CN116274412A - Roll gap control method and device for finish rolling vertical roll - Google Patents
Roll gap control method and device for finish rolling vertical roll Download PDFInfo
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- CN116274412A CN116274412A CN202310220053.3A CN202310220053A CN116274412A CN 116274412 A CN116274412 A CN 116274412A CN 202310220053 A CN202310220053 A CN 202310220053A CN 116274412 A CN116274412 A CN 116274412A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/04—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The invention discloses a roll gap control method and a device for a finish rolling vertical roll, wherein the control method is characterized in that the width of a billet head of an intermediate billet is obtained, and the preset roll gap for centering control is carried out on the middle position of the intermediate billet by the finish rolling vertical roll, when the width of the billet head is larger than the lower limit value of the roll gap of the intermediate billet passing through the finish rolling vertical roll, the billet head position is indicated to be blocked on the finish rolling vertical roll, the billet head width is input into a preset calculation model, the offset compensation amount of the finish rolling vertical roll is obtained, the roll gap of the finish rolling vertical roll is adjusted to the target roll gap according to the offset compensation amount, the billet head position of the intermediate billet is pulled to smoothly bite into the finish rolling vertical roll through the finish rolling vertical roll, after the billet head position is determined to pass through the finish rolling vertical roll, the target roll gap is controlled to be reduced to the preset roll gap by the control strategy, the overall control strategy can smoothly carry out on the ultra-wide intermediate billet, centering control on the finish rolling vertical roll is ensured, and the reliability of the control on the intermediate billet is further improved.
Description
Technical Field
The application relates to the technical field of finish rolling vertical roll control, in particular to a roll gap control method and device of a finish rolling vertical roll.
Background
On a hot rolling production line, an intermediate billet is required to be rolled firstly and then conveyed to a finishing mill group for rolling a strip steel finished product, and a finishing mill vertical roll is arranged at the inlet of the finishing mill group and used for controlling the centering position of the intermediate billet. Due to the limitation of the rolling process, the rolling intermediate billet often has the phenomenon of ultra-wide head and ultra-wide tail, and when the ultra-wide quantity is excessive, the clamping is easy to occur at the position of the finish rolling vertical roll, the biting failure of the finish rolling vertical roll occurs, and the fault of the hot continuous rolling production line is caused.
Therefore, how to improve the reliability of the finish rolling vertical roll control is a technical problem to be solved at present.
Disclosure of Invention
According to the roll gap control method and device for the finish rolling vertical roll, the reliability of control of the finish rolling vertical roll is improved.
The embodiment of the invention provides the following scheme:
in a first aspect, an embodiment of the present invention provides a roll gap control method for a finish rolling vertical roll, where the method includes:
obtaining the width of a billet head of an intermediate billet and a preset roll gap of a finish rolling vertical roll, wherein the preset roll gap is a roll gap value of the finish rolling vertical roll for centering control on the middle position of the intermediate billet;
when the width of the billet head is larger than the lower limit value of the roll gap, inputting the width of the billet head into a preset calculation model to obtain the offset compensation quantity of the finish rolling vertical roll, wherein the lower limit value of the roll gap is the minimum roll gap of the intermediate billet passing through the finish rolling vertical roll;
adjusting the roll gap of the finish rolling vertical roll to a target roll gap according to the offset compensation quantity, and pulling the billet head position of the intermediate billet to pass through the finish rolling vertical roll;
and after the billet head position is determined to pass through the finish rolling vertical roll, controlling the finish rolling vertical roll to be reduced from the target roll gap to the preset roll gap so as to perform finish rolling centering control on the middle position.
In an alternative embodiment, the obtaining the blank width of the intermediate blank includes:
acquiring rolling pass and width measurement data of the intermediate billet;
and when the rolling pass is an end pass, determining the maximum value in the width measurement data as the billet head width.
In an alternative embodiment, said determining the maximum value of said width measurement data as said billet width comprises:
acquiring rolling process information of the intermediate billet;
determining whether to curl the intermediate blank using a coil box according to the rolling process information;
if not, determining a target data set in the width measurement data according to a preset initial measurement period when the roll load signal of the last pass is received, and determining the maximum value of the target data set as the width of the billet;
if yes, comparing the current width measurement data with the width measurement data of the previous period when the roll unloading signal of the last pass is received, stopping until a preset ending measurement period is reached, and determining the maximum value in the comparison result as the width of the billet head.
