Strip steel thickness uniformity control method, device and equipment, storage medium and program product

Abstract

The invention discloses a strip steel thickness uniformity control method, device and equipment, a storage medium and a program product, and the method comprises the following steps: according to the type and hardness of strip steel and the rolling reduction of racks, setting the rolling reduction slope range of the strip steel in any rack in the hot continuous rolling process of a hot continuous rolling unit according to a configuration table, the rolling process of the hot continuous rolling unit is controlled by a hydraulic AGC system; any value in the rolling reduction slope range is used for representing the rolling reduction of the rack in unit time; according to the adjusting strategy table, the first rolling reduction slope of the first rack and the first preset time used for keeping the first rolling reduction slope are determined, and the first rolling reduction slope is used when the head area of the strip steel enters the first rack in the hot continuous rolling unit and is bitten; according to the adjustment strategy table, a second rolling reduction slope of the first rack is determined, and the second rolling reduction slope is larger than the first rolling reduction slope. The method can accurately control the thickness of the tail part of the strip steel to a target value, and improves the production quality of the strip steel.

Description

Technical Field

[0001] The present application belongs to the technical field of steel production, and in particular, relates to a method, device, equipment, storage medium and program product for controlling the thickness uniformity of a steel strip. Background Art

[0002] At present, the finishing area mostly uses four-roller fully hydraulic irreversible rolling mills for continuous rolling, which generally have 7 stands. During the rolling process, due to the thickness and hardness fluctuations of the strip steel raw materials entering the rolling mill, the rolling force of the stand changes, which in turn causes the thickness of the finished product at different positions of the strip to fluctuate. The hydraulic AGC system can achieve a certain degree of automatic thickness control and adjustment.

[0003] However, due to the large differences in working conditions at different rolling stages of the strip, the thickness deviations in the head area and the tail thick area are large, which in turn affects the overall yield of the strip and increases production costs. Summary of the invention

[0004] The embodiments of the present application provide a method, device, equipment, storage medium and program product for controlling the thickness uniformity of the strip, which can take into account the thickness uniformity of different positions of the strip while taking into account the efficiency of hot rolling, thereby improving the production quality of the strip.

[0005] In a first aspect, an embodiment of the present application provides a method for controlling the uniformity of strip thickness, the method comprising:

[0006] According to the type and hardness of the strip and the reduction amount of the stand, the reduction amount slope range of any stand during the hot rolling process of the hot rolling mill is set according to the configuration table, wherein the rolling process of the hot rolling mill is controlled by the hydraulic AGC system; any value in the reduction amount slope range is used to represent the reduction amount of the stand in unit time;

[0007] Determine, according to the adjustment strategy table, a first reduction slope of the first stand and a first predetermined time for maintaining the first reduction slope, wherein the first reduction slope is used when the head area of ​​the strip enters and bites into the first stand of the hot rolling mill group;

[0008] According to the adjustment strategy table, a second pressing amount slope of the first rack is determined, wherein the second pressing amount slope is greater than the first pressing amount slope.

[0009] In some optional embodiments, determining the first pressing amount slope of the first rack and the first predetermined time for maintaining the first pressing amount slope according to the adjustment strategy table includes:

[0010] According to the chemical composition of the steel strip and the adjustment strategy table, a composition correction coefficient is obtained;

[0011] Acquire the temperature of the strip entering the hot rolling mill;

[0012] Obtain a temperature correction coefficient according to the temperature and the adjustment strategy table;

[0013] Revise the first reduction slope according to the composition correction coefficient and the temperature correction coefficient.

[0014] In some alternative embodiments, the determining the first reduction slope of the first stand and the first predetermined time for maintaining the first reduction slope according to the adjustment strategy table includes:

[0015] Obtain multiple exit thicknesses of the strip at the stand and corresponding multiple times t1;

[0016] Obtain multiple thickness deviations of the strip according to the multiple exit thicknesses and the target thickness;

[0017] When two consecutive thickness deviations are within a preset range, determine the first predetermined time for maintaining the first reduction slope according to the corresponding time t1.

[0018] In some alternative embodiments, the determining the first predetermined time for maintaining the first reduction slope according to the corresponding time t1 when two consecutive thickness deviations are within a preset range includes:

[0019] Obtain multiple rolling forces at multiple time points after the head region of the strip enters the first stand in the hot continuous rolling mill and is bitten;

[0020] Obtain a rolling force volatility according to the multiple rolling forces,

[0021] When the thickness deviation is within the preset range and the rolling force volatility meets a preset value, determine the first predetermined time for maintaining the first reduction slope.

[0022] In some alternative embodiments, the determining the second reduction slope of the first stand according to the adjustment strategy table includes:

[0023] Obtain the real-time roll gap value of the first reduction slope;

[0024] Determine a roll gap compensation amount for the stand according to the roll temperature, the wear amount, the real-time roll gap value and the reduction;

[0025] Based on the roll gap value, the type of the strip, the hardness and the reduction, determine the second reduction slope of the first stand according to the adjustment strategy table.

[0026] In some alternative embodiments, along the opposite direction of the strip running, the hot continuous rolling mill includes a plurality of stands and a flying shear device arranged on one side of the stands, and the method further includes:

[0027] When the tail end of the strip is at a preset distance from the flying shear device, according to the adjustment strategy table, determine the third reduction slope of the hot continuous rolling mill, which is used for the tail end of the strip, wherein, the second reduction slope > the third reduction slope > the first reduction slope.

