A method for calculating head and tail roll gap deviation in a slack state

Abstract

The application discloses a head-tail roll gap deviation calculation method in a lost state, and belongs to the technical field of metallurgical automation control. The method comprises the following steps: calculating a current head roll gap deviation pre-control value before a strip passes through; adjusting the roll gap deviation of the current mill on both sides in real time according to the actual rolling force before the next mill bites the steel; after the next mill bites the steel, the current mill cancels the adjustment amount of the roll gap deviation on both sides; after the previous mill throws the steel, the roll gap deviation of the current mill is calculated in real time after the previous mill throws the steel; and the roll gap deviation pre-control value is executed to the next strip head roll gap deviation pre-control value after the current mill throws the steel. The application solves the problems of head deviation in the strip passing process and tail deviation when the strip is thrown, and has a positive significance for improving the stability of the strip passing and throwing.

Description

Technical Field

[0001] This invention relates to the field of metallurgical automation control technology, and in particular to a method for calculating the head and tail roll gap deviation under tension loss conditions. Background Technology

[0002] In the field of plate rolling, especially in hot strip finishing mills, the problem is particularly pronounced. During the strip threading at the head and strip ejection at the tail, the strip lacks tension between the two mills, resulting in tension loss at these points. This easily leads to strip deviation at the head and tail slippage at the tail. The main cause of this problem is the inconsistent thickness of the strip at the mill's inlet and outlet, causing deviation. Several factors influence this issue, including the current rolling force stiffness on both sides of the mill, the upstream stand's rolling force deviation, and the plasticity of the strip within the current stand. Therefore, a comprehensive analysis and calculation of the upstream mill pressure deviation, the stiffness deviation between the upstream and current stands during rolling, and the plasticity of the strip within the current stand are crucial for addressing this problem. This analysis provides a roll gap deviation compensation mechanism, which is significant for resolving such issues.

[0003] Currently, there is no existing technology that can calculate the head and tail roll gap deviation under untension conditions to solve problems such as head deviation and tail swing when the strip is thrown during the strip threading process. Summary of the Invention

[0004] This invention provides a method for calculating the head and tail roll gap deviation under untensioned conditions, in order to solve the technical problems of head deviation and tail throwing during strip threading.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] On one hand, the present invention provides a method for calculating the head and tail roll gap deviation under tension loss conditions, including:

[0007] Calculate the pre-control value of the roller gap deviation before the belt is threaded onto the current frame head;

[0008] Before the next stand bites the steel, the roll gap deviation on both sides of the current stand is adjusted in real time according to the actual rolling force change. After the next stand bites the steel, the adjustment amount of the roll gap deviation on both sides of the current stand is cancelled.

[0009] After the previous stand throws steel, calculate the real-time adjustment amount of the roll gap deviation of the current stand after the tail of the previous stand throws steel.

[0010] After the current strip is thrown out, the roll gap deviation pre-control value is applied to the roll gap deviation pre-control value of the head of the next strip.

[0011] Further, the calculation of the pre-control value of the roll gap deviation before the current frame head is threaded includes:

[0012] The thickness of the strip head at the current stand is calculated based on the predicted rolling force at the current stand's strip head, the mill stiffness on both sides corresponding to the predicted rolling force at the current stand's strip head, the real-time average roll gap at the current stand, the zero-adjustment rolling force at the current stand, and the thickness compensation value at the exit of the strip head at both sides of the current stand.

[0013] Based on the calculated exit thickness of the strip head on both sides of the current stand, the mill stiffness on both sides corresponding to the predicted rolling force, and the plasticity of the strip head, the pre-control value of the roll gap deviation before strip threading at the current stand head is calculated.

[0014] Furthermore, the formula for calculating the thickness of the strip exit on both sides of the current frame head is as follows:

[0015]

[0016]

[0017] Among them, h dr This indicates the current thickness of the strip head drive side exit of the frame; h op Indicates the current strip head exit thickness on the operating side of the stand; S indicates the current real-time average roll gap of the stand; P s P0 represents the predicted rolling force at the strip head of the current stand; M represents the zero-adjustment rolling force of the current stand; dr This indicates the mill drive-side stiffness corresponding to the predicted rolling force at the strip head of the current stand; M op This indicates the mill operating side stiffness corresponding to the predicted rolling force at the strip head of the current stand; O dr This indicates the current thickness compensation value at the exit of the strip head drive side of the machine frame, with a range of 0 to 0.5. op This indicates the current thickness compensation value of the strip head operating side exit of the machine frame, and its value ranges from 0 to 0.5.

[0018] Furthermore, the calculation formula for the pre-control value of the roll gap deviation before the belt is threaded at the head of the current frame is:

[0019] S do =S o -S d

[0020]

[0021]

[0022] Among them, S do This represents the pre-control value of the roll gap deviation before the tape is threaded at the head of the current frame. It is used to pre-adjust the roll gap deviation before the tape is threaded at the head of the current frame. During pre-adjustment, the roll gap setpoint on the drive side is increased by S.do The operating side roller gap is given by subtracting S. do S o This indicates the pre-adjustment amount of the roll gap on the operating side of the strip head of the current stand; S d This indicates the pre-adjustment amount of the roll gap on the drive side of the strip head of the machine frame; h dr This indicates the current thickness of the strip head drive side exit of the frame; h op Indicates the current strip head operating side exit thickness of the frame; M dr This indicates the mill drive-side stiffness corresponding to the predicted rolling force at the strip head of the current stand; M op This indicates the mill operating side stiffness corresponding to the predicted rolling force at the strip head of the current stand; K indicates the plasticity at the strip head rolled on the current stand; G m This represents the gain coefficient for roll gap adjustment, with a value ranging from 0.2 to 1.5; S f This represents the plasticity correction factor for the rolled piece, and its value ranges from 0.1 to 1.

