CN102688899B - Control method of percentage elongation of double-stand temper mill - Google Patents
Control method of percentage elongation of double-stand temper mill Download PDFInfo
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- CN102688899B CN102688899B CN201110070294.1A CN201110070294A CN102688899B CN 102688899 B CN102688899 B CN 102688899B CN 201110070294 A CN201110070294 A CN 201110070294A CN 102688899 B CN102688899 B CN 102688899B
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Abstract
The invention discloses a control method of percentage elongation of a double-stand temper mill which is used for regulating and controlling the percentage elongation in the ultra-thin strip steel leveling process by tensile force; when the error between the total percentage elongation measured value of a 1# stand temper mill and a 2# stand temper mill and a total percentage elongation set value exceeds a given range, the 1# stand temper mill inlet tensile force regulating quantity, the regulating quantity of tensile force between stands, and the 2# stand temper mill outlet tensile force regulating quantity are respectively calculated and determined according to the error value of the percentage elongation; at the same time with the regulation and control of the percentage elongation based on the tensile force, the rolling force of the 1# stand temper mill is subjected to the corresponding feed-forward control compensation according to the 1# stand temper mill inlet tensile force regulating quantity and the regulating quantity of the tensile force between stands, and the rolling force of the 2# stand temper mill is subjected to the corresponding feed-forward control compensation according to the 2# stand temper mill inlet tensile force regulating quantity and the regulating quantity of the tensile force between stands. The percentage elongation control precision is enhanced by the invention, the strip steel tensile force and rolling force fluctuation in the closed-loop control of the percentage elongation is reduced, and the stability of the double-stands leveling process is enhanced.
Description
Technical field
The present invention relates to a kind of milling method of cold-strip steel, particularly Two-stand Temper Mill cold-rolled thin steel strip elongation controlling means.
Background technology
Cold rolling levelling is to being rolled with less plastic deformation (percentage elongation is generally 0.2%～3%) with steel after recrystallization annealing, to eliminate yield point elongation, control panel shape, and obtains the operation of rolling of surface topography requiring.No matter be traditional or modern cold-rolling process process, smooth one of the production link that is all absolutely necessary.Due to smooth be the belt plate shape, last procedure of mechanical performance that determines finished product, so the percentage elongation of planisher and plate shape are controlled, have very important significance for the quality that improves cold-strip steel.
Being one of important control function of planisher with the closed-loop control of steel percentage elongation, is the Main Means with steel mechanical performance and type quality after guarantee annealing.The main persevering elongation control of planisher (being percentage elongation closed-loop control) and two kinds of control modes of permanent draught pressure control (being draught pressure closed-loop control) at present.For the closed-loop control of planisher percentage elongation, when percentage elongation actual value departs from percentage elongation setting value, by adjusting skin pass rolling pressure or strip tension, make actual percentage elongation regressive object value.In general, for thinner thickness, the harder band steel of material, smooth percentage elongation is more responsive to warp tension ratio, conventionally adopts and adjusts tensionless mode control percentage elongation; The band steel thicker for thickness, material is softer, smooth percentage elongation is more responsive to roll-force, conventionally adopts and adjusts roll-force mode control percentage elongation.
Japan Patent JP05069019A has proposed a kind of single chassis planisher percentage elongation fuzzy control method, according to the deviation of percentage elongation measured value and percentage elongation setting value, by the fuzzy reasoning rule designing in advance, the gain of calculative determination drafts elongation control and the gain of tension force elongation control, correspondingly regulate skin pass rolling power or frame strip steel at entry tension force respectively.US Patent No. 4760723A has proposed a kind of singlestandmill elongation controlling means, according to the deviation of percentage elongation measured value and percentage elongation setting value, roll-force is regulated accordingly, meanwhile, regulate the impact on tension force in order to eliminate roll-force, according to the deviation of roll-force measured value and rolling force setup value, tension force is carried out to corresponding compensation and control.