In an alternative embodiment, the inputting the billet width into a preset calculation model to obtain the offset compensation amount of the finish rolling vertical roll includes:
when the intermediate blank is not passedWhen the plate coil box is conveyed to the finish rolling vertical roller, the plate coil box is conveyed to the finish rolling vertical roller according to the formula
Obtaining the offset compensation quantity K, wherein B is the width of the blank head, and M is the lower limit value of the roll gap for conveying the intermediate blank through the plate coil box;
when the intermediate billet is conveyed to the finish rolling vertical roller through the plate rolling box, the offset compensation quantity K is obtained according to a formula K=B-N, wherein B is the billet head width, and N is the lower limit value of the roll gap of the intermediate billet which is not conveyed through the plate rolling box.
In an alternative embodiment, when the intermediate billet is not conveyed to the finish rolling vertical roll through a plate coil box, the lower limit value M of the roll gap is set to be M=15 mm, and the offset compensation amount K is set to be 0 < K.ltoreq.20 mm;
when the intermediate billet is conveyed to the finish rolling vertical roll through a plate coil box and the billet head width is not more than a width threshold value, setting the offset compensation quantity N to be N=7mm;
and when the intermediate billet is conveyed to the finish rolling vertical roll through a plate winding box and the billet head width is larger than the width threshold, setting the roll gap lower limit value N to be N=10 mm, and setting the offset compensation amount K to be 7 < K < 30mm.
In an alternative embodiment, determining the position of the billet head through the finishing vertical roll comprises:
when the hot rolling production line is in a target state, obtaining the rolling force of the finish rolling vertical roller, wherein the target state is that a front feeding roller of the finish rolling vertical roller is in a loaded state, and a rear finishing roller is in a non-loaded state;
if the rolling force is larger than the pressure threshold value and the duration is in a preset duration interval, determining that the billet head position passes through the finish rolling vertical roller.
In an alternative embodiment, the controlling the finishing vertical roll to decrease from the target roll gap to the preset roll gap includes:
obtaining a roller distance and a traction speed of the intermediate billet, wherein the roller distance is the interval distance between the finish rolling vertical roller and a rear finishing roller;
obtaining a lower speed limit for adjusting the roll gap according to the roll spacing and the traction speed;
and outputting a driving instruction of a target speed according to the lower speed limit so as to reduce the target roll gap to the preset roll gap, wherein the target speed is a roll gap adjusting speed which is larger than the lower speed limit.
In a second aspect, an embodiment of the present invention further provides a roll gap control device for a finishing vertical roll, where the device includes:
the device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the width of a billet head of an intermediate billet and a preset roll gap of a finish rolling vertical roll, wherein the preset roll gap is a roll gap value of the finish rolling vertical roll for centering control on the middle position of the intermediate billet;
the obtaining module is used for inputting the width of the billet into a preset calculation model when the width of the billet is larger than the lower limit value of the roll gap, so as to obtain the offset compensation quantity of the finish rolling vertical roll, wherein the lower limit value of the roll gap is the minimum roll gap of the intermediate billet passing through the finish rolling vertical roll;
the adjusting and pulling module is used for adjusting the roll gap of the finish rolling vertical roll to a target roll gap according to the offset compensation quantity and pulling the blank head position of the intermediate blank to pass through the finish rolling vertical roll;
and the control module is used for controlling the finish rolling vertical roller to be reduced from the target roll gap to the preset roll gap after the billet head position is determined to pass through the finish rolling vertical roller, so as to perform finish rolling centering control on the middle position.
In a third aspect, embodiments of the present invention also provide an electronic device comprising a processor and a memory coupled to the processor, the memory storing instructions that, when executed by the processor, cause the electronic device to perform the steps of the method of any one of the first aspects.
In a fourth aspect, embodiments of the present invention also provide a computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, implements the steps of the method according to any of the first aspects.
Compared with the prior art, the roll gap control method and device for the finish rolling vertical roll have the following advantages:
according to the invention, the gap control is realized by obtaining the width of the blank head of the intermediate blank and the preset gap for the finish rolling vertical roller to perform centering control on the middle position of the intermediate blank, when the width of the blank head is larger than the lower limit value of the gap of the intermediate blank passing through the finish rolling vertical roller, the blank head position is possibly blocked on the finish rolling vertical roller, if the intermediate blank fails to bite into the finish rolling vertical roller, the blank head width is input into a preset calculation model to obtain the offset compensation amount of the finish rolling vertical roller, the gap of the finish rolling vertical roller is adjusted to the target gap according to the offset compensation amount, the blank head position of the intermediate blank is pulled to pass through the finish rolling vertical roller, the blank head position is smoothly bitten into the finish rolling vertical roller, the finish rolling vertical roller is controlled to be reduced to the preset gap from the target gap after the blank head position is determined to perform finish rolling centering control on the middle position, and the overall control strategy can enable the ultra-wide intermediate blank to smoothly perform centering control on the intermediate blank, and the centering control on the intermediate blank is ensured, and the reliability of the finish rolling vertical roller control is improved.