[0023] Furthermore, before the subsequent stand bites the steel, the roll gap deviation on both sides of the current stand is adjusted in real time according to the actual rolling force change; after the subsequent stand bites the steel, the adjustment of the roll gap deviation on both sides of the current stand is cancelled, including:

[0024] Before the next stand bites the steel, the real-time adjustment amount of the roll gap deviation on both sides of the current stand is calculated based on the real-time exit thickness on both sides of the strip head of the current stand, the real-time rolling force of the current stand mill, the real-time stiffness of both sides of the current stand as the rolling force changes, and the plasticity of the rolled piece of the current stand as the rolling force changes.

[0025] Wait for the next frame to engage with the steel, and establish tension between the current frame and the next frame;

[0026] Once the tension between the current stand and the next stand is established, the recovery time of the strip head roll gap deviation adjustment is calculated using the actual linear speed of the rolls in the current stand, the set rolling linear speed of the rolls, and the time correction coefficient. Based on the recovery time of the strip head roll gap deviation adjustment, the current stand cancels the adjustment of the roll gap deviation on both sides of the mill.

[0027] Furthermore, the calculation formula for the real-time adjustment of the roll gap deviation on both sides of the current stand rolling mill is as follows:

[0028] S dou =S ou -S du

[0029]

[0030]

[0031]

[0032]

[0033] Among them, S dou This indicates the real-time adjustment amount of the roll gap deviation on both sides of the current mill stand. It is used to adjust the roll gap deviation on both sides of the current mill stand in real time before the next stand bites the steel. During adjustment, the drive-side roll gap setpoint is increased by S. dou The operating side roller gap is given by subtracting S. dou S ou This indicates the real-time adjustment amount of the roll gap on the operating side of the strip head of the current stand; S du This indicates the real-time adjustment amount of the roll gap on the drive side of the strip head of the machine frame; h dru This indicates the real-time exit thickness of the strip head drive side of the current frame; h opu This indicates the real-time exit thickness of the strip head on the operating side of the current frame; M dru This represents the real-time stiffness of the current stand drive side as the rolling force changes; M opu This represents the real-time stiffness of the operating side of the current stand as a function of the rolling force; K u This indicates the change in plasticity of the workpiece under rolling force at the current stand; G m This represents the gain coefficient for roll gap adjustment, with a value ranging from 0.2 to 1.5; S f The value represents the plasticity correction factor for the rolled piece, ranging from 0.1 to 1; S represents the real-time average roll gap of the current stand; P0 represents the zero-adjustment rolling force of the current stand; O dr This indicates the current thickness compensation value at the exit of the strip head drive side of the machine frame, with a range of 0 to 0.5. op This indicates the current strip head exit thickness compensation value on the operating side of the frame, with a range of 0 to 0.5; P u This indicates the real-time rolling force of the current stand rolling mill.

[0034] Furthermore, the formula for calculating the recovery time of the strip head roll gap deviation adjustment is as follows:

[0035] t o =V u ÷V s ×K v

[0036] Among them, t o This indicates the recovery time for the strip head roll gap deviation adjustment, which is the time to cancel the roll gap deviation adjustment on both sides of the mill after the next stand bites the strip; V u V represents the actual linear velocity of the rolls on the current stand; s Indicates the current stand's set rolling speed; K v This represents the time correction factor, which ranges from 0.1 to 1.5.

[0037] Furthermore, after the previous stand throws steel, the real-time adjustment amount of the roll gap deviation of the current stand is calculated after the tail of the previous stand throws steel, including:

[0038] The rolling force on both sides of the tail of the strip before the steel is thrown out of the stand before sampling;

[0039] The entry thickness of the strip at both sides of the current stand is calculated based on the real-time average roll gap of the previous stand, the real-time rolling force of the previous stand, the mill stiffness corresponding to the real-time rolling force of the previous stand, the real-time average roll gap of the current stand, the zero-adjustment rolling force of the current stand, and the strip tail entry thickness compensation value of the current stand.

[0040] Based on the entry thickness of the strip at both sides of the tail of the current stand, the stiffness of both sides corresponding to the real-time rolling force, and the plasticity of the tail of the rolled piece, calculate the real-time adjustment amount of the roll gap deviation of the current stand after the strip is thrown out at the tail of the previous stand.

[0041] Furthermore, the rolling force on both sides of the tail of the strip before the steel is thrown out of the stand before sampling includes:

[0042] The length of the strip tail before the sample is thrown from the previous stand is calculated based on the stand spacing, the corrected strip tail length factor, the inlet thickness of the previous stand, and the inlet thickness of the current stand. The formula is as follows:

[0043] L t =h÷H×l x ×l k

[0044] Among them, L t The length of the strip tail before the previous stand was sampled is indicated by: h; the thickness of the strip at the current stand entrance is indicated by: H; the thickness of the strip at the previous stand entrance is indicated by: l. x Indicates the distance between the two racks; l k This represents the correction factor for the tail length of the strip, with a value ranging from 1 to 1.3.

[0045] Based on the calculated L t In L t The rolling force on both sides of the tail of the strip before the steel is thrown out of the previous stand within the sampling range;

[0046] The formula for calculating the thickness of the strip entering the inlet on both sides of the current frame is:

[0047]

[0048]

[0049] Among them, h rdr Indicates the current thickness of the strip at the drive side inlet of the frame; h rop This indicates the thickness of the current strip tail operating side inlet of the frame; S -1 P represents the real-time average roll gap of the previous stand;u-1 M represents the real-time rolling force of the previous stand rolling mill; dru-1 Indicates the real-time stiffness of the drive side of the preceding stand as a function of rolling force; M opu-1 This indicates the real-time stiffness of the operating side of the previous stand as a function of rolling force; O drt This indicates the current thickness compensation value at the drive side inlet of the strip tail section of the frame, with a value range of 0 to 1. opt This indicates the current thickness compensation value at the operating side inlet of the strip tail of the frame, with a value range of 0 to 1; P 0-1 This indicates the zero-adjustment rolling force of the previous stand.

