Rough rolling plate shape self-adaptive control method

Abstract

The embodiment of the invention provides a rough rolling plate shape self-adaptive control method which comprises the following steps: before a current plate blank enters a rough rolling mill for first-pass steel biting, according to wedge-shaped data and a rough rolling roll gap deviation set value which are recorded in a database before the current plate blank; determining a vertical roll center deviation correction compensation value and a basic roll gap deviation feedback inheritance value corresponding to the current plate blank; obtaining a manually set pass roll gap deviation input value corresponding to each pass of the roughing mill; the temperature difference of the two sides of the plate blank in the width direction before rolling of each pass is obtained, and the temperature difference roll gap compensation value corresponding to the pass is determined; determining a center line roll gap compensation value of each even number of passes according to the center line of the plate blank measured at the last odd number of passes of each even number of passes; determining the roll gap deviation setting correction value of the horizontal roll corresponding to the pass, setting the roll gap of the horizontal roll, and setting the positions of the operation side vertical roll and the transmission side vertical roll of the roughing mill according to the center deviation correction compensation value of the vertical roll corresponding to the pass.

Description

Technical Field

[0001] The 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 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 process.

[0003] In order to ensure smooth production and improve the hourly output of the rolling mill and the quality of the physical finished products, under the condition of limited plate shape capacity of the finishing mill, the rough rolling 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 change of plate shape during the rough rolling process. Therefore, a rough rolling shape adaptive control method is invented to improve the flatness of the intermediate billet shape and provide intermediate billets with stable plate shape for downstream processes, especially the finishing process, so as to improve the shape quality of the finished plate and strip.

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

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

[0007] To achieve the above-mentioned purpose, on the one hand, 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:

[0008] Before the current slab enters the first pass of the rough rolling mill, the database is requested to send the wedge data of N historical slabs, and the database returns M wedge data. According to the M wedge data, the vertical roll 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 M most recent continuous historical slabs rolled by the current finishing roller; 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 according to 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 rough rolling 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 according to 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 rough rolling of the current slab, the center line of the current slab when it leaves the rough rolling mill is measured; before the current slab enters each even-numbered pass of the rough rolling, the center line roll gap compensation value GCi corresponding to the even-numbered pass is determined according to the center line of the slab measured at the last odd-numbered pass; the center line roll gap compensation value GCi corresponding to the odd-numbered pass of the current slab in the rough rolling 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 center line 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 of the horizontal roll of the roughing mill relative to the driving side, the roll gap of the horizontal roll is set;

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

[0016] Further, according to the obtained rough rolling roll gap deviation setting value of each pass, the 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 taken 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 passes of rolling.

[0020] Further, according to the temperature difference on both 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] The temperature difference roll gap compensation value GTi corresponding to the pass is calculated according to the following formula:

[0022]

[0023] Among them, 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.

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

[0025] Determine the deviation value of the center line of the slab relative to the center line of the shape meter as the center line deviation value corresponding to the even-numbered passes; wherein the shape meter is arranged at the exit side of the roughing mill of 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 passes, and the deviation value weight corresponding to the even-numbered passes is multiplied by the corresponding center line deviation value to obtain the center line roll gap compensation value GCi corresponding to the pass.

[0027] Further, 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 center line 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 of the pass corresponding to the manually set pass, the temperature difference roll gap compensation value GTi and the center line roll gap compensation value GCi, and 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 of the pass corresponding to the manually set 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, the average value of the M wedge-shaped data is calculated, and the vertical roller center deviation correction compensation value ΔC is calculated 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 value is greater than the preset maximum value of the vertical roller center offset correction compensation value, the vertical roller center offset correction compensation value ΔC corresponding to the current slab is set. V Set to the preset maximum value of the roller center offset correction compensation value.

