CN103586286B  Rolling schedule comprehensive optimization method for cold continuous rolling unit taking scratch prevention as objective  Google Patents
Rolling schedule comprehensive optimization method for cold continuous rolling unit taking scratch prevention as objective Download PDFInfo
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 CN103586286B CN103586286B CN201310562412.XA CN201310562412A CN103586286B CN 103586286 B CN103586286 B CN 103586286B CN 201310562412 A CN201310562412 A CN 201310562412A CN 103586286 B CN103586286 B CN 103586286B
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 238000005457 optimization Methods 0.000 title claims abstract description 23
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Abstract
A rolling schedule comprehensive optimization method for a cold continuous rolling unit taking scratch prevention as an objective mainly comprises the following steps that 1, main equipment and technological parameters of the cold continuous rolling unit with five machine frames are collected; 2 procedure parameters involved in a rolling schedule optimization procedure are defined; 3, the ability of the unit to regulate the outlet plate shapes is improved; 4, initial values of reduction rates epsilon<i0> of the first machine frame, the second machine frame, the third machine frame and the fourth machine frame and initial values of outlet tension force T<i0> of the first machine frame, the second machine frame, the third machine frame and the fourth machine frame are given; 5, an initial value of the reduction rate of the fifth machine frame is calculated; 6, rolling pressure, rolling power, slipping factors, and the outlet plate shape value of each machine frame are calculated; 7, the value of a scratch comprehensive judgment index lambada<i> of each machine frame is calculated; 8, an optimized objective function is calculated; 9 the optimal rolling schedule is output; the steps are executed through a computer. By means of the rolling schedule comprehensive optimization method, the scratch comprehensive judgment index of each machine frame can be predicted accurately, the occurrence possibility of scratch defects is reduced to the greatest extent, production efficiency is increased, and outlet surface quality of strip steel is improved.
Description
Technical field
The present invention relates to cold rolling field, particularly the tandem mills rolling procedure comprehensive optimization method that is target with plucking control.
Background technology
In recent years, due to the great demand of the industries such as household electrical appliance, automobile, electronics, space flight, strip is produced and obtains fast development.Meanwhile, along with most of strip user is turned to highend by low side, more and more higher requirement is proposed to the surface quality of band steel.And in cold continuous rolling production process, be easy to produce plucking at roller surface, and constantly duplicate in belt steel surface, and the galling defect of belt steel surface has considerable influence to product surface quality, its essential characteristic is the white bright line occurred continuously along entire volume length in band steel upper and lower surface.Galling defect sometimes scene also claims cut.For galling defect, the scholars such as Xu Jun, Qiu Gejun are followed the tracks of by a large amount of field trials, show that galling defect is this conclusion caused owing to skidding at a high speed between roll and band
^{[12]}, but do not explain that the plucking why occurred after band steel and roll skid at a high speed is elongate instead of other form, the research yet not deep to its mechanism produced.Further following the tracks of discovery by scene, all can there is galling defect in the coil of strip that not all generation is skidded at a high speed, and the degree that galling defect occurs is except having relation with rolling schedule and tension schedule
^{[3]}, also with the content of iron powder in emulsion, be with the intensity of steel closely related.In the past, the angle also having scholar to prevent and treat from plucking, was optimized setting to rolling procedure
^{[1]}, but in the computational process on plucking comprehensive descision index, only only considered the impact of mill speed and slip factor, and do not consider to be with hardness of steel, the factors such as emulsion iron content, cause onthespot inaccurate to plucking comprehensive descision indices prediction, the generation of galling defect cannot be effected a radical cure, have impact on the production efficiency of unit greatly, like this, how plucking comprehensive descision index is revised, improve the forecast precision of plucking comprehensive descision index and setting is optimized to rolling procedure reduces the emphasis that probability that galling defect occurs is still onthespot tackling key problem.
