A method for evaluating the process accuracy of roll shifting equipment based on hot rolling mills

Abstract

This invention provides a method for evaluating the process accuracy of roll shifting equipment in hot rolling mills, belonging to the field of roll shifting accuracy control in hot rolling mills. The method includes: determining the positional deviations of the upper and lower rolls; determining the positional stability of the upper and lower rolls; determining the inlet and outlet deviations of the upper and lower rolls; determining the bite impact fluctuations of the upper and lower rolls; and employing a three-level scoring system to score eight indicators: upper roll positional deviation, lower roll positional deviation, upper roll positional stability, lower roll positional stability, upper roll inlet and outlet deviation, lower roll inlet and outlet deviation, upper roll bite impact fluctuation, and lower roll bite impact fluctuation. Based on the scores of each indicator, a comprehensive score for the running accuracy of the roll shifting equipment is determined. Using this invention, the running accuracy and performance of the roll shifting equipment in the rolling mill can be judged in real time.

Description

Technical Field

[0001] This invention relates to the field of precision control of roll shifting in hot rolling mills, and in particular to a method for evaluating the process precision of roll shifting equipment based on hot rolling mills. Background Technology

[0002] In the hot-rolled strip steel production process, the horizontal movement of the rolls improves roll efficiency and extends roll life, which is an important part of ensuring product quality and process quantification. By establishing a roll movement accuracy evaluation model, the roll movement control parameters and operating curves are monitored in real time, and the roll movement status of each strip steel production is evaluated, allowing for timely detection and adjustment of problems. The roll movement position control is an automatic position control system, which automatically adjusts the position of the controlled object to the specified target value within a given time and within the allowable accuracy range.

[0003] Patent (CN110170534A, A control method for automatic intermediate roll shifting in a rolling mill, relating to the field of cold-rolled steel strip technology) proposes to control the position of the intermediate roll shifting by determining its shifting position under normal production conditions and meeting online shifting conditions, thereby increasing the utilization rate of the intermediate roll shifting and maximizing its role. Patent (CN212857134U, A protective cover for a hot rolling roll shifting device, belonging to the field of hot strip rolling technology) proposes a protective cover composed of a protective shell, a transparent cover, and locking components. Its overall structure is simple, its manufacturing cost is low, and it facilitates inspection personnel to observe the working condition of internal components, promptly detect and handle faults, and improve inspection efficiency. Patent (CN111644471A, An offline detection platform for intermediate roll shifting in a rolling mill) proposes to combine an intermediate roll coupling device with a fitted intermediate roll according to the actual working conditions of the rolling mill. By simulating the disassembly, assembly, and rolling operation of the intermediate roll, equipment faults can be predicted in advance, thereby improving the online operation accuracy and stability of the intermediate roll. The aforementioned literature introduces aspects such as the process design and control system of roll shifting, and proposes methods for controlling and predicting roll shifting. However, none of the above literature addresses the online quantitative evaluation of roll shifting control accuracy. Summary of the Invention

[0004] This invention provides a method for evaluating the process accuracy of roll shifting equipment in a hot rolling mill, capable of real-time assessment of the roll shifting accuracy and performance. The method includes:

[0005] Determine the positional deviations of the upper and lower rollers respectively;

[0006] Determine and maintain the positions of the upper and lower rollers respectively;

[0007] Determine the inlet and outlet deviations of the upper and lower rollers of the skewed roller respectively;

[0008] Determine the impact fluctuations of the upper and lower rolls biting the steel respectively;

[0009] A three-level scoring system was adopted to score eight indicators: upper roll position deviation, lower roll position deviation, upper roll position maintenance, lower roll position maintenance, upper roll inlet / outlet deviation, lower roll inlet / outlet deviation, upper roll bite impact fluctuation, and lower roll bite impact fluctuation. Based on the scores of each indicator, the comprehensive score of the mill's roll movement accuracy was determined.

[0010] Furthermore, before determining the positional deviations of the upper and lower rollers respectively, the method further includes:

[0011] Real-time acquisition of roller setting and actual measurement data;

[0012] The calculation of roller accuracy evaluation is automatically initiated based on the trigger event.

[0013] Furthermore, the collected roller setting data includes: the position setting curves of the upper and lower rollers of the roller shifting;

[0014] The collected measured data of the skewed rolls include: steel biting signal, position feedback curves of the upper and lower rolls of the skewed rolls, and inlet and outlet position feedback curves of the upper and lower rolls of the skewed rolls.

