CN111702018B - Method for improving thickness precision of rolling target of medium plate - Google Patents

Method for improving thickness precision of rolling target of medium plate Download PDF

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CN111702018B
CN111702018B CN202010607957.8A CN202010607957A CN111702018B CN 111702018 B CN111702018 B CN 111702018B CN 202010607957 A CN202010607957 A CN 202010607957A CN 111702018 B CN111702018 B CN 111702018B
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CN111702018A (en
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温方金
刘坚锋
李学明
吴长才
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Xinyu Iron and Steel Co Ltd
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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
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • 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
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B21B37/165—Control of thickness, width, diameter or other transverse dimensions responsive mainly to the measured thickness of the product
    • 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
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B21B37/18—Automatic gauge control
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/02—Transverse dimensions
    • B21B2261/04—Thickness, gauge

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  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)

Abstract

The invention discloses a method for increasing the rolling target thickness of a medium plateThe method for measuring the precision specifically comprises the following steps: s1, calculating the difference T between the average thickness measurement value of the rolled piece at the outlet of the last 3-pass and the thickness set value3E(ii) a S2, based on the difference value T3EAnd correcting the set value of the roll gap of the last pass. The method comprises the steps of measuring the actual thermal state thickness of a rolled piece at the outlet of the last but one pass through a thickness gauge arranged behind a rolling mill, so as to calculate the average thickness of the rolled piece at normal temperature, calculating the deviation between the average thickness and the outlet thickness of the rolled piece set by the last but one pass through a thickness feedback model, acting on the roll gap setting of the final pass as an additional roll gap adjusting quantity, reducing the deviation between the final rolling thickness of a steel plate and a set target thickness, and overcoming the defect that the conventional last pass thickness feedback method cannot correct the final rolling thickness of the current steel plate.