(bibliography: [1] Qiu Gejun, Sun Jun, Bai Zhenhua .1220 cold continuous rolling nick mechanism and analysis of Influential Factors [J]. metallurgical equipment, 2007,3:2326. [2] Bai Zhenhua. cold continuous rolling high speed manufacturing processes core process Mathematical Modeling [M]. Beijing: China Machine Press, 2009. [3] Sun Jianlin. rolling mill practice lubrication principle technology and application [M]. metallurgical industry publishing house, 2004,1.)
Summary of the invention
Inaccurate to plucking comprehensive descision indices prediction for scene, the object of the present invention is to provide the rolling procedure comprehensive optimization method that the tandem mills very easily producing galling defect probability in a kind of energy onthespot accurate forecast plucking comprehensive descision index, reduction highspeed rolling process is target with plucking control.
In order to realize above object, the present invention by the following technical solutions:
The rolling procedure comprehensive optimization method that tandem mills is target with plucking control, comprises the following step performed by computer:
A () collects capital equipment and the technological parameter of five Stands Cold Tandem Mill groups, mainly comprise the following steps:
A1) collect the main equipment parameters of five Stands Cold Tandem Mill groups, mainly comprise: 15# frame working roll roller footpath D
_{wi}, i=1,2 ... 5,15# frame backing roll roller footpath D
_{bi}, 15# frame working roller distribution Δ D
_{wij}(j is bar unit number), 15# frame backing roll roll shape distribution Δ D
_{bij}, 15# frame working roll barrel length L
_{wi}, 15# frame backing roll barrel length L
_{bi}, 15# frame working roll bending cylinder centretocentre spacing l
_{wi}, 15# frame backing roll housing screw centretocentre spacing l
_{bi};
A2) collect the technology characteristics parameter of five Stands Cold Tandem Mill groups, mainly comprise: 15# frame permits maximum draught pressure P
_{maxi}, 15# frame permits maximum rolling power F
_{maxi}, the maximum positive bending roller force of 15# frame working roll
the maximum negative bending roller force of 15# frame working roll
15# frame relative power surplus difference license maximum
uncoiler uncoiling tension T
_{0}, coiling machine curl tension T
_{5}, the maximum outlet tension force T that allows of 14# frame relevant device
_{maxi}, the minimum outlet tension force T that allows of 14# frame relevant device
_{mini}, specific standard striprolling time 15# machine frame rolling mill maximum depression rate ε allowable
_{imax}, specific standard striprolling time 15# machine frame rolling mill minimum reduction ratio ε allowable
_{imin}, critical slip factor ψ
^{*}, last rack outlet maximum plate shape value shape
^{*}, there is the emulsion iron content critical value of galling defect
safety coefficient ξ;
A3) collect the technological parameter of band to be rolled, mainly comprise the initial strength σ of band
_{s0}, strain hardening coefficient k
_{s}, the width B of band, the thickness h of supplied materials
_{0}, finished product thickness h
_{5}, 5# frame muzzle velocity V
_{5};
A4) collect main technique lubricating regime parameter, mainly comprise each frame emulsion flow setting value flow
_{i}, emulsion initial temperature T
_{d}, concentration of emulsion used C, emulsion iron content
B procedure parameter involved in () definition rolling schedule optimization process, mainly comprises the best reduction distribution value ε of 15# frame
_{iy}, 14# frame the best outlet tension force setting value T
_{iy}, 15# frame reduction ratio setting value ε
_{i0}, 14# rack outlet tension force setting value T
_{i0}, 15# frame draught pressure P
_{i}, 15# frame rolling power F
_{i}, 15# frame slip factor ψ
_{i}, 15# frame relative power surplus w
_{i}, 15# machine frame rolling mill work roll bending power S
_{iw}, last frame band steel exit plate shape value shape;
