Roll gap value determination method and apparatus, electronic device, and storage medium

Abstract

The application provides a method and device for determining a roll gap value, electronic equipment and a storage medium, and relates to the technical field of steel rolling. The method comprises the following steps: obtaining preset rolling data; determining the current slab thickness after the target pass rolling is completed; determining the thickness difference value according to the current slab thickness and the preset outlet thickness of the target pass; when the absolute value of the thickness difference value is greater than or equal to a preset difference value, determining the target reduction amount of each unrolled pass according to the thickness difference value, the number of unrolled passes and the preset reduction amount corresponding to each unrolled pass; and finally determining the target roll gap value of each unrolled pass according to the target reduction amount of each unrolled pass. The accuracy of the roll gap value obtained by the roll gap value determination method can be improved.

Description

Technical Field

[0001] This application relates to the field of steel rolling technology, specifically to a method, apparatus, electronic device, and storage medium for determining roll gap value. Background Technology

[0002] During the steel plate rolling process, it is necessary to determine the roll gap value of the rolling mill so that the thickness of the steel plate rolled by the rolling mill meets the thickness requirements.

[0003] One method for determining roll gap value in related technologies involves pre-setting the number of all passes in the rolling process and the preset reduction amount for each pass. The roll gap value is determined based on the preset reduction amount for each pass. After the final pass of rolling is completed, the thickness of the steel plate is obtained to determine whether the thickness of the rolled steel plate meets the thickness requirements. However, determining the steel plate thickness after rolling may result in the steel plate being rolled too thick or too thin, thus the accuracy of the roll gap value obtained using this method is relatively low. Summary of the Invention

[0004] In view of the shortcomings of the above-mentioned related technologies, this application provides a method, apparatus, electronic device and storage medium for determining the roll gap value to solve the above-mentioned technical problems.

[0005] This application provides a method for determining the roll gap value, including:

[0006] Obtain preset rolling data, which includes preset passes and preset inlet thickness, preset outlet thickness and preset reduction for each pass;

[0007] After the target rolling pass is completed, the current slab thickness is determined. The target pass is not the final pass.

[0008] The thickness difference is determined based on the current slab thickness and the preset exit thickness of the target pass.

[0009] When the absolute value of the thickness difference is greater than or equal to the preset difference, the target reduction amount for each unrolled pass is determined based on the thickness difference, the number of unrolled passes, and the preset reduction amount corresponding to each unrolled pass.

[0010] The target roll gap value for each unrolled pass is determined based on the target reduction for each unrolled pass.

[0011] In one embodiment of this application, the target reduction amount for each unrolled pass is determined based on the thickness difference, the number of unrolled passes, and the preset reduction amount corresponding to each unrolled pass, including:

[0012] The ratio of the thickness difference to the number of unrolled passes is determined as the allocation amount;

[0013] The target reduction amount for each unrolled pass is determined based on the allocated amount and the preset reduction amount corresponding to each unrolled pass.

[0014] In one embodiment of this application, the target lane is the third-to-last lane in a preset lane sequence.

[0015] In one embodiment of this application, determining the target roll gap value for each unrolled pass based on the target reduction for each unrolled pass includes:

[0016] Based on the current slab thickness and the target reduction of the first unrolled pass, the target exit thickness of the first unrolled pass is determined, where the first unrolled pass is the penultimate pass.

[0017] The target exit thickness of the second unrolled pass is determined based on the target exit thickness of the first unrolled pass and the target reduction of the second unrolled pass. The second unrolled pass is the final pass.

[0018] The target roll gap value for each unrolled pass is determined based on the target exit thickness corresponding to each unrolled pass.

[0019] In one embodiment of this application, determining the target roll gap value for each unrolled pass based on the target exit thickness corresponding to each unrolled pass includes:

[0020] Based on the roll gap determination formula and the target exit thickness for each unrolled pass, the target roll gap value for each unrolled pass is determined. The roll gap determination formula includes:

[0021] S SET =S m0 -S OIL0 +hS m +S OIL -S RW +S RH +S ZSET ;

[0022] Among them, S SET S represents the target roll gap value. m0 S is the mill bounce length during zero adjustment. OIL0 Where S is the oil film thickness at zero adjustment, h is the target outlet thickness, and S is the oil film thickness at zero adjustment. m S is the mill bounce length during rolling. OIL S represents the oil film thickness during rolling. RW S is the compensation amount for work roll wear. RH S is the thermal expansion compensation amount of the work roll. ZSET This is the zero-adjustment roll gap indicator value.