Description

Method for improving thickness precision of rolling target of medium plate
Technical Field
The invention belongs to the technical field of steel, and particularly relates to a method for improving the target thickness precision of medium plate rolling.
Background
The target thickness precision of the steel plate rolled by the heavy and medium plate mill is a main technical index reflecting the equipment level of the mill and the quality of a control system. The target thickness precision of the steel plate depends on the calculation precision of a pass plan setting model, the pass plan setting model calculates a rolling schedule which meets the calculation precision requirement of the target thickness, the rolling process requirement and the maximum production efficiency on the basis of mathematical models such as a rolling force model, a temperature model, a bounce model, a roller wear model, a roller thermal crown model, a rolling moment model and the like, parameters such as the rolling force, the roller gap, the speed and the like of each pass are set, and inter-pass self-adaptive calculation and set value calculation of the rest passes are carried out according to the measured values of the rolling force, the roller gap, the temperature and the like of each pass, so that the rolling thickness of the steel plate approaches to a target value.
In actual production, factors influencing the target thickness precision of steel plate rolling are many, for example, the assumed condition of model calculation has deviation from the actual condition, the rolling mill pressing data calculation error, the physical property parameters of steel grades are inaccurate, and the working condition changes, so that the actual rolled steel plate thickness has deviation from the set target thickness. Therefore, the heavy and medium plate mill is usually provided with a thickness gauge after the finishing mill, so that when the last rolling is completed, the thickness gauge measures and calculates the average thickness of the steel plate, and the thickness feedback model performs thickness feedback calculation according to the deviation of the measured average thickness and the set target thickness, so as to correct the set thickness precision of the next steel plate. At present, the heavy and medium plate mill adopts a final thickness feedback method as a necessary technical means for solving the problem of different plate differences. Most of thickness feedback model technologies are simple, thickness control is easy to be unstable, actual using effects are poor, some are forced to shield a thickness feedback function, in addition, the last thickness feedback method cannot timely correct the final rolling thickness of the currently rolled steel plate, the correction action is delayed, when the steel type, the specification, the working condition and the like of the subsequent steel plate to be rolled are greatly changed, the current thickness feedback value is not completely applicable, and especially under the conditions that the first or continuous blocks are rolled after roll changing, the specification or the steel type is changed, rolling is restarted after long-time standby and the like, the deviation between the actual rolling thickness of the steel plate and a set target value is often large.
Disclosure of Invention
The invention provides a method for improving the rolling target thickness precision of a medium plate, aiming at reducing the deviation between the rolling thickness average value of the medium plate and a set thickness target value.
In order to achieve the purpose, the invention adopts the technical scheme that: a method for improving the thickness precision of a rolling target of a medium plate specifically comprises the following steps:
s1, calculating the difference T between the average thickness measurement value of the rolled piece at the outlet of the last 3-pass and the thickness set value3E；
S2, based on the difference value T3EAnd correcting the set value of the roll gap of the last pass.
Further, the corrected setting value of the last roll gap
Figure BDA0002559826410000021
The method comprises the following specific steps:
Figure BDA0002559826410000022
wherein h is0Is steelTarget plate thickness, S (j) Rolling Mill springback value of pass number j, GaIs a roll gap deviation adaptive value, alpha is a thickness deviation confidence coefficient, T3EThe difference value of the average thickness measurement value of the rolled piece at the outlet of the last 3 times and the thickness set value is obtained.
Further, the thickness deviation confidence coefficient α reflects the accuracy of the thickness measurement average;
length L measured at the outlet of the last 3 pass of the rolled stock3PGreater than or equal to the total length L of the rolled piece 3T1/2 of (1), i.e. L3P≥L3TWhen the ratio is/2, alpha is 0.5, and when L is3P<L3TAt/2, α is 0.
Further, after the last rolling is finished and the thickness measurement is finished, the self-adaptive value G of the roll gap deviation is obtainedaAnd correcting, wherein the calculation formula is as follows:
Figure BDA0002559826410000023
wherein i is the reciprocal number of the rolled steel sheet, called the sheet number, G0(i) And W (i) are the roll gap offset value and the weighting coefficient of the i-th rolled steel plate, respectively.
Further, the calculation formula of the weighting coefficient w (i) of the ith rolled steel plate is specifically as follows:
Figure BDA0002559826410000031
wherein, Δ t (i) is the time interval between the current time and the rolling completion time of the rolled piece with the plate number i, the time interval exceeds 3600 seconds, and W (i) takes a value of 0.
Further, the roll gap offset value calculation method comprises the following steps:
G0(i)＝Ga(i+1)+Te(i)+αT3E(i)
wherein, Te(i) The difference value T between the average value of the thickness measurement of the plate number i rolled piece after the last rolling and the target thickness3E(i) The plate number i rolled piece is in the third to last passThe difference between the average thickness measurement at the completion of the secondary rolling and the thickness set point at the exit of the secondary rolling pass.
The method for improving the target thickness precision of the medium plate rolling has the following beneficial technical effects:
1) the method comprises the steps that the actual thermal state thickness of a rolled piece is measured at the outlet of the last but one pass through a thickness gauge arranged behind a rolling mill, so that the average thickness of the rolled piece at normal temperature is calculated, the deviation between the average thickness and the outlet thickness of the rolled piece set by the last but one pass is calculated by a thickness feedback model, and the deviation is used as an additional roll gap adjusting quantity to act on the roll gap setting of the final pass, so that the deviation between the final rolling thickness of a steel plate and the set target thickness can be reduced, and the defect that the current final rolling thickness of the steel plate cannot be corrected by a conventional last pass thickness feedback method is overcome;
2) when the last thickness feedback calculation is carried out, the new feedback value is related to the roll gap offset value of the maximum 10 steel plates rolled in the latest 1 hour and the weighted value attenuated along with time, so that the stability and the precision of the thickness control are further improved.
Drawings
FIG. 1 is a schematic diagram of a medium plate rolling process provided by an embodiment of the present invention;
fig. 2 is a flowchart of a method for improving the target thickness precision of a medium plate rolling according to an embodiment of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be given in order to provide those skilled in the art with a more complete, accurate and thorough understanding of the inventive concept and technical solutions of the present invention.
Fig. 1 is a schematic diagram of a medium plate rolling process provided in an embodiment of the present invention, fig. 2 is a flowchart of a method for improving a target thickness precision of a medium plate rolling provided in an embodiment of the present invention, and the method for improving the target thickness precision of the medium plate rolling is described with reference to fig. 1 and fig. 2, and specifically, the method includes the following steps:
(1) after the roller of the rolling mill is changed, the zero-adjusting of the pressing must be carried out, or the production is interrupted for a short time according to the requirement, and the zero-adjusting of the pressing is carried out again on the rolling mill.
