CN105032945A  Method for evaluating strip shape and strip crown comprehensive control capacity of hot continuous rolling mill  Google Patents
Method for evaluating strip shape and strip crown comprehensive control capacity of hot continuous rolling mill Download PDFInfo
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 CN105032945A CN105032945A CN201510395588.XA CN201510395588A CN105032945A CN 105032945 A CN105032945 A CN 105032945A CN 201510395588 A CN201510395588 A CN 201510395588A CN 105032945 A CN105032945 A CN 105032945A
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 238000005098 hot rolling Methods 0.000 claims description 10
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 239000003921 oils Substances 0.000 claims description 8
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Abstract
The invention discloses a method for evaluating the strip shape and strip crown comprehensive control capacity of a hot continuous rolling mill. The method mainly includes the following computerexecuted steps that 1, rolling mill parameters and strip technological parameters are collected; 2, the maximum crown and the minimum crown allowed when the strip crown of a tail mill stand is within an allowable deviation range and the strip shape of each mill stand is good are calculated according to the strip technological parameters; 3, the maximum crown and the minimum crown, formed when the strip shape control parameters of each mill stand reach an ultimate state, of a load roll gap are calculated according to the rolling mill parameters; 4, evaluation indexes of the strip shape and strip crown control capacity of each mill stand of the hot continuous rolling mill and evaluation indexes of the strip shape and strip crown comprehensive control capacity of the hot continuous rolling mill are formed. According to the method for evaluating the strip shape and strip crown comprehensive control capacity of the hot continuous rolling mill, the rolling mill strip shape control parameters and the rolled strip technological parameters are comprehensively considered, the strip shape and strip crown comprehensive control capacity of the hot continuous rolling mill is quantitatively evaluated to achieve the purpose of producing strips meeting strip shape and strip crown quality requirements, and therefore the evaluation result accords with actual production conditions better.
Description
Technical field
The invention belongs to metallurgy rolling technical field, particularly a kind of hot tandem plate shape and plate convexity Comprehensive Control merit rating method.
Background technology
Plate shape and plate convexity control device main is at present hydraulic bending roll, roll mandrel moves, roll intersection etc.Wherein hydraulic bending roll is development & application Strip Shape Control technology the earliest, and its operation principle changes roll roll force distribution and roll flexural deformation by rollbending device, is still widely used so far.Roll mandrel moves class rolling mill main and wants to be divided into two classes, other roll axisshifting rolling mill that one class is HC and derives from, because such milling train eliminates the contact beyond bandwidth between working roll and intermediate calender rolls, thus reduce working roll amount of deflection and strip side portion thinning, and can adjust as required, improve the ability of Strip Shape Control, thus be used widely at present, another kind of is CVC series rolling mill, this milling train adopts S type roller curve, and arrange in antisymmetry, the roll gap shape within the scope of rolling width is changed by roll shift, thus improve the plate shape and plate convexity control ability of milling train.Typical roll cross milling train is PC milling train, is intersected in pairs and makes minimum clearance between doubleworking along plate width direction parabolic shape symmetrically, thus produce plate shape and plate convexity control effect by top and bottom rolls.Current HC series model is mainly used in cold rolling, and the main type that continuous hotrolling mill uses is normal fourroller, CVC fourhigh mill and PC fourhigh mill.
Both at home and abroad the plate shape of various different continuous hotrolling mill type and strip crown control ability are carried out analyzing widely, but all analyses are conceived to all merely plate shape and the strip crown control ability of milling train itself, ignoring the effective object of milling trainband, in fact the plate shape and plate convexity control ability of milling train might not produce product the best in quality by force.Only have mill capacity combined with band actual process parameter can be more realistic assay is carried out to the plate shape and plate convexity Comprehensive Control ability of milling train.
Summary of the invention
The object of the present invention is to provide a kind of hot tandem plate shape and plate convexity Comprehensive Control merit rating method, the present invention mainly considers Strip Shape Control parameter and the rolled strip technological parameter of milling train, so that the band that conforms to quality requirements can be produced for target, the plate shape and plate convexity Comprehensive Control ability of quantitative assessment continuous hotrolling mill.
