A method, device, equipment and medium for controlling edge defects of hot-rolled strip steel

Abstract

The application relates to the rolling technical field of metal, in particular to a control method, device, equipment and medium for edge defects of hot-rolled strip steel, the control method is applied to a hot-rolling width setting machine, and the control method comprises the following steps: preheating a slab to eliminate temperature differences of different positions of the slab in a heating process; after heat balance of the different positions of the slab is obtained, a chamfer hammer head parameter matched with slab width setting of the hot-rolling width setting machine is controlled to improve the stability of internal metal of the slab in the width setting process; and the hot-rolling width setting machine outputs relative side pressure matched with the slab width setting to control the width of the slab and reduce the deformation amount of the slab. Through the control method, the edge defects of the strip steel in the hot-rolling process are effectively reduced, the production quality and the qualified rate of the strip steel are improved, and the production cost of the strip steel is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal rolling, in particular to a method, device, equipment and medium for controlling edge defects of hot-rolled strip steel. BACKGROUND

[0002] The finished strip steel is rolled from a slab, and the slab deforms in the hot rolling process, causing edge defects of the finished strip steel, such as edge buckling. The occurrence rate of edge defects seriously affects the production quality, qualification rate and production cost of the strip steel. Therefore, how to reduce the edge defects of the strip steel in the hot rolling process is a technical problem to be solved at present. SUMMARY

[0003] The present application provides a method for controlling edge defects of hot-rolled strip steel, which solves the technical problem of edge defects of the strip steel in the hot rolling process, reduces the edge defects of the slab in the hot rolling process, and improves the production quality and qualification rate of the strip steel and reduces the production cost of the strip steel.

[0004] In a first aspect, the present application provides a method for controlling edge defects of hot-rolled strip steel, which is applied to a hot rolling sizing machine, and the method comprises:

[0005] Preheating the slab to eliminate the temperature difference of each position of the slab in the heating process;

[0006] After the slab reaches thermal equilibrium at each position, controlling the hot rolling sizing machine to output a chamfer hammer head parameter matched with the slab sizing, so as to improve the stability of the internal metal of the slab in the sizing process;

[0007] Controlling the hot rolling sizing machine to output a relative side pressure matched with the slab sizing, so as to control the width of the slab and reduce the deformation amount of the slab.

[0008] Further, the preheating of the slab to eliminate the temperature difference of each position of the slab in the heating process comprises: heating the slab at a heating speed corresponding to each of a plurality of preset heating sections.

[0009] Further, after the preheating of the slab, the method further comprises: removing the oxide skin on the surface of the slab.

[0010] Further, the control of the hot rolling sizing machine to output a chamfer hammer head parameter matched with the slab sizing comprises: establishing a finite element model based on the dog bone parameter of the slab, and determining the optimal chamfer hammer head parameter matched with the slab sizing through the finite element model.

[0011] Further, the finite element model is established based on the dog bone parameters of the slab, and the optimal chamfer hammer head parameters matched with the slab width setting are determined through the finite element model, which includes:

[0012] The dog bone unit and the chamfer hammer head unit are drawn on the finite element software to establish a three-dimensional model;

[0013] The three-dimensional model is meshed, and the unit types of the dog bone unit and the chamfer hammer head unit and the grid density corresponding to the unit types are set respectively;

[0014] The three-dimensional model is valued by using the dog bone parameters, the chamfer hammer head parameters, and the slab width setting;

[0015] The boundary conditions of the dog bone unit are set to control the chamfer hammer head unit to move along the preset motion trajectory;

[0016] The analysis step is set to determine the optimal chamfer hammer head parameters that minimize the deformation of the dog bone unit.

[0017] Further, the control of the hot rolling width setting machine to output the relative side pressure matched with the slab width setting includes: the relative side pressure is calculated by the following formula:

[0018] The relative side pressure = slab width reduction value / slab initial thickness.