[0034] Further, for each odd-numbered pass of the current slab in the roughing mill, according to the set slab width corresponding to the odd-numbered pass and the vertical roll center offset correction compensation value ΔC 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 the respective opening degrees of the roughing mill operating side vertical roll and the transmission side vertical roll, 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 roughing mill operating side vertical roll, and the horizontal position of the roughing mill operating side vertical roll is set to the position specified by the opening degree of the roughing mill operating side vertical roll;

[0036] Subtract the vertical roller center offset compensation value ΔC from half of the set plate width corresponding to the odd-numbered passes V The obtained value is used as the opening degree of the vertical roller on the driving side of the roughing mill, and the horizontal position of the vertical roller on the driving side of the roughing mill is set to the position specified by the opening degree of the vertical roller on the driving 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 and recorded in the database are obtained, and the average value of the roughing roll gap deviation setting values ​​corresponding to all passes obtained 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 taken as the temperature difference on both sides of the slab width direction, and the temperature difference roll 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] Among them, 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 for 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 process of roll gap deviation correction calculated by the model;

[0046] After the first rolling pass is completed, for all the passes after the first rolling pass, 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 according to the temperature difference on both sides of the slab width direction corresponding to the pass;

[0047] When the pass number is an even number, the plate shape center line of the previous pass at the roughing mill outlet side is obtained, and the center line roll gap compensation value GCi corresponding to the pass number when the pass number is an even number is calculated according to the plate shape center line of the previous pass at the roughing mill outlet side; the center line roll gap compensation value GCi corresponding to the pass number when the pass number is an odd number 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 of the horizontal roll of the roughing mill relative to the driving side, the roll gap of the horizontal roll is set;

[0050] The finishing roll change signal in the primary 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 deviation compensation value ΔC by formula (2) V ;

[0051] During the correction process of vertical roller alignment, set the vertical roller center deviation 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 the rough rolling and finishing rolling plate quality data in the database, such as wedge data and rough rolling roll gap deviation setting value, roll gap compensation calculation is performed, and roll gap deviation is calculated by combining plate shape feedback inheritance roll gap compensation, manual correction roll gap compensation, temperature difference corresponding roll gap deviation, center line deviation value, etc., and the rough rolling pass roll gap deviation is output to control the flat roll plate shape; at the same time, the vertical roll centering roll gap compensation value is calculated and output, and the finished product plate shape quality is improved by adjusting the overall center line. Improve the plate shape adjustment accuracy and timeliness of each rough rolling pass, and reduce the amount of manual intervention adjustment. 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 drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

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

[0055] Figure 2 The figure is a schematic diagram of the positional relationship among the horizontal roller, the vertical roller, the pyrometer and the slab according to one embodiment of the present invention. DETAILED DESCRIPTION

[0056] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work 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 first pass of the roughing mill, request the database to send the wedge data of N historical slabs, and the database returns M wedge data. According to the M wedge data, the vertical roll 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 M most recent continuous historical slabs rolled by the current finishing roller; M is less than or equal to N;

[0059] Step S11, 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 according to 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 rough rolling 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 according to the temperature difference between the two sides of the slab in the width direction before the rolling pass;

[0062] Step S14, measuring the center line 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 center line roll gap compensation value GCi corresponding to the even-numbered pass according to the center line of the slab measured at the last odd-numbered pass before the current slab enters each even-numbered pass of the roughing rolling; 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;

[0063] Step S15, for each pass of the current slab in the roughing mill, 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 center line roll gap compensation value GCi, determine the horizontal roll gap deviation setting correction value ΔG corresponding to the pass i ;

