CN104772341A - Optimal setting method for bending roller of hot-continuous-rolling finishing mill set - Google Patents
Optimal setting method for bending roller of hot-continuous-rolling finishing mill set Download PDFInfo
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- CN104772341A CN104772341A CN201510214702.4A CN201510214702A CN104772341A CN 104772341 A CN104772341 A CN 104772341A CN 201510214702 A CN201510214702 A CN 201510214702A CN 104772341 A CN104772341 A CN 104772341A
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- force
- bending roller
- roll
- rolling
- roller force
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/08—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring roll-force
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Abstract
An optimal setting method for a bending roller of a hot-continuous-rolling finishing mill set relates to the field of flatness control of hot-rolled strip steel and solves the problem that only the flatness control needs of the head part of the hot-rolled strip steel are considered for setting the force of the bending roller in the prior art. The optimal setting method of the bending roller disclosed by the invention takes the full-length rolling process of the strip steel into consideration. According to the actual rolling force and convexity change situation of a most-recently rolling process of strip steel of a same steel specification, the bending roller force change value needed by full-length real-time flatness control of the present strip steel can be calculated in advance; in combination with the equipment capacity limit of the bending roller, the bending roller force adjustment amount necessary for flatness control of the middle and tail parts of the strip steel is reserved. Instead of setting the bending roller force around a balanced force simply, the method reserves the needed bending roller capacity in advance according to the bending roller force adjustment amount necessary for the whole rolling process, thereby utilizing the equipment capacity of the bending roller maximally. According to the optimal setting method disclosed by the invention, the bending roller capacity needed by the whole full-length rolling process of the hot-rolled strip steel is considered, so that the good full-length flatness of the strip steel is ensured finally.
Description
Technical field
The present invention relates to Flatness of Hot Rolled Strip control field, particularly relate to a kind of Optimal Setting method of continuous hot-rolling mill mm finishing mill unit bending roller force.
Background technology
In hot continuous rolling fine-rolling strip steel production process, be with the plate shape setting of steel and control mainly through " roll shifting+roller " or " pair roller intersection+roller " with the use of realizing.No matter adopt which kind of combination above, the core content of shape models setting is all the target convexity that will ensure fine-rolling strip steel, guarantee that finish rolling each rack outlet strip steel head glacing flatness is good, and convexity with afterbody in steel and glacing flatness mainly rely on the real-time adjustment of bending roller force to ensure simultaneously.
Usual continuous hot-rolling mill is when using " roll shifting+roller " configuration mode, Strip Shape Control model needs the convexity reached to calculate its roll shifting position and bending roller force according to strip steel head at each rack outlet of finish rolling, first ensure that roller is set near equilibrant force as far as possible, then calculate the roll shifting position of its correspondence.Here two important control thoughts are comprised, one: the setting of roll shifting and roller is that the rolling technological parameter such as temperature, roll-force according to strip steel head calculates, and other positions such as tail in band steel cannot be considered, its two: ensure that roller is set near equilibrant force as far as possible, unless roll shifting position is to the limit, strip steel head roller can be made like this to change as small as possible, ensure stable.That is, current usual way is exactly is that target carries out roller setup control with strip steel head, and not to consider in the rolling of band steel total length other positions such as afterbody.But due to finish rolling entrance intermediate blank head and tail temperature difference can cause front several machine frame head tail roll-force difference comparatively large (as F1 frame sometimes end to end roll-force differ from about 1000 tons), during belt steel rolling, the difference of roll-force can cause roll sag to occur great changes end to end, in order to overcome the change of this rack outlet convexity therefore brought in time, need corresponding bending roller force to compensate the change of this part convexity, if but bending roller force is set near equilibrant force, no matter increase and decrease, all only has almost half scope of bending roller force capacity of equipment, once fail close to the limit to increase and decrease bending roller force in time, forebay strip profile can be made to alter a great deal, finishing mill intermediate stand is caused to occur flatness defect, even occur rolling brokenly and the accident such as steel scrap, this phenomenon is particularly evident when rolling Ultra-thin band steel.
