CN108655182A - A kind of hot-strip production method of overall length thickness consecutive variations - Google Patents
A kind of hot-strip production method of overall length thickness consecutive variations Download PDFInfo
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- CN108655182A CN108655182A CN201710195644.4A CN201710195644A CN108655182A CN 108655182 A CN108655182 A CN 108655182A CN 201710195644 A CN201710195644 A CN 201710195644A CN 108655182 A CN108655182 A CN 108655182A
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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
- B21B37/24—Automatic variation of thickness according to a predetermined programme
- B21B37/26—Automatic variation of thickness according to a predetermined programme for obtaining one strip having successive lengths of different constant thickness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
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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
- B21B2261/043—Blanks with variable thickness in the rolling direction
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Abstract
The present invention is a kind of hot-strip production method of overall length thickness consecutive variations, the hot-strip of overall length thickness consecutive variations is by head, the section that thickens and tail portion composition, head, tail portion are respectively the identical uniform thickness section of thickness, and tail portion thickness is more than head thickness, it thickens between Duan Tou, tail portion, thickness is to be increased continuously from head thickness to tail portion thickness；Its production method includes：Set head thickness setting value, calculate each finishing stand of mm finishing mill unit initial roll gap and initial velocity and issue primary computer execution；Steel is stung in each rack completion, it is ensured that head thickness is head thickness setting value；Head length is controlled；Using Monitor Process uniform thickness feedback control is carried out according to head thickness setting value；To thickeing, segment length and thickeing controls；Length and thickness control are carried out to tail portion.The present invention has produced the change Deformation in thick of the overall length direction thickness consecutive variations of specific demand in the way of the feedback control target for changing Monitor Process in real time.
Description
Technical field
The present invention relates to the production methods of hot-strip, refer in particular to a kind of hot-strip life of overall length thickness consecutive variations
Production method.
Background technology
Most users are that the thickness fluctuation in requirement hot-strip overall length direction is small, and thickness is as uniform as possible, very
It is consecutive variations that rare user, which requires the thickness in hot-strip overall length direction, so conventional hot-strip production is all to control
For the purpose of strip overall length thickness is uniform.General hot rolling Continuous mill train is all with horizontal (the overall length thickness fluctuation of its thickness and precision
Standard deviation) come the Comprehensive Control level for weighing hot rolling producing line and advanced degree.
With social development, the demand of the hot-strip (referred to as becoming Deformation in thick) of overall length thickness consecutive variations occurs therewith.
The presently disclosed the relevant technologies for becoming Deformation in thick are mainly the method for concentrating on production on single chassis heavy and medium plate mill and becoming Deformation in thick
And do not have also to realize the relevant technologies of the stability of thickness transitions between different-thickness specification during similar endless rolling
Relate to the production or control of the hot-strip using traditional conventional hot continuous rolling machine unit production length direction thickness consecutive variations
The technology of method.
Conventional hot continuous rolling machine machine by second flow balance based on controlled, in conventional hot continuous rolling machine machine thicken rolling
Making other than being accurately controlled to roll gap also to the pressure of each rack roll gap or will lift speed between sequential, front and back rack
Degree matching and kink stability etc. are controlled.The process of thickeing will be avoided as possible because second flow imbalance is to rolling stability
It influences, so it is very big to carry out the accurate control difficulty that thickens in hot continuous rolling rack.On the other hand, it is limited by user demand
System, the application field for the hot-strip that thickens is very narrow, and most users require using strip in homogeneous thickness, so should
Development of the technology on traditional continuous hot-rolling mill is relatively slow.
Also occur the technology of related Varying-thickness rolling, example at present：
" length control method when a kind of Varying-thickness rolling " of Patent No. " CN201310315225.1 ", core skill
Art is that one kind of regular length and the amount of thickeing thickens length control realization method, and implementation step includes mainly：It is rolled thickeing
When system is not put into, measuring roller is counted as 0；When thickeing rolling input, the length of the rolled out band of measuring roller start recording, work
The action for making roller is as follows：When measured length reaches, working roll is pushed with certain pressing speed；When the length measured reaches
When, working roll position keeps no longer pressing down；When the length measured reaches, working roll is lifted with certain speed；When measuring
Length when reaching, working roll position keeps no longer up lifting；When the length measured reaches L1+L2+T1 × 2, measuring roller meter
Number is reset, and repeats preceding step.According to the present invention, the length measured by measuring roller, and the strip profile of reference settings, it is right
The depressing position of working roll is adjusted in real time, is a kind of very easy reliable length control method.