[0064] Step S16, for each pass of the current slab in the roughing mill, a correction value ΔG is set for the horizontal roll gap deviation corresponding to the pass. i , as the roll gap increase value of the operating side of the horizontal roll of the roughing mill relative to the driving side, 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, according to the set slab width corresponding to the odd-numbered pass and the vertical roll center offset correction compensation value ΔC V , determine the respective opening degrees of the vertical roller on the operating side of the roughing mill and the vertical roller on the driving side, and set the horizontal positions of the vertical roller on the operating side of the roughing mill and the vertical roller on the driving side according to their respective opening degrees; for each even-numbered pass of the current slab in the roughing mill, set the horizontal positions of the vertical roller on the operating side of the roughing mill and the vertical roller 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 entrance side and exit side of the roughing mill in the embodiments need to be determined based on the roughing mill pass being executed. The entrance side of the roughing mill for each pass is the side where the slab of the pass enters the roughing mill, and the exit 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 cannot 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 last finishing mill roll, 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 most recent 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, and the vertical roller center offset correction compensation value ΔC corresponding to the current slab is determined based on the obtained wedge data of the most recent several slabs. 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, where 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 roll, so there is no wedge data of the most recent historical slab that has been finished by the current finishing roll in the database. 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 V Set to 0; when the second slab after the finishing roll change enters the roughing mill, the previous slab is being rolled in the finishing mill. At this time, there is no wedge data of the most recent historical slab that is rolled by the current finishing roll in the database. The number of wedge data of the historical slab actually obtained is 0. At this time, the vertical roll center offset correction compensation value ΔC corresponding to the second slab can be 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 matches the most recent 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 match the most recent 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 roll, and the database can return 3 wedge data, M is 3; and so on, when the number of wedge data in the database that matches the most recent historical slabs rolled by the current finishing roll 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 according to 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 of the plate shape multifunctional instrument at the outlet side of the last stand 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 previous piece of steel in the roughing area is rolled. 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 in the human-machine monitoring screen of the monitoring software can be read. Pyrometers are arranged 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 through the pyrometers. The flatness meter is only provided downstream of the roughing mill, i.e., at the exit side of the odd-numbered passes, so only the center line of the slab measured when the current slab exits the roughing mill in the previous odd-numbered pass can be obtained, and the center line of the slab is used before the even-numbered pass to determine the center line roll gap compensation value GCi corresponding to the even-numbered pass. Before the odd-numbered pass, since there is no corresponding slab center line on the exit side of the previous even-numbered pass, the center line 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 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 center line roll gap compensation value GCi. i , set the correction value ΔG of the horizontal roll gap deviation corresponding to the pass i , as the roll gap increase value of the operating side of the horizontal roll of the roughing mill relative to the transmission side, the roll gap of the horizontal roll is set; the roughing mill is only provided 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 embodiment of the present invention has the following technical effects: by reading rough rolling and finishing rolling plate quality data in the database, such as wedge shape data, roll gap compensation calculation is performed, and the roll gap deviation is calculated by combining plate shape feedback inheritance roll gap compensation, manual correction roll gap compensation, temperature difference corresponding roll gap deviation, center line deviation value, etc., and the rough rolling pass roll gap deviation is output to perform flat roll plate shape control; at the same time, the vertical roll centering roll gap compensation value is calculated and output, and the finished product plate shape quality is improved by adjusting the overall center line. The plate shape adjustment accuracy and timeliness of each rough rolling pass are improved, and the manual intervention adjustment amount is reduced.

[0068] Further, according to the obtained rough rolling roll gap deviation setting value of each pass, the 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 taken 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 in a certain period of time usually do not change significantly 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 in front of the current slab in each pass of the rough rolling mill 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, the horizontal roll gap deviation setting correction value ΔG corresponding to each pass is adjusted. i , further adjustments can be made on the basis of the relatively accurate basic roll gap deviation feedback inheritance value GI to improve the accuracy of the adjustment.

[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 passes of rolling.

[0073] In some embodiments, because the surface temperature of the slab decreases after leaving the descaling box outlet after the furnace for a period of time, the temperature difference on both sides of the slab width direction measured at the descaling box outlet after the furnace is more accurate than the temperature difference measured before the roughing mill entrance, so that the temperature difference roll gap compensation value of the first pass is calculated more accurately. For other passes, the temperature difference on both sides of the slab width direction is measured at the roughing mill entrance of the corresponding pass.

