A rough rolling plate shape adaptive control method

Abstract

An embodiment of the present invention provides a rough rolling plate shape adaptive control method, comprising: before the current slab enters the rough rolling mill for the first pass to bite the steel, determining the vertical roller center offset correction compensation value and the basic roll gap deviation feedback inheritance value corresponding to the current slab based on the wedge data and the rough rolling roll gap deviation setting value recorded in the database before the current slab; obtaining the manually set pass roll gap deviation input value corresponding to each pass of the rough rolling mill; obtaining the temperature difference on both sides of the slab in the width direction before entering each pass for rolling, and determining the temperature difference roll gap compensation value corresponding to the pass; determining the center line roll gap compensation value of the even pass based on the slab center line measured at the odd pass before each even pass; determining the horizontal roll gap deviation setting correction value corresponding to the pass, and setting the roll gap of the horizontal roll, and setting the position of the operating side vertical roller and the transmission side vertical roller of the rough rolling mill according to the vertical roller center offset correction compensation value corresponding to the pass.

Description

Technical Field

[0001] The present invention relates to the field of hot-rolled strip production, and in particular to a rough-rolled strip shape adaptive control method. Background Art

[0002] The rough rolling process in the hot strip rolling production line mainly performs three main functions: thinning the slab to reduce the finishing rolling load, adjusting the width of the finished product and controlling the temperature of the microstructure. However, in the actual production process, the abnormal shape of the intermediate slab after the rough rolling process, especially the large wedge shape and the sickle bend at the head and tail, causes quality problems and production failures in the downstream finishing rolling process.

[0003] In order to ensure smooth production and improve the output of the rolling mill and the quality of the physical finished products, under the condition that the plate shape capacity of the finishing mill is limited, and the rough rolling plate shape control only relies on manual judgment and adjustment, which lacks timeliness and accuracy, it is necessary to carry out targeted control of the rough rolling process due to the unstable temperature difference on both sides of the billet and the plate shape changes during the rough rolling process. Therefore, a rough rolling shape adaptive control method is invented to improve the flatness of the intermediate billet and provide the downstream process, especially the finishing rolling process, with an intermediate billet with stable plate shape, so as to improve the plate shape quality of the finished plate and strip.

[0004] In the process of implementing the present invention, the applicant discovered that the prior art has at least the following problems:

[0005] In actual production, the shape of the intermediate billet after the rough rolling process is abnormal, causing quality problems and production failures in the downstream finishing rolling process. Summary of the Invention

[0006] The embodiment of the present invention provides a rough rolling plate shape adaptive control method to solve the problem that the intermediate billet plate shape is abnormal after the rough rolling process in actual production process, causing quality problems and production failures in the downstream finishing rolling process.

[0007] To achieve the above objectives, on the one hand, an embodiment of the present invention provides a rough rolling flatness adaptive control method, which is applied to a reversible rough rolling mill, comprising:

[0008] Before the current slab enters the roughing mill for the first pass, the database is requested to send the wedge data of N historical slabs. The database returns M wedge data. Based on the M wedge data, the vertical roller center offset correction compensation value ΔC corresponding to the current slab is determined. V ; Wherein, the M wedge-shaped data correspond one by one to the most recent M continuous historical slabs rolled by the current finishing roll; M is less than or equal to N;

[0009] Before the current slab enters the roughing mill for the first pass, the roughing roll gap deviation setting value of each pass of the previous slab in the roughing mill is obtained, and the basic roll gap deviation feedback inheritance value GI corresponding to the current slab is determined based on the obtained roughing roll gap deviation setting value of each pass;

[0010] Obtain the manually set pass roll gap deviation input value GHi corresponding to each pass of the roughing mill;

[0011] For each pass of the current slab in the roughing mill, the temperature difference between the two sides of the slab in the width direction before entering the rolling pass is obtained in real time, and the temperature difference roll gap compensation value GTi corresponding to the pass is determined based on the temperature difference between the two sides of the slab in the width direction before the rolling pass;

[0012] At each odd-numbered pass of the roughing rolling of the current slab, the center line of the current slab is measured when the current slab exits the roughing mill; before the current slab enters each even-numbered pass of the roughing rolling, the center line roll gap compensation value GCi corresponding to the even-numbered pass is determined based on the slab center line measured at the previous odd-numbered pass; the center line roll gap compensation value GCi corresponding to the odd-numbered pass of the current slab in the roughing mill is set to 0;

[0013] For each pass of the current slab in the roughing mill, the horizontal roll gap deviation setting correction value ΔG corresponding to the pass is determined according to the basic roll gap deviation feedback inheritance value GI, the manually set pass roll gap deviation input value GHi corresponding to the pass, the temperature difference roll gap compensation value GTi and the centerline roll gap compensation value GCi. i ;

[0014] For each pass of the current slab in the roughing mill, the horizontal roll gap deviation corresponding to the pass is set to a correction value ΔG i , as the roll gap increase value of the operating side relative to the driving side of the horizontal roll of the roughing mill, the roll gap of the horizontal roll is set;

[0015] For each odd-numbered pass of the current slab in the roughing mill, the set slab width corresponding to the odd-numbered pass and the vertical roll center offset correction compensation value ΔC are used. V , determine the respective opening degrees of the vertical roll on the operating side of the roughing mill and the vertical roll on the driving side, set the horizontal positions of the vertical roll on the operating side of the roughing mill and the vertical roll on the driving side according to the respective opening degrees of the vertical roll on the operating side of the roughing mill and the vertical roll on the driving side; for each even-numbered pass of the current slab in the roughing mill, set the horizontal positions of the vertical roll on the operating side of the roughing mill and the vertical roll on the driving side to the position with the largest opening degree.

[0016] Furthermore, according to the obtained roughing roll gap deviation setting value of each pass, a basic roll gap deviation feedback inheritance value GI corresponding to the current slab is determined, including:

[0017] The average value of the roughing roll gap deviation setting values ​​corresponding to all the passes is used as the basic roll gap deviation feedback inheritance value GI corresponding to the current slab.

[0018] Furthermore, for each pass of the current slab in the roughing mill, the temperature difference between both sides of the slab in the width direction before entering the rolling pass is obtained in real time, including:

[0019] For the first pass of the current slab in the roughing mill, the difference between the pyrometers on both sides of the outlet of the descaling box after the furnace when the current slab is at the outlet of the descaling box after the furnace is obtained, which is used as the temperature difference on both sides of the slab in the width direction before entering the first pass of rolling. For other passes of the current slab in the roughing mill except the first pass, the difference between the pyrometers on both sides of the entrance of the roughing mill of the other passes is obtained when the current slab is at the entrance of the roughing mill of the other passes, which is used as the temperature difference on both sides of the slab in the width direction before entering the other pass of rolling.

[0020] Furthermore, according to the temperature difference between the two sides of the slab in the width direction before the rolling of the pass, the temperature difference roll gap compensation value GTi corresponding to the pass is determined, including:

[0021] Calculate the temperature difference roller gap compensation value GTi corresponding to the pass according to the following formula:

[0022]

[0023] Wherein, ΔT is the temperature difference on both sides of the slab width direction; K is the weighting coefficient; and C is the calculation constant of the plate shape temperature difference model.

[0024] Furthermore, before the current slab enters each even-numbered pass of rough rolling, the centerline roll gap compensation value GCi corresponding to the even-numbered pass is determined based on the slab centerline measured in the previous odd-numbered pass, including:

[0025] Determining the deviation value of the slab centerline relative to the centerline of the shape meter as the centerline deviation value corresponding to the even-numbered passes; wherein the shape meter is arranged at the outlet side of the roughing mill for the odd-numbered passes;

[0026] According to the material, width and thickness of the current slab, the preset deviation value weight table is checked to determine the deviation value weight corresponding to the even-numbered pass, and the deviation value weight corresponding to the even-numbered pass is multiplied by the corresponding center line deviation value to obtain the center line roller gap compensation value GCi corresponding to the pass.