[0015] Furthermore, the triggering event includes: steel parts biting into each rack.

[0016] Further, determining the positional deviation of the upper roller includes:

[0017] Determine the start and end time zones of the upper roller position deviation index [t] s1 ,t e1 ]; where t s1 t represents the starting moment of the current coil of steel biting. e1 This is the current moment when the coiled steel is discarded;

[0018] In the start and end time zones [t] s1 ,t e1 Within [the specified area], calculate the position deviation Δy of the upper roller of the shifting roller:

[0019] △y=|y set -y act | max

[0020] Among them, y set A curve signal is given for the position of the upper roller of the shifting roller, y act This is the feedback curve signal for the position of the upper roller of the skewed roller.

[0021] Further, determining the position of the upper roller of the shifting roller includes:

[0022] Determine the start and end time zones of the position holding index for the upper roller of the shifting roller [t] s2 ,t e2 ]; where t s2t is the initial time before the steel bites. e2 For the moment of biting steel;

[0023] In the start and end time zones [t] s2 ,t e2 ]Calculate the median μ of the given curve signal for the position of the upper roller of the shifting roller. set and the median μ of the feedback curve signal act :

[0024]

[0025]

[0026] in, The given curve signal and feedback curve signal represent the position of the upper roller of the shifting roller, respectively. set m act They represent The index of the intermediate value in the sequence, n represents the start and end time zones [t] s2 ,t e2 The number of signal points acquired within the range;

[0027] Based on the median μ of the given curve signal of the obtained upper roller position of the skewed roller set and the median μ of the feedback curve signal act Determine the position of the upper roller of the shifting roller and maintain the calculated result Δμ:

[0028] △μ=|μ act -μ set |

[0029] Furthermore, determining the inlet and outlet deviations of the upper roller includes:

[0030] Determine the start and end time zones of the inlet and outlet deviation index of the skewed roll [t] s1 ,t e1 ]; where t s1 t represents the starting moment of the current coil of steel biting. e1 This is the current moment when the coiled steel is discarded;

[0031] In the start and end time zones [t] s1 ,t e1 Within this range, calculate the inlet and outlet deviation Δe of the upper roller:

[0032] △e=|μ en -μ ex |

[0033] Where, μ en The signal μ is the feedback curve of the upper roller inlet position of the skewed roller. ex This is the signal for the feedback curve of the exit position of the upper roller of the skewed roller.

[0034] Furthermore, the impact fluctuation of the upper roll biting the steel is determined to include:

[0035] Determine the start and end time zones of the impact fluctuation index of the upper roll biting steel [t] s1 ,t s1 +300]; where t s1 This is the start time of the current whole coil of steel biting, and the end time is 300ms after the start time of biting;

[0036] In the start and end time zones [t] s1 ,t s1 Within +300], find all the extreme points of the current upper roller biting steel impact fluctuation, and form the extreme point set Angle. mi (n); where n represents the number of extreme points, which include: maximum points and minimum points;

[0037] For the set of extreme points Angle mi (n) Perform the difference between the previous and next values ​​and take the absolute value to form the set of oscillation amplitudes A. mi (n-1); where A is the oscillation amplitude formed by the k-th extreme point and the (k+1)-th extreme point. mi (k) is represented as:

[0038] A mi (k)=|Angle mi (k+1)-Angle mi (k)|, k∈[1,n-1]

[0039] Take the maximum value in the set of oscillation amplitudes as the impact fluctuation A of the upper roll biting the steel. i :

[0040] A i =max[A mi (n-1)].

[0041] Furthermore, a three-level scoring system is adopted to score eight indicators: upper roll position deviation, lower roll position deviation, upper roll position maintenance, lower roll position maintenance, upper roll inlet / outlet deviation, lower roll inlet / outlet deviation, upper roll bite impact fluctuation, and lower roll bite impact fluctuation. Based on the scores of each indicator, the comprehensive score for the rolling mill roll movement accuracy is determined, including:

[0042] A three-level scoring system is adopted to score eight indicators: upper roll position deviation, lower roll position deviation, upper roll position retention, lower roll position retention, upper roll inlet / outlet deviation, lower roll inlet / outlet deviation, upper roll bite impact fluctuation, and lower roll bite impact fluctuation. The scores of each indicator are added together to obtain the comprehensive running accuracy score s of the mill roll shifting. WRS ;

[0043] In the three-level scoring system, the score allocation formula for each indicator is as follows:

[0044]

