CN104338757B - A kind of method for controlling mill star-up rolling sequence roll-force - Google Patents

A kind of method for controlling mill star-up rolling sequence roll-force Download PDF

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CN104338757B
CN104338757B CN201310329989.6A CN201310329989A CN104338757B CN 104338757 B CN104338757 B CN 104338757B CN 201310329989 A CN201310329989 A CN 201310329989A CN 104338757 B CN104338757 B CN 104338757B
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force
roll
actual achievement
rolling
adaptation coefficient
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CN104338757A (en
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朱大维
羌菊兴
王欣
张文宾
舒萦
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B37/00Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/58Roll-force control; Roll-gap control
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B37/00Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/16Control of thickness, width, diameter or other transverse dimensions
    • B21B37/18Automatic gauge control
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B2261/00Product parameters
    • B21B2261/02Transverse dimensions
    • B21B2261/04Thickness, gauge
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B2265/00Forming parameters
    • B21B2265/12Rolling load or rolling pressure; roll force

Abstract

A kind of method for controlling mill star-up rolling sequence roll-force, belongs to metal rolled field.It is arranged by the collection to milling train actual achievement data under minimum threading speed running status and combination according to rolling mill practice requirement and strip parameter to be rolled, introduces actual achievement roll-force adaptation coefficient MAConcept, will roll force adaptive actual achievement value MAWith n-th roll-force adaptation coefficient average value MNThe absolute value δ of difference, with roll-force adaptation coefficient average valueWith the standard deviation sigma of ith actual achievement roll-force adaptation coefficientiIt is compared, if the σ of absolute value δ≤3n, then select to rolling force setup value PsRevised, be defined as the startup roll-force of next same specification coiled strip steel, the actual achievement of control milling train starts roll-force;If δ>3σn, then the startup roll-force not to next same specification coiled strip steel revise, still according to original process parameter control milling train actual achievement start roll-force;Thereby lift rolling stability and thickness control accuracy of the strip in mill star-up rolling sequence, effectively prevent broken belt, reduce the overproof length of thickness.

Description

A kind of method for controlling mill star-up rolling sequence roll-force
Technical field
The invention belongs to metal rolled control field, more particularly to a kind of control method of mill rolling force.
Background technology
The Thickness Control Technology of cold rolling mill is the control technology of most critical in metal rolled production process, and it is usual It is for according to the yield strength and each passage for treating rolled material(Or frame, referred to as passage below)Inlet thickness, outlet The device parameters such as thickness, tension force, working roll roll neck, using mathematical modeling, calculating obtains roll-force, while passing through AGC (Automatic Gauge Control, automatic thickness control)Technology treats rolling sheets to realize(The strip being commonly called as, similarly hereinafter)'s Thickness control.
It can be seen that, in cold-rolling process technology controlling and process, the determination of roll-force has great significance in cold rolling production, It is to formulate process system, adjustment milling train, improve product quality, expand product scope, sufficiently and reasonably digging equipment potential, reality The visual plant parameter and technological parameter of existing Computer Control in Manufacturing Process, it may be said that rolling force model is parameters setting process In most important mathematical modeling.
Therefore tube rolling simulation is built upon the models such as resistance of deformation, coefficient of friction, roll flattening, advancing slip and roller be fast and calculated On the basis of, it had both determined the computational accuracy of roll gap, also have impact on the working effect of pressure AGC.
Therefore, selection can accurately reflect the rolling force model of flow of metal process and improve rolling force model setting essence Degree is significant to improving production quality.
In actual production process control procedure, the calculating of roll-force is theoretical usually using classical Hill rolling force models Formula:
(Formula 1)
P represents roll-force in formula;Represent material average deformation drag;H represents inlet thickness;H represents exit thickness; R ' expressions working roll flattens radius;QpRepresent friction effect coefficient;ntRepresent tension force influence coefficient;B represents strip width.
However, AGC input controls are that have certain precondition, in the startup rolling sequence of milling train, the thickness of strip Control fully relies on the initial set value for starting roll-force, if the startup tube rolling simulation result of institute's foundation is not accurate enough, It need to be intervened manually.