[0028] In a second aspect, an embodiment of the present application provides a strip thickness control device, the device includes:

[0029] A setting module, configured to set the reduction slope range of the strip at any stand during the hot continuous rolling process of the hot continuous rolling mill according to the type, hardness of the strip and the reduction of the stand, wherein, the rolling process of the hot continuous rolling mill is controlled by a hydraulic AGC system; any value in the reduction slope range is used to characterize the reduction of the strip rolled by the stand per unit time;

[0030] A determination module, configured to determine a first reduction slope for the head region of the strip to enter and bite into the first stand of the hot continuous rolling mill according to the adjustment strategy table, and a first predetermined time for maintaining the first reduction slope;

[0031] An operation module, configured to determine a second reduction slope of the first stand according to the adjustment strategy table, wherein, the second reduction slope is greater than the first reduction slope.

[0032] In a third aspect, an embodiment of the present application provides an electronic device, the electronic device includes: a processor and a memory storing computer program instructions; when the processor executes the computer program instructions, the control method for the strip thickness uniformity as described in any one of the above is implemented.

[0033] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which computer program instructions are stored, and when the computer program instructions are executed by a processor, the control method for the strip thickness uniformity as described in any one of the above is implemented.

[0034] In a fifth aspect, an embodiment of the present application provides a computer program product, when the instructions in the computer program product are executed by the processor of the electronic device, the electronic device is enabled to execute the control method for the strip thickness uniformity as described in any one of the above.

[0035] The control method, device, equipment, storage medium and program product for strip thickness uniformity in the embodiments of the present application can, according to the type and hardness of the strip and the reduction of the rolling mill stand, set the range of the reduction slope of the strip at any stand during the hot continuous rolling process in the hot continuous rolling mill according to the configuration table, and determine the first reduction slope of the first stand and maintain it for the first predetermined time according to the adjustment strategy table; then, determine the second reduction slope according to the adjustment strategy table. In this way, in the embodiments of the present application, for the impact at the moment of biting steel and the efficiency problem in the subsequent rolling stable stage that occur at different first stands in the hot continuous rolling mill, different reduction slopes are designed. On the basis of taking into account the hot rolling efficiency, the problems of difficult thickness control and large thickness fluctuations in the head and tail regions of the strip are solved, the thickness deviation at different positions of the strip can be reduced, and thus the production quality of the strip is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0037] Figure 1 FIG. shows a schematic diagram of a strip thickness uniformity control system provided by an embodiment of the present application;

[0038] Figure 2 FIG. shows a schematic diagram of the reduction slope of a 1580 mm hot continuous rolling strip production line in a comparative example of the present application;

[0039] Figure 3 FIG. shows a schematic flowchart of the control method for strip thickness uniformity provided by an embodiment of the present application;

[0040] Figure 4 FIG. shows a schematic diagram of the reduction slope of a 1580 mm hot continuous rolling strip production line in an embodiment of the present application;

[0041] Figure 5 FIG. shows a schematic diagram of the reduction slope of a 1580 mm hot continuous rolling strip production line in another embodiment of the present application;

[0042] Figure 6 FIG. is a schematic structural diagram of a strip thickness control device provided by an embodiment of the present application;

[0043] Figure 7 FIG. is a schematic structural diagram of an electronic device provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0044] The features and exemplary embodiments of various aspects of the present application will be described in detail below. To make the objectives, technical solutions, and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application and not to limit the present application. For those skilled in the art, the present application can be implemented without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by showing examples of the present application.

[0045] It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover a non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the said element.

[0046] During the strip production process, the strip thickness uniformity is one of the key indicators for measuring product quality. Strip with uneven thickness will have many problems in subsequent processing and use, such as affecting the strength, formability, etc. of the product. Traditional strip production systems have certain limitations in controlling strip thickness uniformity and are difficult to meet the increasingly high market demands.

[0047] The hot rolling mill is an important equipment that affects strip thickness uniformity. The strip is affected by the hot rolling mill and various related factors during the rolling process, such as roll wear, rolling force fluctuations, etc., which easily lead to deviations in strip thickness. And the existing thickness adjustment systems often have slow response speed and insufficient accuracy, and cannot accurately control the strip thickness in a timely and effective manner. Therefore, it is of great practical significance to develop a control method that can improve strip thickness uniformity.

[0048] To solve the problems of the prior art, the embodiments of the present application provide a control method, device, system, equipment, storage medium and program product for strip thickness uniformity. First, the steel plate straightening system provided by the embodiments of the present application will be introduced below.

[0049] Figure 1 The figure shows a schematic diagram of a strip thickness uniformity control system provided by an embodiment of the present application. As Figure 1As shown in the figure, the strip thickness uniformity control system 100 may include: a hot rolling mill 10, a strip conveying device 10, a hydraulic AGC adjustment system (not shown), and a flying shear device 30.

[0050] The hot rolling mill 10 includes a plurality of stands. For example, the hot rolling mill includes a first stand 2 where the strip enters and contacts the hot rolling mill, and a last stand 1 where the strip leaves and contacts the hot rolling mill. For example, in the finishing area of the hot rolling mill 10, a four-high fully hydraulic non-reversible rolling mill is mostly used for continuous rolling of 7 stands.

