CN110479760A - Disconnected band is prevented when cold continuous rolling dynamic variable specification steel band and loses the roll gap compensation method opened - Google Patents
Disconnected band is prevented when cold continuous rolling dynamic variable specification steel band and loses the roll gap compensation method opened Download PDFInfo
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- CN110479760A CN110479760A CN201810256703.9A CN201810256703A CN110479760A CN 110479760 A CN110479760 A CN 110479760A CN 201810256703 A CN201810256703 A CN 201810256703A CN 110479760 A CN110479760 A CN 110479760A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/28—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
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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
- B21B37/58—Roll-force control; Roll-gap control
Abstract
The present invention relates to prevent disconnected band when a kind of cold continuous rolling dynamic variable specification steel band and lose the roll gap compensation method opened, the following steps are included: calculating the average value of the roller diameter of the upper and lower working roll of each rack, calculate the working roll contact length of each rack, calculate the mill stiffness of each rack, calculate the setting gap values between rollers of each rack, calculate the setting roll gap deviation of each rack, then the roll gap adjusted value of each rack is set, FGC control model is finally enabled, roll gap is adjusted according to the roll gap adjusted value of each rack.Roll gap adjustment amount leads to greatly very much disconnected band or loses the problem of opening when this method can solve dynamic variable specification, so as to improve rolling stability.
Description
Technical field
The present invention relates to roll gap compensation methodes when a kind of cold continuous rolling dynamic variable specification, belong to cold continuous rolling rolling technique neck
Domain.
Background technique
Cold rolling mill sour rolling mill is since operation, the disconnected band of milling train front and back band steel dynamic variable specification (calling FGC in the following text) and mistake one
It is directly to perplex the main problem of milling train production, and plum steel acid rolls that products export thickness span is big, in the tin plating of rolling thin gauge
Very high to the requirement of model FGC roll gap setting accuracy when panel products, T4 is transitioned into T5 frequent occurrence or T5 is transitioned into during T4
Disconnected band occurs or loses to open, the production capacity for seriously affecting sour rolling mill plays and unit lumber recovery, constantly mentions as acid rolls thin material ratio
Height, milling train and mistake change specification number are frequent, and milling train dynamic variable specification problem seems especially prominent.
The value that acid rolls basic settings model computing function front and back band steel unit tension calculated, exit thickness and roll gap can
To determine whether use the function of FGC in weld seam control.If the unit tension of the strip of front and back two changes, exit thickness becomes
Change and roll gap variation is all in a small range, then computer decides that the material of the strip of front and back two and specification are not all sent out
Raw big variation, goes out in weld seam and controls still through AGC, otherwise will start FGC control function.The roll gap calculating of FGC is entire
FGC controls the part of most critical, because FGC control is carried out after dynamic setting control and in the case where AGC control cutting
, the thickness control of strip is controlled by FGC completely during this, precision that the roll gap of FGC calculates be determine FGC at
Crucial factor whether function.
Summary of the invention
The invention solves technical problems to be: the shortcomings that overcoming above-mentioned technology, providing one kind can solve dynamic variable specification
When roll gap adjustment amount the problem of leading to very much disconnected band greatly or losing and can be improved the breast roll of rolling stability compensation method sew and mend.
In order to solve the above-mentioned technical problem, technical solution proposed by the present invention is: a kind of cold continuous rolling dynamic variable specification steel band
When the roll gap compensation method that prevents disconnected band and lose, this method uses five racks, six roller cold continuous rolling, comprising the following steps:
The average value of the first step, the roller diameter of each upper and lower working roll of rack of calculating:
R (i)=(rt (i)+rb (i))/2,
Wherein, i={ 1,2,3,4,5 }, rt (i), rb (i) are respectively the roller diameter of the upper and lower working roll of the i-th rack；
Second step, the working roll contact length for calculating each rack
x(i)=2*shift(i)+sb
Wherein, sb is strip width, shift(i) be the i-th rack intermediate calender rolls roll shifting amount；
Third step, the mill stiffness for calculating each rack
k(i)=p1(i)*log(x(i))-p2(i)+p3(i)*(r(i)-1300)
Wherein, p1 (i), p2 (i), the Rigidity Calculation parameter that p3 (i) is the i-th machine frame rolling mill, the calculating of p1 (i), p2 (i), p3 (i)
Method is the prior art.
