initial size of the rolled piece, material properties, rolling mill parameters, rolling process parameters and initial size of each metal bar to generate the uneven deformation of the head and tail of the rolled piece and the rolled size of the metal bar.

[0101] In the embodiment of the present invention, step 204 specifically includes:

[0102] Step 2041: Apply the bar segmentation method to roll each metal bar in the current rolling pass according to the initial size of the rolled piece, material properties, rolling mill parameters and rolling process parameters to obtain the intermediate size after rolling in the current rolling pass.

[0103] Specifically, according to the initial size of the rolled piece, material properties, rolling mill parameters, and rolling process parameters, each metal bar is rolled in the current rolling pass to obtain the intermediate size after the current rolling pass. The intermediate size includes the length, width, and thickness of the metal bar.

[0104] Step 2042: Generate the uneven deformation of the head and tail of the rolled piece after the current rolling pass based on the intermediate dimensions of each metal bar.

[0105] In the embodiment of the present invention, the difference between the length of the intermediate dimension and the length of the initial dimension of each metal bar is determined as the total longitudinal extension of the metal bar after the current rolling pass.

[0106] Based on the stress distribution relationship and the total longitudinal extension in the rolling deformation zone, the longitudinal extension of the metal strip to the head and tail is calculated. Then, the uneven deformation at both ends of the rolled piece is obtained by the difference in the longitudinal extension of each strip. Specifically, the longitudinal unevenness of the head is calculated by the difference in the extension of the strip along the head; the uneven deformation of the tail is calculated by the difference in the uneven deformation of the strip along the tail. The uneven deformation obtained here is a relative value, which is the difference in the coordinates of each node (if the coordinates of the nodes of each strip are the same, the uneven deformation is zero, and the deformation is uniform).

[0107] Among them, the longitudinal extension of the head is:

[0108]

[0109] Where, Δl hi is the longitudinal extension of the head of the i-th metal strip; Δl i is the total longitudinal extension of the i-th metal bar after the current rolling pass; σ hi is the extension stress of the i-th metal strip element toward the head, which can be obtained by setting the lateral displacement function and the stress distribution in the rolling deformation zone; σ ti is the extension stress of the i-th metal strip element toward the tail, which can be obtained by setting the lateral displacement function and the stress distribution in the rolling deformation zone.

[0110] The longitudinal extension of the tail is:

[0111]

[0112] Where, Δl ti is the longitudinal extension of the tail of the i-th metal strip; Δli is the total longitudinal extension of the i-th metal bar after the current rolling pass; σ hi is the extension stress of the i-th metal strip element toward the head, which can be obtained by setting the lateral displacement function and the stress distribution in the rolling deformation zone; σ ti is the extension stress of the i-th metal strip element toward the tail, which can be obtained by setting the lateral displacement function and the stress distribution in the rolling deformation zone.

[0113] According to the length difference between the longitudinal extension of the head of each metal strip element after the current rolling pass and the longitudinal extension of the head of the metal strip element in the center of the plate width, the uneven deformation of the head of the rolled piece after the current rolling pass is determined; according to the length difference between the longitudinal extension of the tail of each metal strip element after the current rolling pass and the longitudinal extension of the tail of the metal strip element in the center of the plate width, the uneven deformation of the tail of the rolled piece after the current rolling pass is determined.

[0114] Step 2043: Use the intermediate size as the initial size of the next rolling pass, use the next rolling pass as the current rolling pass, and repeat step 2041 until there is no next rolling pass, thereby obtaining the post-rolling size of the metal bar.

[0115] Specifically, the intermediate size is used as the input of the initial size of the next rolling pass, the next rolling pass is used as the current rolling pass, and step 2041 is repeated for rolling until there is no next rolling pass. The uneven deformation of the head and tail of the rolled piece after each rolling pass and the post-rolling size of the metal bar after the last rolling pass are obtained.

[0116] Step 2044: Superimpose the uneven deformation amounts of the head and tail of the rolled piece after each rolling pass to generate the uneven deformation amounts of the head and tail of the rolled piece after rolling.

[0117] In the embodiment of the present invention, the uneven deformation amount of the head and tail of the rolled piece after rolling refers to the uneven deformation amount of the head and tail of the rolled piece after all rolling passes are completed.

[0118] Specifically, the uneven deformation of the head of the rolled piece after each rolling pass is added together to obtain the uneven deformation of the head of the rolled piece after rolling; the uneven deformation of the tail of the rolled piece after each rolling pass is added together to obtain the uneven deformation of the tail of the rolled piece after rolling.

[0119] Figure 4 A schematic diagram of the distribution of multiple metal bars after rolling of a rolled piece provided by an embodiment of the present invention is shown as follows: Figure 4 As shown, after p rolling passes, the initial width of the i-th metal bar is The initial length of the i-th metal strip is

[0120] Step 205: Generate the volume to be compensated of each metal bar after rolling according to the uneven deformation of the head and tail of the rolled piece and the size of the metal bar after rolling.

[0121] In the embodiment of the present invention, step 205 specifically includes:

[0122] Step 2051: Add the uneven deformation amounts of the head and tail of the rolled piece to generate the total uneven deformation amount of each metal bar.