Drawings
In order to more clearly illustrate the embodiments of the present description or the technical solutions in the prior art, the drawings that are required for the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present description, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a roll gap control method for a finish rolling vertical roll according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a roll gap control device for a finish rolling vertical roll according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the embodiments of the present invention.
On a hot rolling production line, an intermediate billet rolling unit, a fine descaling device and a finishing mill unit are sequentially arranged, after the intermediate billet rolling unit finishes rolling the intermediate billet, the fine descaling device removes an oxide layer on the surface of the intermediate billet and then conveys the intermediate billet to the finishing mill unit for finish rolling, a finish rolling vertical roller is arranged between the fine descaling device and a finish rolling roller, and the finish rolling vertical roller is vertically arranged and is used for centering and controlling the intermediate billet and preventing the intermediate billet from moving in the width direction of the intermediate billet; the finish rolling rolls are horizontally arranged to finish-roll the intermediate blanks. Because the end part of the intermediate billet is free from material to restrict the width, the width of the billet head is over-limited after the intermediate billet is rolled, and the blockage is easy to occur at the finish rolling vertical roll, so that the control reliability of the finish rolling vertical roll is insufficient.
Referring to fig. 1, fig. 1 is a flowchart of a roll gap control method of a finish rolling vertical roll according to an embodiment of the present invention, where the method includes:
s11, acquiring the width of a billet head of the intermediate billet and a preset roll gap of a finish rolling vertical roll, wherein the preset roll gap is a roll gap value of the finish rolling vertical roll for centering control on the middle position of the intermediate billet.
Specifically, the width of the billet head is the width of the end part of the middle billet entering one end of the finish rolling vertical roll. When the intermediate billet is subjected to finish rolling, the intermediate billet is restrained by conditions such as steel types, rolling widths and the like, part of the intermediate billet is required to be coiled by a coil box and then uncoiled for head-to-tail position adjustment, the traction direction of the intermediate billet after rolling is adopted as the positive direction, the width of one end of the intermediate billet in the positive direction is the head width, the width of one end of the intermediate billet in the negative direction is the tail width, and if the intermediate billet is not coiled by the coil box, the billet head width is the head width; if the coil box is adopted to curl the middle blank to replace the direction, the width of the blank head is the width of the tail, and the width of the blank head can be obtained by on-line measurement of a width gauge arranged on a hot rolling production line. Because the finish rolling vertical roll is used for centering control of the intermediate billet, in order to ensure the accuracy of control, the intermediate billet needs to have interference when entering the finish rolling vertical roll, so that the corresponding relationship exists between the middle position of the intermediate billet and the set roll gap value, and the preset roll gap can be obtained based on the corresponding relationship.
In a specific embodiment, obtaining the toe width of the intermediate billet comprises:
obtaining rolling pass and width measurement data of an intermediate billet; when the rolling pass is the last pass, the maximum value in the width measurement data is determined as the billet width.
Specifically, the rolling pass represents the rolling quantity of the intermediate blank based on the rough rolling process, if the rolling pass is the last pass, the intermediate blank is obtained after the last pass is performed on the billet, the width of the intermediate blank is measured, so that width measurement data are obtained, and the maximum value in the width measurement data is determined to be the width of the billet head. It can be understood that when the width measurement is implemented, the width gauge is disposed at the outlet of the intermediate billet rolling mill set, the width gauge measures the intermediate billet based on a preset scanning period, judges the validity of the measured data, and stores the measured time and the measured width value correspondingly to obtain the width measured data when the measured data is determined to be correct, the width measured data can be input into a preset extremum function, the maximum value is calculated through the extremum function, and the maximum value is determined to be the billet width.
In practical application, the length of the intermediate blank can reach 50-70m, so that the data size of the width measurement data is large, if the maximum value is calculated by adopting the extremum function, calculation redundancy exists, more calculation time is consumed, and corresponding control of the finish rolling vertical roller cannot be responded in time. Based on this, in a specific embodiment, determining the maximum value in the width measurement data as the billet width includes:
obtaining rolling process information of an intermediate billet; determining whether to use the coiled plate box to curl the intermediate blank according to the rolling process information; if not, determining a target data set in the width measurement data according to a preset initial measurement period when receiving a roll load signal of the last pass, and determining the maximum value of the target data set as the width of the billet; if yes, when a roll unloading signal of the last pass is received, comparing the current width measurement data with the width measurement data of the last period until a preset final measurement period is reached, and determining the maximum value in the comparison result as the width of the billet head.