[0019] In a second aspect, the application provides a control device for controlling defects of hot-rolled steel strip edges, which is applied to a hot rolling width setting machine, and includes:

[0020] A heat treatment module is configured to preheat the slab to eliminate the temperature difference of each position of the slab during the heating process;

[0021] A first parameter control module is configured to control the hot rolling width setting machine to output the chamfer hammer head parameters matched with the slab width setting after the heat balance of each position of the slab is achieved, so as to improve the stability of the internal metal of the slab during the width setting process;

[0022] A second parameter control module is configured to control the hot rolling width setting machine to output the relative side pressure matched with the slab width setting, so as to control the width of the slab and reduce the deformation of the slab.

[0023] Further, the first parameter control module is configured to control the hot rolling width setting machine to output the chamfer hammer head parameters matched with the slab width setting, which includes: establishing a finite element model based on the dog bone parameters of the slab, and determining the optimal chamfer hammer head parameters matched with the slab width setting through the finite element model.

[0024] In a third aspect, the present application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable in the processor, wherein the processor implements the method steps of any one of the first aspect when executing the program.

[0025] In a fourth aspect, the present application provides a computer readable storage medium, having stored thereon a computer program, which, when executed by a processor, implements the method steps of any one of the first aspect.

[0026] The one or more technical solutions in the embodiments of the present application have at least the following technical effects or advantages:

[0027] In the embodiments of the present application, a control method for controlling edge defects of hot-rolled strip steel is provided, the control method is applied to a hot-rolling width setting machine, and the control method comprises the following steps:

[0028] Firstly, a preheating treatment is performed on the slab to eliminate the temperature difference of each position of the slab in the heating process. In the process of heating the slab from room temperature to a high temperature for width setting, the temperature of the center position of the slab is higher than that of the edge position of the slab, which causes the metal in the slab to flow from the center to the edge, resulting in excessive aggregation of the metal at the edge of the slab and deformation. The control method preheats the slab before the slab enters the hot-rolling width setting machine, so that the slab maintains thermal equilibrium at each position during the heating process, which is beneficial to prevent the generation of edge defects of the strip steel.

[0029] Then, after the thermal equilibrium of each position of the slab is obtained, the hot-rolling width setting machine is controlled to output a chamfer hammer head parameter matched with the width setting of the slab, so as to improve the stability of the metal inside the slab during the width setting process. In this embodiment, by using the chamfer hammer head parameter matched with the width setting of the slab, the contact surface of the slab and the chamfer hammer head can better fit during the width setting process, the stress on the contact surface is uniform, and the movement of the metal inside the slab under the action of the non-zero resultant force is avoided, thereby improving the stability of the metal inside the slab during the width setting process, and being beneficial to prevent the generation of edge defects of the strip steel.

[0030] Finally, the hot-rolling width setting machine is controlled to output a relative side pressure amount matched with the width setting of the slab, so as to control the width of the slab and reduce the deformation amount of the slab. By controlling the relative side pressure amount applied to the slab during the width setting process, the deformation of the slab can be minimized under the premise of obtaining the required width setting of the slab, thereby being beneficial to prevent the generation of edge defects of the strip steel.

[0031] By the control method provided by the present application, the edge defects of the strip steel during the hot-rolling process are effectively reduced, the production quality and the qualification rate of the strip steel are improved, and the production cost of the strip steel is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0032] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments with reference made to the accompanying drawings. The drawings are for purposes of illustration only and are not intended to limit the present application thereto, as the present application can have application in forms other than those illustrated. Like reference numerals have been used wherever possible throughout the drawings and the following description to refer to like components.

[0033] In the drawings:

[0034] Figure 1 A schematic diagram showing the steps of the control method provided by the embodiment 1 of the present application is shown;

[0035] Figure 2 A schematic diagram showing the dog bone structure in the embodiment 1 of the present application is shown;

[0036] Figure 3 A schematic diagram showing the chamfered hammer head structure in the embodiment 1 of the present application is shown;

[0037] Figure 4 A schematic diagram showing the structure of the control device provided by the embodiment 2 of the present application is shown;

[0038] Figure 5 A schematic diagram showing the electronic structure device in the embodiment 3 of the present application is shown. DETAILED DESCRIPTION

[0039] Exemplary embodiments of the present disclosure will be described hereinafter with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0040] Embodiment 1

[0041] The present application analyzes the slab hot rolling process and finished strip steel through metallographic examination, electron microscope observation and energy spectrum analysis and other detection means, and provides a control method for hot rolling strip steel edge defects, solving the technical problem of edge defects of strip steel in the hot rolling process in the prior art.