[0050] Furthermore, based on the entry thickness of the strip at both ends of the current stand, the stiffness of both sides corresponding to the real-time rolling force, and the plasticity of the strip tail, the real-time adjustment amount of the roll gap deviation of the current stand after the strip is thrown out at the tail of the previous stand is calculated, including:

[0051] The current length of the tail strip of the frame is l y The sampled strip thickness from both sides of the previous stand is divided into n equal parts. The thicknesses at the exit points on both sides of the previous stand are also divided into n parts. A storage interval is defined, and the n parts of the strip thickness at the exit points on both sides of the previous stand are stored sequentially along the length direction into the storage interval. Where, l y =l x ×l k Among them, l x Indicates the distance between the two racks; l k This represents the correction factor for the tail length of the strip, with a value ranging from 1 to 1.3; n ranges from 20 to 500.

[0052] After the previous stand discards the strip, the current stand sequentially reads the exit thickness on both sides of the strip tail from the previous stand within the storage range. Combining this with the real-time rolling force corresponding to the stiffness on both sides and the plasticity of the strip tail, the current stand calculates the real-time adjustment amount of the roll gap deviation after the previous stand discards the strip. The formula is as follows:

[0053] S dot =S ot -S dt

[0054]

[0055]

[0056] Among them, S dot This indicates the real-time adjustment amount of the roll gap deviation for the current stand after the previous stand has thrown steel at the tail end. It is used to adjust the roll gap deviation on both sides of the current stand in real time after the previous stand has thrown steel. During adjustment, the drive-side roll gap setpoint is increased by S. dot The operating side roller gap is given by subtracting S. dot S otThis indicates the real-time adjustment amount of the roll gap on the current stand's operating side after the previous stand's steel-throwing process; S du This indicates the real-time adjustment amount of the roller gap on the drive side of the current stand after the previous stand has finished throwing steel; h rdr h is the current thickness of the strip at the drive side inlet of the frame. rop M represents the thickness of the current frame strip tail operating side inlet; dru M represents the real-time stiffness of the current stand drive side as a function of rolling force; opu K represents the real-time stiffness of the current stand operating side as a function of rolling force. u The plasticity of the workpiece under rolling force changes with the current stand; G m S is the gain coefficient for roll gap adjustment, with a value ranging from 0.2 to 1.5; f This is the plasticity correction factor for the rolled piece, and its value ranges from 0.1 to 1.

[0057] In another aspect, the present invention also provides an electronic device comprising a processor and a memory; wherein the memory stores at least one instruction, which is loaded and executed by the processor to implement the above-described method.

[0058] In another aspect, the present invention also provides a computer-readable storage medium storing at least one instruction, which is loaded and executed by a processor to implement the above-described method.

[0059] The beneficial effects of the technical solution provided by this invention include at least the following:

[0060] The present invention provides a method for calculating the head and tail roll gap deviation under unstressed conditions. This method calculates the roll gap deviation based on factors such as inconsistent stiffness on both sides of the mill. It calculates the exit thickness of the strip on both sides under multiple factors including inconsistent stiffness on both sides of the mill, pressure deviation on both sides before the previous stand's strip ejection, and the plasticity of the rolled piece. The roll gap is then calculated back based on the exit thickness and adjusted in real time. The exit thickness is calculated based on the rolling force deviation of the previous stand, and the roll gap is calculated back based on stiffness, plasticity, and other data. Furthermore, the thickness difference "translation" concept is used to "migrate" the thickness deviation on both sides of the tail of the previous stand to the current stand for pre-control. Thus, by pre-controlling and real-time adjusting the roll gap deviation on both sides of the current mill during strip threading and tail ejection, the problems of head deviation during strip threading and tail-wagging during strip ejection are solved, which has a positive impact on improving the stability of strip threading and ejection. Attached Figure Description

[0061] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0062] Figure 1 This is a flowchart illustrating the method for calculating the head and tail roll gap deviation under tension loss conditions provided in an embodiment of the present invention.

[0063] Figure 2 This is a detailed flowchart of the head and tail roll gap deviation calculation method provided in the embodiment of the present invention under the condition of tension loss;

[0064] Figure 3 This is a system block diagram of the electronic device provided in the embodiments of the present invention. Detailed Implementation

[0065] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0066] First, it should be noted that in the embodiments of the present invention, the words "exemplarily," "for example," etc., are used to indicate that they are examples, illustrations, or descriptions. Any embodiment or design scheme described as "exemplary" in the present invention should not be construed as being more preferred or advantageous than other embodiments or design schemes. Specifically, the use of the term "exemplarily" is intended to present the concept in a specific manner. Furthermore, in the embodiments of the present invention, the meaning expressed by "and / or" can be both, or it can be either one or the other.

[0067] First Embodiment

[0068] This embodiment provides a method for calculating the head and tail roll gap deviation under untensioned conditions. The theoretical thickness deviation of the strip on both sides after it bites in is calculated by using the predicted rolling force, lateral stiffness, and mill plasticity before the strip enters the current stand. Then, the roll gap deviation pre-control amount is calculated based on this deviation. Before the current mill throws the strip, the theoretical thickness deviation of the strip entering the current mill is calculated based on the actual rolling force on both sides and the lateral stiffness of the upstream stand for a period before the strip is thrown. Based on this thickness deviation and relevant data from the current stand, such as the actual rolling force on both sides, lateral stiffness, and workpiece plasticity, the roll gap deviation adjustment amount for the current stand is calculated.

[0069] The execution flow of this method is as follows: Figure 1 As shown, it includes the following steps:

[0070] S1, calculate the pre-control value of the roller gap deviation before the current frame head is threaded;

[0071] Specifically, such as Figure 2 As shown, in this embodiment, S1 includes the following steps:

[0072] S11. Calculate the exit thickness of the strip head on both sides of the current stand based on the predicted rolling force of the strip head on the current stand, the mill stiffness on both sides corresponding to the predicted rolling force of the strip head on the current stand, the real-time average roll gap of the current stand, the zero-adjustment rolling force of the current stand, and the exit thickness compensation value of the strip head on both sides of the current stand.

