CN103544340A - Method for setting concentration of emulsion in rolling of five-rack cold continuous rolling unit extremely thin band - Google Patents

Abstract

The invention discloses a method for setting concentration of emulsion in rolling of a five-rack cold continuous rolling unit extremely thin band. The method includes the following steps: (1) collecting characteristic parameters of main devices of a unit and to-be-rolled bands, main rolling process parameters and process lubricating system parameters, (2) defining related process parameters, (3) computing roll bending force and the roll channeling amount, (4) assigning related search process parameters, (6) computing concentration process parameters, (6) computing the search process speed of the highest rolling speed, (7) computing friction coefficients of various racks under the current condition, (8) computing rolling force, rolling power, slip factors, heat slip damage indexes and vibration coefficients of the various racks under the current condition, (9) computing heat convexity degrees of working rollers of the various racks, (10) computing an exit plate shape and the pressing width, and (11) obtaining and outputting the optimum proportion concentration. The steps are executed by a computer. According to the method, the rolling speed can be quickened, the rolling efficiency can be guaranteed, slip, heat slip damage and vibration are avoided, and it is guaranteed that the exit plate shape of the final rack and the pressing width of the roller ends of the working rollers are the smallest.

Description

The establishing method of concentration of emulsion used in five Stands Cold Tandem Mill group strip in razor-thin rollings

Technical field

The present invention relates to metallurgical cold rolling field, be particularly suitable for the establishing method of concentration of emulsion used in a kind of five Stands Cold Tandem Mill group strip in razor-thin rollings.

Background technology

Along with market competition aggravation, user is constantly strong to the demand of belt steel thickness attenuate, requires producer that the even thinner product of 0.17mm is provided.But according to on-the-spot practical experience, along with reducing of belt steel thickness, very easily produce in process of production vibration, skid and the related defects such as hot sliding injury, especially particularly evident on the impact of rolling mill vibration, rolling mill vibration again can strip surface be formed with perpendicular to roll to the striped that replaces of light and shade or cause exit thickness deviation excessive, affect the quality of product.In the situation that other factors cannot change, scene can only alleviate the vibration of milling train by reduction of speed, make production restoration normal, so great production efficiency that affects unit.By research, find, rolling mill vibration except with mill speed mutually outside the Pass, also closely related with the Frotteurism of roll gap, on the one hand, the lubricating oil film in roll gap plays a kind of damping action for the Vertical Vibrating kinetic energy of rolling machine system, and the friction factor of oil film is lower, its damping action is poorer, the stability of system is also just poorer, and under kindred circumstances, the probability that vibration occurs milling train is also larger; On the other hand, in roll gap, friction factor is less, and friction is just less on the impact of draught pressure, relative tension force is just lower on the impact of draught pressure, cause the self-excitation relation of entrance tension force and draught pressure to strengthen, system stability reduces, and milling train more easily vibrates.In addition,, if roll gap lubrication is too abundant, under labile factor is disturbed, the state fluctuation of roll gap can be larger, also the stability of system produced to adverse influence, increases the probability (document [1]) that rolling mill vibration occurs.And the concentration of friction factor in roll gap and lubricating status and emulsion is closely related, along with the increase of concentration, oil film thickness can increase, and friction factor can reduce, and is unfavorable for like this rolling mill vibration and the control of skidding, but is conducive to the control of hot sliding injury defect; When the concentration of emulsion surpasses certain value, it is more remarkable that the coefficient of heat transfer of emulsion declines, contact region temperature-rise ratio is very fast, thereby the kinetic viscosity that causes lubricating oil reduce also than comparatively fast, oil film thickness can reduce, friction factor can increase, and is conducive to like this rolling mill vibration and the control of skidding, but is unfavorable for the control of hot sliding injury.In addition, the concentration change of emulsion can also affect heat transfer coefficient, changes the hot-rolling type of each frame working roll, and what cause milling train exit plate shape and working roll presses width change (document [2,3]).The variation of concentration of emulsion used can be skidded in influence of rolled process in other words, the probability of happening of the defect such as hot sliding injury, vibration and last frame exit plate shape and working roll press width, thus final influence of rolled speed.If it is unreasonable that the concentration of emulsion is set, will likely make unit mill speed not increase, influence of rolled efficiency.In the past, the on-the-spot setting for concentration of emulsion used relied on operative employee's experience to complete substantially, the band steel to all specifications, all adopt same concentration, cause in the paper-thin strip operation of rolling, mill speed is on the low side or strip surface quality is not good, to unit, brings larger economic loss.