Publication date is on 2 6th, 2008, discloses one in Publication No. CN101116874A Chinese invention patent application Plant " reversible cold rolling mill flow quantity AGC band thickness control method ", it includes milling train in/out mouthful window of web velocities and the detection step of thickness Suddenly;The detection of mill modulus and band plastic coefficient and calculation procedure;Pre-control AGC, monitoring in the control of hydraulic AGC AGC and hydraulic pressure APC rate-determining steps;Characterized by further comprising the step of the mathematical modeling for setting up flow quantity AGC control;Calculate Go out the step of the theoretical thick difference of milling train outlet side band;The step of carrying out the calculating of roll gap compensation adjustment amount;By the roll gap of flow quantity AGC Regulated quantity δ ShAfter pi regulator is adjusted, as milling train thickness control, i.e. the roller of hydraulic AGC inner ring hydraulic pressure APC meets compensation rate The step of carrying out closed loop thickness control.It can be seen that, it is that, by developing AGC control technologies, the method that is compensated by roll gap is realized Real-time thickness control.
Publication date is on March 6th, 2013, is disclosed in Publication No. CN102950155A Chinese invention patent application " a kind of AGC control methods based on second flow calculated thickness ", it is calculated tandem mill and gone out by second flow AGC Controlling model Mouth thickness of strip;When tachymeter can not normally be put into, tachymeter measurement milling train outlet window of web velocities is replaced using calculating speed, Participate in second flow AGC controls;Speed parameter is modified, it is ensured that the stabilization of the operation of rolling;It will show that roll gap and speed are adjusted Section amount participates in the thickness control of milling train, realizes second flow AGC closed-loop control.It can be seen that, it is according to the equal original of second flow Manage to realize accurate thickness control.
Authorized announcement date be on January 23rd, 2008, Authorization Notice No. for CN100363122C Chinese invention in disclose A kind of " control method of cooling liquid for cold rolling strip steel ", its technical scheme is the friction in cold rolling by process computer The coolant rate under normal speed is calculated with conduction caloric value;When strip reaches milling train, volume is sent under process computer Coolant rate under constant speed degree;Coolant rate under the normal speed that PLC is issued according to process computer is by mill speed Matched, the application traffic after matching as control valve control set-point;The degree of control of control valve is calculated, then by PLC Electric signal control valve opening is converted into, the wherein degree of control of control valve is calculated by mathematical modeling.The invention passes through number Influence of the model compensation caused by the factors such as pipeline, nozzle is learned, makes flow actual value substantially equal with application traffic, is reduced Belt steel thickness fluctuation caused by flow deviation, improves belt steel thickness control accuracy.It can be seen that, it is by reducing coolant stream The thickness fluctuation that amount deviation is caused, to improve thickness control accuracy.
In actual production process, the stage of rational thick poor scope is put into and is adjusted to from mill star-up to AGC(Referred to as For startup stage, similarly hereinafter)It is unstable, easily occurs " broken belt " failure, and whole section strip steel is at " overproof " state.
In summary, it is effectively anti-for how to lift rolling stability and thickness control accuracy of the strip in startup stage Only broken belt, the reduction overproof length of thickness, there is no preferable solution, this just takes the lead thickness control, product to strip at present The raising of total quality and the reduction of comprehensive production cost, bring certain restriction and difficulty.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of method for controlling mill star-up rolling sequence roll-force, its By the Data Collection to starting rolling sequence, combination and calculating, roll-force is compensated, same material is quickly determined, with rule The startup roll-force of lattice volume, and be applied in the control of quantity-produced model specification, can be in extensive actual production process In effectively improve take the lead thickness control accuracy, prevent broken belt and start failure, meet user improve product quality requirement, reduction The production cost of manufacturing enterprise, improves overall economic efficiency.