[0042] To solve the above technical problem, the embodiment 1 of the present application provides a control method for hot rolling strip steel edge defects as shown in Figure 1 The control method is applied to a hot rolling width setting machine, and the control method comprises:

[0043] S1, preheating the slab to eliminate the temperature difference of each position of the slab in the heating process.

[0044] S2, after thermal equilibrium is achieved at each position of the slab, the output of the hot rolling width-fixing machine is controlled to match the chamfering hammer parameters with the width-fixing of the slab, so as to improve the stability of the metal inside the slab during the width-fixing process.

[0045] S3, control the output of the hot rolling mill to match the width of the slab, so as to control the width of the slab and reduce the deformation of the slab.

[0046] This embodiment first preheats the slab to eliminate temperature differences at various locations during the heating process. When the slab is heated from room temperature to a temperature suitable for width determination, the temperature at the center is higher than at the edges, causing metal to flow from the center to the edges, resulting in excessive metal accumulation and deformation at the edges. This control method, by preheating the slab before it enters the hot rolling mill, ensures that all parts of the slab maintain thermal equilibrium during the heating process, thus helping to prevent edge defects in the strip.

[0047] After achieving thermal equilibrium at various positions on the slab, the output parameters of the chamfering hammers from the hot rolling mill are controlled to match the slab width setting, thereby improving the stability of the internal metal of the slab during the width setting process. This embodiment, by using chamfering hammer parameters matched to the slab width setting, ensures better contact between the slab and the chamfering hammers during the width setting process, resulting in uniform force distribution on the contact surfaces. This prevents the internal metal of the slab from shifting under non-zero net force, thus improving the stability of the internal metal during the width setting process and helping to prevent the generation of edge defects in the strip.

[0048] Finally, the output of the hot rolling mill is controlled to match the width of the slab, thereby controlling the width of the slab and reducing its deformation. By controlling the relative lateral pressure applied to the slab during the width-fixing process, matching the width of the slab, the deformation of the slab can be minimized while obtaining the required width, thus helping to prevent the generation of edge defects in the strip.

[0049] The control method provided in this application effectively reduces edge defects in strip steel during hot rolling, improves strip steel production quality and pass rate, and reduces strip steel production costs.

[0050] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0051] Firstly, the term "and / or" appearing in the present document only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the existence of A alone, the existence of A and B together, and the existence of B alone. In addition, the character " / " in the present document generally represents an "or" relationship between the front and rear associated objects.

[0052] The embodiment provides a hot-rolled strip steel edge defect control method as shown in the figure, and the control method comprises steps S1-S3. Figure 1 The embodiment provides a hot-rolled strip steel edge defect control method as shown in the figure, and the control method comprises steps S1-S3.

[0053] Firstly, step S1 is performed, and a slab is preheated to eliminate temperature differences of different positions of the slab in a heating process.

[0054] The present application studies the slab shape change rule of the slab in the hot-rolled strip steel production process and the slab shape influencing factors in the hot-rolling setting width machine area, and the research result shows that when the slab made of steel material is heated to above 1100 DEG C, austenitization occurs, the slab after austenitization has good plasticity, low strength and certain toughness. When the slab temperature is lower than the critical temperature of the austenite to ferrite transformation of the steel material, the solid phase transformation of the austenite to the ferrite occurs, and the process is accompanied by the precipitation of carbide. With the decrease of the low-temperature carbon content, the plasticity of the ferrite is poor, and the critical temperature of the austenite to ferrite transformation of the steel material increases with the decrease of the carbon content. In the process of hot rolling of the slab, the temperature of the slab center is higher than the critical temperature of the austenite to ferrite transformation of the steel material, and the temperature of the slab edge is lower than the critical temperature of the austenite to ferrite transformation of the steel material, so that the slab center is austenite and the slab edge is ferrite, which is one of the reasons for the slab edge deformation such as edge skinning.