Specifically, the rolling process information can be steel grade, strip steel thickness, remark information and the like of the intermediate blank, so that whether the intermediate blank needs to be curled by a plate coil box or not can be determined, for example, when the yield strength of the steel grade is overlarge and the thickness of a finished strip steel is lower, the intermediate blank needs to be coiled and uncoiled. When it is determined that the intermediate blank is not rolled by the plate coil box, if a roll load signal of an end pass is received, which indicates that the end pass rolling of the intermediate blank is started, a target data set is determined in width measurement data based on a start measurement period, wherein the start measurement period represents a period of time that the head position of the intermediate blank passes through a width gauge after the end pass rolling is started, the period of time can be set to be 5s, namely, 5s from the initial rolling time to the rolling forward, the width data measured in the period of time can be collected to the target data set, and the maximum value of the target data set is determined to be the width of the blank head. Similarly, when the intermediate blank needs to be curled by using the plate winding box, if a roll unloading signal of the last pass is received, which indicates that the intermediate blank has completed rolling of the last pass, comparing the current width measurement data with the width measurement data of the last period, and storing larger values in the current width measurement data and the width measurement data of the last period all the time, stopping comparing calculation when a final measurement period indicates that the intermediate blank completely passes through the measurement position of the width measuring instrument, determining the maximum value stored currently as the width of the blank head, and setting the final measurement period to be 0.3s after the width value is not measured. And (3) obtaining the blank head width of the intermediate blank and the preset roll gap of the finish rolling vertical roll, and then entering step S12.
And S12, inputting the width of the billet into a preset calculation model when the width of the billet is larger than the lower limit value of the roll gap, and obtaining the offset compensation quantity of the finish rolling vertical roll, wherein the lower limit value of the roll gap is the minimum roll gap of the intermediate billet passing through the finish rolling vertical roll.
Specifically, if the width of the billet head is not greater than the lower limit value of the roll gap, the intermediate billet can normally pass through the finish rolling vertical roll, and the intermediate billet is controlled to be conveyed to the finish rolling vertical roll so as to perform centering control and finish rolling; otherwise, if the width of the billet head is larger than the lower limit value of the roll gap, which indicates that the intermediate billet possibly has blocking when passing through the finish rolling vertical roll, the width of the billet head is input into a calculation model so as to calculate the offset compensation quantity. The offset compensation quantity characterizes the increase of the roll gap of the finish rolling vertical roll based on the roll gap lower limit value when the width of the billet head is larger than the roll gap lower limit value. The calculation model may be a comparison table, the offset compensation amount is determined in the comparison table based on the increment that the width of the billet is greater than the lower limit value of the roll gap, and the corresponding relationship between the increment and the offset compensation amount in the comparison table may be determined based on experience of a technician or based on calibration test, which is not described herein.
In practical applications, due to the limitation of the hot rolling process, the intermediate billet may need to be coiled through a coil box, and the traction force generated by using the coil box and not using the coil box is different, so that the accuracy of calculating the offset compensation amount is insufficient if the differential control is not performed. In a specific embodiment, the intermediate billet is transported to the finishing vertical roll without passing through the plate package, the traction force of the intermediate billet is relatively large, the intermediate billet can pass through the finishing vertical roll with a larger acceleration, and the set offset compensation amount can be relatively small, so that the formula can be used
And obtaining an offset compensation quantity K, wherein B is the width of the blank head, M is the lower limit value of the roll gap of the intermediate blank conveyed through the plate coil box, the offset compensation quantity calculated according to the formula is 1/2 of the width increment, and the width increment is the difference value between the width of the blank head and the lower limit value of the roll gap. The lower limit value of the roll gap when the intermediate blank is conveyed through the plate winding box can be set according to actual scenes, for example, the lower limit value M of the roll gap is set to be 15mm, when the width increment is not more than 15mm, the offset compensation amount is not calculated, and the intermediate blank is directly pulled to pass through the finish rolling vertical roll; when the width increment is larger than 15mm, the offset compensation amount is calculated according to the formula, namely, after the width increment is larger than 15mm, the width of each width exceeds 1mm, the roll gap of the finish rolling vertical roll is increased by 0.5mm from the lower limit value of the roll gap, and the offset compensation amount K is set to be more than 0 and less than or equal to 20mm due to the structural limitation of the finish rolling vertical roll.