C (), in order to improve the regulating power of unit to exit plate shape to greatest extent, makes the ith machine frame rolling mill work roll bending power
${S}_{\mathrm{iw}}=\frac{{S}_{\mathrm{iw}\mathrm{max}}^{+}{S}_{\mathrm{iw}\mathrm{max}}^{}}{2};$
(d) given 14# frame reduction ratio ε
_{i0}with 14# rack outlet tension force T
_{i0}initial value;
E () calculates the 5th frame reduction ratio initial value
${\mathrm{\ϵ}}_{50}=1\frac{{h}_{5}}{{h}_{0}(1{\mathrm{\ϵ}}_{10})(1{\mathrm{\ϵ}}_{20})(1{\mathrm{\ϵ}}_{30})(1{\mathrm{\ϵ}}_{40})};$
F () calculates current working under, the draught pressure P of each frame
_{i}, rolling power F
_{i}, slip factor ψ
_{i}, last frame band steel exit plate shape value shape;
G, in () operation of rolling, under the prerequisite considering safety coefficient, draught pressure, rolling power, slip factor and exit plate shape value all should not exceed License Value, therefore judge inequality
whether set up simultaneously, if inequality is set up, then proceed to step (h); If inequality is false, then redistributes the initial value of reduction ratio and outlet tension force, proceed to step (j);
H () calculates current working under, each frame plucking comprehensive descision index λ
_{i}value, λ
_{i}less, then represent plucking occur probability less, occurrence degree is lighter; Otherwise, plucking comprehensive descision index λ
_{i}larger, then represent plucking occur probability larger, occurrence degree is more serious.Especially, as new plucking comprehensive descision index λ
_{i}then show when≤0 that the operation of rolling there will not be galling defect, the probability that namely socalled galling defect occurs is zero, wherein plucking comprehensive descision index λ
_{i}computation model be:
λ in formulaplucking comprehensive descision index;
ψslip factor;
μcoefficient of friction;
Vband steel exports speed;
Δ hdrafts;
R 'working roll flattens radius;
T
_{in}entrance tension force;
T
_{out}outlet tension force;
Pdraught pressure;
α, γrate coefficient, closely related with the characteristic of cold continuous rolling, general α=0.81.2, γ=0.40.6;
actual iron powder content inemulsion;
there is the emulsion iron content critical value of galling defect;
In βemulsion, iron powder is to the Intrusion Index of plucking probability of happening, general β=0.70.8;
σ
_{s}the average deformation drag offrame inlet/outlet band;
ηstrength of materials to the influence coefficient of plucking probability of happening, general η=0.350.45;
(i) calculate the optimization object function under current rolling schedule
a is weight coefficient, general A=0.350.65, wherein
represent the uniformity of each frame revised plucking comprehensive descision index,
represent the overall numerical value of each frame revised plucking comprehensive descision index;
Does j () judge that Powell condition is set up (namely judging that whether objective function F minimum)? if Powell condition is set up, then make ε
_{iy}=ε
_{i0}, T
_{iy}=T
_{i0}, proceed to step (k), otherwise adjustment ε
_{i0}, T
_{i0}, proceed to step (e);
K () exports optimum rolling procedure ε
_{iy}, T
_{iy}, complete the integrated optimization and setting of the rolling procedure that tandem mills is target with plucking control.
The present invention compared with prior art tool has the following advantages:
(1) under accurate forecast goes out current working, the plucking comprehensive descision index of each frame.
(2) last rack outlet plate shape and each frame relative power allowance balance even.
(3) farthest reduce the probability that galling defect occurs, enhance productivity and improve the exit surface quality being with steel.
Accompanying drawing explanation
Fig. 1 is host computer block diagram of the present invention;
Fig. 2 is the flow chart of step a of the present invention;
Fig. 3 is the embodiment of the present invention 1 and conventional method exit plate shape curve comparison figure;
Fig. 4 is the embodiment of the present invention 2 and conventional method exit plate shape curve comparison figure.