The technical scheme is that:A kind of method for controlling mill star-up rolling sequence roll-force, including basis are provided The yield strength and milling equipment parameter of belt steel material to be rolled, using Hill rolling force model theoretical formulas, calculating is rolled Power, while realizing the thickness control of strip by AGC, obtains meeting the rolled band steel product of rolling technological parameter requirement, its It is characterised by:
101st, according to rolling technological parameter requirement and strip to be rolled product parameters, obtain belt steel rolling when width, roll Speed processed, inlet thickness, exit thickness, entrance total tension, outlet total tension and roll-force data parameters;
102nd, mill star-up;
103rd, milling train is maintained at threading speed X and strip is rolled;
104th, actual achievement data of the strip on inlet of rolling mill calibrator position are collected, first group of actual achievement data A is obtained1, institute The first group of actual achievement data A stated1Including width b1, mill speed S1, inlet thickness H1, exit thickness h1, entrance total tension ZEnter 1、 Export total tension ZGo out 1With actual achievement roll-force PAct1
105th, by the first delay Y1Afterwards, actual achievement data of the strip same point in milling train center position are collected, are obtained Second group of actual achievement data A2, described second group of actual achievement data A2Including width b2, mill speed S2, inlet thickness H2, outlet it is thick Spend h2, entrance total tension ZEnter 2, outlet total tension ZGo out 2With actual achievement roll-force PAct2
106th, by the second delay Y2Afterwards, collect strip same point and export the actual achievement data on calibrator position in milling train, Obtain the 3rd group of actual achievement data A3, described the 3rd group of actual achievement data A3Including width b3, mill speed S3, inlet thickness H3, go out Mouth thickness h3, entrance total tension ZEnter 3, outlet total tension ZGo out 3With actual achievement roll-force PAct3;
107th, arrangement is combined to three groups of resulting actual achievement data, obtains one group of combination actual achievement number for being directed to the passage According to AZ
108th, will combination actual achievement data AZ1Bring Hill rolling force model theoretical formulas into, calculating is obtained according to actual achievement data meter The roll-force P of calculationCalc
109th, the roll-force P that will be calculated according to actual achievement dataCalcWith second group of actual achievement data A2In actual achievement roll-force PAct2 Compare, obtain actual achievement roll-force adaptation coefficient MA
110th, above-mentioned 103~109 step is repeated, order obtains at least 20 times actual achievement roll-force adaptation coefficients successively;
111st, roll-force adaptation coefficient average value is calculatedWith the standard deviation of ith actual achievement roll-force adaptation coefficient σi
112nd, actual achievement roll-force adaptation coefficient M is calculated respectivelyAWith n-th roll-force adaptation coefficient average value MNDifference Absolute value δn
If the 113, actual achievement roll-force adaptation coefficient MAWith n-th roll-force adaptation coefficient average value MNThe absolute value δ of difference ≤3σn, then new adaptation coefficient average value M is calculatedN+1And standard deviation sigmaN+1
114th, according to the technological parameter data of strip and the new adaptation coefficient average value M calculatedN+1And standard deviation σN+1, calculate the rolling force setup value P by revisions, it is defined as the startup roll-force of next same specification coiled strip steel;
115th, according to the startup roll-force P of next same specification coiled strip steels, the actual achievement startup roll-force of control milling train;
If the 116, actual achievement roll-force adaptation coefficient MAWith n-th roll-force adaptation coefficient average value MNThe absolute value δ of difference >3σn, then the startup roll-force not to next same specification coiled strip steel revise, still according to original process parameter control milling train Actual achievement starts roll-force;
117th, by introducing actual achievement roll-force adaptation coefficient and the startup roll-force progress to next same specification coiled strip steel Compensate, revise, quickly the determination startup roll-force of same material, same specification with coil of strip, and be applied to quantity-produced model and set In fixed control, thickness control accuracy is taken the lead to effectively improve, " broken belt " is prevented and starts failure, meet user and improve product quality Requirement.
Specifically, in described 105 and 106 steps, the first described delay Y1With the second delay Y2Obtain in the following manner :
If inlet of rolling mill calibrator and the distance for exporting calibrator to milling train central point are respectively D1And D2, then
Wherein, Y1For the first delay, unit is the second;Y2For the second delay, unit is the second;X is the threading speed of milling train, single Position for m/min.
In 107 step, arrangement is combined to three groups of resulting actual achievement data, one group is obtained and is directed to the passage Combination actual achievement data AZ1Process, carried out according to the following steps:
By the 1st group of actual achievement data A1In inlet thickness H1, the 2nd group of actual achievement data A2In width b2, mill speed S2, enter Mouth total tension ZEnter 2, outlet total tension ZGo out 2, actual achievement roll-force PAct2With the 3rd group of actual achievement data A3In exit thickness h3Again group Close, constitute one group of combination actual achievement data A new, for the passageZ1
In 108 step, described Hill rolling force model theoretical formulas are:
P is roll-force in formula,For material average deformation drag, H is inlet thickness, and h is exit thickness, and R ' is work The flat radius of roll-in, QpFor friction effect coefficient, ntCoefficient is influenceed for tension force, b is strip width.
