CN109663817A - A kind of transversal thickness precision control method of Wide and Thick Slab flat roll mill - Google Patents
A kind of transversal thickness precision control method of Wide and Thick Slab flat roll mill Download PDFInfo
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- CN109663817A CN109663817A CN201811378730.XA CN201811378730A CN109663817A CN 109663817 A CN109663817 A CN 109663817A CN 201811378730 A CN201811378730 A CN 201811378730A CN 109663817 A CN109663817 A CN 109663817A
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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
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/02—Transverse dimensions
- B21B2261/04—Thickness, gauge
Abstract
The invention discloses a kind of transversal thickness precision control methods of Wide and Thick Slab flat roll mill, are particularly suitable for Wide and Thick Slab flat roll mill and produce 14~40mm thick steel plate.After to work roll changing, the rolling power limit of different-thickness specification steel plate most latter two passage, and when convexity is unsatisfactory for requiring, formulate suitable adjustable strategies, the convexity that Wide and Thick Slab flat roll mill institute rolled steel plate can effectively be controlled, greatly improves the cross caliper control precision of Wide and Thick Slab flat roll mill.
Description
Technical field
The present invention relates to technical field of steel rolling more particularly to a kind of transversal thickness precision controlling parties of Wide and Thick Slab flat roll mill
Method.
Background technique
In Wide and Thick Slab production, the same plate thickness difference of steel plate is extremely important, the longitudinal thickness difference master along steel plate length direction
If longitudinal roll gap fluctuates to realize when being rolled by reducing；Transverse thickness difference mainly pass through roll forming of the roll default one it is convex
It angle value and using roller or roller is used alone realizes.The size of transverse thickness difference not only influences the thickness and precision of steel plate, together
When also have significant impact to the straightness of steel plate.When more bigger than both sides thickness of steel plate interior thickness, i.e., positive convexity is larger
When, steel plate just will appear bilateral wave, and the bilateral wave of the positive bigger steel plate of convexity is bigger；When steel plate interior thickness is smaller than both sides thickness
It is more when, i.e., when negative convexity is larger, steel plate just will appear middle wave, and the negative big-and-middle wave of convexity is bigger.Bilateral wave or middle wave are smaller
When do not influence being normally carried out for mill milling, this defect can also be eliminated by subsequent thermal straightening machine or cold straightener；But
Be when bilateral wave or in the wave is high to a certain extent when, when mill milling, just will appear steel-fastening, and roll and milling train other equipment are damaged
It is bad, generate production accident.Even if there is not steel-fastening, these bilateral waves or in the steel plate that the wave is high also can not be by thermal straightening machine or cold
Straightener by its leveling, steel plate finally because straightness is exceeded sentence it is useless.
Milling train general work roller on now new is all the roller shape with control convexity, and usually also has roller.Make
Its transversal thickness precision for controlling steel plate is easier, and can preferably control the convexity of steel plate as needed.But now also
Old milling train on before many, the roll of these old milling trains is all plain-barreled roll, and does not have roller.These old milling trains are horizontal in control steel plate
Means are few when to thickness and precision, and shutting out the steel plate that comes, usually shape wave is serious, finally result in many steel plates sentence because straightness is exceeded it is useless.
The patent of publication number " 101850367 A of CN " is " a kind of to reduce maximum deviation amount as the Strip Shape Control side of target
Method " provides a kind of control strip length and width direction thickness and precision method, this method can be effectively controlled strip longitudinal direction and
Lateral thickness and precision.But this method has particular/special requirement to the roller shape of roll, while this method is suitable for the production of cold-strip steel.
Be not suitable for the wide and heavy plate mill Strip Shape Control of plain-barreled roll.
A kind of patent " thickness accuracy control method for medium-thickness plate " of publication number " 102294362 A of CN " provides a kind of edge
Steel plate length direction, width direction method for controlling thickness, preferable to the thickness control of steel plate, thickness and precision is higher.But the party
Method has particular/special requirement to support roller, the roller shape of working roll, and control system is also more complex, implement it is relatively difficult, cannot be flat
It is used on the wide and heavy plate mill of roller.
Patent " a kind of working roll and its roller of consideration to strip steel convexity and Edge Drop Control of publication number " 102744260 A of CN "
Shape design method " provides a kind of method that can preferably control strip profile.But this method is by the special of roll forming of the roll
It is required that realize, while being suitable for Continuous mill train, it is not applicable to the wide and heavy plate mill of plain-barreled roll.
Summary of the invention
In order to solve the above-mentioned technical problem, the object of the present invention is to provide the transversal thickness precision controls of Wide and Thick Slab flat roll mill
Method processed is particularly suitable for the production 10~40mm thick steel plate transversal thickness precision control of Wide and Thick Slab flat roll mill.