Detailed description of the invention
Embodiment 1
The rolling procedure comprehensive optimization method that tandem mills is target with plucking control, each step as shown in Figure 1:
First, in step 1, collect the main equipment parameters of five Stands Cold Tandem Mill groups, mainly comprise: 15# frame working roll roller footpath D
_{wi}={ 538.1,474.8,495.1,527.2,528.5}mm, 15# frame backing roll roller footpath D
_{bi}={ 1218,1228.2,1325.4,1235,1304.9}mm, 15# frame working roller distribution Δ D
_{wij}=0(j is bar unit number), 15# frame backing roll roll shape distribution Δ D
_{bij}=0,15# frame working roll barrel length L
_{wi}=1220mm, 15# frame backing roll barrel length L
_{bi}=1092mm, 15# frame working roll bending cylinder centretocentre spacing l
_{wi}=2100mm, 15# frame backing roll housing screw centretocentre spacing l
_{bi}=2100mm;
Subsequently, in step 2, collect the technology characteristics parameter of five Stands Cold Tandem Mill groups, mainly comprise: 15# frame permits maximum draught pressure P
_{maxi}=2000t, 15# frame permit maximum rolling power F
_{maxi}the maximum positive bending roller force of=5000kw, 15# frame working roll
the maximum negative bending roller force of 15# frame working roll
15# frame relative power surplus difference license maximum
uncoiler uncoiling tension T
_{0}=65MPa, coiling machine curl tension T
_{5}the maximum outlet tension force T that=70MPa, 14# frame relevant device allow
_{maxi}the minimum outlet tension force T that=230MPa, 14# frame relevant device allow
_{mini}15# machine frame rolling mill maximum depression rate ε allowable when=80MPa, specific standard striprolling
_{imax}=0.45,15# machine frame rolling mill minimum reduction ratio ε allowable during specific standard striprolling
_{imin}=0.15, critical slip factor ψ
^{*}=0.42, last rack outlet maximum plate shape value shape
^{*}=15I, there is the emulsion iron content critical value of galling defect
safety coefficient ξ=0.9;
Subsequently, in step 3, collect the technological parameter of band to be rolled, mainly comprise the initial strength σ of band
_{s0}=380MPa, strain hardening coefficient k
_{s}=1.35, the width B=1005mm of band, the thickness h of supplied materials
_{0}=2.75mm, finished product thickness h
_{5}the muzzle velocity V of=0.42mm, 5# frame
_{5}=985m/min;
Subsequently, in step 4, collect main technique lubricating regime parameter, mainly comprise each frame emulsion flow setting value flow
_{i}={ 1235,987,1010,1145,1170}L/min, emulsion initial temperature T
_{d}=55 DEG C, concentration of emulsion used C=2.1%, emulsion iron content
above step as shown in Figure 2;
Subsequently, in steps of 5, procedure parameter involved in definition rolling schedule optimization process, mainly comprises the best reduction distribution value ε of 15# frame
_{iy}, 14# frame the best outlet tension force setting value T
_{iy}, 15# frame reduction ratio setting value ε
_{i0}, 14# rack outlet tension force setting value T
_{i0}, 15# frame draught pressure P
_{i}, 15# frame rolling power F
_{i}, 15# frame slip factor ψ
_{i}, 15# frame relative power surplus w
_{i}, 15# machine frame rolling mill work roll bending power S
_{iw}, last frame band steel exit plate shape value shape;
Subsequently, in step 6, the ith machine frame rolling mill work roll bending power is calculated
Subsequently, in step 7, the initial value ε of given 14# frame reduction ratio
_{i0}={ 0.35,0.35,0.35,0.35} and 14# rack outlet tension force setting initial value T
_{i0}={ 150,150,150,150}MPa;
Subsequently, in step 8, the 5th frame reduction ratio initial value is calculated
Subsequently, in step 9, under calculating current working, the draught pressure P of each frame
_{i}={ 1306.62,885.84,801.42,767.95,656.32}t, rolling power F
