CN116550765A - High-precision quick-response thickness control method for hot continuous rolling equipment - Google Patents
High-precision quick-response thickness control method for hot continuous rolling equipment Download PDFInfo
- Publication number
- CN116550765A CN116550765A CN202310536392.2A CN202310536392A CN116550765A CN 116550765 A CN116550765 A CN 116550765A CN 202310536392 A CN202310536392 A CN 202310536392A CN 116550765 A CN116550765 A CN 116550765A
- Authority
- CN
- China
- Prior art keywords
- thickness
- strip steel
- continuous rolling
- hot continuous
- deviation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005096 rolling process Methods 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 38
- 230000004044 response Effects 0.000 title claims abstract description 29
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 73
- 239000010959 steel Substances 0.000 claims abstract description 73
- 230000007246 mechanism Effects 0.000 claims abstract description 39
- 238000003825 pressing Methods 0.000 claims abstract description 12
- 238000004364 calculation method Methods 0.000 claims abstract description 9
- 230000001105 regulatory effect Effects 0.000 claims abstract description 8
- 230000001276 controlling effect Effects 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000007689 inspection Methods 0.000 claims description 2
- 230000010354 integration Effects 0.000 claims description 2
- 238000009966 trimming Methods 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 description 19
- 238000011897 real-time detection Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000004590 computer program Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000001151 other effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
- B21B37/58—Roll-force control; Roll-gap control
-
- 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
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
Abstract
The invention relates to a thickness control method of high-precision quick-response hot continuous rolling equipment, which comprises N groups of roller mechanisms, a pressing system, a variable frequency system and a thickness control system, wherein the thickness value of strip steel rolled by the roller mechanisms is input into the thickness control system, and the thickness control method of the high-precision quick-response hot continuous rolling equipment comprises the following steps executed by the thickness control system: receiving thickness deviation by a feedforward predictive control regulator F, and calculating to obtain an intermediate quantity K G And according to the intermediate quantity K G Calculating and outputting the thickness feedforward estimated adjustment quantityReceiving the thickness deviation by a thickness feedback proportional integral regulator M, and outputting a thickness feedback proportional integral regulating quantity after calculationFeedforward pre-estimating the thicknessProportional integral adjustment amount fed back with the thicknessAnd (5) obtaining a roll gap adjustment quantity delta G through superposition of a superposition device, and inputting the roll gap adjustment quantity delta G into a pressing system to adjust a roll mechanism. The problem of thickness step fluctuation of the strip steel formed by nonresistible factors is effectively solved.
Description
Technical Field
The invention belongs to a thickness control method of high-precision quick-response hot continuous rolling equipment in the field of metal rolling mill or processed product control thereof.
Background
The existing hot rolled strip thickness control system mainly has two control schemes, namely, automatic gain control of a monitoring AGC (automatic gain control), belongs to a standard proportional integral differential regulation system, and is an automatic control method for automatically regulating the gain of an amplifying circuit along with the signal intensity; secondly, the Smith AGC is adopted, according to the estimated compensation control scheme proposed by the Smith in 1957 by the teaching of the United states, the control algorithm is a proportional or integral controller, as long as the amplification factor of the system is properly selected, the first step of the controller can completely eliminate errors, the problem of the product quality of a pure hysteresis closed loop system is solved, and then the system is converted into a classical control system on strip steel thickness control. Because of the trend pure lag front-end system adjustment, the rapid response adjustment of the thickness step fluctuation of the strip steel formed by the nonresistible factors cannot be realized.
Disclosure of Invention
In order to solve the problems, the invention relates to a thickness control method of high-precision quick-response hot continuous rolling equipment, which comprises N groups of roller mechanisms, a pressing system, a frequency conversion system and a thickness control system, wherein the thickness value of strip steel rolled by the roller mechanisms is input into the thickness control system, and the thickness control method of the high-precision quick-response hot continuous rolling equipment comprises the following steps of: :
receiving the thickness deviation by a feedforward predictive control regulator F, and calculating to obtain an intermediate quantity K G And according to the intermediate quantity K G Calculating and outputting thickness feedforward estimated adjustment quantity delta S MFF ；
The thickness deviation is received by a thickness feedback proportional integral regulator M, and the thickness feedback proportional integral regulating quantity delta S is output after calculation MFM ；
Feedforward pre-estimating the thickness by an adjustment amount delta S MFF Proportional integral adjustment quantity DeltaS is fed back with the thickness MFM And (5) obtaining a roll gap adjustment quantity delta G through superposition of a superposition device, and inputting the roll gap adjustment quantity delta G into a pressing system to adjust a roll mechanism.