[0074] Further, according to the temperature difference on both 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 roll 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 a preset weighting coefficient table according to the slab material, thickness, and width. The weighting coefficient table can be determined by conducting tests on slabs of various materials, thicknesses, and widths in advance. 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 center line roll gap compensation value GCi corresponding to the even-numbered pass is determined according to the slab center line measured in the last odd-numbered pass, including:

[0078] Determine the deviation value of the center line of the slab relative to the center line of the shape meter as the center line deviation value corresponding to the even-numbered passes; wherein the shape meter is arranged at the exit side of the roughing mill of 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 passes, and the deviation value weight corresponding to the even-numbered passes is multiplied by the corresponding center line deviation value to obtain the center line roll gap compensation value GCi corresponding to the pass.

[0080] In some embodiments, a shape meter is provided at the outlet side of the rough rolling mill for odd-numbered passes, so that the shape meter can be used to measure the center line of the slab after the odd-numbered passes are rolled only when the odd-numbered passes are rolled. In the even-numbered passes, the center line of the slab measured in the last odd-numbered pass can be obtained, and the center line deviation value is obtained by subtracting the center line of the shape meter. Since the center line deviation value can only be obtained in the even-numbered passes, the corresponding center line roll gap compensation value GCi can only be obtained in the even-numbered passes, and the center line roll gap compensation value GCi corresponding to the odd-numbered passes is set to 0. The deviation value weight table can be determined in advance by testing slabs of different materials, widths, and thicknesses. The deviation weight is usually smaller for passes with smaller numbers and passes with larger numbers than for passes with middle numbers. For example, if a total of 5 passes are required, then for slabs of the same material, width, and thickness, the weights of passes 1 and 5 are smaller than that of passes 3. For example, the deviation weight of the first pass is 30%, the deviation weight of the third pass is 50%, and the deviation weight of the fifth pass is 20%. Because the slab is still relatively thick at the first pass, the small weight is due to the fact that the influence of the temperature difference on both sides of the slab has not been fully manifested through thinning, and a certain amount of adjustment is reserved for subsequent rolling. If the weight is large, the first pass is rolled too far, and the subsequent passes cannot be completely corrected; the slab has been thinned at the third pass, and a larger weight is conducive to adjusting the wedge; the shape of the slab at the fifth pass is basically stable, and a smaller weight is used to avoid excessive wedge adjustment, which will increase the thickness difference on both sides of the rolled intermediate slab and affect the downstream finishing process.

[0081] Further, 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 center line 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 of the pass corresponding to the manually set pass, the temperature difference roll gap compensation value GTi and the center line roll gap compensation value GCi, and 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 of the pass corresponding to the manually set 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 roll 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 determined in advance by testing for slabs of different materials, widths, and thicknesses. The roll gap deviation factor coefficients of the basic roll gap deviation feedback inheritance value GI, the pass corresponding to 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 smaller in the small and large pass numbers than in the middle pass number. 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 completely correct it; the slab has been thinned in the middle-numbered passes (such as the third pass), and the weight of the roll gap deviation factor coefficient is beneficial to adjust 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 downstream finishing rolling 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 deviation 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 the on-site debugging experience; W is the target wedge value, which is the 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 required final wedge hit is in the range of +30 microns to -30 microns, the absolute value of the target wedge is taken during the model calculation, and is calculated with the average value 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 Adjust the vertical rolls to significantly enhance the effect of flat rolls in controlling the wedge shape. The roll gap performs the roll gap deviation on both sides separately. The center of the vertical roll is then biased toward the side with a larger wedge shape, which can thin the side with a 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 roll center offset correction compensation value ΔC is used. V It is set to 0; it is also possible that only the wedge data of one nearest slab can be obtained, in which case 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, in which case 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 of the wedge data obtained is equal to the expected number of slabs N, in which case the average of the N wedge data is used directly.