Strip cold rolling mills rolling therory and practice show, in the belt steel flating operation of rolling, roll-force and tension force intercouple between the two, and roll-force changes and tends to cause tension fluctuation, otherwise tension variation also can cause roll-force fluctuation.In existing band steel Stand Mill is smooth, the general percentage elongation closed loop control method adopting is according to the deviation of the breaking elongation measured value of No. 1 frame planisher and No. 2 frame planishers and breaking elongation setting value, by regulating No. 1 planisher roll gap drafts (roll-force) to eliminate percentage elongation deviation.Good in order to ensure smooth rear surface quality and plate shape with steel, No. 2 frame adopts Constant dvaught pressure control conventionally.In existing planisher percentage elongation closed loop control method, owing to conventionally roll-force control and tension force control being designed to two separate controlling units, in the time that band steel Stand Mill formation process drops into percentage elongation closed-loop control, easily occur that strip tension, roll-force fluctuate widely, the problems such as elongation control precision is poor, particularly in smooth acceleration, moderating process, performance is more obvious.
Summary of the invention
The object of the present invention is to provide a kind of Two-stand Temper Mill elongation controlling means, this control method can improve paper-thin strip (refer generally to thickness and be less than 0.3mm) Two-stand Temper Mill elongation control precision, the fluctuation of strip tension, roll-force etc. while reducing percentage elongation closed-loop control, the stability of raising Stand Mill formation process.
To achieve these goals, the present invention adopts following technical scheme:
A kind of Two-stand Temper Mill elongation controlling means, the steps include:
1) configure respectively 1 cover tachymeter at No. 1 frame planisher entrance and No. 2 frame planisher outlets, for the examinations strip speed of position separately, as the input of percentage elongation detector;
Percentage elongation detector is output as:
In formula:
---No. 1 frame planisher strip steel at entry speed measured value
---No. 2 frame planisher outlet strip speed measured values
---belt steel flating percentage elongation measured value;
2) smooth percentage elongation measured value deducts percentage elongation setting value, obtains percentage elongation deviate:
In formula:
---percentage elongation deviate
---belt steel flating percentage elongation setting value, from unit process control computer L2, requires to determine according to Product Process;
3) percentage elongation feedback controller, according to the size of percentage elongation deviate, determines whether to need adjustment of tonicity or roll-force, that is:
In formula:
---percentage elongation closed-loop control threshold value,
, generally determine according to percentage elongation closed-loop control required precision;
4) adopt tension adjustment control for the percentage elongation in paper-thin strip formation process, in the time that the deviation of the breaking elongation measured value of No. 1 frame planisher and No. 2 frame planishers and breaking elongation setting value exceeds given range, according to the deviate of percentage elongation No. 1 frame planisher entrance tension adjustment amount of calculative determination, interstand tension regulated quantity and No. 2 frames outlet tension adjustment amounts respectively;
5), in by tension adjustment control percentage elongation, according to No. 1 frame planisher entrance tension adjustment amount and interstand tension regulated quantity, No. 1 frame planisher roll-force is carried out to corresponding FEEDFORWARD CONTROL compensation; According to interstand tension regulated quantity and No. 2 frame outlet tension adjustment amounts, No. 2 frame planisher roll-forces are carried out to corresponding FEEDFORWARD CONTROL compensation.
When No. 1 frame entrance tension force measured value, interstand tension measured value and No. 2 frame outlet tension force measured values reach the given upper limit separately simultaneously, and No. 1 frame entrance tension adjustment amount, interstand tension regulated quantity and No. 2 frame outlet tension adjustment amounts be on the occasion of time, do not carry out tension adjustment;
Or when No. 1 frame entrance tension force measured value, interstand tension measured value and No. 2 frame outlet tension force measured values reach given lower limit separately simultaneously, and when No. 1 frame entrance tension adjustment amount, interstand tension regulated quantity and No. 2 frame outlet tension adjustment amounts are negative value, do not carry out tension adjustment;
According to No. 1 frame planisher roll-force regulated quantity of deviate calculative determination of percentage elongation;
In regulating by No. 1 frame roll-force and controlling percentage elongation, according to No. 1 frame planisher roll-force regulated quantity, respectively No. 1 frame planisher entrance tension force and interstand tension are carried out to corresponding FEEDFORWARD CONTROL compensation.
The present invention is a kind of Two-stand Temper Mill percentage elongation closed loop control method, can improve paper-thin strip (refer generally to thickness and be less than 0.3mm) Two-stand Temper Mill elongation control precision, the fluctuation of strip tension, roll-force etc. while reducing percentage elongation closed-loop control, the stability of raising Stand Mill formation process.
Brief description of the drawings
Fig. 1 is the tension adjustment mode Two-stand Temper Mill elongation control functional schematic in the present invention.