[0055] In order to realize the heat balance in the slab heating process, when the above phenomenon occurs, one way is to increase the discharge temperature of the heating furnace or to stop and wait for the temperature and the like to alleviate the occurrence of the edge skinning, but the measure increases the slab time in the furnace and the energy consumption, not only affects the production quality of the finished strip steel, reduces the production rhythm of the hot rolling production line, but also increases the production cost.

[0056] The present application further studies the thermal coupling process of the slab, and the research result shows that after the slab enters the hot-rolling setting width machine, the hot-rolling setting width machine rapidly heats the slab at normal temperature to a preset target temperature, for example, 1000 DEG C. Due to the limitation of the thermal stress of the steel material itself, the temperature difference of different positions of the slab is too large in the process, which is the most important factor leading to the edge skinning of the finished strip steel.

[0057] Therefore, the step heats the slab at a preset plurality of heating sections before the slab enters the hot rolling sizing mill, and the slab is heated at a corresponding heating speed of each of the heating sections.

[0058] Specifically, in each of the heating sections, the temperature difference between the positions of the slab is minimized by controlling the temperature change amount and the change speed, and the positions of the slab are kept in thermal equilibrium during the sizing rolling process, thereby preventing the occurrence of edge defects of the finished steel strip.

[0059] For example, if the target temperature of the slab in the hot rolling sizing mill is 1100℃, then when the slab sequentially passes through the preheating section, the first heating section, the second heating section, and the soaking section of the heating furnace, the slab is set to have an out-section temperature of 200℃ in the preheating section, and the heating speed of the heating section is set to be 10℃ / min, so as to ensure the thermal equilibrium of the positions of the slab during the process of heating the slab from room temperature to 200℃. The slab is set to have an out-section temperature of 500℃ in the first heating section, and the heating speed of the heating section is set to be 15℃ / min, so as to ensure the thermal equilibrium of the positions of the slab during the process of heating the slab from 100℃ to 500℃. The slab is set to have an out-section temperature of 1000℃ in the second heating section, and the heating speed of the heating section is set to be 20℃ / min, so as to ensure the thermal equilibrium of the positions of the slab during the process of heating the slab from 500℃ to 1000℃. Finally, in the soaking section, the slab is heated at a constant temperature of 1000℃ for 10 minutes, so as to ensure that the temperature difference between the inside and the outside of the slab is minimized.

[0060] Step S1 gradually heats the slab to a near-target temperature at a heating speed before the slab enters the hot rolling sizing mill, so as to ensure that the positions of the slab are kept in thermal equilibrium during the process of heating the slab from room temperature to the target temperature, thereby preventing the metal from moving to the edge of the slab during the sizing process, and causing edge defects of the finished steel strip.

[0061] As an optional implementation, the out-furnace temperature of the slab in the heating furnace is set to be 950℃-1050℃ according to actual conditions.

[0062] After step S1 is performed, iron oxide scales are formed on the surface of the heated slab, the hardness of the iron oxide scales is different from that of the metal inside the slab, and the uneven distribution of the iron oxide scales on the surface of the slab causes uneven force on the surface of the slab during the sizing process, and thus causes deformation. Therefore, before entering the hot rolling, the oxide scales on the surface of the slab need to be removed, so as to improve the smoothness of the surface of the slab and prevent the oxide scales from affecting the flatness of the surface of the slab during the sizing process of the slab.

[0063] As an optional implementation, the method of removing the oxide scales can be through a special cleaning agent, which is not limited herein.

[0064] Next, step S2 is executed. After thermal equilibrium is achieved at each position of the slab, the output of the hot rolling width sizing machine is controlled to match the chamfering hammer parameters with the width sizing of the slab, so as to improve the stability of the metal inside the slab during the width sizing process.

[0065] Slab width determination refers to the target width that the slab will achieve after being widened by a hot rolling mill. Currently, the commonly used hot rolling process involves striking the slab surface with a punched hammer after it enters the mill to improve the uniformity of metal deformation during the width reduction process.