[0123] Specifically, the uneven deformation amount of the head of the rolled piece after rolling is added to the uneven deformation amount of the tail of the rolled piece after rolling to generate the total uneven deformation amount of each metal strip.

[0124] Step 2052: Generate the volume to be compensated of each metal bar after rolling based on the total amount of uneven deformation and the size of the metal bar after rolling.

[0125] In the embodiment of the present invention, the total amount of uneven deformation is the total amount of deformation of each metal bar relative to the central bar after rolling, and the size of the metal bar after rolling includes the width after rolling and the thickness after rolling. The total amount of uneven deformation, width after rolling and thickness after rolling are calculated to generate the volume to be compensated for each metal bar after rolling. i is the volume of the i-th metal bar to be compensated, is the total amount of uneven deformation of the i-th metal strip, is the width of the i-th metal bar after rolling, H p is the thickness of the i-th metal bar after rolling.

[0126] Figure 5 A schematic plan view of a volume to be compensated for a rolled metal bar provided in an embodiment of the present invention is shown in FIG. Figure 5 As shown, the dotted part is the volume to be compensated of each metal strip element, which is displayed in a plane form; the rectangle is each metal strip element, the black circle is the midpoint of each metal strip element, and the black curve is the connecting line of the midpoints of each metal strip element; B p is the plate width after p rolling passes, is the total amount of uneven deformation of the i-th metal strip, is the width of the i-th metal bar after rolling.

[0127] Step 206: According to the volume invariance principle, the volume to be compensated is converted into the corresponding initial thickness adjustment amount of the metal strip.

[0128] In the embodiment of the present invention, according to the volume invariance principle, The volume of the metal bar to be compensated after rolling is converted into the corresponding initial thickness adjustment of the metal bar. i is the volume of the i-th metal bar to be compensated, is the total amount of uneven deformation of the i-th metal strip, is the width of the i-th metal bar after rolling, H p is the thickness of the i-th metal bar after rolling, Δh i is the initial thickness adjustment of the i-th metal strip, H0 is the initial thickness of the metal strip, is the initial width of the i-th metal strip.

[0129] Step 207: Draw a variable thickness rolling control curve for each metal bar and the corresponding initial thickness adjustment amount of the metal bar.

[0130] In the embodiment of the present invention, the thickness compensation amount corresponding to the midpoint of each metal bar is used as a thickness control node, and the thickness control nodes are connected to obtain a variable thickness rolling control curve. Figure 6 A schematic diagram of a variable thickness rolling control curve provided by an embodiment of the present invention is shown as follows: Figure 6 As shown, the dotted line is the horizontal line where the minimum thickness compensation is located, the black thick solid line is the variable thickness rolling control curve, the rectangle is each metal bar element, and the black dots are the thickness control nodes corresponding to each metal bar element. is the initial width of the i-th metal strip, H0 is the initial thickness of the metal strip, Δh i is the initial thickness adjustment of the i-th metal strip element, and B0 is the initial plate width.

[0131] In the embodiment of the present invention, the variable thickness rolling control curve provides a reference benchmark for the subsequent specific rolling control method.

[0132] Step 208: Optimize the initial thickness control nodes according to the control point setting method of the MAS rolling technology and the variable thickness rolling control curve to generate a model setting curve.

[0133] In the embodiment of the present invention, the control point setting method of the MAS rolling technology is a 7-point setting method. It is worth noting that the number of key points to be set can be set according to actual needs, and the embodiment of the present invention does not limit this.

[0134] Figure 7 A schematic diagram of a 7-point setting method for a MAS rolling technology provided by an embodiment of the present invention is shown in FIG. Figure 7As shown in the figure, the thickness variation during the entire rolling process is divided into six segments, and the variation characteristics of these stages are described by seven key points represented by black dots. The curve from key point 1 to key point 2 is the first segment, the curve from key point 2 to key point 3 is the second segment, the curve from key point 3 to key point 4 is the third segment, the curve from key point 4 to key point 5 is the fourth segment, the curve from key point 5 to key point 6 is the fifth segment, and the curve from key point 6 to key point 7 is the sixth segment. Because the curves are symmetrical along the plate width, only half of the plate width needs to be considered when setting the model parameters. B0 is the initial plate width, B1, B2, and B3 are the reduction widths of the first, second, and third segments, respectively, and d1, d2, and d3 are the reduction depths of the first, second, and third segments, respectively.

[0135] Specifically, the connection mode between the thickness control nodes of the variable thickness rolling control curve is traversed, and the number of thickness control nodes contained in each segment of the 7-point setting method is iteratively adjusted so that the sum of the squares of the errors between the 6 connected line segments and the variable thickness rolling control curve reaches the minimum, and the model setting curve is generated.

[0136] Step 209: Determine the control parameters of each rolling section through the model setting curve.

[0137] In this embodiment, the 7-point setting method is used as an example. The control parameters for the 7-point MAS method are determined based on the model setting curve for MAS rolling. Because the curve is symmetrical across the plate width, the model control parameters only need to consider half the plate width. The control parameters include the reduction width and reduction depth.