The patent No. is the patent of invention " utilizing feedback data to improve the method for milling train plate shape setting and Dynamic controlling precision " of CN201210110506, mainly by board form data that finish rolling outlet instruments detects, the plate shape setting precision of follow-up band steel is improved by Model Self-Learning, and pass through the preferentially process of instrumented data, be the confidence level and the accuracy that improve Model Self-Learning data.Patent " cold rolled sheet shape initialization calculate in the processing method of incoming hot rolled slab convexity ", mainly through providing reference to the segment processing of incoming hot rolled slab convexity for cold rolled sheet shape controls setting, improves the accuracy of cold rolled sheet shape initialization.When these methods all do not consider to be with other position rollings such as tail in steel bending roller force close to or processing scheme when reaching the roller capacity of equipment limit, all the same with usual method, only consider for strip steel head.
Summary of the invention
The object of the invention is to solve prior art Problems existing, a kind of Optimal Setting method of hot-tandem unit roller is provided, the method is considered the band steel total length operation of rolling, according to the last time with the actual roll-force of steel grade specification strip steel and convexity situation of change, this block of budget band steel is used for the bending roller force changing value that plate shape controls in real time, in conjunction with the capacity of equipment limit of bending roller force, it is the bending roller force regulated quantity that Strip Shape Control reserves that in band steel, afterbody needs during setting bending roller force, instead of simple consideration is set near equilibrant force, but according to the bending roller force regulated quantity that the whole operation of rolling may need, reserve the roller ability of needs in advance, maximally utilise roller capacity of equipment.That is, the technical program considers the roller ability that the whole operation of rolling of hot-strip total length needs, and final guarantee is with steel total length plate shape well, and not only for strip steel head.
The object of the invention is to be achieved through the following technical solutions:
An Optimal Setting method for hot-tandem unit roller, comprises the following steps:
S1, calculate initial bending roller force and roll shifting position setting value according to shape models:
To finish rolling F
iframe, the initial bending roller force setting value calculated by shape models is B
i0, roll shifting position setting value is S
i0, roll shifting position B
i0with bending roller force S
i0the equal proportion convexity requirement of finish rolling each rack outlet band steel need be met; And S
i0require within roll shifting stroke range, and B
i0usually, near roller equilibrant force, when roll shifting position is by the restriction of adjacent belts steel roll shifting stroke, for meeting the requirement of equal proportion convexity, setting bending roller force can depart from equilibrant force;
S2, obtain the last rolling with steel grade specification strip steel F
ithe variable quantity of the actual roll-force of frame:
According to the last time with F during the rolling of steel grade specification strip steel
ithe actual roll-force data of frame, band steel total length is divided into N section, and every section of roll-force gets the average of all data in its section, then total N number of rolling force value, finds out the difference DELTA F of maximum and first paragraph roll-force in N number of data
i, namely
ΔF
i＝max{F
i1,F
i2,…,F
iN}-F
i1
Wherein F
ij(j=1,2 ..., N) and represent F
iactually the roll-force of frame jth section, Δ F
igenerally be no more than 1200 tons, carry out amplitude limit accordingly;
S3, calculate bending roller force to convexity, bending roller force to roll-force, roll shifting position to bending roller force three sensitivity coefficients:
According to convexity function C=f (F, B, S, W, T), wherein C is Gap crown, and F is roll-force, and B is bending roller force, and S is roll shifting position, and W is roll wear value, and T is thermal expansion of rollers, tries to achieve the sensitivity coefficient of bending roller force to convexity accordingly
bending roller force is to the sensitivity coefficient of roll-force
roll shifting position is to the sensitivity coefficient of bending roller force
S4, select corresponding roll-force confidence level according to different rolling operating mode: the roll-force confidence level remembering this steel grade specification is α, 0< α≤1, and generally get about 0.9, the difference depending on operating mode and supplied materials change suitably adjusts;
