CN107138537B - It is a kind of using electronic and hydraulic pressing rolled aluminum sheet mill method for controlling thickness - Google Patents
It is a kind of using electronic and hydraulic pressing rolled aluminum sheet mill method for controlling thickness Download PDFInfo
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- CN107138537B CN107138537B CN201710429477.5A CN201710429477A CN107138537B CN 107138537 B CN107138537 B CN 107138537B CN 201710429477 A CN201710429477 A CN 201710429477A CN 107138537 B CN107138537 B CN 107138537B
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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
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- 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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Abstract
The present invention principally falls into metal-pressed machine technical field, and in particular to a kind of using electronic and hydraulic pressing rolled aluminum sheet mill method for controlling thickness.First, it is close to set most latter two passes power, and after the completion of passes second from the bottom, keeps roll gap constant, Electro-pressing Bounce distance, average roll gap and the average roll-force during the passes are calculated, and using the roll-force that is averaged as extreme trace time target roll-force;Then, the pre- pendulum roll gap in conjunction with artificial card amount THICKNESS CALCULATION extreme trace time target roll gap and before biting, and executed in place by screw-down;In the extreme trace time operation of rolling, by comparing the deviation of practical roll-force and target roll-force and practical roll gap and target roll gap, outlet thickness deviation is calculated in real time in conjunction with spring equation, and put into closed-loop control, to guarantee thickness and precision.The present invention can accurately be controlled in the case where not depending on calibrator using electronic and hydraulic pressing single chassis rolled aluminum sheet mill thickness.
Description
Technical field
The present invention principally falls into metal-pressed machine technical field, and in particular to a kind of using electronic and hydraulic pressing aluminium
Plate hot-rolling mill method for controlling thickness.
Background technique
The adjusting of mill roll-gap needs to control (APC, Automatic Position by milling train automated location
Control) system is realized.APC is that automatic thickness controls (AGC, Automatic Gauge in strip production process
Control main executing agency) is divided into all-electric, all-hydraulic, electronic and three kinds hydraulic from the source of roll-force.Such as Fig. 1
Shown, in figure, ordinate S indicates that mill roll-gap, abscissa t indicate time, SaIndicate the average roller of slab during the rolling process
Seam;SrIndicate setting roll gap;SbIndicate the practical unloaded average roll gap before slab enters milling train;ΔSabIndicate the bullet of Electro-pressing
Jump amount;ΔSrbIndicate Electro-pressing deviations;tinIndicate that slab enters the milling train moment.For needing big stroke adjustment roll gap
Milling train, generally using the pressure of electronic and Combined hydraulic, Electro-pressing is used for a wide range of coarse adjustment mill roll-gap under immunization with gD DNA vaccine,
Hydraulic pressing is used for small range accurate adjustment mill roll-gap.Since there are gaps between the down screw rod and nut of Electro-pressing, in plate
After base enters milling train, electronic roll gap can generate a Bounce distance, which is generally 0.3~0.5mm.Since electronic roll gap is anti-
Feedback be easy influenced by installation accuracy, rolling mill vibration, therefore in many cases hydraulic pressing can not real-time compensation calculate it is electronic
Roll gap deviation, otherwise mill roll-gap is easy to produce larger fluctuation or even causes to vibrate.
Since the rolled piece thickness in mill roll-gap is not possible to realize in real time directly measurement so far, so in hot continuous rolling or cold rolling
In the operation of rolling of band, a kind of most common method for controlling thickness is by being mounted on the calibrator of milling train outlet to strip thickness
Degree measures, and mill roll-gap is adjusted in this, as feedback signal, realizes the real-time control to thickness.And to the plate of single chassis
For material hot-rolling mill, some is fitted without calibrator, although what is had is mounted with calibrator, due to milling train outlet mechanical equipment
Limitation so that calibrator apart from milling train farther out, while again because single chassis hot-rolling mill mill speed it is slower so that thickness feedback
Signal delay is larger, can not be used to real-time control thickness, so being based on mill spring equation, utilizes rolling force feedback signal and roller
Pressure AGC (or being roll-force AGC) system that seam feedback signal measures thickness indirectly is able to be answered extensively on this kind of milling trains
With.AGC is a basic control means of Modern Rolling Mill, it keeps strip thickness in rolling direction uniform, and it is poor with plate to reduce
It is poor with different plate, so as to improve product quality, improve lumber recovery.