" method for controlling thickness of cold continuous rolling dynamic variable specification rolling and the control of Patent No. " CN201610286478.4 "
System processed ", core technology are that efficiently solve thickness and precision of cold continuous rolling during unstable state rolls with stable state
Stage processed have significance difference away from the technical issues of, ensure that unstable state process also has high-precision thickness, and then improve
The lumber recovery of ultrathin strip production process.Its method includes mainly：When detecting that dynamic variable specification point enters S1 racks, S1 is obtained
Strip thickness deviation at rack outlet；Judge that the strip thickness deviation at the S1 rack outlets is greater than or equal to default thickness
When poor permissible value, the strip thickness deviation discreet value in each downstream rack exit is estimated；Milling train based on the i-th downstream rack is rigid
Degree and strip are plastically deformed coefficient, calculate the i-th downstream rack for the i-th roll gap needed for respective strip thickness deviation discreet value
Regulated quantity；Before dynamic variable specification point enters the i-th downstream rack, the roll gap of the i-th downstream rack is adjusted based on the i-th adjustment amount of roll gap
Setting value.
But said program and technical scheme of the present invention are all different, and the present invention changes Monitor Process using real-time
The mode of feedback control target, by overall length belt steel thickness target accurately calculate and feedback control, produced special need
The change Deformation in thick for the overall length direction thickness consecutive variations asked.
Invention content
The purpose of the present invention is to solve problems of the existing technology, provide a kind of heat of overall length thickness consecutive variations
Roll strip production method.
The purpose of the present invention is what is be achieved through the following technical solutions：
A kind of hot-strip production method of overall length thickness consecutive variations, the hot-strip of the overall length thickness consecutive variations
By head, the section that thickens and tail portion composition, the head are the identical head uniform thickness section of thickness, and the tail portion is the identical tail of thickness
Portion's uniform thickness section, and tail portion thickness G T.GT.GT head thickness, the section that thickens are between head and tail portion, and thickness is from head thickness
It is increased continuously to tail portion thickness；Wherein, the production method comprises the steps of：
S1 sets the head thickness setting value for becoming Deformation in thick using process computer LEVEL2 models, according to head automatically
Thickness setting value calculates the initial roll gap and initial velocity of this 7 finishing stands of mm finishing mill unit F1-F7 automatically；
S2, after the completion of process computer LEVEL2 sets head thickness setting value, by the initial roll gap of each rack and initially
Speed issues primary computer LEVEL1 and executes；
S3, F1-F7 rack sting steel according to given initial roll gap and speed completion, it is ensured that become the head thickness h of Deformation in thick1
For head thickness setting value；
S4, to head length L1It is controlled；
S5 goes out the calculated heads Real-time Feedback LEVEL1 the length s of F7 racks1Differentiated；
S6, when judging s in step S51Less than required head length L1When, Monitor Process is according to head thickness setting value
Uniform thickness feedback control is carried out, Monitor Process actual measurement head goes out the thickness of F7 racks, as the head thickness h of actual measurement1Less than set
When head thickness setting value, F5-F7 racks start upper lift roll gap；On the contrary, as the head thickness h of actual measurement1More than set head
When portion's thickness setting value, F5-F7 racks start to push roll gap, until the head thickness h of actual measurement1Equal to set head thickness
When setting value, the stability contorting to head equal thickness section is realized；
S7, when judging s in step S51Equal to required head length L1When, the length control of head uniform thickness section terminates,
Into the segment length control that thickens；The length target for the section that thickens is according to the thickness of size of plate blank and finished product, width dimensions requirement, profit
It is calculated with constancy of volume principle；
Whether S8, the judgement section that thickens terminate, and the physical length control for the section that thickens goes out the length after F7 racks according to strip steel head
Degree tracking feedback is realized, if the section that thickens is not finished, continues back at above-mentioned steps S7；
S9, when thickeing, section has terminated, and the length that the strip that Real-time Feedback calculates goes out F7 racks subtracts head length L1Afterwards
Thicken section strip steel real time length s2Equal to the required segment length L that thickens2When, the segment length that thickens control and the control that thickens are completed, after
It is continuous that length and thickness control are carried out to tail portion；Complete the control that thickens of overall length strip.
In the step S1, process computer LEVEL2 models be according to the workpiece thickness of mm finishing mill unit entrance, width,
The sharing of load and head thickness h for each rack that temperature, implementation thicken1Head thickness setting value, wherein head is calculated
Thickness h1It is exactly required finished product head thickness, each roll is distributed by setting in the production process for realizing this thickness
The thickness of machine finally ensures that the strip finished product head thickness that last rack is shut out is equal to required head thickness h1。
In the step S4, it is real that head length controls the length tracking feedback after going out F7 racks according to the head for becoming Deformation in thick
Existing, F7 racks sting the tracking of strip length after steel, and (1) is calculated as follows：
s1=v0×t+v1×t+····+vn×t (1)
Wherein：
s1The strip steel head that thickens goes out the length (m) of F7 racks；
v0Initial velocity (m/s) is the strip threading speed of setting, value range 2-20m/s；
v1The speed (m/s) of-the 1 scan period, since going out after F7 racks strip steel head according to one it is fixed when
Between the interval delay last rack of acquisition in real time speed, the 1st scanning scan period referred to that the 1st fixed time interval delay obtains
The real-time speed data, v1Value range be 2-20m/s；
vnThe speed (m/s) of-the n-th scan period, since going out after F7 racks strip steel head according to one it is fixed when
Between the interval delay last rack of acquisition in real time speed, the n-th scan period referred to the speed of the F7 acquired after n-th of set time,
vnValue range be 2-20m/s；N is to go out F7 racks from strip to complete the last one required scan period number in real time；
The t- scan periods are constant；Scan period is exactly to obtain real time data according to fixed time interval delay,
It is constant, is 0.02 second.
