Online automatic target width modification method based on actual measurement width of slab

Abstract

The invention discloses an online automatic target width modification method based on the actual measurement width of a slab. The method comprises the following steps: establishing an evaluation rule for automatically and dynamically identifying and judging the credibility of the actual measurement width of the slab online; and then an online automatic finished plate blank width modification rule based on the automatic online dynamic identification and determination plate blank actual measurement width credibility evaluation rule is established. According to the invention, the stability of width control is improved, and the stability of strip steel edge quality is also improved.

Description

Technical Field

[0001] The present invention relates to a hot rolling production process control technology, and more particularly to an online automatic target width modification method based on the actual measured width of a slab. Background Art

[0002] Hot rolling mills in steel enterprises generally use four-level computer control L4~L1. Their main functions are as follows in order from top to bottom:

[0003] The production management system (L4) is mainly responsible for completing contract management, financial management, production plan preparation, mutual coordination of various production lines, application materials according to the contract, sending the work plan to the L3 level, collecting the actual production of the L3 level, tracking the production status and quality status, and organizing the delivery of finished products.

[0004] Production control system (L3), adjustment and issuance of major production plans (issued to L2), collection, processing and uploading of production performance to the production management level, management of three warehouses (slab warehouse, steel coil warehouse, finished product warehouse), and product quality monitoring, etc.

[0005] The process control system (L2) mainly performs the rolling procedure formulation and optimization functions based on mathematical models, and completes the setting and calculation tasks of process parameters (receives the production plan data issued by L3 and sends the set calculation values ​​to L1).

[0006] The basic automation system (L1) mainly completes the sequence control, position control, speed control, etc. of the equipment, and receives and executes the set values ​​from L2 (process control system).

[0007] At present, the width control of hot-rolled strip is mainly achieved by the process machine (L2) setting and calculating the rolling force and roll gap data of the rough rolling fixed width side press and vertical rollers according to the slab size information and target strip size information issued by L3, and the electrical control system (L1) drives the mechanical equipment to execute the relevant data.

[0008] The L2 system divides the steel into several levels according to information such as steel type and specification, and automatically sets and issues the distribution of the side pressure load corresponding to a certain steel type and specification between the fixed-width side press and the vertical roller in the form of a procedure table, and further calculates the rolling force and roll gap based on information such as temperature deformation and roll diameter.

[0009] However, the existing operation mode still has the following problems:

[0010] 1) The slab width provided by the steelmaking process has a tolerance range of ±20mm. However, due to fluctuations in the steelmaking process, the actual slab width deviates significantly from the information width. The actual width deviation of some slabs even exceeds ±50mm.

[0011] 2) Slab width is an important input condition for hot rolling width control. Unstable input brings unstable variation to hot rolling process control, affecting the stable control of hot rolling width.

[0012] 3) The actual width of the slab is unstable, which brings about fluctuations in the reduction of the roughing rolls. The reduction of the roughing rolls has an important influence on the edge quality. Therefore, the fluctuation of the actual width of the slab will also affect the edge quality of the hot-rolled strip. Summary of the Invention

[0013] In view of the defects existing in the prior art, the purpose of the present invention is to provide an online automatic modification method of the target width based on the actual measured width of the slab, so as to improve the stability of the width control and the stability of the edge quality of the strip.

[0014] To achieve the above object, the present invention adopts the following technical solutions:

[0015] A method for automatically modifying the target width online based on the measured width of the slab:

[0016] Establishing the reliability evaluation rules for automatic online dynamic identification and determination of slab width;

[0017] Then, an online automatic modification rule for the width of the finished slab is established based on the automatic online dynamic identification and determination of the credibility evaluation rule of the measured slab width.

[0018] Preferably, establishing the automatic online dynamic identification and determination of the credibility evaluation rule of the slab actual width specifically includes the following steps:

[0019] S1, after the slabs are put into storage, the production control system sends the information of the slabs to be produced to the process control system;

[0020] S2, the process control system receives and stores the slab information;

[0021] S3, the width gauge measures the actual width of the slab and sends the measured periodic data to the process control system;

[0022] S4, the process control system receives the periodic data, performs analysis and judgment, determines whether the actual width of the slab is available, sets a flag actDataFlag and assigns a value to it.