In 109 step, described actual achievement roll-force adaptation coefficient MAObtained by following equation:
Wherein, PActFor actual achievement roll-force, PCalcFor the roll-force calculated according to actual achievement data;
I.e.:The roll-force P calculated according to combination actual achievement dataCalcWith second group of actual achievement data A2In actual achievement roll-force PAct2Ratio, be actual achievement roll-force adaptation coefficient MA
In 111 step, described roll-force adaptation coefficient average valueObtained by following equation:
In formulaFor roll-force adaptation coefficient average value, n is calculation times, MiFor ith roll-force adaptation coefficient Average value(I=1,2,3 ...;Particularly, M0=1.0).
In 111 step, the standard deviation sigma of described ith roll-force adaptation coefficientiObtained by following equation :
N is calculation times, M in formulaiFor the average value of ith roll-force adaptation coefficient(I=1,2,3 ...;Particularly, M0 =1.0), σiFor the standard deviation of ith roll-force adaptation coefficient(I=1,2,3 ...).
In 112 step, described actual achievement roll-force adaptation coefficient MAIt is flat with n-th roll-force adaptation coefficient Average MNThe absolute value δ of differencenObtained by following equation:
δ=|MA-Mn|
Wherein, MAFor actual achievement roll-force adaptation coefficient, MNFor n-th roll-force adaptation coefficient average value.
In 114 step, the rolling force setup value P by revisionsObtained by following equation:
P in formulasFor the rolling force setup value of revision,For material average deformation drag, H is inlet thickness, and h is outlet Thickness, R ' is that working roll flattens radius, QpFor friction effect coefficient, ntCoefficient is influenceed for tension force, b is strip width,To roll Force adaptive coefficient average value processed.
The method of present invention control mill star-up rolling sequence roll-force, according to rolling technological parameter requirement and strip to be rolled Product parameters, pass through the collection to milling train actual achievement data under minimum threading speed X running statuses and combination arranged, introduce real Achievement roll-force adaptation coefficient MAConcept, will roll force adaptive actual achievement value MAWith n-th roll-force adaptation coefficient average value MN The absolute value δ of difference, with roll-force adaptation coefficient average valueWith the standard deviation sigma of ith actual achievement roll-force adaptation coefficientiEnter Row compares, if the σ of absolute value δ≤3n, then select to rolling force setup value PsRevised, be defined as next same specification coiled strip steel Start roll-force, according to the startup roll-force of next same specification coiled strip steel, the actual achievement of control milling train starts roll-force;If δ>3σn, Then the startup roll-force not to next same specification coiled strip steel is revised, and is still opened according to the actual achievement of original process parameter control milling train Dynamic roll-force;Thereby lift rolling stability and thickness control accuracy of the strip in mill star-up rolling sequence, effectively prevent Broken belt, the reduction overproof length of thickness.
Compared with the prior art, it is an advantage of the invention that:
By the Data Collection to starting rolling sequence, combination and calculating, form one kind and effectively determine to start to roll The method of power, can quickly determine same material, the startup roll-force of same specification volume, and be applied to quantity-produced model specification In control, it can effectively improve and take the lead thickness control accuracy, prevent " broken belt " and start the generation of failure failure, meet user's raising The requirement of product quality.
Brief description of the drawings
Fig. 1 is the position relationship schematic diagram between rolling mill body of the present invention and entrance and outlet calibrator;
Fig. 2 is the block diagram of technical solution of the present invention.
1 is entrance calibrator in figure, and 2 be outlet calibrator, and 3 be rolling mill body.
Embodiment
The present invention will be further described with reference to the accompanying drawings and examples.
In Fig. 1, it is assumed that the distance of entrance and outlet calibrator to milling train central point is respectively D1And D2, then:
Wherein, Y1For the first delay, unit is the second;Y2For the second delay, unit is the second;X is the threading speed of milling train, single Position for m/min.
Fig. 2 gives the block diagram of technical solution of the present invention.
For the tube rolling simulation of milling train, foregoing classical Hill rolling force models theoretical formula can be used(Formula has Hold in vivo and will not be repeated here):
(Formula 1)
P in formula:Roll-force;Material average deformation drag;H:Inlet thickness;h:Exit thickness;R’:Working roll is flattened Radius;Qp:Friction effect coefficient;nt:Tension force influences coefficient;b:Strip width.
However, AGC input controls are that have certain precondition, start the thickness control of rolling sequence strip completely according to Initial set value by starting roll-force, if startup tube rolling simulation is not accurate enough, needs to be intervened manually.Opened from milling train It is unstable to move AGC and put into and be adjusted to stage of rational thick poor scope, easily occurs broken belt, and whole section is all overproof.