Fig. 2 is the roll-force regulative mode Two-stand Temper Mill elongation control functional schematic in the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
One, percentage elongation detects
As depicted in figs. 1 and 2, in order to ensure the accuracy of detection of percentage elongation, configure respectively 1 cover tachymeter (generally adopting high-precision laser velocimeter) at No. 1 frame planisher entrance and No. 2 frame planisher outlets, for the examinations strip speed of position separately, as the input of percentage elongation detector.The reliability simultaneously detecting in order to ensure percentage elongation, on No. 1 frame planisher entrance jockey pulley, No. 2 frame planisher outlet jockey pulleys, configure respectively the high-resolution encoder of 1 cover, by detecting the rotating speed indirect detection strip speed of position separately of jockey pulley.Once tachymeter breaks down in production process, strip speed detection signal automatically switches to encoder by tachymeter.
The definition of Two-stand Temper Mill belt steel flating percentage elongation:
In formula:
---a certain section strip steel enters No. 1 frame length (being called for short smooth front length) before
---this section strip steel is the length (being called for short smooth rear length) after smooth through No. 1 planisher and No. 2 planishers
---the smooth percentage elongation of this section strip steel
Band steel width in formation process extends very little, negligible.To equal sign the right of above-mentioned percentage elongation formula up and down all divided by the time, can according to before smooth and smooth rear strip speed obtain smooth percentage elongation.As depicted in figs. 1 and 2, percentage elongation detector is output as:
In formula:
---No. 1 frame planisher strip steel at entry speed measured value
---No. 2 frame planisher outlet strip speed measured values
---belt steel flating percentage elongation measured value.
Two, percentage elongation deviation is determined
Smooth percentage elongation measured value deducts percentage elongation setting value, obtains percentage elongation deviate:
In formula:
---percentage elongation deviate
---belt steel flating percentage elongation setting value, from unit process control computer L2, requires to determine according to Product Process
As depicted in figs. 1 and 2, percentage elongation feedback controller, according to the size of percentage elongation deviate, determines whether to need adjustment of tonicity or roll-force, that is:
In formula:
---percentage elongation closed-loop control threshold value,
, generally determine according to percentage elongation closed-loop control required precision.
Three, tension adjustment amount is determined and output
Consider that in paper-thin strip formation process, adjustment of tonicity is more effective for controlling percentage elongation, in addition, in order to keep No. 1 frame planisher entrance and outlet Tension Difference (i.e. difference between No. 1 frame entrance tension force measured value and interstand tension measured value), No. 2 frame planisher entrances and outlet Tension Difference (be interstand tension measured value with No. 2 frames export tension force measured value and between difference) basicly stable, in the time that the deviation of the breaking elongation measured value of No. 1 frame planisher and No. 2 frame planishers and breaking elongation setting value exceeds given range, according to the deviate of percentage elongation No. 1 frame planisher entrance tension adjustment amount of calculative determination respectively, interstand tension regulated quantity and No. 2 frame outlet tension adjustment amounts, regulating action by three tension force of common performance to percentage elongation, reach and eliminate reposefully in time percentage elongation deviation, realize the object of high accuracy percentage elongation closed-loop control.
As depicted in figs. 1 and 2, No. 1 frame planisher speed is the reference speed of Two-stand Temper Mill group, carries out setup control by the main speed (MRH) that makes, and in percentage elongation closed-loop control, does not make adjustments.
As shown in Figure 1, percentage elongation feedback controller is according to percentage elongation deviate, and No. 1 frame planisher entrance tension adjustment amount of calculative determination, interstand tension regulated quantity and No. 2 frames export tension adjustment amounts respectively:
In formula:
---No. 1 frame planisher entrance tension adjustment amount
---No. 1 frame planisher entrance tension force ride gain
---No. 1 frame planisher entrance tension force
t 1to percentage elongation
einfluence coefficient,
(
---differential operator, below identical), be the function with steel matter, specification and flattening technological parameter etc., can calculate or test by theoretical model and obtain;
In formula:
---interstand tension regulated quantity
---interstand tension ride gain
---interstand tension
t 12to percentage elongation
einfluence coefficient,
, be the function with steel matter, specification and flattening technological parameter etc., can calculate or test by theoretical model and obtain;
In formula:
---No. 2 frame planisher outlet tension adjustment amounts
---No. 2 frame planisher outlet tension force ride gains
---No. 2 frame planisher outlet tension force
t 2to percentage elongation shadow
ering coefficient,
, be the function with steel matter, specification and flattening technological parameter etc., can calculate or test by theoretical model and obtain.