The second aspect of the invention relates to a high-precision quick-response thickness control system of hot continuous rolling equipment, which comprises at least one processor; and a memory storing instructions that are executed by the at least one processor.
The method for controlling the thickness of the hot continuous rolling equipment has the beneficial effects that the problem of thickness step fluctuation of strip steel formed by nonresistant factors is effectively solved.
Drawings
FIG. 1 is a flow chart of a feed-forward predictive monitoring AGC (FM-AGC) structure.
Fig. 2 shows a schematic diagram of feed-forward predictive monitoring AGC (FM-AGC). The corresponding meaning of the english names is as follows:
cal represents computation;
LPF denotes a low-pass filter;
ASR represents an acceleration anti-slip control system;
HPC represents a high performance computer cluster;
NEG represents a complement instruction;
smith predictor represents a Smith predictor;
PI represents proportional integral adjustment;
strip Speed represents the conveyor belt;
tickness Gauge represents a thickness Gauge.
FIG. 3 is a diagram of feed forward predictive monitor AGC (FM-AGC) monitor adjustments. The corresponding meaning of the english names is as follows:
FM-AGC represents feedforward predictive monitoring AGC;
m represents a thickness feedback proportioner;
f represents a thickness feed-forward regulator;
ΔS MFF the thickness feedforward predicts the adjustment quantity;
h xi representing the thickness value of the strip steel;
cal represents computation;
delta G roll gap adjustment;
delta V frequency conversion adjustment quantity.
Fig. 4 is a graph of the monitor AGC eight continuous rolling example regulator output and thickness deviation. The corresponding meaning of the english names is as follows:
GM_gauge_Dif represents strip thickness deviation real-time detection data
GM_gauge represents real-time detection data of strip steel thickness
PLC 32_real_spark 23 represents the output Real-time data of eight frame FM-AGC regulator F branches
F8_agc_gap_adj indicates that the eight chassis old AGC adjuster (not using FM-AGC) outputs real-time data
F8_auto_Total_Spd represents eight frame speed real-time data
FIG. 5 is a graph of feed-forward predictive monitoring AGC (FM-AGC) eight continuous rolling example regulator output and thickness deviation. The corresponding meaning of the english names is as follows:
GM_Gauge_Dif represents strip steel thickness deviation real-time detection data;
GM_gauge represents the real-time detection data of the thickness of the strip steel;
wide_m represents strip width real-time detection data;
PLC 32_real_spark 23 represents that the eight continuous rolling FM-AGC regulator F outputs Real-time data in a distributed manner;
f8_magc_gap_adj represents that the eight continuous rolling FM-AGC regulator M outputs real-time data in sections;
f8_agc_gap_adj represents that the eight tandem rolling old AGC regulator (FM-AGC not used) outputs real-time data;
f8_auto_total_spd represents eight continuous rolling speed real-time data.
FIG. 6 shows a plot of feed-forward predictive monitor AGC (FM-AGC) nine continuous rolling 1.15mm strip steel example regulator output and thickness deviation. The corresponding meaning of the english names is as follows:
GM_Gauge_Dif represents strip steel thickness deviation real-time detection data;
GM_gauge represents the real-time detection data of the thickness of the strip steel;
smitih_out_f9 represents that nine tandem rolling FM-AGC regulator F outputs real-time data in sections;
f9_magc_gap_adj represents that the nine-tandem rolling FM-AGC regulator M outputs real-time data in sections;
f9_auto_total_spd represents nine continuous rolling speed real-time data.
Detailed Description
The existing thickness control system comprises a monitoring AGC, and because the thickness value measured by the thickness gauge is lagged relative to the roller, the feedback of the execution result is lagged, and the accurate control of the thickness precision of the strip steel cannot be realized. The related art also reports that the Smith AGC, which includes a Smith controller and a monitor AGC, can solve the problem of when there is a theory in the monitor AGC, however, the Smith AGC trend is regulated by a pure hysteresis front system, and cannot be regulated in a fast response to the thickness step fluctuation of the strip steel formed by the nonresistible factors.
The known Smith AGC has at least the following problems: the thickness step fluctuation generated by the strip steel cannot be quickly responded and adjusted.