In technical scheme, by the Data Collection to starting rolling sequence, combination and calculating, one kind is formd The effective method for determining to start roll-force, the rolling stability of rolling sequence and thickness control essence are being started for lifting strip Degree, effectively prevents broken belt, reduces the overproof length of thickness.
A, tube rolling simulation formula:
Because formula 1 is theoretical calculation model, the technical program introduces adaptation coefficient M, to be mended to roll-force Repay, then new tube rolling simulation formula is changed into:
Ps=P.M (Formula 2)
M in formula:Roll-force adaptation coefficient;Ps:Start controlled rolling power.
Because the yield strength of description of materials is different, the error between different passage actual achievement roll-forces and calculating roll-force Also it is different, therefore M can first be classified by passage again by material.So that it is determined that roll-force means that roll-force to be determined Adaptation coefficient M, it is therefore necessary to be precisely calculated by effective means.
B, the method for data capture for starting rolling sequence:
From new roll-force formula(Formula 2)Understand:
There is certain deviation between the model calculation value P and actual achievement roll-force of roll-force, but it is desirable that control is rolled Power processed is setting value PsIt is better closer to actual achievement value, it is worth ratio M to call roll-force adaptation coefficient the two.
It is a process being continually changing due to starting the Rolling Production stage, and setting value P uses the production of strip supplied materials What product specification data was calculated, therefore the P under product specification data qualificationsIt can not really measure and obtain.
Assuming that the actual achievement data in the operation of rolling can be obtained, then actual achievement roll-force adaptation coefficient MAFor:
(Formula 3)
P in formulaAct:Actual achievement roll-force;PCalc:The roll-force calculated according to actual achievement data.
The actual achievement method of data capture for starting rolling sequence is described below.
B1, the scheme for formulating Data Collection:
(1)Strip same point is collected respectively in entrance calibrator 1, milling train central point 2, outlet calibrator 3(See institute in Fig. 1 Show), actual achievement data on totally 3 positions;
(2)It is determined that the data item to be collected:
Determine Hill rolling force model theoretical formulas(Formula 1)All input parameters.Except the strength of materials number of strip According to outside roll data, width, mill speed, inlet thickness, exit thickness, entrance tension force during belt steel rolling, outlet tension force, The data such as roll-force can be obtained from strip manufacturing technique requirent(It is shown in Table 2).
The roll-force adaptive polo placement of table 2 needs the data collected
Title Data item unit
Width mm
Speed m/min
Inlet thickness mm
Exit thickness mm
Entrance total tension kN
Export total tension kN
Roll-force ton
B2, Data Collection process:
(1)Mill star-up;
(2)Milling train is maintained at threading speed(Minimum speed)X is rolled;
(3)Collect the 1st group of actual achievement data;
(4)Treat Y1After second, the 2nd group of actual achievement data are collected;
(5)Treat Y2After second, the 3rd group of actual achievement data are collected;
(6)Increasing speed rolling shuts down repeat step(1)~(5).
C, roll-force adaptation coefficient determination method:
C1, data preparation and the calculating of actual achievement roll-force adaptation coefficient:
(1)By the inlet thickness in the 1st group of data, width, speed, entrance total tension, the outlet General Logistics Department in the 2nd group of data Exit thickness in tension force, roll-force and the 3rd group of data is reassembled into 1 group of new actual achievement data;
(2)New actual achievement data are substituted into the calculating of formula 1 and obtain PCalc
(3)By PCalcWith the actual achievement roll-force P in and 2 groups of dataActSubstitute into formula 3 and calculate MA
C2, roll-force adaptation coefficient inheritance method
Introduce roll-force adaptation coefficient mean value calculation formula:
(Formula 4)
In formulaRoll-force adaptation coefficient average value;n:Calculation times;Mi:Ith roll-force adaptation coefficient Average value(I=1,2,3 ...;Particularly:M0=1.0).
Standard deviation calculation formula:
(Formula 5)
σ in formulai:The standard deviation of ith roll-force adaptation coefficient(I=1,2,3 ...).
After calculation times n is more than 20, the distribution of roll-force adaptation coefficient, can be by 6 σ close to normal distributionnModel The scope of the natural fluctuation for the process of being considered as is enclosed, that is, allows i.e. roll-force adaptation coefficient actual achievement value MAIn intervalInterior fluctuation, herein interval outside be exactly singular point, should give discarding.