[0027] Furthermore, for each pass of the current slab in the roughing mill, the horizontal roll gap deviation setting correction value ΔG corresponding to the pass is determined according to the basic roll gap deviation feedback inheritance value GI, the manually set pass roll gap deviation input value GHi corresponding to the pass, the temperature difference roll gap compensation value GTi and the centerline roll gap compensation value GCi. i ,include:

[0028] For each pass of the current slab in the roughing mill, the preset roll gap deviation factor coefficient table is checked according to the material, width and thickness of the current slab to determine the roll gap deviation factor coefficients corresponding to the basic roll gap deviation feedback inheritance value GI, the roll gap deviation input value GHi manually set for the pass, the temperature difference roll gap compensation value GTi and the center line roll gap compensation value GCi. Based on the corresponding roll gap deviation factor coefficients, the weighted sum of the basic roll gap deviation feedback inheritance value GI, the roll gap deviation input value GHi manually set for the pass, the temperature difference roll gap compensation value GTi and the center line roll gap compensation value GCi is calculated as the horizontal roll gap deviation setting correction value ΔG corresponding to the pass. i .

[0029] Further, according to the M wedge data, the vertical roller center offset correction compensation value ΔC corresponding to the current slab is determined. V ,include:

[0030] When M=0, the vertical roller center offset compensation value ΔC corresponding to the current slab is corrected V Set to 0;

[0031] When M is greater than 0, calculate the average value of the M wedge-shaped data and calculate the vertical roller center offset correction compensation value ΔC according to the following formula: V :

[0032] Where ΔW AVG is the average value of the M wedge data; α is the fitting correction constant; W is the target wedge value.

[0033] Furthermore, if the vertical roller center offset correction compensation value ΔC corresponding to the current slab is V If the offset compensation value of the vertical roller center is greater than the preset maximum value, the vertical roller center offset compensation value ΔC corresponding to the current slab will be V Set to the preset maximum value of the roller center offset correction compensation value.

[0034] Furthermore, for each odd-numbered pass of the current slab in the roughing mill, the set slab width corresponding to the odd-numbered pass and the vertical roll center offset correction compensation value ΔC are used. V , determine the respective opening degrees of the roughing mill operating side vertical roll and the transmission side vertical roll, and set the horizontal positions of the roughing mill operating side vertical roll and the transmission side vertical roll according to their respective opening degrees, including:

[0035] Add half of the set plate width corresponding to the odd number of passes to the vertical roller center offset correction compensation value ΔC VThe obtained value is used as the opening degree of the vertical roller on the operating side of the roughing mill, and the horizontal position of the vertical roller on the operating side of the roughing mill is set to the position specified by the opening degree of the vertical roller on the operating side of the roughing mill;

[0036] Subtract the vertical roller center offset compensation value ΔC from half of the set plate width corresponding to the odd pass V The obtained value is used as the opening degree of the vertical roller on the transmission side of the roughing mill, and the horizontal position of the vertical roller on the transmission side of the roughing mill is set to the position specified by the opening degree of the vertical roller on the transmission side of the roughing mill.

[0037] Furthermore, the method comprises:

[0038] After the current slab is discharged from the furnace, the roughing roll gap deviation setting values ​​corresponding to all passes of the previous slab that has completed rough rolling in the roughing mill, which are recorded in the database, are obtained, and the average value of the roughing roll gap deviation setting values ​​corresponding to all the obtained passes is used as the basic roll gap deviation feedback inheritance value GI corresponding to the current slab;

[0039] Read the HMI operation screen to manually set the pass roll gap deviation input value GHi;

[0040] When the pass number is 1, the difference between the pyrometer values ​​on both sides of the descaling box outlet after the furnace is used as the temperature difference on both sides of the slab width direction, and the temperature difference roller gap compensation value GTi of the current pass is calculated according to the temperature difference on both sides of the slab width direction through formula (1);

[0041] Wherein, ΔT is the temperature difference on both sides of the slab width direction; K is the weighting coefficient; C is the calculation constant of the plate shape temperature difference model;

[0042] When the pass number is 1, the centerline roll gap compensation value GCi is set to 0;

[0043] Before the first pass of biting steel, calculate the correction value of the horizontal roll gap deviation setting of the first pass:

[0044] ΔG i＝1 =j1GI+j2GHi+j3GTi+j4GCi (3)

[0045] Among them, j1, j2, j3, and j4 are the roll gap deviation factor coefficients in the roll gap deviation correction process calculated by the model;

[0046] After the first rolling pass is completed, for all subsequent passes, the temperature difference on both sides of the slab width direction corresponding to the pass is read by a pyrometer at the entrance side of each pass, and the temperature difference roll gap compensation value GTi of the pass is calculated based on the temperature difference on both sides of the slab width direction corresponding to the pass;

[0047] When the pass number is even, obtain the plate shape centerline of the previous pass at the roughing mill outlet side, and calculate the centerline roll gap compensation value GCi corresponding to the pass number when the pass number is even based on the plate shape centerline of the previous pass at the roughing mill outlet side; the centerline roll gap compensation value GCi corresponding to the pass number when the pass number is odd is set to 0;

[0048] The horizontal roll gap deviation setting correction value ΔG of each pass is calculated by formula (3): i ;

[0049] For each pass of the current slab in the roughing mill, the horizontal roll gap deviation corresponding to the pass is set to a correction value ΔG i , as the roll gap increase value of the operating side relative to the driving side of the horizontal roll of the roughing mill, the roll gap of the horizontal roll is set;

[0050] The finishing roll change signal in the first-level control signal is used as the finishing plate shape database storage signal. When the finishing rolling is completed, the average value ΔW of the wedge shape data of three consecutive slabs is updated in real time. AVG , calculate the vertical roller center offset compensation value ΔC by formula (2) V ;

[0051] During the correction process of vertical roller alignment, set the vertical roller center offset correction compensation value ΔC V The output upper limit is the preset maximum value of the vertical roller center deviation correction compensation value, the vertical roller center deviation correction compensation value ΔC V As the value increases, the rolling center line of the vertical roll shifts toward the operating side, the opening of the vertical roll on the operating side increases, and the opening of the vertical roll on the transmission side decreases.

[0052] The above technical solution has the following beneficial effects: by reading roughing and finishing roll shape quality data from the database, such as wedge data and roughing roll gap deviation settings, roll gap compensation is calculated. The roll gap deviation is calculated by combining roll gap compensation inherited from shape feedback, manually corrected roll gap compensation, temperature-dependent roll gap deviation, and centerline deviation values. The roll gap deviation for roughing passes is then output for flat roll shape control. The roll gap compensation value for vertical roll centering is also calculated and output, improving finished product shape quality through overall centerline adjustment. This improves the accuracy and timeliness of roughing roll shape adjustment, reducing the amount of manual adjustment required. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0054] Figure 1 This is a flow chart of a rough rolling plate shape adaptive control method according to one embodiment of the present invention;

[0055] Figure 2 This is a schematic diagram of the positional relationship among the horizontal rollers, vertical rollers, pyrometers, and slabs according to one embodiment of the present invention. DETAILED DESCRIPTION

[0056] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0057] On the one hand, if Figure 1 As shown, an embodiment of the present invention provides a rough rolling plate shape adaptive control method, which is applied to a reversible rough rolling mill, comprising:

[0058] Step S10: Before the current slab enters the roughing mill for the first pass, the database is requested to send the wedge data of N historical slabs. The database returns M wedge data. Based on the M wedge data, the vertical roller center offset correction compensation value ΔC corresponding to the current slab is determined. V ; Wherein, the M wedge-shaped data correspond one by one to the most recent M continuous historical slabs rolled by the current finishing roll; M is less than or equal to N;