[0023] Preferably, the step S4 specifically includes the following steps:

[0024] S41, the process control system analyzes the shape of the slab and determines whether the shape of the slab is consistent with the slab information based on the measured width data of the slab;

[0025] S42, if the shape of the slab is inconsistent with the slab information, it is determined that the measured slab width is unreliable, and the flag actDataFlag = 1;

[0026] If the shape of the slab is consistent with the slab information, the deviation value between the width SWpdi of the slab information and the actual measured width SWact of the slab is calculated;

[0027] S43, if the deviation value is within the set range, it is determined that the measured slab width is credible, and the flag actDataFlag = 2; if the deviation value exceeds the set range, the flag actDataFlag = -2;

[0028] If the actual width data of the slab exceeds the allowable slab width range, the flag actDataFlag=-2;

[0029] If the process control machine does not obtain the actual width data of the slab, the flag actDataFlag=-1;

[0030] S43, when the measured slab width is credible and the flag actDataFlag=2, the online automatic modification rule of the finished slab width is established.

[0031] Preferably, the slab information includes steel type, slab number, strip steel number, slab width, slab thickness, finished product width, finished product thickness and slab shape.

[0032] Preferably, the shape analysis of the slab in step S41 specifically includes:

[0033] The process control system divides the collected measured width data of the slab into three sections: head, middle and tail, and calculates the average value for each section. If the difference between the average values ​​of the measured widths of the head and tail sections exceeds 30 mm, it is judged that the slab is actually T-shaped. If it does not exceed 30 mm, it is judged that the slab is actually rectangular.

[0034] Preferably, establishing the online automatic modification rule for the finished slab width includes the following steps:

[0035] 1) Set the automatic online width change function flag;

[0036] 2) Only modify the logic rules of slab width;

[0037] 3) Automatically modify the logic rules of finished slab width and slab width;

[0038] 4) The modified and updated data is synchronously written into the database;

[0039] 5) During production, the process control system performs setting calculations based on the slab width at the final exit from the furnace and the finished slab width information, and the basic automation system accepts and executes the relevant setting values ​​to complete the rolling process.

[0040] Preferably, the step 1) specifically includes:

[0041] The process control system sets the automatic width change function flag FLAG_chgw according to the steel grade classification characteristics, and identifies different automatic width change modes through the flag FLAG_chgw;

[0042] When FLAG_chgw=0, automatic width change is not performed;

[0043] When FLAG_chgw=1, the slab width is automatically modified and the target width of the finished slab remains unchanged;

[0044] When FLAG_chgw=2, the target width of the finished slab and the slab width are automatically modified.

[0045] Preferably, the step 2) specifically includes:

[0046] The process control system determines that the actual measured width of the slab is reliable under the premise that actDataFlag=2 and the automatic width change mode flag FLAG_chgw=1:

[0047] A) For the rectangular slab

[0048] Calculate the deviation value δSW=SWact-Swpdi between the width SWpdi of the slab information and the actual width SWact of the slab;

[0049] If -30 mm ≤ δ SW ≤ 30 mm, the process control system replaces the original slab width SW pdi of the strip in the rolling plan with the measured slab width SW act , and the new actual slab width SW act is used for setting calculations during production process control;

[0050] If δSW>30mm or δSW<-30mm, an information alarm will be outputted, indicating that the slab width deviation is large. The production staff will confirm and the automatic modification process of the slab width will be exited. The slab width information will still be the original value of the slab information.