[0073] The formula for calculating the thickness of the strip exit on both sides of the current frame head is as follows:

[0074]

[0075] Among them, h dr This indicates the current thickness of the strip at the drive side exit of the frame, h. op The current strip head exit thickness on the operating side of the stand is indicated by P; S represents the current real-time average roll gap of the stand, both in mm. s P0 represents the current stand's predicted rolling force, and P0 represents the current stand's zero-adjustment rolling force; both are in tons (tons). dr M represents the transmission side stiffness under the predicted rolling force of the current stand. op This indicates the operating side stiffness under the current stand's predicted rolling force, in ton / mm; O dr This indicates the current thickness compensation value at the exit of the strip head drive side of the frame, ranging from 0 to 0.5. op This indicates the current thickness compensation value of the strip head operating side exit of the machine frame, ranging from 0 to 0.5, with the unit being mm.

[0076] S12, calculate the pre-control value of the roll gap deviation before strip threading at the current stand head based on the calculated exit thickness on both sides of the current stand strip head, the mill stiffness on both sides corresponding to the predicted rolling force, and the plasticity of the rolled piece head.

[0077] The formula for calculating the pre-control value of the roll gap deviation at the head of the current frame is as follows:

[0078]

[0079] Among them, S do This represents the pre-control value of the deviation at the head of the current frame roll gap before belt threading. In final application, this deviation is added to the drive-side roll gap setpoint, and subtracted from the operation-side roll gap setpoint. S o S represents the pre-adjustment amount of the roll gap on the operating side of the strip head of the current stand. d Indicates the pre-adjustment of the roll gap on the head drive side of the strip at the current stand, in mm; K indicates the plasticity of the rolled piece at the current stand, in ton / mm; G m This indicates the gain coefficient for calculating the roll gap adjustment based on the strip exit thickness, with a value ranging from 0.2 to 1.5; S f This represents the plasticity correction factor for the rolled piece, with a value ranging from 0.1 to 1.

[0080] S2, before the next stand bites the steel, the roll gap deviation on both sides of the current stand is adjusted in real time according to the actual rolling force change. After the next stand bites the steel, the adjustment amount of the roll gap deviation on both sides of the current stand is cancelled.

[0081] Specifically, such as Figure 2 As shown, in this embodiment, S2 includes the following steps:

[0082] S21, waiting for the rolling mill to bite the steel;

[0083] S22. After the rolling mill bites the steel, the real-time adjustment amount of the roll gap deviation on both sides of the current stand is calculated based on the real-time exit thickness of the strip head on both sides of the current stand, the real-time rolling force of the current stand, the real-time stiffness of both sides of the current stand as the rolling force changes, and the plasticity of the rolled piece on the current stand as the rolling force changes.

[0084] The formula for calculating the real-time adjustment of the roll gap deviation on both sides of the current stand is as follows:

[0085] S dou =S ou -S du ,

[0086]

[0087] Among them, S dou This indicates the real-time adjustment amount of the roll gap deviation on both sides of the current mill stand before the next stand bites the steel. In its final application, this deviation is added to the roll gap setpoint on the drive side and subtracted from the roll gap setpoint on the operating side. S ou This indicates the real-time adjustment amount of the roll gap on the operating side of the strip head of the current stand, S. du This indicates the real-time adjustment amount of the roll gap on the drive side of the strip head of the machine frame, h. dru This indicates the real-time exit thickness of the strip head drive side of the current frame, h. opu This indicates the real-time exit thickness of the strip head on the operating side of the current frame, in mm; M dru M represents the real-time stiffness of the current frame drive side as the rolling force changes. opu K represents the real-time stiffness of the operating side of the current stand as the rolling force changes. u This indicates the plasticity of the workpiece being rolled on the current stand as a function of rolling force, with units of ton / mm; P u This indicates the real-time rolling force of the current mill stand, measured in tons.

[0088] S23, wait for the next frame to bite the steel, and establish tension between the current frame and the next frame;

[0089] S24. After the tension between the current stand and the next stand is established, the recovery time of the strip head roll gap deviation adjustment is calculated using the actual linear speed of the rolls in the current stand, the set rolling linear speed of the rolls, and the time correction coefficient. Based on the recovery time of the strip head roll gap deviation adjustment, the current stand cancels the adjustment of the roll gap deviation on both sides of the mill.

[0090] The formula for calculating the recovery time of the strip head roll gap deviation adjustment is as follows:

[0091] t o =V u ÷V s ×K v

[0092] Among them, t o This indicates the time, in seconds, after the subsequent frame bites the steel, to cancel the adjustment for the roll gap deviation in the head tension section; V u V represents the actual linear velocity of the rolls on the current stand; s This indicates the current set rolling line speed of the mill stand rolls, in m / s; K v This represents the time correction factor, with a value ranging from 0.1 to 1.5.

[0093] S3, after the previous stand throws steel, calculate the real-time adjustment amount of the roll gap deviation of the current stand after the tail of the previous stand throws steel;

[0094] Specifically, in this embodiment, such as Figure 2 As shown, S3 above includes the following steps:

[0095] S31, the rolling force on both sides of the tail of the strip before the steel is thrown out of the stand before sampling;

[0096] Furthermore, the rolling force on both sides of the tail of the strip before the steel is thrown out of the stand before sampling includes:

[0097] S311, based on the frame spacing, the corrected strip tail length coefficient, the previous frame inlet thickness, and the current frame inlet thickness, calculate the strip tail length before the previous frame's strip throwing, using the following formula:

[0098] L t =h÷H×l x ×l k

[0099] Among them, L t The length of the strip tail before the previous stand's strip throwing is represented by h, the strip inlet thickness of the current stand is represented by H, and the strip inlet thickness of the previous stand is represented by l. x This indicates the distance between two racks, in mm; k This represents the correction factor for the tail length of the strip, with a value ranging from 1 to 1.3.

[0100] S312, in L t The rolling force on both sides of the tail of the strip before the steel is thrown out of the previous stand within the sampling range.

[0101] S32, calculate the entry thickness of the strip at both sides of the current stand based on the real-time average roll gap of the previous stand, the real-time rolling force of the previous stand, the mill stiffness corresponding to the real-time rolling force of the previous stand, the real-time average roll gap of the current stand, the zero-adjustment rolling force of the current stand, and the strip tail entry thickness compensation value of the current stand.

