CN105032945A - Method for evaluating strip shape and strip crown comprehensive control capacity of hot continuous rolling mill - Google Patents

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 computer-executed 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

A kind of hot tandem plate shape and plate convexity Comprehensive Control merit rating method

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 roll-bending 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 double-working 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 hot-rolling mill uses is normal four-roller, CVC four-high mill and PC four-high mill.

Both at home and abroad the plate shape of various different continuous hot-rolling 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 train---band, 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 hot-rolling 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 hot-rolling 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 centre-to-centre spacing L _3i, each frame working roller curve 1 term coefficient 3 term coefficient 5 term coefficient the initial grinding roller side-play 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 i-th-1 rack outlet convexity maximum

B5, according to equal proportion convexity principle calculate the i-th-1 rack outlet convexity minimum of a value

B6, judge whether i=2 sets up, if set up, proceed to b7; Otherwise, make i=i-1, 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 _maxi-1=C _maxi-1+ 0.05|C _maxi-1|, proceed to b8;

B10, judgement be less than whether set up, if set up, proceed to b11; Otherwise, proceed to b12;

B11, make C _maxi-1=C _maxi-1-0.05|C _maxi-1|, 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 _mini-1=C _mini-1+ 0.05|C _mini-1|, proceed to b14;

B16, judgement be less than whether set up, if set up, proceed to b17; Otherwise proceed to b18;

B17, make C _mini-1=C _mini-1-0.05|C _mini-1|, 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 set-point σ _si, each rack outlet thickness first frame entrance tension force T ₀, each rack outlet tension force T _i, each frame coefficientoffrictionμ _ias input parameter, according to roll-force formulae discovery i-th frame roll-force P _i;

C3, make the i-th frame work roll bending power i-th frame working roll roll shifting amount the i-th breast roller angle of the crossing by the i-th frame roll-force P _i, the i-th 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 centre-to-centre spacing L _3i, working roller C _wi, backing roll roll shape C _biand S _1i, RS _wi, θ _ias input parameter, according to roll elastic deformation theory calculate i-th frame loading roll gap convexity maximum

C4, make the i-th frame work roll bending power i-th frame working roll roll shifting amount the i-th breast roller angle of the crossing by the i-th frame roll-force P _i, the i-th 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 centre-to-centre spacing L _3i, working roller C _wi, backing roll roll shape C _biand S _1i, RS _wi, θ _ias input parameter, according to roll elastic deformation theory calculate i-th 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 _iwith continuous hot-rolling 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 ${\mathrm{index}}_i=(C_{\max i}^m-C_{\min i}^m)/(C_{\max i}-C_{\min i}),$ 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 ${\mathrm{index}}_i=(C_{\max i}-C_{\min i}^m)/(C_{\max i}-C_{\min i}),$ Proceed to d8; Otherwise, proceed to d7;

D7, order ${\mathrm{index}}_i=(C_{\max i}^m-C_{\min i})/(C_{\max i}-C_{\min i}),$ 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 hot-rolling mill is evaluated, not only consider the tool of production---the control ability of milling train itself, also contemplate workpiece---the 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 four-roller 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 hot-rolling 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 centre-to-centre 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 roll-force according to roll-force formulae discovery is 24650.4kN, second frame roll-force is 26347kN, 3rd frame roll-force is 22434.6kN, 4th frame roll-force is 18398.4kN, 5th frame roll-force is 16682.7kN, 6th frame roll-force 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 is-0.0585mm, the maximum convexity of 4th frame loading roll gap is 0.06534mm, and the minimum convexity of the 4th frame loading roll gap is-0.2084mm, the maximum convexity of 5th frame loading roll gap is 0.05372mm, and the minimum convexity of the 5th frame loading roll gap is-0.1479mm, the maximum convexity of 6th frame loading roll gap is 0.08031mm, and the minimum convexity of the 6th frame loading roll gap is-0.123mm,