[0051] B) For the T-shaped slab

[0052] Compare the measured head width SWact_h of the slab with the head slab width SWpdi_h of the slab information, and the measured tail width SWact_t of the slab with the tail slab width SWpdi_t of the slab information, and calculate the deviation values ​​δSW_h=SWact_h-SWpdi_h and δSW_t=SWact_t-SWpdi_t;

[0053] If -30 mm ≤ δW_h ≤ 30 mm, the process control system replaces the original slab width SWpdi_h of the strip in the rolling plan with the measured slab width SWact_h, and the new actual slab width SWact_h is used for setting calculations during production process control;

[0054] If -30 mm ≤ δW_t ≤ 30 mm, the process control system replaces the original slab width SWpdi_t of the strip in the rolling plan with the measured slab width SWpdi_t, and the new actual slab width SWpdi_t is used for setting calculations during production process control;

[0055] If δSW_h or δSW_t is greater than 30mm, or δSW_h or δSW_t is less than -30mm, an information alarm will be outputted "large slab width deviation" to prompt the production staff to confirm, and the automatic modification process of the slab width will be exited. The slab width information will still be the value of the original slab information.

[0056] Preferably, the step 3) specifically includes:

[0057] The process control system determines that the actual measured width of the slab is reliable under the premise that actDataFlag=2 and the automatic width change mode flag FLAG_chgw=2:

[0058] A) For the rectangular slab

[0059] Calculate the deviation value δSW=SWact-Swpdi between the width SWpdi of the slab information and the actual width SWact of the slab;

[0060] If -30 mm ≤ δ SW ≤ 30 mm, the process control system replaces the original slab width SW pdi of the strip in the rolling plan with the measured slab width SW act , and simultaneously corrects the target width CW pdi of the finished slab issued by the slab information in the rolling plan. The corrected CW_new = CW pdi + δ SW . The new actual slab width SW act and the new target width CW_new of the finished slab are used for setting and calculation during production process control.

[0061] If δSW>30mm or δSW<-30mm, an alarm message "large slab width deviation" will be output to prompt the production staff to confirm and exit the automatic modification process. The slab width information and the target width of the finished product will remain the original slab information values.

[0062] B) For the T-shaped slab

[0063] Compare the measured head width SWact_h of the slab with the head slab width SWpdi_h of the slab information, and the measured tail width SWact_t of the slab with the tail slab width SWpdi_t of the slab information, and calculate the deviation values ​​δSW_h=SWact_h-SWpdi_h and δSW_t=SWact_t-SWpdi_t;

[0064] If -30mm≤δSW_h≤30mm, and -30mm≤δSW_t≤30mm, then the process control system replaces the original slab width SWpdi_h / SWpdi_t of the strip in the rolling plan with the corresponding measured slab width SWact_h / SWpdi_t, and the target width CWpdi of the finished slab is corrected by taking the minimum value of the deviation between the measured width at the head and tail of the slab and the information width, that is, CW_new=CWpdi+min(δSW_h,δSW_t); the new actual slab width SWact_h / SWpdi_t and the new target width CW_new of the finished slab are used for setting and calculation during production process control;

[0065] If -30 mm ≤ δW_t ≤ 30 mm, the process control system replaces the original slab width SWpdi_t of the strip in the rolling plan with the measured slab width SWpdi_t, and the new actual slab width SWpdi_t is used for setting calculations during production process control;

[0066] If δSW_h or δSW_t is greater than 30mm, or δSW_h or δSW_t is less than -30mm, an information alarm will be outputted "large slab width deviation" to prompt the production staff to confirm, and the automatic modification process of the slab width will be exited. The slab width information will still be the value of the original slab information.

[0067] The present invention provides an online automatic target width modification method based on the measured slab width, which is applied to improve the uniformity control of hot-rolled strip width, reduce the incidence of product quality defects, improve the stability of width control, and improve the stability of strip edge quality. It also has the following beneficial effects:

[0068] 1) The present invention establishes a method for analyzing the slab width actually measured by the width gauge to determine whether the data is reliable;

[0069] 2) The present invention can flexibly set whether online automatic width change is required and the width change mode according to the production process control characteristics and the steel type;

[0070] 3) The present invention can effectively improve the hot rolling width control fluctuation caused by the deviation between the actual slab width and the slab width information;

[0071] 4) The present invention can improve the fluctuation of the vertical roller rolling force caused by the deviation between the actual width of the slab and the information width, and improve the edge quality of the strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] Figure 1 It is a flow chart of an embodiment of the method for online automatic modification of target width of the present invention. DETAILED DESCRIPTION

[0073] In order to better understand the above technical solutions of the present invention, the technical solutions of the present invention are further described below with reference to the accompanying drawings and embodiments.

