CN110216152A - A kind of control method improving the strip wedge shape rolled there are two-phase section - Google Patents
A kind of control method improving the strip wedge shape rolled there are two-phase section Download PDFInfo
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- CN110216152A CN110216152A CN201910461620.8A CN201910461620A CN110216152A CN 110216152 A CN110216152 A CN 110216152A CN 201910461620 A CN201910461620 A CN 201910461620A CN 110216152 A CN110216152 A CN 110216152A
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- rack
- control
- strip
- reduction ratio
- guide plate
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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
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2263/00—Shape of product
- B21B2263/02—Profile, e.g. of plate, hot strip, sections
Abstract
The invention discloses a kind of control methods of strip wedge shape for improving and rolling there are two-phase section, it include: (1) sharing of load: the load distribution mode distributed using reduction ratio, in the case where meeting the good situation of strip crown, increase F1~F4 rack roll-force, reduce F5~F7 rack roll-force, rack roll-force is gradually decreased from rack F1 to F7；(2) guide plate and edger roll short stroke control；(3) convexity choosing value range: strip profile value is the difference of thickness average value at strip center thickness and edge 40mm, selects 27~32 μm of convexity range.The present invention solves wedge-shaped control technology problem of the CSP technique rolling in two-phase section rolling, realizes and greatly improves the gad shape precision, improves rear process quality precision.
Description
Technical field
The present invention relates to a kind of manufacturing methods of strip, and in particular to a kind of strip that raising is rolled there are two-phase section is wedge-shaped
Control method, belong to CSP hot rolling technology, hot rolled strip rolling strip manufacturing technology field.
Background technique
CSP hot-strip is one of the major product that Wuhan Iron and Steel Plant has the market advantage.In recent years, certainly with industrial user itself
Dynamicization is horizontal and power conservation requirement is continuously improved, and the steel plate shape required precision is increasingly harsh.It is competing in order to cope with the market being growing more intense
It strives, CSP can only constantly reduce cost under the high request for meeting template precision, so mentioning while increasing unit amount of rolling
High Strip Shape Control ability becomes the important development direction currently produced.
Due to the process characteristic of CSP continuous casting and rolling, reality can only be difficult using the production model with wide rolling, this mode of manufacture
Existing " online grinding roller ", strip are easy to form " box " abrasion in roll for a long time when roll same position rolls, and are unfavorable for wedge shape
Control, while also increase roll change frequency increase roller consumption.
Produce the variety steel thickness range: 2.3 to 2.8mm, main production: desulfurization → converter → Argon → LF →
Continuous casting → soaking pit → finish rolling → layer cooling → batches → lower process factory (other factories).
Strip wedge shape refers to thickness of two sides difference at steel edge portion 40mm, and it is laterally poor to react strip by thickness difference
Substantially situation, as shown in Fig. 1.Certainly different measurement points can also be chosen according to the difference of quality requirement, usually chooses wedge shape
Control range at (- 22um, 22um).
According to Analysis on Market Development, downstream client is higher and higher to product quality required precision, and wedge shape is to measure this kind
One of main index of steel, wedge-shaped superiority and inferiority directly affect final product quality, therefore, do not conform to mark in the wedge shape of hot-rolled process, only
Waste disposal can be pressed.The result shows that conventional wedge-shaped control means include operative skill, equipment precision etc..
China Patent Publication No. CN106607459A, the patent of invention of entitled hot-strip wedge shape control system and method
Application, discloses a kind of hot-strip wedge shape control system, is distributed using thermometer detection slab transverse temperature, to mill roll-gap
Pre-compensation is carried out, improves wedge rolling and final strip wedge shape, while improving hot rolling stability and belt steel product plate shape
Quality.
Summary of the invention
It is an object of the invention to overcome the shortcomings of the prior art, two-phase section under a kind of control CSP technique is provided and is rolled
The technical parameter that wedge shape controls when processed achievees the purpose that the qualified products for meeting lower process cold rolling user demand.