[0059] Step S11, before the current slab enters the roughing mill for the first pass, obtaining the roughing roll gap deviation setting value of each pass of the previous slab in the roughing mill, and determining the basic roll gap deviation feedback inheritance value GI corresponding to the current slab based on the obtained roughing roll gap deviation setting value of each pass;

[0060] Step S12, obtaining the manually set pass roll gap deviation input value GHi corresponding to each pass of the roughing mill;

[0061] Step S13, for each pass of the current slab in the roughing mill, obtaining in real time the temperature difference between the two sides of the slab in the width direction before entering the rolling pass, and determining the temperature difference roll gap compensation value GTi corresponding to the pass based on the temperature difference between the two sides of the slab in the width direction before the rolling pass;

[0062] Step S14, measuring the centerline of the current slab when it exits the roughing mill at each odd-numbered pass of the roughing rolling of the current slab, and determining the centerline roll gap compensation value GCi corresponding to each even-numbered pass of the current slab based on the slab centerline measured at the previous odd-numbered pass before the current slab enters each even-numbered pass of the roughing rolling; the centerline roll gap compensation value GCi corresponding to the odd-numbered pass of the current slab in the roughing mill is set to 0;

[0063] Step S15: for each pass of the current slab in the roughing mill, the horizontal roll gap deviation setting correction value ΔG corresponding to the pass is determined based on the basic roll gap deviation feedback inheritance value GI, the manually set pass roll gap deviation input value GHi corresponding to the pass, the temperature difference roll gap compensation value GTi and the centerline roll gap compensation value GCi. i ;

[0064] Step S16: for each pass of the current slab in the roughing mill, the horizontal roll gap deviation corresponding to the pass is set to a correction value ΔG. i , as the roll gap increase value of the operating side relative to the driving side of the horizontal roll of the roughing mill, the roll gap of the horizontal roll is set;

[0065] Step S17: for each odd-numbered pass of the current slab in the roughing mill, the set slab width corresponding to the odd-numbered pass and the vertical roll center offset correction compensation value ΔC are calculated. V , determine the respective opening degrees of the vertical roll on the operating side of the roughing mill and the vertical roll on the driving side, set the horizontal positions of the vertical roll on the operating side of the roughing mill and the vertical roll on the driving side according to the respective opening degrees of the vertical roll on the operating side of the roughing mill and the vertical roll on the driving side; for each even-numbered pass of the current slab in the roughing mill, set the horizontal positions of the vertical roll on the operating side of the roughing mill and the vertical roll on the driving side to the position with the largest opening degree.

[0066] In some embodiments, the roughing mill is specifically a reversible roughing mill. The inlet side and outlet side of the roughing mill in the embodiments need to be determined based on the roughing mill pass being executed. The inlet side of the roughing mill for each pass is the side where the slab of the pass enters the roughing mill, and the outlet side of the roughing mill for each pass is the side where the slab of the pass exits the roughing mill. After each slab completes roughing and finishing, the corresponding quality data and assembly line process parameters during roughing and finishing will be written into the database; for example, when each slab completes finishing, the wedge data of the slab will be written into the database; when each slab completes roughing, the roughing roll gap deviation setting value corresponding to each pass of the slab during roughing will be written into the database. Before the slab enters the first pass of the roughing mill after each finishing roll change, the vertical roll center offset correction compensation value ΔC corresponding to the slab is determined. VWhen using the wedge data of the slab that has been finished after the most recent finishing roll change before the slab, the wedge data of the slab that has been finished before the most recent finishing roll change before the slab must be used, and the wedge data of the slab that has been finished before the most recent finishing roll change before the slab must not be used. This is because the current slab will be rolled using the finishing mill rolls after the most recent finishing roll change before the current slab during finishing rolling. Therefore, the wedge data of the slab that has been finished before the most recent finishing roll change before the current slab is the data from the rolling of the previous finishing mill rolls, and is no longer applicable to the current slab. Therefore, before the current slab enters the first pass of the roughing mill, the wedge data of the latest several slabs that have been added to the database and that have been finished before the current slab and after the last finishing roll change are obtained. Based on the obtained wedge data of the latest several slabs, the vertical roller center offset correction compensation value ΔC corresponding to the current slab is determined. V The reason why N wedge data are requested from the database storing the wedge data of historical slabs and M wedge data are returned from the database, and M is less than or equal to N, is that when the first slab after the finishing roll change enters the roughing mill, there is no historical slab that has been finished by the current finishing rolls. Therefore, there is no wedge data in the database that matches the most recent historical slab that has been finished by the current finishing rolls. The number of wedge data of historical slabs actually obtained is 0. At this time, the vertical roll center offset correction compensation value ΔC corresponding to the first slab can be used. V Set to 0; when the second slab enters the roughing mill after the finishing roll change, the previous slab is being rolled in the finishing mill. At this time, there is no wedge data in the database that matches the most recent historical slab rolled by the current finishing roll. The number of wedge data M of the historical slabs actually obtained is 0. At this time, the vertical roll center offset correction compensation value ΔC corresponding to the second slab can be used. VSet to 0; when the third slab after the finishing roll change enters the roughing mill, the second slab in front of it is rolled in the finishing mill, and the first slab in front of it has completed finishing rolling. At this time, there is a wedge data in the database that meets the latest historical slab rolled by the current finishing roll. The database can return 1 wedge data, and M is 1; when the fourth slab after the finishing roll change enters the roughing mill, the third slab in front of it is rolled in the finishing mill, and the first and second slabs in front of it have completed finishing rolling. At this time, there are two wedge data in the database that meet the latest historical slab rolled by the current finishing roll. Wedge data: The database can return 2 wedge data, M is 2; when the fifth slab after the finishing roll change enters the roughing mill, the fourth slab in front of it is rolled in the finishing mill, and the first, second and third slabs in front of it have completed finishing. At this time, there are three wedge data in the database that match the most recent historical slabs rolled by the current finishing rolls. The database can return 3 wedge data, M is 3; and so on. When the number of wedge data in the database that match the most recent historical slabs rolled by the current finishing rolls exceeds N, the database returns N wedge data, and M = N. When M is greater than 0, the vertical roller center offset correction compensation value ΔC is determined based on the M wedge data obtained. V Value. When each slab is rolled in the roughing mill, the roughing roll gap deviation setting value corresponding to the slab in each pass of the roughing mill is written into the database; for each current slab that has just arrived at the roughing mill and is ready to start the first pass of rolling, the roughing roll gap deviation setting value of each pass of the roughing mill of the last slab that has completed rolling in the roughing mill is obtained, and the basic roll gap deviation feedback inheritance value GI corresponding to the current slab is determined based on the roughing roll gap deviation setting values ​​corresponding to all the passes obtained. The wedge data of the slab written into the database is obtained by scanning and measuring the strip cross-section by the plate shape multifunctional instrument at the outlet side of the finishing mill. The roughing roll gap deviation setting value of the slab written into the database is the roll gap deviation data of each pass after the upper piece of steel in the roughing area is rolled, and is stored in the database; the manually set pass roll gap deviation input value GHi can be obtained from the monitoring software of the production line, for example, the set value displayed on the human-machine monitoring screen of the monitoring software can be read. Pyrometers are provided on both sides of the outlet of the descaling box after the furnace, such as Figure 2As shown, pyrometers are also provided on both sides of the entrance and exit of the roughing mill, and the temperature difference on both sides of the slab width direction before each rolling pass can be obtained by the pyrometers. The flatness meter is only provided downstream of the roughing mill, i.e., on the exit side of the odd-numbered passes, so it can only obtain the slab centerline measured when the current slab exits the roughing mill in the previous odd-numbered pass, and use this slab centerline before the even-numbered pass to determine the centerline roll gap compensation value GCi corresponding to the even-numbered pass. Before the odd-numbered pass, since there is no corresponding slab centerline on the exit side of the previous even-numbered pass, the centerline roll gap compensation value GCi corresponding to the odd-numbered pass is set to 0. Finally, for each pass, the horizontal roll gap deviation setting correction value ΔG corresponding to the pass is determined based on the basic roll gap deviation feedback inheritance value GI, the manually set pass roll gap deviation input value GHi corresponding to the pass, the temperature difference roll gap compensation value GTi, and the centerline roll gap compensation value GCi. i , set the correction value ΔG for the horizontal roll gap deviation corresponding to the pass i , as the roll gap increase value of the operating side relative to the transmission side of the horizontal roll of the roughing mill, the roll gap of the horizontal roll is set; the roughing mill is only equipped with vertical rolls on the entrance side of the odd-numbered passes, so it is only necessary to correct the compensation value ΔC according to the set plate width corresponding to the odd-numbered passes and the vertical roll center offset before the odd-numbered passes. V , adjust the opening degree of the vertical rollers on both sides.