In terms of existing paper and patent, paper " Analysis of Positive Feedback Characteristics of Pressure AGC " (steel, 2007,42 (7): 51-
55) normal pressures AGC is analyzed, it is indicated that since mill modulus C and plasticity coefficient of rolled piece Q can not be obtained accurately,
There are positive feedback regions for pressure AGC, can not accomplish precise thickness control.Patent " is rolled based on the characteristic strip of mill spring
Method for controlling thickness processed " has invented a kind of method for controlling thickness based on mill spring curve, used THICKNESS CALCULATION side
Method is to obtain a fixed expression formula based on pressing data regression, is the full roll surface contact of upper working rolls and lower working rolls due to being pressed against process,
I.e. working roll contact length is identical as working roll length, and upper working rolls and lower working rolls are contacted with strip when rolling, i.e. contact length and plate
Bandwidth is identical, and plate width is less than working roll length, and requirement of the different products to width is also different, this causes
Different from mill spring when rolling when pressing, which considers the influence of plate width with a fixed empirical model, is
Not accurate enough;Meanwhile the characteristic of milling train is also continually changing, such as thermal expansion of rollers and roll wear meeting in the operation of rolling
Cause the variation of mill stiffness He practical roll gap, foregoing invention can not also solve the problems, such as this;Moreover, its control uses pure ratio
Method, it is thick poor to accomplish quickly to eliminate.
Summary of the invention
In view of the above technical problems, the present invention provides a kind of using electronic and hydraulic pressing rolled aluminum sheet mill thickness control
Method, the method can in the case where not depending on calibrator, to electronic and hydraulic pressing single chassis rolled aluminum sheet mill into
The accurate thickness control of row, to guarantee that aluminium plate thickness tolerance falls purpose within the allowable range.
The present invention is achieved by the following technical solutions:
It is a kind of that using electronic and hydraulic pressing rolled aluminum sheet mill method for controlling thickness, the method is based on spring equation,
Identical using adjacent passage roll-force, identical principle of bouncing can not depend on calibrator and to electronic and hydraulic pressing list
Rack rolled aluminum sheet mill carries out accurate thickness prediction, and the accurate control of thickness is realized by closed-loop control.
Further, it the described method comprises the following steps:
Step 1: adjusting the initial setting of roll gap, keeps most latter two passage prediction roll-force close;
Step 2: during passes second from the bottom, real-time accumulated roll gap, roll-force;
Step 3: after the completion of passes second from the bottom, first keeping passage roll gap second from the bottom constant, calculates reciprocal the
Two passage slabs bite the average roll gap S before milling train2b, passage slab second from the bottom bite the average roll gap S after milling train2aWith fall
Several second passages are averaged roll-force P2ave, show that passage slab second from the bottom bites the Bounce distance Δ S of the electronic roll gap in front and back2ab;
Step 4: a mouthful thickness h is measured by manually blocking2, recalculate and obtain extreme trace time new settings roll gap S1r, and allow pressure
Mechanism executes this setting, and roll gap is made to reach S1r;
Step 5: in the extreme trace time operation of rolling, using mill spring equation, outlet thickness deviation Δ h is calculated in real time1,
And PI with parameter variation (PI) control is put into, to guarantee the thickness and precision of finished product aluminium sheet.
Further, which is characterized in that in step 3, the passage slab second from the bottom bites the electronic roll gap in front and back
Bounce distance: Δ S2ab=S2a-S2b。
Further, in step 4, the setting roll gap S of the extreme trace time of acquisition is recalculated1rCalculation are as follows:
S1r=S2b-h2+htarget, wherein h2For people's work card amount exit thickness, htargetIndicate extreme trace time target thickness.