Further, in the processing method in the prior art, in the production of products with different specifications, the finish rolling threading stability and the strip steel thickness stability cannot be ensured at the same time; finish rolling up-rolling may cause a change in the overall thickness of the strip.
The following detailed description of the embodiments of the invention is provided with reference to the accompanying drawings.
In view of the technical problems in the prior art, in some embodiments of the present invention, as shown in fig. 3, the hot continuous rolling apparatus includes N sets of roll mechanisms (e.g., servo hydraulic vertical rolls), a reduction system (e.g., servo reduction system), and a variable frequency system (e.g., main motor variable frequency control system) and a thickness control system. The i-1 group frequency conversion system adjusts the speed of the strip steel to output the strip steel, and the i group roller mechanism receives the strip steel and comprises an N group pressing system; the i+1 roller mechanism receives the strip steel output by the i group roller mechanism, and the i group variable frequency system is used for adjusting the speed of the strip steel to output the strip steel; with this cycle to i+1=n, the strip speed is adjusted to output strip, and the reduction system using the nth set of roller mechanismsAnd adjusting the thickness of the strip steel. A thickness control method for improving thickness index by feedforward predictive monitoring AGC is introduced into a thickness control system, and because the thickness control system of the known hot continuous rolling equipment is influenced by thickness step fluctuation, the feedforward predictive monitoring AGC calculates a feedforward predictive value according to some embodiments of the invention, and the feedforward predictive monitoring AGC adjusts the thickness by a feedforward predictive adjustment amount delta S MFF Proportional integral adjustment quantity delta S with thickness feedback MFF And (3) performing 1:1 superposition to reduce the influence of thickness step fluctuation.
Further, other effects (1) of the invention are that when the strip is worn at a constant speed in finish rolling, the thickness stability of the worn strip and the thickness of the strip head and the strip tail are ensured by feedforward pre-estimation monitoring AGC and the thickness compensation of the pressing head and the pressing tail; (2) During finish rolling and speed increasing rolling, the uniformity of the full-length thickness of the strip steel is ensured by feedforward pre-estimation monitoring AGC and acceleration and deceleration thickness compensation.
In some embodiments, the thickness control method of the high-precision quick-response hot continuous rolling equipment performs dead-zone-free complete control on the roll gap, and guides the roll gap to fit the pre-adjustment correction so that the measured actual thickness of the strip is equal to the specification set target thickness (zero deviation). The thickness control method of the high-precision quick-response hot continuous rolling equipment can directly detect the redirected measured thickness, and simultaneously uses an automatic locking function to avoid low-precision adjustment.
In some embodiments of the thickness control method of the high-precision fast-response hot continuous rolling apparatus, the hot continuous rolling apparatus includes N groups of roller mechanisms, a rolling system, a frequency conversion system and a thickness control system, as shown in fig. 3, the thickness control method of the high-precision fast-response hot continuous rolling apparatus includes the following steps performed by the thickness control system:
receiving the thickness deviation by a feedforward predictive control regulator F, and calculating to obtain an intermediate quantity K G And according to the intermediate quantity K G Calculating and outputting thickness feedforward estimated adjustment quantity delta S MFF ；
The thickness feedback proportional integral regulator M receives the real-time thickness deviation, and the thickness feedback proportional integral regulating quantity delta S is output after calculation MFM ；
Feedforward the thicknessEstimated adjustment amount Δs MFF Proportional integral adjustment quantity DeltaS is fed back with the thickness MFM And (5) obtaining a roll gap adjustment quantity delta G through superposition of a superposition device, and inputting the roll gap adjustment quantity delta G into a pressing system to adjust a roll mechanism.
Further, in the thickness control method of the high-precision fast-response hot continuous rolling equipment, the thickness feedforward estimated adjustment quantity delta S in the unit scanning period MFF According to formula I:
wherein:representing the thickness feedforward estimated adjustment amount in the unit scanning period; k (K) G Representing calculating a roll gap adjustment intermediate quantity of a unit scanning period; k'. G Represent K G A trimming amount in a unit scanning period; g I Representing an adjustable integration time constant in memory; g P Representing an adjustable proportionality time constant in the memory; t denotes a unit scan period.