In order to solve the above technical problems, the present invention adopts the following technical scheme:
A kind of transversal thickness precision control method of Wide and Thick Slab flat roll mill, comprising:
S1, by the Crown control of steel plate between 0.02~0.08mm；
First block of 10~20mm thick steel plate is rolled after S2, replacement working roll, the roll-force of last two passage is controlled 18
Between~22MN, the roll-force of last two passage of latter block of steel plate is adjusted according to the practical convex value of previous block of steel plate, if
The convex value of previous block of steel plate is greater than 0.08mm, then the roll-force of last two passage of latter block of steel plate is reduced 2MN~6MN；If
The convex value of previous block of steel plate is greater than 0.02mm, then the roll-force of last two passage of latter block of steel plate is increased 2MN~6MN；It presses
The method adjustment, until plate crown control is until 0.02~0.08mm；
First piece of 20mm < thickness≤40mm steel plate is rolled after S3, replacement working roll, by the roll-force control of last two passage
System between 23~26MN, adjusted according to the practical convex value of previous block of steel plate by the roll-force of last two passage of latter block of steel plate
It is whole, if the convex value of previous block of steel plate is greater than 0.08mm, by the roll-force of last two passage of latter block of steel plate reduce 2MN~
6MN；If the convex value of previous block of steel plate is greater than 0.02mm, by the roll-force of last two passage of latter block of steel plate increase 2MN~
6MN；It according to said method adjusts, until plate crown control is until 0.02~0.08mm.
Further, change jobs rolling last two passage when rolling first block of 10~20mm thick steel plate after roller in S2
Power control processed is in 20MN.
Further, when rolling first piece of 20mm < thickness≤40mm steel plate after replacement working roll in S3, by last twice
Secondary roll-force is controlled in 24.5MN.
Further, it is applied to the production 10~40mm thick steel plate transversal thickness precision control of Wide and Thick Slab flat roll mill.
Wide and heavy plate mill on present Wide and Thick Slab is new, typically by the way that suitable roller shape is arranged and is controlled using roller
The convexity of steel plate, suitable roll forming of the roll, by plate shape software control system, can be easier to the convexity of control steel plate plus roller.
The transversal thickness precision of steel plate is higher.
And in the past on Wide and Thick Slab flat roll mill due to roller shape be it is flat, think effectively control steel plate convexity difficulty compare
Greatly, especially in the case where no roller.Flat roll mill only controls convexity by suitable passage sharing of load, if often
The roll-force of a time is all smaller, though controlling plate crown advantageous, it is more to roll steel plate road number, in this way first is that understand because
Drafts is small, and deformation is difficult to penetrate into steel plate center portion, leads to steel plate nonuniform organization, influences steel plate mechanical performance；Second is that because
Rolling pass number is more, and the rolling time of every block of steel is longer, and the production efficiency of milling train is low.If the roll-force of every a time compared with
Greatly, though the drafts of every a time is larger, the rolling pass number of every block of steel is few, and milling train production efficiency is higher, the convexity of steel plate
Greatly, shape wave is serious, and steel plate may finally be sentenced useless because straightness is exceeded.The present invention passes through to the last of one piece of steel plate rolling
The roll-force of two passages is limited, and control panel shape is carried out, reach not only can be effectively controlled plate crown but also can make milling train keep compared with
High production efficiency, while will not influence the mechanical performance of steel plate.
After applying the present invention, flat roll mill also can be effectively controlled plate crown, and the transversal thickness precision of steel plate greatly improves.
After applying the present invention, steel plate because convexity degree control it is unreasonable caused by straightness it is exceeded, the amount for being judged to useless has dropped 95% than in the past
More than.It ensure that the transversal thickness precision of steel plate is met the requirements.
Compared with prior art, advantageous effects of the invention:
1, the convexity that can be effectively controlled steel plate using the method for the present invention Wide and Thick Slab flat roll mill, guarantees the transverse gage of steel plate
Precision is met the requirements.
2, specific roll forming of the roll and special plate shape software control system are not needed using the method for the present invention, does not need volume
Outer investment, it is easy to accomplish in actual production.
3, this method is easy to operate, is easy to realize in production operation at the scene, convenient for the popularization and application of this method.
Specific embodiment
The invention will be further described with reference to embodiments.
Embodiment 1
First piece of finished product thickness of rolling is 10mm thick steel plate after replacing working roll, is by the roll-force control of last two passage
18MN.The convexity that first block of steel plate rolls is -0.03mm；Roll second piece of finished product thickness be 10mm steel plate when, last two passage
Roll-force increase 6MN on the basis of first piece, that is, roll the last two passages roll-force of steel plate of second piece of finished product thickness 10mm
For 24MN, the convexity that second block of steel plate rolls steel plate is 0.035mm, meets plate crown and wants between 0.02~0.08mm
It asks.The roll-force of last two passage is 24MN when second piece of later stack pile specification steel plate rolling, and the convexity for rolling steel plate can
It meets the requirements.