Hot tandem plate shape and plate convexity Comprehensive Control merit rating method of the present invention mainly comprises the following step performed by computer:
A, collection mill data and band technological parameter, specifically comprise:
A1, collection continuous hotrolling mill parameter: tandem mill frame number n, each frame working roll barrel length L
_{wi}, each frame work roll diameter D
_{wi}, each frame backing roll barrel length L
_{bi}, each frame backing roll diameter D
_{bi}, each frame backing roll roll neck diameter D
_{bni}, each frame working roll bending cylinder spacing L
_{1i}, each frame depress oil cylinder centretocentre spacing L
_{3i}, each frame working roller curve 1 term coefficient
3 term coefficient
5 term coefficient
the initial grinding roller sideplay amount of each frame working roller
each frame backing roll roller curve 1 term coefficient
3 term coefficient
5 term coefficient
each frame work roll bending power upper and lower limit
each frame working roll roll shifting amount upper and lower limit
each breast roller angle of the crossing upper and lower limit
A2, collection band technological parameter: supplied materials width B, supplied materials thickness
supplied materials convexity C
_{0}, each stand stretch drag σ
_{si}, each rack outlet thickness
first frame entrance tension force T
_{0}, each rack outlet tension force T
_{i}, each frame coefficientoffrictionμ
_{i}, target convexity C
_{ob}, target convexity allows upper lower deviation tol;
B, calculate the minimax convexity allowed when last frame band convexity is within the scope of tolerance and each frame plate shape is good according to band technological parameter, specifically comprise:
B1, make i=n;
B2, calculate last rack outlet convexity allow maximum C
_{maxn}=C
_{ob}+ tol;
B3, calculate last rack outlet convexity allow minimum of a value C
_{minn}=C
_{ob}tol;
B4, according to equal proportion convexity principle calculate the ith1 rack outlet convexity maximum
B5, according to equal proportion convexity principle calculate the ith1 rack outlet convexity minimum of a value
B6, judge whether i=2 sets up, if set up, proceed to b7; Otherwise, make i=i1, proceed to b4;
B7, make i=1, intermediate variable C
_{max0}=C
_{0};
B8, judgement
be greater than
whether set up, if set up, proceed to b9; Otherwise, proceed to b10;
B9, make C
_{maxi1}=C
_{maxi1}+ 0.05C
_{maxi1}, proceed to b8;
B10, judgement
be less than
whether set up, if set up, proceed to b11; Otherwise, proceed to b12;
B11, make C
_{maxi1}=C
_{maxi1}0.05C
_{maxi1}, proceed to b10;
B12, judge whether i=n sets up, if set up, proceed to b13; Otherwise, make i=i+1, proceed to b8;
B13, make i=1, intermediate variable C
_{min0}=C
_{0};
B14, judgement
be greater than
whether set up, if set up, proceed to b15; Otherwise, proceed to b16;
B15, C
_{mini1}=C
_{mini1}+ 0.05C
_{mini1}, proceed to b14;
B16, judgement
be less than
whether set up, if set up, proceed to b17; Otherwise proceed to b18;
B17, make C
_{mini1}=C
_{mini1}0.05C
_{mini1}, proceed to b16;
B18, judge whether i=n sets up, if set up, proceed to c; Otherwise, make i=i+1, proceed to b14;
C, to calculate according to mill data each frame plate shape controling parameters reach capacity state time loading roll gap minimax convexity, specifically comprise:
C1, make i=1;
C2, by band technological parameter supplied materials width B, supplied materials thickness
each stand stretch drag setpoint σ
_{si}, each rack outlet thickness
first frame entrance tension force T
_{0}, each rack outlet tension force T
_{i}, each frame coefficientoffrictionμ
_{i}as input parameter, according to rollforce formulae discovery ith frame rollforce P
_{i};
C3, make the ith frame work roll bending power
ith frame working roll roll shifting amount
the ith breast roller angle of the crossing
by the ith frame rollforce P
_{i}, the ith frame working roll barrel length L