Further, in step 5, the proportionality coefficient k of PI controllerpWith integral coefficient kiAccording to the exit thickness deviation
Δh1Difference, carry out VARIABLE PARAMETER PID CONTROL, i.e., to the exit thickness deviation delta h1Carry out Concourse Division, different thickness deviations
Segment corresponds to different kpAnd ki, segmentation principle is that the exit thickness deviation is bigger, controller proportionality coefficient kpAnd product
Divide coefficient kiTwo parameters are also bigger, and carry out clipping respectively to controller output quantity and integration amount, and integration amount clipping is control
0.4~0.9 times of device output quantity clipping processed.
Further, in step 5, specifically: in the extreme trace time operation of rolling, using mill spring equation, by comparing end
The practical roll-force P of passage1It is averaged roll-force P with passage second from the bottom2aveDeviation and extreme trace time practical roll gap S1Again
Calculate the extreme trace time new settings roll gap S obtained1rAnd the electronic roll gap Bounce distance Δ S of passage second from the bottom2abDeviation, in real time calculate
Exit thickness deviation delta h1, and variable parameters PI control is put into, to guarantee the thickness and precision of finished product aluminium sheet.
Further, in step 5, the exit thickness deviation delta h1=(S1-(S1r+ΔS2ab))+(P1-P2ave)/C2,
C herein2Indicate that in roll-force be P2aveWhen mill modulus.
Further, the mill modulus C2Calculation method include the following steps:
(1) the throw-on pressure P of acyclic homologically trioial process is pressed against in acquisition*With roll gap S*, the thickness of strip h that shuts out at this time*=0, mill stiffness
Meet spring formula:
H=S+ (P-P0)/C+G
In above-mentioned formula, h indicates that exit thickness, S indicate that roll gap, P indicate practical roll-force, P0Indicate pre- throw-on pressure, C table
Show that roll-force is the mill modulus at P moment, G indicates the sum of various compensation rates;
If respectively indicating dependent variable and independent variable with y and x, y=h-S, x=P, a=1/C, b=G-P are enabled0/ C is then full
The unitary once linear equation form of sufficient y=ax+b, utilizes the throw-on pressure P of acquisition*With roll gap S*Obtain training data y*And x*,
Coefficient a and b in linear equation, and then it can be concluded that full roll surface stiffness coefficient C are returned out according to least square method0=1/a and
Compensation rate G=b-P0/C0;
(2) when rolling new spec product, in passes second from the bottom, aluminium sheet head, middle part, tail portion are sampled respectively
Roll-force P2h、P2b、P2t;After the completion of passes second from the bottom, respectively with calliper to measure aluminium sheet head, middle part, tail portion
Thickness h2h、h2b、h2t, then calculating roll-force is P2aveWhen, mill modulus C2=((P2h-P2b)/(h2h-h2b)+(P2b-P2t)/
(h2b-h2t)+(P2t-P2h)/(h2t-h2h))/3, if C0-100<C2<C0, then it is assumed that the rigidity C currently calculated2Be it is reasonable,
THICKNESS CALCULATION can be put into;Otherwise transformation card amount position is needed, until meet the requirements, if repeatedly card amount is still unsatisfactory for requiring,
It need to be pressed against again and calculate full roll surface stiffness coefficient C0。
Further, extreme trace is removed secondly, it is initial setting roll gap that remaining passage, which all keeps roll gap,.
Further, Electro-pressing can only act under no-load condition, and only compensation is electric under no-load condition for hydraulic pressing
Dynamic roll gap.
Advantageous effects of the invention:
The method of the invention is more accurate to the calculating of thickness, and system operation is more steady.In roll gap adjustment, due to PI
The target value of controller is not directly equal to roll gap target value, but uses the ramp signal gradually side close to roll gap target value
Method, while curve processing is carried out to ramp signal.Can exist in this way to avoid conventional method due to inertia, make APC system dynamic
Make and stop the case where moment operation is unstable and there are overshoot generation.
In summary electronic and Combined hydraulic pressure location control means and inventive method, method proposed by the present invention are not required to
Increase new equipment, press down system locating speed and stability can be improved, meets operation of rolling needs.