[0102] The formula for calculating the thickness of the inlet on both sides of the strip tail of the current frame is as follows:

[0103]

[0104] Among them, h rdr This indicates the current thickness of the strip at the drive side inlet of the frame, h. rop S represents the current thickness of the strip at the operating side inlet of the frame. -1 This indicates the real-time average roll gap of the previous stand, in mm; P u-1 P represents the real-time rolling force of the previous stand mill, in tons. 0-1 This indicates the zero-adjustment rolling force of the previous stand, in tons (tons); M dru-1 M represents the real-time stiffness of the drive side of the preceding stand as the rolling force changes. opu-1 This indicates the real-time stiffness of the operating side of the previous stand as a function of rolling force, expressed in ton / mm; O drt This indicates the current thickness compensation value at the drive side inlet of the strip tail section of the frame, ranging from 0 to 1. opt This indicates the current thickness compensation value at the operating side entrance of the strip tail of the frame, ranging from 0 to 1, with the unit being mm.

[0105] S33, based on the entry thickness of the strip at both sides of the tail of the current stand, the stiffness of both sides corresponding to the real-time rolling force, and the plasticity of the tail of the rolled piece, calculate the real-time adjustment amount of the roll gap deviation of the current stand after the strip is thrown at the tail of the previous stand.

[0106] Furthermore, in this embodiment, S33 includes the following steps:

[0107] S331, the current length of the strip at the tail of the frame l y The program's runtime cycle is divided into n equal parts, and the sampled data from the previous frame's steel throwing L is used to... t The thickness of the strip exiting on both sides of the segment is also divided into n parts, and a storage interval is defined. The n parts of the strip exiting thickness on both sides of the previous stand are stored sequentially into the storage interval along the length direction; where l y =l x ×l k Among them, l y The unit is mm; lx Indicates the distance between the two racks; l k This represents the correction factor for the tail length of the strip, with a value ranging from 1 to 1.3; n ranges from 20 to 500.

[0108] S332, after the previous stand throws out the strip, the current stand begins to sequentially read the exit thickness on both sides of the strip tail from the previous stand within the storage range. Combining this with the real-time rolling force corresponding to the stiffness on both sides and the plasticity of the strip tail, the current stand calculates the real-time adjustment amount of the roll gap deviation after the previous stand throws out the strip. The formula is as follows:

[0109] S dot =S ot -S dt ,

[0110] Among them, S dot This indicates the real-time adjustment amount of the roll gap deviation on both sides of the current mill stand after the previous stand's steel ejection. In its final application, this deviation is added to the drive-side roll gap setpoint, and subtracted from the operating-side roll gap setpoint; S ot This indicates the real-time adjustment amount of the roll gap on the current stand's operating side after the previous stand's steel-throwing process; S du This indicates the real-time adjustment amount of the roller gap on the drive side of the current frame after the steel is thrown on the previous frame, and the unit is mm.

[0111] S4, after the current frame throws the steel, the roll gap deviation pre-control value is executed to the roll gap deviation pre-control value of the head of the next strip.

[0112] The following describes the application of the head and tail roll gap deviation calculation method of the present invention under untensioned conditions to a hot rolling finishing mill, taking the F2 finishing mill as an example, to further illustrate the implementation process of the head and tail roll gap deviation calculation method of the present invention under untensioned conditions. Specifically, in this application scenario, the method of the present invention is operated according to the following steps:

[0113] (1) Based on the current predicted rolling force of 2650 tons for the strip head of the stand, the corresponding mill drive side stiffness is 620 ton / mm, the operating side stiffness is 600 ton / mm, the current real-time average roll gap of the mill is 12 mm, the zero-adjustment rolling force is 1500 tons, and the exit thickness compensation values ​​of the drive side and the operating side are both 0, the calculated exit thickness of the strip head on the drive side is 13.854 mm, and the exit thickness of the strip head on the operating side is 13.916 mm.

[0114] (2) Assuming the current workpiece plasticity is 300 ton / mm, the roll gap gain coefficient for thickness difference calculation is 1.1, the workpiece plasticity correction coefficient is 0.6, and the roll gap deviation pre-control amount when the current stand head is threaded is 0.188 mm;

[0115] (3) After the current stand bites the steel, the deviation of the roll gap on both sides of the mill is automatically adjusted according to the actual rolling force change data;

[0116] (4) When the next stand bites the steel, assuming the current stand's roll linear speed is 2m / s, the rolling speed is 2.5m / s, and the time correction coefficient is 1.2, the recovery time for the strip head roll gap deviation adjustment is 0.96s.

[0117] (5) Based on the rack spacing of 5500mm, the strip tail length coefficient is corrected to 1.1, the entry thickness of the previous rack is 17mm, the entry thickness of the current rack is 14mm, and the sampling length of the tail of the previous rack is 4529mm.

[0118] (6) Assuming that the rolling force of the previous stand is 2870ton, the real-time roll gap is 13.5mm, the stiffness of the drive side under the current rolling force is 590ton, the stiffness of the operating side is 620ton, the zero-adjustment rolling force is 1500ton, and the thickness compensation values ​​on both sides of the strip tail are 0, the thickness of the current stand entrance drive side is calculated to be 15.822mm, and the thickness of the operating side is 15.709mm.

[0119] (6) Assuming that the length of the tail strip is divided into 200 parts, the calculated thickness of the 4529mm tail strip is divided into 200 calculated thicknesses on both sides and stored in the storage area before the previous stand throws the steel. After the previous stand throws the steel, the current stand starts to read the first calculated thickness on both sides stored by the previous stand.

[0120] (7) Based on the first transmission side exit thickness of 15.822mm and the operating side thickness of 15.709mm stored in the previous stand, the transmission side stiffness of 623ton and the operating side stiffness of 605ton under the current rolling force, the current plasticity coefficient of 332ton, the thickness difference calculation roll gap gain coefficient of 1.1, the workpiece plasticity correction coefficient of 0.6, the roll gap deviation pre-control amount when the current stand head is threaded is calculated to be 0.268mm;

[0121] (8) During the real-time rolling process at the tail end of the mill, the adjustment amount of the roll gap on both sides of the tail end of the mill is calculated and corrected in real time. After the current mill discards the steel, the roll gap deviation compensation value is restored to the pre-controlled deviation value of the head of the next strip.