[0138] Specifically, the control parameters of the first, second and third sections are calculated using the following formula:

[0139]

[0140]

[0141] Among them, B1, B2, and B3 are the widths of the first, second, and third sections respectively; d1, d2, and d3 are the depths of the first, second, and third sections respectively; n1, n2, and n3 are the number of thickness control nodes of the first, second, and third sections respectively; is the initial width of the i-th metal strip; Δh i is the initial thickness adjustment of the i-th metal strip; is the initial thickness adjustment of the n1th metal strip; is the initial thickness adjustment of the n1+n2th metal strip; is the initial thickness adjustment of the n1+n2+n3th metal strip element.

[0142] Step 210: Determine the actual thickness adjustment amount of each metal bar according to the control parameters of each rolling section.

[0143] In this embodiment of the present invention, since the curve is symmetrical along the plate width, the control parameters for the sixth, fifth, and fourth segments are derived based on the control parameters for the first, second, and third segments. Specifically, the control parameters for the first segment are the same as those for the sixth segment, the control parameters for the fifth segment are the same as those for the fourth segment, and the control parameters for the third segment are the same as those for the fourth segment. The control parameters include the press width and press depth.

[0144] Specifically, the reduction depth of each rolling section is determined as the actual thickness adjustment amount of the metal strip corresponding to the thickness control node included in the corresponding rolling section.

[0145] Step 211: superimpose the actual thickness adjustment amount of each metal bar element with the initial thickness of the corresponding metal bar element to generate the thickness distribution of the slab after variable thickness rolling optimization.

[0146] In an embodiment of the present invention, the actual thickness adjustment amount of each metal bar is added to the initial thickness of the corresponding metal bar to generate the optimized thickness of the metal bar; based on the optimized thickness of all metal bars of the slab, the thickness distribution of the slab after variable thickness rolling optimization is obtained.

[0147] Step 212: rolling multiple metal bars according to the initial size of the rolled piece, material properties, rolling mill parameters, input rolling process parameters and the slab thickness distribution after variable thickness rolling optimization, to generate the optimized volume compensation amount of each metal bar after rolling.

[0148] In an embodiment of the present invention, based on the initial thickness distribution of the rolled piece composed of metal bars after optimized thickness, according to the initial size of the rolled piece, material properties, rolling mill parameters, input rolling process parameters and the slab thickness distribution after variable thickness rolling optimization, multiple optimized metal bars are rolled to generate the optimized volume compensation amount of each metal bar after rolling.

[0149] It is worth noting that the specific process is described in steps 202 to 205 and will not be repeated here.

[0150] Step 213 : Perform optimization verification based on the optimized volume to be compensated and the volume to be compensated before optimization, and generate a plane shape optimization capability verification result.

[0151] In an embodiment of the present invention, a volume optimization difference is generated based on the volume to be compensated after optimization and the volume to be compensated before optimization; if the volume optimization difference is less than a preset difference threshold, it indicates that the optimization verification is passed, and the plane shape optimization capability verification result that passes the optimization verification is determined; if the volume optimization difference is greater than the preset difference threshold, it indicates that the optimization verification fails, and the plane shape optimization capability verification result that fails the optimization verification is determined.

[0152] Furthermore, during the rolling process, the pressing depth of the rolling rollers is controlled and adjusted according to the pressing width and the moving speed of the medium and thick plate rolled piece.

[0153] It is worth noting that the difference threshold can be set according to actual needs, and the embodiment of the present invention does not limit this.

[0154] The following is a complete description of the implementation process of the medium and thick plate plane shape optimization method based on variable thickness rolling using a specific embodiment.

[0155] Step 1. Obtain the initial dimensions, material properties, and rolling mill parameters of the workpiece as input data for the model calculation. The initial dimensions include initial thickness, initial width, and initial length; the material properties include elastic modulus, Poisson's ratio, and yield strength; and the rolling mill parameters include the roughing mill roll radius, elastic modulus, Poisson's ratio, friction coefficient, finishing mill roll radius, elastic modulus, Poisson's ratio, and friction coefficient. In practical applications, the workpiece is a slab. Specific parameter values ​​are shown in Tables 1 and 2.

[0156] Table 1 Initial dimensions and material properties of slabs

[0157]

[0158] Table 2 Rolling mill parameters

[0159]

[0160] Step 2: Input the rolling process parameters for each rolling pass or directly import the rolling schedule table for analysis. This embodiment of the present invention uses a reciprocating rolling method, where the head and tail of the workpiece alternately enter the rolling mill. The rolling process parameters that need to be input include the mill type identifier, exit roll gap thickness, engagement speed, roll speed, rolling force, and rolling temperature. Specific parameters are shown in Table 3.

[0161] Table 3 Rolling schedule

[0162]

[0163] Step 3: To ensure symmetry, the embodiment of the present invention divides the rolled piece into 201 metal strips (n=201) evenly along the width direction. The initial width of each metal strip is The initial length is 11.79mm It is 3440 mm (i=1, 2, ..., 201), and the initial thickness is 218 mm.

[0164] Step 4: According to the rolling schedule, process parameters and the metal strip division method in step 3 in Table 3, calculate the uneven deformation of the head and tail of the rolled piece after all rolling passes. The maximum protrusion of the head is 328.25 mm, the maximum protrusion of the tail is 342.28 mm, and the total cutting loss is 39266 cm 3 (head + tail).