In the step S7, the segment length that thickens L2Formula is calculated as follows to obtain：
Wherein：
H- slab thicknesses (m)；
W- width of plate slab (m)；
L- slab length (m)；
h1Head thickness (m)；
L1Head length (m)；
L2Thicken segment length (m)；
h3Tail portion thickness (m)；
L3Tail length (m)；
W1Finished product thickens strip width (m), the head, the section that thickens, the width all same of tail portion, on-demand required value.
In the step S8, F7 racks are stung shown in the tracking as the following formula of the later strip length of steel：
s2=v0×t+v1×t+····+vn×t-L1
Wherein：s2Thicken section strip steel real time length (m)；
v0Initial velocity (m/s)；
v1The speed (m/s) of-the 1 scan period, v1Value range be 2-20m/s；
vnThe speed (m/s) of-the n-th scan period；
The t- scan periods (s) are constant, generally take 0.02s；
L1Head length (m).
In the step S7-S8, section thickness that thickens need to be controlled, the thickness for the section that thickens meets in the segment length that thickens
L2Within carry out, the thickness of the section that thickens is from head thickness h1Continuously thicken to tail portion thickness h3, using in the segment length L that thickens2Range
Within, by way of becoming the target thickness of monitoring feedback AGC in real time, realized by the feedback of Monitor Process；Thicken a section Monitor Process
Thickness targets be a function, function characterization is thickness targets at section different location that thickens, is called the section that thickens
Real-time target thickness h2；According to the control length for the section that thickens and the absolute magnitude to thicken, the Monitor Process on per unit length is calculated
The thickness change of target thickness change rate, section Monitor Process that thickens is：
h2=h1+δ×s2
Wherein：δ-thickens a section target thickness change rate；
h2Thicken a section real-time target thickness (m)；
s2Thicken section strip steel real time length (m)；
L1Head length (m)；
L2Thicken segment length (m)；
h3Tail portion thickness (m)；
L3Tail length (m).
In the step S9, the length control of tail portion goes out the length tracking feedback realization after F7 racks according to strip steel head,
The following principle that F7 racks sting the later strip length of steel is as follows：
s3=v0×t+v1×t+····+vn×t-L1-L2
Wherein：s3Tail portion strip real time length (m)；
v0Initial velocity (m/s)；
v1The speed (m/s) of-the 1 scan period；
vnThe speed (m/s) of-the n-th scan period；
The t- scan periods (s) are constant, take 0.02s；
L1Head length (m)；
L2Thicken segment length (m)；
When the length that the strip that Real-time Feedback calculates goes out F7 racks subtracts head length L1And the segment length L that thickens2Tail portion afterwards
Strip real time length s3Equal to required tail length L3When, tail length control is completed, tail length control period, tail portion
The thickness control of uniform thickness section is realized using the feedback of Monitor Process, and Monitor Process actual measurement strip steel head goes out the thickness h of F7 racks, when
The thickness h of actual measurement is less than required tail portion thickness h3When, F5-F7 racks start upper lift roll gap；On the contrary, when the thickness h of actual measurement
More than required tail portion thickness h3When, F5-F7 racks start to push roll gap, until the actual measurement thickness h of tail portion is equal to required
Tail portion thickness h3When, the stability contorting to tail portion uniform thickness section is realized, at this point, completing the control that thickens of overall length strip.
Beneficial effects of the present invention：
The hot-strip production method of the overall length thickness consecutive variations of the present invention is to utilize the feedback for changing Monitor Process in real time
The mode of control targe, by overall length belt steel thickness target accurately calculate and feedback control, produced specific demand
The change Deformation in thick of overall length direction thickness consecutive variations.
A kind of hot-strip of a roll of gradual even variation of thickness from the beginning to the end can be produced, it can using the hot-strip
The gradual even variation oil well pipe of wall thickness is produced, hot-strip produced by the invention can subtract on the basis of taking into account steel strength
Few steel pipe own wt, saves the production and application cost of steel pipe.