_{i}={ 2891.09,3735.47,3891.78,4120.46,2385.07}kw, slip factor ψ
_{i}={ 0.126,0.319,0.349,0.317,0.243}, relative power surplus w
_{i}={ the exit plate shape value shape=13.8I of 0.422,0.253,0.222,0.176,0.523}, last frame band steel;
Subsequently, in step 10, inequality is judged
whether set up, obvious inequality is set up, then proceed to step 11 simultaneously;
Subsequently, in a step 11, under calculating current working, each frame plucking comprehensive descision index λ
_{i}=0.931,3.699,6.295,8.886,7.976}, wherein rate factor alpha=1.0, γ=0.5, in emulsion, iron powder is to Intrusion Index β=0.75 of plucking probability of happening, and the strength of materials is to influence coefficient η=0.4 of plucking probability of happening;
Finally, in step 12, the optimization object function under current rolling schedule is calculated
$F=A\·\sqrt{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{({\mathrm{\λ}}_{i}\stackrel{\‾}{\mathrm{\λ}})}^{2}}+(1A)\·\stackrel{\‾}{\mathrm{\λ}}=6.02,$ $\stackrel{\‾}{\mathrm{\λ}}=\frac{1}{5}\underset{i=1}{\overset{5}{\mathrm{\Σ}}}{\mathrm{\λ}}_{i}=5.55,$ Wherein A=0.5;
Subsequently, in step 13, judge whether Powell condition is set up (namely judging that whether objective function F is minimum), and obvious condition is false, adjustment ε
_{i0}, T
_{i0}, proceed to step 8;
Finally, at step 14, optimum rolling procedure ε is exported
_{iy}={ 0.28,0.389,0.331,0.299,0.26}, T
_{iy}={ 137.28,163.68,163.68,165.44}MPa completes the rolling procedure integrated optimization and setting that tandem mills is target with plucking control.
Sets forth the distribution situation of reduction system, tension schedule and the plucking comprehensive descision index that this enforcement obtains with conventional method at Fig. 3 and table 1, and optimize the distribution situation of last rack outlet plate shape.As shown in Figure 3, plate shape value for characterizing last rack outlet strip shape quality drops to 12.10I from 14.35I, have dropped 15.68%, can be found out by table 1, object function for characterizing galling defect probability of happening drops to 5.607 from 6.176, have dropped 9.21%; Illustrate that correlation technique of the present invention can be good at reducing the probability that in highspeed rolling process, galling defect occurs, improve the quality on band steel exports surface.
The rolling procedure complex optimum result of table 1 embodiment 1 and conventional method
Embodiment 2
First, in step 1, collect the main equipment parameters of five Stands Cold Tandem Mill groups, mainly comprise: 15# frame working roll roller footpath D
_{wi}={ 525.7,482.3,493.4,526.1,522.3}mm, 15# frame backing roll roller footpath D
_{bi}={ 1275.4,1229.9,1226.9,1297,1214}mm, 15# frame working roller distribution Δ D
_{wij}=0(j is bar unit number), 15# frame backing roll roll shape distribution Δ D
_{bij}=0,15# frame working roll barrel length L
_{wi}=1220mm, 15# frame backing roll barrel length L
_{bi}=1092mm, 15# frame working roll bending cylinder centretocentre spacing l
_{wi}=2100mm, 15# frame backing roll housing screw centretocentre spacing l
_{bi}=2100mm;
Subsequently, in step 2, collect the technology characteristics parameter of five Stands Cold Tandem Mill groups, mainly comprise: 15# frame permits maximum draught pressure P
_{maxi}=2000t, 15# frame permit maximum rolling power F
_{maxi}the maximum positive bending roller force of=5000kw, 15# frame working roll
the maximum negative bending roller force of 15# frame working roll
15# frame relative power surplus difference license maximum
uncoiler uncoiling tension T
_{0}=65MPa, coiling machine curl tension T
_{5}the maximum outlet tension force T that=70MPa, 14# frame relevant device allow
_{maxi}the minimum outlet tension force T that=230MPa, 14# frame relevant device allow