(list of references: [1] Zou Jiaxiang, Xu Lejiang. cold continuous rolling system vibration is controlled [M]. metallurgical industry publishing house, 2006.[2] Bai Zhenhua. cold continuous rolling high-speed production process core mathematics model [M]. China Machine Press, 2009.[3] Lian Jiachuan, Liu Hongmin. gauge and shape is controlled [M]. weapon industry publishing house, 1995.)

Summary of the invention

The object of the present invention is to provide a kind ofly can improve mill speed, guarantee rolling efficiency, avoid skidding, the establishing method of concentration of emulsion used in five Stands Cold Tandem Mill group paper-thin strip rollings that the defect such as hot sliding injury and vibration occurs.

Technical scheme of the present invention is as follows:

An establishing method for concentration of emulsion used in five Stands Cold Tandem Mill group paper-thin strip rollings, comprises the following step of being carried out by computing machine:

(a) collect major equipment and the technological parameter of five Stands Cold Tandem Mill groups, mainly comprise 1-5# machine frame rolling mill maximum draught pressure setting value P allowable _imaxi=1,2 ... 5,1-5# machine frame rolling mill maximum rolling power setting value F allowable _imax, 1-5# frame intermediate calender rolls maximum shifting amount δ allowable _imax, the maximum positive bending roller force of 1-5# frame working roll

the maximum negative bending roller force of 1-5# frame working roll

the maximum positive bending roller force of 1-5# frame intermediate calender rolls

the maximum negative bending roller force of 1-5# frame intermediate calender rolls

the maximum that end frame allows presses length end frame outlet allows maximum plate shape value

1-5# working roll roller footpath D _iw, 1-5# frame intermediate calender rolls diameter D _im, 1-5# frame support roller diameter D _ib, 1-5# frame working roller Distribution Value Δ D _wij, 1-5# frame intermediate calender rolls roll shape Distribution Value Δ D _mij, 1-5# frame support roller roll shape Distribution Value Δ D _bij, 1-5# frame working roll barrel length L _wi, 1-5# frame intermediate calender rolls barrel length L _mi, 1-5# frame support roller barrel length L _bi, 1-5# frame working roll bending cylinder centre distance l _wi, 1-5# frame intermediate calender rolls roll-bending cylinder centre distance l _mi, 1-5# frame support roller housing screw centre distance l _bi;

(b) collect the characteristic parameter for the treatment of rolled strip, mainly comprise: the width B of band; The thickness h of band supplied materials ₀; The exit thickness h of 1-5 machine frame rolling mill band steel _i; The elastic modulus E of band; The Poisson ratio v of band; The initial deformation drag σ of band _s0; Resistance of deformation coefficient of intensification k _s;

(c) collect main rolling technological parameter, mainly comprise critical slip factor value ψ *; Critical slip injury index threshold vibration coefficient φ ^*; Safety coefficient η; Uncoiler uncoiling tension T ₀, the outlet tension force T of 1-5# machine frame rolling mill band steel _i;

(d) collect main technique lubricating regime parameter, mainly comprise the flow W of 1-5# frame emulsion _i; The temperature T of emulsion _c; Emulsion system license Cmin C _min, emulsion system license Cmax C _max;

(e) maximum mill speed search procedure parameter m in definition concentration of emulsion used Optimal Setting process; The search procedure speed V of maximum mill speed _max0; Concentration of emulsion used search procedure parameter j; Concentration of emulsion used search procedure variable C ₁, C ₂; Best matched proportion density C _y; Concentration step-size in search Δ C; 1-5# frame coefficientoffrictionμ _i, draught pressure F _i, rolling power P _i, slip factor ψ _i, slip injury index

oscillating Coefficients φ _i; Tandem mills i rolling mill work roll bending power S _iw, intermediate calender rolls bending roller force S _im; 1-5# frame intermediate calender rolls shifting amount δ _i; Work roll thermal crown value Δ TD _iw; End breast roll side pressure is by amount L _y, last frame exit plate shape value σ _y;

(f) in order to improve to greatest extent the regulating power of unit to exit plate shape, make i machine frame rolling mill work roll bending power

1-5# frame intermediate calender rolls bending roller force

1-5 frame intermediate calender rolls shifting amount is set to ground state δ _i=0;

(g) in definition paper-thin strip cold-rolled process, the initial value of maximum mill speed is V _0max, and make V _0max=100m/min, concentration search procedure parameter j=0, step-size in search Δ C=0.001%;

(h) calculating concentration procedure parameter C ₁=C _min+ j Δ C;

(i) make maximum mill speed search procedure parameter m=0;

(j) calculate the search procedure speed V of maximum mill speed _max0=V _0max+ 0.5m;