[0051] As one of the core equipment for strip production, the hot rolling mill is used for hot rolling the billet. Through the rotation and interaction of the rolls in the stands, the billet is gradually rolled into a strip with the required thickness. During the rolling process, parameters such as the accuracy, stiffness, and rolling speed of the rolls have a direct impact on the strip thickness uniformity. The hot rolling mill in this application adopts advanced roll materials and control methods to ensure that the rolls can still maintain good accuracy and stiffness during long-term high-speed operation, reducing the strip thickness deviation caused by roll factors.

[0052] The hot rolling mill selects a model with high-precision rolls. The roll material is a special alloy, which has been precisely processed and heat-treated, and its surface hardness and wear resistance have been significantly improved. During the rolling process, the surface hardness and wear resistance of the hot rolling mill affect the strip thickness uniformity.

[0053] The strip conveying device 10 can transport the unrolled strip to the hot rolling mill for rolling, and then smoothly and quickly convey the strip to the subsequent processes. It includes components such as drive rolls, support rolls, and drive motors. If the conveying device runs unstably, the strip may shake or shift during conveyance, thereby affecting the accuracy of thickness measurement and the subsequent thickness adjustment effect.

[0054] The hydraulic AGC (Automatic Gauge Control) adjustment system can monitor and adjust the strip thickness in real time. It mainly consists of a thickness gauge, a controller, and a hydraulic actuator. The thickness gauge is installed on the strip conveying path, and can quickly and accurately measure the actual thickness of the strip, and feedback the thickness data to the controller in real time. The controller, based on the preset thickness standard and the data feedback from the thickness gauge, after precise calculation, issues a control instruction to the hydraulic actuator. The hydraulic actuator can make timely adjustments when there are slight deviations in the strip thickness, effectively ensuring the strip thickness uniformity. Exemplarily, the thickness gauge in the hydraulic AGC adjustment system can adopt an advanced laser thickness gauge. Exemplarily, the measurement accuracy can reach ±0.01 mm.

[0055] In the related art, it is difficult to control the thickness of the head and tail of the strip during hot continuous rolling, the thickness fluctuation is large, and there is a thickness overshoot phenomenon during the strip production process. After analyzing the reasons, it is found that the same reduction rate slope is used for rolling. Figure 3 Fig. shows the reduction rate slope schematic diagram of a 1580mm hot continuous rolling strip production line of a comparative example of the present application; in the figure, a constant reduction rate slope is adopted, dynamic adjustment is not realized, and the capacity of the equipment is not fully utilized to achieve uniform strip thickness.

[0056] In a certain strip production factory, the strip thickness uniformity control system 100 of the embodiment of the present application is installed.

[0057] In order to solve the problems of difficult head and tail thickness control, large thickness fluctuation and thickness overshoot phenomenon during strip production in the prior art, the embodiment of the present application provides a control method for strip thickness uniformity. This method is applied to the strip thickness uniformity control system 100 and has the advantages of simplicity and effectiveness.

[0058] First, the control method for strip thickness uniformity provided by the embodiment of the present application will be introduced below.

[0059] Figure 3 Fig. shows a schematic flow chart of a control method for strip thickness uniformity provided by an embodiment of the present application. As Figure 3 shown, a control method for strip thickness uniformity may include the following steps: S100 to S300:

[0060] S100, according to the type, hardness of the strip and the reduction of the rolling mill stand, set the reduction rate slope range of any stand during the hot continuous rolling process of the strip in the hot continuous rolling mill according to the configuration table, wherein the rolling process of the hot continuous rolling mill is controlled by a hydraulic AGC system; the reduction rate slope includes a first reduction rate slope and a second reduction rate slope, and any value in the reduction rate slope range is used to characterize the reduction of the strip by the stand per unit time.

[0061] In this step, the hot continuous rolling mill may include multiple stands, and different stands correspond to different rolling sequences. Exemplarily, the hot continuous rolling mill may be a 7-stand hot continuous rolling mill. Stands 1-2: Roughing stands, whose main task is to greatly reduce the thickness of the rolled piece; Stands 3-4: Intermediate stands, transition stage, further reducing the thickness and controlling the width; Stands 5-7: Finishing stands, precisely controlling the thickness, shape and surface quality.

[0062] The above thickness deviation amount may be the thickening amount between the actual thickness and the target thickness of the strip.

[0063] The configuration table can be a guide table for dynamically adjusting the slope of the reduction amount within the range of the slope of the reduction amount according to the type of strip steel (steel grade), the hardness of the strip steel and the reduction amount of the stand, so as to ensure the stability of the rolling process and the quality of the product. The configuration table is a digitization of process experience and can be used to quickly match process parameters.

[0064] S200, according to the adjustment strategy table, determine the first reduction slope of the first stand and the first predetermined time for maintaining the first reduction slope, wherein the first reduction slope is used when the head area of ​​the strip enters and bites into the first stand in the hot rolling mill group.

[0065] In this step, in order to solve the problem of open-loop control caused by the momentary impact of biting steel when the strip enters the stand and starts to bite into the rolling mill, the first reduction slope and the first predetermined time of the first stand are determined. The stand may be a finish rolling stand.

[0066] For example, the first reduction slope may be 40% of the rack equipment capacity, and the first predetermined time may be 2-4 seconds. This can effectively avoid overshoot caused by the impact of biting steel, which may cause the strip thickness to be thin and pitted, and also avoid the head being broken due to the excessively fast adjustment rate and unstable strip threading when rolling thinner limit specifications, resulting in more scrap steel and affecting the yield rate of steel products.