In some embodiments, as shown in fig. 2, the thickness gauge measures the thickness value of the strip steel, obtains thickness deviation in the control system, inputs the thickness deviation into the feedforward prediction monitoring AGC, calculates the thickness deviation through the thickness feedforward prediction control regulator F, and calculates the thickness deviation through the thickness feedback proportional integral regulator.
The thickness deviation is a fitting average value of strip steel thickness deviation detection values corresponding to the length of the strip steel in a specific distance, the length of the strip steel corresponds to the distance between the outlet thickness gauge and the roller mechanism, the running time of the strip steel in the distance is used as a unit scanning period, and the calculated output value is used for adjusting the roller mechanism.
Further, the thickness feedforward estimated adjustment in the unit scanning periodIntermediate quantity K in calculation process G According to formula II:
wherein: k (K) G Representing the thickness feedforward estimated adjustment in the unit scanning periodIntermediate amounts of (2); q (Q) X Representing the vertical plastic deformation coefficient of the strip steel, and reducing the rolling force required by deformation of 1mm by the strip steel of the last frame; m represents the rigidity coefficient of the rolling mill, and the rolling force required by the deformation of the roller mechanism of 1 mm; fh (Fh) G Representing F subsection control roll gap compensation quantity; g represents an adjustable gain factor; Δh represents thickness deviation; v (V) 1 Representing the speed of the strip steel after the roller mechanism; v (V) 2 Representing a speed value in a memory, the embodiment program being constant; t is t G Indicating the time of calculation and execution of the thickness gauge, PLC and hydraulic cylinder.
The thickness control method of the high-precision quick-response hot continuous rolling equipment comprises the following steps of:
and receiving the thickness deviation by a variable frequency calculator, calculating to obtain a variable frequency adjustment quantity delta V, and inputting the variable frequency adjustment quantity delta V into a variable frequency system to adjust a roller mechanism.
Further, in some embodiments of the thickness control system, as shown in fig. 3, the feedforward pre-estimation monitoring AGC outputs a variable frequency adjustment amount Δv, and adjusts the roll speed and thus the strip steel speed. The product of the thickness of the strip steel and the speed of the strip steel is a basically unchanged value, so that the percentage of the deviation of the thickness is basically calculated by a thickness control system, and the percentage of the deviation of the speed of the strip steel can be calculated. The feedforward pre-estimation monitors the variable frequency adjustment quantity DeltaV output by the AGC, and adjusts the roller speed instead of the strip steel speed, so that the strip steel speed deviation percentage also needs to correspond to the roller speed deviation percentage; in the calculation process, the rigidity coefficient of the roller mechanism and the vertical plastic deformation coefficient of the strip steel are used for carrying out material equation operation, and the variable frequency adjustment quantity DeltaV of the roller mechanism is obtained through calculation. This logical operation is used as a basic operation formula in materialogy, and the computer program is directly applied.
The invention is not particularly limited in the way of adjusting the speed of the strip steel integrally, and can be designed based on the following principle, for example. The data transmission delay time is a fixed value, and the regulator gain is only limited by regulating the strip steel transmission time between the roller mechanism and the measuring equipment, and for the compression roller mechanism, the strip steel transmission time is equal to the distance between the roller mechanism and the thickness gauge divided by the strip steel speed. The gain of the regulator must be reduced when the strip transit time is increased, and vice versa, so that the strip speed can be designed as a positive correlation input variable during the roll gap regulation and speed regulation procedures, and the overall regulation rate of the control output is changed in real time to regulate the total strip thickness.
In some embodiments of the thickness control method (corresponding to the actual program) of the high-precision fast-response hot continuous rolling apparatus, as shown in fig. 1, the method includes the following steps:
starting to operate the N groups of roller mechanisms and the controller; inputting original data and reading roller data; the controller depression degree is determined; controlling a tension system; controlling the speed of the strip steel; controlling the deformation resistance; determining a coefficient of friction; determining the forward slip of the strip steel; controlling rolling force; controlling motor torque; controlling the power of a motor; performing motor power limit checking; after the motor power limit check is passed, motor balance check is carried out; after the motor balance inspection is passed, controlling the position of the roller; inputting roller data into the thickness control system; the control flow ends.
In the thickness control method of the hot continuous rolling equipment, the N groups of roller mechanisms comprise 8 groups of roller mechanisms and 9 groups of roller mechanisms.
