CN109530449A - A kind of controllable dot setting method in cut deal plan view control - Google Patents

A kind of controllable dot setting method in cut deal plan view control Download PDF

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CN109530449A
CN109530449A CN201811404295.3A CN201811404295A CN109530449A CN 109530449 A CN109530449 A CN 109530449A CN 201811404295 A CN201811404295 A CN 201811404295A CN 109530449 A CN109530449 A CN 109530449A
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rolled piece
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controllable dot
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CN109530449B (en
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丁敬国
赵忠
矫志杰
何纯玉
吴志强
王君
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Northeastern University China
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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
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
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    • G06F17/18—Complex mathematical operations for evaluating statistical data, e.g. average values, frequency distributions, probability functions, regression analysis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2263/00—Shape of product
    • B21B2263/04—Flatness

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Abstract

The present invention provides the controllable dot setting method in a kind of cut deal plan view control, is related to Medium and Heavy Plate Rolling automatic control technology field.This method determines rolled piece initial data, product objective size and rolling boundary condition, then the target thickness and rolling procedure that determine the broadening ratio of rolled piece, extend, turn the steel stage first；Then the set point number and set distance of flat shape controllable dot are determined；Resettle 3 gauss hybrid models, and the advancing slip value of process and the physical length of rolled piece are depressed or lifted to two neighboring set point during the setting of Calculation Plane controlled shape point, 3 Gaussian curve weightings are handled, the function expression of plan view control setting curve is obtained；The two neighboring set point of plan view control setting curve is finally subjected to piece-wise linearization processing, amounts of thickness variation in thickness change section and length simplification is linear；The rectangular degree and lumber recovery of cut deal product is greatly improved in controllable dot setting method in plan view control of the invention.

