CN107537864A - To the control method of steel plate ultra-wide end to end in rough rolling process - Google Patents
To the control method of steel plate ultra-wide end to end in rough rolling process Download PDFInfo
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Abstract
The invention provides it is a kind of in rough rolling process to the control method of steel plate ultra-wide end to end, the one final passage of last increase of this method in rough rolling process, the drafts that plain-barreled roll is set in the final passage is 0, and edger roll is set in two sides of steel plate in the final passage, the part for the ultra-wide end to end to steel plate extrudes.By being suitably designed the gap values between rollers of edger roll and the drafts of plain-barreled roll, the phenomenon of ultra-wide end to end of steel plate can be controlled well.To the control method of steel plate ultra-wide end to end in the rough rolling process of the present invention, according to the parameter such as slab and target plate size, optimize rolling pass plan, formulate the gap preset strategy of edger roll passage, efficiently control steel plate width accuracy end to end, lift steel plain shape.
Description
Technical field
The present invention relates to it is a kind of in rough rolling process to the control method of steel plate ultra-wide end to end.
Background technology
During current Heavy plate production, slab needs to carry out plan view control in shaping or/and broadening stage, causes
The thickness of steel plate is in the trend of edge thickness intermediate thin in the direction of the width after the broadening stage, and centre is more exacerbated after using edger roll
The thick situation of base edge.
In the follow-up finish rolling stage, because middle base is only extruded by thickness direction, material constantly make backward by flowing
Into finally deploying end to end in steel plate, so as to produce head and tail width ultra-wide phenomenon.
In heavy plate rolling production technology, vertical miller is the visual plant for controlling finished steel plate flat shape and size,
The especially combined use of vertical miller and roughing mill, the width of steel plate after the broadening stage can be effectively controlled, so as to reach essence
The really purpose of control finished width.
The content of the invention
It is an object of the present invention to provide a kind of control method of steel plate ultra-wide end to end, to better control over the plate of steel plate
Shape.
To the control method of steel plate ultra-wide end to end in the rough rolling process of the present invention, the rough rolling process last increase most
Whole passage, the drafts that plain-barreled roll is set in the final passage is 0, and the two of the steel plate in the final passage
Individual side sets edger roll, and the part for the ultra-wide end to end to the steel plate extrudes.
Alternatively, gap values between rollers L0, the basic gap values between rollers L0 based on the gap values between rollers between the edger roll on both sides are set
Calculate as follows：Step 1：The initial value for setting minimum drafts Tmin and maximum reduction Tmax is respectively 0 and institute
State the Breadth Maximum W of steel plate；Step 2：Judging the difference that the maximum reduction Tmax subtracts the minimum drafts Tmin is
It is no to be less than predetermined value, if then performing step 8, if otherwise performing step 3；Step 3：Calculate iteration drafts T=(Tmin+
Tmax)/2；Step 4：Contact arc length and flow stress are calculated, and is rolled by the contact arc length and flow stress unit of account
Power processed；Step 5：Judge whether the unit roll-force exceedes the limiting value of the edger roll equipment, if then performing step 6,
If otherwise perform step 7；Step 6：Update the maximum reduction Tmax so that Tmax=T, and return to step two；Step
Seven：Update the minimum drafts Tmin so that Tmin=T, and return to step two；Step 8：The basic gap values between rollers L0=
T。
Preferably, gap values between rollers L0 subtracts correction amount L based on gap values between rollers between the edger roll on both sides are set, described
Basic gap values between rollers L0 is calculated as follows：Step 1：Set that minimum drafts Tmin's and maximum reduction Tmax is initial
Value is respectively the Breadth Maximum W of 0 and the steel plate；Step 2：Judge that the maximum reduction Tmax subtracts the minimum pressure
Whether amount Tmin difference is less than predetermined value, if then performing step 8, if otherwise performing step 3；Step 3：Calculate iteration
Drafts T=(Tmin+Tmax)/2；Step 4：Contact arc length and flow stress are calculated, and passes through the contact arc length and rheology
Stress calculation unit roll-force；Step 5：Judge whether the unit roll-force exceedes the limiting value of the edger roll equipment, if
Step 6 is then performed, if otherwise performing step 7；Step 6：Update the maximum reduction Tmax so that Tmax=T, and return
Return step 2；Step 7：Update the minimum drafts Tmin so that Tmin=T, and return to step two；Step 8：The base
Plinth gap values between rollers L0=T.
Alternatively, the correction amount L is roll gap correction amount L1, and its span is 40mm~80mm.