(2) Receiving data such as slab size, steel grade, temperature, rolling target size and the like of discharged rolled pieces, calculating a rolling process meeting the calculation precision requirement of the target thickness and a rolling schedule with maximized production efficiency by using a pass plan setting model on the basis of mathematical models such as a rolling force model, a temperature model, a bounce model, a roller wear model, a roller thermal crown model, a rolling moment model and the like, and then rolling from the pass number j equal to 1.
(3) Before each pass is rolled, the pass plan setting model sets the rolling parameters of the corresponding pass, and the method comprises the following steps: the roll gap control device comprises a roll force set value, a roll gap set value, an outlet thickness set value and a speed set value, wherein the roll gap set value has the following calculation formula:
Gs(j)＝h(j)-S(j)-Ga；
wherein h (j) is the set value of the outlet thickness of pass number j, Gs(j) Set value of roll gap of pass number j, and S (j) roll bounce value (including housing bounce and roll system bounce) of pass number j, GaIs the self-adaptive value of the roll gap deviation. And when each pass is rolled, calculating self-adaptive parameters such as the rolling force, the rolling moment, the temperature and the like among the passes according to the measured values of the rolling parameters such as the rolling force, the roll gap, the temperature and the like of the related pass which is rolled, updating the calculated values of the rolling parameters of the rest passes, and setting the rolling parameters of the next pass.
(4) And tracking and calculating the number of rolled channels, the total number of channels and the number of remaining channels of the rolled piece. And when the number of the remaining passes is 3, sending the chemical components and the temperature of the rolled piece to a thickness gauge, and when the last but one pass of rolling is finished, correcting the thickness measurement data by the thickness gauge, namely converting the thickness in a hot state into a thickness value in a cold state.
(5) And in the last-but-one rolling process, the thickness gauge automatically enters a measuring mode. When the rolled piece enters the thickness gauge area in the forward direction, the thickness gauge continuously measures the thickness of each point in the length direction of the rolled piece, the measuring point is located on the rolling center line, and the length of the rolled piece passing through the thickness gauge is calculated by the linear speed time integral of the working roll of the rolling mill. When the rolled piece reversely leaves the thickness gauge area, the speed of the rolled piece is set to be 0, and the condition that the length of the rolled piece calculated by speed time integral is smaller and smaller, and even is a negative value is avoided. And when the rolled piece completely leaves the thickness gauge area, the thickness gauge calculates the average thickness of the rolled piece and sends the average thickness to the pass plan setting model.
(6) Calculating the average value T of the thickness measurement of the outlet rolled piece at the last third time3MAnd a thickness set value T3CDeviation of (T)3E＝T3M-T3CHere the average value T of the thickness measurement3MThe thickness set value T is the mean value of the corrected thickness measurement values3CSetting a pass plan setting model, taking the thickness deviation confidence coefficient alpha (alpha is more than or equal to 0 and less than or equal to 1) into consideration, and correcting the roll gap set value Gs during the last pass setting calculation to obtain the corrected value of the roll gap set value
Figure BDA0002559826410000051
The calculation formula is as follows:
Figure BDA0002559826410000052
wherein h is0The target thickness of the steel sheet. And (3) setting model precision, thickness gauge precision, measured rolled piece length and thickness deviation rule from the last to the last according to the pass plan, and determining alpha value through repeated debugging.
Generally, the thickness gauge is about 10 meters away from the central line of the rolling mill, only one section of the rolled piece passes through the thickness gauge at the outlet of the last but one pass, the last but one pass is required to be reversely rolled, and at the moment, the thickness gauge only measures the thickness of part of the length of the rolled piece. In order to reflect the total thickness of the rolled piece as much as possible, the length L of the rolled piece passing through the thickness gauge section3PMust be greater than or equal to the full length L 3T1/2 when L is3P<L3T2, taking alpha as 0; when L is3P≥L3TAnd/2, taking alpha as 0.5.
(7) After the last pass rolling is finished and the thickness measurement is finished, the thickness feedback calculation is carried out, and the roll gap deviation adaptive value G is correctedaThe calculation method specifically comprises the following steps:
Figure BDA0002559826410000053
wherein i is the reciprocal sequence number of the rolled steel plate, i is 0-9, i is 0 after the rolling is finished, i is 1 before the rolling, and so on, i is 9, that is, 10 steel plates which are rolled recently are adopted at most, Go(i) The roll gap offset value of the ith steel plate, and W (i) the roll gap offset value Go(i) The weighting coefficient of (2).
The calculation method of the weighting coefficient w (i) is specifically as follows:
Figure BDA0002559826410000061
where Δ t (i) is a time interval (seconds) between the current time and the rolling completion time of the plate number i rolled piece, and w (i) exceeding 3600 seconds is 0.
Offset value of roll gap Go(i) The calculation method specifically comprises the following steps:
Go(i)＝Ga(i+1)+Te(i)+αT3E(i)
wherein, Te(i) The difference value T between the average value of the thickness measurement and the target thickness value when the last pass of the plate number i rolled piece is finished3E(i) The difference value G between the average value of the thickness measurement of the plate number i rolled piece at the time of finishing the last three rolling passes and the thickness set value at the exit of the passa(i +1) is a roll gap deviation adaptive value of a plate number (i +1) rolled piece; after the rolling mill is pressed against zero adjustment, GaSetting an initial value, GaThe initial value is determined by debugging.
(8) And (5) finishing the last rolling, and calculating self-adaptive parameters such as rolling force, rolling moment, temperature and the like among plates.
(9) And (5) rolling the next steel plate, and repeating the steps (2) to (8).
The method for improving the target thickness precision of the medium plate rolling has the following beneficial technical effects:
1) the method comprises the steps that the actual thermal state thickness of a rolled piece is measured at the outlet of the last but one pass through a thickness gauge arranged behind a rolling mill, so that the average thickness of the rolled piece at normal temperature is calculated, the deviation between the average thickness and the outlet thickness of the rolled piece set by the last but one pass is calculated by a thickness feedback model, and the deviation is used as an additional roll gap adjusting quantity to act on the roll gap setting of the final pass, so that the deviation between the final rolling thickness of a steel plate and the set target thickness can be reduced, and the defect that the current final rolling thickness of the steel plate cannot be corrected by a conventional last pass thickness feedback method is overcome;
2) when the last thickness feedback calculation is carried out, the new feedback value is associated with the roll gap offset value of the maximum 10 steel plates rolled in the latest 1 hour and the weighted value attenuated along with time, so that the thickness control stability and precision are further improved;
3) the deviation between the actual rolling thickness of the steel plate and the set target thickness is basically controlled within 0.1mm, the thickness hit rate of the rolled steel plate is greatly improved, and the length hit rate of the steel plate is also improved; because the rolling thickness precision of the steel plate is improved, the target thickness of the steel plate can be set according to the negative tolerance within the thickness tolerance range, and the rolling thickness of the steel plate plays an important role in improving the yield.
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.

