A method and system for improving the tail wave of a strip in a thin slab continuous casting and rolling line

Abstract

The application discloses a method and system for improving the tail wave of a strip steel of a thin slab continuous casting and rolling production line, and relates to a thin slab continuous casting and rolling device, and a control method thereof, which comprises the following steps: adjusting the flatness target value of the strip steel within a preset range; controlling the cooling of the rolling roller by adjusting the cooling water temperature and flow of the rolling roller, and adjusting the tail bending roller force; adjusting the negative crown value of the target rack working roller profile; opening the nearest preset number of spray headers at the outlet of the separation cooling device for cooling during the cooling process; controlling the coiling shaft to reduce the coiling tension of the tail section of the strip steel by a preset percentage; and controlling the coiling roller to reduce the coiling roller pressure to a preset threshold value. The application can effectively reduce the length of the tail wave of the strip steel, improve the turnover efficiency of the steel coil and the yield rate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel metallurgy, and in particular to a method and system for improving strip tail wavy in a thin slab continuous casting and rolling production line. BACKGROUND

[0002] Thin slab continuous casting and rolling is a major innovative technology developed successfully by the world steel industry in the late 1980s. The MCCR production line (The Multi-mode Continuous Casting & Rolling Plant) is the world's first third-generation thin slab continuous casting and rolling production line with flexible production mode. It integrates the latest technologies of thin slab continuous casting and hot rolling, adopts a brand-new production line layout, realizes single slab, half-endless, and endless three rolling modes, and covers a wider range of product specifications and has better product performance and surface quality.

[0003] The MCCR production line product thickness covers 0.8-12.7mm, and the endless mode rolling specifications are concentrated in 0.8-4mm. The MCCR production line product has good control in terms of strip temperature uniformity, crown, and surface quality. However, there is a problem of different lengths of wavy in the tail of the strip during the production process, most of which are in the range of 30-100m of the tail, and the wave height is concentrated in 15-18mm, and the wave distance is concentrated in 30-45cm. At present, the flatting method is adopted to solve the problem of wavy in the tail of the strip. Such a method increases the process cost, prolongs the delivery cycle, and also has a certain impact on the yield. Therefore, a method and system for improving the wavy in the tail of the strip in the thin slab continuous casting and rolling production line are needed. SUMMARY

[0004] The embodiments of the present application provide a method and system for improving the wavy in the tail of the strip in the thin slab continuous casting and rolling production line, which at least partially solves the technical problems of increasing the process cost, prolonging the delivery cycle, and reducing the yield by adopting the flatting method in the prior art, and achieves the technical effects of effectively reducing the length of the wavy in the tail of the strip, improving the coil turnover efficiency, and improving the yield.

[0005] In the first aspect, to solve the above technical problems, the embodiments of the present application provide the following technical solutions:

[0006] A method for improving the wavy in the tail of the strip in the thin slab continuous casting and rolling production line, comprising:

[0007] adjusting the flatness target value of the strip within a preset range;

[0008] controlling the cooling of the roll by adjusting the cooling water temperature and flow of the roll, and adjusting the tail bending roll force;

[0009] adjusting the negative crown value of the target stand working roll contour;

[0010] opening a preset number of spray headers closest to the exit of the laminar cooling device during the cooling process to cool the strip steel;

[0011] controlling the coiler spindle to reduce the coiling tension of the tail section of the strip steel by a preset percentage;

[0012] controlling the coiler roll to reduce the coiler roll pressure to a preset threshold value.

[0013] Optionally, the method further comprises:

[0014] placing the newly produced strip steel coil in the middle of the target area and arranging a plurality of cooled steel coils around the strip steel coil.

[0015] Optionally, the step of opening a preset number of spray headers closest to the exit of the laminar cooling device during the cooling process to cool the strip steel further comprises:

[0016] adjusting the number of header switches according to the change in coiling temperature during production; and cooling the strip steel using a preset number of spray headers closest to the exit of the laminar cooling device.

[0017] Optionally, after cooling the strip steel using a preset number of spray headers closest to the exit of the laminar cooling device, the method further comprises:

[0018] opening a preset number of spray headers closest to the exit of the laminar cooling device, detecting data of the cold tail coiling temperature, and obtaining an average temperature deviation based on the data;

[0019] verifying the influencing factors based on the average deviation and the deviation value of the strip steel entering the laminar cooling device.