In S5, this block of budget band steel total length operation of rolling during Strip Shape Control because roll-force changes the bending roller force regulated quantity caused:
S6, obtain the last rolling with steel grade specification strip steel F
ithe convexity variable quantity of frame:
According to the convexity data of the last time with rack outlet during the rolling of steel grade specification strip steel, band steel total length is divided into N section, and every section of convexity data get average, then total N number of convex value, finds out the difference DELTA C of maximum and first paragraph convex value in N number of data
i, namely
ΔC
i＝max{C
i1,C
i2,…,C
iN}-C
i1
Wherein C
ij(j=1,2 ..., N) and represent F
ithe convex value of frame jth section, Δ C
ibe no more than 40 microns, carry out limited amplitude protection accordingly;
S7, select convexity confidence level according to different rolling operating mode, remember that the convexity confidence level of this steel grade specification is β, 0< β≤1, generally get about 0.95, the difference depending on operating mode and supplied materials change suitably adjusts;
Change because finish rolling exports convexity the bending roller force regulated quantity caused during Strip Shape Control in S8, this block of budget band steel total length operation of rolling:
Total bending roller force regulated quantity in S9, this block of precomputation band steel total length operation of rolling required for Strip Shape Control: Δ B
total=Δ B
i1+ Δ B
i2;
S10, roller equipment limit capacity check:
If bending roller force required in this block band steel total length operation of rolling of budget does not exceed the maximum bending roller force B of the equipment limit
max, i.e. B
i0+ Δ B
total≤ B
max, then initial bending roller force setting value B is got
i0with roll shifting position setting value S
i0as final setting value; If required bending roller force exceedes equipment limit bending roller force, i.e. B in the operation of rolling of budget
i0+ Δ B
total>B
max, then need to optimize initial bending roller force setting value, by B
max-Δ B
totalas final bending roller force setting value, will
as final roll shifting position setting value.
Beneficial effect of the present invention:
Contrast traditional continuous hot-rolling mill roller setting technique, present invention, avoiding conventional art and only consider that strip steel head carries out the shortcoming of roller setting.Considering the setting basis that hot-strip total length roller controls to need being carried out bending roller force, under identical device hardware condition, roller capacity of equipment can be made in theory to improve 100%, roller capacity of equipment in actual production, can be made to improve about 50% to 80%.
Accompanying drawing explanation
Fig. 1 is the flow chart of hot-tandem unit roller Optimal Setting method of the present invention;
Fig. 2 is the coherent detection instrument that band steel segmentation and milling train are installed;
Fig. 3 is each bending roller force regulated quantity in total length process when getting initial bending roller force setting value rolling band steel, calculates bending roller force and actual bending roller force change curve;
Each bending roller force regulated quantity, calculating bending roller force and actual bending roller force change curve in total length process when Fig. 4 is the bending roller force setting value rolling band steel after getting optimization.
Detailed description of the invention
Accompanying drawing below in conjunction with embodiment is described in detail to the specific embodiment of the present invention.
Be described for F1 milling train in certain hot continuous rolling finish rolling F1-F7 frame.Be provided with pressure-measuring head 4 under this continuous hot-rolling mill (four-high mill) supporting roller bearing seat, one-sided range is 2200 tons, to detect roll-force in the operation of rolling; At four-high mill entrance, pyrometer 3 and laser velocimeter 2 are installed, pyrometer range 600 ~ 1200 DEG C; Utilize the speed of laser velocimeter measuring tape steel, intermediate blank is divided into N section, such as every 1 meter is divided into one section, records the average roll-force of every section, and realize roll-force fragmented storage, as shown in Figure 2 in the operation of rolling.
Four-high mill is equipped with positive roll-bending cylinder, maximum bending roller force 300 tons, is equipped with working roll roll shifting, roll shifting cylinder stroke 150mm.The certain roll forming of four-high mill work roller strap, realizes the continuous variable of Gap crown by working roll roll shifting.