[0122] In summary, this embodiment provides a method for calculating the head and tail roll gap deviation under unstressed conditions. The roll gap deviation is calculated based on factors such as inconsistent stiffness on both sides of the mill. The exit thickness of the strip is calculated under multiple factors including inconsistent stiffness on both sides of the mill, pressure deviation on both sides before the previous stand's strip ejection, and the plasticity of the rolled piece. The roll gap is then calculated back based on the exit thickness and adjusted in real time. The exit thickness is calculated based on the rolling force deviation of the previous stand, and the roll gap is calculated back based on stiffness, plasticity, and other data. Furthermore, the thickness difference "translation" concept is used to "migrate" the thickness deviation on both sides of the tail of the previous stand to the current stand for pre-control. By pre-controlling and real-time adjusting the roll gap deviation on both sides of the current mill during strip threading and tail ejection, problems such as head deviation during strip threading and tail-wagging during strip ejection are solved, which has a positive impact on improving the stability of strip threading and ejection.

[0123] Second Embodiment

[0124] This embodiment provides an electronic device, such as... Figure 3 As shown, the electronic device includes a processor and a memory; wherein the processor and the memory can be connected via a communication bus; the memory stores at least one instruction, which is loaded and executed by the processor to implement the method of the first embodiment described above. Furthermore, the electronic device may also include a transceiver, the processor and the transceiver being connected via a communication bus, the transceiver being used to communicate with other devices.

[0125] Below, in conjunction with Figure 3 A detailed description of each component of this electronic device is provided below:

[0126] The processor is the control center of the electronic device. The electronic device may include multiple processors, each of which can be a single-core processor (single-CPU) or a multi-core processor (multi-CPU). The term "processor" can refer to a single processor or a collective term for multiple processing elements. For example, a processor can be one or more central processing units (CPUs), other general-purpose processors, application-specific integrated circuits (ASICs), or one or more integrated circuits configured to implement embodiments of the present invention, such as one or more digital signal processors (DSPs), one or more field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor. The processor can perform various functions of the electronic device by running or executing software programs stored in memory and by calling data stored in memory.

[0127] In a specific implementation, as one example, the processor may include one or more CPUs, for example... Figure 3 CPU0 and CPU1 shown are, of course, merely illustrative examples.

[0128] The memory is used to store the software program that executes the solution of the present invention, and the processor controls its execution. For specific implementation methods, please refer to the above method embodiments, which will not be repeated here.

[0129] Optionally, the memory may be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, or electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but not limited thereto. The memory may be integrated with the processor or may exist independently, and may be accessed through the interface circuit of the electronic device (…). Figure 3 (Not shown in the image) is coupled to the processor; however, this embodiment of the invention does not impose specific limitations on this.

[0130] The transceiver may include a receiver and a transmitter. Figure 3 (Not shown separately). The receiver is used to implement the receiving function, and the transmitter is used to implement the transmitting function. The transceiver can be integrated with the processor or exist independently, and is connected through the interface circuit of the electronic device (…). Figure 3 (Not shown in the image) is coupled to the processor, and this embodiment of the invention does not specifically limit this.

[0131] In addition, it should be noted that, Figure 3 The structure of the electronic device shown is not intended to limit the device. Actual devices may include more or fewer components than shown, or combine certain components, or have different component arrangements. Furthermore, the technical effects achieved by this electronic device when performing the method of the first embodiment described above can be referenced to the technical effects described in the first embodiment; therefore, they will not be repeated here.

[0132] Third Embodiment

[0133] This embodiment provides a computer-readable storage medium storing at least one instruction, which is loaded and executed by a processor to implement the method of the first embodiment described above. The computer-readable storage medium may be a ROM, random access memory, CD-ROM, magnetic tape, floppy disk, or optical data storage device, etc. The instruction stored therein can be loaded and executed by a processor in a terminal.

[0134] Furthermore, it should be noted that the present invention can be provided as a method, apparatus, or computer program product. Therefore, embodiments of the present invention can take the form of a completely or partially hardware embodiment, a completely or partially software embodiment, or an embodiment combining software and hardware aspects. Moreover, when implemented in software, embodiments of the present invention can take the form of a computer program product implemented on one or more computer-usable storage media containing computer-usable program code. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer program are loaded or executed on a computer, all or part of the processes or functions described in the embodiments of the present invention are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any usable medium accessible to a computer or a data storage device such as a server or data center containing one or more sets of usable media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium. A semiconductor medium can be a solid-state drive (SSD).

[0135] Embodiments of the present invention are described with reference to flowchart illustrations and / or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations 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, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0136] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing terminal device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1The functions specified in one or more boxes. These computer program instructions may also be loaded onto a computer or other programmable data processing terminal equipment to cause a series of operational steps to be performed on the computer or other programmable terminal equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable terminal equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0137] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element. Furthermore, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone, where A and B can be singular or plural. Additionally, the character " / " in this text generally indicates an "or" relationship between the preceding and following objects, but it can also indicate an "AND / OR" relationship. Please refer to the context for specific interpretations. "At least one" refers to one or more items, while "more than" refers to two or more items. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, at least one of a, b, or c can be represented as: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0138] Furthermore, it is understood that in various embodiments of the present invention, the order of the above-mentioned process numbers does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0139] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0140] In the several embodiments provided by this invention, it should be understood that the disclosed devices, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of functional modules / units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. Furthermore, the shown or discussed mutual couplings or direct couplings or communication connections may be through some interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms. Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, i.e., they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs. Additionally, the functional units in the various embodiments of this invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0141] If the method is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0142] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention. It should be pointed out that although preferred embodiments of the present invention have been described, those skilled in the art, once they understand the basic inventive concept of the present invention, can make several improvements and modifications without departing from the principles described herein. These improvements and modifications should also be considered within the scope of protection of the present invention. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present invention.