Further, the thickness control method of the high-precision fast-response hot continuous rolling equipment comprises the following steps, as shown in fig. 1:
when the motor power limit is checked, if the motor power does not reach an ideal state, returning to modify the rolling down system, and if the motor power limit is checked, performing motor power balance check;
when the motor power balance is checked, if the result does not reach an ideal state, the speed of the strip steel is returned and modified, and if the motor power balance is checked, the position of a roller is adjusted;
and inputting roll position data into the thickness control system, adjusting the roll position and adjusting the strip steel speed.
In some embodiments, the process parameters such as finish rolling load, speed system, loop tension, loop height and the like are set according to the steel grade of the strip steel and the thickness of the finished product in a grading manner, and the unreasonable load distribution easily causes the overload of a certain roller mechanism to stop. The speed system also needs to be optimally set according to model grading and equipment conditions, the low speed setting affects the yield and the energy consumption, and the high setting can lead to motor overload and unstable production. The thickness of the strip steel is controlled with high precision on the basis of optimized finish rolling process parameters which are important for stable specification production.
Further, in some embodiments of a thickness control method of a high-precision fast-response hot continuous rolling device, in a rolling process of a hot rolling finishing mill group, consistency of full-length thickness of a finished strip steel is ensured by the following measures: (1) When the finish rolling is carried out at a constant speed, the thickness stability of the strip passing and the thickness index of the strip head and the strip tail are ensured by feedforward pre-estimation monitoring AGC and the thickness compensation of the pressing tail of the pressing head; (2) During finish rolling and speed increasing rolling, the uniformity of the full-length thickness of the strip steel is ensured by feedforward pre-estimation monitoring AGC and acceleration and deceleration thickness compensation.
The technical scheme of the invention is further described below with reference to an embodiment, as shown in fig. 5, the thickness control method of the hot continuous rolling equipment is applied to a certain hot continuous rolling production line, and a continuous rolling unit with the number of roller mechanisms of n=8 is adopted to test products.
On the premise of stabilizing reasonable finish rolling load distribution parameters, the specification of the finished product of the rolled strip steel (the thickness of the finished product is 2.97mm and the width is 593 mm). The original system is adopted to monitor the AGC control system, as shown in figure 4, the thickness deviation detection value of the strip steel at the speed increasing position is-0.03 mm, the tail deviation detection value is 0.031mm, and the thickness deviation detection value of the strip steel is +/-0.031 mm. By adopting a feedforward predictive monitoring AGC control system, as shown in figure 5, the thickness deviation detection value of the strip steel at the speed increasing position is-0.005 mm, the tail deviation detection value is 0.008mm, and the thickness deviation detection value of the strip steel is +/-0.008 mm. The regulator F outputs the real-time data in a subsection manner and has the characteristics of mildness and preposition, the regulator M outputs the real-time data in a subsection manner and has the characteristics of rapidness and stability, and the regulator F and the regulator cooperate to achieve the effect that the thickness control precision is superior to the actual measurement effect of the original system. Meanwhile, the width real-time detection data shows that the width deviation precision is +/-1 mm, and the feedforward estimated monitoring AGC ensures the thickness control precision and the width precision. The data are shown in Table 1 for comparison.
TABLE 1 comparison of thickness accuracy of eight continuous Rolling stock System AGC and FM-AGC control
The technical scheme of the invention is further described below with reference to the second embodiment. As shown in fig. 6, the measurement was performed in a tandem mill (no comparative system).
And rolling the strip steel with the thickness specification of 1.15mm, wherein the accuracy of the measured value of the drift bar thickness deviation is +/-0.012 mm. The rolled hot rolled strip steel, which reaches the control precision in the examples, is a precondition for continuous and stable rolling. The feedforward estimated monitoring AGC is a high-precision quick-response thickness control method for hot continuous rolling equipment, can be widely applied to different kinds of strip steel control production lines, and is superior to other single-kind monitoring AGC control systems at present.
The embodiments and functional operations of the subject matter described in this specification can be implemented in the following: digital electronic circuitry, tangibly embodied computer software or firmware, computer hardware, including the structures disclosed in this specification and structural equivalents thereof, or a combination of one or more of the foregoing. Embodiments of the subject matter described in this specification can be implemented as one or more computer programs, i.e., one or more modules of computer program instructions encoded on one or more tangible, non-transitory program carriers, for execution by, or to control the operation of, data processing apparatus.