Preferably, the correction amount L is roll gap correction amount L1, and the roll gap correction amount L1 is according to equation below meter
Calculate：Δ L1=foundation corrections amount × ratio of elongation correction factor × broadening ratio correction factor, wherein, the value of the foundation correction amount
Scope is 40mm~80mm, and the span of the ratio of elongation correction factor is 1.0~1.5, the broadening ratio correction factor
Span is 1.0~1.5.
Alternatively, the correction amount L is roll gap correction amount L1 and MAS correction amount L2 sums, the MAS corrections
Δ L2 span is 20mm~40mm.
Preferably, the correction amount L is roll gap correction amount L1 and MAS correction amount L2 sums, the MAS corrections
Δ L2 calculates according to equation below：Δ L2=basis MAS corrections × shaping MAS correction factors × broadening MAS correction factors, its
In, the span of the basic MAS corrections is 20mm~40mm, and the span of the shaping MAS correction factors is 1.0
~1.5, the span of the broadening MAS correction factors is 1.0~1.5.
Further, start to increase initial passage in the broadening stage of the rough rolling process, the pressure of the initial passage
Lower amount Δ s0Calculated according to equation below：Original n passage in the broadening stage
Drafts Δ s1~Δ snCalculated according to equation below：Wherein, Δ
H be the broadening stage overall reduction, Δ hiFor the drafts of original i-th passage in the broadening stage.
Alternatively, start to increase initial passage in the broadening stage of the rough rolling process, the pressure of the initial passage
Measure Δ s0Span be 0.5mm~5mm, the drafts Δ s of original n passage in the broadening stage1~Δ snAccording to
Equation below calculates：Wherein, Δ H is the overall reduction in the broadening stage,
ΔhiFor the drafts of original i-th passage in the broadening stage.
Preferably, the Breadth Maximum W of the steel plate is measured with the following method：Before the final passage is carried out, in institute
State steel plate both sides and flipper guide is set respectively, the flipper guide is pressed against the side of the steel plate of place side, measures two institutes respectively
State the distance between flipper guide, the Breadth Maximum W of as described steel plate.
To the control method of steel plate ultra-wide end to end in the rough rolling process of the present invention, joined according to slab and target plate size etc.
Number, optimize rolling pass plan, formulate the gap preset strategy of edger roll passage, efficiently control steel plate width accuracy end to end, carry
Rise steel plain shape.
Brief description of the drawings
Fig. 1 is the schematic diagram of the Breadth Maximum of measurement steel plate.
Embodiment
With reference to the accompanying drawings and detailed description in the rough rolling process of the present invention to the controlling party of steel plate ultra-wide end to end
Method is described in further detail, but not as a limitation of the invention.
The invention provides it is a kind of in rough rolling process to the control method of steel plate ultra-wide end to end, this method is in rough rolling process
One final passage of last increase, in the final passage set plain-barreled roll drafts be 0, and in the final passage
Two sides of steel plate set edger roll, and the part for the ultra-wide end to end to steel plate extrudes.By being suitably designed edger roll
Gap values between rollers and plain-barreled roll drafts, the phenomenon of ultra-wide end to end of steel plate can be controlled well.
As an alternative embodiment, roll gap based on can the gap values between rollers between the edger roll on steel plate both sides be set
Value L0.Basic gap values between rollers L0 is calculated as follows：
Step 1：The initial value for setting minimum drafts Tmin and maximum reduction Tmax is respectively the maximum of 0 and steel plate
Width W；Step 2：Judge that maximum reduction Tmax subtracts minimum drafts Tmin difference and whether is less than predetermined value, if then
Step 8 is performed, if otherwise performing step 3；Step 3：Calculate iteration drafts T=(Tmin+Tmax)/2；Step 4：Calculate
Contact arc length and flow stress, and pass through contact arc length and flow stress unit of account roll-force；Step 5：Judge that unit rolls
Whether power exceedes the limiting value of edger roll equipment, if then performing step 6, if otherwise performing step 7；Step 6：Renewal is maximum
Drafts Tmax so that Tmax=T, and return to step two；Step 7：Update minimum drafts Tmin so that Tmin=T, and
Return to step two；Step 8：Basic gap values between rollers L0=T.
Wherein, the Breadth Maximum W of steel plate measuring method is：Before the progress of final passage, reference picture 1, in steel plate both sides
Flipper guide is set respectively so that two flipper guides are respectively between the side of the steel plate of place side, two flipper guides of measurement
Distance, as steel plate Breadth Maximum W.
Wherein contact arc length lcCalculated according to equation below：
Wherein R is the roll neck of edger roll, and B is the steel plate width of entrance, and b is the steel of outlet
Plate width, h are hitchcock coefficients.