_{mini}15# machine frame rolling mill maximum depression rate ε allowable when=80MPa, specific standard striprolling
_{imax}=0.45,15# machine frame rolling mill minimum reduction ratio ε allowable during specific standard striprolling
_{imin}=0.15, critical slip factor ψ
^{*}=0.40, last rack outlet maximum plate shape value shape
^{*}=11I, there is the emulsion iron content critical value of galling defect
safety coefficient ξ=0.9;
Subsequently, in step 3, collect the technological parameter of band to be rolled, mainly comprise the initial strength σ of band
_{s0}=400MPa, strain hardening coefficient k
_{s}=1.28, the width B=1003mm of band, the thickness h of supplied materials
_{0}=2.0mm, finished product thickness h
_{5}the muzzle velocity V of=0.26mm, 5# frame
_{5}=1117m/min;
Subsequently, in step 4, collect main technique lubricating regime parameter, mainly comprise each frame emulsion flow setting value flow
_{i}={ 1165,1876,1130,1065,1130}L/min, emulsion initial temperature T
_{d}=55 DEG C, concentration of emulsion used C=2.3%, emulsion iron content
Subsequently, in steps of 5, procedure parameter involved in definition rolling schedule optimization process, mainly comprises the best reduction distribution value ε of 15# frame
_{iy}, 14# frame the best outlet tension force setting value T
_{iy}, 15# frame reduction ratio setting value ε
_{i0}, 14# rack outlet tension force setting value T
_{i0}, 15# frame draught pressure P
_{i}, 15# frame rolling power F
_{i}, 15# frame slip factor ψ
_{i}, 15# frame relative power surplus w
_{i}, 15# machine frame rolling mill work roll bending power S
_{iw}, last frame band steel exit plate shape value shape;
Subsequently, in step 6, the ith machine frame rolling mill work roll bending power is calculated
Subsequently, in step 7, the initial value ε of given 14# frame reduction ratio
_{i0}={ 0.35,0.35,0.35,0.3} and 14# rack outlet tension force setting initial value T
_{i0}={ 150,150,150,150}MPa;
Subsequently, in step 8, the 5th frame reduction ratio initial value is calculated
Subsequently, in step 9, under calculating current working, the draught pressure P of each frame
_{i}={ 1163.63,801.52,718.43,680.89,807.75}t, rolling power F
_{i}={ 1744.85,2262.24,2331.41,2001.61,4159.23}kw, slip factor ψ
_{i}={ 0.121,0.287,0.328,0.252,0.324}, relative power surplus w
_{i}={ the exit plate shape value shape=9.68I of 0.651,0.548,0.534,0.6,0.168}, last frame band steel;
Subsequently, in step 10, inequality is judged
whether set up, obvious inequality is set up, then proceed to step 11 simultaneously;
Subsequently, in a step 11, under calculating current working, each frame plucking comprehensive descision index λ
_{i}=0.728,2.710,4.821,5.323,11.68}, wherein rate factor alpha=1.0, γ=0.5, in emulsion, iron powder is to Intrusion Index β=0.75 of plucking probability of happening, and the strength of materials is to influence coefficient η=0.4 of plucking probability of happening;
Finally, in step 12, the optimization object function under current rolling schedule is calculated
$F=A\·\sqrt{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{({\mathrm{\λ}}_{i}\stackrel{\‾}{\mathrm{\λ}})}^{2}}+(1A)\·\stackrel{\‾}{\mathrm{\λ}}=6.656,$ $\stackrel{\‾}{\mathrm{\λ}}=\frac{1}{5}\underset{i=1}{\overset{5}{\mathrm{\Σ}}}{\mathrm{\λ}}_{i}=5.052,$ Wherein A=0.5;
Subsequently, in step 13, judge whether Powell condition is set up (namely judging that whether objective function F is minimum), and obvious condition is false, adjustment ε
_{i0}, T
_{i0}, proceed to step 8;
Finally, at step 14, optimum rolling procedure ε i is exported
_{y}={ 0.3,0.387,0.356,0.348,0.278}, T
_{iy}={ 137.59,152.70,151.70,155.82}MPa completes the rolling procedure integrated optimization and setting that tandem mills is target with plucking control.
