CN104289531A - Emulsified liquid temperature optimization setting method of five-rack cold continuous rolling unit - Google Patents

Abstract

The invention discloses a high-stage automotive sheet cold rolling production technology, and particularly relates to an emulsified liquid temperature optimization setting technology suitable for the high-stage automotive sheet production process of a five-rack cold continuous rolling unit. On the basis of a large amount of field test tracking and theoretical researching, giving consideration to equipment and process characteristics of high-stage automotive sheet production of the five-rack cold continuous rolling unit, an emulsified liquid temperature setting method suitable for the high-stage automobile sheet production process of the five-rack cold continuous rolling unit is provided with the minimum slippage and hot slip damage occurrence possibility of all racks in the five-rack cold continuous rolling unit as a target. By means of the method, emulsified liquid temperature optimization setting in the high-stage automotive sheet production process of the five-rack cold continuous rolling unit is achieved, the slippage and hot slip damage occurrence possibility can be reduced to the maximum degree, and the product quality and the production efficiency are effectively improved accordingly.

Description

Five Stands Cold Tandem Mill group emulsion temperature optimization establishing methods

Technical field

The present invention relates to a kind of high level automobile sheet cold-rolling production process technology, particularly a kind of emulsion temperature optimization setting technique be suitable in five Stands Cold Tandem Mill group high level automobile sheet production processes.

Background technology

As shown in Figure 1, in the production process of five Stands Cold Tandem Mill group high level automobile sheets, emulsion temperature plays very important impact to the lubrication of emulsion itself and cooling effect, and its affecting laws nonmonotonic increase or minimizing, extremely complicated.

On the one hand, along with the raising of emulsion temperature, in emulsion, oil body can decline, and lubrication and cooling effect can be deteriorated, and in roll gap, coefficient of friction can increase, and is conducive to the control to slipped defects in cold-rolled process, is but unfavorable for the control of heat slid wound defect.In addition on the one hand, when the temperature of emulsion is reduced to a certain degree, although its cooling effect can improve, but the activity of emulsion can be deteriorated, coefficient of friction in roll gap also can increase, and can make equally to produce a large amount of frictional heats in the operation of rolling, is unfavorable for the control of heat slid wound defect.

In the past, at the scene in production process for the setting of emulsion temperature, a given fixed value often, and do not set according to the actual condition of unit, the steel grade of band produced, specification and actual rolling technological parameter, portioned product is caused to occur aborning skidding or occurring heat slid wound problem, mill speed can only maintain reduced levels, not only affects production efficiency but also affects product quality, brings larger economic loss to enterprise.

According to commercially actual use after feedback, statistics display client is embodied in the requirement of slippery surface, sliding injury, finishing temperature fluctuation, coiling temperature fluctuation more to the requirement of steel product quality, and industry also has certain technical threshold and requirement to steel surface These parameters.

In view of the foregoing, how according to on-the-spot actual condition and produce the type of product, conscious setting emulsion temperature, reduces the probability skidding and occurs with heat slid wound, the emphasis just becoming with product quality and tackle key problems at scene of enhancing productivity.

Summary of the invention

Object of the present invention aims to provide a kind of five Stands Cold Tandem Mill group emulsion temperature optimization establishing methods, solves belt steel surface skidding in prior art, sliding injury rate is high, the problem that corresponding improvement efficiency is not high.

According to the present invention, a kind of five Stands Cold Tandem Mill group emulsion temperature optimization establishing methods are provided, comprise the following steps: step one, collect the main equipment parameters of unit, the characteristic parameter of band to be rolled, main rolling technological parameter, main technique lubricating regime parameter; Step 2, initializes temperature search procedure parameter, step-size in search and object function initial value; Step 3, calculates the coefficient of friction of the first to the 5th frame under the first emulsion temperature search procedure variable and current process lubricating regime; Step 4, calculate draught pressure and the rolling power of the first to the 5th frame under current reduction system, tension schedule, technological lubrication system, and it is pre-conditioned to judge whether draught pressure, rolling power meet; If so, then subsequent step is continued; If not, then step 7 is proceeded to; Step 5, calculates slip factor and the slip injury index of the first to the 5th frame under current process lubricating regime, and judges whether slip factor and slip injury index meet pre-conditioned; If so, then subsequent step is continued; If not, then step 7 is proceeded to; Step 6, computational efficiency and quality control objective function, and whether judging efficiency and quality control objective function meet pre-conditioned; If so, then change object function initial value and the second emulsion temperature search procedure variable, and continue subsequent step; If not, then directly subsequent step is entered; Step 7, judges whether the first emulsion temperature search procedure variable meets pre-conditioned; If so, then change emulsion temperature search procedure parameter, and return step 3; If not, then subsequent step is continued; Step 8, is set as the second emulsion temperature search procedure variable by best for emulsion design temperature.