[0066] However, through research on the process of the hammerhead striking the slab and the defects in the slab, it was found that when the hammerhead strikes the slab, the force exerted on the slab decreases from the center to the edge. This results in extremely uneven metal flow within the slab, with a portion of the slab width reduction being converted into extension towards the edge, causing metal to accumulate at the edge.

[0067] During the subsequent heating and width setting process of the slab, the accumulation of metal at the edge of the slab is further aggravated, causing the center thickness of the slab to be lower than the edge thickness, resulting in edge defects in the finished strip steel, such as edge warping.

[0068] For slabs with different fixed widths, different deformations will occur after being struck by a perforated hammer.

[0069] Therefore, in step S2 of this application, a chamfered hammerhead is used to replace the hole-type hammerhead. By determining the chamfered hammerhead parameters that match the width of the slab, the stability of the metal inside the slab during the width determination process is improved, thereby reducing the amount of metal accumulated on the edge of the slab and preventing the occurrence of defects on the edge of the strip.

[0070] Specifically, this includes establishing a finite element model based on the dog bone parameters of the slab, and determining the optimal chamfering hammer parameters that match the fixed width of the slab through the finite element model.

[0071] Due to varying degrees of plastic deformation in the slab, the thickness at the edges of the slab may be greater than that at the center. This type of slab shape, where the edge thickness is higher than the center thickness, is called a "dog bone" shape. Figure 2 The image shown is a side view of the dog bone after the slab has been hammered.

[0072] The establishment of a finite element model based on the dog-bone parameters of a large number of slabs obtained from the hot rolling site specifically includes the following steps:

[0073] Step S21: In the finite element software, based on the slab size, with the axial direction of the slab as the X-axis, the slab thickness direction as the Y-axis, and the striking direction of the chamfering hammer as the Z-axis, draw dog bone elements and chamfering hammer elements to establish a three-dimensional model.

[0074] Step S22, meshing the three-dimensional model, setting the cell types of the dog bone cell and the chamfer hammer head cell respectively, and the mesh density corresponding to the cell types.

[0075] The dog bone interior, dog bone surface, and the contact surface of the chamfer hammer head and the slab are all involved in the calculation, so dense mesh is set to ensure the accuracy of the calculation results; the part of the chamfer hammer head except the contact surface with the slab does not participate in the calculation, so sparse mesh is set to reduce the calculation amount of the finite element software.

[0076] Step S23, assigning values to the three-dimensional model using the dog bone parameters, chamfer hammer head parameters, and slab width setting.

[0077] The dog bone parameters include, as shown in Figure 2 , the dog bone peak position A, the protrusion thickness Hb of the dog bone peak position, the thickness increment Ht of the dog bone peak and the contact position of the chamfer hammer head, and the angle increment a at the dog bone peak.

[0078] The chamfer hammer head parameters include, as shown in Figure 3 , the bevel angle a, the convexity L1, the hole height L2, and the chamfer R.

[0079] The slab width setting is a constant preset according to actual needs.

[0080] Step S24, setting the boundary conditions of the dog bone cell and controlling the chamfer hammer head cell to move along the preset motion trajectory.

[0081] Step S25, setting the analysis step to determine the chamfer hammer head parameters that minimize the deformation of the dog bone cell.

[0082] In the first analysis step, the chamfer hammer head cell applies a knocking force to the dog bone cell, different chamfer hammer head parameters are set, the solver in the finite element model is submitted for calculation, and the deformation of the dog bone cell is analyzed.

[0083] In the second analysis step, the calculation process is converged.

[0084] Through step-by-step iteration of the analysis step, the chamfer hammer head parameters that minimize the deformation of the dog bone cell are determined.

[0085] Step S26, taking the chamfer as the optimal chamfer hammer head parameter corresponding to the slab width setting, controlling the hot rolling width setting machine to output the chamfer hammer head parameter matching the slab width setting to improve the stability of the internal metal of the slab during the width setting process.