Therefore we set:
δ=|MA-Mn|
δ is rolling force adaptive actual achievement value MAWith n-th roll-force adaptation coefficient average value MNThe absolute value of difference.
Then there are following decision condition and criterion selective:
If the σ of δ≤3n, new adaptation coefficient average value and standard deviation are calculated using formula 4 and formula 5;
If δ>3σn, then without the succession of adaptation coefficient, i.e. Mn+1=Mn, σn+1n
D, the determination method for starting roll-force:
The roll-force adaptation coefficient average value that the data such as belt steel material, specification and formula 4 are calculated substitutes into formula 2 Calculate rolling force setup value Ps
(Formula 6)
Determined once the revision of milling train starts roll-force, then remaining step is exactly to be set by existing control system and production It is standby, produced according to the operational factor set, its specific control process and step are no longer described herein.
Embodiment:
The strip of certain material specification has been carried out 26 roll-force adaptive polo placements, the setting number of strip during the 27th calculating According to as shown in table 3 below, the calculating of roll-force adaptation coefficient is carried out according to the method described above, and determines the startup of next same specification volume Roll-force(By taking the first passage as an example).
Specification data and setting data during certain first passes of strip of table 3 is as follows:
Title Setting value
Threading speed 30m/min
Width 1045mm
Inlet thickness 2000mm
Exit thickness 1390mm
Entrance unit tension force 2.9kg/mm2
Exporting unit's tension force 15.8kg/mm2
Working roll roll neck 97.8mm
Step 1:Receipt is collected and arranged:
(1)Collect after strip starts strip same point when threading speed is rolled entrance calibrator, milling train central point, Export the actual achievement data on 3 positions of calibrator:
(2)By the inlet thickness in the 1st group of data, width, speed, entrance total tension, the outlet General Logistics Department in the 2nd group of data Exit thickness in tension force, working roll roll neck and the 3rd group of data is reassembled into new actual achievement data:
Step 2:Calculate MA
(1)The roll-force P calculated according to actual achievement dataCalc
v=29.7(m/min)
H=1997(mm)
h=1379(mm)
b=1045(mm)
tbFor preceding tensile stress;
tfFor rear tensile stress;
R=97.8(mm)
Formula 1 is substituted into obtain:
PCalc=459.24(ton)
On above-mentioned Hill rolling force models theoretical formula (i.e. formula 1), because it belongs to known technology in the industry, this area Technical staff knows its implication and solution mode, can on the implication of each digital code in its specific calculating process or formula Referring to " the Hill roll-forces explicit formula for considering rolled piece elastic deformation "(《Steel research》03 phase in 2000 P.32-33,46, make Person:Lv Cheng, strong will outstanding person, Liu Xianghua, Wang Guodong)Related content in one text, is no longer described herein.
(2)Calculate MA
PAct=455.61(ton)
Step 3:The succession of roll-force adaptation coefficient:
n=26
I.e. n >=20, need to carry out data detection.
Mn=M26=0.993205
δ=|MA-M26|=|0.992096-0.993205|=0.001109
σ26=0.000946,3 σ26=0.002838
δ<3σ26
Therefore formula is used(4)Calculate new roll-force adaptation coefficient average value:
Use formula(5)Calculate standard deviation:
Step 4:Determine the startup roll-force of next same specification volume:
Supplied materials of next same specification with coil of strip and setup parameter are as follows:
v=30.0(m/min)
H=2000(mm)
h=1390(mm)
b=1053(mm)
tb=2.9(kg/mm2)
tf=15.8(kg/mm2)
R=100.0(mm)
And=0.993164
Formula 6 is together substituted into, calculates and starts roll-force:
Ps=466.06×0.993165=462.87(ton)
Therefore mill star-up roll-force of the next same specification of the passage with coil of strip can be thereby determined that, the reality of milling train is controlled accordingly Achievement starts roll-force, thereby lifts rolling stability and thickness control accuracy of the strip in mill star-up rolling sequence, you can Reach the goal of the invention for effectively preventing broken belt, reducing the overproof length of thickness.
Technical scheme is by the Data Collection to starting rolling sequence, combination and calculates, the startup to milling train Roll-force is compensated, and can quickly determine the startup roll-force of same material, same specification with coil of strip, and be applied to quantity-produced Model specification control in, can be effectively improved in extensive actual production process and take the lead thickness control accuracy, prevent broken belt and Start failure, meet the requirement that user improves product quality, reduce the production cost of manufacturing enterprise, improve overall economic efficiency.