_{wi}, work roll diameter D
_{wi}, backing roll barrel length L
_{bi}, backing roll diameter D
_{bi}, backing roll roll neck diameter D
_{bni}, working roll bending cylinder spacing L
_{1i}, depress oil cylinder centretocentre spacing L
_{3i}, working roller C
_{wi}, backing roll roll shape C
_{bi}and S
_{1i}, RS
_{wi}, θ
_{i}as input parameter, according to roll elastic deformation theory calculate ith frame loading roll gap convexity maximum
C4, make the ith frame work roll bending power
ith frame working roll roll shifting amount
the ith breast roller angle of the crossing
by the ith frame rollforce P
_{i}, the ith frame working roll barrel length L
_{wi}, work roll diameter D
_{wi}, backing roll barrel length L
_{bi}, backing roll diameter D
_{bi}, backing roll roll neck diameter D
_{bni}, working roll bending cylinder spacing L
_{1i}, depress oil cylinder centretocentre spacing L
_{3i}, working roller C
_{wi}, backing roll roll shape C
_{bi}and S
_{1i}, RS
_{wi}, θ
_{i}as input parameter, according to roll elastic deformation theory calculate ith frame loading roll gap convexity minimum of a value
C5, judge whether i=n sets up, if set up, proceed to d; If be false, make i=i+1, proceed to c2;
D, formation hot tandem each frame plate shape and plate convexity control ability evaluation index index
_{i}with continuous hotrolling mill plate shape and plate convexity Comprehensive Control indexes of capability evaluation index, specifically comprise:
D1, make i=1;
D2, judgement
and
whether set up, if set up, order
${\mathrm{index}}_{i}=({C}_{\mathrm{max}i}^{m}{C}_{\mathrm{min}i}^{m})/({C}_{\mathrm{max}i}{C}_{\mathrm{min}i}),$ Proceed to d8; Otherwise, proceed to d3;
D3, judgement
and
whether set up, if set up, make index
_{i}=1, proceed to d8; Otherwise, proceed to d4;
D4, judgement
whether set up, if set up, make index
_{i}=0, proceed to d8; Otherwise, proceed to d5;
D5, judgement
whether set up, if set up, make index
_{i}=0, proceed to d8; Otherwise, proceed to d6;
D6, judgement
and
whether set up, if set up, order
${\mathrm{index}}_{i}=({C}_{\mathrm{max}i}{C}_{\mathrm{min}i}^{m})/({C}_{\mathrm{max}i}{C}_{\mathrm{min}i}),$ Proceed to d8; Otherwise, proceed to d7;
D7, order
${\mathrm{index}}_{i}=({C}_{\mathrm{max}i}^{m}{C}_{\mathrm{min}i})/({C}_{\mathrm{max}i}{C}_{\mathrm{min}i}),$ Proceed to d8;
D8, judge whether i=n sets up, if set up, proceed to d9; If be false, make i=i+1, proceed to d2;
D9, calculating
numerical value according to index is evaluated hot tandem plate shape and plate convexity Comprehensive Control ability, the span of index is 0 ~ n, its numerical value is larger, prove that milling train is stronger for given Strip Shape strip crown Comprehensive Control ability, its numerical value is less, prove that milling train is more weak for given Strip Shape strip crown Comprehensive Control ability, terminate.
The present invention compared with prior art tool has the following advantages:
The present invention is when the plate shape and plate convexity control ability of carrying out continuous hotrolling mill is evaluated, not only consider the tool of productionthe control ability of milling train itself, also contemplate workpiecethe control ability that band itself needs, ejecting plate shape and the completely qualified specific standard band of strip crown whether can be produced by a set of specific tandem mill of quantitative assessment by the present invention, both can ensure that the control ability of milling train meets needs of production, can avoid again the waste of milling train control ability and equipment investment.
Accompanying drawing explanation
Fig. 1 is that the present invention calculates general flow chart.
Fig. 2 is the calculation flow chart of step b of the present invention.
Fig. 3 is the calculation flow chart of step c of the present invention.
Fig. 4 is the calculation flow chart of steps d of the present invention.