[0074] The present invention provides an online automatic modification method for target width based on the actual measured width of the slab:

[0075] Firstly, the reliability evaluation rules of the automatic online dynamic recognition and determination of the slab measured width are established;

[0076] Then, an online automatic modification rule for the width of the finished slab is established based on the automatic online dynamic recognition and judgment of the credibility evaluation rule of the actual measured slab width.

[0077] The establishment of automatic online dynamic recognition and determination of the credibility evaluation rules of the slab measured width specifically includes the following steps:

[0078] S1, the slabs cast by steelmaking continuous casting are sent to the hot rolling slab warehouse. After the slabs are put into the warehouse, the production control system (L3) sends the information of the slabs to be produced to the process control system (L2) in the form of rolling plan;

[0079] S2, the process control system receives and stores slab information (i.e., production planning information, abbreviated as PDI), including basic information such as steel grade, slab number, strip steel number, slab width, slab thickness, finished product width, finished product thickness, and slab shape;

[0080] S3, the slab passes the furnace, the width gauge measures the actual width of the slab, and sends the measured cycle data to the process control system, which determines the slab number and PDI related information based on the tracking information;

[0081] S4, after receiving the cycle data, the process control system analyzes and determines whether the actual width of the slab is available, sets the flag actDataFlag and assigns a value to it.

[0082] In the above step S4, the process control system performs analysis and judgment, specifically including the following steps:

[0083] S41: The process control system analyzes the shape of the slab and determines whether the shape of the slab is consistent with the slab information (T-shaped slab or rectangular slab) based on the measured width data of the slab. The collected measured width data of the slab is divided into three sections: the head, middle, and tail, and the average value is calculated for each. If the difference between the measured width averages of the head and tail sections exceeds 30mm, the slab is determined to be T-shaped. If the difference does not exceed 30mm, the slab is determined to be rectangular.

[0084] S42, if the shape of the slab is inconsistent with the slab information, the information is T-shaped, but the measured data is not T-shaped, or the information is rectangular, but the measured full length and width data indicate T-shape, then it is determined that the measured slab width is unreliable, and the flag actDataFlag = 1;

[0085] If the shape of the slab is consistent with the slab information, the deviation value between the width SWpdi of the slab information and the actual measured width SWact of the slab is calculated;

[0086] S43, if the deviation value is within the set range (the empirical value is generally ±50mm), it is determined that the measured slab width is reliable, and the flag actDataFlag = 2; if the deviation value exceeds the set range, the flag actDataFlag = -2;

[0087] If the actual measured width data of the slab exceeds the allowable slab width range, the flag actDataFlag = -2;

[0088] If the process control machine does not obtain the actual width data of the slab, the flag actDataFlag = -1;

[0089] S43, when the measured slab width is credible and the flag actDataFlag=2, an online automatic modification rule for the finished slab width is established.

[0090] Establishing an online automatic modification rule for finished slab width based on automatic online dynamic recognition and determination of the credibility evaluation rule of the slab actual width includes the following steps:

[0091] 1) Set the automatic online width change function flag;

[0092] According to the production process control requirements of the product, the automatic width change function flag FLAG_chgw is set in the process control system according to the steel grade classification characteristics, and different automatic width change modes are identified by the flag FLAG_chgw.