[0045] Among them, s k Thd represents the score of the k-th index of the roller misalignment. k1 ~Thd k3 This represents the thresholds at each level, and w1 to w3 represent the indexes. k Scores within different ranges;

[0046] Comprehensive score of rolling mill roll movement accuracy (s) WRS Represented as:

[0047] s WRS =∑s k

[0048] Real-time comprehensive score of the running accuracy of the rolling mill roll shifting WRS Compare with the normal range [thd4, thd′4] and make a judgment; when s WRS An alarm will be triggered promptly when the value exceeds the normal range, reminding on-site personnel to check and adjust the working status of the rollers; where thd4 and thd′4 are the minimum and maximum values ​​of the normal range for the comprehensive accuracy score, respectively.

[0049] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following:

[0050] In this embodiment of the invention, the evaluation target is decomposed into eight easily quantifiable and easily collected indicators. The values ​​for each indicator are established, and each indicator is scored under a three-level scoring system. Finally, a comprehensive score for the running accuracy of the mill roll shifting is obtained. This allows for real-time assessment of the running accuracy and performance of the mill roll shifting, providing assistance for timely troubleshooting of roll shifting control faults and improving the working condition of the rolls. Attached Figure Description

[0051] 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.

[0052] Figure 1 This is a flowchart illustrating the method for evaluating the process accuracy of a roll shifting device based on a hot rolling mill, as provided in an embodiment of the present invention. Detailed Implementation

[0053] 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.

[0054] like Figure 1 As shown, this embodiment of the invention provides a method for evaluating the process accuracy of roll shifting equipment based on a hot rolling mill, including:

[0055] S101, determine the positional deviations of the upper and lower rollers of the shifting roller respectively;

[0056] In this embodiment, before determining the positional deviations of the upper and lower rollers respectively, the method further includes:

[0057] A1, real-time acquisition of roller setting and actual measurement data;

[0058] In this embodiment, the collected roller setting data includes: the position setting curves of the upper and lower rollers of the roller shifting;

[0059] The collected measured data of the skewed rolls include: steel biting signal, position feedback curves of the upper and lower rolls of the skewed rolls, and inlet and outlet position feedback curves of the upper and lower rolls of the skewed rolls.

[0060] A2, automatically initiates the calculation of roller accuracy evaluation based on the trigger event.

[0061] In this embodiment, the triggering event includes: steel parts biting into each frame.

[0062] In this embodiment, the calculation process of the position deviation of the upper roller of the skewed roller is the same as that of the calculation process of the position deviation of the lower roller of the skewed roller, except that the parameters passed in to the two are different. In this embodiment, the position deviation of the upper roller of the skewed roller is taken as an example to describe in detail the solution process of the position deviation.

[0063] In this embodiment, determining the positional deviation of the upper roller of the misaligned roller may specifically include the following steps:

[0064] Determine the start and end time zones of the upper roller position deviation index [t] s1 ,t e1 ]; where t s1 t represents the starting moment of the current coil of steel biting. e1 This is the current moment when the coiled steel is discarded;

[0065] In the start and end time zones [t] s1 ,t e1 Within [the specified area], calculate the position deviation Δy of the upper roller of the shifting roller:

[0066] △y=|y set -y act | max

[0067] Among them, y set A curve signal is given for the position of the upper roller of the shifting roller, yact This is the feedback curve signal for the position of the upper roller of the skewed roller.

[0068] In this embodiment, the positional deviation of the lower roller is calculated similarly.

[0069] S102, determine the position maintenance of the upper and lower rollers of the shifting roller respectively;

[0070] In this embodiment, the calculation process for maintaining the position of the upper roller of the skewed roller is the same as that for maintaining the position of the lower roller of the skewed roller, except that the parameters passed to them are different. In this embodiment, the solution process for maintaining the position of the upper roller of the skewed roller is described in detail, taking the maintenance of the position of the upper roller of the skewed roller as an example.

[0071] In this embodiment, determining the position of the upper roller of the shifting roller may specifically include the following steps:

[0072] Determine the start and end time zones of the position holding index for the upper roller of the shifting roller [t] s2 ,t e2 ]; where t s2 t is the initial time before the steel bites. e2 For the moment of biting steel;

[0073] In the start and end time zones [t] s2 ,t e2 ]Calculate the median μ of the given curve signal for the position of the upper roller of the shifting roller. set and the median μ of the feedback curve signal act :

[0074]

[0075]

[0076] in, The given curve signal and feedback curve signal represent the position of the upper roller of the shifting roller, respectively. set m act They represent The index of the intermediate value in the sequence, n represents the start and end time zones [t] s2 ,t e2 The number of signal points acquired within the range;

[0077] Based on the median μ of the given curve signal of the obtained upper roller position of the skewed roller set and the median μ of the feedback curve signal act Determine the position of the upper roller of the shifting roller and maintain the calculated result Δμ:

[0078] △μ=|μ act -μ set |

[0079] In this embodiment, the position retention value of the lower roller is calculated similarly.