Detailed description of the invention
Embodiment 1
A kind of hot tandem plate shape and plate convexity Comprehensive Control merit rating method, to the evaluation procedure of certain 6 frame normal fourroller hot tandem plate shape and plate convexity Comprehensive Control ability, as shown in Figure 1, first in step a, collect mill data and band technological parameter, specifically comprise:
A1, collect continuous hotrolling mill parameter: tandem mill frame number is 6, each frame working roll barrel length is 1750mm, each frame work roll diameter is 710mm, each frame backing roll barrel length is 1750mm, each frame backing roll diameter is 1430mm, each frame backing roll roll neck diameter is 955mm, each frame working roll bending cylinder spacing is 3000mm, each frame depress oil cylinder centretocentre spacing is 2900mm, each frame working roller curve 1 term coefficient is 0mm, 3 term coefficient are 0mm, 5 term coefficient are 0mm, the initial grinding roller deviation of each frame working roller curve is 0mm, each frame backing roll roller curve 1 term coefficient is 0mm, 3 term coefficient are 0mm, 5 term coefficient are 0mm, in each frame work roll bending power, lower limit is respectively 1500kN, 0, in each frame working roll roll shifting amount, lower limit is respectively 0mm, 0mm, on each breast roller angle of the crossing, under be 0, namely milling train is without roll roll shifting and interleaving function,
A2, collect band technological parameter: supplied materials width 1550mm, supplied materials thickness 40mm, supplied materials convexity 0.8mm, first stand stretch drag is 132MPa, second stand stretch drag is 158MPa, 3rd stand stretch drag is 174MPa, 4th stand stretch drag is 184MPa, 5th stand stretch drag is 190MPa, 6th stand stretch drag is 181MPa, first rack outlet thickness is 23.7mm, second rack outlet thickness is 14.04mm, 3rd rack outlet thickness is 9.27mm, 4th rack outlet thickness is 6.71mm, 5th rack outlet thickness is 5.05mm, 6th rack outlet thickness is 4.11mm, first frame entrance tension force and each rack outlet tension force are 0, each frame coefficient of friction is 0.3, target convexity is 0.04mm, target convexity allows upper lower deviation to be 0.02mm,
Subsequently, in stepb, as shown in Figure 2, the minimax convexity allowed when last frame band convexity is within the scope of tolerance and each frame band exit plate shape is good is calculated according to band technological parameter, allow maximum convexity to be 0.345985mm according to calculating the first frame to parameter in a, the first frame allows minimum convexity to be 0.115328mm; Second frame allows maximum convexity to be 0.204964mm, and the second frame allows minimum convexity to be 0.0683212mm; 3rd frame allows maximum convexity to be 0.135328mm, and the 3rd frame allows minimum convexity to be 0.0451095mm; 4th frame allows maximum convexity to be 0.0979562mm, and the 4th frame allows minimum convexity to be 0.0326521mm; 5th frame allows maximum convexity to be 0.0737226mm, and the 5th frame allows minimum convexity to be 0.0245742mm; 6th frame allows maximum convexity to be 0.06mm, and the 6th frame allows minimum convexity to be 0.02mm;
Subsequently, in step c, as shown in Figure 3, obtaining the first frame rollforce according to rollforce formulae discovery is 24650.4kN, second frame rollforce is 26347kN, 3rd frame rollforce is 22434.6kN, 4th frame rollforce is 18398.4kN, 5th frame rollforce is 16682.7kN, 6th frame rollforce is 11813.9kN, according to roll elastic deformation theory calculate each frame plate shape controling parameters reach capacity state time loading roll gap minimax convexity, the maximum convexity of first frame loading roll gap is 0.49992mm, the minimum convexity of first frame loading roll gap is 0.22959mm, the maximum convexity of second frame loading roll gap is 0.39239mm, and the minimum convexity of the second frame loading roll gap is 0.12227mm, the maximum convexity of 3rd frame loading roll gap is 0.21325mm, and the minimum convexity of the 3rd frame loading roll gap is0.0585mm, the maximum convexity of 4th frame loading roll gap is 0.06534mm, and the minimum convexity of the 4th frame loading roll gap is0.2084mm, the maximum convexity of 5th frame loading roll gap is 0.05372mm, and the minimum convexity of the 5th frame loading roll gap is0.1479mm, the maximum convexity of 6th frame loading roll gap is 0.08031mm, and the minimum convexity of the 6th frame loading roll gap is0.123mm,
Subsequently, in steps d, as shown in Figure 4, according to step b and step c result, the control ability evaluation index calculating the first frame is 0.5046, the control ability evaluation index of the second frame is 0.6052, the control ability evaluation index of the 3rd frame is 1, the control ability evaluation index of the 4th frame is 0.5005, the control ability evaluation index of the 5th frame is 0.5930, the control ability evaluation index of the 6th frame is 1, the comprehensive plate shape and plate convexity control ability finally obtaining hot tandem is 4.2034, differ larger with maximum 6, illustrate that this milling train has more weak plate shape and plate convexity control ability for given band, calculate and terminate.