Similarly, when the intermediate billet is conveyed to the finish rolling vertical roller through the plate winding box, the traction force of the intermediate billet is relatively small, and the set offset compensation amount can be relatively large, so that the offset compensation amount K is obtained according to a formula K=B-N, wherein B is the billet head width, and N is the lower limit value of the roll gap of the intermediate billet which is not conveyed through the plate winding box. Because the intermediate billet temperature is higher in the hot rolling process, the function of the finish rolling vertical roll is to ensure that the intermediate billet is positioned in the middle position of the finish rolling roll, and if indiscriminate compensation is carried out according to the formula, the metal hot fluidity will cause poor centering control result. Based on this, in a specific embodiment, when the intermediate billet is transported to the finish rolling vertical roll through the coil box and the billet head width is not greater than the width threshold value, it is described that the offset compensation amount is set to 7mm without setting the offset compensation amount to be too large; when the intermediate billet is conveyed to a finish rolling vertical roll through a plate rolling box, and the billet head width is larger than a width threshold, setting the roll gap lower limit value N to be 10mm, calculating an offset compensation amount according to a formula K=B-N, and setting the offset compensation amount K to be 7 < K and less than or equal to 30mm. The width threshold value can be determined according to the specification and steel grade of the intermediate billet, for example, the offset compensation amount is set to be 7mm when the width increment is smaller than 17 mm; when the width is not less than 17mm, the width is more than 1mm, and the roll gap of the finish rolling vertical roll is increased by 1mm from the lower limit value of the roll gap. After the offset compensation amount of the finish rolling vertical roll is obtained, the process proceeds to step S13.
And S13, adjusting the roll gap of the finish rolling vertical roll to a target roll gap according to the offset compensation quantity, and pulling the billet head position of the intermediate billet to pass through the finish rolling vertical roll.
Specifically, the target roll gap is the sum of the preset roll gap and the offset compensation amount, which characterizes that the billet head position normally passes through the roll gap value of the finish rolling vertical roll, when the roll gap of the finish rolling vertical roll is adjusted, a corresponding adjustment instruction can be output to adjust the current roll gap of the finish rolling vertical roll to the target roll gap, so that the billet head position can smoothly pass through the finish rolling vertical roll, and the billet head position enters the step S14 after passing through the finish rolling vertical roll.
And S14, after the billet head position is determined to pass through the finish rolling vertical roll, controlling the finish rolling vertical roll to be reduced from the target roll gap to the preset roll gap so as to perform finish rolling centering control on the middle position.
Specifically, the position of the billet head can be determined based on the loading time of the finish rolling vertical roll through the finish rolling vertical roll, for example, when the finish rolling vertical roll reaches the preset time, the position of the billet head passes through the finish rolling vertical roll, after the billet head passes through the finish rolling vertical roll, the finish rolling vertical roll indicates that the intermediate billet is 'snapped', in order to ensure the centering action of the finish rolling vertical roll, the roll gap of the vertical roll cannot be increased by a larger offset in the whole course, the finish rolling vertical roll needs to be reduced from a target roll gap to a preset roll gap before the finish rolling roll is snapped, the centering position is controlled in the finish rolling, and the intermediate billet is prevented from moving in the width direction during the finish rolling, so that the finish rolling quality of strip steel is ensured.
In practical application, since the shape of the billet in the width direction is not regular, erroneous judgment may occur if only the length of the loading time of the finish rolling vertical rolls is used as a judgment flag. Based on this, in one specific embodiment, determining the position of the billet head through the finishing vertical rolls comprises:
when the hot rolling production line is in a target state, obtaining the rolling force of the finish rolling vertical roller, wherein the target state is that a front feeding roller of the finish rolling vertical roller is in a loaded state, and a rear finishing roller is in a non-loaded state; if the rolling force is larger than the pressure threshold value and the duration time is in a preset duration time interval, determining that the billet head passes through the finish rolling vertical roll.
Specifically, the front feeding roller is an inlet pinch roller of the fine descaling device and is positioned at one side of the fine rolling vertical roller close to the intermediate billet rolling unit; the post finishing roll is the first roll of the finishing mill group (or F1 mill roll) and is positioned on one side of the finishing vertical roll close to the finishing mill group. The front feeding roller is in a loaded state, the rear finishing roller is in a non-loaded state, the fact that the intermediate billet is pulled to pass through the front feeding roller and does not reach the rear finishing roller is indicated, the rolling force of the finish rolling vertical roller is obtained, the rolling force is larger than a pressure threshold value, the duration time is located in a preset duration time interval, the fact that the finish rolling vertical roller successfully bites in the billet head position is indicated, and the billet head position is determined to pass through the finish rolling vertical roller; otherwise, the rolling force is larger than the pressure threshold value, which indicates that the billet head position does not reach the finish rolling vertical roll; similarly, the duration is smaller than a preset duration interval, which indicates that the billet head position may pass through the finish rolling vertical roller, and the duration is longer than the preset duration interval, which indicates that the billet head position may be blocked on the finish rolling vertical roller, and the billet head position cannot be determined to pass through the finish rolling vertical roller. The pressure threshold and the duration interval can be set according to actual requirements, for example, the pressure threshold is set to be 60KN, and the duration interval is set to be 0.1-1 s.