[0067] The adjustment strategy table is driven by events. When the head area of ​​the strip enters and bites into the first stand of the hot rolling mill, the first reduction slope and the first predetermined time are controlled to achieve dynamic optimization of the rolling process, so as to avoid the problem of open-loop control when the strip enters the finishing rolling stand and bites into the rolling mill due to the instantaneous impact of biting the steel, causing the roll gap to open temporarily and fail to reach the detection range of the exit thickness gauge, so as to achieve uniform thickness of the strip.

[0068] The first reduction slope and the first predetermined time determined by the adjustment strategy table can also effectively avoid overshoot caused by the impact of biting the steel at the moment, which may cause thin pits in the thickness of the strip. It can also avoid the problem of head breakage and scrap steel caused by excessive adjustment rate and unstable strip threading at the moment of biting the steel when rolling thinner limit specifications, thereby reducing the yield rate.

[0069] The determination of the first predetermined time is also affected by the running speed of the strip. Generally speaking, the running speed of the strip is 3 to 12 m / s, and the distance from the first rack to the second rack is 30 meters. The predetermined time can be 3 to 4 seconds to ensure that the head of the strip remains stable before reaching the next rack.

[0070] S300. Determine the second reduction rate slope of the first stand according to the adjustment strategy table, where the second reduction rate slope is greater than the first reduction rate slope.

[0071] This second reduction rate slope is used after the first predetermined time, which can also be understood as when the strip exits the first stand, or when the thickness of the strip can be detected at the first stand, or when the strip enters the stable state of rolling. Exemplarily, this second reduction rate slope can be 80% of the equipment capacity of the stand.

[0072] Thus, this step can, on the basis of taking into account the rolling speed, ensure that the strip thickness is closest to the target thickness to the greatest extent, control the thickness error within 1 to 10 μm, and reduce the thickness fluctuation at different positions of the strip.

[0073] Figure 4 Fig. shows a schematic diagram of the reduction rate slope of the 1580 mm hot continuous rolling strip production line according to an embodiment of the present application; in this figure, the dynamic adjustment of the reduction rate slope is realized in the hot continuous rolling of the strip.

[0074] In some alternative embodiments, before S100, before setting the reduction rate slope range of any stand in the hot continuous rolling process of the strip in the hot continuous rolling mill according to the type, hardness of the strip and the reduction amount of the stand according to the configuration table, the method further includes:

[0075] Obtain the reduction amount of any stand in the hot continuous rolling mill according to the incoming thickness and target thickness of the strip. Thus, the reduction amount of any stand in the hot continuous rolling mill is facilitated for subsequent separate control of rolling and reduction of any stand to realize the hot continuous rolling of the strip.

[0076] In some alternative embodiments, S200. The step of determining the first reduction rate slope of the first stand and the first predetermined time for maintaining the first reduction rate slope according to the adjustment strategy table includes:

[0077] S201. Obtain the composition correction coefficient according to the chemical composition of the strip and the adjustment strategy table;

[0078] S202. Obtain the temperature at which the strip enters the hot continuous rolling mill;

[0079] S203. Obtain the temperature correction coefficient according to the temperature and the adjustment strategy table;

[0080] S204. Revise the first reduction rate slope according to the composition correction coefficient and the temperature correction coefficient.

[0081] According to the embodiments of the present application, different chemical components (such as C, Mn, and Si contents) directly affect the yield strength and work hardening rate of steel. According to the chemical composition and adjustment strategy table of the strip steel, the first reduction amount slope is corrected; temperature affects the stress distribution of materials. Uneven temperatures at the head and tail or edges of the strip steel (such as fast heat dissipation at the head and tail) will cause local thickness fluctuations, which can be compensated by dynamically adjusting the first reduction amount slope. Based on the material characteristics (composition) and environmental conditions (temperature), the first reduction amount slope is adjusted to avoid lag response and offset in real time the influence of external disturbances (such as temperature fluctuations) on the strip steel thickness, so that the thickness uniformity of the strip steel can still meet the standards under complex working conditions.

[0082] In some alternative embodiments, in S200, the determining of the first reduction amount slope of the first stand and the first predetermined time for maintaining the first reduction amount slope according to the adjustment strategy table includes:

[0083] S210, obtaining multiple outlet thicknesses of the strip steel at the stand and corresponding multiple times t1;

[0084] S220, obtaining multiple thickness deviations of the strip steel according to the multiple outlet thicknesses and the target thickness;

[0085] S230, when two consecutive thickness deviations are within a preset range, determining the first predetermined time for maintaining the first reduction amount slope according to the corresponding time t1.

[0086] According to the embodiments of the present application, when two consecutive thickness deviations are within a preset range, the first predetermined time is determined, indicating that the rolled strip steel is relatively stable at this time. By recording the time after the second outlet that meets the thickness deviation requirement, the first predetermined time is determined. Thus, the first reduction amount slope can be maintained for the first predetermined time, avoiding rolling with a larger reduction amount slope in the case of thickness fluctuations when the strip steel enters the finishing mill stand and bites into the rolling mill; after a relatively stable rolling stage, on the basis of taking into account efficiency, rolling is carried out with an appropriate reduction amount slope.