As shown in Figure 1, percentage elongation feedback controller, according to tension force measured value, tension adjustment amount, is comprehensively determined each tension force control export ratio coefficient by following control strategy:
In formula:
---No. 1 frame planisher entrance tension force control export ratio coefficient
---No. 1 frame planisher entrance tension force measured value
---No. 1 frame planisher entrance tension force measured value allows the upper limit
---No. 1 frame planisher entrance tension force measured value allows lower limit;
In formula:
---interstand tension control export ratio coefficient
---interstand tension measured value
---interstand tension measured value allows the upper limit
---interstand tension measured value allows lower limit;
In formula:
---No. 2 frame planisher outlet tension force control export ratio coefficients
---No. 2 frame planisher outlet tension force measured values
---No. 2 frame planisher outlet tension force measured value allows the upper limit
---No. 2 frame planisher outlet tension force measured value allows lower limit;
As shown in Figure 1, percentage elongation feedback controller is multiplied by tension adjustment amount after tension force control export ratio coefficient, outputs to corresponding tension controller:
?。
Four, roll-force compensation rate is determined
In by tension adjustment control percentage elongation, in order to reduce roll-force fluctuation that tension adjustment causes, to keep two frame roll-forces basicly stable, according to No. 1 frame planisher entrance tension adjustment amount and interstand tension regulated quantity, No. 1 frame planisher roll-force is carried out to corresponding FEEDFORWARD CONTROL compensation; According to interstand tension regulated quantity and No. 2 frame outlet tension adjustment amounts, No. 2 frame planisher roll-forces are carried out to corresponding FEEDFORWARD CONTROL compensation.
As shown in Figure 1, tension force, is determined and exports frame planisher roll-force FEEDFORWARD CONTROL compensation rate No. 1 according to No. 1 frame planisher entrance tension adjustment amount and interstand tension regulated quantity roll-force feedforward controller 1:
In formula:
---No. 1 frame planisher roll-force FEEDFORWARD CONTROL compensation rate
---No. 1 frame roll-force FEEDFORWARD CONTROL gain coefficient
---No. 1 frame entrance tension force
t 1to No. 1 frame roll-force
p 1influence coefficient,
---No. 1 frame roll-force
p 1to percentage elongation
einfluence coefficient,
, be the function with steel matter, specification and flattening technological parameter etc., can calculate or test by theoretical model and obtain
---interstand tension
t 12to No. 1 frame roll-force
p 1influence coefficient,
;
As shown in Figure 1, tension force, is determined and exports frame planisher roll-force FEEDFORWARD CONTROL compensation rate No. 2 according to interstand tension regulated quantity and No. 2 frame planishers outlet tension adjustment amounts roll-force feedforward controller 2:
In formula:
---No. 2 frame roll-force FEEDFORWARD CONTROL compensation rates
---No. 2 frame roll-force FEEDFORWARD CONTROL gain coefficients
---interstand tension
t 12to No. 2 frame roll-forces
p 2influence coefficient,
---No. 2 frame roll-forces
p 2to percentage elongation
einfluence coefficient,
, be the function with steel matter, specification and flattening technological parameter etc., can calculate or test by theoretical model and obtain
---No. 2 frame outlet tension force
t 2to No. 2 frame roll-forces
p 2influence coefficient,
.
Five, roll-force regulated quantity is determined and output
When No. 1 frame entrance tension force measured value, interstand tension measured value and No. 2 frames outlet tension force measured values reach the given upper limit separately simultaneously, and No. 1 frame entrance tension adjustment amount, interstand tension regulated quantity and No. 2 frame outlet tension adjustment amounts be on the occasion of time; Or when No. 1 frame entrance tension force measured value, interstand tension measured value and No. 2 frame outlet tension force measured values reach given lower limit separately simultaneously, and when No. 1 frame entrance tension adjustment amount, interstand tension regulated quantity and No. 2 frame outlet tension adjustment amounts are negative value, do not carry out tension adjustment.According to No. 1 frame planisher roll-force regulated quantity of deviate calculative determination of percentage elongation, by regulating frame roll-force No. 1, reach the object of eliminating percentage elongation deviation, realizing percentage elongation closed-loop control.