[0080] S103, determine the inlet and outlet deviations of the upper and lower rollers respectively;

[0081] In this embodiment, the calculation process of the inlet and outlet deviation of the upper roller of the skew roller is the same as that of the lower roller of the skew roller, except that the parameters passed in to the two are different. In this embodiment, the inlet and outlet deviation of the upper roller of the skew roller is taken as an example to describe in detail the solution process of the inlet and outlet deviation.

[0082] In this embodiment, determining the inlet and outlet deviation of the upper roller may specifically include the following steps:

[0083] Determine the start and end time zones of the inlet and outlet deviation index of the skewed roll [t] s1 ,t e1 ]; where t s1 t represents the starting moment of the current coil of steel biting. e1 This is the current moment when the coiled steel is discarded;

[0084] In the start and end time zones [t] s1 ,t e1 Within this range, calculate the inlet and outlet deviation Δe of the upper roller:

[0085] △e=|μ en -μ ex |

[0086] Where, μ en The signal μ is the feedback curve of the upper roller inlet position of the skewed roller. ex This is the signal for the feedback curve of the exit position of the upper roller of the skewed roller.

[0087] In this embodiment, the deviation of the lower roller entering and exiting the roller is calculated similarly.

[0088] S104, determine the steel biting impact fluctuation of the upper and lower rolls of the skew roll respectively;

[0089] In this embodiment, the calculation process of the upper roll biting steel impact fluctuation is the same as that of the lower roll biting steel impact fluctuation, except that the parameters passed in to the two are different. In this embodiment, the solution process of the biting steel impact fluctuation is described in detail, taking the upper roll biting steel impact fluctuation as an example.

[0090] In this embodiment, determining the impact fluctuation of the upper roll biting the steel can specifically include the following steps:

[0091] Determine the start and end time zones of the impact fluctuation index of the upper roll biting steel [t] s1 ,t s1 +300]; where t s1 This is the start time of the current whole coil of steel biting, and the end time is 300ms after the start time of biting;

[0092] In the start and end time zones [t] s1 ,ts1 Within +300], find all the extreme points of the current upper roller biting steel impact fluctuation, and form the extreme point set Angle. mi (n); where n represents the number of extreme points, which include: maximum points and minimum points;

[0093] For the set of extreme points Angle mi (n) Perform the difference between the previous and next values ​​and take the absolute value to form the set of oscillation amplitudes A. mi (n-1); where A is the oscillation amplitude formed by the k-th extreme point and the (k+1)-th extreme point. mi (k) is represented as:

[0094] A mi (k)=|Angle mi (k+1)-Angle mi (k)|, k∈[1,n-1]

[0095] Take the maximum value in the set of oscillation amplitudes as the impact fluctuation A of the upper roll biting the steel. i :

[0096] A i =max[A mi (n-1)].

[0097] In this embodiment, the impact fluctuation of the lower roller biting the steel is calculated similarly.

[0098] S105 employs a three-level scoring system to score eight indicators: upper roll position deviation, lower roll position deviation, upper roll position retention, lower roll position retention, upper roll inlet / outlet deviation, lower roll inlet / outlet deviation, upper roll bite impact fluctuation, and lower roll bite impact fluctuation. Based on the scores of each indicator, a comprehensive score for the rolling mill's roll movement accuracy is determined. This can specifically include the following steps:

[0099] A three-level scoring system is adopted to score eight indicators: upper roll position deviation, lower roll position deviation, upper roll position retention, lower roll position retention, upper roll inlet / outlet deviation, lower roll inlet / outlet deviation, upper roll bite impact fluctuation, and lower roll bite impact fluctuation. The scores of each indicator are added together to obtain the comprehensive running accuracy score s of the mill roll shifting. WRS ;

[0100] In the three-level scoring system, the score allocation formula for each indicator is as follows:

[0101]

[0102] Among them, s k Thd represents the score of the k-th index of the roller misalignment. k1 ~Thdk3 This represents the thresholds at each level, and w1 to w3 represent the indexes. k Scores within different ranges;

[0103] Comprehensive score of rolling mill roll movement accuracy (s) WRS Represented as:

[0104] s WRS =∑s k

[0105] Real-time comprehensive score of the running accuracy of the rolling mill roll shifting WRS Compare with the normal range [thd4, thd′4] and make a judgment; when s WRS An alarm will be triggered promptly when the value exceeds the normal range, reminding on-site personnel to check and adjust the working status of the rollers; where thd4 and thd′4 are the minimum and maximum values ​​of the normal range for the comprehensive accuracy score, respectively.