Claims (4)

1. The method for improving the target thickness precision of the medium plate rolling is characterized by comprising the following steps:
s1, calculating the difference T between the average thickness measurement value of the rolled piece at the outlet of the last 3-pass and the thickness set value3E；
S2, based on the difference value T3ECorrecting the set value of the roll gap of the last pass;
corrected last pass roll gap set value
Figure FDA0003304106950000011
The method comprises the following specific steps:
Figure FDA0003304106950000012
wherein h is0Target thickness of steel sheet, S (j) Rolling Mill springback value of pass number j, GaIs a roll gap deviation adaptive value, alpha is a thickness deviation confidence coefficient, T3EThe difference value between the average thickness measurement value of the rolled piece at the outlet of the last 3 times and the thickness set value is obtained;
the thickness deviation confidence coefficient alpha reflects the accuracy of the average value of the thickness measurement, the length L of the rolled piece measured at the outlet of the last 3 times3PGreater than or equal to the total length L of the rolled piece3T1/2 of (1), i.e. L3P≥L3TWhen the ratio is/2, alpha is 0.5, and when L is3P<L3TAt/2, α is 0.
2. The method for improving the target thickness precision of the medium plate rolling according to claim 1, wherein the adaptive value G for the roll gap deviation is obtained after the last rolling is finished and the thickness measurement is finishedaAnd correcting, wherein the calculation formula is as follows:
Figure FDA0003304106950000013
wherein i is the reciprocal number of the rolled steel sheet, called the sheet number, G0(i) And W (i) are the roll gap offset value and the weighting coefficient of the i-th rolled steel plate, respectively.
3. The method for improving the target thickness precision of the medium plate rolling according to claim 2, wherein the weighting coefficient w (i) of the ith rolled steel plate is calculated by the following formula:
Figure FDA0003304106950000021
wherein, Δ t (i) is the time interval between the current time and the rolling completion time of the rolled piece with the plate number i, the time interval exceeds 3600 seconds, and W (i) takes a value of 0.
4. The method for improving the target thickness precision of the medium plate rolling according to claim 2, wherein the roll gap offset value calculating method comprises the following steps:
G0(i)＝Ga(i+1)+Te(i)+αT3E(i)
wherein, Te(i) The difference value T between the average value of the thickness measurement of the plate number i rolled piece after the last rolling and the target thickness3E(i) The difference value G between the average value of the thickness measurement of the plate number i rolled piece at the time of finishing the last three rolling passes and the thickness set value at the exit of the passaAnd (i +1) is the roll gap deviation adaptive value of the plate number (i +1) rolled piece.
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