The present invention mainly designs in terms of sharing of load, guide plate and edger roll short stroke control, convexity choosing value range etc. three
Technological parameter, to achieve the purpose that improve wedge-shaped hit rate: the first, achieving the purpose that reduce roll wear from process aspect, protect
Demonstrate,prove steel edge portion profile；The second, it is calculated by two-phase section, chooses most suitable guide plate short stroke aperture, both reduced the production of dross
It is raw to guarantee centering of strip steel again.Edger roll is changed to pressure control by position control, guarantees slab centering rolling；Third, under satisfaction
Most suitable convexity choosing value section is chosen in the case where procedure calls, reduces the contradiction point of convexity and wedge shape control.
The specific technical solution of the present invention is as follows:
A kind of control method improving the strip wedge shape rolled there are two-phase section, comprising:
(1) sharing of load
The load distribution mode distributed using reduction ratio increases F1~F4 rack in the case where meeting the good situation of strip crown
Roll-force, reduces F5~F7 rack roll-force, and rack roll-force is gradually decreased from rack F1 to F7；
Wherein, when sharing of load, the reduction ratio range of rack is controlled are as follows: rack F1, reduction ratio range 48~52%, rack
F2, reduction ratio range 51~55%, rack F3, reduction ratio range 44~47%, rack F4, reduction ratio range 34~37%, machine
Frame F5, reduction ratio range 24~26%, rack F6, reduction ratio range 17~21%, rack F7, reduction ratio range 10~14%,
And the reduction ratio of rack F2 is more than or equal to the reduction ratio of rack F1.
(2) guide plate and edger roll short stroke control
2.1, guide plate short stroke control
Guide plate short stroke control is rack F2, controls 10~15mm of guide plate short stroke, rack F3, controls guide plate short stroke
15~20mm, rack F4 control 30~40mm of guide plate short stroke, rack F5, control 30~40mm of guide plate short stroke, rack F6,
35~45mm of guide plate short stroke, rack F7 are controlled, 40~50mm of guide plate short stroke is controlled；
2.2, edger roll control switchs to pressure control by position control
1~3 meter of slab head, 50~100KN of edger roll pressure is controlled, 27~39 meters of slab middle part controls edger roll pressure
200~300KN, 1~3 meter of slab tail portion control 200~300KN of edger roll pressure；
(3) convexity choosing value range
Strip profile value be strip center thickness and edge 40mm place thickness average value difference, selection convexity range 22~
32μm。
Further scheme is:
27~32 μm of convexity range of selection.
The present invention changes original laod sharing mode by control sharing of load, uses reduction ratio mode instead, reduces F5~F7
Rack roll-force reduces phase transformation and α-Fe deflection so as to increase γ deflection, reduces the abrasion of back segment breast roller, changes
The kind influence of strip running deviation and roll wear for steel edge portion profile.
Why the present invention controls guide plate and edger roll short stroke control, is since guide plate short stroke aperture has band for strip
Steel effect not only contributes to the centering of logical plate, is also beneficial to throw the stability of steel, so having centainly to band steel toe, tail wedge shape
It influencing, but turns down be easy that friction welding (FW) benefit occurs and guide plate dross occurs with silicon steel simply, aperture amplification is unfavorable for centering of strip steel,
So short stroke technique is formulated in present invention combination phase transformation.Control edger roll lateral pressure is because using slab when position control when designing
There is a situation where into milling train not entirely on the center, is unfavorable for strip wedge shape control (especially end to end wedge-shaped).
Why the present invention controls convexity choosing value range.Convexity is equally affected to rear process lateral thickness difference with wedge shape,
Convexity is smaller to be more unfavorable for wedge-shaped control, but convexity is big rear process is rolled again again after lateral thickness difference impact, so this
Invention requires convexity to improve using suitable control interval cooperation wedge shape.