[0020] Optionally, the step of verifying the influencing factors based on the average deviation and the deviation value of the strip steel entering the laminar cooling device further comprises:

[0021] arranging temperature sensors at the entrance of the laminar cooling device, obtaining a plurality of temperature values of the strip steel, and comparing each set of temperature value changes with the temperature value changes after the laminar cooling treatment; if the comparison meets a preset requirement, it is determined that the entrance temperature has an impact on the cooled temperature, otherwise, it does not.

[0022] Optionally, the step of controlling the coiler roll to reduce the coiler roll pressure to a preset threshold value further comprises:

[0023] controlling the coiler roll to reduce the coiler roll pressure to a preset threshold value in a step-by-step manner.

[0024] In a second aspect, a system for improving the wave in the tail of the strip steel of a thin slab continuous casting and rolling production line is provided, comprising:

[0025] The straightness adjustment module is used to adjust the straightness target value of the strip steel within a preset range;

[0026] The bending roll force adjustment module controls the cooling of the roll by adjusting the temperature and flow rate of the roll cooling water, and adjusts the bending roll force at the tail end.

[0027] The work roll profile adjustment module is used to adjust the negative convexity value of the work roll profile of the target frame;

[0028] The cooling module is used for layer cooling during the rolling process using a post-roll cooling method;

[0029] The winding tension control module is used to open the preset number of spray manifolds closest to the outlet of the delamination cooling equipment for cooling during the cooling process;

[0030] The adjustment module in the helper roller eye is used to control the helper roller to reduce the helper roller pressure to a preset threshold.

[0031] Optionally, the above system may also include:

[0032] The warehousing module is used to place the newly produced strip steel coils in the middle of the target area and to arrange multiple cooled steel coils around the strip steel coils.

[0033] Thirdly, an electronic device is provided, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to perform the steps corresponding to the method described in the first aspect.

[0034] Fourthly, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, performs the steps corresponding to the method described in the first aspect.

[0035] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0036] First, the impact of mid-section warping on straightness was mitigated by optimizing the target straightness value of the strip. The tail bending roll force was adjusted to improve strip straightness. The negative crown value of the work roll shape was adjusted to enhance the mill's crown control capability. The cooling mode was improved by changing the spray manifold from near the inlet to near the outlet, increasing the strip's air-cooling time and suppressing the formation of proeutectoid ferrite, thus improving product performance uniformity. Finally, the coiling tension and auxiliary coiling roll pressure were reduced to ensure good coil shape. This improved the situation of mid-section waviness at the strip tail, reducing the waviness height to below 5mm, while also lowering the rework rate, thereby improving coil turnover efficiency and yield. Attached Figure Description

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0038] Figure 1 A flow chart of a method for improving the wave of the tail of a strip in a thin slab continuous casting and rolling production line provided in the present application;

[0039] Figure 2 A valve opening number and coiling temperature relationship curve corresponding to the first coil 6230437110062 in the present application;

[0040] Figure 3 A spray header opening state schematic diagram corresponding to the first coil 6230437110062 in the present application;

[0041] Figure 4 A valve opening number and coiling temperature relationship curve corresponding to the second coil 6230437110063 in the present application;

[0042] Figure 5 A spray header opening state schematic diagram corresponding to the second coil 6230437110063 in the present application;

[0043] Figure 6 A valve opening number and coiling temperature relationship curve corresponding to the third coil 6230437110064 in the present application;

[0044] Figure 7 A spray header opening state schematic diagram corresponding to the third coil 6230437110064 in the present application;

[0045] Figure 8 A valve opening number and coiling temperature relationship curve corresponding to the fourth coil 6230437110065 in the present application;

[0046] Figure 9 A cold tail and coiling temperature relationship curve corresponding to the fifth coil 6230437110066 in the present application.

[0047] Figure 10 A spray header valve opening situation schematic diagram corresponding to the cold tail stable stage of the fifth coil 6230437110066 in the present application.

[0048] Figure 11 A cold tail and coiling temperature relationship curve corresponding to the sixth coil 6230437110067 in the present application.

[0049] Figure 12 The corresponding cold tail and coiling temperature relationship diagram of the seventh volume 6230437110068 in the present application.

[0050] Figure 13 The corresponding cold tail and coiling temperature relationship diagram of the seventh volume 6230437110068 in the present application.

[0051] Figure 14 The corresponding cold tail and coiling temperature relationship diagram of the seventh volume 6230437110068 in the present application.