The reduction system that this enforcement and conventional method obtain is sets forth at Fig. 4 and table 2, the distribution situation of tension schedule and plucking comprehensive descision index, and optimize the distribution situation of last rack outlet plate shape, as shown in Figure 4, plate shape value for characterizing last rack outlet strip shape quality drops to 9.17I from 10.44I, have dropped 12.16%, can be found out by table 2, object function for characterizing galling defect probability of happening drops to 5.930 from 6.683, have dropped 11.27%, illustrate that correlation technique of the present invention can be good at reducing the probability that in highspeed rolling process, galling defect occurs, improve the quality on band steel exports surface.
Table 2: the rolling procedure complex optimum result of embodiment 2 and conventional method
Claims (2)
1. the tandem mills rolling procedure comprehensive optimization method that is target with plucking control, is characterized in that: it comprises the following step performed by computer:
A () collects capital equipment and the technological parameter of five Stands Cold Tandem Mill groups, comprise the following steps:
A1) collect the main equipment parameters of five Stands Cold Tandem Mill groups, mainly comprise: 15# frame working roll roller footpath D
_{wi}, i=1,2 ... 5,15# frame backing roll roller footpath D
_{bi}, 15# frame working roller distribution Δ D
_{wij}(j is bar unit number), 15# frame backing roll roll shape distribution Δ D
_{bij}, 15# frame working roll barrel length L
_{wi}, 15# frame backing roll barrel length L
_{bi}, 15# frame working roll bending cylinder centretocentre spacing l
_{wi}, 15# frame backing roll housing screw centretocentre spacing l
_{bi};
A2) collect the technology characteristics parameter of five Stands Cold Tandem Mill groups, mainly comprise: 15# frame permits maximum draught pressure P
_{maxi}, 15# frame permits maximum rolling power F
_{maxi}, the maximum positive bending roller force of 15# frame working roll
the maximum negative bending roller force of 15# frame working roll
15# frame relative power surplus difference license maximum
uncoiler uncoiling tension T
_{0}, coiling machine curl tension T
_{5}, the maximum outlet tension force T that allows of 14# frame relevant device
_{maxi}, the minimum outlet tension force T that allows of 14# frame relevant device
_{mini}, specific standard striprolling time 15# machine frame rolling mill maximum depression rate ε allowable
_{imax}, specific standard striprolling time 15# machine frame rolling mill minimum reduction ratio ε allowable
_{imin}, critical slip factor ψ
^{*}, last rack outlet maximum plate shape value shape
^{*}, there is the emulsion iron content critical value of galling defect
safety coefficient ξ;
A3) collect the technological parameter of band to be rolled, mainly comprise the initial strength σ of band
_{s0}, strain hardening coefficient k
_{s}, the width B of band, the thickness h of supplied materials
_{0}, finished product thickness h
_{5}, 5# frame muzzle velocity V
_{5};
A4) collect main technique lubricating regime parameter, mainly comprise each frame emulsion flow setting value flow
_{i}, emulsion initial temperature T
_{d}, concentration of emulsion used C, emulsion iron content
B procedure parameter involved in () definition rolling schedule optimization process, mainly comprises the best reduction distribution value ε of 15# frame
_{iy}, 14# frame the best outlet tension force setting value T