Embodiment 2
First piece of finished product thickness of rolling is 20mm thick steel plate after replacing working roll, is by the roll-force control of last two passage
22MN.The convexity that first block of steel plate rolls is -0.04mm；Roll second piece of finished product thickness be 20mm steel plate when, last two passage
Roll-force increase 6MN on the basis of first piece, that is, roll the last two passages roll-force of steel plate of second piece of finished product thickness 20mm
For 24MN, the convexity that second block of steel plate rolls steel plate is 0.018mm；When rolling third block finished product thickness is 20mm steel plate, finally
The roll-force of two passages increases 2MN on the basis of second piece, that is, rolls last two passage of steel plate of third block finished product thickness 20mm
Roll-force is 26MN, and the convexity that second block of steel plate rolls steel plate is 0.037mm, meets plate crown between 0.02~0.08mm
Requirement.The roll-force of last two passage is 26MN when the later stack pile specification steel plate rolling of third block, rolls the convex of steel plate
Degree can be met the requirements.
Embodiment 3
First piece of finished product thickness of rolling is 10mm thick steel plate after replacing working roll, is by the roll-force control of last two passage
22MN.The convexity that first block of steel plate rolls is 0.11mm；Roll second piece of finished product thickness be 20mm steel plate when, last two passage
Roll-force reduces 6MN on the basis of first piece, that is, the last two passages roll-force of steel plate for rolling second piece of finished product thickness 20mm is
18MN, the convexity that second block of steel plate rolls steel plate is 0.046mm, meets requirement of the plate crown between 0.02~0.08mm.
The roll-force of last two passage is 18MN when second piece of later stack pile specification steel plate rolling, and the convexity for rolling steel plate can meet
It is required that.
Embodiment 4
First piece of finished product thickness of rolling is 20mm thick steel plate after replacing working roll, is by the roll-force control of last two passage
22MN.The convexity that first block of steel plate rolls is 0.12mm；Roll second piece of finished product thickness be 20mm steel plate when, last two passage
Roll-force reduces 2MN on the basis of first piece, that is, the last two passages roll-force of steel plate for rolling second piece of finished product thickness 20mm is
20MN, the convexity that second block of steel plate rolls are 0.0105mm；When rolling third block finished product thickness is 20mm steel plate, last two passage
Roll-force reduce 4MN on the basis of second piece, that is, roll the last two passages roll-force of steel plate of third block finished product thickness 20mm
For 16MN, the convexity that third block steel plate rolls is that 0.06mm meets requirement of the plate crown between 0.02~0.08mm.Third
The roll-force of last two passage is 16MN when the later stack pile specification steel plate rolling of block, and the convexity for rolling steel plate, which can meet, to be wanted
It asks.
Embodiment 5
First piece of finished product thickness of rolling is 16mm thick steel plate after replacing working roll, is by the roll-force control of last two passage
21MN.The convexity that first block of steel plate rolls is 0.11mm；Roll second piece of finished product thickness be 20mm steel plate when, last two passage
Roll-force reduces 2.5MN on the basis of first piece, that is, rolls the last two passages roll-force of steel plate of second piece of finished product thickness 16mm
For 18.5MN, the convexity that second block of steel plate rolls is 0.086mm；When rolling third block finished product thickness is 16mm steel plate, last two
The roll-force of passage reduces 4.5MN on the basis of second piece, that is, rolls last two passage of steel plate of third block finished product thickness 16mm
Roll-force is 14MN, and the convexity that third block steel plate rolls meets plate crown for 0.052mm and wants between 0.02~0.08mm
It asks.The roll-force of last two passage is 14MN when the later stack pile specification steel plate rolling of third block, and the convexity for rolling steel plate can
It meets the requirements.
Embodiment 6
First piece of finished product thickness of rolling is 40mm thick steel plate after replacing working roll, is by the roll-force control of last two passage
23MN.The convexity that first block of steel plate rolls is -0.025mm；Roll second piece of finished product thickness be 40mm steel plate when, last two passage
Roll-force increase 6MN on the basis of first piece, that is, roll the last two passages roll-force of steel plate of second piece of finished product thickness 40mm
For 29MN, the convexity that second block of steel plate rolls steel plate is 0.042mm, meets plate crown and wants between 0.02~0.08mm
It asks.The roll-force of last two passage is 29MN when second piece of later stack pile specification steel plate rolling, and the convexity for rolling steel plate can
It meets the requirements.