[0052] Figure 15 The corresponding cold tail and coiling temperature relationship diagram of the seventh volume 6230437110068 in the present application.

[0053] Figure 16 The corresponding cold tail and coiling temperature relationship diagram of the seventh volume 6230437110068 in the present application.

[0054] Figure 17 The structure schematic diagram of a system for improving the wave in the tail of a thin slab continuous casting and rolling production line provided in the present application;

[0055] Figure 18 The structure schematic diagram of an electronic device provided in the present application. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0057] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0058] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0059] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "set", "set" should be understood broadly, for example, it can be fixedly set, or it can be detachably set, or integrally set; it can be mechanically set, or it can be electrically set; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0060] It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, and are not limitations of the technical solutions of the present application. In the case of no conflict, the technical features in the embodiments of the present application and the embodiments can be combined with each other.

[0061] The embodiments of the present application provide a method and system for improving the wave in the tail of the strip of the thin slab continuous casting and rolling production line, which improves the technical problems of increasing process cost, prolonging delivery cycle and reducing yield in the prior art by adopting flattening method, realizes the technical effects of effectively reducing the length of the tail wave of the strip, improving the coil turnover efficiency and yield.

[0062] The technical solutions of the embodiments of the present application are as follows to solve the above technical problems:

[0063] Firstly, the influence of the middle warping on the flatness is reduced by optimizing and adjusting the flatness target value of the strip; the flatness of the strip is improved by adjusting the tail bending roll force; the negative crown value of the work roll shape and the control ability of the mill crown are adjusted; the cooling mode is improved, that is, the original spray header close to the inlet position is replaced by the spray header close to the outlet position for cooling, the air cooling time of the strip is increased, the generation of proeutectoid ferrite is suppressed, and the performance uniformity of the product is improved. Finally, the coiling tension and the coiling roll pressure are reduced, so as to ensure good coil shape. Thus, the situation of the wave in the tail of the strip is improved, the wave height is reduced to below 5mm, the rework rate is reduced, and the coil turnover efficiency and yield are improved.

[0064] In the embodiments of the present application, a method for improving the wave in the tail of the strip of the thin slab continuous casting and rolling production line is provided as shown in Figure 1 The method comprises a thin slab continuous casting and rolling equipment, and the control method comprises steps S101-S106:

[0065] Step S101, adjusting the flatness target value of the strip within a preset range;

[0066] It should be noted that there is residual stress in the strip during rolling, which causes different rolling forces to be received, and when the residual stress accumulates to be large enough, it will cause the strip to warp to different degrees, and when the warping degree of the middle part of the strip exceeds the flatness range of the strip, it will cause the occurrence of the middle wave. Therefore, under the premise of ensuring the stability of rolling, the flatness target value is adjusted from the current 0IU to 10IU to reduce the influence of the middle warping on the flatness. IU is a unit for measuring flatness, that is, the wave type interval length.

[0067] Step S102, the cooling of the roll is controlled by adjusting the cooling water temperature and flow of the roll, and the tail bending roll force is adjusted;

[0068] It should be noted that the present embodiment adopts a hydraulic cylinder as a power to bend the roll, thereby controlling the crown and flatness of the strip. It can significantly improve the flatness of the strip, reduce the non-uniformity of the transverse thickness of the strip, and at the same time, increase the service life of the roll and improve the production rate of the rolling mill. It is found in actual production process that the bending roll force setting value of the strip tail middle wave steel coil is generally large, so the bending roll force is reduced to improve the strip middle wave problem. However, due to the excessive accumulation of thermal expansion of the roll in the later rolling stage, the ability to reduce the bending roll force is limited. Based on this, the cooling capacity of the roll is first improved, that is, the cooling capacity of the roll is improved by reducing the cooling water temperature of the roll and increasing the cooling water flow of the roll. After the cooling capacity is improved, the control ability of the bending roll is further released. Then the bending roll force is reduced, and the size of the F5 bending roll force when the virtual key cutting point passes through the F1 rolling mill is adjusted, and the specific adjustment data is shown in the following table.

[0069] Rolling force ACT value at the exit of the housing Drop ≤200KN No adjustment 200-400KN Drop 100KN >400KN Drop 200KN

[0070] Step S103, adjusting the negative crown value of the target mill stand work roll contour;

[0071] It should be noted that the purpose of adjusting the negative crown value is to improve the crown control ability of the rolling mill. The roll contour of F1 to F5 stands is adjusted, the OSR roll contour is used for F1 stand, and the negative crown of the finishing F1-F5 work roll contour is increased. The specific adjustment value is shown in the following table.