As shown in Figure 2, percentage elongation feedback controller is according to percentage elongation deviate, No. 1 frame planisher roll-force regulated quantity of calculative determination:
In formula:
---No. 1 frame roll-force regulated quantity
---No. 1 frame roll-force ride gain
---No. 1 frame roll-force is to percentage elongation influence coefficient
As shown in Figure 2, percentage elongation feedback controller, according to No. 1 frame rolling measured value, roll-force regulated quantity, is determined frame roll-force control export ratio coefficient No. 1:
In formula:
---No. 1 frame planisher roll-force control export ratio coefficient,
---No. 1 frame planisher roll-force measured value
---No. 1 frame planisher roll-force measured value allows the upper limit
---No. 1 frame planisher roll-force measured value allows lower limit;
As shown in Figure 2, percentage elongation feedback controller is multiplied by roll-force regulated quantity after roll-force control export ratio coefficient, No. 1 planisher roll-force controller outputing to:
。
Six, tension compensating amount is determined
In regulating control percentage elongation by No. 1 frame roll-force, regulate the tension fluctuation, the maintenance tension force that cause basicly stable in order to reduce roll-force, according to No. 1 frame planisher roll-force regulated quantity, respectively No. 1 frame planisher entrance tension force and interstand tension are carried out to corresponding FEEDFORWARD CONTROL compensation.
As shown in Figure 2, roll-force, is determined and exports frame planisher entrance tension force FEEDFORWARD CONTROL compensation rate No. 1 according to No. 1 frame planisher roll-force regulated quantity tension force feedforward controller 1:
In formula:
---No. 1 frame planisher entrance tension force FEEDFORWARD CONTROL compensation rate
---No. 1 frame tension force FEEDFORWARD CONTROL gain coefficient
---No. 1 frame roll-force
p 1to No. 1 frame entrance tension force
t 1influence coefficient,
As shown in Figure 2, roll-force, is determined and exports interstand tension FEEDFORWARD CONTROL compensation rate according to No. 1 frame planisher roll-force regulated quantity tension force feedforward controller 2:
In formula:
---interstand tension FEEDFORWARD CONTROL compensation rate
---interstand tension FEEDFORWARD CONTROL gain coefficient
---No. 1 frame roll-force
p 1to interstand tension
t 12influence coefficient,
.
These are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention, therefore, all any amendments of doing within the spirit and principles in the present invention, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (5)
1. a Two-stand Temper Mill elongation controlling means, is characterized in that, the steps include:
1) configure respectively 1 cover tachymeter at No. 1 frame planisher entrance and No. 2 frame planisher outlets, for the examinations strip speed of position separately, as the input of percentage elongation detector;
Percentage elongation detector is output as:
In formula: V
1---No. 1 frame planisher strip steel at entry speed measured value
V
3---No. 2 frame planisher outlet strip speed measured values
ε
act---belt steel flating percentage elongation measured value;
2) smooth percentage elongation measured value deducts percentage elongation setting value, obtains percentage elongation deviate:
Δε＝ε
act-ε
ref
In formula: Δ ε---percentage elongation deviate
ε
ref---belt steel flating percentage elongation setting value, from unit process control computer L2, requires to determine according to Product Process;
3) percentage elongation feedback controller, according to the size of percentage elongation deviate, determines whether to need adjustment of tonicity or roll-force, that is:
When | Δ ε |>=Δ ε
limtime, adjustment of tonicity or roll-force;
When | Δ ε | < Δ ε
limtime, not adjustment of tonicity and roll-force
In formula: Δ ε
lim---percentage elongation closed-loop control threshold value, Δ ε
lim>0, determines according to percentage elongation closed-loop control required precision;
4) adopt tension adjustment control for the percentage elongation in paper-thin strip formation process, in the time that the deviation of the breaking elongation measured value of No. 1 frame planisher and No. 2 frame planishers and breaking elongation setting value exceeds given range, according to the deviate of percentage elongation No. 1 frame planisher entrance tension adjustment amount of calculative determination, interstand tension regulated quantity and No. 2 frames outlet tension adjustment amounts respectively;