4th step, the setting gap values between rollers for calculating each rack
s(i)=h(i)-f(i)/k(i)+sz0(i)+s0(i)；
Wherein, h (i) is the exit thickness of the i-th rack strip, and f (i) is the roll-force of the i-th machine frame rolling mill, and k (i) is the i-th rack
Mill stiffness, sz0 (i) be compared with roller when the i-th rack hydraulic working roll cylinder position, i.e., relative to work zero-bit pressure rolling row
Journey, the gap values between rollers of the i-th rack when s0 (i) is compared with roller；
5th step, the roll gap deviation for calculating each rack
△DS(i)=Sc(i)-Sn(i)
Wherein, Sc (i) is the setting roll gap of preceding strip, and Sn (i) is the setting roll gap of rear strip；
The roll gap adjusted value of 6th step, each rack of setting
When forward and backward strip by thickness to it is thin, by it is soft to firmly and by width to it is narrow when, if the roll gap deviation of the forward and backward strip of the i-th rack
△ DS (i)<0 and | △ DS (i) |>| △ H (i) |, at this time easily occur strip break band, enable △ DS (i)=- | △ H (i) |/2 pairs of roll gap
It compensating, i.e. the roll gap adjusted value of the i-th rack is-| △ H (i) |/2；When forward and backward strip by it is thin to it is thick, by firmly to it is soft and by
When width arrives narrow, if roll gap deviation △ DS (i) > 0 of forward and backward strip and △ DS (i) > △ H (i), strip easily occurs at this time
It loses and opens, △ DS (i)=△ H (i)/2 pair roll gap is enabled to compensate, is i.e. the roll gap adjusted value of the i-th rack is △ H (i)/2；
Wherein, △ H (i) is the deviation of the forward and backward strip exit thickness of the i-th rack；
7th step enables FGC control model, is adjusted according to the roll gap adjusted value of each rack to roll gap.
The invention has the beneficial effects that: the roll gap calculating of dynamic variable specification is the most critical part of entire FGC control,
Because FGC control is carried out in the case where the cutting of gauge automatic control AGC system, the thickness control of strip during this
The roll gap for depending entirely on FGC calculates, and the setting of roll gap adjustment amount is too much, then in the case where constant roll gap adjusts rate, roll gap tune
The whole time to lower a roll of target roll seam just extends, and the time of rack outlet thickness fluctuation is also just elongated, influences tension therewith, rolls
The fluctuation of power processed often causes the disconnected band of strip or loses to open under hightension effect.The present invention is for the disconnected band of FGC and loses the skill opened
Art problem, trace analysis occur disconnected band or lose the dynamic variable specification process data opened, and find out the strip exit thickness of each rack
Variation and the correlation between the excessive roll gap of forward and backward strip (the roll gap deviation of the forward and backward strip of rack), from the roll gap tune of rack
It is whole to start with, the roll gap compensation scheme of front and back band steel has been formulated, rolling stability when FGC control model can be greatly improved, has been had
The visible specific embodiment of the invention part of body contrast and experiment.
Specific embodiment
Embodiment one
The present invention of the present embodiment is applied in the automatic control of certain five rack of 1420mm, six roller cold continuous rolling, and milling train is set
Standby parameter is as shown in table 1:
Table 1
| Serial number | Device name | Parameter |
| 1 | Working roll size mm | φ435/φ385 X 1480 |
| 2 | Intermediate calender rolls size mm | φ490/φ440 X 1490 |
| 3 | Support roller size mm | φ1300/φ1150×1420 |
| 4 | Power of motor kw | 4600 |
| 5 | Motor speed rpm | 400/1200 |
| 6 | Intermediate roll shifting amount mm | 0/380 |
| 7 | Work roll bending KN | -180/400 |
| 8 | Intermediate roll bending KN | 10/500 |
Five racks, six roller cold continuous rolling is equipped with advanced detection instrument in the present embodiment, ensure that process control data source
Reliability.A laser velocimeter is configured before each rack, for measuring strip speed；Before and after 1st rack, before the 5th rack
A calibrator is respectively configured, two calibrators are configured after the 5th rack, for measuring strip interior thickness；Each rack configuration
Pressure sensor (the 1st, 5 racks also configure pressure-measuring head) is for measuring practical roll-force；Configured with tensometer for surveying between rack
Strip tension between amount rack.