Embodiment 2
Below provide the detailed process evaluating certain 6 frame four roller CVC hot tandem plate shape and plate convexity Comprehensive Control ability:
First, in step a, collect mill data and band technological parameter, specifically comprise:
A1, collect continuous hotrolling mill parameter: tandem mill frame number is 6, each frame working roll barrel length is 2000mm, each frame work roll diameter is 710mm, each frame backing roll barrel length is 1750mm, each frame backing roll diameter is 1430mm, each frame backing roll roll neck diameter is 955mm, each frame working roll bending cylinder spacing is 3000mm, each frame depress oil cylinder centretocentre spacing is 2900mm, and the first frame working roller curve 1 time item is0.5954mm, 3 items are 1.1696mm, 5 times item is01002mm, initial grinding roller deviation is92mm, and the second frame working roller curve 1 time item is0.5778mm, 3 items are 1.1646mm, 5 times item is0.0995mm, initial grinding roller deviation is59mm, and the 3rd frame working roller curve 1 time item is0.5458mm, 3 items are 1.0840mm, 5 times item is0.0928mm, initial grinding roller deviation is18mm, and the 4th frame working roller curve 1 time item is0.5458mm, 3 items are 1.0840mm, 5 times item is0.0928mm, initial grinding roller deviation is18mm, and the 5th frame working roller curve 1 time item is0.5458mm, 3 items are 1.0840mm, 5 times item is0.0928mm, initial grinding roller deviation is18mm, and the 6th frame working roller curve 1 time item is0.4526mm, 3 items are 0.9288mm, 5 times item is0.0796mm, initial grinding roller deviation is 0, and each frame backing roll roller curve 1 item is 0mm, 3 items are 0mm, 5 items are 0mm, in each frame work roll bending power, lower limit is respectively 1500kN, 0, in each frame working roll roll shifting amount, lower limit is respectively 125mm, 125mm, on each breast roller angle of the crossing, under be 0, namely milling train is without roll interleaving function,
A2, collect band technological parameter: supplied materials width 1550mm, supplied materials thickness 40mm, supplied materials convexity 0.8mm, first stand stretch drag is 132MPa, second stand stretch drag is 158MPa, 3rd stand stretch drag is 174MPa, 4th stand stretch drag is 184MPa, 5th stand stretch drag is 190MPa, 6th stand stretch drag is 181MPa, first rack outlet thickness is 23.7mm, second rack outlet thickness is 14.04mm, 3rd rack outlet thickness is 9.27mm, 4th rack outlet thickness is 6.71mm, 5th rack outlet thickness is 5.05mm, 6th rack outlet thickness is 4.11mm, first frame entrance tension force and each rack outlet tension force are 0, each frame coefficient of friction is 0.3, target convexity is 0.04mm, target convexity allows upper lower deviation to be 0.02mm,
Subsequently, in stepb, the minimax convexity allowed when last frame band convexity is within the scope of tolerance and each frame band exit plate shape is good is calculated according to band technological parameter, allow maximum convexity to be 0.345985mm according to calculating the first frame to parameter in a, the first frame allows minimum convexity to be 0.115328mm; Second frame allows maximum convexity to be 0.204964mm, and the second frame allows minimum convexity to be 0.0683212mm; 3rd frame allows maximum convexity to be 0.135328mm, and the 3rd frame allows minimum convexity to be 0.0451095mm; 4th frame allows maximum convexity to be 0.0979562mm, and the 4th frame allows minimum convexity to be 0.0326521mm; 5th frame allows maximum convexity to be 0.0737226mm, and the 5th frame allows minimum convexity to be 0.0245742mm; 6th frame allows maximum convexity to be 0.06mm, and the 6th frame allows minimum convexity to be 0.02mm;