Flow stress fs computational methods are：
Fs=kf × ecorr
Corr=tc×T+sc1×log(strain)+sc2Roll-force on the basis of/strain, wherein kf, corr should for rheology
Force coefficient, tcFor temperature correction coefficient, span is that -0.003~-0.002, T is steel billet temperature, sc1For Stress Correction Coefficient
1, span is -0.3~-0.1, sc2For Stress Correction Coefficient 2, span is that -0.06~-0.05, strain is stress.
According to contact arc length and flow stress unit of account rolling force FspecMethod be：Fspec=fs × lc。
As a preferred embodiment, gap values between rollers L0 subtracts correction amount L based on the gap values between rollers of edger roll are set.Base
Plinth gap values between rollers L0 calculates still according to manner described above.Wherein, if steel plate is without MAS passages, correction amount L=rollers
Stitch correction amount L1；If steel plate have passed through MAS passages, correction amount L=roll gap correction amount L1+MAS correction amounts L2.
Wherein, roll gap correction amount L1 can have two kinds of determination modes.First way, can be directly according to span
To determine, roll gap correction amount L1 span is 40mm~80mm.Second of determination mode, roll gap correction amount L1=bases
Plinth correction × ratio of elongation correction factor × broadening ratio correction factor.Wherein, the span of foundation correction amount be 40mm~
80mm, the span of ratio of elongation correction factor is 1.0~1.5, and the span of broadening ratio correction factor is 1.0~1.5.
MAS correction amounts L2 can also have two kinds of determination modes.First way, directly it can come according to span true
Fixed, MAS correction amounts L2 span is 20mm~40mm.Second of determination mode, MAS correction amount L2=basis MAS
Correction × shaping MAS correction factors × broadening MAS correction factors.Wherein, the span of basic MAS corrections be 20mm~
40mm, the span of shaping MAS correction factors is 1.0~1.5, and the span of broadening MAS correction factors is 1.0~1.5.
In the broadening stage of rough rolling process, increasing an initial passage, the drafts Δ s of the initial passage at the beginning0
It can be calculated according to equation below：
Wherein, Δ H be the broadening stage overall reduction, Δ hiFor the exhibition
The drafts of original i-th passage in wide stage.
Correspondingly, the drafts Δ s of original n passage in broadening stage1~Δ snCalculated according to equation below：
Wherein, Δ H is under the stagnation pressure in the broadening stage
Amount, Δ hiFor the drafts of original i-th passage in the broadening stage.
It is bad in view of the plate shape of first passage in broadening stage, light reduction can be carried out to increased initial passage
Strategy.I.e., in another embodiment, the drafts Δ s of broadening stage increased initial passage0Span be
0.5mm~5mm, correspondingly, the drafts Δ s of original n passage of ensuing several passages, i.e. broadening stage1~Δ sn
Calculated according to equation below：Wherein, Δ H is under the stagnation pressure in the broadening stage
Amount, Δ hiFor the drafts of original i-th passage in the broadening stage.
Illustrate below by way of specifically embodiment in the rough rolling process of the present invention to the control method of steel plate ultra-wide end to end.
Certain slab thickness 250mm, width 1900mm, length 3800mm, finished steel plate thickness 18mm, width 2500mm are long
Degree 38000mm, broadening ratio 1.3, ratio of elongation 10, rough rolling process include 7 passages, the wherein passage of formative stage 1, broadening stage 3 altogether
Passage, the passage of finish rolling stage 3, as shown in table 1.
The former roughing passage setting table of table 1
| Stage | Road number | Drafts (mm) |
| Shaping | 1 | 25 |
| Broadening | 2 | 20 |
| Broadening | 3 | 20 |
| Broadening | 4 | 20 |
| Finish rolling | 5 | 35 |
| Finish rolling | 6 | 30 |
| Finish rolling | 7 | 25 |
After in the rough rolling process of the present invention to the steel plate end to end control method of ultra-wide, the broadening stage increases initial road
Secondary, its drafts is 0.8mm, the last and final passage of increase (being set as airway time) of rough rolling process, therefore the application present invention
Rough rolling process in it is as shown in table 2 to the rough rolling process after the steel plate end to end control method of ultra-wide, wherein passage 2 and 9 is newly-increased
Passage.
The basic gap values between rollers L0 of edger roll is 2560mm, and roll gap correction amount L1 foundation correction amount is 40mm, and ratio of elongation is repaiied
Positive coefficient is 1.1, and broadening ratio correction factor is 1.02.Then：
Roll gap correction amount L1=foundation corrections amount × ratio of elongation correction factor × broadening ratio correction factor=40 × 1.1 ×
1.02=44.88mm.