[0067] The embodiments of the present invention have the following technical effects: by reading roughing and finishing roll shape quality data from a database, such as wedge shape data, roll gap compensation is calculated. The roll gap deviation is calculated by combining roll gap compensation inherited from roll shape feedback, manual roll gap compensation, temperature-dependent roll gap deviation, and centerline deviation values. The roll gap deviation for the roughing pass is output for flat roll shape control. Simultaneously, the roll gap compensation value for vertical roll centering is calculated and output, improving the finished product shape quality through overall centerline adjustment. This improves the accuracy and timeliness of shape adjustment for each roughing pass and reduces the amount of manual adjustment.

[0068] Furthermore, according to the obtained roughing roll gap deviation setting value of each pass, a basic roll gap deviation feedback inheritance value GI corresponding to the current slab is determined, including:

[0069] The average value of the roughing roll gap deviation setting values ​​corresponding to all the passes is used as the basic roll gap deviation feedback inheritance value GI corresponding to the current slab.

[0070] In some embodiments, on a production line with continuous production, the dynamic parameters of the production line generally do not change significantly within a certain period of time and conform to the mean reversion property. Based on this, the average value of the roughing roll gap deviation setting value of the slab that has completed rough rolling before the current slab is used as the basic roll gap deviation feedback inheritance value GI corresponding to the current slab, and then combined with the values ​​of other factors to adjust the horizontal roll gap deviation setting correction value ΔG corresponding to each pass. i , further adjustments can be made on the basis of the relatively accurate basic roll gap deviation feedback inheritance value GI to improve the adjustment accuracy.

[0071] Furthermore, for each pass of the current slab in the roughing mill, the temperature difference between both sides of the slab in the width direction before entering the rolling pass is obtained in real time, including:

[0072] For the first pass of the current slab in the roughing mill, the difference between the pyrometers on both sides of the outlet of the descaling box after the furnace when the current slab is at the outlet of the descaling box after the furnace is obtained, which is used as the temperature difference on both sides of the slab in the width direction before entering the first pass of rolling. For other passes of the current slab in the roughing mill except the first pass, the difference between the pyrometers on both sides of the entrance of the roughing mill of the other passes is obtained when the current slab is at the entrance of the roughing mill of the other passes, which is used as the temperature difference on both sides of the slab in the width direction before entering the other pass of rolling.

[0073] In some embodiments, because the slab surface temperature decreases some time after leaving the descaling box exit, the temperature difference across the slab width measured at the descaling box exit is more accurate than the temperature difference measured before the roughing mill entrance. This allows for more accurate calculation of the temperature difference roll gap compensation value for the first pass. For other passes, the temperature difference across the slab width is measured at the roughing mill entrance for the corresponding pass.

[0074] Furthermore, according to the temperature difference between the two sides of the slab in the width direction before the rolling of the pass, the temperature difference roll gap compensation value GTi corresponding to the pass is determined, including:

[0075] The temperature difference roller gap compensation value GTi corresponding to the pass is calculated according to the following formula (1).

[0076] The weighting coefficient K can be determined by looking up the preset weighting coefficient table according to the slab material, thickness, and width. The weighting coefficient table can be determined by pre-testing slabs of various materials, thicknesses, and widths. The size of is related to the performance of the rolling mill. For example, the debugging experience value of 1450 is 2.5. Different rolling mills use different data. The temperature difference on both sides of the fixed slab width is 10℃, and the same C value is output by different rolling mills. When GTi is the same, the slab rolled out by the mill with weak plate shape performance is still sickle-shaped, and it is necessary to increase C value, which increases the output roll gap deviation data and strengthens the plate shape control Control effect.

[0077] Furthermore, before the current slab enters each even-numbered pass of rough rolling, the centerline roll gap compensation value GCi corresponding to the even-numbered pass is determined based on the slab centerline measured in the previous odd-numbered pass, including:

[0078] Determining the deviation value of the slab centerline relative to the centerline of the shape meter as the centerline deviation value corresponding to the even-numbered passes; wherein the shape meter is arranged at the outlet side of the roughing mill for the odd-numbered passes;

[0079] According to the material, width and thickness of the current slab, the preset deviation value weight table is checked to determine the deviation value weight corresponding to the even-numbered pass, and the deviation value weight corresponding to the even-numbered pass is multiplied by the corresponding center line deviation value to obtain the center line roller gap compensation value GCi corresponding to the pass.

[0080] In some embodiments, a shape meter is installed at the exit of the roughing mill for odd-numbered passes. Therefore, the shape meter can only measure the centerline of the slab after the odd-numbered passes are completed. During even-numbered passes, the slab centerline measured during the previous odd-numbered pass is obtained and subtracted from the shape meter centerline to obtain the centerline deviation value. Since the centerline deviation value is only available for even-numbered passes, the corresponding centerline roll gap compensation value GCi can only be obtained for even-numbered passes. The centerline roll gap compensation value GCi for odd-numbered passes is set to 0. The deviation value weight table can be pre-determined through experiments on slabs of different materials, widths, and thicknesses. Deviation weights are typically assigned smaller weights to smaller and larger passes than to intermediate passes. For example, if a total of five passes are required, then for a slab of the same material, width, and thickness, the weights for passes 1 and 5 are smaller than for pass 3. For example, the deviation weight for pass 1 is 30%, for pass 3 is 50%, and for pass 5 is 20%. Because the slab is still relatively thick during the first pass, the smaller weight is due to the fact that the effects of the temperature difference on both sides of the slab have not yet fully manifested through thinning, leaving some room for adjustment during subsequent rolling. If the weight is too large, the first pass will be too thin, and subsequent passes will not be able to fully correct the deviation. In the third pass, the slab has already been thinned, so a larger weight is used to facilitate wedge adjustment. In the fifth pass, the slab's shape is essentially stable, so a smaller weight is used to avoid excessive wedge adjustment, which could increase the thickness difference between the two sides of the rolled intermediate slab and affect the downstream finishing process.

[0081] Furthermore, for each pass of the current slab in the roughing mill, the horizontal roll gap deviation setting correction value ΔG corresponding to the pass is determined according to the basic roll gap deviation feedback inheritance value GI, the manually set pass roll gap deviation input value GHi corresponding to the pass, the temperature difference roll gap compensation value GTi and the centerline roll gap compensation value GCi. i ,include:

[0082] For each pass of the current slab in the roughing mill, the preset roll gap deviation factor coefficient table is checked according to the material, width and thickness of the current slab to determine the roll gap deviation factor coefficients corresponding to the basic roll gap deviation feedback inheritance value GI, the roll gap deviation input value GHi manually set for the pass, the temperature difference roll gap compensation value GTi and the center line roll gap compensation value GCi. Based on the corresponding roll gap deviation factor coefficients, the weighted sum of the basic roll gap deviation feedback inheritance value GI, the roll gap deviation input value GHi manually set for the pass, the temperature difference roll gap compensation value GTi and the center line roll gap compensation value GCi is calculated as the horizontal roll gap deviation setting correction value ΔG corresponding to the pass. i .

