CN107042240B - A kind of high precision plate strip rolling process dynamic variable specification implementation method based on feature point tracking - Google Patents
A kind of high precision plate strip rolling process dynamic variable specification implementation method based on feature point tracking Download PDFInfo
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- CN107042240B CN107042240B CN201710117515.3A CN201710117515A CN107042240B CN 107042240 B CN107042240 B CN 107042240B CN 201710117515 A CN201710117515 A CN 201710117515A CN 107042240 B CN107042240 B CN 107042240B
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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
- B21B37/18—Automatic gauge control
- B21B37/20—Automatic gauge control in tandem mills
Abstract
A kind of high precision plate strip rolling process dynamic variable specification implementation method based on feature point tracking disclosed by the invention, the division in tandem strip mill process weld seam wedge rolling area is refined, it is divided into before weld seam the dynamic variable specification stage after dynamic variable specification stage, weld metal zone rolling sequence and weld seam, according to the difference of different phase rolling parameter target set point, the accurate dynamic variable specification process for controlling board rolling.The method of the present invention only needs just realize under the conditions of software programming, and the investment in cost is not needed, pass through the high-precision control to dynamic variable specification process, strip thickness control accuracy, reduction Out-gauge length and the stability for improving the operation of rolling end to end can be increased substantially, can be widely popularized in board rolling factory.
Description
Technical field
The invention belongs to operation of rolling automatic control technology field, in particular to a kind of high-precision based on feature point tracking
Plate strip rolling process dynamic variable specification implementation method.It is related to Patent classificating number B21 substantially without the metal machining of cutting；Gold
The rolling B21B37/00 for belonging to punching press B21B metal is specially adapted for rolling mill for metal or the control equipment or method of its converted products
B21B37/16 thickness, width, diameter or other lateral dimensions control B21B37/18 automatically rule control B21B37/20 even
In milling train.
Background technique
During cold strip tandem, steel grade, thickness or the width of adjacent two coiled strip steel are generally realized by dynamic variable specification
Spend the transformation of equal-specification.The most important task of dynamic variable specification is exactly to guarantee product thickness precision in the case where strip constantly band
With overproof length.During dynamic variable specification, the setting values such as roll gap, roller speed of each rack will with the movement of tapered region and gradually
Variation, to cause its tension fluctuation between the rack of front and back.In order to not interfere with the variation of these setup parameters as far as possible
The stable rolling of front and back band steel, traditionally by the setting value of two coiled strips of the given front and back of process computer, by Basic automation level
Thickness, tension dispatch control system implement the variation of setting value step by step.But due in the operation of rolling operating status of milling train with
Setting state is not fully consistent, along with the stable rolling problem etc. for not considering position while welding, all finally affects entire change
The stability of specification process band thickness control accuracy end to end, overproof length and tension.
Summary of the invention
For deficiency existing for existing method, the present invention proposes a kind of high precision strip rolling mistake based on feature point tracking
Journey dynamic variable specification implementation method, includes the following steps:
- calculate and select two coiled strip steel dynamic declension intermediate settings value P of front and back in the operation of rollingI,i；
- dynamic variable specification initial point position is defined, it is risen by calculating the dynamic variable specification in real time to steel band rate integrating
Become specification factor alpha before the distance L of the 1st frame central line of the start distance operation of rolling, weld seam1And become specification factor alpha after weld seam2；
- according to the value range of current calculated distance L, the 1st rack operation of rolling is divided into the weldering of the 1st rack
The dynamic variable specification stage after dynamic variable specification stage, weld metal zone rolling sequence and weld seam before stitching；
As the distance L < 0, in the dynamic variable specification stage before the 1st rack weld seam, become specification coefficient before weld seam at this time
α11, i.e. 0 < α are increased to by 01< 1 becomes specification factor alpha after weld seam2It remains unchanged, numerical value 1 is calculated by following formula
Become specification factor alpha before to weld seam1:
α1=(Lw,1+C1+C2)/C1
Lw,1For weld seam to the distance of the 1st frame central line, m；C2=0.1m, C1=0.3~0.5m；
As calculating α1When >=1, the dynamic variable specification stage terminates before weld seam, starts weld metal zone rolling sequence, the stage roll gap
And speed remains unchanged, which originates in the position 0.1m before weld seam, ends at the position 0.1m after weld seam；
Become specification factor alpha after the weld seam2When being reduced by 1 to 0, become specification factor alpha before weld seam at this time1It remains unchanged, number
Value is 1, shows to be currently at the dynamic variable specification stage after weld seam, at this point, becoming specification factor alpha after weld seam2Pass through following formula meter
It obtains:
α2=(C1-Lw,1+C3)/C1
In formula, C3=0.1m, after weld seam when the dynamic variable specification stage, the 1st rack fixed value of roller slit becomes by a weld seam
Specification is transitioned into next the 1st rack setting value of coiled strip steel roll gap, and the 1st rack fixed value of roller slit is as follows；
SR1=(1- α2)S(n+1),1+α2SI,1
Wherein, SR1For the 1st rack fixed value of roller slit, S(n+1),1For next the 1st rack setting value of coiled strip steel roll gap, n is volume
The number of material, i.e. the n-th coiled strip steel；SI,1Become specification intermediate settings value for the 1st rack dynamical roll gap；
C1To become specification initial position before weld seam；C2Initial position, C are rolled for weld metal zone3For dynamic variable specification knot after weld seam
Beam position；
- the rack operation of rolling each in the entire operation of rolling is divided into dynamic variable specification stage, weld metal zone before weld seam
The dynamic variable specification stage after rolling sequence and weld seam, according to the previous rack dynamic variable specification stage, adjust latter rack with it is previous
Tension between rack realizes the dynamic variable specification in the operation of rolling.