Subsequently, in step c, obtaining the first frame rollforce according to rollforce formulae discovery is 24650.4kN, second frame rollforce is 26347kN, 3rd frame rollforce is 22434.6kN, 4th frame rollforce is 18398.4kN, 5th frame rollforce is 16682.7kN, 6th frame rollforce is 11813.9kN, according to roll elastic deformation theory calculate each frame plate shape controling parameters reach capacity state time loading roll gap minimax convexity, the maximum convexity of first frame loading roll gap is 0.701632mm, the minimum convexity of first frame loading roll gap is0.182918mm, the maximum convexity of second frame loading roll gap is 0.632901mm, and the minimum convexity of the second frame loading roll gap is0.252141mm, the maximum convexity of 3rd frame loading roll gap is 0.481267mm, and the minimum convexity of the 3rd frame loading roll gap is0.362954mm, the maximum convexity of 4th frame loading roll gap is 0.370794mm, and the minimum convexity of the 4th frame loading roll gap is0.473415mm, the maximum convexity of 5th frame loading roll gap is 0.358548mm, and the minimum convexity of the 5th frame loading roll gap is0.412614mm, the maximum convexity of 6th frame loading roll gap is 0.323544mm, and the minimum convexity of the 6th frame loading roll gap is0.365433mm,
Subsequently, in steps d, according to step b and step c result, the control ability evaluation index calculating the first frame is 1, the control ability evaluation index of the second frame is 1, the control ability evaluation index of the 3rd frame is 1, the control ability evaluation index of the 4th frame is 1, the control ability evaluation index of the 5th frame is 1, the control ability evaluation index of the 6th frame is 1, the comprehensive plate shape and plate convexity control ability finally obtaining hot tandem equals maximum 6, illustrate that this milling train has very strong plate shape and plate convexity control ability for given band, plate shape and the strip crown control overflow of this band can be met completely, calculate and terminate.
Claims (1)
1. a hot tandem plate shape and plate convexity Comprehensive Control merit rating method, is characterized in that: it comprises the following step performed by computer:
A, collection mill data and band technological parameter, specifically comprise:
A1, collection continuous hotrolling mill parameter: tandem mill frame number n, each frame working roll barrel length L
_{wi}, each frame work roll diameter D
_{wi}, each frame backing roll barrel length L
_{bi}, each frame backing roll diameter D
_{bi}, each frame backing roll roll neck diameter D
_{bni}, each frame working roll bending cylinder spacing L
_{1i}, each frame depress oil cylinder centretocentre spacing L
_{3i}, each frame working roller curve 1 term coefficient
3 term coefficient
5 term coefficient
the initial grinding roller sideplay amount of each frame working roller
each frame backing roll roller curve 1 term coefficient
3 term coefficient
5 term coefficient
each frame work roll bending power upper and lower limit
each frame working roll roll shifting amount upper and lower limit
each breast roller angle of the crossing upper and lower limit
A2, collection band technological parameter: supplied materials width B, supplied materials thickness
supplied materials convexity C
_{0}, each stand stretch drag σ
_{si}, each rack outlet thickness
first frame entrance tension force T
_{0}, each rack outlet tension force T
_{i}, each frame coefficientoffrictionμ
_{i}, target convexity C
_{ob}, target convexity allows upper lower deviation tol;
B, calculate the minimax convexity allowed when last frame band convexity is within the scope of tolerance and each frame plate shape is good according to band technological parameter, specifically comprise:
B1, make i=n;
B2, calculate last rack outlet convexity allow maximum C
_{maxn}=C
_{ob}+ tol;
B3, calculate last rack outlet convexity allow minimum of a value C
_{minn}=C
_{ob}tol;
B4, according to equal proportion convexity principle calculate the ith1 rack outlet convexity maximum
B5, according to equal proportion convexity principle calculate the ith1 rack outlet convexity minimum of a value
B6, judge whether i=2 sets up, if set up, proceed to b7; Otherwise, make i=i1, proceed to b4;
B7, make i=1, intermediate variable C
_{max0}=C
_{0};
B8, judgement
be greater than
whether set up, if set up, proceed to b9; Otherwise, proceed to b10;
B9, make C
_{maxi1}=C
_{maxi1}+ 0.05C
_{maxi1}, proceed to b8;
B10, judgement
be less than
whether set up, if set up, proceed to b11; Otherwise, proceed to b12;
B11, make C
_{maxi1}=C
_{maxi1}0.05C
_{maxi1}, proceed to b10;