(k) calculate current technological lubrication system and mill speed V _max0the coefficientoffrictionμ of lower each frame _i, wherein the computation model of friction factor is:

in formula, μ is friction factor, and a is fluid friction influence coefficient, and b is dry friction influence coefficient, B _ξfor friction factor damped expoential, ξ ₀for the oil film thickness under current working, a, b, B _ξvalue relevant with unit equipment;

(l) with the coefficientoffrictionμ under current working _i, each interstand tension setting value T _i, each frame exit thickness h _i, band initial deformation drag σ _s0, resistance of deformation coefficient of intensification k _sfor starting condition, calculate current technological lubrication system and mill speed V _max0the draught pressure P of lower 1-5# frame _i, rolling power F _i, slip factor ψ _i, slip injury index oscillating Coefficients φ _i; Wherein Rolling Pressure Calculation basic model is: $P=({\mathrm{\&sigma;}}_s-q_m)B\sqrt{R^{\text{'}}{\mathrm{<figure-callout\; id="0"\; label="H"\; filenames="HDA0000387925320000011.png,HDA0000387925320000021.png"\; state="\{\{state\}\}">H</figure-callout>}}_0\mathrm{\&epsiv;}}(1.08+1.79\mathrm{\&mu;\&epsiv;}\sqrt{\frac{R^{\text{'}}}{H_0(1-\mathrm{\&epsiv;})}}-1.02\mathrm{\&epsiv;}),$ Rolling power calculates basic model:

the basic model of slip factor is:

the basic model of slip injury index is:

oscillating Coefficients basic model is:

wherein P is roll-force, and R ' is for flattening radius, q _mfor equivalent tension force, σ _sfor average deformation drag, B is strip width, and μ is friction factor, and ε is reduction ratio, H ₀for inlet thickness; F _ffor rolling power, η is electric efficiency, v _rfor roll rotational speed (m/min), R is roller radius (m), and N is roll torque; ψ is slip factor, T ₁, T ₀for front and back tension force, Δ h is drafts;

for slip injury index, ξ is contact in rolling lubricating oil film equivalent depth, the lubricating oil film equivalent depth of ξ ' critical heat sliding injury state; φ is Oscillating Coefficients, and E is elastic modulus, and v is rolled piece velocity of discharge, T _cfor mean tension, L is adjacent frame spacing, and ω is system frequency;

(m) judgement inequality

whether set up simultaneously? if inequality is set up, proceed to step (n), otherwise proceed to step (r);

(n) calculate under current tension schedule, reduction system, technological lubrication system the hot convexity Δ TD of each frame working roll _iw;

(o) calculate under current tension schedule, reduction system, technological lubrication system the exit plate shape of last frame value σ _ypress segment length L with last frame _y;

(p) judgement inequality set up? if inequality is set up, proceed to step (q); If inequality is false, proceed to step (r);

(q) make m=m+1, proceed to step (j);

(r) judgement inequality

set up? if inequality is set up, V _0max=V _max0-0.5, C ₂=C ₁, proceed to step (s); If inequality is false, directly proceed to step (s);

(s) judgement inequality

set up? as inequality, set up, make j=j+1, proceed to step (h); If inequality is false, proceed to step (t);

(t) obtain optimum emulsification liquid matched proportion density C _y=C ₂, and maximum mill speed V _max0, complete the concentration of emulsion used integrated optimization and setting in five Stands Cold Tandem Mill group paper-thin strip rollings.

The present invention compared with prior art tool has the following advantages:

(1) farthest improve mill speed, guarantee rolling efficiency;

(2) farthest avoid skidding, the generation of the defect such as hot sliding injury and vibration;

(3) guarantee that last frame exit plate shape minimum and working roll roller end press width minimum.

Adopt concentration of emulsion used optimized calculation method in the paper-thin strip operation of rolling of the present invention, different size adopted to its corresponding optimum emulsification liquid concentration with steel, with domestic certain cold rolling mill cooperation, through on-the-spot, use, the present invention reduced rolling mill vibration in the on-the-spot strip in razor-thin operation of rolling, skid and probability that hot sliding injury defect occurs, compare mill speed with classic method and improved 9.23-14.39%, brought very large economic benefit, there is the value of further applying.

Accompanying drawing explanation

Fig. 1 is the total calculation flow chart of the present invention;

Fig. 2 is each machine frame rolling mill working roller curve figure in the embodiment of the present invention 1;

Fig. 3 is last frame exit plate shape correlation curve figure before and after optimizing in the embodiment of the present invention 1;

Each machine frame rolling mill working roller curve figure in Fig. 4 embodiment of the present invention 2;

Fig. 5 is last frame exit plate shape correlation curve figure before and after optimizing in the embodiment of the present invention 2.