As preferred embodiment, the change specification intermediate settings value PI,iIt includes at least: each rack roll gap, machine
Tension, milling train exit thickness and advancing slip value between frame；
PI,i=(P(n),i+P(n+1),i)/2
In formula, PI,iBecome specification intermediate settings value, P for the i-th rack(n),iFor current the i-th rack of coiled strip steel setting value,
P(n+1),iFor next the i-th rack of coiled strip steel setting value.
As preferred embodiment, the distance L calculating process is as follows:
L=L0-Lw,0-C1
In formula, L is distance of the dynamic variable specification starting point to the 1st rack of the operation of rolling, L0For inlet of rolling mill region overall length
Degree, Lw,0For the distance of welding seam distance inlet of rolling mill region initial position, which is accumulated by the speed to inlet of rolling mill region
Point, it is corrected using inlet of rolling mill welding seam detector, obtains the distance of welding seam distance inlet of rolling mill region initial position, calculating side
Method is shown below, C1=0.3~0.5m；
In formula, LbFor the distance of the previous adjacent area initial position of welding seam distance, m；LbfFor previous adjacent area total length,
m；L0For inlet of rolling mill region total length, m；Lw,1For the distance of the 1st frame central line of welding seam distance, m；VeFor current region strip
The speed of service, m/s.
As preferred embodiment, when the 1st rack dynamic variable specification, the 1st breast roller speed is adjusted:
1st breast roller speed and the 1st rack it is advancing slip value, the 2nd rack is advancing slip value, the 2nd rack entrance actual (real) thickness and go out
Mouth setting thickness is related, and adjustable parameter only has the 1st advancing slip value of rack, advancing slip value f hereR1Calculation method such as following formula institute
Show,
fR1=(1- α1)f(n),1+α1fI,1；
Wherein, fR1For the 1st advancing slip value of rack, f(n),1For current the 1st advancing slip setting value of rack of coiled strip steel, n is the volume of coiled material
Number, i.e. the n-th coiled strip steel；fI,1For the advancing slip change specification intermediate settings value of the 1st rack.
As preferred embodiment, after the 1st rack is in weld seam when the dynamic variable specification stage, the 1st machine is adjusted
Value that frame roll is advancing slip:
fR1=(1- α2)f(n+1),1+α2fI,1
Wherein, fI,1Indicate the advancing slip change specification intermediate settings value of the 1st rack, f(n+1),1Indicate that coiled strip steel is advancing slip under the 1st rack
Setting value.
Before as preferred embodiment, before the 2nd rack weld seam, the dynamic variable specification stage starts, calculate according to the following formula
Obtained initial point position judges whether the 2nd rack starts to execute dynamic variable specification；
In formula, t is time, V2For the 2nd rack outlet strip speed, L1,2The distance between 1,2 racks, i.e. in two rollers
The distance of heart line, formula indicates that the 1st rack becomes specification starting point and reaches the 2nd rack entrance, thus the change specification of the 2nd rack of triggering
Process；When the 1st rack, which becomes specification starting point, reaches 2 rack, dynamic variable specification starts before the 2nd rack weld seam.