Strip T4 (DP1451K1, rolling specs 0.231mm*773mm), rear strip T5 before the present embodiment
It is illustrated for (DP1651K2, rolling specs 0.211mm*731mm), the inlet thickness of forward and backward strip is all 2.0mm, is
It prevents from disconnected band and loses to compensate the roll gap of rack, specifically includes the following steps:
The average value of the first step, the roller diameter of each upper and lower working roll of rack of calculating:
R (i)=(rt (i)+rb (i))/2,
Wherein, i={ 1,2,3,4,5 }, rt (i), rb (i) are respectively the roller diameter of the upper and lower working roll of the i-th rack；
Second step, the working roll contact length for calculating each rack
x(i)=2*shift(i)+sb
Wherein, sb is strip width, shift(i) be the i-th rack intermediate calender rolls roll shifting amount；
Third step, the mill stiffness for calculating each rack
k(i)=p1(i)*log(x(i))-p2(i)+p3(i)*(r(i)-1300)
Wherein, p1 (i), p2 (i), the Rigidity Calculation parameter that p3 (i) is the i-th machine frame rolling mill, p3 (i) are constant 1, p1 (i) and p2
(i) be in milling train without under strip state, milling train at constant speed (500mpm or so), change intermediate roll shifting amount (0,95,
190,285,380), apply different roll-forces to milling train under each roll shifting amount state, be collected simultaneously the practical roller of 1-5 frame
Seam, by logarithmic formula k=p1 (i) * ln (x)-p2 (i), wherein x roll shifting amount, k remove roll gap deviation for rolling force deviation, each
Data of the rack under 5 roll shiftings are returned to obtain p1 (i) and p2 (i).P1 (i), p2 (i), p3 (i) calculation method be existing
There is technology, can refer to Chinese patent literature CN201310542581.7.
It is returned by measured data, obtains milling train p1, p2, p3 Rigidity Calculation parameter as shown in table 2 (× 105):
Table 2
| Shelf number | 1 | 2 | 3 | 4 | 5 |
| P1 | 1.24605 | 1.05085 | 1.18668 | 1.10423 | 1.22546 |
| P2 | 4.55586 | 3.24016 | 4.14101 | 3.59227 | 4.41291 |
| P3 | 1 | 1 | 1 | 1 | 1 |
4th step, the setting gap values between rollers for calculating each rack
s(i)=h(i)-f(i)/k(i)+sz0(i)+s0(i)；
Wherein, h (i) is the exit thickness of the i-th rack strip, and f (i) is the roll-force of the i-th machine frame rolling mill, and k (i) is the i-th rack
Mill stiffness, sz0 (i) be compared with roller when the i-th rack hydraulic working roll cylinder position, i.e., relative to work zero-bit pressure rolling row
Journey, the gap values between rollers of the i-th rack when s0 (i) is compared with roller；
Fixed value of roller slit is the deviation relative to preset reference roll gap, and the fixed value of roller slit of preceding strip is as shown in table 3:
Table 3
| Shelf number | 1 | 2 | 3 | 4 | 5 |
| Working roll roller diameter average value (mm) | 397.5 | 397.3 | 392.5 | 425.9 | 407.2 |
| Working roll contact length (mm) | 833 | 833 | 833 | 833 | 833 |
| Mill stiffness (10-3Ton) | 382247 | 382563 | 383819 | 383361 | 372873 |
| Exit thickness (mm) | 1.245 | 0.732 | 0.470 | 0.316 | 0.231 |
| Fixed value of roller slit (mm) | -0.338 | -1.279 | -0.772 | 0.59 | 0.758 |
The fixed value of roller slit of strip is as shown in table 4 afterwards:
Table 4
| Shelf number | 1 | 2 | 3 | 4 | 5 |
| Working roll roller diameter average value (mm) | 397.5 | 397.3 | 392.5 | 425.9 | 407.2 |
| Working roll contact length (mm) | 791 | 791 | 791 | 791 | 791 |
| Mill stiffness (10-3Ton) | 375800 | 377126 | 377680 | 377648 | 377643 |
| Exit thickness (mm) | 1.185 | 0.692 | 0.454 | 0.306 | 0.211 |
| Fixed value of roller slit (mm) | -0.617 | -1.503 | -0.766 | 0.978 | 0.354 |
5th step, the setting roll gap deviation for calculating each rack
△DS(i)=Sc(i)-Sn(i)
Wherein, Sc (i) is the setting roll gap of preceding strip, and Sn (i) is the setting roll gap of rear strip.