[0083] In some embodiments, the horizontal roller gap deviation setting correction value ΔG of the pass is calculated according to the following formula (3): i The roll gap deviation factor coefficient table can be pre-determined through experiments for slabs of different materials, widths, and thicknesses. The roll gap deviation factor coefficients for the inherited basic roll gap deviation feedback value GI, the manually set pass roll gap deviation input value GHi, the temperature difference roll gap compensation value GTi, and the centerline roll gap compensation value GCi are all smaller for small and large passes than for intermediate passes. Because the slab is still relatively thick in the small-numbered passes, the small roll gap deviation factor coefficient is due to the fact that the influence of the temperature difference on both sides of the slab has not yet been fully manifested through thinning, and a certain amount of adjustment is reserved for subsequent rolling. If the roll gap deviation factor coefficient is too biased for the large and small-numbered passes (such as the first pass), the subsequent passes cannot be completely corrected; the slab in the middle-numbered passes (such as the third pass) has been thinned, and the use of the weight of the roll gap deviation factor coefficient is conducive to adjusting the wedge shape; the shape of the slab in the large-numbered passes (such as the fifth pass) is basically stable, and a smaller roll gap deviation factor coefficient is used to avoid excessive wedge adjustment, which will increase the thickness difference on both sides of the rolled intermediate slab and affect the rolling of the downstream finishing process.

[0084] Further, according to the M wedge data, the vertical roller center offset correction compensation value ΔC corresponding to the current slab is determined. V ,include:

[0085] When M=0, the vertical roller center offset compensation value ΔC corresponding to the current slab is corrected V Set to 0;

[0086] When M is greater than 0, the average value of the M wedge-shaped data is calculated, and the vertical roller center offset correction compensation value ΔC is calculated according to formula (2): V . Among them, ΔW AVGis the average value of the M wedge data; α is the fitting correction constant; W is the target wedge value, where α is the fitting correction constant, which is determined based on on-site debugging experience; W is the target wedge value, which is a preset value issued by the system and is given to the rolling mill along with the slab data; for example, if it is desired to obtain the wedge data of the last three slabs, the current wedge target value of this steel is ±30 microns, and the final wedge is required to hit in the range of +30 microns to -30 microns, the absolute value of the target wedge is taken during model calculation and calculated with the average of the wedge data of the last three slabs; the vertical roller center offset correction compensation value ΔC determined based on this formula is V Adjusting the vertical rollers significantly enhances the effect of the flat rollers in controlling the wedge shape. The roll gap is independently controlled by the deviation of the roll gap on both sides. The center of the vertical roller is then biased toward the side with the larger wedge shape, which can reduce the thickness on the side with the larger thickness and even out the thickness difference on both sides to achieve the effect of controlling the wedge shape. In the initial stage after the finishing roll change, the database still contains the wedge shape data of the slab rolled by the current finishing roll. At this time, the M returned by the database is 0, and the vertical roller center offset correction compensation value ΔC is used. V Set to 0; it is also possible that only the wedge data of one nearest slab can be obtained, then the wedge data of the nearest slab is used as the average of the M wedge data; it is also possible that only the wedge data of two nearest slabs can be obtained, then the average of the wedge data of the two nearest slabs is used as the average of the M wedge data; it is also possible that the actual number of slabs M obtained from the wedge data is equal to the expected number of slabs N, then the average of the N wedge data is directly used.

[0087] Furthermore, if the vertical roller center offset correction compensation value ΔC corresponding to the current slab is V If the offset compensation value of the vertical roller center is greater than the preset maximum value, the vertical roller center offset compensation value ΔC corresponding to the current slab will be V Set to the preset maximum value of the roller center offset correction compensation value.

[0088] In some embodiments, a preset maximum value of the vertical roller center offset correction compensation value is used to limit the vertical roller center offset correction compensation value corresponding to the current slab to prevent the vertical roller from being adjusted beyond the limit.

[0089] Furthermore, for each odd-numbered pass of the current slab in the roughing mill, the set slab width corresponding to the odd-numbered pass and the vertical roll center offset correction compensation value ΔC are used. V , determine the respective opening degrees of the roughing mill operating side vertical roll and the transmission side vertical roll, and set the horizontal positions of the roughing mill operating side vertical roll and the transmission side vertical roll according to their respective opening degrees, including:

[0090] Add half of the set plate width corresponding to the odd number of passes to the vertical roller center offset correction compensation value ΔC VThe obtained value is used as the opening degree of the vertical roller on the operating side of the roughing mill, and the horizontal position of the vertical roller on the operating side of the roughing mill is set to the position specified by the opening degree of the vertical roller on the operating side of the roughing mill;

[0091] Subtract the vertical roller center offset compensation value ΔC from half of the set plate width corresponding to the odd pass V The obtained value is used as the opening degree of the transmission side vertical roller of the roughing mill, and the horizontal position of the transmission side vertical roller of the roughing mill is set to the position specified by the opening degree of the transmission side vertical roller of the roughing mill.

[0092] Furthermore, the method comprises:

[0093] After the current slab is discharged from the furnace, the roughing roll gap deviation setting values ​​corresponding to all passes of the previous slab that has completed rough rolling in the roughing mill, which are recorded in the database, are obtained, and the average value of the roughing roll gap deviation setting values ​​corresponding to all the obtained passes is used as the basic roll gap deviation feedback inheritance value GI corresponding to the current slab;

[0094] Read the HMI operation screen to manually set the pass roll gap deviation input value GHi;

[0095] When the pass number is 1, the difference between the pyrometer values ​​on both sides of the descaling box outlet after the furnace is used as the temperature difference on both sides of the slab width direction, and the temperature difference roller gap compensation value GTi of the current pass is calculated according to the temperature difference on both sides of the slab width direction through formula (1);

[0096] When the pass number is 1, the centerline roll gap compensation value GCi is set to 0;

[0097] Before the first pass of biting steel, the correction value of the horizontal roll gap deviation of the first pass is calculated according to formula (3);

[0098] After the first rolling pass is completed, for all subsequent passes, the temperature difference on both sides of the slab width direction corresponding to the pass is read by a pyrometer at the entrance side of each pass, and the temperature difference roll gap compensation value GTi of the pass is calculated based on the temperature difference on both sides of the slab width direction corresponding to the pass;

[0099] When the pass number is even, obtain the plate shape centerline of the previous pass at the roughing mill outlet side, and calculate the centerline roll gap compensation value GCi corresponding to the pass number when the pass number is even based on the plate shape centerline of the previous pass at the roughing mill outlet side; the centerline roll gap compensation value GCi corresponding to the pass number when the pass number is odd is set to 0;

[0100] According to formula (3), the horizontal roll gap deviation setting correction value ΔG of each pass is calculated i ;

[0101] For each pass of the current slab in the roughing mill, the horizontal roll gap deviation corresponding to the pass is set to a correction value ΔG i , as the roll gap increase value of the operating side relative to the driving side of the horizontal roll of the roughing mill, the roll gap of the horizontal roll is set;

[0102] The finishing roll change signal in the first-level control signal is used as the finishing plate shape database storage signal. When the finishing rolling is completed, the average value ΔW of the wedge shape data of three consecutive slabs is updated in real time. AVG Calculate the vertical roller center offset compensation value ΔC according to formula (2) V ;

[0103] During the correction process of vertical roller alignment, set the vertical roller center offset correction compensation value ΔC V The output upper limit is the preset maximum value of the vertical roller center deviation correction compensation value, the vertical roller center deviation correction compensation value ΔC V As the value increases, the rolling center line of the vertical roll shifts toward the operating side, the opening of the vertical roll on the operating side increases, and the opening of the vertical roll on the transmission side decreases.

[0104] The above technical solutions of the embodiments of the present invention are described in detail below with reference to specific application examples. For technical details not introduced during the implementation process, please refer to the relevant description above.