[0106] To better understand this invention, a specific example is provided. The method for evaluating the process accuracy of roll shifting equipment based on a hot rolling mill, as provided in this embodiment, is applied to a 1780 hot continuous rolling production line. The roll shifting accuracy evaluation rules for this production line are shown in Table 1 (the roll shifting accuracy evaluation rules for different production lines are determined according to the actual situation). The calculated values ​​need to be processed into absolute values ​​before scoring.

[0107] Table 1. Evaluation Rules for Roll Shifting Accuracy of a Certain 1780 Hot Rolling Production Line

[0108]

[0109] The evaluation of the misaligned rolls in the finishing mill is conducted according to the evaluation rules in Table 1. The calculated results and corresponding weights of each misaligned roll indicator can be quickly found in Table 1. This invention evaluates the misaligned roll accuracy of seven stands during a rolling process on this production line, and the results are shown in Table 2. In this case, no deductions were made for the positional deviations of the upper and lower rolls, or for the impact fluctuations caused by the upper roll biting steel. However, deductions were made for other indicators, and some even had values ​​of zero. Based on the scores, on-site personnel can locate and inspect the equipment status.

[0110] Table 2. Evaluation Results of Roll Movement Accuracy of a Certain 1780 Hot Rolling Production Line

[0111]

[0112] The method for evaluating the process accuracy of roll shifting equipment based on a hot rolling mill, as described in this invention, decomposes the evaluation target into eight easily quantifiable and data-collectible indicators. Values ​​for each indicator are established, and each indicator is scored under a three-level scoring system. Finally, a comprehensive score for the running accuracy of the roll shifting is obtained. This allows for real-time assessment of the running accuracy and performance of the roll shifting, providing assistance for timely troubleshooting of roll shifting control faults and improving the working condition of the roll shifting equipment on the production floor.

[0113] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for evaluating the process accuracy of roll shifting equipment based on a hot rolling mill, characterized in that, include: Determine the positional deviations of the upper and lower rollers respectively; Determine and maintain the positions of the upper and lower rollers respectively; Determine the inlet and outlet deviations of the upper and lower rollers of the skewed roller respectively; Determine the impact fluctuations of the upper and lower rolls biting the steel respectively; A three-level scoring system is adopted to score the eight indicators of the determined roll shifting: upper roll position deviation, lower roll position deviation, upper roll position maintenance, lower roll position maintenance, upper roll inlet / outlet deviation, lower roll inlet / outlet deviation, upper roll bite impact fluctuation, and lower roll bite impact fluctuation. Based on the scores of each indicator, the comprehensive score of the rolling mill roll shifting accuracy is determined. Before determining the positional deviations of the upper and lower rollers respectively, the method further includes: Real-time acquisition of roller setting and actual measurement data; The calculation of roller accuracy evaluation is automatically initiated based on the trigger event. The collected data on the roller shifting settings includes: the position setting curves of the upper and lower rollers of the roller shifting; The collected measured data of the skewed rolls include: bite signal, position feedback curves of the upper and lower rolls of the skewed rolls, and inlet and outlet position feedback curves of the upper and lower rolls of the skewed rolls; The triggering events include: steel parts being bitten by each rack; Among them, determining the impact fluctuation of the upper roll biting the steel includes: Determine the start and end time zones of the impact fluctuation index of the upper roll biting steel [t] s1 ,t s1 +300]; where t s1 This is the start time of the current whole coil of steel biting, and the end time is 300ms after the start time of biting; In the start and end time zones [t] s1 ,t s1 Within +300], find all the extreme points of the current upper roller biting steel impact fluctuation, and form the extreme point set Angle. mi (n); where n represents the number of extreme points, which include: maximum points and minimum points; For the set of extreme points Angle mi (n) Perform the difference between the previous and next values ​​and take the absolute value to form the set of oscillation amplitudes A. mi (n-1); where A is the oscillation amplitude formed by the k-th extreme point and the (k+1)-th extreme point. mi (k) is represented as: And mi (k)=|Angle mi (k+1)-Angle mi (k)|,k∈[1,n-1] Take the maximum value in the set of oscillation amplitudes as the impact fluctuation A of the upper roll biting the steel. i : A i =max[A mi (n-1)]。 2. The method for evaluating the process accuracy of roll shifting equipment based on a hot rolling mill according to claim 1, characterized in that, Determining the positional deviation of the upper roller includes: Determine the start and end time zones of the upper roller position deviation index [t] s1 ,t e1 ]; where t s1 t represents the starting moment of the current coil of steel biting. e1 This is the current moment when the coiled steel is discarded; In the start and end time zones [t] s1 ,t e1 Within [the specified area], calculate the position deviation Δy of the upper roller of the shifting roller: △y=|y set -and act | max Among them, y set A curve signal is given for the position of the upper roller of the shifting roller, y act This is the feedback curve signal for the position of the upper roller of the skewed roller.