Claims

1. A method for calculating the head and tail roll gap deviation under untensioned conditions, characterized in that, include: Calculate the pre-control value of the roller gap deviation before the belt is threaded onto the current frame head; Before the next stand bites the steel, the roll gap deviation on both sides of the current stand is adjusted in real time according to the actual rolling force change. After the next stand bites the steel, the adjustment amount of the roll gap deviation on both sides of the current stand is cancelled. After the previous stand throws steel, calculate the real-time adjustment amount of the roll gap deviation of the current stand after the tail of the previous stand throws steel. After the current strip is thrown, the roll gap deviation pre-control value is applied to the roll gap deviation pre-control value of the head of the next strip. Before the subsequent stand bites the steel, the roll gap deviation on both sides of the current stand is adjusted in real time according to the actual rolling force changes. After the subsequent stand bites the steel, the adjustment amount of the roll gap deviation on both sides of the current stand is cancelled, including: Before the next stand bites the steel, the real-time adjustment amount of the roll gap deviation on both sides of the current stand is calculated based on the real-time exit thickness on both sides of the strip head of the current stand, the real-time rolling force of the current stand mill, the real-time stiffness of both sides of the current stand as the rolling force changes, and the plasticity of the rolled piece of the current stand as the rolling force changes. Wait for the next frame to engage with the steel, and establish tension between the current frame and the next frame; Once the tension between the current stand and the next stand is established, the recovery time of the strip head roll gap deviation adjustment is calculated using the actual linear speed of the rolls in the current stand, the set rolling linear speed of the rolls, and the time correction coefficient. Based on the recovery time of the strip head roll gap deviation adjustment, the current stand cancels the adjustment of the roll gap deviation on both sides of the mill. The formula for calculating the real-time adjustment of the roll gap deviation on both sides of the current mill stand is: S dou = S ou - S du ； ； ； ； ； in, S dou This indicates the real-time adjustment amount of the roll gap deviation on both sides of the current mill stand. It is used to adjust the roll gap deviation on both sides of the current mill stand in real time before the next stand bites the steel. During adjustment, the drive-side roll gap setpoint is added to... S dou The operating side roller gap is given by minus S dou ; S ou This indicates the real-time adjustment amount of the roll gap on the operating side of the strip head of the current frame; S du This indicates the real-time adjustment amount of the roller gap on the drive side of the strip head of the current frame; h dru This indicates the real-time exit thickness of the strip head drive side of the current frame; h opu This indicates the real-time exit thickness of the strip head on the operating side of the current frame; M dru This indicates the real-time stiffness of the current frame drive side as the rolling force changes; M opu This indicates the real-time stiffness of the current stand operating side as the rolling force changes; K u This indicates the change in plasticity of the workpiece under rolling force at the current stand; G m This represents the gain coefficient for roll gap adjustment, and its value ranges from 0.2 to 1.

5. S f This represents the plasticity correction factor for the rolled piece, and its value ranges from 0.1 to 1. S This indicates the current real-time average roll gap of the machine frame; P 0 indicates that the current stand has zero-adjusted rolling force; O dr This indicates the current thickness compensation value for the strip head drive side exit of the machine frame, and its value ranges from 0 to 0.

5. O op This indicates the current strip head operating side exit thickness compensation value of the frame, which ranges from 0 to 0.

5. P u This indicates the real-time rolling force of the current stand mill; The formula for calculating the recovery time of the strip head roll gap deviation adjustment is as follows: t o = V u ÷V s ×K v ； in, t o This indicates the recovery time of the strip head roll gap deviation adjustment, which is the time to cancel the adjustment of the roll gap deviation on both sides of the mill after the next stand bites the strip. V u This indicates the actual linear velocity of the rolls on the current stand; V s This indicates the current rolling speed setting for the mill stand rolls; K v This represents the time correction factor, which ranges from 0.1 to 1.

5.

2. The method for calculating the head and tail roll gap deviation under tension loss as described in claim 1, characterized in that, The calculation of the pre-control value of the roll gap deviation before the current frame head is threaded includes: The thickness of the strip head at the current stand is calculated based on the predicted rolling force at the current stand's strip head, the mill stiffness on both sides corresponding to the predicted rolling force at the current stand's strip head, the real-time average roll gap at the current stand, the zero-adjustment rolling force at the current stand, and the thickness compensation value at the exit of the strip head at both sides of the current stand. Based on the calculated exit thickness of the strip head on both sides of the current stand, the mill stiffness on both sides corresponding to the predicted rolling force, and the plasticity of the strip head, the pre-control value of the roll gap deviation before strip threading at the current stand head is calculated.

3. The method for calculating the head and tail roll gap deviation under untensioned conditions as described in claim 2, characterized in that, The formula for calculating the thickness of the strip exit on both sides of the current frame head is: ； ； in, h dr This indicates the current thickness of the strip head at the drive side exit of the frame; h op This indicates the current thickness of the strip head at the operating side exit of the machine frame; S This indicates the current real-time average roll gap of the machine frame; P s This indicates the predicted rolling force at the head of the strip on the current stand; P 0 indicates that the current stand has zero-adjusted rolling force; M dr This indicates the mill drive-side stiffness corresponding to the predicted rolling force at the strip head of the current stand; M op This indicates the mill operating side stiffness corresponding to the predicted rolling force at the head of the strip on the current stand; O dr This indicates the current thickness compensation value for the strip head drive side exit of the machine frame, and its value ranges from 0 to 0.

5. O op This indicates the current thickness compensation value of the strip head operating side exit of the machine frame, and its value ranges from 0 to 0.

5.