[0087] Furthermore, if the vertical roller center offset correction compensation value ΔC corresponding to the current slab is V If the value is greater than the preset maximum value of the vertical roller center offset correction compensation value, the vertical roller center offset correction compensation value ΔC corresponding to the current slab is set. 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] Further, for each odd-numbered pass of the current slab in the roughing mill, according to the set slab width corresponding to the odd-numbered pass and the vertical roll center offset correction compensation value ΔC 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 the respective opening degrees of the roughing mill operating side vertical roll and the transmission side vertical roll, 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 roughing mill operating side vertical roll, and the horizontal position of the roughing mill operating side vertical roll is set to the position specified by the opening degree of the roughing mill operating side vertical roll;

[0091] Subtract the vertical roller center offset compensation value ΔC from half of the set plate width corresponding to the odd-numbered passes V The obtained value is used as the opening degree of the vertical roller on the driving side of the roughing mill, and the horizontal position of the vertical roller on the driving side of the roughing mill is set to the position specified by the opening degree of the vertical roller on the driving side 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 and recorded in the database are obtained, and the average value of the roughing roll gap deviation setting values ​​corresponding to all passes obtained 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 taken as the temperature difference on both sides of the slab width direction, and the temperature difference roll 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 setting of the first pass is calculated according to formula (3);

[0098] After the first rolling pass is completed, for all the passes after the first rolling pass, 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 according to the temperature difference on both sides of the slab width direction corresponding to the pass;

[0099] When the pass number is an even number, the plate shape center line of the previous pass at the roughing mill outlet side is obtained, and the center line roll gap compensation value GCi corresponding to the pass number when the pass number is an even number is calculated according to the plate shape center line of the previous pass at the roughing mill outlet side; the center line roll gap compensation value GCi corresponding to the pass number when the pass number is an odd number is set to 0;

[0100] According to formula (3), the correction value ΔG of the horizontal roll gap deviation setting 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 of the horizontal roll of the roughing mill relative to the driving side, the roll gap of the horizontal roll is set;

[0102] The finishing roll change signal in the primary 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 deviation 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 solution of the embodiment of the present invention is described in detail below in conjunction with specific application examples. For technical details not introduced during the implementation process, please refer to the relevant description in the previous text.

[0105] The purpose of the embodiment of the present invention is to sample and calculate the data of the intermediate billet in order to solve the problem that the sickle bend in rough rolling follows the incoming slab and the shape changes during the rolling process, and to adjust the roll gap deviation and the centering degree of the vertical roll of the rough rolling mill through program adaptive calculation, so as to improve the flatness of the plate shape of the intermediate billet in rough rolling and the consistency of the front and rear blocks.

[0106] The solution of the embodiment of the present invention is as follows: 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 a rough rolling mill through a steel feeding roller. The rough rolling mill performs 5 passes of reciprocating rolling with a step-by-step decreasing roll gap. The 1st, 3rd and 5th passes are rolled in forward rotation, and the slabs are rolled from the front of the machine to the back of the machine through the rough rolling mill. The 2nd and 4th passes of the rolling mill are reversed, and the slabs are rolled from the back of the machine to the front of the machine through the rough rolling mill. The vertical rollers are located in front of the rough rolling mill and rotate, and an opening narrower than the slab width is performed in the 1st, 3rd and 5th passes, and the slabs are aligned and the width is controlled. Finally, after 5 passes of rolling, the slab with a thickness of 230 mm is rolled into an intermediate slab with a thickness of 40 mm, and the slab thickness and width are fixed to prepare the slab for the downstream finishing process. During the rough rolling process, due to the temperature difference on both sides of the slab head, the temperature difference on both sides of the tail, or the alignment, the sickle bending phenomenon induced by the thickness difference on both sides of the head width direction or the tail width direction of the 40mm intermediate slab occurs. The temperature on one side is low and the temperature on the other side is high. When it is at the critical point of deformation resistance, the slight temperature difference causes the deformation resistance difference on both sides to be amplified, forming one side thin and the other side thick, and the thin side extends and bends toward the thick side. Usually, the thickness difference on both sides is controlled by manually adjusting the horizontality of the rough rolling mill working roll, that is, the roll gap deviation, to eliminate the sickle bending of the plate shape induced by the thickness difference on both sides in the thinning process, and manual intervention often ignores the influence of the alignment of the vertical roll. Therefore, for the automatic compensation of the working roll gap deviation and the vertical roll alignment model setting, a plate shape adaptive model is established, and an adaptive control method for rough rolling plate shape is provided in an embodiment of the present invention.