Embodiment

Embodiment 1

In five Stands Cold Tandem Mill group paper-thin strip rollings shown in Fig. 1 in total calculation flow chart of the establishing method of concentration of emulsion used, first, in step 1, collect major equipment and the technological parameter of five Stands Cold Tandem Mill groups, 1-5 machine frame rolling mill maximum draught pressure setting value P allowable _imax=(1800t, 1800t, 1800t, 1800t, 1800t) i=1,2 ... 5,1-5 machine frame rolling mill maximum rolling power setting value F allowable _imax=(2680kw, 4000kw, 4000kw, 4000kw, 4000kw), 1-5# frame intermediate calender rolls maximum shifting amount δ allowable _imax=80mm, the maximum positive bending roller force of 1-5# frame working roll

the maximum negative bending roller force of 1-5# frame working roll the maximum positive bending roller force of 1-5# frame intermediate calender rolls

the maximum negative bending roller force of 1-5# frame intermediate calender rolls

the maximum that end frame allows presses length

end frame outlet allows maximum plate shape value

1-5# working roll roller footpath D _iw={ 482.89,486.32,459.24,386.21,394.5}mm, 1-5# frame intermediate calender rolls diameter D _im={ 510.68,527.35,508.56,526.29,537.34}mm, 1-5# frame support roller diameter D _ib={ 1231.99,1179.48,1176.12,1241.3,1241.3}mm, 1-5# frame working roller Distribution Value Δ D _wij=0,1-5# frame support roller roll shape Distribution Value Δ D _bij=0,1-5# frame intermediate calender rolls roll shape Distribution Value Δ D _mij={ 78.181 ,-23.081,18.626,48.241,67.067,76.403,77.552,71.815,60.494,44.889,26.302,6.035,-14.612 ,-34.336 ,-51.837 ,-65.813,-74.963 ,-77.985 ,-73.578 ,-60.441,-37.272 ,-2.769, the μ m of 44.367}(unit), 1-5# frame working roll barrel length L _wi=1350mm, 1-5# frame intermediate calender rolls barrel length L _mi=1510mm, 1-5# frame support roller barrel length L _bi=1350mm, 1-5# frame working roll bending cylinder centre distance l _wi=2500mm, 1-5# frame intermediate calender rolls roll-bending cylinder centre distance l _mi=2500mm, 1-5# frame support roller housing screw centre distance l _bi=2500mm;

Subsequently, in step 2, collect the characteristic parameter for the treatment of rolled strip, mainly comprise: the width B=812mm of band; The thickness h of band supplied materials ₀=2.01mm; The exit thickness h of 1-5 machine frame rolling mill band steel _i={ 1.186,0.68,0.472,0.271,0.182}mm; Elastic modulus E=2.1 * the 105MPa of band; The Poisson ratio v=0.3 of band; The initial deformation drag σ of band _s0=350MPa; Resistance of deformation coefficient of intensification k _s=1.3;

Subsequently, in step 3, collect main rolling technological parameter, mainly comprise critical slip factor ψ ^*=0.4, critical heat slip injury index

threshold vibration coefficient φ ^*=0.9, safety coefficient η=0.9; Uncoiler uncoiling tension T ₀=65MPa, the outlet tension force T of 1-5 machine frame rolling mill band steel _i={ 110,125,132,125,68}MPa;

Subsequently, in step 4, collect main technique lubricating regime parameter, mainly comprise the flow W of 1-5 frame emulsion _i={ 1010,1250,1100,950,1200}L/min; The temperature T of emulsion _c=58 ℃; Emulsion system license Cmin C _min=1%, emulsion system license Cmax C _max=6%;

Subsequently, in step 5, maximum mill speed search procedure parameter m in definition concentration of emulsion used Optimal Setting process; The search procedure speed V of maximum mill speed _max0; Concentration of emulsion used search procedure parameter j; Concentration of emulsion used search procedure variable C ₁, C ₂; Best matched proportion density C _y; Concentration step-size in search Δ C; 1-5 frame coefficientoffrictionμ _i, draught pressure F _i, rolling power P _i, slip factor ψ _i, slip injury index oscillating Coefficients φ _i; Tandem mills i rolling mill work roll bending power S _iw, intermediate calender rolls bending roller force S _im; 1-5 frame intermediate calender rolls shifting amount δ _i; Work roll thermal crown value Δ TD _iw; End breast roll side pressure is by amount L _y, last frame exit plate shape value σ _y;

Subsequently, in step 6, make i machine frame rolling mill work roll bending power

i frame intermediate calender rolls bending roller force

1-5 frame intermediate calender rolls shifting amount is set to ground state δ _i=0;