[0093] When FLAG_chgw=0, automatic width change is not performed;

[0094] When FLAG_chgw=1, the slab width is automatically modified and the target width of the finished slab remains unchanged;

[0095] When FLAG_chgw=2, the target width of the finished slab and the slab width are automatically modified;

[0096] The process control system sets the automatic width change function flag table to specify whether to start the automatic width change function or the automatic width change mode:

[0097] SFC(steel grade) FLAG_chgw 0 0 A 0 B 1 C 2

[0098] 2) Only modify the logic rules of slab width;

[0099] Under the premise that the process control system determines that the actual measured width of the slab is reliable and actDataFlag=2, and the automatic width change mode flag FLAG_chgw=1:

[0100] A) For rectangular slabs

[0101] Calculate the deviation value δSW between the width SWpdi of the slab information and the actual width SWact of the slab = SWact-Swpdi;

[0102] If -30mm≤δSW≤30mm, the original slab width SWpdi of the strip in the rolling plan is replaced by the measured slab width SWact in the process control system, and the new actual slab width SWact is used for setting calculations during production process control;

[0103] If δSW>30mm or δSW<-30mm, an alarm message "large slab width deviation" will be output, and the production staff will confirm and exit the automatic slab width modification process. The slab width information will still be the original slab information value.

[0104] B) For T-shaped slabs (i.e., the widths of the slab at the head and tail are not equal according to PDI information)

[0105] Compare the measured head width SWact_h of the slab with the head slab width SWpdi_h of the slab information, and the measured tail width SWact_t of the slab with the tail slab width SWpdi_t of the slab information, and calculate the deviation values ​​δSW_h=SWact_h-SWpdi_h and δSW_t=SWact_t-SWpdi_t;

[0106] If -30mm≤δW_h≤30mm, the original slab width SWpdi_h of the strip in the rolling plan is replaced by the measured slab width SWact_h in the process control system, and the new actual slab width SWact_h is used for setting calculations during production process control;

[0107] If -30mm≤δW_t≤30mm, the original slab width SWpdi_t of the strip in the rolling plan is replaced with the measured slab width SWpdi_t in the process control system, and the new actual slab width SWpdi_t is used for setting calculations during production process control;

[0108] If δSW_h or δSW_t is greater than 30mm, or δSW_h or δSW_t is less than -30mm, an alarm message "large slab width deviation" will be output to prompt the production staff to confirm and the automatic slab width modification process will be exited. The slab width information will still be the original slab information value.

[0109] 3) Automatically modify the logic rules of finished slab width and slab width;

[0110] Under the premise that the process control system determines that the actual measured width of the slab is reliable and actDataFlag=2, and the automatic width change mode flag FLAG_chgw=2:

[0111] A) For rectangular slabs

[0112] Calculate the deviation value δSW between the width SWpdi of the slab information and the actual width SWact of the slab = SWact-Swpdi;

[0113] If -30mm≤δSW≤30mm, the original slab width SWpdi of the strip in the rolling plan is replaced with the measured slab width SWact in the process control system, and the target slab width CWpdi of the finished product issued by the slab information in the rolling plan is simultaneously corrected. The corrected CW_new = CWpdi + δSW. The new actual slab width SWact and the new target slab width CW_new are used for setting calculations during production process control.

[0114] If δSW>30mm or δSW<-30mm, an alarm message "large slab width deviation" will be output to prompt the production staff to confirm and exit the automatic modification process. The slab width information and the target width of the finished product will still be the values ​​of the original slab information.

[0115] B) For T-shaped slabs

[0116] Compare the measured head width SWact_h of the slab with the head slab width SWpdi_h of the slab information, and the measured tail width SWact_t of the slab with the tail slab width SWpdi_t of the slab information, and calculate the deviation values ​​δSW_h=SWact_h-SWpdi_h and δSW_t=SWact_t-SWpdi_t;

[0117] If -30mm≤δSW_h≤30mm, and -30mm≤δSW_t≤30mm (i.e., the deviation of the width of the slab at the head and tail is within ±30mm), then in the process control system, the original slab width SWpdi_h / SWpdi_t of the strip in the rolling plan is replaced with the corresponding measured slab width SWact_h / SWpdi_t, and the target width CWpdi of the finished slab is corrected by taking the minimum value of the deviation between the measured width at the head and tail of the slab and the information width, i.e., CW_new=CWpdi+min(δSW_h,δSW_t); the new actual slab width SWact_h / SWpdi_t and the new target width CW_new of the finished slab are used for setting calculations during production process control;

