CN116140375A - Roll bending and shifting cooperative control method for variable convexity working roll aiming at local high point of strip steel - Google Patents
Roll bending and shifting cooperative control method for variable convexity working roll aiming at local high point of strip steel Download PDFInfo
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- CN116140375A CN116140375A CN202310140883.5A CN202310140883A CN116140375A CN 116140375 A CN116140375 A CN 116140375A CN 202310140883 A CN202310140883 A CN 202310140883A CN 116140375 A CN116140375 A CN 116140375A
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 39
- 238000013000 roll bending Methods 0.000 title claims abstract description 39
- 239000010959 steel Substances 0.000 title claims abstract description 39
- 238000005452 bending Methods 0.000 claims abstract description 52
- 238000005096 rolling process Methods 0.000 claims abstract description 36
- 230000003044 adaptive effect Effects 0.000 claims abstract description 6
- 230000005465 channeling Effects 0.000 claims description 24
- 238000004364 calculation method Methods 0.000 claims description 16
- 230000006978 adaptation Effects 0.000 claims description 7
- 230000007547 defect Effects 0.000 abstract description 5
- 238000009826 distribution Methods 0.000 abstract description 5
- 238000005299 abrasion Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000010355 oscillation Effects 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 101100006960 Caenorhabditis elegans let-2 gene Proteins 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
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- 238000011217 control strategy Methods 0.000 description 1
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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
- B21B37/40—Control of flatness or profile during rolling of strip, sheets or plates using axial shifting of the rolls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2269/00—Roll bending or shifting
- B21B2269/12—Axial shifting the rolls
- B21B2269/14—Work rolls
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The invention discloses a roll bending and shifting cooperative control method of a variable convexity working roll aiming at a local high point of strip steel, and belongs to the technical field of steel rolling automation. Firstly, determining the one-way maximum fluctuation step number, the dynamic adjustment allowance of a bending roller, the resident adaptive block number, the fluctuation asynchronous coefficient and other bending roller fluctuation parameters; then calculating the fluctuation quantity of the bending roller of each rack; and finally, calculating the fluctuation amount of the roll shifting according to the fluctuation amount of the roll shifting, and respectively overlapping the fluctuation amount of the roll shifting to the initial set values of the roll shifting and the roll shifting to obtain the final set values of the roll shifting and the roll shifting. The cooperative strategy of the invention can expand the roll shifting distribution, alleviate the local high point defect of the strip steel caused by uneven wear of the variable convexity working roll, prolong the rolling mileage, ensure the roll bending adjustment allowance, and improve the rolling stability after fluctuation and the strip steel plate shape quality stability.
Description
Technical Field
The invention belongs to the technical field of steel rolling automation, and particularly relates to a roll bending and shifting cooperative control method of a variable convexity working roll aiming at local high points of strip steel.
Background
Improving the strip shape quality and reducing the rejection rate are hot spot problems of interest to manufacturers and scholars. The local high points are typical hot rolled strip plate shape problems, and irregular wear grooves appear on the roll body of the working roll due to uneven wear of the working roll, and the local high points are printed on the rolled piece in the rolling process, as shown in fig. 1. Axial play of the work rolls is often used to more disperse and homogenize wear.
The working roll forming technology is a key technology for controlling the shape of a hot rolling production process. The convexity-changing working roll is widely applied in the production process of hot rolled strip steel, and mainly represents the technology as follows: CVC work rolls (developed by cimak, germany, polynomial curve of three times), HVC work rolls (developed by beijing university of science and technology, polynomial curve of five times), smartCrown work rolls (developed by oshao, polynomial and Sin function composite roll shape), and the like. Fig. 2 shows a quintic polynomial high-order curve HVC working roll, wherein the roll body curve is S-shaped, and the upper and lower working rolls are arranged in a central symmetry manner. Different equivalent roll shapes are realized through axial movement of the working roll, and the purpose of adjusting the shape of the roll is achieved. The curve shape and working principle of the remaining variable crown work rolls are also substantially similar.
Compared with a conventional convexity working roll (such as a quadratic parabolic curve), the roll shifting of the variable convexity working roll has stronger roll gap convexity control capability, but the roll shifting rule is different. The conventional convexity working roll has small roll gap convexity change during the movement, so the roll gap convexity working roll can be periodically moved back and forth for a long stroke to homogenize the roll abrasion, and the roll shape is controlled mainly by adjusting the bending roll. The roll gap convexity can be obviously changed when the convexity-changing working roll moves, the roll gap convexity is mainly adjusted by adjusting the roll shifting, the roll bending is generally fixed near the middle value, the roll shifting position is required to be calculated and determined by a plate shape model according to a plate shape control target, and the roll shifting can not move randomly in a long stroke. In the production application of the variable convexity working rolls, the position of the roll shifting of each rack working roll is relatively fixed and has small change when rolling with the same specification in a large batch after the thermal convexity of the rolls is stable. The fixed position of the channeling roll can aggravate uneven wear of the roller and local high point defect of the strip steel, and abnormal section profile of the strip steel is formed. Therefore, the research and the invention of the asynchronous roll bending and roll shifting cooperative control method of the variable convexity working roll aiming at the local high point of the strip steel are hoped to solve the defect of the variable convexity working roll in the section control.
The roller shifting strategy is researched in a large number of existing documents, but different roller shifting strategies are mainly adopted for homogenizing roller wear of a conventional convexity working roller, such as a method for eliminating local wear of a flat roller working roller (application number: CN 201210163427.4) in patent 1, a roller shifting method with variable stroke and variable step length (application number: CN 201610034740.6) in patent 2, and the like.
In terms of roll shifting strategies of variable convexity working rolls, patent 3 (application number: CN 201110281509.4) proposes a method for eliminating local abrasion of working rolls of a CVC rolling mill, wherein the purpose of eliminating the local abrasion of the working rolls is achieved by changing the frequency and the amplitude of periodical roll shifting of the CVC working rolls, and the width difference of adjacent strip steels is used as a judging basis for starting the periodical roll shifting mode. Patent 4 (application number: CN 201610023972.1) proposes a roll shifting strategy of a hot rolling high-order curve working roll taking both wave shape and section into consideration, and judges whether to start the roll shifting strategy according to roll shifting positions of adjacent strip steel.
There is still a need to address the following problems in terms of a variable crown work roll shifting strategy. Firstly, after the periodic oscillation type channeling roll is started, the roll bending setting is correspondingly changed to keep the roll gap convexity unchanged, but the changed roll bending still needs to keep the up-and-down adjustment allowance for dynamically controlling the plate shape. Secondly, the starting strategy of the periodically oscillating type channeling roll should be more flexible, and the method is suitable for special working conditions such as standard cross rolling, and can expand the position distribution of the channeling roll in the whole rolling unit as much as possible and homogenize the roller abrasion. Thirdly, the simultaneous change of the bending and channeling rollers inevitably affects the rolling stability and the strip steel plate shape quality stability, so that a corresponding strategy is required to increase the stability.
Disclosure of Invention
The invention provides a roll shifting cooperative control method of a variable convexity working roll aiming at local high points of strip steel, which aims at further optimizing the roll shifting strategy of the existing variable convexity working roll, ensuring the roll shifting adjustment allowance for dynamic control, expanding roll shifting distribution, ensuring rolling stability and strip steel plate shape quality stability.
In order to solve the technical problems, the invention provides the following technical scheme:
the method comprises the following steps:
s1, determining bending fluctuation parameters:
the roll fluctuation parameters comprise a unidirectional maximum fluctuation step number N and a roll dynamic adjustment allowance a 1 (refer to the number of resident adaptive blocks a with margin for ensuring dynamic regulation ability of plate shape) 2 (referring to the number of blocks that the roll resides at the same fluctuation position in order to facilitate control of model adaptation and rolling stability) and fluctuation asynchronization coefficient a 3 (means that bending (channeling) roller fluctuation of each rack is performed in an unsynchronized mode, and mass changes caused by fluctuation amount of each rack are mutually counteracted, so that stability of plate-shaped quality is facilitated);
s2, calculating the roll bending fluctuation quantity of each rack:
the roll fluctuation amount DeltaBF (i，n) The calculation process is as follows:
in the formula, deltaBF (i，n) The unit is kN, i is the serial number of the frame, and n is the serial number of the rolled piece;
δ (i) the single-step fluctuation amount of the bending roller of the ith frame is given as kN;
alpha, beta, gamma are intermediate variables;
Δn (i) asynchronous adjustment amount for the ith rack;
sp is the number of rolling pieces corresponding to a single fluctuation period;
floor () is a downward rounding function;
% is the division remainder operator;
n is the number of unidirectional maximum fluctuation steps, and the number of steps required by the fluctuation amount of the digital bending roller from a positive (negative) extreme value to a negative (positive) extreme value;
s3, determining final set values of bending and channeling:
calculating the fluctuation amount of the roll shifting according to the fluctuation amount of the roll shifting, and respectively superposing the fluctuation amount of the roll shifting and the fluctuation amount of the roll shifting on an initial set value of the roll shifting and an initial set value of the roll shifting to obtain final set values of the roll shifting and the roll shifting;
the roll-shifting fluctuation quantity delta SFT (i，n) The calculation process is as follows:
in the formula, ΔSFT (i，n) The unit is mm for the fluctuation amount of the running roller;
K BF the unit is mu m/kN which is the influence coefficient of a bending roll on the convexity of a roll gap;
K SFT the unit is mu m/mm for the influence coefficient of the channeling roller on the convexity of the roller gap.
The value range of the unidirectional maximum fluctuation step number N of the bending roller in the S1 is 5-7;
dynamic adjustment allowance a of bending roll 1 The value range is 300-500kN;
number of resident adaptation blocks a 2 The value range is 2-3 blocks;
fluctuation asynchronous coefficient a 3 =round (2 (n+1)/3), where round () is a rounding function.
The single-step fluctuation delta of the S2 bending roller (i) The calculation process of (2) is as follows:
in ub (i) The upper limit of the bending roller after the adjustment quantity is reserved is given as kN;
lb (i) the lower limit of the bending roller after the adjustment quantity is reserved is given as kN;
ub0 (i) is the upper limit of the ability of the roll bending equipment, and the unit is kN;
lb0 (i) is the lower limit of the roll bending equipment capacity, and is expressed in kN.
The specific calculation process of the number Sp of the rolled pieces corresponding to the single fluctuation period in the S2 is as follows:
Sp＝2(N+1)a 2
wherein N is the number of one-way maximum fluctuation steps of the bending roller, a 2 The number of adaptation blocks for dwell.
The asynchronous adjustment amount delta n in the S2 (i) The specific calculation process of (2) is as follows:
Δn (i) ＝(i-1)a 3
wherein i is a frame number, a 3 Is a fluctuating asynchronous coefficient.
And 3, calculating final set values of the bending roller and the shifting roller in the step of S3 as follows:
BF (i，n) ＝BF0 (i) +ΔBF (i，n)
SFT (i，n) ＝SFT0 (i，n) +ΔSFT (i，n)
in BF (i，n) The unit is kN for the final set value of the bending roller;
SFT (i，n) the unit is mm for the final set value of the channeling roller;
BF0 (i) the unit is kN for the initial setting value of the bending roller;
SFT0 (i，n) the initial set value of the roller is mm.
The initial setting value BF0 of the bending roller (i) The method comprises the following steps:
BF0 (i) ＝(ub0 (i) +lb0 (i) )/2
lb0 (i) is the lower limit of the roll bending equipment capacity, and is expressed in kN.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
according to the technical scheme, the roll shifting change is driven based on the periodical oscillation change of the bending roll, so that the bending roll adjusting allowance is ensured; the whole rolling unit starts periodic oscillation change to expand the roll shifting distribution; the asynchronous change coefficient of each frame and the resident adaptive block number are introduced to improve the rolling stability and the strip steel plate shape quality stability.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of uneven wear of a working roll and local high points of a strip steel in an embodiment of the invention;
FIG. 2 is a schematic view of a variable crown work roll in an embodiment of the present invention;
FIG. 3 is a roll profile of the first 3 frames under conventional strategy;
FIG. 4 is a graph of roll-over profile for the first 3 frames under conventional strategy;
FIG. 5 is a graph showing the distribution of rolls of the first 3 frames under a cooperative strategy in an embodiment of the present invention;
FIG. 6 is a graph showing roll-over profiles of the first 3 frames under a cooperative strategy in an embodiment of the present invention;
FIG. 7 shows the sectional shape of the strip steel at the later stage of the rolling unit under the conventional strategy;
FIG. 8 shows the sectional shape of the strip steel at the later stage of the rolling unit under the cooperative strategy in the embodiment of the invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
The invention provides a roll bending and shifting cooperative control method of a variable convexity working roll aiming at a local high point of strip steel.
The method comprises the following steps:
s1, determining bending fluctuation parameters:
the roll fluctuation parameters comprise a unidirectional maximum fluctuation step number N and a roll dynamic adjustment allowance a 1 Number of resident adaptive blocks a 2 And a fluctuation asynchronous coefficient a 3 ；
S2, calculating the roll bending fluctuation quantity of each rack:
the roll fluctuation amount DeltaBF (i，n) The calculation process is as follows:
in the formula, deltaBF (i，n) The unit is kN, i is the serial number of the frame, and n is the serial number of the rolled piece;
δ (i) the single-step fluctuation amount of the bending roller of the ith frame is given as kN;
alpha, beta, gamma are intermediate variables;
Δn (i) asynchronous adjustment amount for the ith rack;
sp is the number of rolling pieces corresponding to a single fluctuation period;
floor () is a downward rounding function;
% is the division remainder operator;
n is the unidirectional maximum fluctuation step number;
s3, determining final set values of bending and channeling:
calculating the fluctuation amount of the roll shifting according to the fluctuation amount of the roll shifting, and respectively superposing the fluctuation amount of the roll shifting and the fluctuation amount of the roll shifting on an initial set value of the roll shifting and an initial set value of the roll shifting to obtain final set values of the roll shifting and the roll shifting;
the roll-in waveQuantity ΔSFT (i，n) The calculation process is as follows:
in the formula, ΔSFT (i，n) The unit is mm for the fluctuation amount of the running roller;
K BF the unit is mu m/kN which is the influence coefficient of a bending roll on the convexity of a roll gap;
K SFT the unit is mu m/mm for the influence coefficient of the channeling roller on the convexity of the roller gap.
The following describes specific embodiments.
In the embodiment, the whole rolling unit production steel grade is cold rolling base material SPHC, the width is 1250mm, the thickness of the main rolled material is 3.0mm, and 60 coils of strip steel are produced simultaneously, and the method belongs to large-batch rolling with the same width. The adoption of the convexity-changing working roll technology can easily cause local high point defect of the strip steel due to uneven abrasion of the working roll in the middle and later stages of the rolling unit, so that the convexity-changing working roll bending and channeling cooperative control method aiming at the local high point of the strip steel is adopted.
Taking the setting calculation of the 1 st strip steel of the finish rolling 1 st stand as an example, the following description will be given: frame number 1 i=1, and the upper and lower limits of the roll bending equipment capacity are ub0 (1) ＝1500kN，lb0 (1) 200kN, product number n=1. Calculation of other stands and products after changing the values of i, n and the upper and lower limits of the roll bending apparatus capacity, and so on.
S1, determining bending fluctuation parameters:
one-way maximum fluctuation step number N is 6, and the allowance a is dynamically adjusted by a bending roll 1 Taking 400kN, resident adaptive block number a 2 Let 2, the fluctuation asynchronous coefficient a3=round (2 (n+1)/3) =round (14/3) =5.
S2, calculating the roll bending fluctuation quantity of each rack:
according to the formula, the upper limit and the lower limit ub of the bending roller after the reserved adjustment quantity can be obtained (1) And lb (1) And the single-step fluctuation delta of the bending roller (1) The method comprises the following steps:
according to the formula, the number Sp of the rolling pieces corresponding to the single fluctuation period is as follows:
Sp＝2(N+1)a 2 ＝2×(6+1)×2＝28
according to the formula, the asynchronous adjustment quantity delta n (1) The method comprises the following steps:
Δn (1) ＝(i-1)a 3 ＝(1-1)×5＝0
according to the formula, the roll fluctuation quantity delta BF (1，1) And the intermediate quantities alpha, beta and gamma are as follows:
s3, calculating roll shifting fluctuation according to the roll bending fluctuation, and respectively superposing the roll bending fluctuation and the roll shifting fluctuation on original roll bending and roll shifting set values:
calculating and providing an influence coefficient K of bending and channeling on roll gap convexity by using a plate shape model in an automatic system BF ＝-0.126μm/kN、K SFT = -1.57, and roll-shifting initial setting value SFT0 (i，n) =38.3 mm. In addition, the initial setting value of the bending roller takes the intermediate value of the upper limit and the lower limit of the equipment:
BF0 (1) ＝(ub0 (1) +lb0 (1) )/2＝(1500+200)/2＝850kN
according to the formula, the roll-shifting fluctuation quantity delta SFT (1，1) The method comprises the following steps:
according to the formula, the final setting value BF of the bending roller (1，1) DFT of final set value of roll shifting (1，1) The method comprises the following steps of:
by analogy, the change in roll bending fluctuation amount of the 1 st stand in the rolling unit is shown in table 1.
TABLE 1 roll bending fluctuation amount of frame 1 and calculation of the intermediate amount change in the rolling unit
| Rolling stock number n | α | β | γ | ΔBF(kN) | ΔSFT(mm) |
| 1 | 0 | 0 | 0 | 250.0 | -20.1 |
| 2 | 0 | 0 | 1 | 250.0 | -20.1 |
| 3 | 0 | 1 | 2 | 166.7 | -13.4 |
| 4 | 0 | 1 | 3 | 166.7 | -13.4 |
| 5 | 0 | 2 | 4 | 83.3 | -6.7 |
| 6 | 0 | 2 | 5 | 83.3 | -6.7 |
| 7 | 0 | 3 | 6 | 0.0 | 0.0 |
| 8 | 0 | 3 | 7 | 0.0 | 0.0 |
| 9 | 0 | 4 | 8 | -83.3 | 6.7 |
| 10 | 0 | 4 | 9 | -83.3 | 6.7 |
| 11 | 0 | 5 | 10 | -166.7 | 13.4 |
| 12 | 0 | 5 | 11 | -166.7 | 13.4 |
| 13 | 0 | 6 | 12 | -250.0 | 20.1 |
| 14 | 0 | 6 | 13 | -250.0 | 20.1 |
| 15 | 1 | 0 | 0 | -250.0 | 20.1 |
| 16 | 1 | 0 | 1 | -250.0 | 20.1 |
| 17 | 1 | 1 | 2 | -166.7 | 13.4 |
| 18 | 1 | 1 | 3 | -166.7 | 13.4 |
| 19 | 1 | 2 | 4 | -83.3 | 6.7 |
| 20 | 1 | 2 | 5 | -83.3 | 6.7 |
| 21 | 1 | 3 | 6 | 0.0 | 0.0 |
| 22 | 1 | 3 | 7 | 0.0 | 0.0 |
| 23 | 1 | 4 | 8 | 83.3 | -6.7 |
| 24 | 1 | 4 | 9 | 83.3 | -6.7 |
| 25 | 1 | 5 | 10 | 166.7 | -13.4 |
| 26 | 1 | 5 | 11 | 166.7 | -13.4 |
| 27 | 1 | 6 | 12 | 250.0 | -20.1 |
| 28 | 1 | 6 | 13 | 250.0 | -20.1 |
| ··· | ··· | ··· | ··· | ··· | ··· |
As shown in fig. 3 and fig. 4, for the change condition of the roll bending and roll shifting set values of the first three frames in the rolling unit under the conventional setting strategy, it can be seen that the roll bending setting of the conventional strategy is unchanged, the head plate shape is controlled by adjusting the roll shifting, the roll shifting continuously descends in the early stage of the rolling unit to compensate the increased roll thermal convexity, but the thermal convexity tends to be stable in the middle and later stages, the roll shifting changes slowly, and the uniformity of roll wear is not facilitated.
As shown in fig. 5 and fig. 6, for the change condition of the roll bending and roll shifting set values of the first three frames in the rolling unit under the cooperative setting strategy of the invention, the regular up-and-down fluctuation of the roll bending can be seen, thereby driving the roll shifting setting to reversely fluctuate, the roll shifting difference between the wave crest and the wave trough in the fluctuation is about 40mm, the roll shifting range is obviously expanded, and the uniform abrasion is facilitated. The bending roller setting algorithm can be seen to reserve adjustment quantity for plate shape dynamic control; the bending and channeling rollers are set at different fluctuation positions to enable 2 strip steel to reside, so that model self-adaption and rolling stability can be controlled; by introducing an asynchronous coefficient, the fluctuation positions of the bending and channeling rollers of different frames are different, and the quality changes brought by the fluctuation amounts of the frames are mutually offset, so that the stability of the plate-shaped quality is facilitated.
As shown in fig. 7 and 8, the sectional shapes of the strip steel in the later stage of the rolling unit under the conventional strategy and the cooperative strategy of the invention are compared, and it can be seen that the conventional strategy has obvious local high point defects on two sides of the strip steel due to the relative fixed channeling and uneven wear of the rollers in the later stage of rolling. The cooperative control strategy is characterized in that the rolling roll fluctuation is adopted to homogenize the abrasion of the corresponding position of the strip steel edge, so that local high points are avoided, the section shape of the strip steel is improved, and the rolling mileage is improved.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (7)
1. A roll bending and shifting cooperative control method of a variable convexity working roll aiming at a local high point of strip steel is characterized by comprising the following steps:
s1, determining bending fluctuation parameters:
the roll fluctuation parameters comprise a unidirectional maximum fluctuation step number N and a roll dynamic adjustment allowance a 1 Number of resident adaptive blocks a 2 And a fluctuation asynchronous coefficient a 3 ；
S2, calculating the roll bending fluctuation quantity of each rack:
the roll fluctuation amount DeltaBF (i，n) The calculation process is as follows:
in the formula, deltaBF (i，n) The unit is kN, i is the serial number of the frame, and n is the serial number of the rolled piece; delta (i) The single-step fluctuation amount of the bending roller of the ith frame is given as kN;
alpha, beta, gamma are intermediate variables;
Δn (i) asynchronous adjustment amount for the ith rack;
sp is the number of rolling pieces corresponding to a single fluctuation period;
floor () is a downward rounding function;
% is the division remainder operator;
n is the unidirectional maximum fluctuation step number;
s3, determining final set values of bending and channeling:
calculating the fluctuation amount of the roll shifting according to the fluctuation amount of the roll shifting, and respectively superposing the fluctuation amount of the roll shifting and the fluctuation amount of the roll shifting on an initial set value of the roll shifting and an initial set value of the roll shifting to obtain final set values of the roll shifting and the roll shifting;
the roll-shifting fluctuation quantity delta SFT (i，n) The calculation process is as follows:
in the formula, ΔSFT (i，n) The unit is mm for the fluctuation amount of the running roller;
K BF the unit is mu m/kN which is the influence coefficient of a bending roll on the convexity of a roll gap;
K SFT the unit is mu m/mm for the influence coefficient of the channeling roller on the convexity of the roller gap.
2. The cooperative control method for bending and channeling of a variable convexity working roll aiming at a local high point of strip steel according to claim 1, wherein the value range of the unidirectional maximum fluctuation step number N of the bending roll in S1 is 5-7;
dynamic adjustment allowance a of bending roll 1 The value range is 300-500kN;
number of resident adaptation blocks a 2 The value range is 2-3 blocks;
fluctuation asynchronous coefficient a 3 =round (2 (n+1)/3), where round () is a rounding function.
3. The cooperative control method for roll bending of variable convexity working rolls for local high points of strip steel according to claim l, wherein the roll bending single-step fluctuation delta of the ith frame in S2 (i) The calculation process of (2) is as follows:
in ub (i) The upper limit of the bending roller after the adjustment quantity is reserved is given as kN;
lb (i) the lower limit of the bending roller after the adjustment quantity is reserved is given as kN;
ub0 (i) is the upper limit of the ability of the roll bending equipment, and the unit is kN;
lb0 (i) is the lower limit of the roll bending equipment capacity, and is expressed in kN.
4. The cooperative control method of roll bending and channeling of the variable convexity working roll for local high points of strip steel according to claim 1, wherein the specific calculation process of the number Sp of the rolling pieces corresponding to a single fluctuation period in S2 is as follows:
Sp＝2(N+1)a 2
wherein N is the number of one-way maximum fluctuation steps of the bending roller, a 2 The number of adaptation blocks for dwell.
5. The cooperative control method for roll bending and shifting of a variable convexity working roll for local high points of strip steel according to claim 1, wherein the asynchronous adjustment amount Δn in S2 is (i) The specific calculation process of (2) is as follows:
Δn (i) ＝(i-1)a 3
wherein i is a frame number, a 3 Is a fluctuating asynchronous coefficient.
6. The cooperative control method for bending and channeling of a variable convexity working roll for a local high point of strip steel according to claim l, wherein the final set value calculation process of the bending and channeling in S3 is as follows:
BF (i，n) ＝BF0 (i) +ΔBF (i，n)
SFT (i，n) ＝SFT0 (i，n) +ΔSFT (i，n)
in BF (i，n) The unit is kN for the final set value of the bending roller;
SFT (i，n) the unit is mm for the final set value of the channeling roller;
BF0 (i) the unit is kN for the initial setting value of the bending roller;
SFT0 (i，n) the initial set value of the roller is mm.
7. The cooperative control method for bending and channeling of variable convexity working rolls for local high points of strip steel according to claim 6, characterized in that the initial roll bending set value BF0 (i) The method comprises the following steps:
BF0 (i) ＝(ub0 (i) +lb0 (i) )/2
in the above, ub0 (i) Is the upper limit of the ability of the roll bending equipment, and the unit is kN;
lb0 (i) is the lower limit of the roll bending equipment capacity, and is expressed in kN.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310140883.5A CN116140375B (en) | 2023-02-15 | 2023-02-15 | Roll bending and shifting cooperative control method for variable convexity working roll aiming at local high point of strip steel |
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| CN202310140883.5A CN116140375B (en) | 2023-02-15 | 2023-02-15 | Roll bending and shifting cooperative control method for variable convexity working roll aiming at local high point of strip steel |
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| CN116140375A true CN116140375A (en) | 2023-05-23 |
| CN116140375B CN116140375B (en) | 2024-04-16 |
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