Further, before the 2nd rack weld seam in dynamic variable specification phase process, tension needs transition between 1-2 rack
To last volume strip tension setting value；
In the dynamic variable specification stage before the 2nd rack weld seam, tension target value is rolling of calculating in step 1 between 1-2 rack
Two coiled strip steel dynamic variable specification intermediate settings values of selected front and back, 1-2 interstand tension preset value calculation method are as follows during system
Shown in formula,
TR,1-2=(1- α1)T(n),1-2+α1TI,1-2
Wherein, TR,1-2For 1-2 interstand tension setting value, T(n),1-2Tension is set between current coiled strip steel 1-2 rack
Value, TI,1-2Tension becomes specification intermediate settings value between 1-2 rack；
Meanwhile the 2nd breast roller speed is adjusted, that is, adjust the 2nd advancing slip value of rack, calculation method such as following formula institute
Show,
fR2=(1- α1)f(n),2+α1fI,2。
Wherein, fR2For the 2nd advancing slip value of rack, f(n),2For the advancing slip setting value of advancing slip 2nd rack of current coiled strip steel, n is coiled material
Number, i.e. the n-th coiled strip steel；fI,2For the advancing slip change specification intermediate settings value of the 2nd rack.
Further, after the 2nd rack weld seam in the dynamic variable specification stage, the 2nd rack roll gap target value, calculation method is such as
Shown in formula (14)；Tension target value between 1-2 rack, shown in calculation method such as formula (15)；Advancing slip target value, calculation method such as formula
(16) shown in,
SR2=(1- α2)S(n+1),2+α2SI,2 (14)
TR,1-2=(1- α2)T(n+1),1-2+α2TI,1-2 (15)
fR2=(1- α2)f(n+1),2+α2fI,2 (16)
Wherein, SR2For the 2nd rack fixed value of roller slit, S(n+1),2For next the 2nd rack setting value of coiled strip steel roll gap, n is volume
The number of material, i.e. the n-th coiled strip steel；SI,2Become specification intermediate settings value for the 2nd rack dynamical roll gap；
TR,1-2For 1-2 interstand tension setting value, T(n+1),1-2The tension setting value between next coiled strip steel 1-2 rack,
TI,1-2Tension becomes specification median between 1-2 rack；
fR2For the 2nd advancing slip value of rack, fI,2For the advancing slip change specification intermediate settings value of the 2nd rack, f(n+1),2Indicate the 2nd rack
The lower advancing slip setting value of coiled strip steel.
By using above-mentioned technical proposal, a kind of high precision strip rolling mistake based on feature point tracking disclosed by the invention
Journey dynamic variable specification implementation method has refined the division in tandem strip mill process weld seam wedge rolling area, that is, is divided into dynamic before weld seam
The dynamic variable specification stage after change specification stage, weld metal zone rolling sequence and weld seam, according to different phase rolling parameter goal-setting
The difference of value, the accurate dynamic variable specification process for controlling board rolling.The method of the present invention only needs under the conditions of software programming just
It can easily realize, and not need the investment in cost, it, can be significantly by the high-precision control to dynamic variable specification process
Strip thickness control accuracy, reduction Out-gauge length and the stability for improving the operation of rolling end to end are improved, can be widely popularized
Into board rolling factory.
Detailed description of the invention
For the clearer technical solution for illustrating the embodiment of the present invention or the prior art, to embodiment or will show below
There is attached drawing needed in technical description to do one simply to introduce, it should be apparent that, the accompanying drawings in the following description is only
Some embodiments of the present invention without creative efforts, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Fig. 1 is a kind of high precision plate strip rolling process dynamic variable specification implementation method based on feature point tracking of the present invention
Dynamic variable specification starting point tracks schematic diagram；
Fig. 2 is a kind of high precision plate strip rolling process dynamic variable specification implementation method based on feature point tracking of the present invention
Become specification slope schematic diagram before and after weld seam；
Fig. 3 is a kind of high precision plate strip rolling process dynamic variable specification implementation method based on feature point tracking of the present invention
The first to 5 racks become specification schematic diagram；
Fig. 4 is a kind of high precision plate strip rolling process dynamic variable specification implementation method based on feature point tracking of the present invention
Method flow diagram.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples, as Figure 1-Figure 4:
Step 1: dynamic variable specification intermediate settings value calculates.
Process control computer according to the rolling schedule calculation dynamic variable specification intermediate settings parameter of two coiled strip steel of front and back,
The setup parameter includes each rack roll gap, interstand tension, milling train exit thickness and advancing slip value, calculating side
Shown in method such as formula (1).
PI,i=(P(n),i+P(n+1),i)/2 (1)
In formula, PI,iBecome specification intermediate settings value, P for the i-th rack(n),iFor current the i-th rack of coiled strip steel setting value,
P(n+1),iFor next the i-th rack of coiled strip steel setting value.
Step 2: the tracking of dynamic variable specification starting point.
Dynamic variable specification initial point position is typically defined in (0.3~0.5) m before weld seam, as shown in Figure 1, by strip
The integral of speed calculates starting point to the distance of the 1st frame central line in real time.As shown in formula (2).