[0086] Finally, step S3 is executed to control the hot rolling width setting machine to output the relative side pressure amount matching the slab width setting to control the width of the slab and reduce the deformation amount of the slab.

[0087] In the process of reducing the slab of different initial thickness to the target width, the relative side pressure is applied to the slab. If the relative side pressure is too small, the slab with certain dog bone shape cannot be flattened, and if the relative side pressure is too large, the surface of the slab is deformed.

[0088] The size of the relative side pressure is also called the relative side pressure amount. The factors affecting the relative side pressure amount mainly include the initial thickness of the slab, the width reduction value of the slab, the matching degree between the surface of the slab and the hammer head, the dog bone height of the slab after the width reduction, and the central thickening amount of the slab. In step S1, the central thickening of the slab has been eliminated by gradually heating the slab to maintain thermal equilibrium during the entire process of heating to the target temperature. In step S2, the matching between the surface of the slab with a certain width of the slab and the used chamfer hammer head parameters has been achieved by determining and setting the chamfer hammer head parameters, thereby greatly reducing the dog bone height of the slab after the width reduction. Therefore, in this step S3, only the initial thickness of the slab and the width reduction value of the slab need to be considered, and the determination process of the relative side pressure amount is simplified.

[0089] Therefore, first, the initial thickness D1 of the slab and the width D2 of the slab are obtained, according to:

[0090] The width reduction value D3 of the slab is the initial thickness D1 of the slab minus the width D2 of the slab, and the width reduction value D3 of the slab is obtained.

[0091] Then, according to the relative side pressure amount ε = the width reduction value D3 of the slab / the initial thickness D1 of the slab, the required relative side pressure amount ε is determined.

[0092] By the method provided in this embodiment 1, the defect rate of the finished strip steel after hot rolling is reduced from 3% to 0.79%, effectively reducing the edge defects of the strip steel during hot rolling, improving the production quality and qualification rate of the strip steel, and reducing the production cost of the strip steel.

[0093] Embodiment 2

[0094] Based on the same inventive concept, the embodiment two of the present application provides a hot rolled strip steel edge defect control device as shown in the accompanying drawings. Figure 4 The control device is applied to a hot rolling width reduction machine, and the control device comprises:

[0095] The heat treatment module 100 is used for preheating the slab to eliminate the temperature difference of each position of the slab during heating.

[0096] As an optional implementation, the heat treatment module 100 heats the slab at a preset plurality of heating sections with a corresponding heating speed of each heating section.

[0097] The first parameter control module 200 is configured to control the chamfer hammer head parameters output by the hot sizing mill to match the slab sizing after the slab reaches thermal equilibrium at each position, so as to improve the stability of the internal metal of the slab during the sizing process.

[0098] As an optional implementation, the heat treatment module 100 removes the oxide scale on the surface of the slab by using a cleaning agent after the preheating treatment of the slab.

[0099] As an optional implementation, the first parameter control module 200 is configured to control the chamfer hammer head parameters output by the hot sizing mill to match the slab sizing, including: establishing a finite element model based on the dog bone parameters of the slab, and determining the optimal chamfer hammer head parameters that match the slab sizing by using the finite element model.

[0100] As an optional implementation, the first parameter control module 200 is configured to control the chamfer hammer head parameters output by the hot sizing mill to match the slab sizing, including:

[0101] drawing the dog bone unit and the chamfer hammer head unit on the finite element software to establish a three-dimensional model;

[0102] dividing the three-dimensional model into grids, and setting the unit types of the dog bone unit and the chamfer hammer head unit, and the grid density corresponding to the unit types;

[0103] assigning values to the three-dimensional model by using the dog bone parameters, the chamfer hammer head parameters, and the slab sizing;

[0104] setting the boundary conditions of the dog bone unit, and controlling the chamfer hammer head unit to move along a preset motion trajectory;

[0105] setting an analysis step, and determining the optimal chamfer hammer head parameters that minimize the deformation of the dog bone unit.

[0106] The second parameter control module 300 is configured to control the relative side pressure output by the hot sizing mill to match the slab sizing, so as to control the width of the slab and reduce the deformation of the slab.