Alternatively or additionally, the program instructions may be encoded on a manually-generated propagated signal, e.g., a machine-generated electrical, optical, or electromagnetic signal, that is generated to encode information for transmission to suitable receiver apparatus for execution by data processing apparatus. The computer storage medium may be a machine-readable storage device, a machine-readable storage substrate, a random or serial access memory device, or a combination of one or more of the foregoing.
The term "data processing unit" encompasses all kinds of apparatus, devices, and machines for processing data, including by way of example a programmable processor, a computer, or multiple processors or multiple computers. The device may comprise a dedicated logic circuit, for example an FPGA (field programmable gate array) or an ASIC (application specific integrated circuit). The apparatus may include, in addition to hardware, code that creates an execution environment for the relevant computer program, such as code that constitutes processor firmware, a protocol stack, a database management system, an operating system, or a combination of one or more of them.
Claims (10)
1. The thickness control method of the high-precision quick-response hot continuous rolling equipment comprises N groups of roller mechanisms, a pressing system, a frequency conversion system and a thickness control system, wherein the thickness value of strip steel rolled by the roller mechanisms is input into the thickness control system, and the thickness control method of the high-precision quick-response hot continuous rolling equipment is characterized by comprising the following steps of:
receiving thickness deviation by a feedforward predictive control regulator F, and calculating to obtain an intermediate quantity K G And according to the intermediate quantity K G Calculating and outputting the thickness feedforward estimated adjustment quantity
The thickness deviation is received by a thickness feedback proportional integral regulator M, and the thickness feedback proportional integral regulating quantity is output after calculation
The saidThickness feedforward estimated adjustmentProportional integral adjustment amount feedback with the thickness +.>And (5) obtaining a roll gap adjustment quantity delta G through superposition of a superposition device, and inputting the roll gap adjustment quantity delta G into a pressing system to adjust a roll mechanism.
2. The method for controlling the thickness of a high-precision fast-response hot continuous rolling apparatus according to claim 1, wherein the thickness feedforward pre-estimated adjustment amount in the unit scanning periodAccording to formula I:
wherein:representing the thickness feedforward estimated adjustment amount in the unit scanning period; k (K) G Representing calculating a roll gap adjustment intermediate quantity of a unit scanning period; k'. G Represent K G A trimming amount in a unit scanning period; g I Representing an adjustable integration time constant in memory; g P Representing an adjustable proportionality time constant in the memory; t denotes a unit scan period.
3. The thickness feed-forward predictive adjustment in the unit scan period of claim 2Characterized in that the intermediate quantity K is calculated G According to formula II:
wherein: k (K) G Representing the thickness feedforward estimated adjustment in the unit scanning periodIntermediate amounts of (2); q (Q) X The representation represents the vertical plastic deformation coefficient of the strip steel; m represents the rigidity coefficient of the rolling mill; fh (Fh) G Representing F subsection control roll gap compensation quantity; g represents an adjustable gain factor; Δh represents thickness deviation; v (V) 1 Representing the speed of the strip steel after the roller mechanism; v (V) 2 Representing a speed value in the memory; t is t G Indicating the time of calculation and execution of the thickness gauge, PLC and hydraulic cylinder.
4. The thickness control method of a high-precision fast-response hot continuous rolling apparatus according to claim 1, wherein the thickness control system further performs the steps of:
and receiving the thickness deviation by a variable frequency calculator, calculating to obtain a variable frequency adjustment quantity delta V, and inputting the variable frequency adjustment quantity delta V into a variable frequency system to adjust a roller mechanism.
5. The method for controlling the thickness of a high-precision fast-response hot continuous rolling apparatus according to claim 1, wherein said calculating the variable frequency adjustment Δv by a variable frequency calculator receives the thickness deviation, includes:
the variable frequency calculator receives the thickness deviation, calculates the speed deviation of the strip steel, and calculates the variable frequency adjustment quantity delta V of the roller mechanism by using the rigidity coefficient of the roller mechanism and the vertical molding deformation coefficient of the strip steel according to the speed deviation of the strip steel.
6. The method for controlling the thickness of a high-precision fast-response hot continuous rolling apparatus according to claim 1, wherein said thickness control system further performs the steps of:
and (3) inputting the thickness value of the strip steel by a thickness deviation calculator, and calculating and outputting a fitting average value of the thickness deviation value of the strip steel, namely the thickness deviation.