L=L0-Lw,0-C1 (2)
In formula, L is distance of the dynamic variable specification starting point to the 1st frame central line, L0For inlet of rolling mill region total length,
Lw,0For the distance of welding seam distance inlet of rolling mill region initial position, which is integrated by the speed to inlet of rolling mill region,
It is corrected using inlet of rolling mill welding seam detector, obtains the distance of welding seam distance inlet of rolling mill region initial position, calculation method
As shown in formula (3), C1=0.3~0.5m.
In formula, LbFor the distance of the previous adjacent area initial position of welding seam distance, m；LbfFor previous adjacent area total length,
m；L0For inlet of rolling mill region total length, m；Lw,1For the distance of the 1st frame central line of welding seam distance, m；VeFor current region strip
The speed of service, m/s.
Step 3: dynamic variable specification before the 1st rack weld seam.
Judge whether the 1st rack starts to execute dynamic variable specification according to the initial point position calculated in step 2.
When starting point arrival the 1st rack of milling train, i.e. L < 0, the 1st rack roll gap and the 1st breast roller speed are before weld seam
Become specification slope and adjust the change specification intermediate settings value calculated into step 1, becomes the calculation method such as formula on specification slope before weld seam
(4) shown in.
After change specification starts before weld seam, becoming specification slope with the movement of weld seam, before weld seam becomes 1 from 0, as shown in Figure 2.
α1=(Lw,1+C1+C2)/C1 (4)
In formula, Lw,1For weld seam to the distance of the 1st frame central line, m；C2=0.1m.Dynamically become rule before 1st rack weld seam
When the lattice stage, roll gap target value is that the roll gap calculated in step 1 becomes specification intermediate settings value, and setup parameter changes in order to prevent
It is larger, select the 1st rack roll gap value of feedback as current set value, as shown in formula (5), while by the 1st rack roll gap correction amount
It resets.Shown in 1st rack fixed value of roller slit such as formula (6).
SI,1=(Sact,1+S(n+1),1)/2 (5)
SR1=(1- α1)S(n),1+α1SI,1 (6)
In order to guarantee preceding material Quality of Tail, tension is remained unchanged between 1-2 rack when the 1st rack becomes specification, while in order to
So that the variation of roll gap is not interfered with the stable rolling of strip as far as possible, needs that the 1st breast roller speed is adjusted.1st machine
The frame speed of rolls and the advancing slip value of the 1st rack, the 2nd rack is advancing slip, and value, the 2nd rack entrance actual (real) thickness and outlet setting thickness have
It closes, adjustable parameter only has the 1st advancing slip value of rack here, shown in advancing slip calculation method such as formula (7).
fR1=(1- α1)f(n),1+α1fI,1 (7)
Step 4: the rolling of the 1st rack weld metal zone.According to the α calculated in step 31Judge dynamic variable specification state before weld seam,
Work as α1When >=1, the dynamic variable specification stage terminates before weld seam, as shown in Figure 2.In order to guarantee the stable rolling of position while welding, crosses and weld
Seam stage roll gap and speed remain unchanged, which originates in the position 0.1m before weld seam, end at the position 0.1m after weld seam.
Step 5: dynamic variable specification after the 1st rack weld seam.1st rack roll gap and the 1st breast roller speed become before weld seam
Specification slope is adjusted to intermediate settings value, and the dynamic variable specification stage after weld seam is entered after step 4.It is oblique to become specification after weld seam
Shown in the calculating on slope such as formula (8).After change specification starts after weld seam, become specification slope with the movement of weld seam, after weld seam is become from 1
0, as shown in Figure 2.
α2=(C1-Lw,1+C3)/C1 (8)
In formula, C3=0.1m.After weld seam when dynamic variable specification, the 1st rack fixed value of roller slit is that next coiled strip steel roll gap is set
Definite value, shown in the 1st rack fixed value of roller slit such as formula (9).C1To become specification initial position before weld seam；C2It rolls and originates for weld metal zone
Position, C3For dynamic variable specification end position after weld seam.
SR1=(1- α2)S(n+1),1+α2SI,1 (9)
Wherein, SR1For the 1st rack fixed value of roller slit, S(n+1),1For next the 1st rack setting value of coiled strip steel roll gap, n is volume
The number of material, i.e. the n-th coiled strip steel；SI,1Become specification intermediate settings value for the 1st rack dynamical roll gap；In order to guarantee preceding material head matter
Amount, tension remains unchanged between 1-2 rack when the 1st rack becomes specification, while in order to not interfere with the variation of roll gap as far as possible
The stable rolling of strip needs that the 1st breast roller speed is adjusted.By step 3 it is found that adjustable parameter only has
Value that 1 rack is advancing slip, shown in calculation method such as formula (10).
fR1=(1- α2)f(n+1),1+α2fI,1 (10)
Wherein, fI,1Indicate the advancing slip change specification intermediate settings value of the 1st rack, f(n+1),1Indicate that coiled strip steel is advancing slip under the 1st rack
Setting value.