Description

A kind of controllable dot setting method in cut deal plan view control
Technical field
The present invention relates in Medium and Heavy Plate Rolling automatic control technology field more particularly to a kind of cut deal plan view control Controllable dot setting method.
Background technique
Steel industry is high energy-consuming industry, and research and development greenization technique and equipment realize green manufacturing, improve becoming a useful person for product Rate reduces energy consumption of unit product, guarantees that sustainable development is always the emphasis of steel industry concern.Cut deal is as steel industry Typical Representative product, the height of lumber recovery has very important influence to the greenization level of entire steel industry.In Slab lumber recovery is aoxidized by metal, clears up and is ground, rolling is lost and the factors such as slitter loss are influenced, and each factor is in middle thickness Shared ratio is as shown in Figure 1 in the loss of plate lumber recovery.As shown in Figure 1, it is raw to account for cut deal respectively for crop end and trimming loss Produce the 23% and 26% of total losses.
At the end of the seventies in last century, Kawasaki, Japan iron just develops MAS rolling, is carried out using 6 broken line setting methods Varying-thickness rolling, makes a degree of raising of product lumber recovery, as shown in Figure 2.After MAS rolling, final products are put down Though face shape makes moderate progress, but there is the defects of obvious " cat ear ", " tongue ".This is because traditional control process In, set point number is few, and setting curve form is simple, cannot achieve precise controlling, causes the bad head shape of rolled piece that can not disappear It removes, greatly limits the stable investment of plan view control process and further increasing for lumber recovery.
Summary of the invention
The technical problem to be solved by the present invention is in view of the above shortcomings of the prior art, provide a kind of cut deal flat shape Controllable dot setting method in control, to reach crop end and the trimming under the conditions of improving cut deal difference broadening ratio and ratio of elongation Loss improves product lumber recovery.
In order to solve the above technical problems, the technical solution used in the present invention is: in a kind of cut deal plan view control Controllable dot setting method, comprising the following steps:
Step 1 determines rolled piece initial data, product objective size and rolling boundary condition；
The rolled piece initial data, comprising: rolled piece thickness, width, length, drafts, steel grade, temperature and chemical component； The product objective size, comprising: product objective thickness, target width, trimming amount and target length；The rolling perimeter strip Part, comprising: environment temperature, cooling water temperature and roller temperature；
Step 2, initial data and product objective size according to rolled piece, determine the broadening ratio of rolled piece, extend, turn the steel stage Target thickness and rolling procedure；
Step 3, the set point number and set distance for determining flat shape controllable dot；
Step 3.1, the set point number for determining controllable dot, shown in following formula:
Wherein, n is the set point number of flat shape controllable dot, and RdUp () is the function that rounds up, and SprRatio is broadening Than ElRatio is ratio of elongation；
Step 3.2, the set distance for determining flat shape controllable dot, specifically:
It takes the half of length of rolled piece to be divided, takes the logarithm of length of rolled piece, n equal part is carried out to the logarithm, is obtained From workpiece front end to multiple nodes in rolled piece middle position, by the logarithm fetching numerical value of length corresponding to above-mentioned multiple nodes, Obtain the set point Distribution Value from workpiece front end to rolled piece middle position；
Step 4, the setting curve for determining plan view control；
Step 4.1 establishes 3 gauss hybrid models formed based on Gaussian probability-density function, shown in following formula:
Wherein, x is the distance apart from workpiece front end, lPVPCIt is flat shape wedge shape control action length, L is that rolled piece is long Degree, f0It is action length coefficient, takes 0.85, Ψ under normal circumstancesi(x, pi, σ) and it is Gaussian function, σ is Gaussian function width, one As in the case of take 0.28lPVPC, piIt is the central point of Gaussian function, p1=-0.2 × lPVPC、p2=0.2 × lPVPC、p3=0.6 × lPVPC；
Before two neighboring set point is depressed or lifts process during step 4.2, the setting of Calculation Plane controlled shape point Sliding value；
The advancing slip value of process is depressed or lifted to two neighboring set point during the calculating controllable dot setting, following public Shown in formula:
Wherein, SjFor two neighboring set point pressure during controllable dot setting or lift the advancing slip value of process, j=1, 2 ..., n, hj, hj+1Respectively inlet of rolling mill and exit rolled piece thickness, RwFor working roll radius；
The actual (tube) length angle value of rolled piece in step 4.3, Calculation Plane shape control process；