[0107] Before the rough rolling starts to bite the steel in a certain pass of slab rolling, the plate shape 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 after the furnace or the temperature difference on both sides of the slab on the outlet side of the previous pass of the rolling mill, the center line of the plate shape at the outlet of the previous pass, and the rough and fine rolling plate shape quality data, calculates and executes the horizontal roll gap compensation value of the current rolling pass, controls the straightness of the plate shape at the outlet of the current pass and the consistency of the continuous plate shape, and takes the first pass of rough rolling as an example, the process is as follows:

[0108] (1) After the slab is out of the furnace, the current slab data tracking and the plate shape adaptation model calculation are started, and the plate shape quality data is fed back from the rough rolling plate shape and the finishing rolling plate shape database 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) When the pass number is determined to be equal to 1, the pyrometer difference reading on both sides of the descaling box outlet and the temperature difference roll gap compensation data calculation are completed. The output temperature difference roll gap compensation value GTi is calculated by formula (1); where 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 for the plate shape temperature difference model calculation, which is mainly used to adjust the size of the output roll 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 roll gap value is. For a general slab with a width of 1300 mm, the C value is -3.0, and for a slab with a width of more than 1350 mm, the C value is set to -2.7.

[0111] (4) When the pass number is determined to be 1, the center line acquisition calculation of the previous pass is not performed, and the output center line roll 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), where 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 center line roll gap compensation value GCi involved need to be changed. The temperature difference compensation value sampling data is read through the difference of the pyrometer on the entrance side of each pass. The pyrometer is shone on the slab, and the distance from the rolling center line is 400mm. Except for the first pass, each rolling entrance is taken, that is, the temperature deviation temperature difference on both sides of the entrance. When the pass number i>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 center line roll gap compensation value GCi is calculated and output. For example, the center line deviation (departure) value measured by the plate shape meter is taken, such as the deviation value Li=130mm, and Gci=K*Li is calculated. 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 remaining rolling passes bite the steel.

[0115] In the actual production process, the temperature difference on both sides of the slab affects the shape of the slab, and the shape adjustment effect of the intermediate slab is achieved through the rough rolling roll gap deviation, that is, the rough rolling outlet shape is straight, but 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 rough rolling intermediate slab shape, the vertical roll center deviation is compensated based on the continuous wedge hit of the finishing rolling to correct the vertical roll alignment. The specific implementation of the shape adaptation of the vertical roll alignment correction is as follows:

[0116] The finishing roll change in the primary 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 used 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 roll alignment correction model is started in the rough rolling steel coil NoZ, and the three wedge average values ​​ΔWAVG of steel coils NZ-2, NZ-3, and NZ-4 are calculated. When ΔWAVG=(WZ-2+WZ-3+WZ-4) / 3 exceeds the target threshold, the output vertical roll center offset correction compensation value ΔC is calculated according to formula (2) V During the actual correction of vertical roll alignment, it is necessary to set the upper limit of ΔCV output to avoid the transition correction of vertical roll alignment beyond the allowed state of the equipment. As the ΔCV value increases, the vertical roll rolling center line shifts toward the operating side, the vertical roll opening on the operating side increases, and the vertical roll opening on the transmission side decreases.