[0105] The purpose of the embodiment of the present invention is to address the problem of the rough rolling sickle bending following the slab incoming material and the plate shape change during the rolling process, to perform intermediate slab data sampling and calculation processing, and to adjust the rough rolling mill working roll gap deviation and vertical roll centering through program adaptive calculation, so as to improve the flatness of the rough rolling intermediate slab plate shape and the consistency of the front and rear blocks.

[0106] The solution of the embodiment of the present invention is: before conventional slabs are rolled into intermediate slabs, the slabs need to be heated to a certain target temperature by a heating furnace, and then taken out of the furnace and sent to the roughing mill through a steel feeding roller. The roughing mill performs 5 passes of reciprocating rolling with a step-by-step decreasing roll gap. The slabs are rolled from the front of the machine to the back of the machine by the roughing mill. The mill reverses in the 2nd and 4th passes, and the slabs are rolled from the back of the machine to the front of the machine by the roughing mill. The vertical rollers are located in front of the roughing mill and rotate. In the 1st, 3rd and 5th passes, an opening narrower than the slab width is performed to perform slab alignment and width control. Finally, after 5 passes of rolling, the slab with a thickness of 230 mm is thinned to an intermediate slab with a thickness of 40 mm, and the slab thickness and width are fixed to prepare for the downstream finishing rolling process. During the rough rolling process, camber is induced by a difference in thickness between the head and tail widths of the 40mm intermediate slab, or between the two sides of the slab's tail width, due to factors such as temperature differences between the head and tail, or alignment. One side has a lower temperature than the other. When the temperature reaches the critical point of deformation resistance, the slight temperature difference amplifies the difference in deformation resistance, resulting in one side being thinner and the other thicker, with the thinner side extending and bending toward the thicker side. The camber caused by the thickness difference during the thinning process is typically controlled by manually adjusting the horizontality of the roughing mill's working rolls, i.e., the roll gap deviation. However, manual intervention often overlooks the impact of vertical roll alignment. Therefore, a plate shape adaptive model is established to automatically compensate for this working roll gap deviation and model settings for vertical roll alignment. An embodiment of the present invention provides a rough rolling plate shape adaptive control method.

[0107] Before the start of a certain pass of slab rolling in rough rolling, the flatness adaptation model receives the temperature difference on both sides of the incoming material, including the difference between the pyrometers on both sides of the descaling box outlet or the temperature difference on both sides of the slab outlet side of the previous pass, the center line of the flatness at the previous pass outlet, and the rough and fine rolling flatness quality data. It calculates and executes the horizontal roll gap compensation value of the current rolling pass to control the flatness of the current pass outlet and the consistency of the continuous flatness. Taking the first pass of rough rolling as an example, the process is as follows:

[0108] (1) After the slab is unloaded, the current slab data tracking and flatness adaptation model calculation are started, and the flatness quality data is fed back from the rough rolling flatness and finishing rolling flatness databases to obtain the basic roll gap deviation feedback inheritance value GI;

[0109] (2) Read the HMI operation screen and manually set the pass roll gap deviation input value GHi;

[0110] (3) Determine that the pass number is equal to 1, complete the reading of the pyrometer difference on both sides of the descaling box outlet and the calculation of the temperature difference roller gap compensation data, and the output temperature difference roller gap compensation value GTi is calculated by formula (1); in formula (1), ΔT is the temperature difference on both sides of the slab; K is the weighting coefficient, which can be read from the table. It is 15 for conventional plates, about 13 for high-temperature mild steel for box plates, and about 18-20 for high-strength Mn steel; C is the constant calculated by the plate shape temperature difference model, which is mainly used to adjust the size of the output roller gap value. It is set to a negative number. The wider the slab, the smaller the C value is set, and the larger the output roller gap value is. Generally, for a slab with a width of 1300mm, the C value is -3.0, and for a slab with a width exceeding 1350mm, the C value is set to -2.7.

[0111] (4) When the pass number is determined to be 1, the center line acquisition and calculation of the previous pass is not performed, and the output center line roller gap compensation value GCi is 0.

[0112] (5) Before the first pass of biting steel, the roll gap deviation setting correction of the rough rolling R1 horizontal roll is completed according to formula (3). In formula (3), j1, j2, j3, and j4 are roll gap deviation factor coefficients in the process of roll gap deviation correction calculated by the model; in some embodiments, when the pass number is not greater than 1, j4 is set to 0, and when the pass number is greater than 1, j1, j2, j3, and j4 can be 0.3, 0.2, 0.2, and 0.3, respectively.

[0113] After the first rolling pass is completed, the pass judgment conditions in the model calculation and setting change, and the temperature difference roll gap compensation value GTi and the centerline roll gap compensation value GCi involved need to be changed. The temperature difference compensation value sampling data is read by the difference value of the pyrometer on the entrance side of each pass. The pyrometer is shone on the slab, 400mm away from the rolling center line. Except for the first pass, each rolling entrance is measured, that is, the temperature deviation temperature difference on both sides of the entrance. When the pass number i is greater than 1 and is not an odd number, the center line of the plate shape at the exit of the previous pass is received, and the centerline roll gap compensation value GCi is calculated and output. For example, the center line deviation (offset) value measured by the plate shape meter is taken. If the deviation value Li = 130mm, calculate Gci = K*Li, K can be taken as 0.005. When the deviation value Li is greater than 150mm, the Li value is taken as 150.

[0114] Similarly, the above roll gap deviation compensation setting calculation is completed and executed before the steel is bitten in the remaining rolling passes.

[0115] In the actual production process, the temperature difference on both sides of the slab affects the shape of the slab. The roughing roll gap deviation is used to adjust the shape of the intermediate slab, that is, the roughing outlet slab is straight. However, the temperature difference on both sides still exists objectively and affects the shape control of the downstream finishing process. Therefore, on the basis of controlling the straightness of the roughing intermediate slab, the vertical roll center deviation is compensated based on the continuous wedge hit of the finishing process to perform vertical roll alignment correction. The specific implementation of the plate shape adaptation of the vertical roll alignment correction is as follows:

[0116] The finishing roll change signal in the first-level control signal is used as the finishing plate shape database storage signal. When the finishing rolling is completed, the average value of the three consecutive wedge shapes ΔW is updated in real time. AVG , are stored, but only the wedge data of three steel blocks Z-2, Z-3, and Z-4 are taken to set the current block. After rolling a block, because Z-1 is in the finishing rolling, there is no wedge data. The wedge data read are WZ-2, WZ-3, and WZ-4. The vertical roller alignment correction model is started in the rough rolling steel coil NoZ, and the average value ΔWAVG of the three wedges of steel coil No. NZ-2, NZ-3, and NZ-4 is calculated. When ΔWAVG=(WZ-2+WZ-3+WZ-4) / 3 exceeds the target threshold, the output vertical roller center offset correction compensation value ΔC is calculated according to formula (2) V During the actual vertical roll alignment correction process, it is necessary to set an upper limit for the ΔCV output to prevent the vertical roll alignment from being overcorrected beyond the equipment's permitted state. As the ΔCV value increases, the vertical roll rolling centerline shifts toward the operating side, increasing the vertical roll opening on the operating side and decreasing the vertical roll opening on the transmission side.