For the above-mentioned purpose, design feature and effect further illustrated the present invention, below with reference to attached drawing to the present invention into
Row is described in detail.
Description of the drawings
Fig. 1 is the structural schematic diagram for becoming Deformation in thick；
Fig. 2 is to be changed into the change schematic diagram for becoming Deformation in thick from slab；
Fig. 3 is the flow diagram of the hot-strip production method of overall length thickness consecutive variations of the present invention.
Specific implementation mode
The specific implementation mode of the present invention is described in detail with reference to the attached drawing of embodiment.
The heat of overall length thickness consecutive variations described in the hot-strip production method of overall length thickness consecutive variations of the present invention
The structure of strip (hereinafter referred to as becoming Deformation in thick) is rolled referring to Fig. 1, and by head, the section that thickens and tail portion composition, the head is thickness
Spend identical head uniform thickness section, the tail portion is the identical tail portion uniform thickness section of thickness, and tail portion thickness G T.GT.GT head thickness, the change
Thick section is between head and tail portion, and thickness is to be increased continuously from head thickness to tail portion thickness.
Heretofore described production method is to change Monitor Process feedback target in real time to strip overall length, is realized as shown in Figure 2
Rectangular slab production become into overall length thickness be increased continuously the hot-strip of variation.
The flow of the hot-strip production method of overall length thickness consecutive variations of the present invention is as follows referring to Fig. 3：
S1, setting become the head thickness setting value of Deformation in thick.Head thickness setting value is to use process computer
(LEVEL2) model is set automatically, process computer model be according to the workpiece thickness of mm finishing mill unit entrance, width, temperature,
Implement the sharing of load and head thickness h of each rack to thicken1Head thickness setting value (wherein head thickness h is calculated1
It is exactly required finished product head thickness, but has to roll by the way that setting distribution is each in the production process for realizing this thickness
The thickness of machine finally ensures that the strip finished product head thickness that last rack is shut out is equal to required head thickness h1), according to head
Thickness setting value calculates the initial roll gap and initial velocity of this 7 finishing stands of mm finishing mill unit F1-F7 automatically.
S2, after the completion of process computer (LEVEL2) sets head thickness setting value, by the initial roll gap of each rack and just
Beginning speed issues primary computer (LEVEL1) execution.
S3, F1-F7 rack sting steel according to given initial roll gap and speed completion, it is ensured that become the head thickness h of Deformation in thick1
For head thickness setting value.
S4, to head length L1Control.Head length L1Depending on demand, head length L under normal circumstances1All compare
Short, the normal of section that do not influence to thicken after the main needs for considering user's welding and the excision of production process strip steel head defect makes
With.
Head length control goes out the length tracking feedback realization after F7 racks according to the head for becoming Deformation in thick, and F7 racks sting steel
(1) is calculated as follows for the tracking of later strip length：
s1=v0×t+v1×t+····+vn×t (1)
Wherein：
s1The strip steel head that thickens goes out the length (m) of F7 racks；
v0Initial velocity (m/s), the initial velocity be setting strip threading speed, be it is manually given, give according to
According to be mainly to ensure that strip steel head temperature can reach properties of product requirement temperature (relationship of threading speed and temperature is to pass through
What a series of models and formula were calculated, this is the prior art, according to the reality for the technique and equipment for designing product of the present invention
Situation, the v in the solution of the present invention0Initial velocity is as a given boundary condition, value range 2-20m/s)；
v1The speed (m/s) of-the 1 scan period, since going out after F7 racks strip steel head according to one it is fixed when
Between the interval delay last rack of acquisition in real time speed, the 1st scanning scan period referred to that the 1st fixed time interval delay obtains
The real-time speed data, v1Value range be 2-20m/s；
vnThe speed (m/s) of-the n-th scan period, since going out after F7 racks strip steel head according to one it is fixed when
Between the interval delay last rack of acquisition in real time speed, the n-th scan period referred to the speed of the F7 acquired after n-th of set time,
vnValue range be 2-20m/s；N is to go out F7 racks the last one scan period number required in real time from strip；
The t- scan periods are constant；Scan period is exactly to obtain real time data according to fixed time interval delay, this
One constant of a reaction time setting for being automatic control system integrated system response time and equipment, the period be usually
0.02 second (s).
S5, the length s that the strip steel head that thickens calculated to Real-time Feedback LEVEL1 goes out F7 racks differentiate.
S6, when judgement s is less than required head length L in step S51When, (Monitor Process is a kind of routine to Monitor Process
Control technology) according to head thickness setting value carry out uniform thickness feedback control, that is, the thickness control of head uniform thickness section utilizes monitoring
The feedback of AGC realizes that Monitor Process actual measurement head goes out the thickness of F7 racks, as the head thickness h of actual measurement1Less than set head
When portion's thickness setting value, F5-F7 racks start upper lift roll gap；On the contrary, as the head thickness h of actual measurement1More than set head
When thickness setting value, F5-F7 racks start to push roll gap, until the head thickness h of actual measurement1It is set equal to set head thickness
When definite value, the stability contorting to head equal thickness section is realized.