B12, judge whether i=n sets up, if set up, proceed to b13; Otherwise, make i=i+1, proceed to b8;
B13, make i=1, intermediate variable C
_{min0}=C
_{0};
B14, judgement
be greater than
whether set up, if set up, proceed to b15; Otherwise, proceed to b16;
B15, C
_{mini1}=C
_{mini1}+ 0.05C
_{mini1}, proceed to b14;
B16, judgement
be less than
whether set up, if set up, proceed to b17; Otherwise proceed to b18;
B17, make C
_{mini1}=C
_{mini1}0.05C
_{mini1}, proceed to b16;
B18, judge whether i=n sets up, if set up, proceed to c; Otherwise, make i=i+1, proceed to b14;
C, to calculate according to mill data each frame plate shape controling parameters reach capacity state time loading roll gap minimax convexity, specifically comprise:
C1, make i=1;
C2, by band technological parameter supplied materials width B, supplied materials thickness
each stand stretch drag setpoint σ
_{si}, each rack outlet thickness
first frame entrance tension force T
_{0}, each rack outlet tension force T
_{i}, each frame coefficientoffrictionμ
_{i}as input parameter, according to rollforce formulae discovery ith frame rollforce P
_{i};
C3, make the ith frame work roll bending power
ith frame working roll roll shifting amount
the ith breast roller angle of the crossing
by the ith frame rollforce P
_{i}, the ith frame working roll barrel length L
_{wi}, work roll diameter D
_{wi}, backing roll barrel length L
_{bi}, backing roll diameter D
_{bi}, backing roll roll neck diameter D
_{bni}, working roll bending cylinder spacing L
_{1i}, depress oil cylinder centretocentre spacing L
_{3i}, working roller C
_{wi}, backing roll roll shape C
_{bi}and S
_{1i}, RS
_{wi}, θ
_{i}as input parameter, according to roll elastic deformation theory calculate ith frame loading roll gap convexity maximum
C4, make the ith frame work roll bending power
ith frame working roll roll shifting amount
the ith breast roller angle of the crossing
by the ith frame rollforce P
_{i}, the ith frame working roll barrel length L
_{wi}, work roll diameter D
_{wi}, backing roll barrel length L
_{bi}, backing roll diameter D
_{bi}, backing roll roll neck diameter D
_{bni}, working roll bending cylinder spacing L
_{1i}, depress oil cylinder centretocentre spacing L
_{3i}, working roller C
_{wi}, backing roll roll shape C
_{bi}and S
_{1i}, RS
_{wi}, θ
_{i}as input parameter, according to roll elastic deformation theory calculate ith frame loading roll gap convexity minimum of a value
C5, judge whether i=n sets up, if set up, proceed to d; If be false, make i=i+1, proceed to c2;
D, formation hot tandem each frame plate shape and plate convexity control ability evaluation index index
_{i}with continuous hotrolling mill plate shape and plate convexity Comprehensive Control indexes of capability evaluation index, specifically comprise:
D1, make i=1;
D2, judgement
and
whether set up, if set up, order
${\mathrm{index}}_{i}=({C}_{\mathrm{max}i}^{m}{C}_{\mathrm{min}i}^{m})/({C}_{\mathrm{max}i}{C}_{\mathrm{min}i}),$ Proceed to d8; Otherwise, proceed to d3;
D3, judgement
and
whether set up, if set up, make index
_{i}=1, proceed to d8; Otherwise, proceed to d4;
D4, judgement
whether set up, if set up, make index
_{i}=0, proceed to d8; Otherwise, proceed to d5;
D5, judgement
whether set up, if set up, make index
_{i}=0, proceed to d8; Otherwise, proceed to d6;
D6, judgement
and
whether set up, if set up, order
${\mathrm{index}}_{i}=({C}_{\mathrm{max}i}{C}_{\mathrm{min}i}^{m})/({C}_{\mathrm{max}i}{C}_{\mathrm{min}i}),$ Proceed to d8; Otherwise, proceed to d7;
D7, order
${\mathrm{index}}_{i}=({C}_{\mathrm{max}i}^{m}{C}_{\mathrm{min}i})/({C}_{\mathrm{max}i}{C}_{\mathrm{min}i}),$ Proceed to d8;
D8, judge whether i=n sets up, if set up, proceed to d9; If be false, make i=i+1, proceed to d2;
D9, calculating
numerical value according to index is evaluated hot tandem plate shape and plate convexity Comprehensive Control ability, the span of index is 0 ~ n, its numerical value is larger, prove that milling train is stronger for given Strip Shape strip crown Comprehensive Control ability, its numerical value is less, prove that milling train is more weak for given Strip Shape strip crown Comprehensive Control ability, terminate.
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