[0117] The present embodiment has the following technical effects: During the operation of the flatness adaptive model, by reading the roughing and finishing flatness quality, including the centerline average and wedge average, the corresponding roll gap compensation calculation is initiated. This calculation combines flatness feedback inherited roll gap compensation, manually corrected roll gap compensation, temperature difference-based roll gap deviation, and centerline calculated roll gap deviation compensation to output the roughing pass roll gap deviation for flat roll shape control. Furthermore, if the finishing flatness quality continuously exceeds the limit and meets the conditions, the vertical roll centering roll gap compensation value is calculated and output, improving the finished product flatness quality through overall centerline adjustment. By implementing the flatness adaptive model, the accuracy and timeliness of roughing pass flatness adjustment are improved, reducing the amount of manual adjustment. The present embodiment combines model calculation with adaptive judgment and output technology, namely, model calculation control technology and data feedback judgment and control technology. The child worker receives the temperature difference between the two sides of the incoming material, including the difference between the pyrometer on the two sides of the descaling box outlet or the temperature difference between the two sides of the slab on the outlet side of the previous pass, the flatness centerline at the previous pass, and roughing and finishing pass flatness quality data, and calculates the horizontal roll gap compensation value for the current rolling pass. The vertical roll centering correction model is activated during rough rolling of coil number NZ. When the average value of the wedge shapes read for coil numbers NZ-2, NZ-3, and NZ-4 exceeds the target threshold, a vertical roll center offset compensation value is calculated and output. The present invention demonstrates that roll gap compensation and vertical roll centering compensation improve the shape of the intermediate bar and the wedge shape of the continuous finishing process. The model adaptively adjusts the shape of the roughing process, improving the accuracy of shape adjustments for each pass and reducing the operator's manual intervention in shape control. This improves the shape quality of the finished strip.

[0118] It should be understood that the specific order or hierarchy of steps in the disclosed processes is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the scope of the present disclosure. The accompanying method claims present elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy described.

[0119] In the foregoing detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that embodiments of the claimed subject matter require more features than are expressly recited in each claim. On the contrary, as reflected in the appended claims, the invention comprises less than all the features of any individual disclosed embodiment. The appended claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0120] The above description of the disclosed embodiments is intended to enable any person skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure is not limited to the embodiments presented herein but is intended to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0121] The above description includes examples of one or more embodiments. Of course, it is impossible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it will be appreciated by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to encompass all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, to the extent the term "comprising" is used in the specification or claims, the term is intended to be encompassed in a manner similar to the term "including". In addition, any use of the term "or" in the specification of the claims is intended to mean a "non-exclusive or".

[0122] Those skilled in the art will also appreciate that the various illustrative logical blocks, units, and steps listed in the embodiments of the present invention can be implemented by electronic hardware, computer software, or a combination of the two. To clearly demonstrate the interchangeability of hardware and software, the various illustrative components, units, and steps described above have generally described their functions. Whether such functions are implemented by hardware or software depends on the specific application and the design requirements of the entire system. Those skilled in the art may use various methods to implement the described functions for each specific application, but such implementation should not be understood as exceeding the scope of protection of the embodiments of the present invention.

[0123] The various illustrative logic blocks or units described in the embodiments of the present invention can be implemented or operated by a general-purpose processor, a digital signal processor, an application-specific integrated circuit (ASIC), a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof. The general-purpose processor can be a microprocessor, and optionally, the general-purpose processor can also be any conventional processor, controller, microcontroller or state machine. The processor can also be implemented by a combination of computing devices, such as a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors combined with a digital signal processor core, or any other similar configuration.

[0124] The steps of the methods or algorithms described in the embodiments of the present invention may be directly embedded in hardware, a software module executed by a processor, or a combination of the two. The software module may be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. For example, the storage medium may be connected to the processor so that the processor can read information from the storage medium and write information to the storage medium. Alternatively, the storage medium may also be integrated into the processor. The processor and storage medium may be provided in an ASIC, which may be provided in a user terminal. Alternatively, the processor and storage medium may also be provided in different components in the user terminal.

[0125] In one or more exemplary designs, the above-mentioned functions described in the embodiments of the present invention can be implemented in hardware, software, firmware, or any combination of the three. If implemented in software, these functions can be stored on a computer-readable medium or transmitted in the form of one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media and communication media that facilitate the transfer of computer programs from one location to another. Storage media can be any available medium that can be accessed by a general or special computer. For example, such computer-readable media can include but are not limited to RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store program code in the form of instructions or data structures and other forms that can be read by a general or special computer, or a general or special processor. In addition, any connection can be appropriately defined as a computer-readable medium. For example, if the software is transmitted from a website, server or other remote resource via a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless methods such as infrared, wireless, and microwave, it is also included in the definition of computer-readable media. The disks and discs mentioned above include compact disks, laser disks, optical disks, DVDs, floppy disks, and Blu-ray discs. Disks typically reproduce data magnetically, while discs typically reproduce data optically with lasers. Combinations of the above may also be included in computer-readable media.

[0126] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A rough rolling plate shape adaptive control method, characterized in that: Applicable to reversing roughing mills, including: Before the current slab enters the roughing mill for the first pass, the database is requested to send the wedge data of N historical slabs. The database returns M wedge data. Based on the M wedge data, the vertical roller center offset correction compensation value ΔC corresponding to the current slab is determined. V ; Wherein, the M wedge-shaped data correspond one by one to the most recent M continuous historical slabs rolled by the current finishing roll; M is less than or equal to N; Before the current slab enters the roughing mill for the first pass, the roughing roll gap deviation setting value of each pass of the previous slab in the roughing mill is obtained, and the basic roll gap deviation feedback inheritance value GI corresponding to the current slab is determined based on the obtained roughing roll gap deviation setting value of each pass; Obtain the manually set pass roll gap deviation input value GHi corresponding to each pass of the roughing mill; For each pass of the current slab in the roughing mill, the temperature difference between the two sides of the slab in the width direction before entering the rolling pass is obtained in real time, and the temperature difference roll gap compensation value GTi corresponding to the pass is determined based on the temperature difference between the two sides of the slab in the width direction before the rolling pass; At each odd-numbered pass of the roughing rolling of the current slab, the center line of the current slab is measured when the current slab exits the roughing mill; before the current slab enters each even-numbered pass of the roughing rolling, the center line roll gap compensation value GCi corresponding to the even-numbered pass is determined based on the slab center line measured at the previous odd-numbered pass; the center line roll gap compensation value GCi corresponding to the odd-numbered pass of the current slab in the roughing mill is set to 0; For each pass of the current slab in the roughing mill, the horizontal roll gap deviation setting correction value ΔG corresponding to the pass is determined according to the basic roll gap deviation feedback inheritance value GI, the manually set pass roll gap deviation input value GHi corresponding to the pass, the temperature difference roll gap compensation value GTi and the centerline roll gap compensation value GCi. i ; For each pass of the current slab in the roughing mill, the horizontal roll gap deviation corresponding to the pass is set to a correction value ΔG i , as the roll gap increase value of the operating side relative to the driving side of the horizontal roll of the roughing mill, the roll gap of the horizontal roll is set; For each odd-numbered pass of the current slab in the roughing mill, the set slab width corresponding to the odd-numbered pass and the vertical roll center offset correction compensation value ΔC are used. V , determine the respective opening degrees of the vertical roll on the operating side of the roughing mill and the vertical roll on the driving side, set the horizontal positions of the vertical roll on the operating side of the roughing mill and the vertical roll on the driving side according to the respective opening degrees of the vertical roll on the operating side of the roughing mill and the vertical roll on the driving side; for each even-numbered pass of the current slab in the roughing mill, set the horizontal positions of the vertical roll on the operating side of the roughing mill and the vertical roll on the driving side to the position with the largest opening degree.

2. The rough rolling plate shape adaptive control method according to claim 1, characterized in that: Determining a basic roll gap deviation feedback inheritance value GI corresponding to the current slab according to the obtained roughing roll gap deviation setting value of each pass, including: The average value of the roughing roll gap deviation setting values ​​corresponding to all the passes is used as the basic roll gap deviation feedback inheritance value GI corresponding to the current slab.

3. The rough rolling plate shape adaptive control method according to claim 1, characterized in that: For each pass of the current slab in the roughing mill, the temperature difference between both sides of the slab in the width direction before entering the rolling pass is obtained in real time, including: For the first pass of the current slab in the roughing mill, the difference between the pyrometers on both sides of the outlet of the descaling box after the furnace when the current slab is at the outlet of the descaling box after the furnace is obtained, which is used as the temperature difference on both sides of the slab in the width direction before entering the first pass of rolling. For other passes of the current slab in the roughing mill except the first pass, the difference between the pyrometers on both sides of the entrance of the roughing mill of the other passes is obtained when the current slab is at the entrance of the roughing mill of the other passes, which is used as the temperature difference on both sides of the slab in the width direction before entering the other pass of rolling.