Subsequently, in step 7, in definition paper-thin strip cold-rolled process, the initial value of maximum mill speed is V _0max, and make V _0max=100m/min, concentration search procedure parameter i=0, step-size in search Δ C=0.01%;

Subsequently, in step 8, calculate concentration of emulsion used procedure parameter C ₁=C _min+ j Δ C=1%;

Subsequently, in step 9, make maximum mill speed search procedure parameter m=0;

Subsequently, in step 10, calculate the search procedure speed V of maximum mill speed _max0=V _0max+ 0.5m=100m/min;

Subsequently, in step 11, calculate current technological lubrication system and mill speed V _max0the coefficientoffrictionμ of lower each frame _i={ 0.0870,0.0635,0.0470,0.0413,0.0329};

Subsequently, in step 12, with the coefficientoffrictionμ under current working _i, each interstand tension setting value T _i, each frame exit thickness h _i, band initial deformation drag σ _s0, resistance of deformation coefficient of intensification k _sfor starting condition, calculate current technological lubrication system and mill speed V _max0the draught pressure P of lower 1-5# frame _i={ 681.64,713.21,533.82,586.14,633.78}t, rolling power F _i={ 94.58,142.81,123.99,186.98,163.18}Kw, slip factor ψ _i={ 0.153,0.152,0.123,0.145,0.093}, slip injury index

, Oscillating Coefficients φ _i={ 0.033,0.105,0.176,0.215,0.308};

Subsequently, in step 13, judgement inequality

whether set up simultaneously? obviously inequality is set up, and proceeds to step 14;

Subsequently, in step 14, calculate under current tension schedule, reduction system, technological lubrication system the hot convexity Δ TD of each frame working roll _iw, the work roll thermal crown of each frame as shown in Figure 2;

Subsequently, in step 15, calculate under current tension schedule, reduction system, technological lubrication system the exit plate shape of last frame value σ _y=16I and last frame press segment length L _y=48.6mm, plate shape curve is as shown in Figure 3;

Subsequently, in step 16, judgement inequality

set up? obviously inequality is set up, and proceeds to step 17;

Subsequently, in step 17, make m=m+1=1, proceed to step 10;

Subsequently, in step 18, judgement inequality

set up? if inequality is set up, V _0max=V _max0-0.5, C ₂=C ₁, proceed to step 19; If inequality is false, directly proceed to step 19;

Subsequently, in step 19, judgement inequality

set up? as inequality, set up, make j=j+1, proceed to step 8; If inequality is false, proceed to step 20;

Finally, in step 20, obtain optimum emulsification liquid matched proportion density C _y=C ₂=4.65%, maximum mill speed V _max0=1420m/min, completes the concentration of emulsion used integrated optimization and setting in five Stands Cold Tandem Mill group paper-thin strip rollings.

Finally, for convenient relatively, as shown in table 1, provide respectively the concentration of emulsion used and the maximum mill speed that adopt in the paper-thin strip operation of rolling that the method for the invention and classic method draw.As can be seen from Table 1, after concentration of emulsion used improves, unit has been brought up to 1420m/min to the maximum mill speed of this thin specification band from 1300m/min, has improved 9.23%, has improved well the production efficiency of unit.

In table 1: embodiment 1, adopt the present invention and classic method parameter comparison

?	Concentration of emulsion used	Maximum mill speed
			The present invention	4.65%	1420m/min
Classic method	4.2%	1300m/min

Embodiment 2

First, in step 1, collect major equipment and the technological parameter of five Stands Cold Tandem Mill groups, 1-5 machine frame rolling mill maximum draught pressure setting value P allowable _imax=(1800t, 1800t, 1800t, 1800t, 1800t) i=1,2 ... 5,1-5 machine frame rolling mill maximum rolling power setting value F allowable _imax=(2680kw, 4000kw, 4000kw, 4000kw, 4000kw), 1-5# frame intermediate calender rolls maximum shifting amount δ allowable _imax=80mm, the maximum positive bending roller force of 1-5# frame working roll

the maximum negative bending roller force of 1-5# frame working roll

the maximum positive bending roller force of 1-5# frame intermediate calender rolls

the maximum negative bending roller force of 1-5# frame intermediate calender rolls the maximum that end frame allows presses length