[0118] If -30mm≤δW_t≤30mm, the original slab width SWpdi_t of the strip in the rolling plan is replaced with the measured slab width SWpdi_t in the process control system, and the new actual slab width SWpdi_t is used for setting calculations during production process control;

[0119] If δSW_h or δSW_t is greater than 30mm, or δSW_h or δSW_t is less than -30mm, an alarm message "large slab width deviation" will be output to prompt the production staff to confirm and the automatic slab width modification process will be exited. The slab width information will still be the original slab information value.

[0120] 4) Information modification time point: After the process control system obtains the actual value of the slab width measurement, it enters the judgment process. If modification is required, the relevant information is modified immediately, and the updated data is synchronously written to the database;

[0121] 5) During production, the process control system sets and calculates the slab width at the final furnace exit and the finished slab width information. The basic automation system accepts and executes the relevant set values ​​to complete the rolling process.

[0122] Example

[0123] Combine Figure 1 As shown, the control flow of the method for online automatic modification of target width based on the actual measured width of the slab in this embodiment is as follows:

[0124] 1) Start

[0125] 2) Set the automatic online width change function mode code FLAG_chgw in the process control system (L2) and specify whether to use the automatic width information modification function and the modification method according to the characteristics of the product production process.

[0126] 3) The production control system (L3) sends the rolling plan information (including steel grade, slab width, target finished product width, etc.) to L2. L2 receives and stores the relevant information. It then reads the "Automatic Online Width Change Function Identification Table" and automatically checks the "Automatic Online Width Change Mode" FLAG_chgw for each steel piece in the received rolling plan based on the steel grade classification information. If FLAG_chgw = 0, the process of checking the measured slab width and automatically changing the width is terminated. If FLAG_chgw ≠ 0, the process of checking the measured slab width and automatically changing the width is resumed.

[0127] 4) The slab to be produced enters the loading and furnace stage, and the slab passes through the furnace width gauge to measure the actual width of the slab. The instrument sends the measurement data to L2.

[0128] 5) L2 finds the strip steel number corresponding to the measured slab width based on the tracking information, and obtains the original slab width and finished product target width issued by L3.

[0129] 6) L2 analyzes the measured slab width information and compares it with the original slab width information for the corresponding strip grade in the rolling plan. It determines whether the measured slab width is reliable and assigns a value to the flag actDataFlag (2 for reliable, 1 for shape inconsistency, -1 for no measured data, and -2 for excessive data deviation). If the measured slab width is reliable, i.e., actDataFlag = 2, the automatic width adjustment process begins; otherwise, the process exits.

[0130] 7) Automatic width change processing is performed according to the automatic width change mode code FLAG_chgw. FLAG_chgw = 1 only changes the slab width in the rolling plan, and FLAG_chgw = 2 changes the slab width in the rolling plan and the target width of the finished product at the same time.

[0131] 8) The modified slab width and finished product target width information are written into the database.

[0132] 9) The rough rolling model performs relevant setting calculations based on the latest slab width and finished product target width, and the data is sent to L1 for production process control.

[0133] 10) End

[0134] Applying the above control process to the 1580 production line, when producing a certain steel grade, L3 issues slab width information of 1215mm, with a target width of 1195mm for the hot-rolled finished product, for rectangular billets. The furnace width gauge measures the actual average slab width of 1228mm. Data analysis confirms that the measured width is reliable, with actDataFlag = 2. The automatic width adjustment function for this steel grade is set to FLAG_chg = 2, enabling the online automatic width adjustment function. The slab width information is automatically updated to 1228mm, and the target width of the finished product is automatically adjusted to 1208mm. L2 then performs calculations based on the updated slab and finished product widths.