Detailed description of the invention
Fig. 1 is that roll gap changes schematic diagram before and after slab enters milling train;
Wherein, ordinate S indicates that mill roll-gap, abscissa t indicate time, Δ SaIndicate slab during the rolling process flat
Equal roll gap;ΔSrIndicate setting roll gap;ΔSbIndicate the practical unloaded average roll gap before slab enters milling train;ΔSabIndicate electronic
The Bounce distance of pressure;ΔSrbIndicate Electro-pressing deviations;tinIndicate that slab enters the milling train moment;
Fig. 2 is roll-force P1And P2THICKNESS CALCULATION schematic diagram when close.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is explained in further detail.It should be appreciated that specific embodiment described herein is used only for explaining the present invention, and
It is not used in the restriction present invention.
On the contrary, the present invention covers any substitution done on the essence and scope of the present invention being defined by the claims, repairs
Change, equivalent method and scheme.Further, in order to make the public have a better understanding the present invention, below to of the invention thin
It is detailed to describe some specific detail sections in section description.Part without these details for a person skilled in the art
The present invention can also be understood completely in description.
The rolling of single chassis hot rolled plate have supplied materials is short, passage variation frequently, unloaded pressing speed is fast, sting steel impact greatly,
The features such as torsional oscillation is big and product variety specification is more, these features determine its AGC system means based on pressure AGC.
Although the form of expression multiplicity of pressure AGC, is all based on mill spring equation.Mill spring equation form is such as
Under:
H=S+ (P-P0)/C (1)
In formula, h display plate tape thickness, S and P respectively indicate mill roll-gap and roll-force, P0Indicate that pre- throw-on pressure, C indicate
Mill modulus.Mill modulus C is the closely related variable such as one and roll-force P, rolled piece width W, in same
During plate rolling, if ignoring the variation of roll wear and thermal expansion, it is believed that when roll-force P changes in small range
When, mill modulus C is approximately constant.
From spring formula it is found that if same slab during the rolling process, the thickness of two different locations, rolls roll gap
There are following relationships for power processed:
h1-h2=S1-S2+(P1-P2)/C (2)
Formula (2) is relative thickness calculation formula, and formula (1) is absolute thickness calculation formula.It will be apparent that according to relatively thick
Calculation formula is spent, if roll gap is constant, i.e. S1=S2=S0, then h1=h2+(P1-P2)/C;And according to absolute thickness calculation formula,
If roll gap is constant, as S0, then h1=S0+(P1-P0)/C.If P1And P2Relatively, it is deposited referring now to as stiffness coefficient C
In the case where certain error, the order of accuarcy of two kinds of thickness equations.
It is roll-force P in Fig. 21And P2THICKNESS CALCULATION schematic diagram when close, wherein ordinate P and h indicate roll-force and go out
Mouth thickness, abscissa t indicate the time, may make P by adjusting coordinate system0And h0Corresponding curve co-insides, P2And h2It is corresponding
Curve co-insides, and then P1And h10Corresponding curve co-insides.It is assumed that when calculated rigidity coefficient is 2 times of practical stiffness coefficient,
h11The thickness that corresponding curve expression is obtained with relative thickness calculation formula, h12Absolute thickness is used in corresponding curve expression
The thickness that calculation formula obtains, as shown in Fig. 2, in the case where roll gap is constant, if roll-force is P2When with a thickness of h2, rolling
Power is P0When with a thickness of h0, can be by Pan and Zoom coordinate system, so that P based on spring formula2And h2、P0And h0It weighs respectively
It closes, if stiffness coefficient C calculates accurate, rolling force curve P1Corresponding thickness curve h10Also it can be overlapped.It is assumed that just
It spends coefficient C and calculates inaccuracy, become actual 2 times, then the thickness curve for using relative thickness calculation formula to obtain is then for h11,
The thickness curve for using absolute thickness calculation formula to obtain is then for h12, h11Fall in h10And h2Middle position, and h12Fall in h10With
h0Middle position.Due under normal circumstances, P0Much smaller than roll-force P1And P2, therefore h11Compare h12Closer to actual thickness h10,
Therefore the thickness that relative thickness calculation calculates is more quasi-.