end frame outlet allows maximum plate shape value 1-5# working roll roller footpath D _iw={ 476.84,480.86,463.06,399.33,406.86}mm, 4-5# frame intermediate calender rolls diameter D _im={ 533.26,529.82,513.45,510.46,508.92}mm, 1-5# frame support roller diameter D _ib={ 1241.43,1179.48,1176.12,1241.3,1241.3}mm, 1-5# frame working roller Distribution Value Δ D _wij=0,1-5# frame support roller roll shape Distribution Value Δ D _bij=0,4-5# frame intermediate calender rolls roll shape Distribution Value Δ D _mij={ 78.181 ,-23.081,18.626,48.241,67.067,76.403,77.552,71.815,60.494,44.889,26.302,6.035,-14.612 ,-34.336 ,-51.837 ,-65.813,-74.963 ,-77.985 ,-73.578 ,-60.441,-37.272 ,-2.769, the μ m of 44.367}(unit), 1-5# frame working roll barrel length L _wi=1350mm, 1-5# frame intermediate calender rolls barrel length L _mi=1510mm, 1-5# frame support roller barrel length L _bi=1350mm, 1-5# frame working roll bending cylinder centre distance l _wi=2500mm, 1-5# frame intermediate calender rolls roll-bending cylinder centre distance l _mi=2500mm, 1-5# frame support roller housing screw centre distance l _bi=2500mm;

Subsequently, in step 2, collect the characteristic parameter for the treatment of rolled strip, mainly comprise: the width B=966mm of band; The thickness h of band supplied materials ₀=2.02mm; The exit thickness h of 1-5 machine frame rolling mill band steel _i={ 1.15515,0.642261,0.396439,0.259047,0.181}mm; Elastic modulus E=2.1 * 10 of band ⁵mPa; The Poisson ratio v=0.3 of band; The initial deformation drag σ of band _s0=400MPa; Resistance of deformation coefficient of intensification k _s=1.3;

Subsequently, in step 3, collect main rolling technological parameter, mainly comprise critical slip factor ψ ^*=0.36, critical heat slip injury index

threshold vibration coefficient φ ^*=0.85, safety coefficient η=0.9; Uncoiler uncoiling tension T ₀=70MPa, the outlet tension force T of 1-5 machine frame rolling mill band steel _i={ 130,145,145,150,65}MPa;

Subsequently, in step 4, collect main technique lubricating regime parameter, mainly comprise the flow W of 1-5 frame emulsion _i={ 1010,1250,1100,950,1200}L/min; The temperature T of emulsion _c=58 ℃; Emulsion system license Cmin C _min=1%, emulsion system license Cmax C _max=6%;

Subsequently, in step 5, maximum mill speed search procedure parameter m in definition concentration of emulsion used Optimal Setting process; The search procedure speed V of maximum mill speed _max0; Concentration of emulsion used search procedure parameter j; Concentration of emulsion used search procedure variable C ₁, C ₂; Best matched proportion density C _y; Concentration step-size in search Δ C; 1-5 frame coefficientoffrictionμ _i, draught pressure F _i, rolling power P _i, slip factor ψ _i, slip injury index

oscillating Coefficients φ _i; Tandem mills i rolling mill work roll bending power S _iw, intermediate calender rolls bending roller force S _im; 1-5 frame intermediate calender rolls shifting amount δ _i; Work roll thermal crown value Δ TD _iw; End breast roll side pressure is by amount L _y, last frame exit plate shape value σ _y;

Subsequently, in step 6, make i machine frame rolling mill work roll bending power

i frame intermediate calender rolls bending roller force

1-5 frame intermediate calender rolls shifting amount is set to ground state δ _i=0;

Subsequently, in step 7, in definition paper-thin strip cold-rolled process, the initial value of maximum mill speed is V _0max, and make V _0max=100m/min, concentration search procedure parameter i=0, step-size in search Δ C=0.01%;

Subsequently, in step 8, calculate concentration of emulsion used procedure parameter C ₁=C _min+ j Δ C=1%;

Subsequently, in step 9, make maximum mill speed search procedure parameter m=0;

Subsequently, in step 10, calculate the search procedure speed V of maximum mill speed _max0=V _0max+ 0.5m=100m/min;

Subsequently, in step 11, calculate current technological lubrication system and mill speed V _max0the coefficientoffrictionμ of lower each frame _i={ 0.0789,0.0585,0.0602,0.0428,0.0317};

Subsequently, in step 12, with the coefficientoffrictionμ under current working _i, each interstand tension setting value T _i, each frame exit thickness h _i, band initial deformation drag σ _s0, resistance of deformation coefficient of intensification k _sfor starting condition, calculate current technological lubrication system and mill speed V _max0the draught pressure P of lower 1-5# frame _i={ 893.56,909.49,1010.58,721.57,813.37}t, rolling power F _i={ 127.06,196.83,209.62,175.98,197.59}Kw, slip factor ψ _i={ 0.172,0.165,0.097,0.105,0.085}, slip injury index