[0135] Those skilled in the art should recognize that the above embodiments are merely intended to illustrate the present invention and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A method for automatically modifying the target width online based on the measured width of a slab, characterized by: Establishing the reliability evaluation rules for automatic online dynamic identification and determination of slab width; Then, an online automatic modification rule for the width of the finished slab is established based on the automatic online dynamic identification and determination of the credibility evaluation rule of the measured slab width.

2. The method for automatically modifying the target width online based on the actual measured width of the slab according to claim 1, characterized in that: Establishing the automatic online dynamic recognition and determination of the credibility evaluation rule of the slab actual width specifically includes the following steps: S1, after the slabs are put into storage, the production control system sends the information of the slabs to be produced to the process control system; S2, the process control system receives and stores the slab information; S3, the width gauge measures the actual width of the slab and sends the measured periodic data to the process control system; S4, the process control system receives the periodic data, performs analysis and judgment, determines whether the actual width of the slab is available, sets a flag actDataFlag and assigns a value to it.

3. The method for automatically modifying the target width online based on the actual measured width of the slab according to claim 2, characterized in that: The step S4 specifically includes the following steps: S41, the process control system analyzes the shape of the slab and determines whether the shape of the slab is consistent with the slab information based on the measured width data of the slab; S42, if the shape of the slab is inconsistent with the slab information, it is determined that the measured slab width is unreliable, and the flag actDataFlag = 1; If the shape of the slab is consistent with the slab information, the deviation value between the width SWpdi of the slab information and the actual measured width SWact of the slab is calculated; S43, if the deviation value is within the set range, it is determined that the measured slab width is credible, and the flag actDataFlag = 2; if the deviation value exceeds the set range, the flag actDataFlag = -2; If the actual width data of the slab exceeds the allowable slab width range, the flag actDataFlag=-2; If the process control machine does not obtain the actual width data of the slab, the flag actDataFlag=-1; S43, when the measured slab width is credible and the flag actDataFlag=2, the online automatic modification rule of the finished slab width is established.

4. The method for automatically modifying the target width online based on the actual measured width of the slab according to claim 3, characterized in that: The slab information includes steel type, slab number, strip steel number, slab width, slab thickness, finished product width, finished product thickness and slab shape.

5. The method for automatically modifying the target width online based on the actual measured width of the slab according to claim 3, characterized in that: The shape analysis of the slab in step S41 specifically includes: The process control system divides the collected measured width data of the slab into three sections: head, middle and tail, and calculates the average value for each section. If the difference between the average values ​​of the measured widths of the head and tail sections exceeds 30 mm, it is judged that the slab is actually T-shaped. If it does not exceed 30 mm, it is judged that the slab is actually rectangular.

6. The method for automatically modifying the target width online based on the actual measured width of the slab according to claim 5, characterized in that: Establishing the online automatic modification rule for finished slab width includes the following steps: 1) Set the automatic online width change function flag; 2) Only modify the logic rules of slab width; 3) Automatically modify the logic rules of finished slab width and slab width; 4) The modified and updated data is synchronously written into the database; 5) During production, the process control system performs setting calculations based on the slab width at the final exit from the furnace and the finished slab width information, and the basic automation system accepts and executes the relevant setting values ​​to complete the rolling process.

7. The method for automatically modifying the target width online based on the actual measured width of the slab according to claim 6, characterized in that: The step 1) specifically includes: The process control system sets the automatic width change function flag FLAG_chgw according to the steel grade classification characteristics, and identifies different automatic width change modes through the flag FLAG_chgw; When FLAG_chgw=0, automatic width change is not performed; When FLAG_chgw=1, the slab width is automatically modified and the target width of the finished slab remains unchanged; When FLAG_chgw=2, the target width of the finished slab and the slab width are automatically modified.