Compared with prior art, it is difficult to solve wedge-shaped control technology of the CSP technique rolling in two-phase section rolling by the present invention
Topic, realizes and greatly improves the gad shape precision, improve rear process quality precision, have the effect that
1. this method does not need reforming equipment in implementation process, existing equipment and control can be used；
2. this method is suitable for the promotion of the low aluminothermy rolled steel coils hot rolling wedge shape precision of high silicon；
3. this method is simple and easy to do, easily operated, practical.
4. wedge-shaped precision is increased to 97.1% from 95.8%, product quality is improved, the occurrence quantity of waster is reduced.
Detailed description of the invention
Fig. 1 strip wedge shape schematic diagram；
Fig. 2 roll-force distribution schematic diagram；
Fig. 3 phase transformation schematic diagram；
Fig. 4 Wuhan Iron and Steel Plant CSP producing line equipment arrangement schematic diagram；
Fig. 5 wedge shape does not conform to schematic diagram.
Specific embodiment
Attached drawing 1 is strip wedge shape schematic diagram of the present invention, in which:
X: strip is away from edge position, the mm comprising 25,40,50,75,100 ... ...
Y: strip includes 5,10,15 ..mm away from edge position
OS: strip fore side；
DS: strip transmission side；
H: steel strip thickness；
Hx1: the steel strip thickness at x1；
Wedge shape (- 22um, 22um): W40=hx40 (OS)-hx40 (DS) satisfaction -22um≤W40≤22um.
It as shown in Fig. 4, is Wuhan Iron and Steel Plant CSP production line schematic diagram, according to the hot-strip that the production line produces, thickness model
It encloses: 2.3 to 2.8mm, main production: desulfurization → converter → Argon → LF → continuous casting → soaking pit → finish rolling → layer is cold
But → batch → lower process factory.Wuhan Iron and Steel Plant CSP production line schematic diagram, including 1. rotate dephosphorizing machine, 2. pendulum cut, 3. soaking pit, 4. thing
Therefore cut, 5. dephosphorizing machine, 6. edger roll, 7. mm finishing mill unit, 8. section cooling, 9. batch.For the worked of specific CSP production line
Journey could be aware that details are not described herein again to those skilled in the art.
In Fig. 5, left figure shows that the larger i.e. wedge shape of thickness of two sides difference is larger, this figure is instantaneous cross-section diagram；Right figure is multiple winks
When figure be depicted as curve, this figure show entire volume gad shape fluctuation it is larger.These are all the underproof situations of wedge shape.It should avoid
The control method provided in this embodiment for improving the strip wedge shape rolled there are two-phase section, comprising:
(1) sharing of load:
In the steel mill process, whole roll-force is little, and former load distribution mode is mainly approximate with energy consumption method, produces at present
The load distribution mode for using reduction ratio distribution instead increases F1~F4 rack roll-force, subtracts in the case where meeting the good situation of strip crown
Small F5~F7 rack roll-force, specific as follows: F1 roll-force 25000-30000KN, F2 roll-force 25000-30000KN, F3 roll
Power 22000-27000KN processed, F4 roll-force 22000-27000KN, F5 roll-force 80000-13000KN, F6 roll-force 70000-
12000KN, F7 roll-force 50000-10000KN, according to iron silicon phasor and resistance of deformation figure, silicon steel starts phase transformation in F3 rack,
Terminate phase transformation in F5 rack, then increase austenite deformation amount increasing pressure before phase change, the austenite after refinement reduce phase transformation and
α-Fe deflection, and roll wear can also be reduced after the reduction of rear frame roll-force, and such roll shape keeps more longlasting and is conducive to break
Face guarantees that design parameter see the table below 1 and attached drawing 2.
1 reduction ratio sharing of load of table
(2) guide plate and edger roll short stroke control
2.1, guide plate short stroke control parameter is flipper guide aperture setting: SGt=B (1+a)+Bi；
SGt-guide plate aperture [mm]；B-finished width [mm]；A-thermal expansion coefficient (about 0.01)；Bi-operation tune
Section amount [mm].The adjustable nose of operator, in, tail portion short stroke, guarantee rolling stablize.