Take m-th of sampled point in tmThe roll actual measurement linear velocity at moment is vm, then from tm-1Moment is to tmMoment milling train institute The length of rolled piece of rolling are as follows:
Wherein, the maximum value M of m is the data collection point number that the sampling period is 0.05s in the rolled piece operation of rolling；
Step 4.4 handles 3 Gaussian curve weightings of different shapes, obtains the setting curve of plan view control Function expression, following formula are as follows:
S (x)=k × (w1×Ψ1+w2×Ψ2+w3×Ψ3) (5)
Wherein, wiIt is Gaussian function Ψi(x, pi, σ) weight；
The weighting coefficient of each Gaussian curve is handled as follows:
Wherein, fbi、fhi、fdwiIt is fitting coefficient, h1It is the target average caliper of broadening stage rolled piece, h0It is broadening rank Section rolled piece target thickness a reference value, dw are that rolled piece is averaged absolute spread, dw0It is that rolled piece is averaged absolute spread a reference value；
The two neighboring set point of the setting curve of plan view control is carried out piece-wise linearization processing by step 4.5, will Amounts of thickness variation and length simplification are linear in thickness change section, complete the setting of controllable dot in plan view control.
The beneficial effects of adopting the technical scheme are that a kind of cut deal flat shape control provided by the invention Controllable dot setting method in system solves 7 points of settings that traditional MAS rolling uses and the high order curve degree of approach is relatively low asks Topic is adjusted by the high flexibility ratio of 3 Gaussian curves, is realized to flat shape control using controllable dot flat shape setting technique Region processed carries out Precise control, so that the controllability to edge metal flow enhances, the rectangular degree of product is increased substantially.With Traditional MAS rolling is compared, and lumber recovery can be improved 1.5% or more by this method, can be widely popularized in Medium and Heavy Plate Rolling factory, To mention the rectangular degree and lumber recovery of cut deal product.
Detailed description of the invention
A kind of cut deal lumber recovery before Fig. 1 is implemented for present invention loses statistical chart；
Fig. 2 is the MAS rolling schematic diagram before a kind of present invention implementation；
Fig. 3 is a kind of flow chart of flat shape controllable dot setting method provided in an embodiment of the present invention；
Fig. 4 is the equidistant division schematic diagram of set point logarithm of an embodiment of the present invention；
Fig. 5 is that flat shape provided in an embodiment of the present invention sets curve graph；
Fig. 6 is that flat shape controllable dot provided in an embodiment of the present invention sets curve graph；
Fig. 7 carries out comparison before and after controllable dot plan view control effect comes into operation to rolled piece to be provided in an embodiment of the present invention Figure, wherein (a) is before coming into operation, (b) after to come into operation.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below Example is not intended to limit the scope of the invention for illustrating the present invention.
The present embodiment uses the controllable dot setting method in cut deal plan view control of the invention by taking certain rolled piece as an example The controllable dot setting in plan view control is carried out to the rolled piece.
A kind of controllable dot setting method in cut deal plan view control, as shown in Figure 3, comprising the following steps:
Step 1 determines rolled piece initial data, product objective size, broadening ratio, extends when rolled edge circle condition；It is described Determination rolled piece initial data, broadening ratio, extend when rolled edge circle condition, wherein the rolled piece initial data, comprising: Rolled piece thickness, width, length, drafts, steel grade, temperature and chemical component, the product objective size, comprising: product mesh Thickness, target width, trimming amount and target length are marked, rolls boundary condition, comprising: environment temperature, cooling water temperature and roll Temperature.
In the embodiment of the present invention, determine rolled piece initial data: rolled piece blank with a thickness of 250mm, blank width 1600mm, Charge length is 2800mm, target thickness 20mm, target width 2600mm, and trimming amount is 70mm, and blank tapping temperature is 1160 DEG C, steel grade Q345B, chemical component: C:0.17%, Si:0.51%, Mn:1.65%, P:0.033%, S:0.035%, V:0.02%, Nb:0.015%, Ti:0.02% determine rolling boundary condition: it is 30 DEG C including environment temperature, cooling water temperature It is 25 DEG C, roller temperature is 80 DEG C；
Step 2, the target thickness and rolling procedure for the broadening ratio for determining rolled piece, extending, turning the steel stage；
In the present embodiment, the broadening ratio of determining rolled piece, the target thickness and rolling procedure for extending, turning the steel stage, tool Body is as follows:
Broadening ratio=(2600+70)/1600=1.66875
Ratio of elongation=(250 × 1600 × 2800/20/2670)/2800=7.4906
Turn target thickness=(250 × the 1600)/2670=149.813mm in steel stage
In the embodiment of the present invention, rolling procedure is as shown in table 1, specific as follows:
1 rolling procedure of table
Step 3 determines flat shape controllable dot set point number and set distance, specific as follows:
Step 3.1, the set point number for determining controllable dot, shown in following formula:
Wherein, n is the set point number of flat shape controllable dot, and RdUp () is the function that rounds up, and SprRatio is broadening Than ElRatio is ratio of elongation；
In the present embodiment,
Step 3.2, the set distance for determining flat shape controllable dot, specifically:
It takes the half of length of rolled piece to be divided, takes the logarithm of length of rolled piece, 10 equal parts are carried out to the logarithm, are obtained From workpiece front end to multiple nodes in rolled piece middle position length logarithm fetching numerical value corresponding to above-mentioned node is obtained The set point Distribution Value from workpiece front end to rolled piece middle position is obtained, as shown in Fig. 4 and table 2.
Set point Distribution Value of the table 2 from workpiece front end to rolled piece middle position
In the present embodiment, the advancing slip value calculated in the actual measurement linear velocity and table 3 by acquiring operation roll of mill, and set and adopt The sample period is 0.05s, and the physical length of rolled piece is then calculated by formula (4),
Step 4, the setting curve for determining plan view control, specific as follows:
Step 4.1 establishes 3 gauss hybrid models formed based on Gaussian probability-density function, shown in following formula:
Wherein, x is the distance apart from workpiece front end, lPVPCIt is flat shape wedge shape control action length, L is that rolled piece is long Degree, f0It is action length coefficient, takes 0.85, Ψ under normal circumstancesi(x, pi, σ) and it is Gaussian function, σ is Gaussian function width, one As in the case of take 0.28lPVPC, piIt is the central point of Gaussian function, p1=-0.2 × lPVPC、p2=0.2 × lPVPC、p3=0.6 × lPVPC。
In the present embodiment, the mill length due to turning the steel stage is the target width value of target product, length cold conditions value For 2670mm, thermal expansion coefficient is set as 1.025, so the hot value of its length is 2736.75mm, therefore:
lPVPC=f0× L/2=0.85 × 2736.75/2=1163.119
K=(1-x/1163.119)2
Gaussian function width: σ=0.28lPVPC=0.28 × 1163.119=325.673
Three Gaussian functions are as follows:
p1=-0.2 × lPVPC=-0.2 × 1163.119=-232.6238
p2=0.2 × lPVPC=0.2 × 1163.119=232.6238
p3=0.2 × lPVPC=0.6 × 1163.119=697.8714
Step 4.2 calculates the two neighboring set point pressure of controllable dot setting process or lifts the advancing slip value of process, following public Shown in formula:
Wherein, SjFor two neighboring set point pressure during controllable dot setting or lift the advancing slip value of process, j=1, 2 ..., 10, hj, hj+1Respectively inlet of rolling mill and exit rolled piece thickness, RwFor working roll radius.
In the present embodiment, before two neighboring set point is depressed or lifts process during the controllable dot setting being calculated Sliding value is as shown in table 3:
The advancing slip value of process is depressed or lifted to two neighboring set point during the setting of 3 controllable dot of table
Step 4.3, the rolled piece actual (tube) length angle value of Calculation Plane shape control process；
Take m-th of sampled point in tmThe roll actual measurement linear velocity at moment is vm, then from tm-1Moment is to tmMoment milling train institute The length of rolled piece of rolling are as follows:
Step 4.4 handles 3 Gaussian curve weightings of different shapes, obtains the setting curve of plan view control Function expression, specific formula is as follows:
S (x)=0.9 × (w1×Ψ1+w2×Ψ2+w3×Ψ3) (5)
It can be fitted arbitrary curve after three Gaussian curves are weighted processing, therefore, by the weighting system of each Gaussian curve Number processing is as follows:
Wherein, fbi、fhi、fdwiIt is fitting coefficient, h1It is the target average caliper of broadening stage rolled piece, h0It is broadening rank Section rolled piece target thickness a reference value, dw are that rolled piece is averaged absolute spread, dw0It is that rolled piece is averaged absolute spread a reference value；
In the present embodiment, fb1=-15.0, fb2=5.0021, fb3=10.04, fh1=0.0000011, fh2= 0.000001, fh3=0.01006, fdw1=0.0, fdw2=0.002, fdw3=0.004, h1=149.813, h0=140, dw= 1070, dw0=500.
In the present embodiment, the computation model setting curve of the Leading Edge Deformation of Medium Plates based on Gaussian function and different weights pair The influence for setting curve is as shown in Figure 5.
The two neighboring set point of the setting curve of plan view control is carried out piece-wise linearization processing by step 4.5, will Amounts of thickness variation and length are simplified to linear relationship as shown in FIG. 6 in thickness change section, and completing can in plan view control Control the setting of point.
It is carried out carrying out plan view control to rolled piece according to Fig. 6, the control contrast effect for front and back of coming into operation is as shown in Figure 7.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used To modify to technical solution documented by previous embodiment, or some or all of the technical features are equal Replacement；And these are modified or replaceed, model defined by the claims in the present invention that it does not separate the essence of the corresponding technical solution It encloses.