[0165] Step 5: According to the embodiment of the present invention, the total amount of uneven deformation (head + tail) of the rolled piece is calculated using the formula Calculate the initial thickness adjustment of each metal bar and determine the variable thickness rolling control curve of the rolled piece. is the total amount of uneven deformation of the i-th metal strip, is the width of the i-th metal bar after rolling, H p is the thickness of the i-th metal bar after rolling, Δh i is the initial thickness adjustment of the i-th metal strip, H0 is the initial thickness of the metal strip, is the initial width of the i-th metal strip.

[0166] Figure 8 A schematic diagram of a specific example MAS rolling setting curve provided in an embodiment of the present invention is shown as follows: Figure 8 As shown, the black solid line is the variable thickness rolling control curve; the horizontal axis is the plate width (m), with an interval of 0.5m; the vertical axis is the pressing depth (mm), with an interval of 1mm.

[0167] Step 6: According to the variable thickness rolling control curve of the embodiment of the present invention, traverse the connection mode of all thickness control nodes and find the optimal connection mode of 7 points that meets the conditions as the setting parameters of the MAS rolling control model. Figure 8 As shown in Figure 4, the black dotted line with black dots (thickness control nodes) is the 7-point setting curve for MAS rolling. Due to symmetry, the thickness control node at half the plate width is selected. The specific calculation results are shown in Table 4.

[0168] Table 4 MAS rolling 7-point setting parameters

[0169]

[0170] Step 7. According to the setting parameters of MAS rolling in Table 4, the thickness of the strips in each stage is linearly distributed, and the strip thickness adjustment amount based on the MAS rolling control model is obtained. The thickness adjustment amount is superimposed on the initial thickness of each strip, and the initial thickness distribution of the strips of the rolled piece is reset. The rolling process regulations in Table 3 are repeated to obtain the volume to be cut after the rolled piece is optimized by MAS rolling in this embodiment. Figure 9 A schematic diagram of a total cutting loss curve of a rolled piece after MAS rolling optimization is provided in an embodiment of the present invention, as shown in FIG. Figure 9 As shown, the horizontal axis is the plate width (m), with an interval of 0.5m; the vertical axis is the total amount of uneven deformation (mm), with an interval of 100mm. The black solid line is the curve of the amount to be cut without MAS rolling, and the black dotted line is the curve of the amount to be cut after MAS rolling optimization. After the above-mentioned MAS rolling method is optimized, the maximum protrusion of the head of this embodiment is 192.22mm, the maximum protrusion of the tail is 261.52mm, and the total cutting loss is 26961cm 3 The head and tail cutting loss increased by 31.3% compared with before optimization.

[0171] This invention can calculate the planar shape change of the rolled product after rolling based on billet size, equipment parameters, and specific rolling procedures, effectively improving the planar shape prediction model's predictive capabilities and accuracy for multiple steel grades, multiple sizes, and complex rolling process conditions. Based on the planar shape prediction results, the invention determines a variable thickness rolling control curve. Combined with the MAS rolling technology used on-site, this method develops a seven-point MAS setting method that facilitates equipment control. This provides technical support for online control of medium and thick plate planar shape, improves the poor planar shape optimization results caused by difficult equipment control and low control algorithm accuracy, and effectively improves product yield.

[0172] It is worth noting that the acquisition, storage, use, and processing of data in the technical solutions of this application are in compliance with the relevant provisions of laws and regulations. The user information in the embodiments of this application is obtained through legal and compliant channels, and the acquisition, storage, use, and processing of user information are authorized and agreed by the customer.

[0173] It is worth noting that the information collected in this application is information and data authorized by the user or fully authorized by all parties, and the collection, storage, use, processing, transmission, provision, disclosure and application of relevant data comply with the relevant laws, regulations and standards of relevant countries and regions, take necessary confidentiality measures, do not violate public order and good customs, and provide corresponding operation entrances for users to choose to authorize or refuse.

[0174] It is worth noting that the technical solution provided in this application provides users with corresponding operation entrances for them to choose to agree or reject the automated decision-making results; if the user chooses to reject, the expert decision-making process will be entered.

[0175] In the technical solution of the medium and thick plate plane shape optimization method based on variable thickness rolling provided by the embodiment of the present invention, the initial size of the rolled piece, material properties and rolling mill parameters are obtained, and the initial size of the rolled piece includes the initial width of the rolled piece and the initial length of the rolled piece; the rolled piece is decomposed into multiple metal bars according to the initial width and the initial length of the rolled piece; the multiple metal bars are rolled according to the initial size of the rolled piece, material properties, rolling mill parameters, input rolling process parameters and the initial size of each metal bar, and the volume to be compensated of each metal bar after rolling is generated; the variable thickness rolling control curve is determined according to the volume to be compensated and the initial size of each metal bar; according to the control point of MAS rolling technology Setting methods and variable thickness rolling control curves are used to generate control parameters for each rolling section. Based on the control parameters for each rolling section, the initial thickness of each metal bar is adjusted to obtain the thickness distribution of the slab after optimized variable thickness rolling. Based on the size data of the rolled piece and the specific rolling process regulations, the planar shape change of the rolled piece after rolling is calculated, and the thickness compensation curve of the variable thickness rolling pass is determined based on the uneven deformation of the planar shape. This provides theoretical support and technical guidance for online rolling control technology for medium and thick plates, effectively improves the plane shape control accuracy and the rectangularization rate of the finished product, has high applicability, reduces debugging costs and optimization difficulty, and improves energy utilization and product yield.