Concrete computational process is as follows:
(1) initial bending roller force setting value B is calculated according to shape models
10=160 tons and roll shifting position setting value S
10=-20mm;
(2) F of the last rolling with steel grade specification strip steel is obtained
1roll-force variation delta F
1it is 750 tons;
(3) bending roller force to bending roller force three sensitivity coefficients, can be asked according to convexity function roll-force, roll shifting position convexity, bending roller force
with
(4) the Δ F of this steel grade specification is got
1confidence level be 0.9;
(5) because roll-force change causes bending roller force regulated quantity when this block of budget belt plate shape controls
" because roll-force changes the bending roller force regulated quantity curve caused " as shown in Figure 3;
(6) the Δ C of the last rolling with steel grade specification strip steel is got
1=9.5 μm;
(7) select convexity confidence level, get the Δ C of this steel grade specification
1confidence level 0.95;
(8) because finish rolling outlet convexity changes the bending roller force regulated quantity caused when this block of budget belt plate shape controls
" because convexity changes the bending roller force regulated quantity curve caused " as shown in Figure 3;
(9) bending roller force during this block of precomputation belt steel rolling required for Strip Shape Control regulates Δ B
total=Δ B
11+ Δ B
12=154.85 tons;
(10) equipment limit check.Owing to being B
10+ Δ B
total>B
maxas shown in Figure 3, the total bending roller force (" calculating bending roller force " in Fig. 3) calculated during afterbody in rolling will exceed the maximum bending roller force limit, and when making middle afterbody rolling, actual bending roller force is to the upper limit, causes middle the foot section brought steel can not ensure by equal proportion Crown control plate shape.Therefore by B
max-Δ B
totalas final bending roller force setting value, incite somebody to action for=145.15 tons
as final roll shifting position setting value, as shown in Figure 4.
Adopt the bending roller force setting value after optimizing, the bending roller force calculated during afterbody in rolled band steel still can in maximum bending roller force limit range, as shown in Figure 4, thus in guarantee rolled band steel during afterbody plate shape keep function and automatic Crown control can normal regulating bending roller force, afterbody plate shape in band steel is effectively ensured.
Those of ordinary skill in the art will be appreciated that, above embodiment is only used to object of the present invention is described, and be not used as limitation of the invention, as long as in essential scope of the present invention, the change of the above embodiment, modification all will be dropped in the scope of claim of the present invention.
Claims (5)
1. an Optimal Setting method for hot-tandem unit roller, is characterized in that comprising the following steps:
S1, calculate initial bending roller force and roll shifting position setting value according to shape models:
To finish rolling F
iframe, the initial bending roller force setting value calculated by shape models is B
i0, roll shifting position setting value is S
i0, roll shifting position B
i0with bending roller force S
i0the equal proportion convexity requirement of finish rolling each rack outlet band steel need be met; And S
i0require within roll shifting stroke range;
S2, obtain the last rolling with steel grade specification strip steel F
ithe variable quantity of the actual roll-force of frame:
According to the last time with F during the rolling of steel grade specification strip steel
ithe actual roll-force data of frame, band steel total length is divided into N section, and every section of roll-force gets the average of all data in its section, then total N number of rolling force value, finds out the difference DELTA F of maximum and first paragraph roll-force in N number of data
i, namely
ΔF
i＝max{F
i1,F
i2,…,F
iN}-F
i1
Wherein F
ij(j=1,2 ..., N) and represent F
iactually the roll-force of frame jth section;
S3, calculate bending roller force to convexity, bending roller force to roll-force, roll shifting position to bending roller force three sensitivity coefficients:
According to convexity function C=f (F, B, S, W, T), wherein C is Gap crown, and F is roll-force, and B is bending roller force, and S is roll shifting position, and W is roll wear value, and T is thermal expansion of rollers, tries to achieve the sensitivity coefficient of bending roller force to convexity accordingly
bending roller force is to the sensitivity coefficient of roll-force
roll shifting position is to the sensitivity coefficient of bending roller force
S4, select corresponding roll-force confidence level according to different rolling operating mode, remember that the roll-force confidence level of this steel grade specification is α, 0< α≤1;