The setting roll gap deviation of each rack is as shown in secondary series in table 5:
Table 5
| Shelf number | 1 | 2 | 3 | 4 | 5 |
| Set roll gap deviation | -0.279 | 0.224 | 0.443 | 0.173 | 0.195 |
| Roll gap adjusted value | -0.03 | 0.248 | 0.441 | 0.168 | 0.189 |
The roll gap adjusted value of 6th step, each rack of setting
When forward and backward strip by thickness to it is thin, by it is soft to firmly and by width to it is narrow when, if the setting roll gap of the forward and backward strip of the i-th rack is inclined
Difference △ DS (i)<0 and | △ DS (i) |>| △ H (i) |, at this time easily occur strip break band, enable △ DS (i)=- | △ H (i) |/2, i.e.,
The roll gap adjusted value of i-th rack be-| △ H (i) |/2；
When forward and backward strip by it is thin to it is thick, by firmly to it is soft and by width to it is narrow when, if the setting roll gap deviation △ of forward and backward strip
Strip mistake easily occurs at this time, enables △ DS (i)=△ H (i)/2, the i.e. roller of the i-th rack by DS (i) > 0 and △ DS (i) > △ H (i)
Seam adjusted value is △ H (i)/2；Wherein, △ H (i) is the deviation of the forward and backward strip exit thickness of the i-th rack.
From the foregoing it will be appreciated that in the present embodiment forward and backward strip by thickness to it is thin, by soft to firmly and by width to narrow, and the i-th rack
The setting roll gap deviation △ DS (i)<0 of forward and backward strip, | △ DS (i) |>| △ H (i) |, at this time easily occur strip break band, i-th
The roll gap adjusted value of rack is-| △ H (i) |/2, the roll gap adjusted value of each rack is as shown in third column in table 5, with the 1st rack
For, △ DS(1)=- 0.617-(-0.338)=- 0.279, because of △ DS(1) < 0, calculate | △ DS(1) |=0.279, | △ H(1) |=
1.245-1.185=0.06 because | △ DS | > | △ H |, then enable △ DS=- | △ H |/2=- 0.03.
7th step enables FGC control model, according to the roll gap adjusted value (shown in third column in table 5) of each rack to roller
Seam is adjusted.
Embodiment two
The present embodiment and embodiment one the difference is that: in the 6th step, the roll gap adjusted value of 2-5 rack is 0, i.e., only adjusts
The gap values between rollers of whole 1st rack.That is, scheme implement after the transition roll gap of the 1st rack (roll gap of the forward and backward strip of rack is inclined
Difference) from -0.279mm become -0.03mm, it is ensured that and in the control process of FGC mode, the 1st rack outlet thickness thickens, i.e.,
Achieve the effect that prevent disconnected band.
Relative to embodiment one, the present embodiment only adjusts the roll gap of the 1st rack, has just reached the effect for preventing disconnected band and mistake
Fruit is tested through applicant, and since coming into operation, the disconnected band number of variable specification welding seam is reduced to monthly 1 time the program from every monthly average 8 times,
It loses a number to be reduced to monthly 0 time from every monthly average 6 times, rolls production capacity promotion for acid and be made that tremendous contribution.
The present invention is not limited to the above embodiment the specific technical solution, and in addition to the implementation, the present invention may be used also
There are other embodiments, such as prevent to lose embodiment when opening.For those skilled in the art, all at this
Within the spirit and principle of invention, the technical solution that any modification, equivalent replacement, improvement and so on are formed be should be included in
Within protection scope of the present invention.