In practical application, because the function of the finish rolling vertical roller is to implement centering in the finish rolling process, the running speed of the hot rolling production line is higher, if the control speed of reducing the target roll gap to the preset roll gap is lower, the condition that the finish rolling vertical roller does not reach the preset roll gap after the first roll of the finishing mill group is loaded possibly occurs, and the expected centering effect of the finish rolling vertical roller is not achieved. Based on this, in a specific embodiment, controlling the finish rolling vertical roll to reduce from the target roll gap to the preset roll gap includes:
obtaining a roller distance and a traction speed of an intermediate billet, wherein the roller distance is the interval distance between a finish rolling vertical roller and a rear finishing roller; obtaining a lower speed limit for adjusting the roll gap according to the roll spacing and the traction speed; and outputting a driving instruction of a target speed according to the lower speed limit so as to reduce the target roll gap to a preset roll gap, wherein the target speed is a roll gap adjusting speed greater than the lower speed limit.
Specifically, the pulling time can be obtained by dividing the roll spacing by the pulling speed, the pulling time represents the time for the intermediate billet to reach the rear finishing roll (i.e., the first roll of the finishing mill group) from the finishing vertical roll at the pulling speed, the adjustment amount for reducing the finishing vertical roll from the target roll gap to the preset roll gap is known, therefore, the lower speed limit can be obtained by dividing the pulling time by the adjustment amount, the lower speed limit represents the minimum adjustment speed for reducing the target roll gap to the preset roll gap, the roll gap adjustment speed greater than the speed is the target speed, for example, 15mm/s, and the reduction of the target roll gap to the preset roll gap based on the driving instruction of the target speed can ensure that the finishing vertical roll achieves the expected centering effect. The upper limit of the speed of the adjusting roll gap exists between the upper limit of the speed and the lower limit of the speed of the target speed. On the hot continuous rolling production line, after the tail part of the upper intermediate billet leaves the F1 rolling mill, the roller gap control strategy of the finish rolling vertical roller in the next period starts to act so as to ensure the stable operation of the hot continuous rolling production line.
Based on the same inventive concept as the control method, the embodiment of the invention further provides a roll gap control device of a finish rolling vertical roll, referring to fig. 2, the device includes:
the obtaining module 201 is configured to obtain a billet head width of an intermediate billet and a preset roll gap of a finish rolling vertical roll, where the preset roll gap is a roll gap value of the finish rolling vertical roll for performing centering control on a middle position of the intermediate billet;
an obtaining module 202, configured to input the billet width into a preset calculation model when the billet width is greater than a lower limit value of a roll gap, to obtain an offset compensation amount of the finish rolling vertical roll, where the lower limit value of the roll gap is a minimum roll gap of the intermediate billet passing through the finish rolling vertical roll;
an adjustment traction module 203, configured to adjust a roll gap of the finish rolling vertical roll to a target roll gap according to the offset compensation amount, and traction a billet head position of the intermediate billet through the finish rolling vertical roll;
and the control module 204 is used for controlling the finish rolling vertical roller to be reduced from the target roll gap to the preset roll gap after the billet head position is determined to pass through the finish rolling vertical roller so as to perform finish rolling centering control on the middle position.
In an alternative embodiment, the acquisition module includes:
the first acquisition submodule is used for acquiring rolling pass and width measurement data of the intermediate billet;
and the first determining submodule is used for determining the maximum value in the width measurement data as the width of the billet when the rolling pass is the last pass.
In an alternative embodiment, the first determining sub-module comprises:
the obtaining unit is used for obtaining rolling process information of the intermediate billet;
a first determining unit for determining whether to curl the intermediate blank using a coil box according to the rolling process information;
the second determining unit is used for determining a target data set in the width measurement data according to a preset initial measurement period when the roll carrying signal of the last pass is received when the intermediate blank is curled without using a plate winding box, and determining the maximum value of the target data set as the width of the blank head;
and the third determining unit is used for comparing the current width measurement data with the width measurement data of the previous period until reaching a preset final measurement period when the intermediate blank is curled by using a plate winding box and receiving the roller unloading signal of the last pass, and determining the maximum value in the comparison result as the width of the blank head.
In an alternative embodiment, the obtaining module includes:
a first obtaining sub-module for, when the intermediate blank is not conveyed to the finish rolling vertical roller through the plate winding box, according to the formula
Obtaining the offset compensation quantity K, wherein B is the width of the blank head, and M is the lower limit value of the roll gap for conveying the intermediate blank through the plate coil box;
and the second obtaining submodule is used for obtaining the offset compensation quantity K according to a formula K=B-N when the intermediate billet is conveyed to the finish rolling vertical roller through the plate coil box, wherein B is the billet head width, and N is the lower limit value of the roller gap of the intermediate billet which is not conveyed through the plate coil box.