[0023] To achieve the above and other related objectives, this application provides an apparatus for determining the roll gap value, comprising:

[0024] The data acquisition module is used to acquire preset rolling data, which includes preset passes and preset inlet thickness, preset outlet thickness and preset reduction amount for each pass;

[0025] The thickness determination module is used to determine the current slab thickness after the target rolling pass is completed;

[0026] The difference determination module is used to determine the thickness difference based on the current slab thickness and the preset exit thickness of the target pass.

[0027] The reduction amount determination module is used to determine the target reduction amount for each unrolled pass based on the thickness difference, the number of unrolled passes, and the preset reduction amount corresponding to each unrolled pass when the absolute value of the thickness difference is greater than or equal to a preset difference.

[0028] The roll gap value determination module is used to determine the target roll gap value for each unrolled pass based on the target reduction amount for each unrolled pass.

[0029] In one embodiment of this application, the compression amount determination module includes:

[0030] The first determining unit is used to determine the ratio of the thickness difference to the number of unrolled passes as the allocation amount;

[0031] The second determining unit is used to determine the target reduction amount for each unrolled pass based on the allocated amount and the preset reduction amount corresponding to each unrolled pass.

[0032] In one embodiment of this application, the target lane is the third-to-last lane in a preset lane sequence.

[0033] To achieve the above and other related objectives, this application also provides an electronic device, the electronic device comprising:

[0034] One or more processors;

[0035] A storage device for storing one or more programs that, when executed by one or more processors, cause the electronic device to implement the roll gap value determination method described in any of the foregoing embodiments.

[0036] To achieve the above and other related objectives, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a computer's processor, causes the computer to perform the roll gap value determination method described in any of the foregoing embodiments.

[0037] As described above, the method, apparatus, electronic device, and storage medium for determining roll gap value provided in this application have the following beneficial effects:

[0038] This application discloses a method for determining roll gap value. The method involves acquiring preset rolling data and determining the current slab thickness after the target pass rolling is completed. Then, the thickness difference is determined based on the current slab thickness and the preset exit thickness of the target pass. When the absolute value of the thickness difference is greater than or equal to the preset difference, the target reduction amount for each unrolled pass is determined based on the thickness difference, the number of unrolled passes, and the preset reduction amount corresponding to each unrolled pass. Finally, the target roll gap value for each unrolled pass is determined based on the target reduction amount for each unrolled pass. After the target pass, the thickness difference is compared with the preset difference. When the thickness difference is greater than or equal to the preset difference, the target reduction amount for each unrolled pass is determined based on the thickness difference, the number of unrolled passes, and the preset reduction amount corresponding to each unrolled pass. The target roll gap value for each unrolled pass is then determined based on the target reduction amount. Since the target pass is not the final pass, the roll gap value of the unrolled passes can be adjusted during the rolling process to ensure that the thickness of the rolled steel plate meets the thickness requirements. This can improve the accuracy of the roll gap value obtained by the roll gap value determination method.

[0039] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0040] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0041] Figure 1 This is a flowchart illustrating a method for determining the roll gap value, as shown in an exemplary embodiment of this application;

[0042] Figure 2 This is a block diagram illustrating a roll gap value determination apparatus according to an exemplary embodiment of this application. Detailed Implementation

[0043] The embodiments of this application will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be understood that the preferred embodiments are only for illustrating this application and are not intended to limit the scope of protection of this application.

[0044] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. Therefore, the drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0045] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present application. However, it will be apparent to those skilled in the art that embodiments of the present application may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present application.

[0046] Please see Figure 1 , Figure 1 This is a flowchart illustrating a method for determining the roll gap value, as shown in an exemplary embodiment of this application. (Reference) Figure 1 It can be seen that the method for determining this roll gap value may include:

[0047] Step S110: Obtain preset rolling data.

[0048] The preset rolling data includes preset passes and the preset inlet thickness, preset outlet thickness and preset reduction for each pass.

[0049] In one embodiment of this application, preset rolling data can be obtained. The preset rolling data can be pre-set by the operator based on different mill parameters and different steel plate rolling requirements. When rolling a steel plate, the corresponding preset rolling data can be determined according to the rolling requirements of the steel plate and the mill parameters, so that the rolled steel plate meets the rolling requirements, that is, the thickness of the rolled steel plate meets the preset steel plate thickness. A range value can be determined based on the preset steel plate thickness. When the thickness of the rolled steel plate is within this range value, it can be determined that the rolled steel plate meets the rolling requirements.