[0087] In some alternative embodiments, in S230, the determining of the first predetermined time for maintaining the first reduction amount slope according to the corresponding time t1 when two consecutive thickness deviations are within a preset range includes:

[0088] S231, obtaining multiple rolling forces at multiple time points after the head region of the strip steel enters the first stand in the hot continuous rolling mill and bites in;

[0089] S232, obtaining the rolling force volatility according to the multiple rolling forces,

[0090] S233: When the thickness deviation is within a preset range and the rolling force fluctuation rate satisfies a preset value, determine a first predetermined time for maintaining the first reduction slope.

[0091] After the head area of ​​the strip enters the first stand in the hot rolling mill and bites in, the rolling force will be dynamically adjusted according to the biting of the strip. When the thickness deviation is within the preset range and the rolling force fluctuation rate meets the preset value, it means that the rolling enters the stable stage. The first predetermined time for maintaining the first reduction slope is determined according to the corresponding time t1, and the first reduction slope is maintained for the first predetermined time, and the rolling enters the next stage. The reduction slope is dynamically adjusted, and the first reduction slope is maintained for an appropriate time, thereby improving the overall thickness uniformity of the strip.

[0092] In some optional embodiments, S300, determining the second pressing amount slope of the first rack according to the adjustment strategy table includes:

[0093] Obtaining a real-time roll gap value of the first pressing amount slope;

[0094] Determining a roll gap compensation amount for the stand according to the roll temperature, the wear amount, the real-time roll gap value and the press-down amount;

[0095] Based on the roll gap value, the type of the strip steel, the hardness and the reduction amount, a second reduction amount slope of the first stand is determined according to an adjustment strategy table.

[0096] In this step, the roll gap compensation amount may refer to the amount of adjustment made to the roll gap of the rolling mill in order to eliminate the thickness deviation. The roll gap compensation amount and the thickness deviation amount change in the opposite direction. For example, when the thickness deviation amount is positive (the actual thickness is greater than the target thickness), the roll gap compensation amount is negative (reducing the roll gap); when the thickness deviation amount is negative (the actual thickness is less than the target thickness), the roll gap compensation amount is positive (increasing the roll gap).

[0097] In this step, the rolling force and deformation resistance are balanced by dynamically adjusting the slope of the reduction amount to avoid mill vibration. In addition, the roll gap deviation caused by thermal expansion, wear or mechanical deformation of the rolls is compensated in real time to ensure the uniformity of the strip thickness, such as achieving high-precision control of ±1μm. According to the hardness and type of material characteristics and process parameters, such as optimizing the reduction slope, avoiding over-pressure or under-pressure, and reducing thickness deviation; dynamically adjusting the reduction strategy for different strip types (such as low-carbon steel, high-strength steel) and hardness, avoiding strip shape defects such as edge waves and middle waves, and improving the yield rate.

[0098] Taking into account the hardness fluctuation of the strip, for strips with large hardness fluctuations (such as cold-rolled silicon steel), the rolling force is stabilized by adjusting the slope of the reduction to reduce surface scratches or rolling marks.

[0099] In some optional embodiments, along the opposite direction of the running of the strip steel, the hot rolling mill group includes a plurality of racks and a flying shear device arranged on one side of the racks, and the method further includes:

[0100] S400, when the tail end of the strip is at a preset distance from the flying shear device, determine the third reduction slope of the hot rolling mill according to the adjustment strategy table, the third reduction slope is used for the tail end of the strip, wherein the second reduction slope>the third reduction slope>the first reduction slope. In this way, it can be avoided that the reduction slope is too large, resulting in unstable tail pressing, easy tail swinging or rolling breakage, and affecting the quality of the strip. It also helps to ensure the rolling stability of the tail of the strip, reduce the quality fluctuation of the tail of the strip, and improve the final yield rate.

[0101] For example, when the strip is close to the tail, especially about 1 meter away from the tail of the flying shear, the third reduction slope may be 50% to 60% of the rated value of the equipment.

[0102] In this step, the flying shear device 30 is used to cut the strip to a fixed length. In the process of controlling the uniformity of the strip thickness, the inaccurate shearing position of the flying shear device may result in the uneven thickness of the strip not being effectively cut off, affecting the product quality. The flying shear device of the present application can accurately control the shearing time according to the preset shearing length, reducing the impact of improper shearing on the uniformity of the strip thickness.

[0103] In addition, the flying shear device can be equipped with an independent control system, which can accurately calculate the shearing timing by communicating data with the speed sensor of the strip conveyor device to ensure the accuracy of the strip cutting to a fixed length.

[0104] When the strip approaches the tail, in order to avoid the larger slope of the third reduction which may lead to unstable tail pressing and easily cause tail swinging or crushing, the appropriate slope of the third reduction is determined according to the adjustment strategy table to improve the final yield rate.

[0105] In some optional embodiments, the method further includes:

[0106] Obtain multiple exit thicknesses of the strip steel at the rack and corresponding multiple times t1;

[0107] According to the exit thickness, the target thickness and the pressing amount of the frame, the hydraulic AGC system adjusts the roll gap corresponding to the frame to achieve uniform strip thickness.

[0108] In some optional embodiments, after the hydraulic AGC system adjusts the roll gap corresponding to the frame according to the exit thickness, the target thickness and the pressing amount of the frame to achieve uniform strip thickness, the method further includes:

[0109] Obtain the updated screwdown of the housing according to the roll gap.

[0110] According to the updated screwdown, update and set the slope of the fourth screwdown of the downstream stand in the hot continuous rolling process of the strip steel in the hot continuous rolling mill according to the configuration table.