In terms of existing paper and patent, paper " Analysis of Positive Feedback Characteristics of Pressure AGC " (steel, 2007,42 (7): 51-
55) normal pressures AGC is analyzed, it is indicated that since mill modulus C and plasticity coefficient of rolled piece Q can not be obtained accurately,
There are positive feedback regions for pressure AGC, can not accomplish precise thickness control.Therefore, the present invention does not use traditional pressure AGC to calculate
Method, merely with the thought of spring equation, it is only necessary to the mill stiffness system near specific roll-force is used in calculated thickness deviation
Number C, and without using both in the control to thickness.
Embodiment 1
It is a kind of using electronic and hydraulic pressing rolled aluminum sheet mill method for controlling thickness, the described method comprises the following steps:
Step 1: adjusting the initial setting of roll gap, and most latter two passage prediction rolling force deviation is made to be less than 200KN;
Step 2: during passes second from the bottom, real-time accumulated roll gap, roll-force;
Step 3: it after the completion of passes second from the bottom, calculates passage slab second from the bottom and bites being averaged before milling train
Roll gap S2b, passage slab second from the bottom bite the average roll gap S after milling train2aIt is averaged roll-force P with passage second from the bottom2ave, obtain
Passage slab second from the bottom bites the Bounce distance Δ S of the electronic roll gap in front and back out2ab;
The passage slab second from the bottom bites the Bounce distance of the electronic roll gap in front and back: Δ S2ab=S2a-S2b。
Step 4: a mouthful thickness h is measured by manually blocking2, recalculate and obtain extreme trace time new settings roll gap S1r, allow execution machine
Structure acts in place;
Wherein, the setting roll gap S of the extreme trace time1rCalculation are as follows: S1r=S2b-h2+htarget, wherein h2It is artificial
Card amount exit thickness, htargetIndicate extreme trace time target thickness.
Step 5: in the extreme trace time operation of rolling, using mill spring equation, outlet thickness deviation Δ h is calculated in real time1,
And PI with parameter variation (PI) control is put into, to guarantee the thickness and precision of finished product aluminium sheet.
Wherein, the proportionality coefficient k of PI controllerpWith integral coefficient kiAccording to the exit thickness deviation delta h1It is different into
Row VARIABLE PARAMETER PID CONTROL, with exit thickness deviation delta h1Absolute value carries out stepping according to the section of 0.05mm within the scope of 0~1mm,
Proportionality coefficient kpThe adjusting controller speed of response, integral coefficient kiIntegration rate is adjusted, with the increase of thickness deviation absolute value, control
Device coefficient k processedpAnd kiAlso be gradually increased, to achieve the purpose that quickly to eliminate error, controller output quantity and integration amount will respectively into
The control of row clipping, clipping principle are that integration amount clipping is less than controller output quantity clipping, ordinary circumstance, controller output quantity clipping
For 1~1.5mm, integration amount clipping is 0.4~0.9 times of output quantity clipping.
In step 5, specifically: it is practical by comparing extreme trace time using mill spring equation in the extreme trace time operation of rolling
Roll-force P1It is averaged roll-force P with passage second from the bottom2aveDeviation and extreme trace time practical roll gap S1It is obtained with recalculating
Extreme trace time new settings roll gap S1rAnd the electronic roll gap Bounce distance Δ S of passage second from the bottom2abDeviation, calculate exit thickness in real time
Deviation delta h1, and variable parameters PI control is put into, to guarantee the thickness and precision of finished product aluminium sheet.
The exit thickness deviation delta h1=(S1-(S1r+ΔS2ab))+(P1-P2ave)/C2, C herein2Indicate in roll-force be
P2aveWhen mill modulus.