4. The method for calculating the head and tail roll gap deviation under the state of tension loss as described in claim 2, characterized in that, The formula for calculating the pre-control value of the roll gap deviation before the belt is threaded at the head of the current frame is: S do = S o - S d ； ； ； in, S do This represents the pre-control value of the roll gap deviation before the tape is threaded at the head of the current frame. It is used to pre-adjust the roll gap deviation before the tape is threaded at the head of the current frame. During pre-adjustment, the given roll gap on the drive side is added to... S do The operating side roller gap is given by minus S do ; S o This indicates the pre-adjustment amount of the roll gap on the operating side of the strip head on the current stand; S d This indicates the pre-adjustment amount of the roll gap on the drive side of the strip head on the current frame; h dr This indicates the current thickness of the strip head at the drive side exit of the frame; h op This indicates the current thickness of the strip head at the operating side exit of the machine frame; M dr This indicates the mill drive-side stiffness corresponding to the predicted rolling force at the strip head of the current stand; M op This indicates the mill operating side stiffness corresponding to the predicted rolling force at the head of the strip on the current stand; K This indicates the plasticity of the head of the workpiece being rolled on the current stand; G m This represents the gain coefficient for roll gap adjustment, and its value ranges from 0.2 to 1.

5. S f This represents the plasticity correction factor for the rolled piece, and its value ranges from 0.1 to 1.

5. The method for calculating the head and tail roll gap deviation under the state of tension loss as described in claim 1, characterized in that, After the previous stand throws steel, calculate the real-time adjustment amount of the roll gap deviation of the current stand after the tail of the previous stand throws steel, including: The rolling force on both sides of the tail of the strip before the steel is thrown out of the stand before sampling; Based on the real-time average roll gap of the previous stand, the real-time rolling force of the previous stand, the mill stiffness corresponding to the real-time rolling force of the previous stand, and the real-time average roll gap of the current stand... 、 The current stand zero-adjustment rolling force and the current stand strip tail entry thickness compensation value are used to calculate the entry thickness on both sides of the current stand strip tail. Based on the entry thickness of the strip at both sides of the tail of the current stand, the stiffness of both sides corresponding to the real-time rolling force, and the plasticity of the tail of the rolled piece, calculate the real-time adjustment amount of the roll gap deviation of the current stand after the strip is thrown out at the tail of the previous stand.

6. The method for calculating the head and tail roll gap deviation under the state of tension loss as described in claim 5, characterized in that, The rolling force on both sides of the tail of the strip before the steel is thrown out of the stand before sampling includes: Based on the frame spacing and the correction strip tail length coefficient 、 The length of the strip tail before the previous rack's inlet thickness and the current rack's inlet thickness are used to calculate the length of the strip tail before the previous rack's strip throwing process, using the following formula: L t = h÷H×l x ×l k ； in, L t This indicates the length of the strip tail before it is thrown from the previous stand; h Indicates the current strip entry thickness of the frame; H Indicates the thickness of the strip at the entrance of the previous frame; l x Indicates the distance between the two racks; l k This represents the correction factor for the tail length of the strip, with a value ranging from 1 to 1.

3. Based on the calculation L t ,exist L t The rolling force on both sides of the tail of the strip before the steel is thrown out of the previous stand within the sampling range; The formula for calculating the thickness of the strip entering the inlet on both sides of the current frame is: ； ； in, h rdr This indicates the current thickness of the strip at the drive side inlet of the frame. h rop This indicates the current thickness of the strip at the operating side inlet of the frame. S -1 This indicates the real-time average roll gap of the previous frame; P u-1 This indicates the real-time rolling force of the previous stand mill; M dru-1 This indicates the real-time stiffness of the drive side of the previous stand as the rolling force changes. M opu-1 This indicates the real-time stiffness of the operating side of the previous stand as the rolling force changes. O drt This indicates the current thickness compensation value at the drive side inlet of the strip tail section of the frame, and its value ranges from 0 to 1. O opt This indicates the current thickness compensation value at the operating side entrance of the strip tail of the frame, and its value ranges from 0 to 1. P 0-1 This indicates the zero-adjustment rolling force of the previous stand.

7. The method for calculating the head and tail roll gap deviation under tension loss as described in claim 5, characterized in that, Based on the entry thickness of the strip at both ends of the current stand, the stiffness of both sides corresponding to the real-time rolling force, and the plasticity of the strip tail, calculate the real-time adjustment amount of the roll gap deviation of the current stand after the strip is thrown out at the tail of the previous stand, including: The current length of the tail strip of the frame l y Average score n The thickness of the strip at the exit on both sides of the sampled front frame was also divided into equal portions. n Parts, define storage range, and n The thickness of the strip steel exiting from both sides of the previous frame is stored sequentially along its length into the storage area; among which, l y = l x ×l k ;in, l x Indicates the distance between the two racks; l k This represents the correction factor for the tail length of the strip, with a value ranging from 1 to 1.

3. n The value range is 20 to 500; After the previous stand discards the strip, the current stand sequentially reads the exit thickness on both sides of the strip tail from the previous stand within the storage range. Combining this with the real-time rolling force corresponding to the stiffness on both sides and the plasticity of the strip tail, the current stand calculates the real-time adjustment amount of the roll gap deviation after the previous stand discards the strip. The formula is as follows: S dot = S ot - S dt ； ； ； in, S dot This indicates the real-time adjustment amount of the roll gap deviation for the current stand after the previous stand has thrown steel at the tail end. It is used to adjust the roll gap deviation on both sides of the current stand in real time after the previous stand has thrown steel. During adjustment, the drive-side roll gap setpoint is added to... S dot The operating side roller gap is given by minus S dot ; S ot This indicates the amount of time the roller gap on the current stand is adjusted after the steel is thrown off the previous stand. S du This indicates the amount of real-time adjustment of the roller gap on the drive side of the current frame after the previous frame has finished throwing steel. h rdr The thickness of the current frame strip at the drive side inlet; h rop This refers to the thickness of the current frame strip at the operating side inlet. M dru This represents the real-time stiffness of the current frame drive side as the rolling force changes; M opu The real-time stiffness of the current stand operating side as the rolling force changes; K u The plasticity of the workpiece being rolled on the current stand varies with the rolling force; G m This is the gain coefficient for roll gap adjustment, and its value ranges from 0.2 to 1.

5. S f This is the plasticity correction factor for the rolled piece, and its value ranges from 0.1 to 1.

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