[0176] Figure 10 A schematic structural diagram of a medium and thick plate plane shape optimization device based on variable thickness rolling provided by an embodiment of the present invention, wherein the device is used to execute the medium and thick plate plane shape optimization method based on variable thickness rolling, such as Figure 10 As shown, the device includes: an acquisition unit 11, a decomposition unit 12, a rolling unit 13, a variable thickness rolling control curve determination unit 14, a control parameter generation unit 15 and a shape optimization unit 16.

[0177] The acquisition unit 11 is used to acquire the initial size of the rolled piece, material properties and rolling mill parameters. The initial size of the rolled piece includes the initial width and initial length of the rolled piece.

[0178] The decomposition unit 12 is used to decompose the rolled piece into a plurality of metal bars according to the initial width and initial length of the rolled piece.

[0179] The rolling unit 13 is used to roll multiple metal bars according to the initial size of the rolled piece, material properties, rolling mill parameters, input rolling process parameters and the initial size of each metal bar, and generate the volume to be compensated of each metal bar after rolling. The initial size of each metal bar includes the initial thickness of each metal bar.

[0180] The variable thickness rolling control curve determining unit 14 is used to determine the variable thickness rolling control curve according to the volume to be compensated and the initial size of each metal bar.

[0181] The control parameter generating unit 15 is used to generate the control parameters of each rolling section according to the control point setting method of the MAS rolling technology and the variable thickness rolling control curve.

[0182] The shape optimization unit 16 is used to adjust the initial thickness of each metal bar according to the control parameters of each rolling section to obtain the thickness distribution of the slab after variable thickness rolling optimization.

[0183] In the embodiment of the present invention, the device further includes: an analyzing unit 17 .

[0184] The analyzing unit 17 is used to analyze the imported rolling schedule table and generate rolling process parameters.

[0185] In the embodiment of the present invention, the decomposition unit 12 is specifically used to decompose the rolled piece along the width direction according to the initial width and initial length of the rolled piece to obtain a plurality of metal bars.

[0186] In an embodiment of the present invention, the rolling unit 13 is specifically used to roll multiple metal bars according to the initial size of the rolled piece, material properties, rolling mill parameters, rolling process parameters and the initial size of each metal bar, to generate the uneven deformation of the head and tail of the rolled piece and the rolled size of the metal bar; based on the uneven deformation of the head and tail of the rolled piece and the rolled size of the metal bar, the volume compensation amount of each metal bar after rolling is generated.

[0187] In an embodiment of the present invention, the rolling unit 13 is specifically used to apply the strip segmentation method, and according to the initial size, material properties, rolling mill parameters and rolling process parameters of the rolled piece, perform the current rolling pass on each metal strip to obtain the intermediate size after the current rolling pass; according to the intermediate size of each metal strip, generate the uneven deformation of the head and tail of the rolled piece after the current rolling pass; use the intermediate size as the initial size of the next rolling pass, use the next rolling pass as the current rolling pass, and repeat the steps of applying the strip segmentation method, and according to the initial size, material properties, rolling mill parameters and rolling process parameters of the rolled piece, perform the current rolling pass on each metal strip to obtain the intermediate size after the current rolling pass, until there is no next rolling pass, and obtain the size of the metal strip after rolling; superimpose the uneven deformation of the head and tail of the rolled piece after each rolling pass to generate the uneven deformation of the head and tail of the rolled piece after rolling.

[0188] In an embodiment of the present invention, the rolling unit 13 is specifically used to add the uneven deformation amounts of the head and tail of the rolled piece after rolling to generate the total uneven deformation amount of each metal bar; based on the total uneven deformation amount and the size of the metal bar after rolling, the volume compensation amount of each metal bar after rolling is generated.

[0189] In an embodiment of the present invention, the variable thickness rolling control curve determination unit 14 is specifically used to convert the volume to be compensated into the corresponding initial thickness adjustment amount of the metal bar according to the principle of volume invariance; and draw the variable thickness rolling control curve for each metal bar and the corresponding initial thickness adjustment amount of the metal bar.

[0190] In an embodiment of the present invention, the control parameter generation unit 15 is specifically used to optimize the initial thickness control node according to the control point setting method of the MAS rolling technology and the variable thickness rolling control curve, and generate a model setting curve; through the model setting curve, the control parameters of each rolling section are determined.

[0191] In an embodiment of the present invention, the shape optimization unit 16 is specifically used to determine the actual thickness adjustment amount of each metal bar according to the control parameters of each rolling section; the actual thickness adjustment amount of each metal bar is superimposed with the initial thickness of the corresponding metal bar to generate the slab thickness distribution after variable thickness rolling optimization.

[0192] In the embodiment of the present invention, the device further includes: an optimization rolling unit 18 and an optimization verification unit 19 .

[0193] The optimized rolling unit 18 is used to roll multiple metal bars according to the initial size of the rolled piece, material properties, rolling mill parameters, input rolling process parameters and the slab thickness distribution after variable thickness rolling optimization, and generate the optimized volume compensation amount of each metal bar after rolling.

[0194] The optimization verification unit 19 is used to perform optimization verification based on the volume to be compensated after optimization and the volume to be compensated before optimization, and generate a plane shape optimization capability verification result.