[0072] Roll shape Steel specification F1 F2 F3 F4 F5 Configuration 1 1250mm-1500mm -400±150 -240 -240 -280 -160 / conical roll Configuration 2 1120mm-1175mm -350 -200 -130 -150 -60

[0073] Step S104, opening the preset number of spray headers closest to the outlet of the separation cooling device for cooling during the cooling process;

[0074] It should be noted that the current layer cooling in the rolling process is cooled by the front cooling method, that is, the preset number of spray headers closest to the layer cooling equipment entrance are used for cooling. The strip steel enters the front cooling after leaving the F5 rack, resulting in uneven temperature distribution of the head and tail of the strip steel, thereby causing tail plate shape defects. However, the method of the embodiment can increase the air cooling time of the strip steel, inhibit the generation of proeutectoid ferrite, reduce the diffusion distance of carbon elements, avoid the generation of large block carbon-rich organization, improve the uniformity of the organization distribution of the hot-rolled product, increase the deformation amount of the austenite in the crystallization zone, and be beneficial to improving the uniformity of the product performance.

[0075] Step S105, control the coiler mandrel to reduce the winding tension of the tail section of the above strip steel by a preset percentage;

[0076] It should be noted that after the coiler mandrel reaches the "full rise" state, a tension control relationship is established between the strip steel and the coiler, and the coiler tension gradually decreases with the increase of the winding diameter, showing a "step tension" control mode. The current tail section tension is generally about 22KN. Through experimental data and historical data, it is known that the current tail section winding tension is still large, and the current winding tension is reduced by 10%.

[0077] Step S106, control the coiling roller to reduce the coiling roller pressure to a preset threshold.

[0078] It should be noted that after the tail of the strip steel is cut by the high-speed flying shear, the strip steel is guided into the mandrel by the coiling roller for winding. In order to ensure good winding shape, additional coiling rollers are needed to assist in winding the steel coil, so the coiling roller pressure will also affect the strip steel, especially the tail of the strip steel. The current coiling roller pressure is 55KN. Through experimental data and historical data, it is found that the current coiling roller pressure is too large, and the coiling roller pressure is reduced from 55KN to 40KN.

[0079] Further, the above method further comprises:

[0080] The newly produced strip steel coil is placed in the middle position of the target area, and a plurality of cooled steel coils are arranged around the strip steel coil.

[0081] It should be noted that the cooling effect of the strip steel coil is different in different positions in the warehouse. The newly produced steel coil is often placed in the edge near the window area to quickly cool the steel coil, which causes the cooling rate of the inner and outer diameters of the steel coil to be inconsistent, which can easily cause the steel coil to have different degrees of wave shape during the next unwinding process. Therefore, the embodiment places the offline steel coil in the middle position of each zone, and two steel coils are arranged around the four sides, forming a shape similar to a "ring cooling pit", which slows down the temperature drop rate of the steel coil and avoids the problem of inconsistent cooling rates of the inner and outer diameters of the steel coil.

[0082] Further, the step of opening the preset number of spray headers closest to the exit of the layer cooling device during the cooling process to cool the strip steel further comprises: adjusting the number of header switches according to the changes in the coiling temperature; and cooling the strip steel using the preset number of spray headers closest to the exit of the layer cooling device.

[0083] It should be noted that, in order to cool as uniformly as possible, the upper and lower sides of the spray headers are used for cooling, and the data of the strip steel and the rolling required are as shown in the following table.

[0084]

[0085] The control result of the coiling temperature can be judged by adjusting the heat exchange coefficient, a self-learning model can be set, and historical data and experimental data can be used for training and learning to obtain an adjustment model. The model is an existing technology on the MCCR production line, and will not be described here. The exchange coefficient update data are as shown in the following table:

[0086] Roll number Before update After update 6230437110062 0.9696 1.0327 6230437110063 1.0327 1.0611 6230437110064 1.0611 1.0798 6230437110065 1.0798 1.0798

[0087] The heat exchange coefficient of the first coil 6230437110062 is updated from 0.9696 to 1.0327, because the head temperature setting is too low, and the spray flow needs to be reduced in the next coil. The heat exchange coefficient is stable from the second coil 6230437110063 to the fourth coil 6230437110065, and the update range is small. The control result of the coiling temperature is consistent.