8. The method for automatically modifying the target width online based on the actual measured width of the slab according to claim 7, characterized in that: The step 2) specifically includes: The process control system determines that the actual measured width of the slab is reliable under the premise that actDataFlag=2 and the automatic width change mode flag FLAG_chgw=1: A) For the rectangular slab Calculate the deviation value δSW=SWact-Swpdi between the width SWpdi of the slab information and the actual width SWact of the slab; If -30 mm ≤ δ SW ≤ 30 mm, the process control system replaces the original slab width SW pdi of the strip in the rolling plan with the measured slab width SW act , and the new actual slab width SW act is used for setting calculations during production process control; If δSW>30mm or δSW<-30mm, an alarm message "large slab width deviation" will be output, and the production staff will confirm and the automatic slab width modification process will be exited. The slab width information will still be the original slab information value; B) For the T-shaped slab Compare the measured head width SWact_h of the slab with the head slab width SWpdi_h of the slab information, and the measured tail width SWact_t of the slab with the tail slab width SWpdi_t of the slab information, and calculate the deviation values ​​δSW_h=SWact_h-SWpdi_h and δSW_t=SWact_t-SWpdi_t; If -30 mm ≤ δW_h ≤ 30 mm, the process control system replaces the original slab width SWpdi_h of the strip in the rolling plan with the measured slab width SWact_h, and the new actual slab width SWact_h is used for setting calculations during production process control; If -30 mm ≤ δW_t ≤ 30 mm, the process control system replaces the original slab width SWpdi_t of the strip in the rolling plan with the measured slab width SWpdi_t, and the new actual slab width SWpdi_t is used for setting calculations during production process control; If δSW_h or δSW_t is greater than 30mm, or δSW_h or δSW_t is less than -30mm, an information alarm is outputted "large slab width deviation" to prompt the production personnel to confirm, and the automatic modification process of the slab width is exited. The slab width information remains the value of the original slab information.

9. The method for automatically modifying the target width online based on the actual measured width of the slab according to claim 8, characterized in that: The step 3) specifically includes: The process control system determines that the actual measured width of the slab is reliable under the premise that actDataFlag=2 and the automatic width change mode flag FLAG_chgw=2: A) For the rectangular slab Calculate the deviation value δSW=SWact-Swpdi between the width SWpdi of the slab information and the actual width SWact of the slab; If -30 mm ≤ δ SW ≤ 30 mm, the process control system replaces the original slab width SW pdi of the strip in the rolling plan with the measured slab width SW act , and simultaneously corrects the target width CW pdi of the finished slab issued by the slab information in the rolling plan. The corrected CW_new = CW pdi + δ SW . The new actual slab width SW act and the new target width CW_new of the finished slab are used for setting and calculation during production process control. If δSW>30mm or δSW<-30mm, an alarm message "large slab width deviation" will be output to prompt the production staff to confirm and exit the automatic modification process. The slab width information and the target width of the finished product will remain the original slab information values. B) For the T-shaped slab Compare the measured head width SWact_h of the slab with the head slab width SWpdi_h of the slab information, and the measured tail width SWact_t of the slab with the tail slab width SWpdi_t of the slab information, and calculate the deviation values ​​δSW_h=SWact_h-SWpdi_h and δSW_t=SWact_t-SWpdi_t; If -30mm≤δSW_h≤30mm, and -30mm≤δSW_t≤30mm, then the process control system replaces the original slab width SWpdi_h / SWpdi_t of the strip in the rolling plan with the corresponding measured slab width SWact_h / SWpdi_t, and the target width CWpdi of the finished slab is corrected by taking the minimum value of the deviation between the measured width at the head and tail of the slab and the information width, that is, CW_new=CWpdi+min(δSW_h,δSW_t); the new actual slab width SWact_h / SWpdi_t and the new target width CW_new of the finished slab are used for setting and calculation during production process control; If -30 mm ≤ δW_t ≤ 30 mm, the process control system replaces the original slab width SWpdi_t of the strip in the rolling plan with the measured slab width SWpdi_t, and the new actual slab width SWpdi_t is used for setting calculations during production process control; If δSW_h or δSW_t is greater than 30mm, or δSW_h or δSW_t is less than -30mm, an information alarm is outputted "large slab width deviation" to prompt the production personnel to confirm, and the automatic modification process of the slab width is exited. The slab width information remains the value of the original slab information.

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