5), in by tension adjustment control percentage elongation, according to No. 1 frame planisher entrance tension adjustment amount and interstand tension regulated quantity, No. 1 frame planisher roll-force is carried out to corresponding FEEDFORWARD CONTROL compensation; According to interstand tension regulated quantity and No. 2 frame outlet tension adjustment amounts, No. 2 frame planisher roll-forces are carried out to corresponding FEEDFORWARD CONTROL compensation;
In step 4) in, percentage elongation feedback controller is according to percentage elongation deviate, and No. 1 frame planisher entrance tension adjustment amount of calculative determination, interstand tension regulated quantity and No. 2 frames export tension adjustment amounts respectively:
ΔT
1_ε＝Gain
T1_ε×Δε/K
T1_ε
In formula: Δ T
1_ ε---No. 1 frame planisher entrance tension adjustment amount
Gain
t1_ ε---No. 1 frame planisher entrance tension force ride gain
K
t1_ ε---No. 1 frame planisher entrance tension force T
1to percentage elongation ε influence coefficient,
wherein
---differential operator, below identical, be the function with steel matter, specification and flattening technological parameter, calculate or test by theoretical model and obtain;
ΔT
12_ε＝Gain
T12_ε×Δε/K
T12_ε
In formula: Δ T
12_ ε---interstand tension regulated quantity
Gain
t12_ ε---interstand tension ride gain
K
t12_ ε---interstand tension T
12to percentage elongation ε influence coefficient,
be the function with steel matter, specification and flattening technological parameter, calculate or test by theoretical model and obtain;
ΔT
2_ε＝Gain
T2_ε×Δε/K
T2_ε
In formula: Δ T
2_ ε---No. 2 frame planisher outlet tension adjustment amounts
Gain
t2_ ε---No. 2 frame planisher outlet tension force ride gains
K
t2_ ε---No. 2 frame planisher outlet tension force T
2to percentage elongation ε influence coefficient,
be the function with steel matter, specification and flattening technological parameter, calculate or test by theoretical model and obtain;
Percentage elongation feedback controller, according to tension force measured value, tension adjustment amount, is comprehensively determined each tension force control export ratio coefficient by following control strategy:
In formula: Ratio
t1_ ε---No. 1 frame planisher entrance tension force control export ratio coefficient
T
1_act---No. 1 frame planisher entrance tension force measured value
T
1_upp---No. 1 frame planisher entrance tension force measured value allows the upper limit
T
1_low---No. 1 frame planisher entrance tension force measured value allows lower limit
In formula: Ratio
t12_ ε---interstand tension control export ratio coefficient
T
12_act---interstand tension measured value
T
12_upp---interstand tension measured value allows the upper limit
T
12_low---interstand tension measured value allows lower limit
In formula: Ratio
t2_ ε---No. 2 frame planisher outlet tension force control export ratio coefficients
T
2_act---No. 2 frame planisher outlet tension force measured values
T
2_upp---No. 2 frame planisher outlet tension force measured value allows the upper limit
T
2_low---No. 2 frame planisher outlet tension force measured value allows lower limit
Ratio
T1_ε+Ratio
T12_ε+Ratio
T2_ε≤1.0
Ratio
T1_ε≥0
Ratio
T12_ε≥0
Ratio
T2_ε≥0
Percentage elongation feedback controller is multiplied by tension adjustment amount after tension force control export ratio coefficient, outputs to corresponding tension controller:
。
2. Two-stand Temper Mill elongation controlling means according to claim 1, it is characterized in that: in step 5) in, roll-force feedforward controller 1 is according to No. 1 frame planisher entrance tension adjustment amount and interstand tension regulated quantity, determines and exports frame planisher roll-force FEEDFORWARD CONTROL compensation rate No. 1:
ΔP
1_T＝Gain
P1_T×(K
T1_P1×ΔT
1_ε+K
T12_P1×ΔT
12_ε)
In formula: Δ P
1_T---No. 1 frame planisher roll-force FEEDFORWARD CONTROL compensation rate
Gain
p1_T---No. 1 frame roll-force FEEDFORWARD CONTROL gain coefficient
K
t1_P1---No. 1 frame entrance tension force T
1to No. 1 frame roll-force P
1influence coefficient,
K
p1_ ε---No. 1 frame roll-force P
1to percentage elongation ε influence coefficient,
be the function with steel matter, specification and flattening technological parameter, calculate or test by theoretical model and obtain
K
t12_P1---interstand tension T
12to No. 1 frame roll-force P