The mill modulus C2Calculation method include the following steps:
(1) the throw-on pressure P of acyclic homologically trioial process is pressed against in acquisition*With roll gap S*, the thickness of strip h that shuts out at this time*=0, mill stiffness
Meet spring formula:
H=S+ (P-P0)/C+Δ
In above-mentioned spring formula, h indicates that exit thickness, S indicate that roll gap, P indicate practical roll-force, P0It indicates pre- to be pressed against
Power, C indicate that roll-force is the mill modulus at P moment, and Δ indicates the sum of various compensation rates;
If respectively indicating dependent variable and independent variable with y and x, y=h-S, x=P, a=1/C, b=Δ-P are enabled0/ C is then full
The unitary once linear equation form of sufficient y=ax+b, utilizes the throw-on pressure P of acquisition*With roll gap S*Obtain training data y*And x*,
Coefficient a and b in linear equation, and then it can be concluded that full roll surface stiffness coefficient C are returned out according to least square method0=1/a and
Compensation rate Δ=b-P0/C0;
(2) when rolling new spec product, in passes second from the bottom, aluminium sheet head, middle part, tail portion are sampled respectively
Roll-force P2h、P2b、P2t;After the completion of passes second from the bottom, respectively with calliper to measure aluminium sheet head, middle part, tail portion
Thickness h2h、h2b、h2t, then can calculate roll-force is P2aveWhen, mill modulus C2=((P2h-P2b)/(h2h-h2b)+(P2b-
P2t)/(h2b-h2t)+(P2t-P2h)/(h2t-h2h))/3, if C0-100<C2<C0, then it is assumed that the rigidity C currently calculated2It is reasonable
, THICKNESS CALCULATION can be put into;Otherwise transformation card amount position is needed, until meet the requirements, if repeatedly card amount is still unsatisfactory for requiring,
It then needs to be pressed against again and calculates full roll surface stiffness coefficient C0.Except extreme trace secondly, it is initial setting roll gap that remaining passage, which all keeps roll gap,.
Claims (8)
1. a kind of using electronic and hydraulic pressing rolled aluminum sheet mill method for controlling thickness, which is characterized in that the method is based on
Spring equation, identical using adjacent passage roll-force, identical principle of bouncing can not depend on calibrator and to electronic and liquid
The single chassis rolled aluminum sheet mill of pressure pressure carries out accurate thickness prediction, and the accurate control of thickness is realized by closed-loop control,
Wherein, Electro-pressing can only act under no-load condition, and hydraulic pressing only compensates electronic roll gap under no-load condition,
Wherein, it the described method comprises the following steps:
Step 1: adjusting the initial setting of roll gap, and most latter two passage prediction rolling force deviation is made to be less than 200KN;
Step 2: during passes second from the bottom, real-time accumulated roll gap, roll-force;
Step 3: it after the completion of passes second from the bottom, first keeps passage roll gap second from the bottom constant, calculates road second from the bottom
Secondary slab bites the average roll gap S before milling train2b, passage slab second from the bottom bite the average roll gap S after milling train2aWith reciprocal the
Two passages are averaged roll-force P2ave, show that passage slab second from the bottom bites the Bounce distance Δ S of the electronic roll gap in front and back2ab;
Step 4: a mouthful thickness h is measured by manually blocking2, recalculate and obtain extreme trace time new settings roll gap S1r, and allow screw-down
This setting is executed, roll gap is made to reach S1r;
Step 5: in the extreme trace time operation of rolling, using mill spring equation, outlet thickness deviation Δ h is calculated in real time1, and put into
PI with parameter variation PI control, to guarantee the thickness and precision of finished product aluminium sheet.
2. a kind of using electronic and hydraulic pressing rolled aluminum sheet mill method for controlling thickness, feature according to claim 1
It is, in step 3, the passage slab second from the bottom bites the Bounce distance of the electronic roll gap in front and back: Δ S2ab=S2a-S2b。
3. method according to claim 1, which is characterized in that in step 4, recalculate the extreme trace time of acquisition
Set roll gap S1rCalculation are as follows: S1r=S2b-h2+htarget, wherein h2For people's work card amount exit thickness, htargetIndicate end
Passage target thickness.