[0107] As an optional implementation, the second parameter control module 300 is configured to control the relative side pressure output by the hot sizing mill to match the slab sizing, including: calculating the relative side pressure by using the following formula:

[0108] The relative side pressure = slab reduction value / initial thickness of the slab.

[0109] The control device proposed in this application effectively reduces edge defects of strip steel during hot rolling, improves the production quality and pass rate of strip steel, and reduces the production cost of strip steel.

[0110] Example 3

[0111] Based on the same inventive concept, Embodiment 3 of this application provides an electronic device, as shown in the appendix. Figure 5 As shown, it includes a memory 304, a processor 302, and a computer program stored in the memory 304 and executable on the processor 302. When the processor 302 executes the program, it implements the steps of the above-described method for controlling edge defects in hot-rolled strip steel.

[0112] Among them, Figure 5 In this document, a bus architecture (represented by bus 300) is used. Bus 300 may include any number of interconnected buses and bridges, linking various circuits including one or more processors represented by processor 302 and memory represented by memory 304. Bus 300 may also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. Bus interface 306 provides an interface between bus 300 and receiver 301 and transmitter 303. Receiver 301 and transmitter 303 may be the same element, i.e., a transceiver, providing a unit for communicating with various other devices over a transmission medium. Processor 302 is responsible for managing bus 300 and general processing, while memory 304 can be used to store data used by processor 302 during operation.

[0113] Example 4

[0114] Based on the same inventive concept, Embodiment 4 of the present invention provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the above-described method for controlling edge defects in hot-rolled strip steel.

[0115] The algorithms and displays provided herein are not inherently related to any particular computer, virtual system, or other device. Various general-purpose systems can also be used in conjunction with the teachings herein. The required structure for constructing such systems is apparent from the above description. Furthermore, this invention is not directed to any particular programming language. It should be understood that the contents of the invention described herein can be implemented using various programming languages, and the above description of specific languages ​​is for the purpose of disclosing the best mode of implementation of the invention.

[0116] In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the application can be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been described in detail in order not to obscure the understanding of this description.

[0117] Similarly, it is to be understood that the embodiments of the present application can be readily combined with one another, and the various features of the individual aspects of the present application can be interchanged among the several embodiments. Similarly, it is to be understood that, in order to obviate obscuring the disclosure and to help understand one or more of the various aspects of the application, various features of the application are sometimes grouped together in a single embodiment, figure, or description of related features. However, this method of disclosure should not be interpreted as reflecting an intention that the application requires more features than are explicitly recited in each claim. Rather, inventive aspects lie in less than all features of a single disclosed embodiment. Thus, the claims following, which reflect the application claimed, are hereby expressly incorporated into this detailed description, with each claim acting as a separate embodiment of the application.

[0118] Those skilled in the art will appreciate that the modules in the apparatuses in the embodiments can be adapted and placed in one or more apparatuses other than the embodiments. The modules or units or components in the embodiments can be combined into one module or unit or component, and further can be divided into multiple sub-modules or sub-units or sub-components. Except that at least some of such features and / or processes or units are mutually exclusive, all combinations of all features disclosed in this specification (including the accompanying claims, abstract and drawings) and all processes or units of any methods or apparatuses so disclosed can be used in any combination. Unless explicitly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract and drawings) can be replaced by alternative features providing the same, equivalent, or similar functionality.

[0119] Further, those skilled in the art will appreciate that, although some embodiments herein include certain features of other embodiments but not others, the combination of features of different embodiments implies that the scope of the application encompasses different embodiments and that the features of the different embodiments can be combined in any combination.