S7, when judgement s is equal to required head length L in step S51When, the length control of head uniform thickness section terminates；
Into the segment length control that thickens.The length control for the section that thickens and thickness control are core of the invention technologies, the length for the section that thickens
Target is calculated using constancy of volume principle, thicken section according to the thickness of size of plate blank and finished product, width dimensions requirement
Length L2It is that formula (2) is calculated as follows to obtain：
Wherein：
H- slab thicknesses (m)；
W- width of plate slab (m)；
L- slab length (m)；(H, W, L are known data)；
h1Head thickness (m)；
L1Head length (m)；
L2Thicken segment length (m)；
h3Tail portion thickness (m)；
L3Tail length (m)；
W1Finished product thickens strip width (m), finger portion, the section that thickens, of same size, the on-demand required value of tail portion.
Whether S8, the judgement section that thickens terminate, and the physical length control for the section that thickens goes out the length after F7 racks according to strip steel head
Degree tracking feedback realizes that F7 racks are stung after steel shown in the following principle such as formula (3) of strip length：
s2=v0×t+v1×t+····+vn×t-L1 (3)
Wherein：s2Thicken section strip steel real time length (m)；
v0Initial velocity (m/s)；
v1The speed (m/s) of-the 1 scan period, v1Value range be 2-20m/s；
vnThe speed (m/s) of-the n-th scan period；
The t- scan periods (s) are constant, generally take 0.02s；
L1Head length (m).
When thickeing, section is not finished, and continues back at above-mentioned steps S7.
In the step S7-S8, section thickness that thickens need to be controlled, the thickness for the section that thickens must satisfy in the section that thickens
Length L2Within carry out, the thickness of the section that thickens is from head thickness h1Continuously thicken to tail portion thickness h3, using in the segment length L that thickens2
Within range, by way of becoming the target thickness of monitoring feedback AGC in real time, realized by the feedback of Monitor Process.The section that thickens monitors
The thickness targets of AGC are a function, and what which characterized is the thickness targets at section different location that thickens, and is called and thickens
Section real-time target thickness h2.According to the control length for the section that thickens and the absolute magnitude to thicken, the prison on per unit length can be calculated
Control the target thickness change rate of AGC.
The thickness change of section Monitor Process of thickeing is：
(4)
h2=h1+δ×s2
Wherein：δ-thickens a section target thickness change rate；
h2Thicken a section real-time target thickness (m)；
s2Thicken section strip steel real time length (m)；
L1Head length (m)；
L2Thicken segment length (m)；
h3Tail portion thickness (m)；
L3Tail length (m)；)
S9, when thickeing, section has terminated, that is, when the length that the strip that Real-time Feedback calculates goes out F7 racks subtracts head length L1
The section strip steel real time length s that thickens afterwards2Equal to the required segment length L that thickens2When, the segment length that thickens control and thickeing has controlled
At continuing to carry out length and thickness control, tail length L to tail portion3It determines on demand, the length of ordinary circumstance lower tail uniform thickness section
Degree is all shorter, does not influence the section that thickens after the main needs for considering user's welding and the excision of production process tail part of band steel defect
Normal use.
The length control of tail portion goes out the length tracking feedback realization after F7 racks according to strip steel head, and F7 racks are stung after steel
The following principle of strip length is as follows：
s3=v0×t+v1×t+····+vn×t-L1-L2 (5)
Wherein：s3Tail portion strip real time length (m)；
v0Initial velocity (m/s)；
v1The speed (m/s) of-the 1 scan period；
vnThe speed (m/s) of-the n-th scan period；
The t- scan periods (s) are constant, generally take 0.02s；
L1Head length (m)；
L2Thicken segment length (m)；
When the length that the strip that Real-time Feedback calculates goes out F7 racks subtracts head length L1And the segment length L that thickens2Tail portion afterwards
Strip real time length s3Equal to required tail length L3When, tail length control is completed, tail length control period, tail portion
The control of uniform thickness section it is similar to the control of the uniform thickness section on head, the thickness control of tail portion uniform thickness section also with Monitor Process feedback
It realizes (Monitor Process is a kind of conventional ripe control technology), Monitor Process actual measurement strip steel head goes out the thickness h of F7 racks, works as reality
The thickness h of survey is less than required tail portion thickness h3When, F5-F7 racks start upper lift roll gap；On the contrary, when the thickness h of actual measurement is big
In required tail portion thickness h3When, F5-F7 racks start to push roll gap, until the actual measurement thickness h of tail portion is equal to required
Tail portion thickness h3When, realize the stability contorting to tail portion uniform thickness section.At this point, completing the control that thickens of overall length strip.