[0111] According to the roll gap obtained in real time or the online detected roll gap value (such as laser ranging or sensor feedback), dynamically correct the screwdown to eliminate the roll gap deviation caused by roll thermal expansion, wear or mill springback, and ensure the longitudinal and transverse thickness uniformity of the strip steel (for example, control the thickness tolerance within ±5μm); the slope of the fourth screwdown is a specific value optimized by the process (such as a gentle slope suitable for high-hardness steel), which can avoid the thickness fluctuation caused by sudden screwdown. Thereby, the rolling stability can be improved, the strip steel thickness accuracy can be increased, and the shape quality can be improved, and the problems that the head and tail of the strip steel are prone to out-of-tolerance due to low temperature and speed change, and the problems that occur in endless rolling or variable thickness rolling (such as LP steel plates) can be solved.

[0112] Figure 5 The figure shows a schematic diagram of the slope of the screwdown of a 1580mm hot continuous rolling strip steel production line according to another embodiment of the present application; in this figure, in the hot continuous rolling of strip steel, multiple screwdown slopes are adopted to realize the dynamic adjustment of the screwdown slope, and the thickness uniformity of the strip steel is improved.

[0113] In some optional embodiments, when the head region of the strip steel enters the first stand in the hot continuous rolling mill and is bitten, according to the adjustment strategy table, determine the slope of the first screwdown in the hot continuous rolling process and maintain it for the first predetermined time, including:

[0114] The strip steel is silicon steel and has a thickness of 1.8 to 2.3mm. When the head region of the strip steel enters the first stand in the hot continuous rolling mill and is bitten, it is screwed down at 0.8 times the rated screwdown slope of the hot continuous rolling mill and maintained for 0.4s.

[0115] The grade of the silicon steel strip steel can be W2200000, and can also be W3200000. The thickness can be 1.8mm, 2.0mm, 2.3mm, etc.

[0116] Based on the strip steel thickness uniformity control method provided in the above embodiments, correspondingly, the present application also provides a specific implementation manner of the strip steel thickness control device. Please refer to the following embodiments.

[0117] As Figure 6 shown, the strip steel thickness uniformity control device 600 provided in the embodiment of the present application may include the following modules: a setting module 601, a determination module 602, and an operation module 603.

[0118] A setting module 601 is configured to set the reduction rate slope range of any stand in the hot continuous rolling process of the strip in a hot continuous rolling mill according to the type and hardness of the strip and the reduction rate of the stand, wherein the rolling process of the hot continuous rolling mill is controlled by a hydraulic AGC system; the reduction rate slope includes a first reduction rate slope and a second reduction rate slope, and any value in the reduction rate slope range is used to represent the reduction rate of the strip rolled by the stand per unit time;

[0119] A determination module 602 is configured to determine the first reduction rate slope of the first stand and the first predetermined time for maintaining the first reduction rate slope according to an adjustment strategy table, where the first reduction rate slope is used when the head region of the strip enters and bites into the first stand in the hot continuous rolling mill;

[0120] An operation module 603 is configured to determine the second reduction rate slope of the first stand according to the adjustment strategy table, where the second reduction rate slope is greater than the first reduction rate slope.

[0121] In some alternative embodiments, the strip thickness uniformity control device 600 further includes:

[0122] A reduction rate distribution module is configured to obtain the reduction rate of any stand in the hot continuous rolling mill according to the incoming thickness and target thickness of the strip.

[0123] In some alternative embodiments, the determination module 602 specifically includes:

[0124] A composition correction module is configured to obtain a composition correction coefficient according to the chemical composition of the strip and the adjustment strategy table;

[0125] A strip temperature acquisition module is configured to acquire the temperature of the strip when it enters the hot continuous rolling mill;

[0126] A temperature correction module is configured to obtain a temperature correction coefficient according to the temperature and the adjustment strategy table;

[0127] A first reduction rate slope revision module is configured to revise the first reduction rate slope according to the composition correction coefficient and the temperature correction coefficient.

[0128] In some alternative embodiments, the determination module 602 specifically includes:

[0129] A stand outlet acquisition module is configured to acquire the multiple outlet thicknesses of the strip at the stand and the corresponding multiple times t1;

[0130] A thickness deviation calculation module is configured to obtain multiple thickness deviations of the strip according to the multiple outlet thicknesses and the target thickness;

[0131] The first predetermined time first determination module is configured to determine, when two consecutive thickness deviations are within a preset range, a first predetermined time for maintaining the first reduction rate slope according to the corresponding time t1.

[0132] In some alternative embodiments, the first predetermined time determination module specifically includes:

[0133] The rolling force acquisition module is configured to acquire multiple rolling forces at multiple time points after the head region of the strip enters the first stand of the hot continuous rolling mill and is bitten.

[0134] The rolling force volatility calculation module is configured to obtain the rolling force volatility according to the multiple rolling forces.

[0135] The first predetermined time second determination module determines the first predetermined time for maintaining the first reduction rate slope when the thickness deviation is within a preset range and the rolling force volatility meets a preset value.

[0136] In some alternative embodiments, the operation module 603 specifically includes:

[0137] The roll gap value acquisition module is configured to acquire the real-time roll gap value of the first reduction rate slope.

[0138] The roll gap compensation amount determination module is configured to determine the roll gap compensation amount for the stand according to the roll temperature, the wear amount, the real-time roll gap value, and the reduction amount.