[0050] For example, the preset steel plate thickness can be 20 mm (millimeters).

[0051] It should be noted that the sum of the reduction amounts in all passes can equal the total reduction amount of the rolling mill. That is, the exit thickness of each pass and the preset steel plate thickness satisfy the steel plate thickness formula, which includes:

[0052]

[0053] Where rbd is the preset steel plate thickness in mm, rvbd is the exit thickness of each pass in mm, rianf is the starting pass, riend is the final pass, and eps(i) is the relative reduction rate of pass i. The formula for determining the relative reduction rate of pass i includes:

[0054]

[0055] Where he(i) is the exit thickness of the i-th pass in mm, and he(i-1) is the inlet thickness of the i-th pass in mm.

[0056] Step S120: After the target rolling pass is completed, determine the current slab thickness.

[0057] The target lane is not the final lane.

[0058] In one embodiment of this application, the current slab thickness can be determined after the target pass rolling is completed, that is, the exit thickness of the target pass can be determined.

[0059] In an exemplary embodiment, the target pass can be the third-to-last pass in a preset sequence, and the total number of rolling passes can be seven. Setting the third-to-last pass as the target pass allows for sufficient allocation for subsequent passes. If the target pass is set as the second-to-last pass, with a large allocation, the final pass might not be able to achieve the desired steel plate thickness in a single rolling operation. Furthermore, setting the target pass as the fourth-to-last or fifth-to-last pass might require adjusting the roll gap values ​​for multiple passes, resulting in more complex and numerous steps.

[0060] For example, the current slab thickness can be obtained by measuring with a thickness gauge.

[0061] Step S130: Determine the thickness difference based on the current slab thickness and the preset exit thickness of the target pass.

[0062] In one embodiment of this application, the thickness difference can be determined based on the current slab thickness and the preset exit thickness of the target pass. That is, the difference between the current slab thickness and the preset exit thickness of the target pass can be determined as the thickness difference, which can be positive or negative. When the thickness difference is positive, it indicates that the sum of the actual reduction amounts of all passes before the target pass is less than the preset reduction amount sum, resulting in a larger current slab thickness. The roll gap value of the remaining passes can be changed to alter the reduction amount of the remaining passes. When the thickness difference is negative, it indicates that the sum of the actual reduction amounts of all passes before the target pass is greater than the preset reduction amount sum, resulting in a smaller current slab thickness. The roll gap value of the remaining passes can be changed to alter the reduction amount of the remaining passes.

[0063] Step S140: When the absolute value of the thickness difference is greater than or equal to the preset difference, determine the target reduction amount for each unrolled pass based on the thickness difference, the number of unrolled passes, and the preset reduction amount corresponding to each unrolled pass.

[0064] In one embodiment of this application, when the absolute value of the thickness difference is greater than or equal to a preset difference, the target reduction amount for each unrolled pass is determined based on the thickness difference, the number of unrolled passes, and the preset reduction amount corresponding to each unrolled pass.

[0065] It should be noted that when the absolute value of the thickness difference is less than the preset difference, the roll gap value of the rolling mill does not need to be adjusted, and the steel plate can be rolled using the preset roll gap value. The preset value of the rolling mill roll gap can correspond to the preset inlet thickness, preset outlet thickness, and preset reduction for each pass. That is, the preset rolling data can include the preset passes and the preset inlet thickness, preset outlet thickness, preset reduction, and preset roll gap value for each pass.

[0066] For example, the preset difference can be 0.25mm.

[0067] In an exemplary embodiment, the process of determining the target reduction amount for each unrolled pass in step S140 based on the thickness difference, the number of unrolled passes, and the preset reduction amount corresponding to each unrolled pass may include steps S141 and S142.

[0068] Step S141: The ratio of the thickness difference to the number of unrolled passes is determined as the allocation amount.

[0069] In one embodiment of this application, the ratio of the thickness difference to the number of unrolled passes can be determined as the allocation amount.

[0070] For example, the thickness difference can be 0.66 mm, the number of unrolled passes can be 3, and the ratio of the thickness difference to the number of unrolled passes, 0.22 mm, can be determined as the allocation amount.

[0071] For example, the thickness difference can be -0.5 mm, the number of unrolled passes can be 2, and the ratio of the thickness difference to the number of unrolled passes, -0.25 mm, can be determined as the allocation amount.