This steel plate has used MAS passages, and basic MAS corrections are 25mm, and shaping MAS correction factors are 1.0, broadening MAS
Correction factor is 1.05.Then：
MAS correction amount L2=basis MAS corrections × shaping MAS correction factors × broadening MAS correction factor=25 ×
1.0 × 1.05=26.25mm.
Therefore, gap values between rollers L0- correction amount L=bases gap values between rollers L0- roll gap based on the gap values between rollers of final edger roll are set
Correction amount L1-MAS correction amount L2=2560-44.88-26.25=2488.88mm.
After in the rough rolling process of the present invention to the steel plate end to end control method of ultra-wide, the final width accuracy of steel plate
12mm is promoted to by 16mm.
Roughing passage setting table after the application present invention of table 2
| Stage | Road number | Drafts (mm) | Edger roll roll gap (mm) |
| Shaping | 1 | 25 | - |
| Broadening | 2 | 0.8 | - |
| Broadening | 3 | 19.7 | - |
| Broadening | 4 | 19.7 | - |
| Broadening | 5 | 19.7 | - |
| Finish rolling | 6 | 35 | - |
| Finish rolling | 7 | 30 | - |
| Finish rolling | 8 | 25 | - |
| Finish rolling | 9 | 0 | 2488.88 |
The art of this patent is mainly solved in the operation of rolling, and because middle base is only extruded by thickness direction, material is not
Disconnected flowing backward causes finally in steel plate end to end to deploy, the problem of so as to produce head and tail width ultra-wide.The rough rolling process of the present invention
In to the control method of steel plate ultra-wide end to end, according to the parameter such as slab and target plate size, optimize rolling pass plan, formulate
The gap preset strategy of edger roll passage, steel plate width accuracy end to end is efficiently controlled, lift steel plain shape.
Above embodiment is only the illustrative embodiments of the present invention, it is impossible to be used in limits the present invention, the present invention
Protection domain be defined by the claims.Those skilled in the art can be in the essence and protection domain of the present invention, to this
Various modifications or equivalent substitution are made in invention, and these modifications or equivalent substitution also should be regarded as being within the scope of the present invention.
Claims (10)
1. to the control method of steel plate ultra-wide end to end in a kind of rough rolling process, it is characterised in that in the last of the rough rolling process
Increasing final passage, the drafts that plain-barreled roll is set in the final passage is 0, and in the steel in the final passage
Two sides of plate set edger roll, and the part for the ultra-wide end to end to the steel plate extrudes.
2. the control method of steel plate according to claim 1 ultra-wide end to end, it is characterised in that between the edger roll on both sides
Gap values between rollers set based on gap values between rollers L0, the basic gap values between rollers L0 calculates as follows：
Step 1：The initial value for setting minimum drafts Tmin and maximum reduction Tmax is respectively the maximum of 0 and the steel plate
Width W；
Step 2：Judge that the maximum reduction Tmax subtracts the difference of the minimum drafts Tmin and whether is less than predetermined value,
If then performing step 8, if otherwise performing step 3；
Step 3：Calculate iteration drafts T=(Tmin+Tmax)/2；
Step 4：Contact arc length and flow stress are calculated, and passes through the contact arc length and flow stress unit of account roll-force；
Step 5：Judge whether the unit roll-force exceedes the limiting value of the edger roll equipment, if then performing step 6, if
Otherwise step 7 is performed；
Step 6：Update the maximum reduction Tmax so that Tmax=T, and return to step two；
Step 7：Update the minimum drafts Tmin so that Tmin=T, and return to step two；
Step 8：The basic gap values between rollers L0=T.
3. the control method of steel plate according to claim 1 ultra-wide end to end, it is characterised in that between the edger roll on both sides
Gap values between rollers set based on gap values between rollers L0 subtract correction amount L, the basic gap values between rollers L0 is calculated as follows：
Step 1：The initial value for setting minimum drafts Tmin and maximum reduction Tmax is respectively the maximum of 0 and the steel plate
Width W；
Step 2：Judge that the maximum reduction Tmax subtracts the difference of the minimum drafts Tmin and whether is less than predetermined value,
If then performing step 8, if otherwise performing step 3；
Step 3：Calculate iteration drafts T=(Tmin+Tmax)/2；
Step 4：Contact arc length and flow stress are calculated, and passes through the contact arc length and flow stress unit of account roll-force；
Step 5：Judge whether the unit roll-force exceedes the limiting value of the edger roll equipment, if then performing step 6, if
Otherwise step 7 is performed；
Step 6：Update the maximum reduction Tmax so that Tmax=T, and return to step two；
Step 7：Update the minimum drafts Tmin so that Tmin=T, and return to step two；
Step 8：The basic gap values between rollers L0=T.