, Oscillating Coefficients φ _i={ 0.028,0.092,0.156,0.227,0.290};

Subsequently, in step 13, judgement inequality whether set up simultaneously? obviously inequality is set up, and proceeds to step 14;

Subsequently, in step 14, calculate under current tension schedule, reduction system, technological lubrication system the hot convexity Δ TD of each frame working roll _iw, the work roll thermal crown of each frame as shown in Figure 4;

Subsequently, in step 15, calculate under current tension schedule, reduction system, technological lubrication system the exit plate shape of last frame value σ _y=16I and last frame press segment length L _y=48.6mm, plate shape curve is as shown in Figure 5;

Subsequently, in step 16, judgement inequality

set up? obviously inequality is set up, and proceeds to step 17;

Subsequently, in step 17, make m=m+1=1, proceed to step 10;

Subsequently, in step 18, judgement inequality

set up? if inequality is set up, V _0max=V _max0-0.5, C ₂=C ₁, proceed to step 19; If inequality is false, directly proceed to step 19;

Subsequently, in step 19, judgement inequality

set up? as inequality, set up, make j=j+1, proceed to step 8; If inequality is false, proceed to step 20;

Finally, in step 20, obtain optimum emulsification liquid matched proportion density C _y=C ₂=4.78%, maximum mill speed V _max0=1510m/min, completes the concentration of emulsion used integrated optimization and setting in five Stands Cold Tandem Mill group paper-thin strip rollings.

Finally, for convenient relatively, as shown in table 2, provide respectively the concentration of emulsion used and the maximum mill speed that adopt in the paper-thin strip operation of rolling that the method for the invention and classic method draw.As can be seen from Table 2, after concentration of emulsion used improves, unit has been brought up to 1510m/min to the maximum mill speed of this thin specification band from 1320m/min, has improved 14.39%, has well improved the production efficiency of unit.

In table 2: embodiment 2, adopt the present invention and classic method parameter comparison

?	Concentration of emulsion used	Maximum mill speed
			The present invention	4.78%	1510m/min
Classic method	4.2%	1320m/min

Claims (1)

1. an establishing method for concentration of emulsion used in five Stands Cold Tandem Mill group paper-thin strip rollings, it comprises the following step of being carried out by computing machine:

(a) collect major equipment and the technological parameter of five Stands Cold Tandem Mill groups, mainly comprise 1-5# machine frame rolling mill maximum draught pressure setting value P allowable _imaxi=1,2 ... 5,1-5# machine frame rolling mill maximum rolling power setting value F allowable _imax, 1-5# frame intermediate calender rolls maximum shifting amount δ allowable _imax, the maximum positive bending roller force of 1-5# frame working roll the maximum negative bending roller force of 1-5# frame working roll

the maximum positive bending roller force of 1-5# frame intermediate calender rolls

the maximum negative bending roller force of 1-5# frame intermediate calender rolls

the maximum that end frame allows presses length

end frame outlet allows maximum plate shape value

1-5# working roll roller footpath D _iw, 1-5# frame intermediate calender rolls diameter D _im, 1-5# frame support roller diameter D _ib, 1-5# frame working roller Distribution Value Δ D _wi _j, 1-5# frame intermediate calender rolls roll shape Distribution Value Δ D _mi _j, 1-5# frame support roller roll shape Distribution Value Δ D _bi _j, 1-5# frame working roll barrel length L _wi, 1-5# frame intermediate calender rolls barrel length L _mi, 1-5# frame support roller barrel length L _bi, 1-5# frame working roll bending cylinder centre distance l _wi, 1-5# frame intermediate calender rolls roll-bending cylinder centre distance l _mi, 1-5# frame support roller housing screw centre distance l _bi;

(b) collect the characteristic parameter for the treatment of rolled strip, mainly comprise: the width B of band; The thickness h of band supplied materials ₀; The exit thickness h of 1-5# machine frame rolling mill band steel _i; The elastic modulus E of band; The Poisson ratio v of band; The initial deformation drag σ of band _s0; Resistance of deformation coefficient of intensification k _s;

(c) collect main rolling technological parameter, mainly comprise critical slip factor value ψ *; Critical slip injury index

threshold vibration coefficient φ ^*; Safety coefficient η; Uncoiler uncoiling tension T ₀, the outlet tension force T of 1-5# machine frame rolling mill band steel _i;

(d) collect main technique lubricating regime parameter, mainly comprise the flow W of 1-5# frame emulsion _i; The temperature T of emulsion _c; Emulsion system license Cmin C _min, emulsion system license Cmax C _max;