[0088] In addition, for the opening of the spray header, there is a certain deviation in the temperature model setting during the first trial rolling, so the control accuracy of the head is low. The lowest point of the head is 516℃, and the low temperature section length is 101m. The control range is stable at 570℃±20℃ after 379m. The relationship curve between the valve opening number and the coiling temperature of the first coil 6230437110062 is as shown in Figure 2 The opening state of the spray header is as shown in Figure 3 The relationship curve between the valve opening number and the coiling temperature of the second coil 6230437110063 is as shown in Figure 4 From the graph, it can be seen that the feedforward and feedback header control is stable during cooling, there is no header switching during the headless period, and the coiling temperature has a certain amplitude fluctuation, with a fluctuation range of 565-581℃. The corresponding opening state of the spray header is as shown in Figure 5 The relationship curve between the valve opening number and the coiling temperature of the third coil 6230437110064 is as shown in Figure 6 From the graph, it can be seen that the feedforward and feedback header control is stable during cooling, there is no header switching during the headless period, and the coiling temperature has a certain amplitude fluctuation, with a fluctuation range of 561-580℃. The corresponding opening state of the spray header is as shown inFigure 7 The fourth coil 6230437110065 valve opening number and coiling temperature relationship curve is shown in FIG. 23, wherein the fluctuation position is the header switching position, and the rectangular box is shown in the figure. Figure 8

[0089] It should be noted that, Figure 2 Figure 4 Figure 6 In the coordinate axis longitudinal coordinate of the coil temperature value, the horizontal coordinate is the length of the strip steel. Figure 8 Figure 3 Figure 5 In the coordinate axis longitudinal coordinate of the coil temperature value, the horizontal coordinate is the length of the strip steel. Figure 7 In the coordinate axis longitudinal coordinate of the coil temperature value, the horizontal coordinate is the length of the strip steel.

[0090] Further, after the above-mentioned strip steel is cooled by using the preset number of spray headers closest to the outlet of the above-mentioned layer cooling device, the above-mentioned method further comprises: opening the preset number of spray headers closest to the inlet of the above-mentioned layer cooling device, detecting the data of the cold tail coiling temperature, and obtaining the average temperature deviation according to the above-mentioned data; verifying the influencing factors according to the above-mentioned average deviation and the deviation value when the above-mentioned strip steel enters the layer cooling device.

[0091] It should be noted that the cold tail is the tail of the cold-rolled strip steel, and the function of the cold tail is simulated in the embodiment, so as to verify the cooling precision, that is, the preset number of spray headers closest to the inlet of the above-mentioned layer cooling device is opened. The specific parameters are shown in the following table.

[0092]

[0093] The cold tail control condition is shown in the following table:

[0094] Roll number Average temperature of the cold tail / ℃ Length of the cold tail / m Length of the transition section / m 6230437110066 508 81 7 6230437110067 497 88 13 6230437110068 486 95 13 6230437110069 486 102 12

[0095] The fifth coil 6230437110066 cold tail and coiling temperature relationship curve is shown in FIG. 24, and the valve opening condition of the header in the cold tail stable stage is shown in FIG. 25. Figure 9 The sixth coil 6230437110067 cold tail and coiling temperature relationship curve is shown in FIG. 26, and the valve opening condition of the header in the cold tail stable stage is shown in FIG. 27. Figure 10 The seventh coil 6230437110068 cold tail and coiling temperature relationship curve is shown in FIG. 28, and the valve opening condition of the header in the cold tail stable stage is shown in FIG. 29. Figure 11 The eighth coil 6230437110069 cold tail and coiling temperature relationship curve is shown in FIG. 30, and the valve opening condition of the header in the cold tail stable stage is shown in FIG. 31. Figure 12 The seventh coil 6230437110068 cold tail and coiling temperature relationship curve is shown in FIG. 28, and the valve opening condition of the header in the cold tail stable stage is shown in FIG. 29. Figure 13 The eighth coil 6230437110069 cold tail and coiling temperature relationship curve is shown in FIG. 30, and the valve opening condition of the header in the cold tail stable stage is shown in FIG. 31. Figure 14 The seventh coil 6230437110068 cold tail and coiling temperature relationship curve is shown in FIG. 28, and the valve opening condition of the header in the cold tail stable stage is shown in FIG. 29. Figure 15 The eighth coil 6230437110069 cold tail and coiling temperature relationship curve is shown in FIG. 30, and the valve opening condition of the header in the cold tail stable stage is shown in FIG. 31. Figure 16 The seventh coil 6230437110068 cold tail and coiling temperature relationship curve is shown in FIG. 28, and the valve opening condition of the header in the cold tail stable stage is shown in FIG. 29.