4. the control method of steel plate according to claim 3 ultra-wide end to end, it is characterised in that the correction amount L is roller
Correction amount L1 is stitched, its span is 40mm~80mm.
5. the control method of steel plate according to claim 3 ultra-wide end to end, it is characterised in that the correction amount L is roller
Correction amount L1 is stitched, the roll gap correction amount L1 calculates according to equation below：
Δ L1=foundation corrections amount × ratio of elongation correction factor × broadening ratio correction factor,
Wherein, the span of the foundation correction amount is 40mm~80mm, and the span of the ratio of elongation correction factor is
1.0~1.5, the span of the broadening ratio correction factor is 1.0~1.5.
6. the control method of steel plate according to claim 3 ultra-wide end to end, it is characterised in that the correction amount L is roller
Correction amount L1 and MAS correction amount L2 sums are stitched, the span of the MAS correction amounts L2 is 20mm~40mm.
7. the control method of steel plate according to claim 3 ultra-wide end to end, it is characterised in that the correction amount L is roller
Correction amount L1 and MAS correction amount L2 sums are stitched, the MAS correction amounts L2 calculates according to equation below：
Δ L2=basis MAS corrections × shaping MAS correction factors × broadening MAS correction factors,
Wherein, the span of the basic MAS corrections is 20mm~40mm, the value model of the shaping MAS correction factors
Enclose for 1.0~1.5, the span of the broadening MAS correction factors is 1.0~1.5.
8. the control method of steel plate according to claim 1 ultra-wide end to end, it is characterised in that in the exhibition of the rough rolling process
The wide stage starts to increase initial passage,
The drafts Δ s of the initial passage0Calculated according to equation below：
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The drafts Δ s of original n passage in the broadening stage1~Δ snCalculated according to equation below：
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Wherein, Δ H be the broadening stage overall reduction, Δ hiFor the pressure of original i-th passage in the broadening stage
Amount.
9. the control method of steel plate according to claim 1 ultra-wide end to end, it is characterised in that in the rough rolling process
The broadening stage starts to increase initial passage, the drafts Δ s of the initial passage0Span for 0.5mm~
5mm, the drafts Δ s of original n passage in the broadening stage1~Δ snCalculated according to equation below：Wherein, Δ H be the broadening stage overall reduction, Δ hiFor the broadening
The drafts of original i-th passage in stage.
10. the control method of steel plate according to Claims 2 or 3 ultra-wide end to end, it is characterised in that the maximum of the steel plate
Width W is measured with the following method：Before the final passage is carried out, flipper guide is set respectively in the steel plate both sides, it is described
The side of the steel plate of side where flipper guide is pressed against respectively, measures the distance between two described flipper guides, as described steel
The Breadth Maximum W of plate.
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|---|---|---|---|---|
| JPH09239401A (en) * | 1996-03-06 | 1997-09-16 | Kawasaki Steel Corp | Method for rolling wide flange shape |
| JP2001300615A (en) * | 2000-04-26 | 2001-10-30 | Sumitomo Metal Ind Ltd | Apparatus and method for rolling metallic sheet |
| CN102921740A (en) * | 2011-08-09 | 2013-02-13 | 宝山钢铁股份有限公司 | Method for controlling width deviation of head and tail of hot rolled strip |
| CN104511481A (en) * | 2013-09-26 | 2015-04-15 | 宝山钢铁股份有限公司 | Multi-target rough rolling width long-travel control method |
| CN105195525A (en) * | 2014-06-25 | 2015-12-30 | 宝山钢铁股份有限公司 | Combined rolling method capable of improving plan view pattern control |
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2016
- 2016-06-27 CN CN201610479110.XA patent/CN107537864B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09239401A (en) * | 1996-03-06 | 1997-09-16 | Kawasaki Steel Corp | Method for rolling wide flange shape |
| JP2001300615A (en) * | 2000-04-26 | 2001-10-30 | Sumitomo Metal Ind Ltd | Apparatus and method for rolling metallic sheet |
| CN102921740A (en) * | 2011-08-09 | 2013-02-13 | 宝山钢铁股份有限公司 | Method for controlling width deviation of head and tail of hot rolled strip |
| CN104511481A (en) * | 2013-09-26 | 2015-04-15 | 宝山钢铁股份有限公司 | Multi-target rough rolling width long-travel control method |
| CN105195525A (en) * | 2014-06-25 | 2015-12-30 | 宝山钢铁股份有限公司 | Combined rolling method capable of improving plan view pattern control |
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