(e) maximum mill speed search procedure parameter m in definition concentration of emulsion used Optimal Setting process; The search procedure speed V of maximum mill speed _max0; Concentration of emulsion used search procedure parameter j; Concentration of emulsion used search procedure variable C ₁, C ₂; Best matched proportion density C _y; Concentration step-size in search Δ C; 1-5# frame coefficientoffrictionμ _i, draught pressure F _i, rolling power P _i, slip factor ψ _i, slip injury index

, Oscillating Coefficients φ _i; Tandem mills i rolling mill work roll bending power S _iw, intermediate calender rolls bending roller force S _im; 1-5# frame intermediate calender rolls shifting amount δ _i; Work roll thermal crown value Δ TD _iw; End breast roll side pressure is by amount L _y, last frame exit plate shape value σ _y;

(f) in order to improve to greatest extent the regulating power of unit to exit plate shape, make i machine frame rolling mill work roll bending power

1-5# frame intermediate calender rolls bending roller force

1-5# frame intermediate calender rolls shifting amount is set to ground state δ _i=0;

(g) in definition paper-thin strip cold-rolled process, the initial value of maximum mill speed is V _0max, and make V _0max=100m/min, concentration search procedure parameter j=0, step-size in search Δ C=0.001%;

(h) calculating concentration procedure parameter C ₁=C _min+ j Δ C;

(i) make maximum mill speed search procedure parameter m=0;

(j) calculate the search procedure speed V of maximum mill speed _max0=V _0max+ 0.5m;

(k) calculate current technological lubrication system and mill speed V _max0the coefficientoffrictionμ of lower each frame _i, wherein the computation model of friction factor is:

in formula, μ is friction factor, and a is fluid friction influence coefficient, and b is dry friction influence coefficient, B _ξfor friction factor damped expoential, ξ ₀for the oil film thickness under current working, a, b, B _ξvalue relevant with unit equipment;

(l) with the coefficientoffrictionμ under current working _i, each interstand tension setting value T _i, each frame exit thickness h _i, band initial deformation drag σ _s0, resistance of deformation coefficient of intensification k _sfor starting condition, calculate current technological lubrication system and mill speed V _max0the draught pressure P of lower 1-5# frame _i, rolling power F _i, slip factor ψ _i, slip injury index

oscillating Coefficients φ _i; Wherein Rolling Pressure Calculation basic model is: $P=({\mathrm{\&sigma;}}_s-q_m)B\sqrt{R^{\text{'}}{H}_0\mathrm{\&epsiv;}}(1.08+1.79\mathrm{\&mu;\&epsiv;}\sqrt{\frac{R^{\text{'}}}{H_0(1-\mathrm{\&epsiv;})}}-1.02\mathrm{\&epsiv;}),$ Rolling power calculates basic model:

the basic model of slip factor is:

the basic model of slip injury index is:

oscillating Coefficients basic model is:

wherein P is roll-force, and R ' is for flattening radius, q _mfor equivalent tension force, σ _sfor average deformation drag, B is strip width, and μ is friction factor, and ε is reduction ratio, H ₀for inlet thickness; F _ffor rolling power, η is electric efficiency, v _rfor roll rotational speed (m/min), R is roller radius (m), and N is roll torque, and ψ is slip factor, T ₁, T ₀for front and back tension force, Δ h is drafts;

for slip injury index, ξ is contact in rolling lubricating oil film equivalent depth, the lubricating oil film equivalent depth of ξ ' critical heat sliding injury state; φ is Oscillating Coefficients, and E is elastic modulus, and v is rolled piece velocity of discharge, T _cfor mean tension, L is adjacent frame spacing, and ω is system frequency;

(m) judgement inequality

whether set up simultaneously? if inequality is set up, proceed to step (n), otherwise proceed to step (r);

(n) calculate under current tension schedule, reduction system, technological lubrication system the hot convexity Δ TD of each frame working roll _iw;

(o) calculate under current tension schedule, reduction system, technological lubrication system the exit plate shape of last frame value σ _ypress segment length L with last frame _y;

(p) judgement inequality

set up? if inequality is set up, proceed to step (q); If inequality is false, proceed to step (r);

(q) make m=m+1, proceed to step (j);

(r) judgement inequality

set up? if inequality is set up, V _0max=V _max0-0.5, C ₂=C ₁, proceed to step (s); If inequality is false, directly proceed to step (s);

(s) judgement inequality

set up? as inequality, set up, make j=j+1, proceed to step (h); If inequality is false, proceed to step (t);

(t) obtain optimum emulsification liquid matched proportion density C _y=C ₂, and maximum mill speed V _max0, complete the integrated optimization and setting of concentration of emulsion used in five Stands Cold Tandem Mill group paper-thin strip rollings.

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