4. The rough rolling plate shape adaptive control method according to claim 1, characterized in that: Determining the temperature difference between the two sides of the slab in the width direction before the pass is performed, and the temperature difference roll gap compensation value GTi corresponding to the pass is determined, including: Calculate the temperature difference roller gap compensation value GTi corresponding to the pass according to the following formula: Wherein, ΔT is the temperature difference on both sides of the slab width direction; K is the weighting coefficient; and C is the calculation constant of the plate shape temperature difference model.

5. The rough rolling plate shape adaptive control method according to claim 1, characterized in that: Before the current slab enters each even-numbered pass of rough rolling, the centerline roll gap compensation value GCi corresponding to the even-numbered pass is determined based on the slab centerline measured in the previous odd-numbered pass, including: Determining the deviation value of the slab centerline relative to the centerline of the shape meter as the centerline deviation value corresponding to the even-numbered passes; wherein the shape meter is arranged at the outlet side of the roughing mill for the odd-numbered passes; According to the material, width and thickness of the current slab, the preset deviation value weight table is checked to determine the deviation value weight corresponding to the even-numbered pass, and the deviation value weight corresponding to the even-numbered pass is multiplied by the corresponding center line deviation value to obtain the center line roller gap compensation value GCi corresponding to the pass.

6. The rough rolling plate shape adaptive control method according to claim 1, characterized in that: For each pass of the current slab in the roughing mill, the horizontal roll gap deviation setting correction value ΔG corresponding to the pass is determined according to the basic roll gap deviation feedback inheritance value GI, the manually set pass roll gap deviation input value GHi corresponding to the pass, the temperature difference roll gap compensation value GTi and the centerline roll gap compensation value GCi. i ,include: For each pass of the current slab in the roughing mill, the preset roll gap deviation factor coefficient table is checked according to the material, width and thickness of the current slab to determine the roll gap deviation factor coefficients corresponding to the basic roll gap deviation feedback inheritance value GI, the roll gap deviation input value GHi manually set for the pass, the temperature difference roll gap compensation value GTi and the center line roll gap compensation value GCi. Based on the corresponding roll gap deviation factor coefficients, the weighted sum of the basic roll gap deviation feedback inheritance value GI, the roll gap deviation input value GHi manually set for the pass, the temperature difference roll gap compensation value GTi and the center line roll gap compensation value GCi is calculated as the horizontal roll gap deviation setting correction value ΔG corresponding to the pass. i .

7. The rough rolling plate shape adaptive control method according to claim 1, characterized in that: According to the M wedge data, determine the vertical roller center offset correction compensation value ΔC corresponding to the current slab V ,include: When M=0, the vertical roller center offset compensation value ΔC corresponding to the current slab is corrected V Set to 0; When M is greater than 0, calculate the average value of the M wedge-shaped data and calculate the vertical roller center offset correction compensation value ΔC according to the following formula: V : Where ΔW AVG is the average value of the M wedge data; α is the fitting correction constant; W is the target wedge value.

8. The rough rolling plate shape adaptive control method according to claim 7, characterized in that: If the vertical roller center offset correction compensation value ΔC corresponding to the current slab V If the offset compensation value of the vertical roller center is greater than the preset maximum value, the vertical roller center offset compensation value ΔC corresponding to the current slab will be V Set to the preset maximum value of the roller center offset correction compensation value.

9. The rough rolling plate shape adaptive control method according to claim 1, characterized in that: For each odd-numbered pass of the current slab in the roughing mill, the set slab width corresponding to the odd-numbered pass and the vertical roll center offset correction compensation value ΔC are used. V , determine the respective opening degrees of the roughing mill operating side vertical roll and the transmission side vertical roll, and set the horizontal positions of the roughing mill operating side vertical roll and the transmission side vertical roll according to their respective opening degrees, including: Add half of the set plate width corresponding to the odd number of passes to the vertical roller center offset correction compensation value ΔC V The obtained value is used as the opening degree of the vertical roller on the operating side of the roughing mill, and the horizontal position of the vertical roller on the operating side of the roughing mill is set to the position specified by the opening degree of the vertical roller on the operating side of the roughing mill; Subtract the vertical roller center offset compensation value ΔC from half of the set plate width corresponding to the odd pass V The obtained value is used as the opening degree of the transmission side vertical roller of the roughing mill, and the horizontal position of the transmission side vertical roller of the roughing mill is set to the position specified by the opening degree of the transmission side vertical roller of the roughing mill.

10. The rough rolling plate shape adaptive control method according to claim 1, characterized in that: The method comprises: After the current slab is discharged from the furnace, the roughing roll gap deviation setting values ​​corresponding to all passes of the previous slab that has completed rough rolling in the roughing mill, which are recorded in the database, are obtained, and the average value of the roughing roll gap deviation setting values ​​corresponding to all the obtained passes is used as the basic roll gap deviation feedback inheritance value GI corresponding to the current slab; Read the HMI operation screen to manually set the pass roll gap deviation input value GHi; When the pass number is 1, the difference between the pyrometer values ​​on both sides of the descaling box outlet is used as the temperature difference on both sides of the slab width direction, and the temperature difference roller gap compensation value GTi of the current pass is calculated based on the temperature difference on both sides of the slab width direction: Wherein, ΔT is the temperature difference on both sides of the slab width direction; K is the weighting coefficient; C is the calculation constant of the plate shape temperature difference model; When the pass number is 1, the centerline roll gap compensation value GCi is set to 0; Before the first pass of biting steel, calculate the correction value of the horizontal roll gap deviation setting of the first pass: ΔG i＝1 =j1GI+j2GHi+j3GTi+j4GCi Among them, j1, j2, j3, and j4 are the roll gap deviation factor coefficients in the roll gap deviation correction process calculated by the model; After the first rolling pass is completed, for all subsequent passes, the temperature difference on both sides of the slab width direction corresponding to the pass is read by a pyrometer at the entrance side of each pass, and the temperature difference roll gap compensation value GTi of the pass is calculated based on the temperature difference on both sides of the slab width direction corresponding to the pass; When the pass number is even, obtain the plate shape centerline of the previous pass at the roughing mill outlet side, and calculate the centerline roll gap compensation value GCi corresponding to the pass number when the pass number is even based on the plate shape centerline of the previous pass at the roughing mill outlet side; the centerline roll gap compensation value GCi corresponding to the pass number when the pass number is odd is set to 0; Calculate the horizontal roll gap deviation setting correction value ΔG for each pass i : ΔG i =j1GI+j2GHi+j3GTi+j4GCi Among them, j1, j2, j3, and j4 are the roll gap deviation factor coefficients in the roll gap deviation correction process calculated by the model; For each pass of the current slab in the roughing mill, the horizontal roll gap deviation corresponding to the pass is set to a correction value ΔG i , as the roll gap increase value of the operating side relative to the driving side of the horizontal roll of the roughing mill, the roll gap of the horizontal roll is set; The finishing roll change signal in the first-level control signal is used as the finishing plate shape database storage signal. When the finishing rolling is completed, the average value ΔW of the wedge shape data of three consecutive slabs is updated in real time. AVG , calculate the vertical roller center offset correction compensation value ΔC V : Where ΔW AVG is the mean of the wedge data; α is the fitting correction constant; W is the target wedge value; During the correction process of vertical roller alignment, set the vertical roller center offset correction compensation value ΔC V The output upper limit is the preset maximum value of the vertical roller center deviation correction compensation value, the vertical roller center deviation correction compensation value ΔC V As the value increases, the rolling center line of the vertical roll shifts toward the operating side, the opening of the vertical roll on the operating side increases, and the opening of the vertical roll on the transmission side decreases.

Images