In an alternative embodiment, the first obtaining submodule comprises a first setting unit, wherein the first setting unit is used for setting the lower limit value M of the roll gap to be M=15 mm and setting the offset compensation amount K to be 0 < K.ltoreq.20mm when the intermediate billet is not conveyed to the finish rolling vertical roll through a plate coil box;
the second obtaining submodule comprises a second setting unit and a third setting unit, wherein the second setting unit is used for setting the offset compensation amount N to be N=7mm when the intermediate billet is conveyed to the finish rolling vertical roll through the plate coil box and the billet head width is not larger than a width threshold value;
the third setting unit is used for setting the lower limit value N of the roll gap to be N=10 mm when the intermediate billet is conveyed to the finish rolling vertical roll through the plate coil box and the billet head width is larger than the width threshold value, and the offset compensation amount K is set to be 7 < K and less than or equal to 30mm.
In an alternative embodiment, the control module includes:
the second obtaining submodule is used for obtaining the rolling force of the finish rolling vertical roll when the hot rolling production line is in a target state, wherein the target state is that a front feeding roller of the finish rolling vertical roll is in a loaded state and a rear finishing roller is in an unloaded state;
and the second determining submodule is used for determining that the billet head position passes through the finish rolling vertical roller when the rolling force is larger than the pressure threshold value and the duration time is within a preset duration time interval.
In an alternative embodiment, the control module further includes:
the third acquisition submodule is used for acquiring a roller distance and the traction speed of the intermediate billet, wherein the roller distance is the interval distance between the finish rolling vertical roller and the rear finishing roller;
the third obtaining submodule is used for obtaining the lower speed limit of the regulating roll gap according to the roll spacing and the traction speed;
and the output sub-module is used for outputting a driving instruction of a target speed according to the lower speed limit so as to reduce the target roll gap to the preset roll gap, wherein the target speed is a roll gap adjusting speed which is larger than the lower speed limit.
Based on the same inventive concept as the control method, an embodiment of the invention further provides an electronic device comprising a processor and a memory coupled to the processor, the memory storing instructions which, when executed by the processor, cause the electronic device to perform the steps of any one of the control methods.
Based on the same inventive concept as the control method, the embodiments of the present invention also provide a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of any one of the control methods.
The technical scheme provided by the embodiment of the invention has at least the following technical effects or advantages:
the method comprises the steps of obtaining the width of a billet head of an intermediate billet and a preset roll gap for centering control of a finish rolling vertical roll on the middle position of the intermediate billet, when the width of the billet head is larger than the lower limit value of the roll gap of the intermediate billet passing through the finish rolling vertical roll, indicating that the position of the billet head is possibly blocked on the finish rolling vertical roll, inputting the width of the billet head into a preset calculation model when the bite failure of the intermediate billet on the finish rolling vertical roll occurs, obtaining the offset compensation amount of the finish rolling vertical roll, adjusting the roll gap of the finish rolling vertical roll to a target roll gap according to the offset compensation amount, and pulling the position of the billet head of the intermediate billet to pass through the finish rolling vertical roll, so that the position of the billet head is smoothly bitten into the finish rolling vertical roll, after the position of the billet head is determined to pass through the finish rolling vertical roll, controlling the finish rolling vertical roll to be reduced to the preset roll gap from the target roll gap, and performing centering control on the intermediate billet by the whole control strategy, and ensuring centering control of the ultra-wide intermediate billet is smoothly performed on the finish rolling vertical roll, thereby improving the reliability of the finish rolling vertical roll control.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (modules, systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. A roll gap control method for a finish rolling vertical roll, the method comprising:
obtaining the width of a billet head of an intermediate billet and a preset roll gap of a finish rolling vertical roll, wherein the preset roll gap is a roll gap value of the finish rolling vertical roll for centering control on the middle position of the intermediate billet;
when the width of the billet head is larger than the lower limit value of the roll gap, inputting the width of the billet head into a preset calculation model to obtain the offset compensation quantity of the finish rolling vertical roll, wherein the lower limit value of the roll gap is the minimum roll gap of the intermediate billet passing through the finish rolling vertical roll;
adjusting the roll gap of the finish rolling vertical roll to a target roll gap according to the offset compensation quantity, and pulling the billet head position of the intermediate billet to pass through the finish rolling vertical roll;
and after the billet head position is determined to pass through the finish rolling vertical roll, controlling the finish rolling vertical roll to be reduced from the target roll gap to the preset roll gap so as to perform finish rolling centering control on the middle position.
2. The roll gap control method of a finish rolling vertical roll according to claim 1, wherein the obtaining of the head width of the intermediate billet comprises:
acquiring rolling pass and width measurement data of the intermediate billet;
and when the rolling pass is an end pass, determining the maximum value in the width measurement data as the billet head width.