Claims (7)

1. the controllable dot setting method in a kind of cut deal plan view control, it is characterised in that: the following steps are included:
Step 1 determines rolled piece initial data, product objective size and rolling boundary condition；
Step 2, initial data and product objective size according to rolled piece, the mesh for determining the broadening ratio of rolled piece, extending, turning the steel stage Mark thickness and rolling procedure；
Step 3, the set point number and set distance for determining flat shape controllable dot；
Step 4, the setting curve for determining plan view control；
Step 4.1 establishes 3 gauss hybrid models formed based on Gaussian probability-density function；
The advancing slip value of process is depressed or lifted to two neighboring set point during step 4.2, the setting of Calculation Plane controlled shape point；
The actual (tube) length angle value of rolled piece in step 4.3, Calculation Plane shape control process；
Step 4.4 handles 3 Gaussian curve weightings of different shapes, obtains the function of the setting curve of plan view control Expression formula；
The two neighboring set point of the setting curve of plan view control is carried out piece-wise linearization processing by step 4.5, by thickness Amounts of thickness variation and length simplification are linear in constant interval, complete the setting of controllable dot in plan view control.
2. the controllable dot setting method in a kind of cut deal plan view control according to claim 1, it is characterised in that: Rolled piece initial data described in step 1, comprising: rolled piece thickness, width, length, drafts, steel grade, temperature and chemical component；It is described Product objective size, comprising: product objective thickness, target width, trimming amount and target length；The rolling boundary condition, packet It includes: environment temperature, cooling water temperature and roller temperature.
3. the controllable dot setting method in a kind of cut deal plan view control according to claim 1, it is characterised in that: The step 3 method particularly includes:
Step 3.1, the set point number for determining controllable dot, shown in following formula:
Wherein, n is the set point number of flat shape controllable dot, and RdUp () is the function that rounds up, and SprRatio is broadening ratio, ElRatio is ratio of elongation；
Step 3.2, the set distance for determining flat shape controllable dot, specifically:
It takes the half of length of rolled piece to be divided, takes the logarithm of length of rolled piece, n equal part is carried out to the logarithm, is obtained from rolling Multiple nodes in part head to rolled piece middle position obtain the logarithm fetching numerical value of length corresponding to above-mentioned multiple nodes Obtain the set point Distribution Value from workpiece front end to rolled piece middle position.
4. the controllable dot setting method in a kind of cut deal plan view control according to claim 3, it is characterised in that: The gauss hybrid models that 3 of foundation described in step 4.1 are formed based on Gaussian probability-density function, shown in following formula:
Wherein, x is the distance apart from workpiece front end, lPVPCIt is flat shape wedge shape control action length, L is length of rolled piece, f0It is Action length coefficient, takes 0.85, Ψ under normal circumstancesi(x, pi, σ) and it is Gaussian function, σ is Gaussian function width, under normal circumstances Take 0.28lPVPC, piIt is the central point of Gaussian function, p1=-0.2 × lPVPC、p2=0.2 × lPVPC、p3=0.6 × lPVPC。
5. the controllable dot setting method in a kind of cut deal plan view control according to claim 4, it is characterised in that: The advancing slip value of process is depressed or lifted to two neighboring set point during the setting of calculating controllable dot described in step 4.2, following public Shown in formula:
Wherein, SiFor two neighboring set point pressure during controllable dot setting or lift the advancing slip value of process, j=1,2 ..., N, hj, hj+1Respectively inlet of rolling mill and exit rolled piece thickness, RwFor working roll radius.
6. the controllable dot setting method in a kind of cut deal plan view control according to claim 5, it is characterised in that: The step 4.3 method particularly includes:
Take m-th of sampled point in tmThe roll actual measurement linear velocity at moment is vm, then from tm-1Moment is to tmMoment milling train is rolled The following formula of length of rolled piece shown in:
Wherein, the maximum value M of m is the data collection point number that the sampling period is 0.05s in the rolled piece operation of rolling.
7. the controllable dot setting method in a kind of cut deal plan view control according to claim 6, it is characterised in that: The following formula of function expression of the setting curve of plan view control described in step 4.4 is as follows:
S (x)=k × (w1×Ψ1+w2×Ψ2+w3×Ψ3) (5)
Wherein, wiIt is Gaussian function Ψi(x, pi, σ) weight；
The weighting coefficient of each Gaussian curve is handled as follows:
Wherein, fbi、fhi、fdwiIt is fitting coefficient, h1It is the target average caliper of broadening stage rolled piece, h0It is to roll in the broadening stage Part target thickness a reference value, dw are that rolled piece is averaged absolute spread, dw0It is that rolled piece is averaged absolute spread a reference value.
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CN110404977A (en) * 2019-07-26 2019-11-05 东北大学 A kind of online quality judging method of plate strip rolling process
CN116713317A (en) * 2023-05-31 2023-09-08 张家港宏昌钢板有限公司 Steel plate rolling method based on thickness and widening ratio of steel plate blank
CN116803561A (en) * 2023-08-23 2023-09-26 太原科技大学 Board convexity measuring method of quasi-Gaussian distribution

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CN105436210A (en) * 2015-12-11 2016-03-30 东北大学 Thickness-changeable rolling method for heavy and medium plate mill
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Publication number Priority date Publication date Assignee Title
CN110404977A (en) * 2019-07-26 2019-11-05 东北大学 A kind of online quality judging method of plate strip rolling process
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CN116803561A (en) * 2023-08-23 2023-09-26 太原科技大学 Board convexity measuring method of quasi-Gaussian distribution
CN116803561B (en) * 2023-08-23 2023-10-27 太原科技大学 Board convexity measuring method of quasi-Gaussian distribution

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