Such as Fig. 3 it can be observed that starting transformation temperature is 960~970 DEG C, start transformation temperature strip in conjunction with practical production experience
With reciprocal fluctuation in deformation process, so being needed when strip back and forth fluctuates inviolent through guide plate short stroke aperture
Increase to strip to neutrality.
2 guide plate short stroke setting requirements of table
2.2, edger roll control switchs to pressure control by position control
The program guarantees the lateral pressure of edger roll, and milling train is sent into slab centering, is controlled when due to design using position, practical
Position there are being difficult to ensure when deviation, use instead this scheme can guarantee as far as possible slab to neutrality roll.
3 edger roll control program of table
(3) convexity choosing value range
Strip profile value and shim values, which exist, calculates difference are as follows: the difference of center thickness and thickness average value at edge 40mm
Value.It reacts strip and arranges profile, and strip profile is smaller, and strip wedge shape precision is more difficult to control；But convexity is bigger, same plate after cold rolling
Thick difference precision is difficult to ensure.
4 convexity choosing value range of table
| Convexity range | Wedge-shaped precision | Process is evaluated afterwards | This programme control interval |
| 32~37um | 97.5% | It is poor | |
| 27~32um | 97.1% | It is good | √ |
| 22~27um | 96.5% | It is good | |
| 17-22um | 94.5% | It is poor | |
| 12~17um | 92.4% | It is poor |
Effect: there are two-phase section rolling steel grade wedge-shaped control range ± 22um within stable accuracy >=97.1% with
On reach best level of the same trade
The present invention is described in detail below:
The test steel grade predominant quantity degree of following embodiments are as follows: C:0.0 2~0.005%, Si
>=1.56%, Mn:0.75~0.82%, P≤0.004%, S≤0.005%, Als:0.02~0.03%.
Embodiment 1
The wedge-shaped mean value of the present embodiment is 3mm, overall length hit rate 98.01%, scope of statistics ± 22um, thickness 2.55mm.
A method of it is improved with CSP process with a thickness of 2.55mm strip, step:
1) reduction ratio sharing of load scheme is as follows；
2) guide plate short stroke and edger roll control parameter；
2 guide plate short stroke setting requirements of table
3) convexity target 28um, practical 29um；
Process feedback lateral thickness difference is preferable after, and 7um precision 99.56%, 5um precision 91.15%, hot-rolled process wedge shape is
Value is 3mm, and overall length hit rate 97.98%, situation is preferable.
Embodiment 2
The wedge-shaped mean value of the present embodiment is 2mm, overall length hit rate 98.11%, scope of statistics ± 22um, thickness 2.55mm.
A method of it is improved with CSP process with a thickness of 2.55mm strip, step:
1) reduction ratio sharing of load scheme is as follows；
2) guide plate short stroke control parameter；
2 guide plate short stroke setting requirements of table
3) convexity target 29um, practical 29um；
Process feedback lateral thickness difference is preferable after, and 7um precision 99.44%, 5um precision 90.05%, hot-rolled process wedge shape is
Value is 2mm, and overall length hit rate 97.98%, situation is preferable.
Embodiment 3
The wedge-shaped mean value of the present embodiment is 0mm, overall length hit rate 99.31%, scope of statistics ± 22um, thickness 2.55mm.
A method of it is improved with CSP process with a thickness of 2.55mm strip, step:
1) reduction ratio sharing of load scheme is as follows；
2) guide plate short stroke control parameter；
2 guide plate short stroke setting requirements of table
3) convexity target 27um, practical 27um；
Process feedback lateral thickness difference is preferable after, and 7um precision 99.47%, 5um precision 91.15%, hot-rolled process wedge shape is
Value is 0mm, and overall length hit rate 99.31%, situation is preferable.