[0195] In the scheme of the embodiment of the present invention, the initial size of the rolled piece, the material properties and the rolling mill parameters are obtained, and the initial size of the rolled piece includes the initial width of the rolled piece and the initial length of the rolled piece; the rolled piece is decomposed into multiple metal bars according to the initial width and the initial length of the rolled piece; the multiple metal bars are rolled according to the initial size of the rolled piece, the material properties, the rolling mill parameters, the input rolling process parameters and the initial size of each metal bar, and the volume to be compensated of each metal bar after rolling is generated; according to the volume to be compensated and the initial size of each metal bar, the variable thickness rolling control curve is determined; according to the control point setting method of the MAS rolling technology and the variable thickness rolling control curve, the variable thickness rolling control curve is determined; according to the control point setting method of the MAS rolling technology and the variable thickness rolling control curve, the variable thickness rolling control curve is determined; according to the control point setting method of the MAS rolling technology and the variable thickness rolling control curve, the variable thickness rolling control curve is determined; Curve is used to generate control parameters for each rolling section; according to the control parameters of each rolling section, the initial thickness of each metal strip is adjusted to obtain the thickness distribution of the slab after variable thickness rolling optimization; according to the size data of the rolled piece and the specific rolling process regulations, the plane shape change of the rolled piece after rolling is calculated, and the thickness compensation curve of the variable thickness rolling pass is determined according to the uneven deformation of the plane shape, providing theoretical support and technical guidance for the online rolling control technology of medium and thick plates, effectively improving the plane shape control accuracy and the rectangular rate of the finished product, with high applicability, reducing the debugging cost and optimization difficulty, and improving the energy utilization rate and product yield rate.

[0196] The systems, devices, modules, or units described in the above embodiments may be implemented by computer chips or entities, or by products having certain functions. A typical implementation device is a computer device. Specifically, the computer device may be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smartphone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0197] An embodiment of the present invention provides a computer device, including a memory and a processor, the memory being used to store information including program instructions, the processor being used to control the execution of the program instructions, and the program instructions being loaded and executed by the processor to implement the various steps of the embodiment of the above-mentioned method for optimizing the plane shape of medium and thick plates based on variable thickness rolling. For a specific description, please refer to the embodiment of the above-mentioned method for optimizing the plane shape of medium and thick plates based on variable thickness rolling.

[0198] Reference below Figure 11 , which shows a structural diagram of a computer device 9600 suitable for implementing an embodiment of the present application.

[0199] like Figure 11 As shown, the computer device 9600 may include a central processing unit 9100 and a memory 9140; the memory 9140 is coupled to the central processing unit 9100. Figure 11is exemplary; other types of structures may also be used to supplement or replace this structure to implement telecommunication functions or other functions.

[0200] like Figure 11 As shown, the computer device 9600 may further include: a communication module 9110, an input unit 9120, an audio processor 9130, a display 9160, and a power supply 9170. It is worth noting that the computer device 9600 does not necessarily have to include Figure 11 In addition, the computer device 9600 may also include Figure 11 For components not shown, reference may be made to the prior art.

[0201] like Figure 11 As shown, the central processing unit 9100 is sometimes also referred to as a controller or operation control, and may include a microprocessor or other processor device and / or logic device. The central processing unit 9100 receives input and controls the operation of various components of the computer device 9600.

[0202] Memory 9140 can be, for example, one or more of a cache, flash memory, hard drive, removable media, volatile memory, non-volatile memory, or other suitable devices. It can store the aforementioned failure-related information and also store programs that execute the relevant information. The CPU 9100 can execute the programs stored in memory 9140 to implement information storage or processing.

[0203] The input unit 9120 provides input to the CPU 9100. The input unit 9120 may be, for example, a keypad or touch input device. The power supply 9170 is used to provide power to the computer device 9600. The display 9160 is used to display objects such as images and text. The display may be, for example, an LCD display, but is not limited thereto.

[0204] The memory 9140 may be a solid-state memory, such as a read-only memory (ROM), a random access memory (RAM), or a SIM card. Alternatively, it may be a memory that retains information even when power is off, can be selectively erased, and is provided with more data. Examples of such memory are sometimes referred to as EPROMs. The memory 9140 may also be some other type of device. The memory 9140 includes a buffer memory 9141 (sometimes referred to as a buffer). The memory 9140 may include an application / function storage unit 9142 for storing application programs and function programs, or processes for executing the operations of the computer device 9600 via the central processing unit 9100.

[0205] The memory 9140 may also include a data storage unit 9143 for storing data, such as contacts, digital data, pictures, sounds, and / or any other data used by the computer device. The driver storage unit 9144 of the memory 9140 may include various driver programs for the computer device's communication functions and / or for executing other functions of the computer device (such as a messaging application, a contact book application, etc.).

[0206] The communication module 9110 is a transmitter / receiver that transmits and receives signals via the antenna 9111. The communication module (transmitter / receiver) 9110 is coupled to the central processor 9100 to provide input signals and receive output signals, which may be the same as the case of a conventional mobile communication terminal.