Step 6: dynamic variable specification before the 2nd rack weld seam.The 1st rack is judged according to the initial point position calculated in step 2
Whether start to execute dynamic variable specification, when the 1st rack starts dynamic variable specification, using the strip speed between the first -2 rack
The initial point position is tracked, as shown in formula (11).
When the 1st rack, which becomes specification starting point, reaches 2 rack, dynamic variable specification starts before the 2nd rack weld seam.
The change procedure of 2nd rack roll gap is identical as the 1st rack roll gap change procedure in step 3.
For material head quality after guaranteeing, tension needs to be transitioned into last volume strip tension setting value between 1-2 rack.
In the dynamic variable specification stage before the 2nd rack weld seam, tension target value is rolling of calculating in step 1 between 1-2 rack
Two coiled strip steel dynamic variable specification intermediate settings values of selected front and back, 1-2 interstand tension preset value calculation method such as formula during system
(12) shown in.
TR,1-2=(1- α1)T(n),1-2+α1TI,1-2 (12)
Wherein, TR,1-2For 1-2 interstand tension setting value, T(n),1-2Tension is set between current coiled strip steel 1-2 rack
Value, TI,1-2Tension becomes specification intermediate settings value between 1-2 rack；
Meanwhile in order to make the variation of roll gap not interfere with the stable rolling of strip as far as possible, need to the 2nd breast roller speed
Degree is adjusted.By step 3 it is found that adjustable parameter only has the 2nd advancing slip value of rack, shown in calculation method such as formula (13).
fR2=(1- α1)f(n),2+α1fI,2 (13)
Wherein, fR2For the 2nd advancing slip value of rack, f(n),2For the advancing slip setting value of advancing slip 2nd rack of current coiled strip steel, n is coiled material
Number, i.e. the n-th coiled strip steel；fI,2For the advancing slip change specification intermediate settings value of the 2nd rack.
Step 7: the rolling of the 2nd rack weld metal zone.It is identical as step 4.
Step 8: dynamic variable specification after the 2nd rack weld seam.
Become specification starting point after the trigger timing of change specification is the 1st rack weld seam after 2nd rack weld seam and reach the 2nd rack,
Shown in the calculating process such as formula (8) on this time-varying specification slope.
2nd rack roll gap target value is next coiled strip steel fixed value of roller slit, shown in calculation method such as formula (14)；1-2 rack
Between tension target value be last volume strip tension setting value, shown in calculation method such as formula (15)；Advancing slip target value is next winding
Setting value that steel is advancing slip, shown in calculation method such as formula (16).
SR2=(1- α2)S(n+1),2+α2SI,2 (14)
TR,1-2=(1- α2)T(n+1),1-2+α2TI,1-2 (15)
fR2=(1- α2)f(n+1),2+α2fI,2 (16)
Wherein, SR2For the 2nd rack fixed value of roller slit, S(n+1),2For next the 2nd rack setting value of coiled strip steel roll gap, n is volume
The number of material, i.e. the n-th coiled strip steel；SI,2Become specification intermediate settings value for the 2nd rack dynamical roll gap；
TR,1-2For 1-2 interstand tension setting value, T(n+1),1-2The tension setting value between next coiled strip steel 1-2 rack,
TI,1-2Tension becomes specification median between 1-2 rack；
fR2For the 2nd advancing slip value of rack, fI,2For the advancing slip change specification intermediate settings value of the 2nd rack, f(n+1),2Indicate the 2nd rack
The lower advancing slip setting value of coiled strip steel.
Step 9: repeating step 6-8, complete the dynamic variable specification process of 3-5 rack, as shown in Figure 3.
Embodiment
In the present embodiment, certain 1450mm pickling tandem mills, the production line tandem mills form is five racks complete six
Roller, single chassis maximum rolling force are 20000kN, and muzzle velocity highest 1350m/min, basic automation systems are by three sets based on west
The core controller composition of the sub- TDC of door.
Preceding coiled strip steel specification: rolling steel grade MRT-3, supplied materials width 888mm, supplied materials thickness 2.0mm, exit thickness 0.22mm
Coiled strip steel specification afterwards: rolling steel grade MRT-3, supplied materials width 862mm, supplied materials thickness 1.8mm, exit thickness 0.19mm
A kind of high precision plate strip rolling process dynamic variable specification implementation method based on feature point tracking of the present embodiment is such as schemed
Shown in 4, comprising the following steps:
Step 1: two coiled strip steel PDI data entry process of front and back being controlled into computer, calculates rolling procedure.Setting becomes specification
Constant C1=0.3m, C2=0.1m, C3=0.1m.