In S5, this block of budget band steel total length operation of rolling during Strip Shape Control because roll-force changes the bending roller force regulated quantity caused:
wherein Δ B
i1for changing because of roll-force the bending roller force regulated quantity caused;
S6, obtain the last rolling with steel grade specification strip steel F
ithe convexity variable quantity of frame:
According to the convexity data of the last time with rack outlet during the rolling of steel grade specification strip steel, band steel total length is divided into N section, and every section of convexity data get average, then total N number of convex value, finds out the difference DELTA C of maximum and first paragraph convex value in N number of data
i, namely
ΔC
i＝max{C
i1,C
i2,…,C
iN}-C
i1
Wherein C
ij(j=1,2 ..., N) and represent F
ithe convex value of frame jth section;
S7, select convexity confidence level according to different rolling operating mode, remember that the convexity confidence level of this steel grade specification is β, 0< β≤1;
Change because finish rolling exports convexity the bending roller force regulated quantity caused during Strip Shape Control in S8, this block of budget band steel total length operation of rolling:
wherein Δ B
i2for changing because of convexity the bending roller force regulated quantity caused;
Total bending roller force regulated quantity in S9, this block of precomputation band steel total length operation of rolling required for Strip Shape Control: Δ B
total=Δ B
i1+ Δ B
i2;
S10, roller equipment limit capacity check:
If bending roller force required in this block band steel total length operation of rolling of budget does not exceed the maximum bending roller force B of the equipment limit
max, i.e. B
i0+ Δ B
total≤ B
max, then initial bending roller force setting value B is got
i0with roll shifting position setting value S
i0as final setting value; If required bending roller force exceedes equipment limit bending roller force, i.e. B in the operation of rolling of budget
i0+ Δ B
total>B
max, then need to optimize initial bending roller force setting value, by B
max-Δ B
totalas final bending roller force setting value, will
as final roll shifting position setting value.
2. hot-tandem unit roller Optimal Setting method as claimed in claim 1, is characterized in that:
In described step S2, roll-force variable quantity is no more than 1200 tons.
3. hot-tandem unit roller Optimal Setting method as claimed in claim 1, is characterized in that:
In described step S4, roll-force confidence level value is 0.9.
4. hot-tandem unit roller Optimal Setting method as claimed in claim 1, is characterized in that:
Described step S6 camber variation delta C
ibe no more than 40 microns.
5. hot-tandem unit roller Optimal Setting method as claimed in claim 1, is characterized in that:
Described step S7 camber confidence level value is 0.95.
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|---|---|---|---|
| CN201510214702.4A CN104772341B (en) | 2015-04-28 | 2015-04-28 | A kind of Optimal Setting method of hot-tandem unit roller |
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|---|---|---|---|
| CN201510214702.4A CN104772341B (en) | 2015-04-28 | 2015-04-28 | A kind of Optimal Setting method of hot-tandem unit roller |
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|---|---|
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| CN104772341B CN104772341B (en) | 2016-08-10 |
Family
ID=53614282
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106623441A (en) * | 2016-12-13 | 2017-05-10 | 山东钢铁股份有限公司 | Method for controlling finish rolling roll bending force on tail of hot-rolled strip |
| CN108339857A (en) * | 2017-01-22 | 2018-07-31 | 宝山钢铁股份有限公司 | A kind of profile regulation method of rolling thickening plate |
| CN108405630A (en) * | 2018-02-27 | 2018-08-17 | 首钢京唐钢铁联合有限责任公司 | A kind of control method and device of belt plate shape |
| CN108500067A (en) * | 2018-04-11 | 2018-09-07 | 攀钢集团攀枝花钢钒有限公司 | The plate shape method of adjustment of hot-continuous-rolling strip steel |
| CN112170502A (en) * | 2020-09-16 | 2021-01-05 | 太原理工大学 | Method for predicting roll bending force in rolling process |
| CN114472542A (en) * | 2022-01-19 | 2022-05-13 | 湖南华菱涟钢特种新材料有限公司 | Method, device and equipment for controlling plate shape in production process of hot-rolled strip steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106623441A (en) * | 2016-12-13 | 2017-05-10 | 山东钢铁股份有限公司 | Method for controlling finish rolling roll bending force on tail of hot-rolled strip |
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| CN112170502A (en) * | 2020-09-16 | 2021-01-05 | 太原理工大学 | Method for predicting roll bending force in rolling process |
| CN114472542A (en) * | 2022-01-19 | 2022-05-13 | 湖南华菱涟钢特种新材料有限公司 | Method, device and equipment for controlling plate shape in production process of hot-rolled strip steel |
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|---|---|
| CN104772341B (en) | 2016-08-10 |
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