[0207] Based on different communication technologies, multiple communication modules 9110 can be provided in the same computer device, such as a cellular network module, a Bluetooth module, and / or a wireless local area network module. The communication module (transmitter / receiver) 9110 is also coupled to a speaker 9131 and a microphone 9132 via an audio processor 9130 to provide audio output via the speaker 9131 and receive audio input from the microphone 9132, thereby implementing common telecommunication functions. The audio processor 9130 may include any suitable buffer, decoder, amplifier, etc. Furthermore, the audio processor 9130 is also coupled to the central processing unit 9100, enabling local recording via the microphone 9132 and playback of stored audio via the speaker 9131.

[0208] In particular, according to an embodiment of the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, an embodiment of the present invention includes a computer program product comprising a computer program tangibly embodied on a machine-readable medium, the computer program comprising program code for executing the methods shown in the flowcharts. In such an embodiment, the computer program can be downloaded and installed from a network via the communication module 9110, and / or installed from a removable medium.

[0209] Computer-readable media includes permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0210] For the convenience of description, the above devices are described as being divided into various units according to their functions. Of course, when implementing this application, the functions of each unit can be implemented in the same or multiple software and / or hardware.

[0211] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0212] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0213] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0214] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0215] The acquisition, storage, use, and processing of data in this application's technical solution comply with relevant national laws and regulations.

[0216] It should be noted that in the embodiments of the present application, certain software, components, models and other existing solutions in the industry may be mentioned. They should be regarded as exemplary. Their purpose is only to illustrate the feasibility of implementing the technical solution of the present application, but it does not mean that the applicant has or will necessarily use the solution.

[0217] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0218] The present application may be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The present application may also be practiced in distributed computing environments where tasks are performed by remote processing devices connected through a communications network. In a distributed computing environment, program modules may be located in local and remote computer storage media, including storage devices.

[0219] The various embodiments in this specification are described in a progressive manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences between the other embodiments. In particular, the system embodiments are generally similar to the method embodiments, so the description is relatively simple. For relevant parts, refer to the description of the method embodiments.

[0220] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A method for optimizing the plane shape of medium and thick plates based on variable thickness rolling, characterized in that: The method comprises: Obtaining initial dimensions of the rolled piece, material properties, and rolling mill parameters, wherein the initial dimensions of the rolled piece include an initial width and an initial length of the rolled piece; Decomposing the rolled piece into a plurality of metal bars according to the initial width and initial length of the rolled piece; Rolling a plurality of metal bars according to the initial dimensions of the rolled piece, material properties, rolling mill parameters, input rolling process parameters, and initial dimensions of each metal bar to generate a volume to be compensated for each metal bar after rolling, wherein the initial dimensions of each metal bar include an initial thickness of each metal bar; Determining a variable thickness rolling control curve based on the volume to be compensated and the initial size of each metal bar; Generate control parameters for each rolling section based on the control point setting method of the MAS rolling technology and the variable thickness rolling control curve; According to the control parameters of each rolling section, the initial thickness of each metal bar is adjusted to obtain the thickness distribution of the slab after variable thickness rolling optimization.

2. The method for optimizing the plane shape of medium and thick plates based on variable thickness rolling according to claim 1, characterized in that: The initial dimensions of the rolled piece also include: the initial thickness of the rolled piece; Material properties include: elastic modulus of rolled piece, Poisson’s ratio and material yield strength; The rolling mill parameters include: roughing mill roll radius, roughing mill roll elastic modulus, roughing mill roll Poisson's ratio, roughing mill friction coefficient, finishing mill roll radius, finishing mill roll elastic modulus, finishing mill roll Poisson's ratio and finishing mill friction coefficient.

3. The method for optimizing the plane shape of medium and thick plates based on variable thickness rolling according to claim 1, characterized in that: The method further comprises: The imported rolling schedule table is parsed to generate the rolling process parameters.

4. The method for optimizing the plane shape of medium and thick plates based on variable thickness rolling according to claim 3, characterized in that: The rolling process parameters include rolling mill type number, exit roll gap, bite speed, roll speed, rolling force and rolling temperature.

5. The method for optimizing the plane shape of medium and thick plates based on variable thickness rolling according to claim 1, characterized in that: The step of decomposing the rolled piece into a plurality of metal bars according to the initial width and the initial length of the rolled piece comprises: According to the initial width and initial length of the rolled piece, the rolled piece is decomposed along the width direction to obtain a plurality of metal bars.

6. The method for optimizing the plane shape of medium and thick plates based on variable thickness rolling according to claim 1, characterized in that: The method of rolling a plurality of metal bars according to the initial size of the rolled piece, the material properties, the rolling mill parameters, the input rolling process parameters and the initial size of each metal bar to generate the volume to be compensated of each metal bar after rolling includes: Rolling the plurality of metal bars according to the initial size of the rolled piece, material properties, rolling mill parameters, rolling process parameters and initial size of each metal bar to generate uneven deformation of the head and tail of the rolled piece and the size of the metal bar after rolling; According to the uneven deformation amount of the head and tail of the rolled piece and the size of the metal bar after rolling, the volume to be compensated of each metal bar after rolling is generated.