[0072] Step S142: Determine the target reduction amount for each unrolled pass based on the allocated amount and the preset reduction amount corresponding to each unrolled pass.

[0073] In one embodiment of this application, the target reduction amount for each unrolled pass can be determined based on the allocation amount and the preset reduction amount corresponding to each unrolled pass. That is, the sum of the allocation amount and the preset reduction amount corresponding to the target unrolled pass can be determined as the target reduction amount for the target unrolled pass, and the target unrolled pass can be any unrolled pass.

[0074] For example, the allocation amount can be 0.22mm, and the preset reduction amount corresponding to the target unrolled pass can be 1.726mm. The sum of the allocation amount and the preset reduction amount corresponding to the target unrolled pass, 1.946mm, can be determined as the target reduction amount of the target unrolled pass.

[0075] For example, the allocation amount can be -0.25mm, and the preset reduction amount corresponding to the target unrolled pass can be 1.55mm. The sum of the allocation amount and the preset reduction amount corresponding to the target unrolled pass, 1.80mm, can be determined as the target reduction amount of the target unrolled pass.

[0076] Step S150: Determine the target roll gap value for each unrolled pass based on the target reduction amount for each unrolled pass.

[0077] In one embodiment of this application, step S150 can be used to determine the target roll gap value for each unrolled pass based on the target reduction amount for each unrolled pass.

[0078] In an exemplary embodiment, when the target pass is the third to last pass in the preset passes, step S150, which determines the target roll gap value for each unrolled pass based on the target reduction amount of each unrolled pass, may include steps S151 to S153.

[0079] Step S151: Determine the target exit thickness of the first unrolled pass based on the current slab thickness and the target reduction amount of the first unrolled pass.

[0080] The first unrolled pass is the penultimate pass.

[0081] In one embodiment of this application, the sum of the current slab thickness and the target reduction of the first unrolled pass can be determined as the target exit thickness of the first unrolled pass.

[0082] For example, Table 1 shows the preset rolling data for the last three passes in the rolling process.

[0083] Table 1. Preset rolling data for the last three passes during the rolling process.

[0084] path Preset inlet thickness / mm Preset outlet thickness / mm Preset compression amount / mm Third to last round 25.450 22.547 2.903 Second to last round 22.547 20.821 1.726 Final Stage 20.821 13.849 0.982

[0085] For example, the preset exit thickness of the third-to-last pass can be 22.547 mm, and the current slab thickness can be 23 mm. The thickness difference is 0.453 mm, which is greater than the preset difference of 0.25 mm. The ratio of this thickness difference to the number of unrolled passes (2), 0.227 mm (actually 0.2265, but in practical applications, three decimal places can be chosen), can be determined as the allocation amount. The preset reduction for the second-to-last pass can be 1.726 mm. The sum of the allocation amount 0.227 mm and the preset reduction of 1.726 mm (corresponding to the second-to-last pass), 1.953 mm, can be determined as the target reduction for the second-to-last pass, which corresponds to the target reduction for the second-to-last pass in Table 2. Table 2 shows the target inlet thickness, target outlet thickness, and target reduction for the two-to-last passes when the absolute value of the thickness difference is greater than or equal to the preset difference.

[0086] Table 2 shows the target inlet thickness, target outlet thickness, and target reduction for the last two passes.

[0087] path Target inlet thickness / mm Target exit thickness / mm Target reduction / mm Second to last round 23 21.047 1.726+0.227 Final Stage 21.047 19.838 0.982+0.227

[0088] Step S152: Determine the target exit thickness of the second unrolled pass based on the target exit thickness of the first unrolled pass and the target reduction of the second unrolled pass.

[0089] The second unrolled pass is the last pass.

[0090] In one embodiment of this application, the target exit thickness of the first unrolled pass is also the target inlet thickness of the second unrolled pass. Therefore, the target exit thickness of the second unrolled pass can be determined based on the target exit thickness of the first unrolled pass and the target reduction of the second unrolled pass.