3. The method for evaluating the process accuracy of roll shifting equipment based on a hot rolling mill according to claim 1, characterized in that, Determining the position of the upper roller of the shifting roller includes: Determine the start and end time zones of the position holding index for the upper roller of the shifting roller [t] s2 ,t e2 ]; where t s2 t is the initial time before the steel bites. e2 For the moment of biting steel; In the start and end time zones [t] s2 ,t e2 ]Calculate the median μ of the given curve signal for the position of the upper roller of the shifting roller. set and the median μ of the feedback curve signal act : in, The given curve signal and feedback curve signal represent the position of the upper roller of the shifting roller, respectively. set m act They represent The index of the intermediate value in the sequence, n represents the start and end time zones [t] s2 ,t e2 The number of signal points acquired within the range; Based on the median μ of the given curve signal of the obtained upper roller position of the skewed roller set and the median μ of the feedback curve signal act Determine the position of the upper roller of the shifting roller and maintain the calculated result Δμ: △μ=|μ act -m set |。 4. The method for evaluating the process accuracy of roll shifting equipment based on a hot rolling mill according to claim 1, characterized in that, Determining the inlet and outlet deviations of the upper roller includes: Determine the start and end time zones of the inlet and outlet deviation index of the skewed roll [t] s1 ,t e1 ]; where t s1 t represents the starting moment of the current coil of steel biting. e1 This is the current moment when the coiled steel is discarded; In the start and end time zones [t] s1 ,t e1 Within this range, calculate the inlet and outlet deviation Δe of the upper roller: △e=|μ en -m ex | Where, μ en The signal μ is the feedback curve of the upper roller inlet position of the skewed roller. ex This is the signal for the feedback curve of the exit position of the upper roller of the skewed roller.

5. The method for evaluating the process accuracy of roll shifting equipment based on a hot rolling mill according to claim 1, characterized in that, The three-level scoring system is adopted to score eight indicators: upper roll position deviation, lower roll position deviation, upper roll position maintenance, lower roll position maintenance, upper roll inlet / outlet deviation, lower roll inlet / outlet deviation, upper roll bite impact fluctuation, and lower roll bite impact fluctuation. Based on the scores of each indicator, the comprehensive score of the mill's roll movement accuracy is determined, including: A three-level scoring system is adopted to score eight indicators: upper roll position deviation, lower roll position deviation, upper roll position retention, lower roll position retention, upper roll inlet / outlet deviation, lower roll inlet / outlet deviation, upper roll bite impact fluctuation, and lower roll bite impact fluctuation. The scores of each indicator are added together to obtain the comprehensive running accuracy score s of the mill roll shifting. WRS ; In the three-level scoring system, the score allocation formula for each indicator is as follows: Among them, s k Thd represents the score of the k-th index of the roller misalignment. k1 ,Thd k2 ,Thd k3 w1, w2, and w3 represent the thresholds at each level, and w1, w2, and w3 represent the indexes. k Scores within different ranges; Comprehensive score of rolling mill roll movement accuracy s WRS Represented as: s WRS =∑s k Real-time comprehensive score of the running accuracy of the rolling mill roll shifting WRS Compare with the normal range [thd4, thd4′] and make a judgment; when s WRS An alarm will be triggered promptly when the value exceeds the normal range, reminding on-site personnel to check and adjust the working status of the roller; where thd4 and thd4′ are the minimum and maximum values ​​of the normal range for the comprehensive accuracy score, respectively.

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