Step 2: basic automation systems are connected by Industrial Ethernet with process control computer, are read in and are stored front and back
Two coiled strip steel rolling procedures.Intermediate settings value is calculated according to rolling procedure and sensor Real-time Feedback value,
Step 3: milling train muzzle velocity is 220mpm when setting dynamic variable specification, then inlet of rolling mill speed is 24.2mpm, rolls
The 1st rack 7.3m of machine entrance welding seam detector distance, when welding seam detector detects weld seam, system automatically sets position while welding
It is set to the 1st rack 7.3m of distance, the 1st rack 6.9m of this time-varying specification starting point distance.
Step 4: seam tracking system calculates position while welding according to strip steel at entry speed in real time, when weld seam reaches the 1st rack
Start to execute when at preceding 0.4m and become specification process, understand the calculation method of setting value for convenience, before reaching the 1st rack with weld seam
It is illustrated at 0.3m, becomes specification slope before the weld seam calculated at this time are as follows:
According to the intermediate settings value that rolling procedure and step 2 calculate, the weld seam setting value of the 1st rack finally calculated is with before
Sliding setting value are as follows:
SR1=(1- α1)S(n),1+α1SI,1=(1-0.333) × 2.661+0.333 × 2.700=2.674mm
fR1=(1- α1)f(n),1+α1fI,1=(1-0.333) × 5.370+0.333 × 5.442=5.394
Milling train basic automation systems adjust Position of Hydraulic Cylinder and speed of rolls setting value according to the setting value of above-mentioned calculating,
To complete dynamic variable specification process before weld seam.With the forward movement of weld seam, α1It becomes larger until to 1, at this time weld pitch
From the 1st rack 0.1m.The weld seam setting value and advancing slip setting value of the 1st rack calculated are as follows:
SR1=(1- α1)S(n),1+α1SI,1=(1-1) × 2.661+1 × 2.700=2.700mm
fR1=(1- α1)f(n),1+α1fI,1=(1-1) × 5.370+1 × 5.442=5.442
According to the above results, it can be seen that, mill roll-gap and advancing slip be transitioned among change specification from preceding coiled strip steel setting value are set
Definite value.
Step 5: according to the α calculated in above-mentioned steps1Judge dynamic variable specification state before weld seam, works as α1When >=1, before weld seam
Dynamic variable specification terminates, and in order to guarantee the stable rolling of position while welding, crosses weld seam stage roll gap and speed remains unchanged,
Step 6: to become specification starting point after weld seam at 0.1m after weld seam, when the point enters milling train, the 1st rack starts to weld
Become specification after seam.In order to facilitate the calculation method for understanding setting value, it is illustrated so that 0.2m after weld seam enters milling train as an example, at this time
Become specification slope after the weld seam of calculating are as follows:
According to the intermediate settings value that rolling procedure and step 2 calculate, the weld seam setting value of the 1st rack finally calculated is with before
Sliding setting value are as follows:
SR1=(1- α2)S(n+1),1+α2SI,1=(1-0.667) × 2.630+0.667 × 2.700=2.677mm
fR1=(1- α2)f(n+1),1+α2fI,1=(1-0.667) × 5.514+0.667 × 5.442=5.466
Milling train basic automation systems adjust Position of Hydraulic Cylinder and speed of rolls setting value according to the setting value of above-mentioned calculating,
To complete dynamic variable specification process after weld seam.With the forward movement of weld seam, α2It gradually becomes smaller until to 0, at this time after weld seam
The 1st rack is reached at 0.4m.The weld seam setting value and advancing slip setting value of the 1st rack calculated are as follows:
SR1=(1- α2)S(n+1),1+α2SI,1=(1-0) × 2.630+0 × 2.700=2.630mm
fR1=(1- α2)f(n+1),1+α2fI,1=(1-0) × 5.514+0 × 5.442=5.514
It can be seen that, mill roll-gap and advancing slip it be transitioned into rear coiled strip steel according to the above results and set from becoming specification intermediate settings value
Definite value.
Step 7: according to the α calculated in above-mentioned steps2Judge dynamic variable specification state before weld seam, works as α2When≤0, after weld seam
Dynamic variable specification terminates, i.e., the 1st rack dynamic variable specification terminates.