1influence coefficient,
Roll-force feedforward controller 2 is according to interstand tension regulated quantity and No. 2 frame planishers outlet tension adjustment amounts, determines and exports frame planisher roll-force FEEDFORWARD CONTROL compensation rate No. 2:
ΔP
2_T＝Gain
P2_T×(K
T12_P2×ΔT
12_ε+K
T2_P2×ΔT
2_ε)
In formula: Δ P
2_T---No. 2 frame roll-force FEEDFORWARD CONTROL compensation rates
Gain
p2_T---No. 2 frame roll-force FEEDFORWARD CONTROL gain coefficients
K
t12_P2---interstand tension T
12to No. 2 frame roll-force P
2influence coefficient,
K
p2_ ε---No. 2 frame roll-force P
2to percentage elongation ε influence coefficient,
be the function with steel matter, specification and flattening technological parameter, calculate or test by theoretical model and obtain
K
t2_P2---No. 2 frame outlet tension force T
2to No. 2 frame roll-force P
2influence coefficient,
。
3. a Two-stand Temper Mill elongation controlling means, is characterized in that, the steps include:
1) configure respectively 1 cover tachymeter at No. 1 frame planisher entrance and No. 2 frame planisher outlets, for the examinations strip speed of position separately, as the input of percentage elongation detector;
Percentage elongation detector is output as:
In formula: V
1---No. 1 frame planisher strip steel at entry speed measured value
V
3---No. 2 frame planisher outlet strip speed measured values
ε
act---belt steel flating percentage elongation measured value;
2) smooth percentage elongation measured value deducts percentage elongation setting value, obtains percentage elongation deviate:
Δε＝ε
act-ε
ref
In formula: Δ ε---percentage elongation deviate
ε
ref---belt steel flating percentage elongation setting value, from unit process control computer L2, requires to determine according to Product Process;
3) percentage elongation feedback controller, according to the size of percentage elongation deviate, determines whether to need adjustment of tonicity or roll-force, that is:
When | Δ ε |>=Δ ε
limtime, adjustment of tonicity or roll-force;
When | Δ ε | < Δ ε
limtime, not adjustment of tonicity and roll-force
In formula: Δ ε
lim---percentage elongation closed-loop control threshold value, Δ ε
lim>0, determines according to percentage elongation closed-loop control required precision;
4) adopt tension adjustment control for the percentage elongation in paper-thin strip formation process, in the time that the deviation of the breaking elongation measured value of No. 1 frame planisher and No. 2 frame planishers and breaking elongation setting value exceeds given range, according to the deviate of percentage elongation No. 1 frame planisher entrance tension adjustment amount of calculative determination, interstand tension regulated quantity and No. 2 frames outlet tension adjustment amounts respectively;
5), in by tension adjustment control percentage elongation, according to No. 1 frame planisher entrance tension adjustment amount and interstand tension regulated quantity, No. 1 frame planisher roll-force is carried out to corresponding FEEDFORWARD CONTROL compensation; According to interstand tension regulated quantity and No. 2 frame outlet tension adjustment amounts, No. 2 frame planisher roll-forces are carried out to corresponding FEEDFORWARD CONTROL compensation;
When No. 1 frame entrance tension force measured value, interstand tension measured value and No. 2 frame outlet tension force measured values reach the given upper limit separately simultaneously, and No. 1 frame entrance tension adjustment amount, interstand tension regulated quantity and No. 2 frame outlet tension adjustment amounts be on the occasion of time, do not carry out tension adjustment;
Or when No. 1 frame entrance tension force measured value, interstand tension measured value and No. 2 frame outlet tension force measured values reach given lower limit separately simultaneously, and when No. 1 frame entrance tension adjustment amount, interstand tension regulated quantity and No. 2 frame outlet tension adjustment amounts are negative value, do not carry out tension adjustment;
According to No. 1 frame planisher roll-force regulated quantity of deviate calculative determination of percentage elongation;
In regulating by No. 1 frame roll-force and controlling percentage elongation, according to No. 1 frame planisher roll-force regulated quantity, respectively No. 1 frame planisher entrance tension force and interstand tension are carried out to corresponding FEEDFORWARD CONTROL compensation.