Embodiment：
H- slab thicknesses (m), W- width of plate slab (m), L- slab length (m), h1Head thickness (m), L1Head length
(m), L2Thicken segment length (m), h3Tail portion thickness (m), L3Tail length (m), W1Finished product thickens strip width (m).
Size of plate blank：H=230mm (0.230m)；L=10m；W=1300mm (1.300m)；
Finished size：h1=4.05mm (0.00405m)；L1=50m；L3=60m；h3=4.55mm (0.00455m)；W1
=1200mm (1.200m)；
(1) head roll gap is set
The setting of head thickness may insure the balance of second flow when threading, carried in this way using the setting of Level2 models
The stability of high threading.Level2 is according to the thickness requirement h of strip steel head1=4.05mm (0.00405m) carries out each rack in head
Initial roll gap and speed setup algorithm, after the completion of setting Level2 by head roll gap and speed issue Level1 execute.
(2) head uniform thickness section roll control
It is L that user, which requires the control length of head equal thickness section,1=50m, thickness h1=4.05mm (0.00405m)；So：
Head length is：L1=50m；
Head thickness setting value is：h1=4.05mm (0.00405m)；
After strip steel head goes out F7 racks, Level1 grades of computers calculate in real time measures the length that strip steel head goes out F7 racks
Degree, in head L1Within=50m, Monitor Process is according to h1The target of=4.05mm (0.00405m) carries out feedback control, works as actual measurement
When thickness is more than 4.05mm (0.00405m), F5-F7 racks push roll gap, on the contrary, when actual measurement thickness is less than 4.05mm
When (0.00405m), F5-F7 racks lift roll gap, finally ensure to survey thickness hit head thickness setting value.
(3) segment length that thickens control
According to size of plate blank and finished product thickness, width dimensions, using constancy of volume principle, the length for the section that thickens in the middle part of calculating
Degree, while the control length for the section that continuously thickend according to middle part and the absolute magnitude that thickens, Monitor Process on calculating per unit length
Target thickness change rate.
The length computation for the section that thickens is as follows：
After strip steel head goes out F7 racks, Level1 grades of computers calculate in real time measures the length that strip steel head goes out F7 racks
Degree, for middle part thickens section, the measured length of middle part subtracts head L1The length of=50m is calculated and is controlled.
(4) thicken a section thickness control
After the length for the section that thickens in the middle part of calculating, unit length direction can be calculated according to the amount of thickeing for the section that thickens
On thickness targets.
The thickness change of middle part Monitor Process is：
The target thickness function of middle part Monitor Process is：
h2=h1+δ×s2=4.05+1.066 × s2 (8)
Wherein s2--- ranging from 0-469 meters；
Middle part physical length calculates following (initial velocity v0=8m/s)：
s2=v0×t+v1×t+····+vn×t-L1=8t+v1t+····+vnt-50 (9)
By above-mentioned calculating and control, the feedback target value of Monitor Process on section per unit length that thickens can be calculated, it is real
During the control of border, the practical thickness of per unit length is made using the feedback function of AGC according to the tracking to strip steel head thickness
Degree reach target thickness, equally, within section 0-469 meters of range that thicken, Monitor Process according to different location different-thickness target
It is controlled, when surveying target thickness of the thickness more than the position, F5-F7 racks push roll gap, on the contrary, when actual measurement thickness is small
When the target thickness of the position, F5-F7 racks lift roll gap, final to realize that different location corresponds to different thickness, realize continuous
Thicken process.
(5) the length control of tail portion equal thickness section,
The length of required tail portion uniform thickness section is 60 meters, and thickness is 4.55mm (0.00455m), specific as follows：
The length of tail portion equal thickness section is：L3=60m；
The thickness of tail portion equal thickness：h3=4.55mm (0.00455m)；
The length control of tail portion equal thickness section goes out the length tracking feedback realization after F7 racks, F7 racks according to strip steel head
The following principle for stinging the later strip length of steel is as follows：
s3=v0×t+v1×t+····+vn×t-L1-L2 (10)
=8t+v1t+····+vnt-50-469
=8t+v1t+····+vnt-519
Wherein：s3--- tail portion uniform thickness segment length (m)；
v0--- initial velocity (m/s)；It is set as 8 meter per seconds；
v1--- the speed (m/s) of the 1st scan period；
vn--- the speed (m/s) of the n-th scan period；
T --- the scan period (s) is constant；
L1 --- head uniform thickness segment length (m)；
L2 --- middle part thickens segment length (m)；
When the strip that Real-time Feedback calculates goes out the length s of F7 racks3When requiring L3=60 meters equal to user, tail portion uniform thickness section
Length control terminate；
Similar to head uniform thickness section, the thickness control of tail portion uniform thickness section realizes (monitoring also with the feedback of Monitor Process
AGC is a kind of conventional ripe control technology), Monitor Process actual measurement strip steel head goes out the thickness h of F7 racks, when the thickness h of actual measurement
The tail portion thickness h required less than user3When=4.55mm (0.00455m), F5-F7 racks start roll gap of appearing on the stage；On the contrary, when real
The thickness h of survey is more than the tail portion thickness h that user requires3When=4.55mm (0.00455m), F5-F7 racks start to push roll gap,
Until the actual measurement thickness h of tail portion3The tail portion thickness h required equal to user3When=4.55mm (0.00455m), realize to tail portion etc.