Other than the dynamic adjustment for increasing interstand tension, the dynamic variable specification process and the 1st rack class of 2-5 rack
Seemingly.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (8)
1. a kind of high precision plate strip rolling process dynamic variable specification implementation method based on feature point tracking, it is characterised in that including
Following steps:
- calculate and select two coiled strip steel dynamic variable specification intermediate settings value P of front and back in the operation of rollingI,i；
- dynamic variable specification initial point position is defined, by calculating the dynamic variable specification starting point in real time to steel band rate integrating
Become specification factor alpha before distance L, weld seam apart from the 1st frame central line of the operation of rolling1And become specification factor alpha after weld seam2；
- according to the value range of current calculated distance L, before the 1st rack operation of rolling is divided into the 1st rack weld seam
The dynamic variable specification stage after dynamic variable specification stage, weld metal zone rolling sequence and weld seam；
As the distance L < 0, in the dynamic variable specification stage before the 1st rack weld seam, become specification factor alpha before weld seam at this time1By 0
Increase to 1, i.e. 0 < α1< 1 becomes specification factor alpha after weld seam2It remains unchanged, numerical value 1, weld seam is calculated by following formula
Preceding change specification factor alpha1:
α1=(Lw,1+C1+C2)/C1
Lw,1For weld seam to the distance of the 1st frame central line, m；C2=0.1m, C1=0.3~0.5m；
As calculating α1When >=1, the dynamic variable specification stage terminates before weld seam, starts weld metal zone rolling sequence, the stage roll gap and speed
It remains unchanged, which originates in the position 0.1m before weld seam, ends at the position 0.1m after weld seam；
Become specification factor alpha after the weld seam2When being reduced by 1 to 0, become specification factor alpha before weld seam at this time1It remains unchanged, numerical value is
1, show to be currently at the dynamic variable specification stage after weld seam, at this point, becoming specification factor alpha after weld seam2It is calculated by following formula
It arrives:
α2=(C1-Lw,1+C3)/C1
In formula, C3=0.1m, after weld seam when the dynamic variable specification stage, the 1st rack fixed value of roller slit becomes specification mistake by a weld seam
It crosses to for next the 1st rack setting value of coiled strip steel roll gap, the 1st rack fixed value of roller slit is as follows；
SR1=(1- α2)S(n+1),1+α2SI,1
Wherein, SR1For the 1st rack fixed value of roller slit, S(n+1),1For next the 1st rack setting value of coiled strip steel roll gap, n is coiled material
Number, i.e. the n-th coiled strip steel；SI,1Become specification intermediate settings value for the 1st rack dynamical roll gap；
C1To become specification initial position before weld seam；C2Initial position, C are rolled for weld metal zone3For dynamic variable specification stop bits after weld seam
It sets；
- the rack operation of rolling each in the entire operation of rolling is divided into before weld seam the dynamic variable specification stage, weld metal zone rolls
The dynamic variable specification stage after stage and weld seam adjusts latter rack and previous rack according to the previous rack dynamic variable specification stage
Between tension, realize the operation of rolling in dynamic variable specification.
2. the high precision plate strip rolling process dynamic variable specification realization side according to claim 1 based on feature point tracking
Method, it is further characterized in that the change specification intermediate settings value PI,iIt includes at least: each rack roll gap, interstand tension, milling train
Exit thickness and advancing slip value；
PI,i=(P(n),i+P(n+1),i)/2
In formula, PI,iBecome specification intermediate settings value, P for the i-th rack(n),iFor current the i-th rack of coiled strip steel setting value, P(n+1),iFor
Next the i-th rack of coiled strip steel setting value.
3. the high precision plate strip rolling process dynamic variable specification realization side according to claim 1 based on feature point tracking
Method, it is further characterized in that the distance L calculating process is as follows:
L=L0-Lw,0-C1
In formula, L is distance of the dynamic variable specification starting point to the 1st frame central line of the operation of rolling, L0For inlet of rolling mill region overall length
Degree, Lw,0For the distance of welding seam distance inlet of rolling mill region initial position, which is accumulated by the speed to inlet of rolling mill region
Point, it is corrected using inlet of rolling mill welding seam detector, obtains the distance of welding seam distance inlet of rolling mill region initial position, calculating side
Method is shown below, C1=0.3~0.5m；
In formula, LbFor the distance of the previous adjacent area initial position of welding seam distance, m；LbfFor previous adjacent area total length, m；L0
For inlet of rolling mill region total length, m；Lw,1For the distance of the 1st frame central line of welding seam distance, m；VeFor current region strip fortune
Scanning frequency degree, m/s.