4. Two-stand Temper Mill elongation controlling means according to claim 3, is characterized in that: percentage elongation feedback controller is according to percentage elongation deviate, No. 1 frame planisher roll-force regulated quantity of calculative determination:
ΔP
1_ε＝Gain
P1_ε×Δε/K
P1_ε
In formula: Δ P
1_ ε---No. 1 frame roll-force regulated quantity
Gain
p1_ ε---No. 1 frame roll-force ride gain
K
p1_ ε---No. 1 frame roll-force is to percentage elongation influence coefficient
Percentage elongation feedback controller, according to No. 1 frame rolling measured value, roll-force regulated quantity, is determined frame roll-force control export ratio coefficient No. 1:
In formula: Ratio
p1_ ε---No. 1 frame planisher roll-force control export ratio coefficient, 0≤Ratio
p1_ ε≤ 1.0
P
1_act---No. 1 frame planisher roll-force measured value
P
1_upp---No. 1 frame planisher roll-force measured value allows the upper limit
P
1_low---No. 1 frame planisher roll-force measured value allows lower limit;
Percentage elongation feedback controller is multiplied by No. 1 frame planisher roll-force regulated quantity after No. 1 frame roll-force control export ratio coefficient, outputs to planisher roll-force controller No. 1:
Ratio
p1_ ε× Δ P
1_ ε→ No. 1 planisher roll-force controller.
5. Two-stand Temper Mill elongation controlling means according to claim 4, is characterized in that: roll-force, is determined and exports frame planisher entrance tension force FEEDFORWARD CONTROL compensation rate No. 1 according to No. 1 frame planisher roll-force regulated quantity tension force feedforward controller 1:
ΔT
1_P1＝Gain
T1_P1×K
P1_T1×ΔP
1_ε
In formula: Δ T
1_P1---No. 1 frame planisher entrance tension force FEEDFORWARD CONTROL compensation rate
Gain
t1_P1---No. 1 frame tension force FEEDFORWARD CONTROL gain coefficient
K
p1_T1---No. 1 frame roll-force P
1to No. 1 frame entrance tension force T
1influence coefficient,
Roll-force, is determined and exports interstand tension FEEDFORWARD CONTROL compensation rate according to No. 1 frame planisher roll-force regulated quantity tension force feedforward controller 2:
ΔT
12_P1＝Gain
T12_P1×K
P1_T12×ΔP
1_ε
In formula: Δ T
12_P1---interstand tension FEEDFORWARD CONTROL compensation rate
Gain
t12_P1---interstand tension FEEDFORWARD CONTROL gain coefficient
K
p1_T12---No. 1 frame roll-force P
1to interstand tension T
12influence coefficient,
.
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| CN102873106B (en) * | 2012-09-29 | 2014-12-03 | 鞍钢股份有限公司 | Quick and precise elongation control method for temper mill |
| CN103076778A (en) * | 2012-12-27 | 2013-05-01 | 鞍钢集团自动化公司 | Dynamic distribution and automatic control system for cold-rolling hydrochloric acid pickling line outlet ductility |
| CN104525580B (en) * | 2014-12-05 | 2017-02-01 | 北京首钢冷轧薄板有限公司 | Cold rolling flat elongation controlling system and method |
| CN105251780B (en) * | 2015-11-11 | 2017-05-03 | 首钢总公司 | Control method for ductility fluctuation of temper mill |
| CN105414201B (en) * | 2015-12-10 | 2017-11-03 | 安徽马钢自动化信息技术有限公司 | A kind of method of elongation percentage control accuracy during raising polishing machine acceleration and deceleration |
| CN107900144B (en) * | 2017-11-20 | 2019-06-07 | 武汉科技大学 | A kind of elongation percentage composite control method of the online planisher of pickling |
| CN112139255B (en) * | 2019-06-27 | 2022-06-14 | 上海梅山钢铁股份有限公司 | Elongation rate control method for double-frame wet temper mill |
| CN110385340B (en) * | 2019-07-26 | 2020-07-24 | 首钢集团有限公司 | Rolling method and device of double-stand temper mill |
| CN112718877A (en) * | 2019-10-14 | 2021-04-30 | 上海宝信软件股份有限公司 | Automatic optimization system and method for temper mill rolling force meter |
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| CN104492823A (en) * | 2014-12-22 | 2015-04-08 | 中冶南方（武汉）自动化有限公司 | Method for obtaining constant elongation in states of acceleration and deceleration |
| CN104492823B (en) * | 2014-12-22 | 2016-08-31 | 中冶南方（武汉）自动化有限公司 | A kind of method obtaining constant elongation percentage under acceleration and deceleration state |
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