Embodiment 4
The wedge-shaped mean value of the present embodiment is -4mm, overall length hit rate 97.68%, scope of statistics ± 22um, thickness 2.55mm.
A method of it is improved with CSP process with a thickness of 2.55mm strip, step:
1) reduction ratio sharing of load scheme is as follows；
2) guide plate short stroke control parameter；
2 guide plate short stroke setting requirements of table
3) convexity target 30um, practical 31um；
Process feedback lateral thickness difference is preferable after, and 7um precision 98.47%, 5um precision 89.20%, hot-rolled process wedge shape is
Value is -4mm, and overall length hit rate 97.68%, situation is preferable.
Embodiment 5
The wedge-shaped mean value of the present embodiment is -2mm, overall length hit rate 97.81%, scope of statistics ± 22um, thickness 2.55mm.
A method of it is improved with CSP process with a thickness of 2.55mm strip, step:
1) reduction ratio sharing of load scheme is as follows:
1) guide plate short stroke control parameter；
2 guide plate short stroke setting requirements of table
2) convexity target 29um, practical 29um；
Process feedback lateral thickness difference is preferable after, and 7um precision 98.21%, 5um precision 89.33%, hot-rolled process wedge shape is
Value is -2mm, and overall length hit rate 97.81%, situation is preferable.
Although reference be made herein to invention has been described for explanatory embodiment of the invention, and above-described embodiment is only this hair
Bright preferable embodiment, embodiment of the present invention are not limited by the above embodiments, it should be appreciated that those skilled in the art
Member can be designed that a lot of other modification and implementations, these modifications and implementations will fall in principle disclosed in the present application
Within scope and spirit.
Claims (2)
1. a kind of control method for improving the strip wedge shape rolled there are two-phase section, characterized by comprising:
(1) sharing of load
The load distribution mode distributed using reduction ratio increases the rolling of F1~F4 rack in the case where meeting the good situation of strip crown
Power, reduces F5~F7 rack roll-force, and rack roll-force is gradually decreased from rack F1 to F7；
When sharing of load, the reduction ratio range of rack is controlled are as follows: rack F1, reduction ratio range 48~52%, rack F2, reduction ratio
Range 51~55%, rack F3, reduction ratio range 44~47%, rack F4, reduction ratio range 34~37%, rack F5, reduction ratio model
Enclose 24~26%, rack F6, reduction ratio range 17~21%, rack F7, reduction ratio range 10~14%, and the reduction ratio of rack F2
More than or equal to the reduction ratio of rack F1；
(2) guide plate and edger roll short stroke control
2.1, guide plate short stroke control
Guide plate short stroke control is rack F2, control 10~15mm of guide plate short stroke, rack F3, control guide plate short stroke 15~
20mm, rack F4 control 30~40mm of guide plate short stroke, rack F5, control 30~40mm of guide plate short stroke, rack F6, control
Guide plate 35~45mm of short stroke, rack F7 control 40~50mm of guide plate short stroke；
2.2, edger roll control switchs to pressure control by position control
1~3 meter of slab head, control 50~100KN of edger roll pressure, 27~39 meters of slab middle part, control edger roll pressure 200~
300KN, 1~3 meter of slab tail portion control 200~300KN of edger roll pressure；
(3) convexity choosing value range
Strip profile value is the difference of thickness average value at strip center thickness and edge 40mm, selects 22~32 μ of convexity range
m。
2. improving the control method of the strip wedge shape rolled there are two-phase section according to claim 1, it is characterised in that:
Convexity range is 27~32 μm.
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Cited By (2)
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| CN113522967A (en) * | 2021-06-25 | 2021-10-22 | 武汉钢铁有限公司 | Control method for rolling 550 MPa-level wide-width thin-specification high-strength steel plate in short process |
| CN113680818A (en) * | 2021-06-22 | 2021-11-23 | 武汉钢铁有限公司 | CSP flow-based SAE1006 thin material manufacturing method |
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