[0117] The embodiment of the present invention has the following technical effects: during the operation of the plate shape adaptive model, by reading the rough rolling and finishing rolling plate shape quality including the center line average value and the wedge average value, the corresponding roll gap compensation calculation is started, combined with the plate shape feedback inheritance roll gap compensation, manual correction roll gap compensation, temperature difference corresponding roll gap deviation, center line calculation compensation roll gap deviation output rough rolling pass roll gap deviation to control the flat roll plate shape; at the same time, if the finishing rolling plate shape quality exceeds the limit continuously and meets the conditions, the vertical roll centering roll gap compensation value is calculated and output, and the finished product plate shape quality is improved by adjusting the overall center line. By using the plate shape adaptive model, the plate shape adjustment accuracy and timeliness of each rough rolling pass are improved, and the manual intervention adjustment amount is reduced. The embodiment of the present invention combines model calculation and adaptability judgment output technology, that is, model calculation control technology and data feedback judgment control technology. The temperature difference on both sides of the incoming material received by the child worker includes the difference between the pyrometers on both sides of the outlet of the descaling box after the furnace or the temperature difference on both sides of the slab on the outlet side of the previous pass rolling mill, the center line of the previous pass outlet plate shape, and the rough and finishing plate shape quality data, and calculates the horizontal roll gap compensation value of the current rolling pass. The vertical roller centering correction model is started in the rough rolling steel coil number NZ. When the average value of the three wedges of the steel coil numbers NZ-2, NZ-3, and NZ-4 read exceeds the target threshold, the vertical roller center offset correction compensation value is calculated and output. Through the embodiment of the present invention, the roll gap compensation correction and the vertical roller centering compensation correction have improved the intermediate billet shape and the finishing continuous production wedge shape. The rough rolling process uses a model to adaptively adjust the plate shape, improve the accuracy of the plate shape adjustment amount of each pass, and reduce the operator's manual intervention in the plate shape control. The actual plate shape quality of the finished strip is improved.

[0118] It should be understood that the specific order or hierarchy of steps in the disclosed process 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 protection of the present disclosure. The attached method claims present the 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 above 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 the embodiments of the claimed subject matter require more features than are clearly stated in each claim. On the contrary, as reflected in the appended claims, the invention is in a state of having less than all the features of the disclosed individual embodiments. Therefore, 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 disclosed embodiments are described above to enable any person skilled in the art to implement or use the present invention. Various modifications of these embodiments are obvious to those skilled in the art, and the general principles defined herein may also 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 given herein, but is consistent with the broadest scope of the principles and novel features disclosed in this application.

[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 should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including". In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

[0122] Those skilled in the art may also understand that the various illustrative logical blocks, units, and steps listed in the embodiments of the present invention may be implemented by electronic hardware, computer software, or a combination of the two. In order 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, a discrete gate or transistor logic, a discrete hardware component, or any combination of the above. 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 method or algorithm described in the embodiments of the present invention can be directly embedded in hardware, a software module executed by a processor, or a combination of the two. The software module can be stored in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a removable disk, a CD-ROM, or other storage media of any form in the art. Exemplarily, the storage medium can be connected to the processor so that the processor can read information from the storage medium and can write information to the storage medium. Optionally, the storage medium can also be integrated into the processor. The processor and the storage medium can be arranged in an ASIC, and the ASIC can be arranged in a user terminal. Optionally, the processor and the storage medium can also be arranged in different components in the user terminal.

[0125] In one or more exemplary designs, the above 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 place to another. The storage medium can be any available medium that can be accessed by any 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, disk storage or other magnetic storage devices, or any other medium that can be used to carry or store program codes in the form of instructions or data structures and other forms that can be read by general or special computers, or general or special processors. In addition, any connection can be appropriately defined as a computer-readable medium, for example, if the software is transmitted from a website site, server or other remote resource through a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wirelessly, such as infrared, wireless and microwave, it is also included in the defined computer-readable medium. The disk and disc include compact disk, laser disk, optical disk, DVD, floppy disk and blue-ray disk. Disks usually copy data magnetically, while discs usually copy data optically with lasers. The above combination can 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 first pass of the rough rolling mill, the database is requested to send the wedge data of N historical slabs, and the database returns M wedge data. According to the M wedge data, the vertical roll 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 M most recent continuous historical slabs rolled by the current finishing roller; 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 according to 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 rough rolling 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 according to 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 rough rolling of the current slab, the center line of the current slab when it leaves the rough rolling mill is measured; before the current slab enters each even-numbered pass of the rough rolling, the center line roll gap compensation value GCi corresponding to the even-numbered pass is determined according to the center line of the slab measured at the last odd-numbered pass; the center line roll gap compensation value GCi corresponding to the odd-numbered pass of the current slab in the rough rolling 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 center line 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 of the horizontal roll of the roughing mill relative to the driving side, the roll gap of the horizontal roll is set; For each odd-numbered pass of the current slab in the roughing mill, according to the set slab width corresponding to the odd-numbered pass and the vertical roll center offset correction compensation value ΔC V , determine the respective opening degrees of the vertical roller on the operating side of the roughing mill and the vertical roller on the driving side, and set the horizontal positions of the vertical roller on the operating side of the roughing mill and the vertical roller on the driving side according to their respective opening degrees; for each even-numbered pass of the current slab in the roughing mill, set the horizontal positions of the vertical roller on the operating side of the roughing mill and the vertical roller 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: According to the obtained rough rolling roll gap deviation setting value of each pass, the basic roll gap deviation feedback inheritance value GI corresponding to the current slab is determined, including: The average value of the roughing roll gap deviation setting values ​​corresponding to all the passes is taken 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 rough rolling mill, the temperature difference on 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 passes of rolling.