3. The roll gap control method of a finish rolling vertical roll according to claim 2, wherein the determining the maximum value in the width measurement data as the billet width comprises:
acquiring rolling process information of the intermediate billet;
determining whether to curl the intermediate blank using a coil box according to the rolling process information;
if not, determining a target data set in the width measurement data according to a preset initial measurement period when the roll load signal of the last pass is received, and determining the maximum value of the target data set as the width of the billet;
if yes, comparing the current width measurement data with the width measurement data of the previous period when the roll unloading signal of the last pass is received, stopping until a preset ending measurement period is reached, and determining the maximum value in the comparison result as the width of the billet head.
4. The roll gap control method of the finish rolling roll according to claim 1, wherein the inputting the billet width into a preset calculation model to obtain the offset compensation amount of the finish rolling roll comprises:
when the intermediate billet is not conveyed to the finish rolling vertical roll through the plate winding box, the formula is adopted
B is more than or equal to M, and the offset compensation quantity K is obtained, wherein B is the width of the blank head, and M is the lower limit value of the roll gap for conveying the intermediate blank through the plate coil box;
when the intermediate billet is conveyed to the finish rolling vertical roller through the plate rolling box, the offset compensation quantity K is obtained according to a formula K=B-N, wherein B is the billet head width, and N is the lower limit value of the roll gap of the intermediate billet which is not conveyed through the plate rolling box.
5. The method for controlling a roll gap of a finish rolling vertical roll according to claim 4, wherein,
when the intermediate billet is not conveyed to the finish rolling vertical roll through a plate winding box, setting the lower limit value M of the roll gap to be M=15 mm, and setting the offset compensation amount K to be more than 0 and less than or equal to 20mm;
when the intermediate billet is conveyed to the finish rolling vertical roll through a plate coil box and the billet head width is not more than a width threshold value, setting the offset compensation quantity N to be N=7mm;
and when the intermediate billet is conveyed to the finish rolling vertical roll through a plate winding box and the billet head width is larger than the width threshold, setting the roll gap lower limit value N to be N=10 mm, and setting the offset compensation amount K to be 7 < K < 30mm.
6. The roll gap control method of the finish rolling stand according to claim 1, wherein determining the position of the billet through the finish rolling stand comprises:
when the hot rolling production line is in a target state, obtaining the rolling force of the finish rolling vertical roller, wherein the target state is that a front feeding roller of the finish rolling vertical roller is in a loaded state, and a rear finishing roller is in a non-loaded state;
if the rolling force is larger than the pressure threshold value and the duration is in a preset duration interval, determining that the billet head position passes through the finish rolling vertical roller.
7. The roll gap control method of the finish rolling roll according to claim 1, wherein the controlling the finish rolling roll to be reduced from the target roll gap to the preset roll gap comprises:
obtaining a roller distance and a traction speed of the intermediate billet, wherein the roller distance is the interval distance between the finish rolling vertical roller and a rear finishing roller;
obtaining a lower speed limit for adjusting the roll gap according to the roll spacing and the traction speed;
and outputting a driving instruction of a target speed according to the lower speed limit so as to reduce the target roll gap to the preset roll gap, wherein the target speed is a roll gap adjusting speed which is larger than the lower speed limit.
8. A roll gap control device for a finishing vertical roll, the device comprising:
the device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the width of a billet head of an intermediate billet and a preset roll gap of a finish rolling vertical roll, wherein the preset roll gap is a roll gap value of the finish rolling vertical roll for centering control on the middle position of the intermediate billet;
the obtaining module is used for inputting the width of the billet into a preset calculation model when the width of the billet is larger than the lower limit value of the roll gap, so as to obtain the offset compensation quantity of the finish rolling vertical roll, wherein the lower limit value of the roll gap is the minimum roll gap of the intermediate billet passing through the finish rolling vertical roll;
the adjusting and pulling module is used for adjusting the roll gap of the finish rolling vertical roll to a target roll gap according to the offset compensation quantity and pulling the blank head position of the intermediate blank to pass through the finish rolling vertical roll;
and the control module is used for controlling the finish rolling vertical roller to be reduced from the target roll gap to the preset roll gap after the billet head position is determined to pass through the finish rolling vertical roller, so as to perform finish rolling centering control on the middle position.
9. An electronic device comprising a processor and a memory coupled to the processor, the memory storing instructions that, when executed by the processor, cause the electronic device to perform the steps of the method of any of claims 1-7.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the steps of the method according to any one of claims 1-7.
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| CN202310220053.3A CN116274412A (en) | 2023-03-02 | 2023-03-02 | Roll gap control method and device for finish rolling vertical roll |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310220053.3A CN116274412A (en) | 2023-03-02 | 2023-03-02 | Roll gap control method and device for finish rolling vertical roll |
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