The stability contorting of thickness section.
Those of ordinary skill in the art it should be appreciated that more than embodiment be intended merely to illustrate the present invention's
Purpose, and it is not used as limitation of the invention, as long as in the essential scope of the present invention, the change to embodiment described above
Change, modification will all be fallen in the scope of the claims of the present invention.
Claims (7)
1. a kind of hot-strip production method of overall length thickness consecutive variations, the hot-strips of the overall length thickness consecutive variations by
Head, the section that thickens and tail portion composition, the head are the identical head uniform thickness section of thickness, and the tail portion is the identical tail portion of thickness
Uniform thickness section, and tail portion thickness G T.GT.GT head thickness, the section that thickens are between head and tail portion, and thickness is to connect from head thickness
It is continuous to be incremented to tail portion thickness；It is characterized in that, the production method comprises the steps of：
S1 sets the head thickness setting value for becoming Deformation in thick using process computer LEVEL2 models, according to head thickness automatically
Setting value calculates the initial roll gap and initial velocity of this 7 finishing stands of mm finishing mill unit F1-F7 automatically；
S2, after the completion of process computer LEVEL2 sets head thickness setting value, by the initial roll gap and initial velocity of each rack
Primary computer LEVEL1 is issued to execute；
S3, F1-F7 rack sting steel according to given initial roll gap and speed completion, it is ensured that become the head thickness h of Deformation in thick1For head
Portion's thickness setting value；
S4, to head length L1It is controlled；
S5 goes out the calculated heads Real-time Feedback LEVEL1 the length s of F7 racks1Differentiated；
S6, when judging s in step S51Less than required head length L1When, Monitor Process is carried out according to head thickness setting value
Uniform thickness feedback control, Monitor Process actual measurement head goes out the thickness of F7 racks, as the head thickness h of actual measurement1Less than set head
When thickness setting value, F5-F7 racks start upper lift roll gap；On the contrary, as the head thickness h of actual measurement1It is thick more than set head
When spending setting value, F5-F7 racks start to push roll gap, until the head thickness h of actual measurement1It is set equal to set head thickness
When value, the stability contorting to head equal thickness section is realized；
S7, when judging s in step S51Equal to required head length L1When, the length control of head uniform thickness section terminates, and enters
The segment length that thickens control；The length target for the section that thickens is to utilize body according to the thickness of size of plate blank and finished product, width dimensions requirement
Product invariance principle is calculated；
Whether S8, the judgement section that thickens terminate, the physical length control of the section that thickens gone out according to strip steel head the length after F7 racks with
Track feedback is realized, if the section that thickens is not finished, continues back at above-mentioned steps S7；
S9, when thickeing, section has terminated, and the length that the strip that Real-time Feedback calculates goes out F7 racks subtracts head length L1The section that thickens afterwards
Strip real time length s2Equal to the required segment length L that thickens2When, the segment length that thickens control and the control that thickens are completed, and are continued to tail
Portion carries out length and thickness control；Complete the control that thickens of overall length strip.
2. the hot-strip production method of overall length thickness consecutive variations as described in claim 1, it is characterised in that：
In the step S1, process computer LEVEL2 models are the workpiece thickness, width, temperature according to mm finishing mill unit entrance
Degree, the sharing of load and head thickness h for implementing each rack to thicken1Head thickness setting value is calculated, wherein head is thick
Spend h1It is exactly required finished product head thickness, each milling train is distributed by setting in the production process for realizing this thickness
Thickness, finally ensure that strip finished product head thickness that last rack is shut out is equal to required head thickness h1。
3. the hot-strip production method of overall length thickness consecutive variations as described in claim 1, it is characterised in that：
In the step S4, head length control goes out the length tracking feedback realization after F7 racks according to the head for becoming Deformation in thick,
F7 racks sting the tracking of strip length after steel, and (1) is calculated as follows：
s1=v0×t+v1×t+····+vn×t (1)
Wherein：
s1The strip steel head that thickens goes out the length (m) of F7 racks；
v0Initial velocity (m/s) is the strip threading speed of setting, value range 2-20m/s；
v1The speed (m/s) of-the 1 scan period, according to a fixed time interval since going out after F7 racks strip steel head
The speed of the last rack of delay acquisition in real time, the 1st scanning scan period refer to that the 1st fixed time interval delay obtains this in real time
Speed data, v1Value range be 2-20m/s；
vnThe speed (m/s) of-the n-th scan period, according to a fixed time interval since going out after F7 racks strip steel head
The speed of the delay last rack of acquisition in real time, the n-th scan period refer to the speed of the F7 acquired after n-th of set time, vnTake
It is worth ranging from 2-20m/s；N is to go out F7 racks from strip to complete the last one required scan period number in real time；
The t- scan periods are constant；Scan period is exactly to obtain real time data according to fixed time interval delay, is normal
Amount is 0.02 second.