Embodiment 7
First piece of finished product thickness of rolling is 35mm thick steel plate after replacing working roll, is by the roll-force control of last two passage
25MN.The convexity that first block of steel plate rolls is 0.016mm；Roll second piece of finished product thickness be 35mm steel plate when, last two passage
Roll-force increase 2MN on the basis of first piece, that is, roll the last two passages roll-force of steel plate of second piece of finished product thickness 35mm
For 27MN, the convexity that second block of steel plate rolls steel plate is 0.034mm, meets plate crown and wants between 0.02~0.08mm
It asks.The roll-force of last two passage is 27MN when second piece of later stack pile specification steel plate rolling, and the convexity for rolling steel plate can
It meets the requirements.
Embodiment 8
First piece of finished product thickness of rolling is 30mm thick steel plate after replacing working roll, is by the roll-force control of last two passage
26MN.The convexity that first block of steel plate rolls is 0.12mm；Roll second piece of finished product thickness be 30mm steel plate when, last two passage
Roll-force reduces 2MN on the basis of first piece, that is, the last two passages roll-force of steel plate for rolling second piece of finished product thickness 30mm is
24MN, the convexity that second block of steel plate rolls is 0.095mm, when rolling third block finished product thickness is 30mm steel plate, last two passage
Roll-force reduce 3.5MN on the basis of second piece, that is, roll last two passes of steel plate of third block finished product thickness 30mm
Power is 20.5MN, and the convexity that third block steel plate rolls is that 0.055mm meets requirement of the plate crown between 0.02~0.08mm.
The roll-force of last two passage is 20.5MN when the later stack pile specification steel plate rolling of third block, and the convexity for rolling steel plate can expire
Foot requires.
Embodiment described above is only that preferred embodiment of the invention is described, and is not carried out to the scope of the present invention
It limits, without departing from the spirit of the design of the present invention, those of ordinary skill in the art make technical solution of the present invention
Various changes and improvements, should all fall into claims of the present invention determine protection scope in.
Claims (4)
1. a kind of transversal thickness precision control method of Wide and Thick Slab flat roll mill characterized by comprising
S1, by the Crown control of steel plate between 0.02~0.08mm；
Roll first block of 10~20mm thick steel plate after S2, replacement working roll, by the control of the roll-force of last two passage 18~
Between 22MN, the roll-force of last two passage of latter block of steel plate is adjusted according to the practical convex value of previous block of steel plate, if preceding
The convex value of one block of steel plate is greater than 0.08mm, then the roll-force of last two passage of latter block of steel plate is reduced 2MN~6MN；If preceding
The convex value of one block of steel plate is greater than 0.02mm, then the roll-force of last two passage of latter block of steel plate is increased 2MN~6MN；By this
Method adjustment, until plate crown control is until 0.02~0.08mm；
First piece of 20mm < thickness≤40mm steel plate is rolled after S3, replacement working roll, the roll-force control of last two passage is existed
Between 23~26MN, the roll-force of last two passage of latter block of steel plate is adjusted according to the practical convex value of previous block of steel plate,
If the convex value of previous block of steel plate is greater than 0.08mm, the roll-force of last two passage of latter block of steel plate is reduced into 2MN~6MN；
If the convex value of previous block of steel plate is greater than 0.02mm, the roll-force of last two passage of latter block of steel plate is increased into 2MN~6MN；
It according to said method adjusts, until plate crown control is until 0.02~0.08mm.
2. the transversal thickness precision control method of Wide and Thick Slab flat roll mill according to claim 1, which is characterized in that in S2
It changes jobs and controls the roll-force of last two passage in 20MN when rolling first block of 10~20mm thick steel plate after roller.
3. the transversal thickness precision control method of Wide and Thick Slab flat roll mill according to claim 1, which is characterized in that in S3
When rolling first piece of 20mm < thickness≤40mm steel plate after replacement working roll, the roll-force control of last two passage is existed
24.5MN。
4. the transversal thickness precision control method of Wide and Thick Slab flat roll mill according to claim 1, which is characterized in that application
In the production 10~40mm thick steel plate transversal thickness precision control of Wide and Thick Slab flat roll mill.
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| CN201811378730.XA CN109663817B (en) | 2018-11-19 | 2018-11-19 | Transverse thickness precision control method of wide and thick plate flat roller mill |
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| CN201811378730.XA CN109663817B (en) | 2018-11-19 | 2018-11-19 | Transverse thickness precision control method of wide and thick plate flat roller mill |
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| CN109663817B CN109663817B (en) | 2020-02-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111451292A (en) * | 2020-03-31 | 2020-07-28 | 鞍钢股份有限公司 | Method for controlling transverse thickness precision of 1000 MPa-grade cold-rolled dual-phase steel |
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