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 hot-rolling 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 centre-to-centre spacing is 2900mm, and the first frame working roller curve 1 time item is-0.5954mm, 3 items are 1.1696mm, 5 times item is-01002mm, initial grinding roller deviation is-92mm, and the second frame working roller curve 1 time item is-0.5778mm, 3 items are 1.1646mm, 5 times item is-0.0995mm, initial grinding roller deviation is-59mm, and the 3rd frame working roller curve 1 time item is-0.5458mm, 3 items are 1.0840mm, 5 times item is-0.0928mm, initial grinding roller deviation is-18mm, and the 4th frame working roller curve 1 time item is-0.5458mm, 3 items are 1.0840mm, 5 times item is-0.0928mm, initial grinding roller deviation is-18mm, and the 5th frame working roller curve 1 time item is-0.5458mm, 3 items are 1.0840mm, 5 times item is-0.0928mm, initial grinding roller deviation is-18mm, and the 6th frame working roller curve 1 time item is-0.4526mm, 3 items are 0.9288mm, 5 times item is-0.0796mm, 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 roll-force according to roll-force formulae discovery is 24650.4kN, second frame roll-force is 26347kN, 3rd frame roll-force is 22434.6kN, 4th frame roll-force is 18398.4kN, 5th frame roll-force is 16682.7kN, 6th frame roll-force 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 is-0.182918mm, the maximum convexity of second frame loading roll gap is 0.632901mm, and the minimum convexity of the second frame loading roll gap is-0.252141mm, the maximum convexity of 3rd frame loading roll gap is 0.481267mm, and the minimum convexity of the 3rd frame loading roll gap is-0.362954mm, the maximum convexity of 4th frame loading roll gap is 0.370794mm, and the minimum convexity of the 4th frame loading roll gap is-0.473415mm, the maximum convexity of 5th frame loading roll gap is 0.358548mm, and the minimum convexity of the 5th frame loading roll gap is-0.412614mm, the maximum convexity of 6th frame loading roll gap is 0.323544mm, and the minimum convexity of the 6th frame loading roll gap is-0.365433mm,

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 hot-rolling 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 centre-to-centre spacing L _3i, each frame working roller curve 1 term coefficient 3 term coefficient 5 term coefficient the initial grinding roller side-play 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 i-th-1 rack outlet convexity maximum

B5, according to equal proportion convexity principle calculate the i-th-1 rack outlet convexity minimum of a value

B6, judge whether i=2 sets up, if set up, proceed to b7; Otherwise, make i=i-1, 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 _maxi-1=C _maxi-1+ 0.05|C _maxi-1|, proceed to b8;

B10, judgement be less than whether set up, if set up, proceed to b11; Otherwise, proceed to b12;

B11, make C _maxi-1=C _maxi-1-0.05|C _maxi-1|, 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 _mini-1=C _mini-1+ 0.05|C _mini-1|, proceed to b14;

B16, judgement be less than whether set up, if set up, proceed to b17; Otherwise proceed to b18;

B17, make C _mini-1=C _mini-1-0.05|C _mini-1|, 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 set-point σ _si, each rack outlet thickness first frame entrance tension force T ₀, each rack outlet tension force T _i, each frame coefficientoffrictionμ _ias input parameter, according to roll-force formulae discovery i-th frame roll-force P _i;

C3, make the i-th frame work roll bending power i-th frame working roll roll shifting amount the i-th breast roller angle of the crossing by the i-th frame roll-force P _i, the i-th 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 centre-to-centre spacing L _3i, working roller C _wi, backing roll roll shape C _biand S _1i, RS _wi, θ _ias input parameter, according to roll elastic deformation theory calculate i-th frame loading roll gap convexity maximum

C4, make the i-th frame work roll bending power i-th frame working roll roll shifting amount the i-th breast roller angle of the crossing by the i-th frame roll-force P _i, the i-th 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 centre-to-centre spacing L _3i, working roller C _wi, backing roll roll shape C _biand S _1i, RS _wi, θ _ias input parameter, according to roll elastic deformation theory calculate i-th 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 _iwith continuous hot-rolling 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 ${\mathrm{index}}_i=(C_{\max i}^m-C_{\min i}^m)/(C_{\max i}-C_{\min i}),$ 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 ${\mathrm{index}}_i=(C_{\max i}-C_{\min i}^m)/(C_{\max i}-C_{\min i}),$ Proceed to d8; Otherwise, proceed to d7;

D7, order ${\mathrm{index}}_i=(C_{\max i}^m-C_{\min i})/(C_{\max i}-C_{\min i}),$ 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.