Enterprise's new mill where applicant of the invention(Including tandem mill and singlestandmill)Equipment monomer Test phase is applied, and can quickly determine the startup roll-force of milling train, and improves in large-scale production process the band of strip The control accuracy of head thickness.
It the method can be widely used in the control field of mill rolling force.

Claims (8)

1. a kind of method for controlling mill star-up rolling sequence roll-force, including yield strength according to belt steel material to be rolled and roll Machine equipment parameter, using Hill rolling force model theoretical formulas, calculating obtains roll-force, while realizing strip by AGC Thickness control, obtains meeting the rolled band steel product of rolling technological parameter requirement, it is characterised in that:
101st, according to rolling technological parameter requirement and the product parameters of strip to be rolled, width, rolling speed during acquisition belt steel rolling Degree, inlet thickness, exit thickness, entrance total tension, outlet total tension and roll-force data parameters;
102nd, mill star-up;
103rd, milling train is maintained at threading speed X and strip is rolled;
104th, actual achievement data of the strip on inlet of rolling mill calibrator position are collected, first group of actual achievement data A is obtained1, described One group of actual achievement data A1Including width b1, mill speed S1, inlet thickness H1, exit thickness h1, entrance total tension ZEnter 1, outlet it is total Tension force ZGo out 1With actual achievement roll-force PAct1
105th, by the first delay Y1Afterwards, actual achievement data of the strip same point in milling train center position are collected, second group is obtained Actual achievement data A2, described second group of actual achievement data A2Including width b2, mill speed S2, inlet thickness H2, exit thickness h2, enter Mouth total tension ZEnter 2, outlet total tension ZGo out 2With actual achievement roll-force PAct2
106th, by the second delay Y2Afterwards, collect strip same point and export the actual achievement data on calibrator position in milling train, obtain the Three groups of actual achievement data A3, described the 3rd group of actual achievement data A3Including width b3, mill speed S3, inlet thickness H3, exit thickness h3, entrance total tension ZEnter 3, outlet total tension ZGo out 3With actual achievement roll-force PAct3
107th, arrangement is combined to three groups of resulting actual achievement data, obtains one group of combination actual achievement data AZ1
108th, will combination actual achievement data AZ1Hill rolling force model theoretical formulas are substituted into, calculates and obtains what is calculated according to actual achievement data Roll-force PCalc
109th, the roll-force P that will be calculated according to actual achievement dataCalcWith second group of actual achievement data A2In actual achievement roll-force PAct2Phase Than obtaining actual achievement roll-force adaptation coefficient MA
110th, above-mentioned 103~109 step is repeated, order obtains at least 20 times actual achievement roll-force adaptation coefficients successively;
111st, roll-force adaptation coefficient average value is calculatedWith the standard deviation sigma of ith actual achievement roll-force adaptation coefficienti
112nd, actual achievement roll-force adaptation coefficient M is calculated respectivelyAWith n-th roll-force adaptation coefficient average value MnPoor is absolute Value δn
If the 113, actual achievement roll-force adaptation coefficient MAWith n-th roll-force adaptation coefficient average value MNAbsolute value δ≤3 of difference σn, then new adaptation coefficient average value M is calculatedN+1And standard deviation sigmaN+1
114th, according to the technological parameter data of strip and the new adaptation coefficient average value M calculatedN+1And standard deviation sigmaN+1, Calculate the rolling force setup value P by revisions, it is defined as the startup roll-force of next same specification coiled strip steel;
115th, according to the startup roll-force P of next same specification coiled strip steels, the actual achievement startup roll-force of control milling train;
If the 116, actual achievement roll-force adaptation coefficient MAWith n-th roll-force adaptation coefficient average value MNThe absolute value δ > 3 of difference σn, then the startup roll-force not to next same specification coiled strip steel revise, still according to the reality of original process parameter control milling train Achievement starts roll-force;
117th, compensated by introducing actual achievement roll-force adaptation coefficient and startup roll-force to next same specification coiled strip steel, Revision, quickly determines same material, the startup roll-force of same specification coiled strip steel, and be applied to the control of quantity-produced model specification In, thickness control accuracy is taken the lead to effectively improve, " broken belt " is prevented and starts failure, user is met and improves wanting for product quality Ask.