4. the high precision plate strip rolling process dynamic variable specification realization side according to claim 1 based on feature point tracking
Method, it is further characterized in that: when the 1st rack dynamic variable specification, the 1st breast roller speed is adjusted:
1st breast roller speed with the advancing slip value of the 1st rack, the 2nd rack is advancing slip, and value, the 2nd rack entrance actual (real) thickness and outlet are set
Determine that thickness is related, adjustable parameter only has the 1st advancing slip value of rack, advancing slip value f hereR1Calculation method be shown below,
fR1=(1- α1)f(n),1+α1fI,1；
Wherein, fR1For the 1st advancing slip value of rack, f(n),1For current the 1st advancing slip setting value of rack of coiled strip steel, n is the number of coiled material, i.e.,
N-th coiled strip steel；fI,1For the advancing slip change specification intermediate settings value of the 1st rack.
5. the high precision plate strip rolling process dynamic variable specification realization side according to claim 1 based on feature point tracking
Method, it is further characterized in that adjusting the 1st advancing slip value of breast roller after the 1st rack is in weld seam when the dynamic variable specification stage
fR1:
fR1=(1- α2)f(n+1),1+α2fI,1
Wherein, fI,1Indicate the advancing slip change specification intermediate settings value of the 1st rack, f(n+1),1Indicate the advancing slip setting of coiled strip steel under the 1st rack
Value.
6. the high precision plate strip rolling process dynamic variable specification realization side according to claim 1 based on feature point tracking
Method, it is further characterized in that: before the dynamic variable specification stage starts before the 2nd rack weld seam, the starting that is calculated according to the following formula
Point position judges whether the 2nd rack starts to execute dynamic variable specification；
In formula, t is time, V2For the 2nd rack outlet strip speed, L1,2The distance between 1,2 racks, i.e. two roller center lines
Distance, formula indicates that the 1st rack becomes specification starting point and reaches the 2nd rack entrance, thus the change specification process of the 2nd rack of triggering；
When the 1st rack, which becomes specification starting point, reaches 2 rack, dynamic variable specification starts before the 2nd rack weld seam.
7. the high precision plate strip rolling process dynamic variable specification realization side according to claim 6 based on feature point tracking
Method, it is further characterized in that: before the 2nd rack weld seam in dynamic variable specification phase process, tension needs are transitioned into down between 1-2 rack
Coiled strip steel tension setting value；
In the dynamic variable specification stage before the 2nd rack weld seam, tension target value is the rolling calculated in step 1 between 1-2 rack
Two coiled strip steel dynamic variable specification intermediate settings values of front and back, 1-2 interstand tension preset value calculation method such as following formula institute are selected in journey
Show,
TR,1-2=(1- α1)T(n),1-2+α1TI,1-2
Wherein, TR,1-2For 1-2 interstand tension setting value, T(n),1-2The tension setting value between current coiled strip steel 1-2 rack,
TI,1-2Tension becomes specification intermediate settings value between 1-2 rack；
Meanwhile the 2nd breast roller speed is adjusted, i.e., the 2nd advancing slip value of rack of adjusting, calculation method are shown below,
fR2=(1- α1)f(n),2+α1fI,2
Wherein, fR2For the 2nd advancing slip value of rack, f(n),2For the advancing slip setting value of advancing slip 2nd rack of current coiled strip steel, n is the volume of coiled material
Number, i.e. the n-th coiled strip steel；fI,2For the advancing slip change specification intermediate settings value of the 2nd rack.
8. the high precision plate strip rolling process dynamic variable specification realization side according to claim 7 based on feature point tracking
Method, it is further characterized in that: after the 2nd rack weld seam in the dynamic variable specification stage, the 2nd rack roll gap target value calculation method such as formula
(14) shown in；Between 1-2 rack shown in tension target value calculating method such as formula (15)；Advancing slip target value calculating method such as formula (16)
It is shown
SR2=(1- α2)S(n+1),2+α2SI,2 (14)
TR,1-2=(1- α2)T(n+1),1-2+α2TI,1-2 (15)
fR2=(1- α2)f(n+1),2+α2fI,2 (16)
Wherein, SR2For the 2nd rack fixed value of roller slit, S(n+1),2For next the 2nd rack setting value of coiled strip steel roll gap, n is coiled material
Number, i.e. the n-th coiled strip steel；SI,2Become specification intermediate settings value for the 2nd rack dynamical roll gap；
TR,1-2For 1-2 interstand tension setting value, T(n+1),1-2The tension setting value between next coiled strip steel 1-2 rack, TI,1-2For
Tension becomes specification intermediate settings value between 1-2 rack；
fR2For the 2nd advancing slip value of rack, fI,2For the advancing slip change specification intermediate settings value of the 2nd rack, f(n+1),2Indicate the 2nd rack last volume
Setting value that strip is advancing slip.
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