[0091] Step S153: Determine the target roll gap value for each unrolled pass based on the roll gap determination formula and the target exit thickness for each unrolled pass. The roll gap determination formula includes:

[0092] S SET =S m0 -S OIL0 +hS m +S OIL -S RW+S RH +S ZSET ;

[0093] Among them, S SET S represents the target roll gap value. Z =S m0 -S OIL0 S is the roll gap value during zero adjustment. m0 S is the mill bounce length during zero adjustment. OIL0 The oil film thickness at zero adjustment is S0 = hS m The actual value of the roll gap is given, h is the target exit thickness, and S is the actual roll gap value. m S is the mill bounce length during rolling. OIL S represents the oil film thickness during rolling. RW S is the compensation amount for work roll wear. RH S is the thermal expansion compensation amount of the work roll. ZSET This is the zero-adjustment roll gap indicator value.

[0094] In one calculation, the target roll gap value and the target exit thickness are both data corresponding to the same unrolled pass.

[0095] Using the roll gap value determination method provided in the embodiments of this application, the situation of rolling steel plates thicker or thinner in multiple batches and large quantities can be avoided.

[0096] In one embodiment of this application, after the roll gap value is determined by the roll gap value determination method provided in the embodiments of this application and the steel plate is rolled, the actual entry thickness, actual exit thickness and actual reduction (which can be the target reduction) of each pass in the rolling process can be determined as target preset data. When rolling steel plates of the same thickness using the same rolling mill, the target preset data can be used for rolling. The roll gap value can also be determined by the roll gap value determination method provided in the embodiments of this application during the rolling process.

[0097] In summary, the solution of this application embodiment obtains preset rolling data and determines the current slab thickness after the target pass rolling is completed. Then, it determines the thickness difference based on the current slab thickness and the preset exit thickness of the target pass. When the absolute value of the thickness difference is greater than or equal to the preset difference, it determines the target reduction amount for each unrolled pass based on the thickness difference, the number of unrolled passes, and the preset reduction amount corresponding to each unrolled pass. Finally, it determines the target roll gap value for each unrolled pass based on the target reduction amount for each unrolled pass. After the target pass, the thickness difference is compared with the preset difference. When the thickness difference is greater than or equal to the preset difference, the target reduction amount for each unrolled pass is determined based on the thickness difference, the number of unrolled passes, and the preset reduction amount corresponding to each unrolled pass. The target roll gap value for each unrolled pass is then determined based on the target reduction amount. Since the target pass is not the final pass, the roll gap value of the unrolled passes can be adjusted during the rolling process to ensure that the thickness of the rolled steel plate meets the thickness requirements. This can improve the accuracy of the roll gap value obtained by the roll gap value determination method.

[0098] Figure 2 This is a block diagram illustrating a roll gap value determination apparatus according to an exemplary embodiment of this application. Figure 2 As shown, the exemplary roll gap value determination device 200 includes:

[0099] The data acquisition module 210 is used to acquire preset rolling data, which includes preset passes and preset inlet thickness, preset outlet thickness and preset reduction amount for each pass;

[0100] Thickness determination module 220 is used to determine the current slab thickness after the target rolling pass is completed;

[0101] The difference determination module 230 is used to determine the thickness difference based on the current slab thickness and the preset exit thickness of the target pass.

[0102] The reduction amount determination module 240 is used to determine the target reduction amount for each unrolled pass based on the thickness difference, the number of unrolled passes, and the preset reduction amount corresponding to each unrolled pass when the absolute value of the thickness difference is greater than or equal to the preset difference.

[0103] The roll gap value determination module 250 is used to determine the target roll gap value for each unrolled pass based on the target reduction amount for each unrolled pass.

[0104] In one exemplary embodiment, the compression amount determination module may include:

[0105] The first determining unit is used to determine the allocation amount as the ratio of the thickness difference to the number of unrolled passes;

[0106] The second determining unit is used to determine the target reduction amount for each unrolled pass based on the allocation amount and the preset reduction amount corresponding to each unrolled pass.

[0107] In one exemplary embodiment, the target lane can be the third-to-last lane in a preset lane sequence.

[0108] It should be noted that the roll gap value determination device and the roll gap value determination method provided in the above embodiments belong to the same concept. The specific operation methods of each module and unit have been described in detail in the method embodiments and will not be repeated here. In practical applications, the roll gap value determination device provided in the above embodiments can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. This is not a limitation here.

[0109] Embodiments of this application also provide an electronic device, including: one or more processors; and a storage device for storing one or more programs, which, when executed by one or more processors, cause the electronic device to implement the roll gap value determination method provided in the above embodiments.

[0110] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. Each block in a flowchart or block diagram may represent a module, segment, or portion of code, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0111] The units described in the embodiments of this application can be implemented in software or hardware, and the described units can also be located in a processor. The names of these units do not necessarily limit the specific unit itself.