7. The thickness control method of a high-precision fast-response hot continuous rolling apparatus according to claim 1, characterized in that the control method further comprises the steps of:
starting to operate the N groups of roller mechanisms and the controller; inputting original data and reading roller data; the controller depression degree is determined; controlling a tension system; controlling the speed of the strip steel; controlling the deformation resistance; determining a coefficient of friction; determining the forward slip of the strip steel; controlling rolling force; controlling motor torque; controlling the power of a motor; performing motor power limit checking; after the motor power limit check is passed, motor balance check is carried out; after the motor balance inspection is passed, controlling the position of the roller; inputting roller data into the thickness control system; the control flow ends.
8. The control method according to claim 7, characterized by further comprising the step of:
when the motor power limit is checked, if the motor power does not reach an ideal state, returning to modify the rolling down system, and if the motor power limit is checked, performing motor power balance check;
when the motor power balance is checked, if the result does not reach an ideal state, the speed of the strip steel is returned and modified, and if the motor power balance is checked, the position of a roller is adjusted;
and inputting roll position data into the thickness control system, adjusting the roll position and adjusting the strip steel speed.
9. The method for controlling the thickness of a high-precision fast-response hot continuous rolling apparatus according to claim 1, wherein said N sets of roll mechanisms include 8 sets of roll mechanisms and 9 sets of roll mechanisms.
10. A high precision fast response hot continuous rolling apparatus thickness control system, the system comprising at least one processor; and a memory storing instructions that, when executed by the at least one processor, perform the steps of the method according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310536392.2A CN116550765A (en) | 2023-05-12 | 2023-05-12 | High-precision quick-response thickness control method for hot continuous rolling equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310536392.2A CN116550765A (en) | 2023-05-12 | 2023-05-12 | High-precision quick-response thickness control method for hot continuous rolling equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116550765A true CN116550765A (en) | 2023-08-08 |
Family
ID=87499720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310536392.2A Pending CN116550765A (en) | 2023-05-12 | 2023-05-12 | High-precision quick-response thickness control method for hot continuous rolling equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116550765A (en) |
-
2023
- 2023-05-12 CN CN202310536392.2A patent/CN116550765A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100493748C (en) | Control method for dynamically correcting strip steel thickness deviation by forward slip adaption | |
| CN101780480B (en) | Thickness control compensation method of strip steel head part when welding line passes through rack | |
| CN101618402B (en) | Method for controlling planeness of cold-rolling strip steel | |
| US6227021B1 (en) | Control apparatus and method for a hot rolling mill | |
| US20240004352A1 (en) | Dynamic proportional-integral-derivative (pid) method for plate straightening based on changes in yield strength | |
| CN109647901B (en) | Cold rolling mill feedforward thickness control method and device based on fuzzy control | |
| JP2009208115A (en) | Method and device for calculating parameter of rolling control, and rolling simulation device | |
| CN102274863B (en) | Automatic plate thickness control method of single-stand rolling mill with PI parameter limitation | |
| CN116550765A (en) | High-precision quick-response thickness control method for hot continuous rolling equipment | |
| KR100398765B1 (en) | Method of controlling board thickness, calculating passing schedule, and board thickness controller for continuous rolling machine | |
| CN113245373B (en) | Self-adaptive control method for tension of hot-rolled strip steel loop | |
| JP6781411B2 (en) | Metal plate thickness control method and equipment, and metal plate manufacturing method and equipment | |
| CN102601126B (en) | Steel rail symmetrical full-length fluctuation control method | |
| JP2007061864A (en) | Method for controlling rolling mill | |
| CN112246880A (en) | Twenty-high rolling mill strip shape optimization control method based on feedforward-middle shifting compensation | |
| JP2002336906A (en) | Method and apparatus for controlling rolling mill | |
| JPH0232041B2 (en) | ||
| JP3267841B2 (en) | Controller with phase compensation function | |
| JPS6124082B2 (en) | ||
| CN113458150B (en) | Thickness control method and application of hot-rolled strip steel | |
| CN114393033B (en) | Rolling method for rolling 0.24mm ultrathin material by acid continuous rolling unit | |
| JPH059166B2 (en) | ||
| CN111360083B (en) | Metal plate strip cold continuous rolling anti-saturation thickness control method | |
| CN117960797B (en) | Roller press control method, system and equipment | |
| CN117206342A (en) | Whole-process micro-tension control method and device for continuous rolling unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |