CN114769325B - Control method for hot continuous rolling CVC working roll shifting - Google Patents
Control method for hot continuous rolling CVC working roll shifting Download PDFInfo
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- CN114769325B CN114769325B CN202210444527.8A CN202210444527A CN114769325B CN 114769325 B CN114769325 B CN 114769325B CN 202210444527 A CN202210444527 A CN 202210444527A CN 114769325 B CN114769325 B CN 114769325B
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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
- B21B37/42—Control of flatness or profile during rolling of strip, sheets or plates using a combination of roll bending and 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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Abstract
The invention discloses a control method for hot continuous rolling CVC working roll shifting, and belongs to the technical field of plate and strip rolling. The control method of the invention uses the periodic adjustment of the bending roller set value in the same width of rolled strip steel in one rolling period, simultaneously gives a roller channeling coordination change model, expands the working roller channeling stroke, achieves the effect of uniform roller wear and improves the rolling mileage; and (3) rolling strip steel with different widths, fixing the bending force of each frame, and executing normal travel of the channeling rolls to maintain rolling stability under width jump. By adopting the control method, the running distance of the working rolls is increased by 30-60 mm during the same-width rolling, and the kilometer number of the same-width rolling is obviously increased.
Description
Technical Field
The invention belongs to the technical field of plate and strip rolling, and particularly relates to a control method for channeling of a hot continuous rolling working roll.
Background
The CVC rolling mill has the characteristics of strong convexity adjustment capability and rapid adjustment, but also has the problems of serious edge abrasion and short rolling mileage during the same width rolling, and is unfavorable for improving the production efficiency because of the restriction on batch rolling of thin products. The work rolls move transversely, so that the abrasion of the work rolls is uniform, and the convexity-changing work rolls can also adjust the convexity of roll gaps through the work rolls, thereby realizing the control of the strip steel plate shape. Each time a strip is rolled, the work rolls are then moved laterally a distance called the roll-shifting step. The distance from the roll center line to the extreme position of the work rolls is called the stroke. The conventional work rolls usually adopt a reciprocating roll shifting method, namely, after the work rolls shift to a limit position in one direction (a transmission side or an operation side), the work rolls shift to the opposite direction (the operation side or the transmission side) until reaching the limit position of the side, and then shift to the opposite direction, so that the work rolls reciprocate. The roller scuffing of the working roller can be reduced to a certain extent, but the existing roller scuffing mode does not consider the influence of the strip steel width on the roller scuffing, the length of the roller body of the working roller is not fully exerted, and the problem that the working roller is easy to wear is not effectively solved.
Through searching, the application with the Chinese patent application number of 201911303850.8 discloses a method for prolonging the roller period of a 1250 hot continuous rolling finishing mill group, and the application proposes that F1-F4 working rollers adopt parabolic negative convexity working roller shapes, adopt asynchronous equal-stroke roller shifting strategies, F5-F7 adopt double-cone working roller shapes and adopt asynchronous cosine roller shifting strategies, and convexity control capability does not change along with roller shifting position changes. However, the relation between the channeling and the bending is not given in the application, the convexity control capability mainly depends on manual given bending, and the method can be applied under the condition of relatively single steel grade and specification and small change range of the strip steel width. But is not applicable to scenes with complex varieties, large width variation and high convexity control capability.
For another example, the application of the Chinese patent application number 201810016072.3 discloses a method for dispersing the roll shifting position of a CVC working roll, in the application, according to the difference of roll shifting positions and roll shifting limit values of the K-1 strip steel working roll and the K-1 strip steel working roll, the roll shifting position is randomly judged and given, the roll bending force is calculated according to the roll shifting position, the roll bending force is judged to be within the limit limiting range in a corresponding frame, and the roll shifting value and the roll bending value are finally determined. The method can enlarge the running distance of the running roller and improve the uniform abrasion of the working roller, but has the problems that the bending force is changed greatly and the convexity change caused by the running roller cannot be compensated. In addition, the roll-through position in this application employs a randomly distributed algorithm, although dispersed in a plurality of rolls, the roll-through position of the next piece of steel cannot be predicted, and is an uncertain position. When the roll shifting amount is in the judged limit position, the bending roll is also in the limit position, so that the dynamic adjustment capability is lost. For rolling strip steel with different widths, the rolling instability problem is caused by enlarging the roll shifting stroke.
Disclosure of Invention
1. Problems to be solved
In order to solve the problems, the invention provides a method for controlling roll shifting of a hot continuous rolling CVC working roll. By adopting the technical scheme of the invention, the problems that the running travel is insufficient in the same-width rolling process, the running travel is overlarge in the non-same-width rolling process and the specification jump stability is influenced are effectively solved, and meanwhile, enough dynamic adjustment capability is reserved for the bending roller, so that the method can be applied to a finish rolling full-stand and the running rule is controllable.
2. Technical proposal
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the invention discloses a control method for hot continuous rolling CVC working roll shifting, which comprises the following steps:
step one, configuring bending force variation amplitude values for all frames of finish rolling
Step two, configuring preset offset strip steel numbers for each frame of the finish rolling
Step three, according to the change amplitude of the bending forcePresetting the number of offset strip steel->Number of steel blocks of varying period cyc Obtaining the roller force change value FB of each frame chg ；
Step four, constructing a model of the relation between the roll shifting variable quantity and the roll bending force variable value to obtain an equivalent roll shifting quantity delta S and a set roll shifting quantity S after roll bending change norm ；
And fifthly, judging whether the roller shifting condition is met, and if so, shifting the roller according to the model constructed in the fourth step.
Further, in the fifth step, the specific step of judging the roll shifting condition is that,
s1, judging whether the following slabs have continuous same-width slabs or not and the number of the continuous same-width slabs;
s2, if the judgment result does not exceed the preset same-width threshold numberThe circulating roller shifting function is not started; if the judgment result exceeds the same width threshold number +.>Starting a circulating roller shifting function and entering a step S3;
s3, continuously judging whether the number of the follow-up same-width boards is larger than the number of the residual circulationIf yes, ->And the circulating roller shifting function is always started; if no, then->Enter into the circulation roller shifting function until +.>The circulation is jumped out, and the circulation roller-shifting function is terminated.
Further, in the specific judging process in step S1, after the roll change or calibration is completed, each slab is judged whether it is the same-width slab, the number of the same-width slabs is accumulated, and when the accumulated number reaches the same-width threshold numberAnd starting a circulating roller shifting function.
Further, in step S3, the number of blanks of the same width is smaller than the threshold number of the same widthIf BFM (i) Absence or Abs (B) FM(0) －B FM(i) )≥△B thd Then->Enter into a circulating roller shifting function, wherein B FM(0) For the width of the current strip steel finished product, B FM(i) For the width of the finished product of the lower coiled steel, delta B thd Is the same width judgment condition.
Further, in the fourth step, the conversion relationship between the roll shifting variable and the roll bending force variable is: Δs= -K FB chg ，Wherein k=a (D/D 0 )B*(b/B 0 ) c, A, B, C are both coefficients, d: work roll diameter, D 0 : maximum diameter of work roll, b: width of strip steel B 0 : back-up roll length, Δs: equivalent roll shifting quantity after roll bending change, FB chg : the change value of the bending force S norm : setting the roll shifting amount and the roll shifting amount>Original roll shifting amount.
Further, the roll force change value FB chg Sinusoidal variations are employed.
Further, the roll force variation valueThe bending force is set +.>Wherein (1)>For the magnitude of the change of the bending force, N rolled : the number of rolled strip steel is periodically changed by bending rolls, +.>Presetting the number of offset strip steel N cyc : the number of steel blocks in a variation period, < >>Original roll force, FB norm The roll bending force is set.
Further, the roll bending force variation amplitude of each frameAccording to the steel grade, thickness and width progress division, wherein the bending force change amplitude of the F1 frame is 300, the bending force change amplitude of the F2 frame is 300, the bending force change amplitude of the F3 frame is 300, the bending force change amplitude of the F4 frame is 300, the bending force change amplitude of the F5 frame is 400, the bending force change amplitude of the F6 frame is 400, and the bending force change amplitude of the F7 frame is 400.
Further, the presetting of each rackNumber of offset stripsThe preset values are respectively that the preset offset strip steel number of the F1 frame is 4, the preset offset strip steel number of the F2 frame is 9, the preset offset strip steel number of the F3 frame is 3, the preset offset strip steel number of the F4 frame is 7, the preset offset strip steel number of the F5 frame is 5, the preset offset strip steel number of the F6 frame is 1 and the preset offset strip steel number of the F7 frame is 4.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the control method for the hot continuous rolling CVC working roll shifting, when rolling is performed in the same width, the working roll is shifted through regular change of the bending roll, so that abrasion of edge areas is reduced, and the rolling mileage is increased; when rolling is performed in different widths, the specification jump enables the working roll to move, and at the moment, the bending roll is kept relatively fixed, so that the working roll is prevented from moving too much;
(2) According to the control method for the roll shifting of the hot continuous rolling CVC working roll, the roll bending force changes in a sinusoidal manner, so that the roll bending force changing directions of all frames are inconsistent or asynchronous, the local abrasion areas of all originally fixed rolls can be avoided, and the section shape of the strip steel is smoother;
(3) According to the control method for the roller shifting of the hot continuous rolling CVC working roller, the roller shifting stroke of the working roller is increased by 30-60 mm during the same-width rolling, and the number of kilometers during the same-width rolling is obviously increased.
Drawings
FIG. 1 is a flow chart of judging a roll shifting condition in the present invention;
FIG. 2 is a graph showing the roll force variation function of the present invention;
FIG. 3 is a graph of a roll force setting in accordance with the present invention;
fig. 4 is a graph of a change in roll shifting of a work roll in the present invention.
Detailed Description
The invention is further described below in connection with specific embodiments.
Example 1
The control method of the hot continuous rolling CVC working roll shifting comprises the following steps,
step one, configuring bending force variation amplitude values for all frames of finish rolling
Step two, configuring preset offset strip steel numbers for each frame of the finish rolling
Step three, according to the change amplitude of the bending forcePresetting the number of offset strip steel->Number of steel blocks of varying period cyc Obtaining the roller force change value FB of each frame chg ；
Step four, constructing a model of the relation between the roll shifting variable quantity and the roll bending force variable value to obtain an equivalent roll shifting quantity delta S and a set roll shifting quantity S after roll bending change norm ；
And fifthly, judging whether the roller shifting condition is met, and if so, shifting the roller according to the model constructed in the fourth step.
The judging flow of the fifth step is shown by referring to fig. 1, after the roll replacement or calibration is finished, each piece of steel starts to check whether the batch of strip steel with the same width exists in the rolling plan, if the quantity of strip steel with the same width exceeds a certain quantity, the roll bending-roll shifting change function is started, and the roll bending force and the roll shifting quantity are output; and after the last piece of steel in the same width period is executed, entering into normal roller shifting. And continuously executing the roll bending-roll shifting function when the number of the new rolled steel strips with the same width meeting the conditions is detected. Specifically, the method comprises the following steps:
s1, judging whether the following slabs have continuous same-width slabs or not and the number of the continuous same-width slabs; judging whether each slab is the same-width slab or not after roll replacement or calibration is finished, and accumulating the number of the same-width slabs;
s2, if the number of the subsequent continuous same-width blanks does not exceed the preset same-width threshold numberThe circulating roller shifting function is not started; if the number of the subsequent continuous plate blanks with the same width exceeds the threshold number with the same width>The circulating roller shifting function is started;
s3, judging whether the number of the follow-up same-width boards is larger than the number of the residual circulationIf yes, ->And the circulating roller shifting function is always started; if no, then->Enter into the circulating roller shifting function and execute until The circulation is jumped out, and the circulation roller-shifting function is terminated.
Wherein the number of slabs with the same width is smaller than the threshold number with the same widthIf BFM (i) Absence or Abs (B) FM(0) －B FM(i) )≥△B thd Then->Enter into the circulation roller shifting function B FM(0) For forming the current strip steelWidth of product B FM(i) For the width of the finished product of the lower coiled steel, delta B thd Is the same width judgment condition.
In this embodiment, the magnitude of the roll bending force variation of each frameThe data are stored in a database table and divided according to the steel grade, thickness and width progress, and can be synchronously modified with the database in real time on a human-computer interface of the HMI. See in particular Table 1
Table 1: bending roller force change amplitude meter
In order to ensure that the roll bending force variation quantity and the variation direction of each frame are inconsistent, the local abrasion area of each roller which is originally fixed can be avoided, the section shape of the strip steel is smoother, and the roll bending force variation adopts sinusoidal variation. Meanwhile, each rack is provided with an offset preset table, and the offset preset table can be in a database or can be synchronized with the database on a human-machine interface of the HMI and modified in real time, and particularly shown in table 2.
Table 2: sinusoidal variation offset preset table
The bending force variation amplitude, the bending variation offset number and the variation period belt steel block number are taken as sine function parameters to obtain the bending force variation value of each frame, a sine function related to the bending force variation is constructed, wherein N is rolled : the number of rolled strip steel is periodically changed by bending rolls, +.>Presetting the number of offset strip steel N cyc : number of steel blocks in one variation period, FB chg : roll force variation value ++>Original roll force, FB norm The roll bending force is set.
Determining a conversion relation between bending force and channeling: Δs= -K FB chg ，
Wherein: k=a (D/D 0 ) B *(b/B 0 ) C A, B, C are coefficients, preferably a=0.034025, b= -0.617852, c=1.338651, d: work roll diameter, D 0 : maximum diameter of work roll, b: width of strip steel B 0 : back-up roll length, Δs: equivalent roll shifting amount after roll bending change S norm : the roll shifting amount is set,original roll shifting amount.
According to the control method for the roll shifting of the hot continuous rolling CVC working roll, each slab can trigger a calculation program of the circulating roll shifting function when the slab reaches the furnace end, and the program can judge whether the follow-up slab has continuous slabs with the same width and the number of the continuous slabs with the same width. If the number of the subsequent continuous same-width blanks does not exceed the same-width threshold numberThe circulating roller shifting function is not started; if the number of the subsequent continuous plate blanks with the same width exceeds the threshold number with the same width>The circulating roll shifting function is started. The slab with the circulation roller shifting function is started, which indicates that the number of the follow-up slabs with the same width is more, thus setting the residual circulation number +.>Making a judgment if the number of the subsequent boards with the same width is greater than + ->In the first place->And the circulating roller shifting function is always started; if the number of the subsequent boards with the same width is less than +.>Then->And enter the start-up circulation roller shifting function until +.>The circulation is jumped out, and the circulation roller shifting function is stopped.
It should be noted that each slab reaching the furnace end needs to trigger a calculation program of the circulating roller shifting function and judge the condition of continuous same width of the subsequent slabs. Every time a slab reaches the furnace end, the slab is the current block, and the slab which is discharged before has no relation, and only the number of the subsequent continuous slabs with the same width is searched in the procedure.
The existing hot continuous rolling CVC roller type working roller provides large and stable plate shape control capability through the movement of the working roller, and can quickly achieve the target plate shape in the specification jump process. However, in the same width rolling process, the specifications are the same, the convexity of the effective strip steel is fixed, and the working roll lacks a target power source for movement, so that the position of the moving roll is relatively fixed. The embodiment provides a control method for channeling of a hot continuous rolling CVC working roll, which comprises the steps of periodically adjusting a bending roll set value in a rolling period for strip steel rolled in the same width, simultaneously providing a channeling coordinated change model, expanding the working channeling stroke, achieving the effect of uniform wear of the roll and improving the rolling mileage; and (3) rolling strip steel with different widths, fixing the bending force of each frame, and executing normal travel of the channeling rolls to maintain rolling stability under width jump. By adopting the control method of the embodiment, the running distance of the working rolls is increased by 30-60 mm during the same-width rolling, and the kilometer number of the same-width rolling is obviously increased.
The invention and its embodiments have been described above by way of illustration and not limitation, and the invention is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present invention.
Claims (5)
1. A control method for hot continuous rolling CVC working roll shifting is characterized by comprising the following steps: comprises the steps of,
step one, configuring bending force variation amplitude values for all frames of finish rolling
Step two, configuring preset offset strip steel numbers for each frame of the finish rolling
Step three, according to the change amplitude of the bending forcePresetting the number of offset strip steel->Number of steel blocks of varying period cyc Obtaining the roller force change value FB of each frame chg ；
Step four, constructing a model of the relation between the roll shifting variable quantity and the roll bending force variable value to obtain an equivalent roll shifting quantity delta S and a set roll shifting quantity S after roll bending change norm ；
Judging whether the roller shifting condition is met, and if so, shifting the roller according to the model constructed in the fourth step;
wherein, in the fifth step, the specific step of judging the roller shifting condition is that,
s1, judging whether the following slabs have continuous same-width slabs or not and the number of the continuous same-width slabs;
s2, if the judgment result does not exceed the preset same-width threshold numberThe circulating roller shifting function is not started; if the judgment result exceeds the same width threshold number +.>Starting a circulating roller shifting function and entering a step S3;
s3, continuously judging whether the number of the follow-up same-width boards is larger than the number of the residual circulationIf yes, ->And the circulating roller shifting function is always started; if no, then->Enter into the circulation roller shifting function until +.>Jumping out of the circulation to terminate the circulation roller shifting function;
in the fourth step, the conversion relation between the roll shifting variable quantity and the roll bending force variable value is as follows: Δs= -K FB chg ，Wherein k=a (D/D 0 ) B *(b/B 0 ) C A, B, C are coefficients, d: work roll diameter, D 0 : maximum diameter of work roll, b: width of strip steel B 0 : back-up roll length, Δs: equivalent roll shifting quantity after roll bending change, FB chg : the change value of the bending force S norm : setting the roll shifting amount and the roll shifting amount>Original roll shifting amount;
roll force variation valueThe roll bending force is setWherein (1)>For the magnitude of the change of the bending force, N rolled : the number of rolled strip steel is periodically changed by bending rolls, +.>Presetting the number of offset strip steel N cyc : the number of steel blocks in a variation period, < >>Original roll force, FB norm The roll bending force is set.
2. The method for controlling the roll shifting of the hot continuous rolling CVC working roll according to claim 1, wherein the method comprises the following steps of: the specific judging process in step S1 is that after roll changing or calibration is finished, judging whether each slab is the same-width slab, accumulating the quantity of the same-width slabs, and when the accumulated quantity reaches the same-width threshold quantityWhen in use, the circulating roller shifting work is startedCan be used.
3. The control method for hot continuous rolling CVC work roll shifting according to claim 2 is characterized by comprising the steps of: in step S3, the number of plate blanks with the same width is smaller than the threshold number with the same widthIf BFM (i) Absence or Abs (B) FM(0) －B FM(i) )≥△B thd ThenEnter into a circulating roller shifting function, wherein B FM(0) For the width of the current strip steel finished product, B FM(i) For the width of the finished product of the lower coiled steel, delta B thd Is the same width judgment condition.
4. A method for controlling roll shifting of a hot continuous rolling CVC work roll according to claim 3 where the magnitude of roll bending force variation of each frameAccording to the steel grade, thickness and width progress division, wherein the bending force change amplitude of the F1 frame is 300, the bending force change amplitude of the F2 frame is 300, the bending force change amplitude of the F3 frame is 300, the bending force change amplitude of the F4 frame is 300, the bending force change amplitude of the F5 frame is 400, the bending force change amplitude of the F6 frame is 400, and the bending force change amplitude of the F7 frame is 400.
5. The method for controlling the roll shifting of the hot continuous rolling CVC working roll according to claim 4, wherein the method comprises the following steps of: preset offset strip steel number of each frameThe preset values are respectively that the preset offset strip steel number of the F1 frame is 4, the preset offset strip steel number of the F2 frame is 9, the preset offset strip steel number of the F3 frame is 3 and the preset offset strip steel number of the F4 frame is 37, the preset offset strip steel number of the F5 frame is 5, the preset offset strip steel number of the F6 frame is 1, and the preset offset strip steel number of the F7 frame is 4.
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| CN1082851C (en) * | 1994-07-08 | 2002-04-17 | 石川岛播磨重工业株式会社 | Rolling method using both displacement and bending of roller, rolling machine and roller used for same |
| JP3301393B2 (en) * | 1998-09-02 | 2002-07-15 | 住友金属工業株式会社 | Plate shape control method using multiple rolling mills |
| CN100463735C (en) * | 2005-03-25 | 2009-02-25 | 鞍钢股份有限公司 | Work roll profile with both profile control and free schedule rolling |
| CN102310089B (en) * | 2011-09-21 | 2013-08-14 | 首钢总公司 | Method for eliminating local wear of working roller of CVC (continually variable crown) mill |
| CN102581026B (en) * | 2012-01-18 | 2013-11-20 | 中冶南方工程技术有限公司 | Control method for transverse integrative optimization of shape of cold rolled steel strip |
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| CN106140829B (en) * | 2015-03-27 | 2019-03-26 | 上海梅山钢铁股份有限公司 | The method for preventing hot-strip from generating local high spot based on CVC roller shape |
| CN108213087B (en) * | 2018-01-08 | 2019-05-03 | 东北大学 | A method of dispersion CVC working roll roll shifting position |
| CN109759453B (en) * | 2019-03-05 | 2021-06-08 | 马鞍山钢铁股份有限公司 | Strip shape control method for dynamically changing width of strip steel of cold continuous rolling mill into specification |
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