[0139] The second reduction rate slope determination module is configured to determine the second reduction rate slope of the first stand based on the roll gap value, the type of the strip, the hardness, and the reduction amount according to the adjustment strategy table.

[0140] In some alternative embodiments, along the opposite direction of the strip running, the hot continuous rolling mill includes multiple stands and a flying shear device arranged on one side of the stands. The strip thickness uniformity control device 600 further includes:

[0141] The third reduction rate slope determination module is configured to determine the third reduction rate slope of the hot continuous rolling mill according to the adjustment strategy table when the tail end of the strip is at a preset distance from the flying shear device. The third reduction rate slope is for the tail end of the strip, where the second reduction rate slope > the third reduction rate slope > the first reduction rate slope.

[0142] In some alternative embodiments, the strip thickness uniformity control device 600 further includes:

[0143] The stand outlet acquisition module acquires the multiple outlet thicknesses of the strip at the stand and the corresponding multiple times t1.

[0144] The roll gap adjustment module is used to adjust the roll gap corresponding to the stand according to the outlet thickness, the target thickness, and the screwdown of the stand, so that the hydraulic AGC system can achieve uniform strip thickness.

[0145] In some alternative embodiments, the strip thickness uniformity control device 600 further includes:

[0146] The screwdown update module is used to obtain the updated screwdown of the stand according to the roll gap;

[0147] The fourth screwdown slope determination module updates and sets the fourth screwdown slope of the downstream stand in the hot continuous rolling process of the strip in the hot continuous rolling mill according to the updated screwdown according to the configuration table.

[0148] Figure 7 The schematic diagram of the hardware structure of the electronic device provided by the embodiment of the present application is shown.

[0149] The electronic device may include a processor 701 and a memory 702 storing computer program instructions.

[0150] Specifically, the above-mentioned processor 701 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured as one or more integrated circuits implementing the embodiments of the present application.

[0151] The memory 702 may include a mass storage for data or instructions. By way of example and not limitation, the memory 702 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. In a suitable case, the memory 702 may include a removable or non-removable (or fixed) medium. In a suitable case, the memory 702 may be internal or external to the integrated gateway disaster recovery device. In a specific embodiment, the memory 702 is a non-volatile solid state memory.

[0152] In a particular embodiment, the memory 702 may include a read-only memory (ROM), a random access memory (RAM), a magnetic disk storage media device, an optical storage media device, a flash memory device, an electrical, optical, or other physical / tangible memory storage device. Thus, generally, the memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the method according to an aspect of the present disclosure.

[0153] The processor 701 reads and executes the computer program instructions stored in the memory 702 to implement any one of the strip thickness uniformity control methods in the above embodiments.

[0154] In one example, the electronic device may further include a communication interface 703 and a bus 710. Among them, as Figure 7 shown, the processor 701, the memory 702, and the communication interface 703 are connected through the bus 710 and complete communication with each other.

[0155] The communication interface 703 is mainly used to implement communication between each module, device, unit, and / or device in the embodiments of the present application.

[0156] The bus 710 includes hardware, software, or both, and couples the components of the electronic device to each other. By way of example and not limitation, the bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Extended Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an InfiniBand interconnect, a Low Pin Count (LPC) bus, a memory bus, a MicroChannel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local (VLB) bus, or other suitable buses or a combination of two or more of these. In a suitable case, the bus 710 may include one or more buses. Although the embodiments of the present application describe and illustrate a specific bus, the present application contemplates any suitable bus or interconnect.

[0157] The electronic device can execute the strip thickness uniformity control method in the embodiments of the present application, thereby implementing the strip thickness uniformity control method and device described in combination with Figure 1 and Figure 6 described.

[0158] In addition, in combination with the method for controlling the strip thickness uniformity in the above embodiments, an embodiment of the present application can provide a computer-readable storage medium to implement. Computer program instructions are stored on the computer-readable storage medium; when the computer program instructions are executed by a processor, any one of the methods for controlling the strip thickness uniformity in the above embodiments is implemented.

[0159] In combination with the method for controlling the strip thickness uniformity in the above embodiments, an embodiment of the present application can provide a computer program product. When the instructions in the computer program product are executed by a processor of an electronic device, the electronic device is enabled to execute the method for controlling the strip thickness uniformity as described above in any item.

[0160] It should be clear that the present application is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, the detailed description of known methods is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order between steps after understanding the spirit of the present application.

[0161] It should also be noted that the functional blocks shown in the above structure block diagrams can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application-specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, and so on. When implemented in software, the elements of the present application are programs or code segments used to perform the required tasks. The program or code segment can be stored in a machine-readable medium or transmitted via a data signal carried in a carrier wave on a transmission medium or a communication link. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical discs, hard disks, fiber optic media, radio frequency (RF) links, and so on. The code segment can be downloaded via a computer network such as the Internet, an intranet, and so on.

[0162] It also needs to be noted that the exemplary embodiments mentioned in the present application describe some methods or systems based on a series of steps or devices. However, the present application is not limited to the order of the above steps. That is, the steps can be executed in the order mentioned in the embodiments, can be different from the order in the embodiments, or several steps can be executed simultaneously.