4. The rough rolling plate shape adaptive control method according to claim 1, characterized in that: 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: The temperature difference roll gap compensation value GTi corresponding to the pass is calculated according to the following formula: Among them, 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.

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 center line roll gap compensation value GCi corresponding to the even-numbered pass is determined according to the slab center line measured in the last odd-numbered pass, including: Determine the deviation value of the center line of the slab relative to the center line of the shape meter as the center line deviation value corresponding to the even-numbered passes; wherein the shape meter is arranged at the exit side of the roughing mill of 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 passes, and the deviation value weight corresponding to the even-numbered passes is multiplied by the corresponding center line deviation value to obtain the center line roll 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 center line 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 of the pass corresponding to the manually set pass, the temperature difference roll gap compensation value GTi and the center line roll gap compensation value GCi, and 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 of the pass corresponding to the manually set 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, 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 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 value is greater than the preset maximum value of the vertical roller center offset correction compensation value, the vertical roller center offset correction compensation value ΔC corresponding to the current slab is set. 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, according to the set slab width corresponding to the odd-numbered pass and the vertical roll center offset correction compensation value ΔC 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 the respective opening degrees of the roughing mill operating side vertical roll and the transmission side vertical roll, 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 roughing mill operating side vertical roll, and the horizontal position of the roughing mill operating side vertical roll is set to the position specified by the opening degree of the roughing mill operating side vertical roll; Subtract the vertical roller center offset compensation value ΔC from half of the set plate width corresponding to the odd-numbered passes V The obtained value is used as the opening degree of the vertical roller on the driving side of the roughing mill, and the horizontal position of the vertical roller on the driving side of the roughing mill is set to the position specified by the opening degree of the vertical roller on the driving side 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 and recorded in the database are obtained, and the average value of the roughing roll gap deviation setting values ​​corresponding to all passes obtained 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 pyrometers on both sides of the descaling box outlet after the furnace is taken as the temperature difference on both sides of the slab width direction, and the temperature difference roll gap compensation value GTi of the current pass is calculated according to the temperature difference on both sides of the slab width direction: Among them, 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 for 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 process of roll gap deviation correction calculated by the model; After the first rolling pass is completed, for all the passes after the first rolling pass, 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 according to the temperature difference on both sides of the slab width direction corresponding to the pass; When the pass number is an even number, the plate shape center line of the previous pass at the roughing mill outlet side is obtained, and the center line roll gap compensation value GCi corresponding to the pass number when the pass number is an even number is calculated according to the plate shape center line of the previous pass at the roughing mill outlet side; the center line roll gap compensation value GCi corresponding to the pass number when the pass number is an odd number 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 process of roll gap deviation correction 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 of the horizontal roll of the roughing mill relative to the driving side, the roll gap of the horizontal roll is set; The finishing roll change signal in the primary 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 deviation correction compensation value ΔC V : Where, ΔW AVG is the mean of 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 deviation 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.

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