4. a kind of using electronic and hydraulic pressing rolled aluminum sheet mill method for controlling thickness, feature according to claim 1
It is, in step 5, the proportionality coefficient k of PI controllerpWith integral coefficient kiAccording to the exit thickness deviation delta h1Difference,
VARIABLE PARAMETER PID CONTROL is carried out, i.e., to the exit thickness deviation delta h1Concourse Division is carried out, different thickness deviation segments is corresponding
Different kpAnd ki, segmentation principle is that the exit thickness deviation is bigger, controller proportionality coefficient kpWith integral coefficient kiTwo
Parameter is also bigger, and carries out clipping respectively to controller output quantity and integration amount, and integration amount clipping is controller output quantity limit
0.4~0.9 times of width.
5. a kind of using electronic and hydraulic pressing rolled aluminum sheet mill method for controlling thickness, feature according to claim 1
It is, in step 5, specifically: in the extreme trace time operation of rolling, using mill spring equation, by comparing the practical rolling of extreme trace time
Power P1It is averaged roll-force P with passage second from the bottom2aveDeviation and extreme trace time practical roll gap S1With the end for recalculating acquisition
Passage new settings roll gap S1rAnd the electronic roll gap Bounce distance Δ S of passage second from the bottom2abDeviation, in real time calculate outlet thickness deviation
Δh1, and variable parameters PI control is put into, to guarantee the thickness and precision of finished product aluminium sheet.
6. a kind of using electronic and hydraulic pressing rolled aluminum sheet mill method for controlling thickness, feature according to claim 1
It is, in step 5, the exit thickness deviation delta h1=(S1-(S1r+ΔS2ab))+(P1-P2ave)/C2, C herein2Expression is being rolled
Power processed is P2aveWhen mill modulus.
7. a kind of using electronic and hydraulic pressing rolled aluminum sheet mill method for controlling thickness, feature according to claim 6
It is, the mill modulus C2Calculation method include the following steps:
(1) the throw-on pressure P of acyclic homologically trioial process is pressed against in acquisition*With roll gap S*, the thickness of strip h that shuts out at this time*=0, mill stiffness meets
Bounce formula:
H=S+ (P-P0)/C+G
In above-mentioned formula, h indicates that exit thickness, S indicate that roll gap, P indicate practical roll-force, P0Indicate pre- throw-on pressure, C expression is rolled
Power processed is the mill modulus at P moment, and G indicates the sum of various compensation rates;
If respectively indicating dependent variable and independent variable with y and x, y=h-S, x=P, a=1/C, b=G-P are enabled0/ C, then meet y=
The unitary once linear equation form of ax+b, utilizes the throw-on pressure P of acquisition*With roll gap S*Obtain training data y*And x*, according to most
Small square law returns out coefficient a and b in linear equation, and then it can be concluded that full roll surface stiffness coefficient C0=1/a and compensation rate G
=b-P0/C0;
(2) when rolling new spec product, in passes second from the bottom, aluminium sheet head is sampled respectively, middle part, tail portion are rolled
Power P processed2h、P2b、P2t;After the completion of passes second from the bottom, respectively with the thickness on calliper to measure aluminium sheet head, middle part, tail portion
h2h、h2b、h2t, then calculating roll-force is P2aveWhen, mill modulus C2=((P2h-P2b)/(h2h-h2b)+(P2b-P2t)/
(h2b-h2t)+(P2t-P2h)/(h2t-h2h))/3, if C0-100<C2<C0, then it is assumed that the rigidity C currently calculated2Be it is reasonable,
Put into THICKNESS CALCULATION;Otherwise transformation card amount position is needed, until meeting the requirements, if repeatedly card amount is still unsatisfactory for requiring, needs weight
New be pressed against calculates full roll surface stiffness coefficient C0。
8. a kind of using electronic and hydraulic pressing rolled aluminum sheet mill method for controlling thickness, feature according to claim 1
It is, removes extreme trace secondly, it is initial setting roll gap that remaining passage, which all keeps roll gap,.
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CN107983780B (en) * | 2017-11-30 | 2019-07-05 | 中冶南方工程技术有限公司 | A kind of speed compensation method and system of Hot Rolling Process For High Temperature Alloy Plate machine hydraulic press down system |
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