[0096] ​​​​​It should be noted that, Figure 9 , Figure 11 , Figure 13 and Figure 15 , the ordinate axis is the coiling temperature value, and the abscissa axis is the length of the strip. Figure 10 , Figure 12 , Figure 14 and Figure 16 , "0" represents the closed state of the spray header, and "1" represents the open state of the spray header.

[0097] The number of open valves in the cold tail stabilization stage is shown in the following table:

[0098]

[0099] From the control results, the number of open valves in the cold tail stabilization stage is the same, but the average temperature of the cold tail gradually decreases. The average temperature deviation of the fifth to seventh coils of the cold tail is 22℃. The average temperature of the strip entering the layer cooling equipment is 815℃, 814℃, 814℃, and 814℃, respectively, so the deviation is 1℃. Therefore, it can be verified that the average temperature of the strip entering the layer cooling equipment does not affect the temperature after cooling. It is speculated that this deviation is caused by changes in the site working condition or equipment precision. The specific implementation is: a temperature sensor is arranged at the entrance of the layer cooling equipment, and the temperature values of multiple strips are obtained; the temperature value change of each group is compared with the temperature value change after layer cooling treatment, and if it meets the preset requirement, it is determined that the inlet temperature affects the temperature after cooling, otherwise, it does not.

[0100] Further, the step of controlling the winding-up roller to reduce the winding-up roller pressure to the preset threshold value further comprises:

[0101] The winding-up roller is controlled to reduce the winding-up roller pressure to the preset threshold value in a step control manner.

[0102] It should be noted that the step control (AJC) can prevent the impact on the winding-up roller, prevent the strip head from being scratched, reduce the winding noise, and reduce the vibration during winding.

[0103] Based on the same inventive concept, the embodiments of the present application provide a system for improving the wave in the tail of the thin slab continuous casting and rolling production line, as shown in Figure 17 , comprising:

[0104] The flatness adjustment module is used to adjust the flatness target value of the strip within a preset range.

[0105] The bending roller force adjustment module adjusts the cooling of the rolling mill by adjusting the cooling water temperature and flow of the rolling mill, and adjusts the tail bending roller force.

[0106] The working roll shape adjustment module is configured to adjust a negative crown value of a target stand working roll shape.

[0107] The cooling module is configured to adopt a post-cooling mode to perform layer cooling during the rolling process.

[0108] The coiling tension control module is configured to open a preset number of spray headers closest to the exit of the layer cooling device to perform cooling during the cooling process.

[0109] The coiler eye adjustment module is configured to control the coiler to reduce the coiler pressure to a preset threshold.

[0110] Further, the system further comprises:

[0111] The warehousing module is configured to place the newly produced strip steel coil in a middle position of the target area, and to arrange a plurality of cooled steel coils around the strip steel coil.

[0112] Based on the same inventive concept, the embodiment provides an electronic device, as shown in the accompanying drawings, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement a method for improving the wave in the tail of the strip steel of the thin slab continuous casting and rolling production line. Figure 18

[0113] Based on the same inventive concept, the embodiment provides a computer readable storage medium, which stores a computer program, characterized in that the program is executed by a processor to implement a method for improving the wave in the tail of the strip steel of the thin slab continuous casting and rolling production line.

[0114] Those skilled in the art will understand that embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage devices, etc.) containing computer-usable program code.

[0115] The present application is described with reference to the flowcharts and / or block diagrams of the methods, apparatus (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, as well as a combination of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing apparatus to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing apparatus produce a device that implements the flowcharts and / or block diagrams. Figure 1 ​one or more processes and / or blocks Figure 1 an apparatus for performing functions specified in one or more blocks.

[0116] While the preferred embodiments of the application have been described, additional variations and modifications can be made to the preferred embodiments by those of skill in the art once they have the benefit of the present disclosure. Therefore, the appended claims are intended to encompass within their scope all possible variations and modifications of the preferred embodiments. The preferred embodiments of the application described herein are not meant to be limiting, but rather are meant to be illustrative only. It is therefore desired to be protected in the broadest scope of the appended claims to encompass all changes and modifications of the preferred embodiments of the application.