[0112] Another aspect of this application provides a computer-readable storage medium storing a computer program thereon, which, when executed by a computer's processor, causes the computer to perform the roll gap value determination method provided in the various embodiments described above. This computer-readable storage medium may be included in the electronic device described in the above embodiments, or it may exist independently and not assembled into that electronic device.

[0113] Another aspect of this application provides a computer program product or computer program including computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the roll gap value determination method provided in the various embodiments described above.

[0114] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.

Claims

1. A method of determining a roll gap value, characterized by, The method comprises: acquiring preset rolling data, the preset rolling data comprising preset passes and preset entry thickness, preset exit thickness and preset reduction of each pass; determining a current slab thickness after rolling of a target pass ends, the target pass not being a final pass; determining a thickness difference value according to the current slab thickness and the preset exit thickness of the target pass; when an absolute value of the thickness difference value is greater than or equal to a preset difference value, determining a distribution amount as a ratio of the thickness difference value to a number of unrolled passes; and determining a target reduction of each unrolled pass according to the distribution amount and the preset reduction of each unrolled pass; determining a target roll gap value of each unrolled pass according to the target reduction of each unrolled pass; the target pass being a third last pass in the preset passes; the determining of the target roll gap value of each unrolled pass according to the target reduction of each unrolled pass comprising: determining a target exit thickness of a first unrolled pass according to the current slab thickness and the target reduction of the first unrolled pass, the first unrolled pass being a second last pass; determining a target exit thickness of a second unrolled pass according to the target exit thickness of the first unrolled pass and the target reduction of the second unrolled pass, the second unrolled pass being the final pass; determining a target roll gap value of each unrolled pass according to the target exit thickness of each unrolled pass; the determining of the target roll gap value of each unrolled pass according to the target exit thickness of each unrolled pass comprising: determining a target roll gap value of each unrolled pass according to a roll gap determination formula and the target exit thickness of each unrolled pass, the roll gap determination formula comprising: ； wherein, is a target roll gap value, is a mill spring length at zero setting, is an oil film thickness at zero setting, is a target exit thickness, is a mill spring length at rolling, is an oil film thickness at rolling, is a work roll wear compensation amount, is a work roll thermal expansion compensation amount, is a roll gap command value at zero setting.

2. An apparatus for determining a roll gap value, characterized by the device comprising: a data acquisition module configured to acquire preset rolling data, the preset rolling data comprising preset passes and preset entry thickness, preset exit thickness and preset reduction of each pass; a thickness determination module configured to determine a current slab thickness after rolling of a target pass ends, the target pass being a third last pass in the preset passes; a difference value determination module configured to determine a thickness difference value according to the current slab thickness and the preset exit thickness of the target pass; a reduction determination module configured to, when an absolute value of the thickness difference value is greater than or equal to a preset difference value, determine a target reduction of each unrolled pass according to the thickness difference value, a number of unrolled passes and the preset reduction of each unrolled pass; a roll gap value determination module configured to determine a target exit thickness of a first unrolled pass according to the current slab thickness and the target reduction of the first unrolled pass, the first unrolled pass being a second last pass; determine a target exit thickness of a second unrolled pass according to the target exit thickness of the first unrolled pass and the target reduction of the second unrolled pass, the second unrolled pass being the final pass; determine a target roll gap value of each unrolled pass according to a roll gap determination formula and the target exit thickness of each unrolled pass, the roll gap determination formula comprising: ； wherein, is a target roll gap value, is a mill spring length at zero setting, is an oil film thickness at zero setting, is a target exit thickness, is a mill spring length at rolling, is an oil film thickness at rolling, is a work roll wear compensation amount, is a work roll thermal expansion compensation amount, is a roll gap command value at zero setting; the reduction determination module comprising: A first determining unit is configured to determine a distribution value as a ratio of the thickness difference to the number of unrolling passes; A second determining unit is configured to determine a target reduction amount of each unrolling pass according to the distribution value and a preset reduction amount corresponding to each unrolling pass.

3. An electronic device, comprising: The electronic device includes: one or more processors; a storage device storing one or more programs, which, when executed by the one or more processors, cause the electronic device to implement the method for determining a roll gap value as claimed in claim 1.

4. A computer-readable storage medium, characterized in that, A computer program is stored thereon, which, when executed by a processor of a computer, causes the computer to perform the method for determining a roll gap value as claimed in claim 1.

Images