[0120] Various component embodiments of the present application can be implemented in hardware, or as software modules running in one or more processors, or in combinations thereof. As will be appreciated by persons skilled in the art, a microprocessor or a digital signal processor (DSP) can be used in practice to implement some or all of the functionality of some or all of the components in the electronic device according to the embodiments of the present application. The present application can also be implemented as a program (e.g., computer program and computer program product) for performing part or all of the methods described herein on a device or apparatus, or on an apparatus or device program. Such a program can be stored on a computer readable medium or can be in the form of one or more signals. Such a signal can be downloaded from an Internet website, or can be available for

[0121] The above description is merely that of the embodiments of the present application, and the common knowledge of the specific structures and characteristics in the art is not described in detail. Those skilled in the art know all the common technical knowledge in the field of the present application before the filing date or the priority date, can know all the prior art in the field, and have the ability to apply the conventional experimental means before the date. Those skilled in the art can perfect and implement the present application with their own ability under the guidance of the present application, and some typical known structures or known methods should not be an obstacle for those skilled in the art to implement the present application. It should be noted that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should be considered as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. A method for controlling edge defects in hot-rolled strip steel, the method employing a control device for edge defects in hot-rolled strip steel, the control device being applied to a hot-rolling width-fixing mill, comprising a heat treatment module, a first parameter control module, and a second parameter control module, characterized in that... The control method includes: The slab is preheated to eliminate temperature differences at different locations during the heating process. After thermal equilibrium is achieved at various positions of the slab, the output parameters of the chamfering hammers of the hot rolling width-fixing mill are controlled to match the width-fixing of the slab, so as to improve the stability of the metal inside the slab during the width-fixing process. The hot rolling mill outputs a relative lateral pressure that matches the width of the slab, thereby controlling the width of the slab and reducing its deformation. The control of the chamfering hammer parameters output by the hot rolling mill to match the slab width includes: establishing a finite element model based on the dog bone parameters of the slab, and determining the optimal chamfering hammer parameters to match the slab width through the finite element model; The step of establishing a finite element model based on the dog bone parameters of the slab, and determining the optimal chamfering hammer parameters that match the fixed width of the slab through the finite element model, includes: Draw dog bone elements and chamfered hammer head elements on finite element software to create a three-dimensional model; The three-dimensional model is meshed, and the element types of dog bone elements and chamfered hammer head elements are set respectively, as well as the mesh density corresponding to the element types; The three-dimensional model is assigned values ​​using dog bone parameters, chamfering hammer parameters, and slab width. The dog bone parameters include the dog bone peak position A, the protrusion thickness Hb at the dog bone peak position, the thickness increment Ht at the contact point between the dog bone peak and the chamfering hammer, and the angle increment α at the dog bone peak. The chamfering hammer parameters include the slope angle α, convexity L1, hole height L2, and fillet radius R. The slab width is a preset constant based on actual requirements. Set the boundary conditions of the dog bone unit and control the chamfered hammer unit to move according to a preset motion trajectory; An analysis step is set up to determine the optimal chamfered hammer parameters that minimize the deformation of the dog bone unit.

2. The method for controlling edge defects in hot-rolled strip steel as described in claim 1, characterized in that, The preheating treatment of the slab to eliminate the temperature difference at different locations during the heating process includes: heating the slab in multiple preset heating sections at the heating rate corresponding to each heating section.

3. The method for controlling edge defects in hot-rolled strip steel as described in claim 1, characterized in that, After preheating the slab, the control method further includes removing the oxide scale from the surface of the slab.

4. The method for controlling edge defects in hot-rolled strip steel as described in claim 1, characterized in that, The control device includes: A heat treatment module is used to preheat the slab to eliminate temperature differences at different locations during the heating process. The first parameter control module is used to control the output of the chamfering hammer parameters of the hot rolling width stabilization machine to match the width stabilization of the slab after thermal equilibrium is achieved at various positions of the slab, so as to improve the stability of the metal inside the slab during the width stabilization process. The second parameter control module is used to control the output of the hot rolling mill to match the width of the slab, so as to control the width of the slab and reduce the deformation of the slab.

5. The method for controlling edge defects in hot-rolled strip steel as described in claim 4, characterized in that: The first parameter control module is used to control the output of the chamfering hammer parameters that match the width of the slab from the hot rolling mill, including: establishing a finite element model based on the dog bone parameters of the slab, and determining the optimal chamfering hammer parameters that match the width of the slab through the finite element model.

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