[0117] It is apparent that those skilled in the art can make modifications and variations to the application without departing from the spirit and scope of the application. Accordingly, it is intended to be included within the scope of the application that all such modifications and variations are intended to be within the scope of the claims and their equivalents.

Claims

1. A method of improving the wave in the tail of strip in a thin slab continuous casting and rolling line, comprising a thin slab continuous casting and rolling plant, characterized in that, The method comprises: adjusting the flatness target value of the strip steel within a preset range; controlling the cooling of the roll by adjusting the temperature and flow of the roll cooling water, and adjusting the tail bending force; wherein if the bending force ACT value at the exit of the stand is ≤200KN, the tail bending force is not adjusted; if the bending force ACT value at the exit of the stand is between 200-400KN, the tail bending force is adjusted to decrease by 100KN; if the bending force ACT value at the exit of the stand is >400KN, the tail bending force is adjusted to decrease by 200KN; adjusting the negative crown value of the target stand working roll contour; opening the nearest preset number of spray headers at the exit of the separation cooling device during the cooling process for cooling; controlling the coiler spindle to reduce the coiling tension of the tail section of the strip steel by a preset percentage; controlling the coiler roll to reduce the coiler roll pressure to a preset threshold value.

2. The method of claim 1, wherein, The method further comprises: placing the newly produced strip steel coil in the middle position of the target area, and arranging a plurality of cooled steel coils around the strip steel coil.

3. The method of claim 1, wherein, The step of opening the nearest preset number of spray headers at the exit of the separation cooling device during the cooling process for cooling further comprises: adjusting the number of header switches according to the change of the coiling temperature during production; and cooling the strip steel using the nearest preset number of spray headers from the exit of the separation cooling device.

4. The method of claim 3, wherein, After cooling the strip steel using the nearest preset number of spray headers from the exit of the separation cooling device, the method further comprises: opening the nearest preset number of spray headers from the entrance of the separation cooling device, detecting a plurality of cold tail coiling temperature data, and obtaining an average temperature deviation according to the data; verifying the influencing factors according to the average temperature deviation and the deviation value when the strip steel enters the separation cooling device.

5. The method of claim 4, wherein, The step of verifying the influencing factors according to the average temperature deviation and the deviation value when the strip steel enters the separation cooling device further comprises: arranging temperature sensors at the entrance of the separation cooling device where the strip steel enters, and obtaining a plurality of temperature values of the strip steel; comparing each set of temperature value change amount and temperature value change amount after the separation cooling treatment, and if it meets the preset requirement, it is determined that the inlet temperature has an impact on the temperature after cooling, otherwise, it does not.

6. The method of claim 1, wherein, The step of controlling the coiler roll to reduce the coiler roll pressure to a preset threshold value further comprises: controlling the coiler roll to reduce the coiler roll pressure to a preset threshold value in a step-by-step manner.

7. A system for improving the tail wave of a thin slab continuous casting and rolling production line, characterized in that: a flatness adjustment module for adjusting the flatness target value of the strip steel within a preset range; a bending force adjustment module for controlling the cooling of the roll by adjusting the temperature and flow of the roll cooling water, and adjusting the tail bending force; wherein if the bending force ACT value at the exit of the stand is ≤200KN, the tail bending force is not adjusted; if the bending force ACT value at the exit of the stand is between 200-400KN, the tail bending force is adjusted to decrease by 100KN; if the bending force ACT value at the exit of the stand is >400KN, the tail bending force is adjusted to decrease by 200KN; a working roll contour adjustment module for adjusting the negative crown value of the target stand working roll contour; A cooling module for opening a preset number of spray headers closest to the off-gauge cold mill outlet for cooling during the cooling process; A coiling tension control module for controlling the coiling tension of the tail section of the strip steel to be reduced by a preset percentage; A coiler pressure adjustment module for controlling the coiler pressure to be reduced to a preset threshold.

8. The system of claim 7, wherein, The system further comprises: A storage module for placing the newly produced strip steel coil in the middle of the target area and setting a plurality of cooled steel coils around the strip steel coil.

9. An electronic device, comprising: The electronic device comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor executes the computer program to implement the method of any one of claims 1-6.

10. A computer-readable storage medium having stored thereon a computer program, characterized in that, The program is executed by the processor to implement the method of any one of claims 1-6.

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