7. The method for optimizing the plane shape of medium and thick plates based on variable thickness rolling according to claim 6, characterized in that: The method of rolling a plurality of metal bars according to the initial size of the rolled piece, material properties, rolling mill parameters, rolling process parameters and initial size of each metal bar to generate uneven deformation of the head and tail of the rolled piece and the size of the metal bar after rolling includes: Applying a strip segmentation method, rolling each metal strip in a current rolling pass according to the initial size of the rolled piece, material properties, rolling mill parameters, and rolling process parameters, to obtain an intermediate size after rolling in the current rolling pass; According to the middle size of each metal bar, the uneven deformation of the head and tail of the rolled piece after the current rolling pass is generated; The intermediate size is used as the initial size of the next rolling pass, the next rolling pass is used as the current rolling pass, and the strip segmentation method is repeatedly applied to each metal strip to obtain the intermediate size after rolling in the current rolling pass according to the initial size of the rolled piece, the material properties, the rolling mill parameters, and the rolling process parameters, until there is no next rolling pass, and the size of the metal strip after rolling is obtained. The uneven deformation of the head and tail of the rolled piece after each rolling pass is superimposed accordingly to generate the uneven deformation of the head and tail of the rolled piece after rolling.

8. The method for optimizing the plane shape of medium and thick plates based on variable thickness rolling according to claim 6, characterized in that: The method of generating the volume to be compensated of each metal bar after rolling according to the uneven deformation of the head and tail of the rolled piece and the size of the metal bar after rolling includes: Adding the uneven deformation amounts of the head and tail of the rolled piece to generate the total uneven deformation amount of each metal bar; According to the total amount of uneven deformation and the size of the metal bars after rolling, the volume to be compensated of each metal bar after rolling is generated.

9. The method for optimizing the plane shape of medium and thick plates based on variable thickness rolling according to claim 1, characterized in that: The step of determining a variable thickness rolling control curve based on the volume to be compensated and the initial size of each metal bar comprises: According to the volume invariance principle, the volume to be compensated is converted into the corresponding initial thickness adjustment of the metal strip; The variable thickness rolling control curve is drawn by taking each metal bar element and the corresponding initial thickness adjustment amount of the metal bar element.

10. The method for optimizing the plane shape of medium and thick plates based on variable thickness rolling according to claim 1, characterized in that: The control point setting method according to the MAS rolling technology and the variable thickness rolling control curve generate control parameters for each rolling section, including: According to the control point setting method of the MAS rolling technology and the variable thickness rolling control curve, the initial thickness control node is optimized to generate a model setting curve; The control parameters of each rolling section are determined by setting the curve through the model.

11. The method for optimizing the plane shape of medium and thick plates based on variable thickness rolling according to claim 1, characterized in that: The step of adjusting the initial thickness of each metal bar according to the control parameters of each rolling section to obtain the thickness distribution of the slab after variable thickness rolling optimization includes: Determining the actual thickness adjustment amount of each metal bar according to the control parameters of each rolling section; The actual thickness adjustment amount of each metal bar element is superimposed on the initial thickness of the corresponding metal bar element to generate the thickness distribution of the slab after variable thickness rolling optimization.

12. The method for optimizing the plane shape of medium and thick plates based on variable thickness rolling according to claim 1, characterized in that: After adjusting the initial thickness of each metal bar according to the control parameters of each rolling section to obtain the slab thickness distribution after variable thickness rolling optimization, the method further includes: According to the initial size of the rolled piece, the material properties, the rolling mill parameters, the input rolling process parameters and the slab thickness distribution after variable thickness rolling optimization, a plurality of metal bars are rolled to generate an optimized volume to be compensated for each metal bar after rolling; Optimization verification is performed based on the volume to be compensated after optimization and the volume to be compensated before optimization, and a plane shape optimization capability verification result is generated.

13. A device for optimizing the plane shape of medium and thick plates based on variable thickness rolling, characterized in that: The device comprises: an acquisition unit, configured to acquire initial dimensions of the rolled piece, material properties, and rolling mill parameters, wherein the initial dimensions of the rolled piece include an initial width and an initial length of the rolled piece; a decomposition unit, configured to decompose the rolled piece into a plurality of metal bars according to the initial width and initial length of the rolled piece; a rolling unit configured to roll a plurality of metal bars according to the initial dimensions of the rolled piece, material properties, rolling mill parameters, input rolling process parameters, and initial dimensions of each metal bar, and generate a volume to be compensated for each metal bar after rolling, wherein the initial dimensions of each metal bar include an initial thickness of each metal bar; a variable thickness rolling control curve determining unit, configured to determine a variable thickness rolling control curve according to the volume to be compensated and the initial size of each metal bar; A control parameter generating unit, configured to generate control parameters for each rolling section according to the control point setting method of the MAS rolling technology and the variable thickness rolling control curve; The shape optimization unit is used to adjust the initial thickness of each metal strip according to the control parameters of each rolling section to obtain the thickness distribution of the slab after variable thickness rolling optimization.

14. A computer-readable medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method for optimizing the plane shape of a medium and thick plate based on variable thickness rolling as claimed in any one of claims 1 to 12 is implemented.

15. A computer device comprising a memory and a processor, wherein the memory is used to store information including program instructions, and the processor is used to control the execution of the program instructions, wherein: When the program instructions are loaded and executed by the processor, the method for optimizing the plane shape of medium and thick plates based on variable thickness rolling according to any one of claims 1 to 12 is implemented.

16. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the method for optimizing the plane shape of a medium and thick plate based on variable thickness rolling according to any one of claims 1 to 12 is implemented.

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