Claims (2)
1. preventing disconnected band when a kind of cold continuous rolling dynamic variable specification steel band and losing the roll gap compensation method opened, this method uses five racks
Six roller cold continuous rollings, comprising the following steps:
The average value of the first step, the roller diameter of each upper and lower working roll of rack of calculating:
R (i)=(rt (i)+rb (i))/2,
Wherein, i={ 1,2,3,4,5 }, rt (i), rb (i) are respectively the roller diameter of the upper and lower working roll of the i-th rack；
Second step, the working roll contact length for calculating each rack
x(i)=2*shift(i)+sb
Wherein, sb is strip width, shift(i) be the i-th rack intermediate calender rolls roll shifting amount；
Third step, the mill stiffness for calculating each rack
k(i)=p1(i)*log(x(i))-p2(i)+p3(i)*(r(i)-1300)
Wherein, p1 (i), p2 (i), the Rigidity Calculation parameter that p3 (i) is the i-th machine frame rolling mill；
4th step, the setting gap values between rollers for calculating each rack
s(i)=h(i)-f(i)/k(i)+sz0(i)+s0(i)；
Wherein, h (i) is the exit thickness of the i-th rack strip, and f (i) is the roll-force of the i-th machine frame rolling mill, and k (i) is the i-th rack
Mill stiffness, sz0 (i) be compared with roller when the i-th rack hydraulic working roll cylinder position, i.e., relative to work zero-bit pressure rolling row
Journey, the gap values between rollers of the i-th rack when s0 (i) is compared with roller；
5th step, the setting roll gap deviation for calculating each rack
△DS(i)=Sc(i)-Sn(i)
Wherein, Sc (i) is the setting roll gap of preceding strip, and Sn (i) is the setting roll gap of rear strip；
The roll gap adjusted value of 6th step, each rack of setting
When forward and backward strip by thickness to it is thin, by it is soft to firmly and by width to it is narrow when, if the setting roll gap of the forward and backward strip of the i-th rack is inclined
Difference △ DS (i)<0 and | △ DS (i) |>| △ H (i) |, enable △ DS (i)=- | △ H (i) |/2, i.e. the roll gap adjusted value of the i-th rack
For-| △ H (i) |/2；
When forward and backward strip by it is thin to it is thick, by firmly to it is soft and by width to it is narrow when, if the setting roll gap deviation △ of forward and backward strip
DS (i) > 0 and △ DS (i) > △ H (i), enable △ DS (i)=△ H (i)/2, i.e. the roll gap adjusted value of the i-th rack is △ H (i)/2；
Wherein, △ H (i) is the deviation of the forward and backward strip exit thickness of the i-th rack；
7th step enables FGC control model, is adjusted according to the roll gap adjusted value of each rack to roll gap.
2. disconnected band is prevented when cold continuous rolling dynamic variable specification steel band according to claim 1 and loses the roll gap compensation method opened,
It is characterized by: the roll gap adjusted value of 2-5 rack is 0 in the 6th step, i.e., only adjust the gap values between rollers of the 1st rack.
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| CN111159649A (en) * | 2020-01-03 | 2020-05-15 | 北京科技大学 | Cold continuous rolling mill variable specification risk prediction method |
| CN112337982A (en) * | 2020-10-21 | 2021-02-09 | 河南中孚高精铝材有限公司 | Strip breakage protection control method of cold rolling mill |
| CN113042543A (en) * | 2021-03-05 | 2021-06-29 | 首钢京唐钢铁联合有限责任公司 | Rolling mill roll gap adjusting method and device and storage medium |
| CN114472541A (en) * | 2022-02-16 | 2022-05-13 | 南京钢铁股份有限公司 | Control method for thickness precision of steel plate |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112337982A (en) * | 2020-10-21 | 2021-02-09 | 河南中孚高精铝材有限公司 | Strip breakage protection control method of cold rolling mill |
| CN113042543A (en) * | 2021-03-05 | 2021-06-29 | 首钢京唐钢铁联合有限责任公司 | Rolling mill roll gap adjusting method and device and storage medium |
| CN113042543B (en) * | 2021-03-05 | 2022-12-13 | 首钢京唐钢铁联合有限责任公司 | Rolling mill roll gap adjusting method and device and storage medium |
| CN114472541A (en) * | 2022-02-16 | 2022-05-13 | 南京钢铁股份有限公司 | Control method for thickness precision of steel plate |
| CN114472541B (en) * | 2022-02-16 | 2024-01-09 | 南京钢铁股份有限公司 | Control method for thickness precision of steel plate |
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