[0163] As described above with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems) and computer program products according to embodiments of the present disclosure. It should be understood that each block in the flowchart and / or block diagram, and the combination of blocks in the flowchart and / or block diagram, 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, or other programmable data processing device to produce a machine, such that the instructions executed by the processor of the computer or other programmable data processing device enable the implementation of the functions / actions specified in one or more blocks of the flowchart and / or block diagram. Such a processor can be, but is not limited to, a general purpose processor, a special purpose processor, a special application processor, or a field programmable logic circuit. It should also be understood that each block in the block diagram and / or flowchart, and the combination of blocks in the block diagram and / or flowchart, can also be implemented by dedicated hardware that performs the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0164] As described above, the foregoing is only the specific implementation manner of the present application. Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, modules, and units described above can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein. It should be understood that the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered by the protection scope of the present application.

Claims

1. A method for controlling the uniformity of strip thickness, characterized in that: The method comprises: According to the type and hardness of the steel strip and the reduction amount of the stand, the reduction amount slope range of any stand of the steel strip during the hot rolling process of the hot rolling mill is set according to the configuration table, wherein the rolling process of the hot rolling mill is controlled by a hydraulic AGC system; any value in the reduction amount slope range is used to characterize the reduction amount per unit time when the stand rolls the steel strip; Determine, according to the adjustment strategy table, a first reduction slope for the first stand and a first predetermined time for maintaining the first reduction slope, wherein the first reduction slope is when the head region of the strip enters and bites into the first stand of the hot rolling mill group; According to the adjustment strategy table, a second pressing amount slope of the first rack is determined, wherein the second pressing amount slope is greater than the first pressing amount slope.

2. The method according to claim 1, characterized in that The step of determining, according to the adjustment strategy table, a first pressing amount slope of the first rack and a first predetermined time for maintaining the first pressing amount slope comprises: According to the chemical composition of the steel strip and the adjustment strategy table, a composition correction coefficient is obtained; Acquire the temperature of the strip entering the hot rolling mill; Obtaining a temperature correction coefficient according to the temperature and the adjustment strategy table; The first reduction slope is revised according to the composition correction factor and the temperature correction factor.

3. The method according to claim 1, characterized in that The step of determining, according to the adjustment strategy table, a first pressing amount slope of the first rack and a first predetermined time for maintaining the first pressing amount slope comprises: Obtain multiple exit thicknesses of the strip steel at the rack and corresponding multiple times t1; Obtaining a plurality of thickness deviations of the strip according to the plurality of exit thicknesses and target thicknesses; When two consecutive thickness deviations are within a preset range, a first predetermined time for maintaining the first depression amount slope is determined according to the corresponding time t1.

4. The method according to claim 3, characterized in that The determining, when two consecutive thickness deviations are within a preset range, according to the corresponding time t1, and determining, according to the corresponding time t1, a first predetermined time for maintaining the first depression amount slope, comprises: Acquire multiple rolling forces at multiple time points after the head area of ​​the strip enters and bites into the first stand of the hot rolling mill group; According to the plurality of rolling forces, a rolling force fluctuation rate is obtained, When the thickness deviation is within a preset range and the rolling force fluctuation rate meets a preset value, a first predetermined time for maintaining the first reduction amount slope is determined.

5. The method according to claim 1, characterized in that The determining, according to the adjustment strategy table, the second pressing amount slope of the first rack comprises: Obtaining a real-time roll gap value of the first pressing amount slope; Determining a roll gap compensation amount for the stand according to the roll temperature, the wear amount, the real-time roll gap value and the press-down amount; Based on the roll gap value, the type of the strip steel, the hardness and the reduction amount, a second reduction amount slope of the first stand is determined according to an adjustment strategy table.

6. The method according to claim 1, characterized in that In the opposite direction of the running of the strip steel, the hot rolling mill group includes a plurality of frames and a flying shear device arranged on one side of the frames, and the method further includes: When the tail end of the strip is at a preset distance from the flying shear device, the third reduction slope of the hot rolling mill group is determined according to the adjustment strategy table, and the third reduction slope is used for the tail end of the strip, wherein the second reduction slope>the third reduction slope>the first reduction slope.

7. A strip thickness control device, characterized in that: The device comprises: A setting module is used to set the slope range of the reduction amount of any stand in the hot rolling process of the hot rolling mill according to the type and hardness of the strip and the reduction amount of the stand according to the configuration table, wherein the rolling process of the hot rolling mill is controlled by a hydraulic AGC system; any value in the slope range of the reduction amount is used to characterize the reduction amount per unit time when the stand rolls the strip; A determination module, for determining, according to an adjustment strategy table, a first reduction slope for a first stand and a first predetermined time for maintaining the first reduction slope, wherein the first reduction slope is when the head region of the strip enters and bites into the first stand of the hot rolling mill group; An operation module is used to determine a second pressing amount slope of the first rack according to an adjustment strategy table, wherein the second pressing amount slope is greater than the first pressing amount slope.

8. An electronic device, characterized in that: The electronic device comprises: a processor and a memory storing computer program instructions; when the processor executes the computer program instructions, the method for controlling the thickness uniformity of the strip steel as described in any one of claims 1-6 is implemented.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer program instructions, and when the computer program instructions are executed by a processor, the method for controlling the thickness uniformity of a steel strip as described in any one of claims 1 to 6 is implemented.

10. A computer program product, characterized in that When the instructions in the computer program product are executed by a processor of an electronic device, the electronic device executes the method for controlling the thickness uniformity of a steel strip as described in any one of claims 1 to 6.

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