4. the hot-strip production method of overall length thickness consecutive variations as described in claim 1, it is characterised in that：
In the step S7, the segment length that thickens L2Formula is calculated as follows to obtain：
Wherein：
H- slab thicknesses (m)；
W- width of plate slab (m)；
L- slab length (m)；
h1Head thickness (m)；
L1Head length (m)；
L2Thicken segment length (m)；
h3Tail portion thickness (m)；
L3Tail length (m)；
W1Finished product thickens strip width (m), the head, the section that thickens, the width all same of tail portion, on-demand required value.
5. the hot-strip production method of overall length thickness consecutive variations as described in claim 1, it is characterised in that：
In the step S8, F7 racks are stung shown in the tracking as the following formula of the later strip length of steel：
s2=v0×t+v1×t+····+vn×t-L1
Wherein：s2Thicken section strip steel real time length (m)；
v0Initial velocity (m/s)；
v1The speed (m/s) of-the 1 scan period, v1Value range be 2-20m/s；
vnThe speed (m/s) of-the n-th scan period；
The t- scan periods (s) are constant, generally take 0.02s；
L1Head length (m).
6. the hot-strip production method of overall length thickness consecutive variations as described in claim 1, it is characterised in that：
In the step S7-S8, section thickness that thickens need to be controlled, the thickness for the section that thickens meets in the segment length L that thickens2With
Interior progress, the thickness of the section that thickens is from head thickness h1Continuously thicken to tail portion thickness h3, using in the segment length L that thickens2Range with
It is interior, by way of becoming the target thickness of monitoring feedback AGC in real time, realized by the feedback of Monitor Process；Thicken section Monitor Process
Thickness targets are a function, and what which characterized is the thickness targets at section different location that thickens, and are called the section reality that thickens
When target thickness h2；According to the control length for the section that thickens and the absolute magnitude to thicken, the mesh of the Monitor Process on per unit length is calculated
Thickness change is marked, the thickness change for section Monitor Process that thickens is：
h2=h1+δ×s2
Wherein：δ-thickens a section target thickness change rate；
h2Thicken a section real-time target thickness (m)；
s2Thicken section strip steel real time length (m)；
L1Head length (m)；
L2Thicken segment length (m)；
h3Tail portion thickness (m)；
L3Tail length (m).
7. the hot-strip production method of overall length thickness consecutive variations as described in claim 1, it is characterised in that：
In the step S9, the length control of tail portion goes out the length tracking feedback realization after F7 racks, F7 machines according to strip steel head
The following principle that frame stings the later strip length of steel is as follows：
s3=v0×t+v1×t+····+vn×t-L1-L2
Wherein：s3Tail portion strip real time length (m)；
v0Initial velocity (m/s)；
v1The speed (m/s) of-the 1 scan period；
vnThe speed (m/s) of-the n-th scan period；
The t- scan periods (s) are constant, take 0.02s；
L1Head length (m)；
L2Thicken segment length (m)；
When the length that the strip that Real-time Feedback calculates goes out F7 racks subtracts head length L1And the segment length L that thickens2Tail portion strip afterwards
Real time length s3Equal to required tail length L3When, tail length control is completed, tail length control period, tail portion uniform thickness
The thickness control of section is realized using the feedback of Monitor Process, and Monitor Process actual measurement strip steel head goes out the thickness h of F7 racks, works as actual measurement
Thickness h be less than required tail portion thickness h3When, F5-F7 racks start upper lift roll gap；On the contrary, when the thickness h of actual measurement is more than
Required tail portion thickness h3When, F5-F7 racks start to push roll gap, until the actual measurement thickness h of tail portion is equal to required tail
Portion's thickness h3When, the stability contorting to tail portion uniform thickness section is realized, at this point, completing the control that thickens of overall length strip.
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| CN110614274A (en) * | 2019-10-16 | 2019-12-27 | 中冶南方工程技术有限公司 | Improved second flow thickness control method for single-stand reversible rolling mill |
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| CN113578975A (en) * | 2021-07-21 | 2021-11-02 | 张家港扬子江冷轧板有限公司 | Method for emergency specification change of acid rolling mill |
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