2. according to the method for the control mill star-up rolling sequence roll-force described in claim 1, it is characterised in that described 105 In 106 steps, the first described delay Y1With the second delay Y2Obtain in the following manner:
If inlet of rolling mill calibrator and the distance for exporting calibrator to milling train central point are respectively D1And D2, then
Y 1 = D 1 X , Y 2 = D 2 X
Wherein, Y1For the first delay, unit is the second;Y2For the second delay, unit is the second;X is the threading speed of milling train, and unit is M/min.
3. according to the method for the control mill star-up rolling sequence roll-force described in claim 1, it is characterised in that described 107 In step, arrangement is combined to three groups of resulting actual achievement data, one group of combination actual achievement data A is obtainedZ1Process, under Row step is carried out:
By the 1st group of actual achievement data A1In inlet thickness H1, the 2nd group of actual achievement data A2In width b2, mill speed S2, entrance it is total Tension force ZEnter 2, outlet total tension ZGo out 2, actual achievement roll-force PAct2With the 3rd group of actual achievement data A3In exit thickness h3Reconfigure, structure Into one group of combination actual achievement data A newlyZ1
4. according to the method for the control mill star-up rolling sequence roll-force described in claim 1, it is characterised in that described 108 In step, described Hill rolling force model theoretical formulas are:
P = K &OverBar; &CenterDot; R &prime; ( H - h ) &CenterDot; Q p &CenterDot; n t &CenterDot; b
P is roll-force in formula,For material average deformation drag, H is inlet thickness, and h is exit thickness, and R ' flattens for working roll Radius, QpFor friction effect coefficient, ntCoefficient is influenceed for tension force, b is strip width.
5. according to the method for the control mill star-up rolling sequence roll-force described in claim 1, it is characterised in that described 109 In step, described actual achievement roll-force adaptation coefficient MAObtained by following equation:
M A = P A c t P C a l c ;
Wherein, PActFor actual achievement roll-force, PCalcFor the roll-force calculated according to actual achievement data;
I.e.:The roll-force P calculated according to combination actual achievement dataCalcWith second group of actual achievement data A2In actual achievement roll-force PAct2's Ratio, is actual achievement roll-force adaptation coefficient MA
6. according to the method for the control mill star-up rolling sequence roll-force described in claim 1, it is characterised in that described 112 In step, described actual achievement roll-force adaptation coefficient MAWith n-th roll-force adaptation coefficient average value MnThe absolute value δ of differencen Obtained by following equation:
δn=| MA-Mn|
Wherein, MAFor actual achievement roll-force adaptation coefficient, MnFor n-th roll-force adaptation coefficient average value.
7. according to the method for the control mill star-up rolling sequence roll-force described in claim 1, it is characterised in that described 114 In step, the rolling force setup value P by revisionsObtained by following equation:
P s = K &OverBar; &CenterDot; R &prime; ( H - h ) &CenterDot; Q p &CenterDot; n t &CenterDot; b &CenterDot; M &OverBar;
P in formulasFor the rolling force setup value of revision,For material average deformation drag, H is inlet thickness, and h is exit thickness, R ' is that working roll flattens radius, QpFor friction effect coefficient, ntCoefficient is influenceed for tension force, b is strip width,For roll-force certainly Accommodation coefficient average value.
8. according to the method for the control mill star-up rolling sequence roll-force described in claim 1, it is characterised in that the control The method of mill star-up rolling sequence roll-force, according to rolling technological parameter requirement and the product parameters of strip to be rolled, by right The collection and combination of milling train actual achievement data under minimum threading speed X running statuses are arranged, and introduce actual achievement rolling force adaptive system Number MAConcept, will roll force adaptive actual achievement value MAWith n-th roll-force adaptation coefficient average value MNThe absolute value δ of difference, with rolling Force adaptive coefficient average value processedWith the standard deviation sigma of ith actual achievement roll-force adaptation coefficientiIt is compared, if absolute value δ ≤3σn, then select to rolling force setup value PsRevised, be defined as the startup roll-force of next same specification coiled strip steel, under The startup roll-force of one same specification coiled strip steel, the actual achievement of control milling train starts roll-force;If the σ of δ > 3n, then not to next same specification The startup roll-force of coiled strip steel is revised, and still starts roll-force according to the actual achievement of original process parameter control milling train;Thereby come Rolling stability and thickness control accuracy of the strip in mill star-up rolling sequence are lifted, effectively prevents broken belt, reduction thickness from surpassing Poor length.
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