_{iy}, 15# frame reduction ratio setting value ε
_{i0}, 14# rack outlet tension force setting value T
_{i0}, 15# frame draught pressure P
_{i}, 15# frame rolling power F
_{i}, 15# frame slip factor ψ
_{i}, 15# frame relative power surplus w
_{i}, 15# machine frame rolling mill work roll bending power S
_{iw}, last frame band steel exit plate shape value shape;
C (), in order to improve the regulating power of unit to exit plate shape to greatest extent, makes the ith machine frame rolling mill work roll bending power
${S}_{\mathrm{iw}}=\frac{{S}_{\mathrm{iw}\mathrm{max}}^{+}{S}_{\mathrm{iw}\mathrm{max}}^{}}{2};$
(d) given 14# frame reduction ratio ε
_{i0}with 14# rack outlet tension force T
_{i0}initial value;
E () calculates the 5th frame reduction ratio initial value
${\mathrm{\ϵ}}_{50}=1\frac{{h}_{5}}{{h}_{0}(1{\mathrm{\ϵ}}_{10})(1{\mathrm{\ϵ}}_{20})(1{\mathrm{\ϵ}}_{30})(1{\mathrm{\ϵ}}_{40})};$
F () calculates current working under, the draught pressure P of each frame
_{i}, rolling power F
_{i}, slip factor ψ
_{i}, last frame band steel exit plate shape value shape;
G () judges inequality
$\left\{\begin{array}{c}{F}_{i}<\mathrm{\ξ}{F}_{\mathrm{max}i}\\ {P}_{i}<\mathrm{\ξ}{P}_{\mathrm{max}i}\\ {\mathrm{\ψ}}_{i}<\mathrm{\ξ}{\mathrm{\ψ}}^{*}\\ \mathrm{max}\left({w}_{i}\right)\mathrm{min}\left({w}_{i}\right)<{w}_{\mathrm{max}}^{*}\\ \mathrm{shape}<\mathrm{\ξ}{\mathrm{shape}}^{*}\end{array}\right.$ Whether set up simultaneously, if inequality is set up, then proceed to step (h); If inequality is false, then redistributes the initial value of reduction ratio and outlet tension force, proceed to step (j);
H () calculates current working under, each frame plucking comprehensive descision index λ
_{i}value;
I () calculates the optimization object function under current rolling schedule
a is weight coefficient, A=0.350.65, wherein
represent the uniformity of each frame revised plucking comprehensive descision index,
represent the overall numerical value of each frame revised plucking comprehensive descision index;
J () judges whether Powell condition is set up, namely judge that whether objective function F is minimum, if Powell condition is set up, then makes ε
_{iy}=ε
_{i0}, T
_{iy}=T
_{i0}, proceed to step (k), otherwise adjustment ε
_{i0}, T
_{i0}, proceed to step (e);
K () exports optimum rolling procedure ε
_{iy}, T
_{iy}, complete the rolling schedule optimization setting of five Stands Cold Tandem Mill group preventing ink tailings.
2. a kind of tandem mills according to claim 1 rolling procedure comprehensive optimization method that is target with plucking control, it is characterized in that: in described step (h), the computation model of plucking comprehensive descision index is:
λ in formulaplucking comprehensive descision index;
ψslip factor;
μcoefficient of friction;
Vband steel exports speed;
Δ hdrafts;
R 'working roll flattens radius;
T
_{in}entrance tension force;
T
_{out}outlet tension force;
Pdraught pressure;
α, γrate coefficient, closely related with the characteristic of cold continuous rolling, α=0.81.2, γ=0.40.6;
actual iron powder content inemulsion;
there is the emulsion iron content critical value of galling defect;
In βemulsion, iron powder is to the Intrusion Index of plucking probability of happening, β=0.70.8;
σ
_{s}the average deformation drag offrame inlet/outlet band;
ηstrength of materials to the influence coefficient of plucking probability of happening, η=0.350.45.
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