According to one embodiment of the invention, step 2 also comprises: emulsion temperature search procedure parameter m=0, step-size in search Δ T _wd=0.1, object function initial value F ₀=10000.

According to one embodiment of the invention, step 3 also comprises: the first emulsion temperature search procedure variable wherein for unit emulsion license minimum temperature.

According to one embodiment of the invention, step 4 also comprises: under current reduction system, tension schedule, technological lubrication system, the draught pressure of the first to the 5th frame is P _i, rolling power is F _i.Wherein Rolling Pressure Calculation basic model is: $P=({\mathrm{\σ}}_s-q_m)B\sqrt{R^{\′}{H}_0\mathrm{\ϵ}}(1.08+1.79\mathrm{\μ\ϵ}\sqrt{\frac{R^{\′}}{h_0}}-1.02\mathrm{\ϵ}),$ For rolling P power in formula, R ' is for flattening radius, q _mfor equivalent tension force, σ _sfor average deformation drag, B is strip width, and μ is coefficient of friction, and ε is reduction ratio, H ₀for inlet thickness; Rolling power calculates basic model: in formula, F is rolling power, and η is electric efficiency, v _rfor roll rotational speed (m/min), R is roller diameter (m), and N is roll torque.

According to one embodiment of the invention, the pre-conditioned of draught pressure, rolling power is inequality $\left\{\begin{array}{c}{P}_i\≤0.9P_{i\max }\\ F_i\≤0.9F_{i\max }\end{array}\right.$ I=1,2 ..., whether 5 set up simultaneously, wherein P _imaxit is the maximum draught pressure of the first to the 5th frame; F _imaxit is the maximum rolling power of the first to the 5th frame.

According to one embodiment of the invention, step 5 also comprises: slip factor basic model is: $\mathrm{\ψ}=\frac{1}{4\mathrm{\μ}}|\sqrt{\frac{\mathrm{\Δh}}{R^{\′}}}+\frac{T_0-T_1}{P}|,$ In formula, ψ is slip factor, T ₁, T ₀for front and back tension force, R' is that working roll flattens radius, and P is total draught pressure, and μ is coefficient of friction, and Δ h is drafts; The basic model of slip injury index is: wherein 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.Wherein in formula, a is fluid friction influence coefficient, and b is dry friction influence coefficient, B _ξfor coefficient of friction damped expoential, ξ ₀for the oil film thickness under current working.

According to one embodiment of the invention, slip factor and the pre-conditioned of slip injury index are inequality i=1,2 ..., whether 5 set up simultaneously, wherein ψ ^*for critical slip factor value; for critical slip injury index.

According to one embodiment of the invention, step 6 also comprises: effect and quality Controlling object function F is: wherein α=0.3-0.7 is weight coefficient.

According to one embodiment of the invention, change object function initial value F ₀=F, and change the second emulsion temperature search procedure variable

According to one embodiment of the invention, step 7 also comprises: the pre-conditioned of the first emulsion temperature search procedure variable is inequality whether set up.

According to one embodiment of the invention, change emulsion temperature search procedure parameter m=m+1.

Have employed technical scheme of the present invention, farthest can reduce the probability of happening of skidding, heat slid wound, thus effectively improve product quality and production efficiency.

Accompanying drawing explanation

In the present invention, identical figure mark represents identical feature all the time, wherein:

Fig. 1 is the apparatus sketch of five Stands Cold Tandem Mill groups;

In the production of Fig. 2 five Stands Cold Tandem Mill group Automobile Plate, emulsion temperature optimization sets total computing block diagram.

Detailed description of the invention

Technical scheme of the present invention is further illustrated below in conjunction with drawings and Examples.

In the past, at the scene in process of production for the setting of emulsion temperature, a given fixed value often, and not according to the actual condition of unit, the steel grade of the band produced, specification and actual rolling technological parameter are set, portioned product is caused to occur aborning skidding or occurring heat slid wound problem, mill speed can only maintain reduced levels, the invention provides one be suitable for five Stands Cold Tandem Mill group Automobile Plate produce in emulsion temperature optimization determine technology, farthest skidding can be reduced by this technology, the probability of happening of heat slid wound, thus effectively improve product quality and production efficiency.

In order to realize above object, the present invention by the following technical solutions: one be suitable for five Stands Cold Tandem Mill group Automobile Plate produce in emulsion temperature optimization determine method, comprise the following step (computing block diagram is shown in Fig. 2) that can be performed by computer:

A () collects the main equipment parameters of five Stands Cold Tandem Mill groups of setting to be optimized, mainly comprise: the working roll roller footpath D of 1-5 frame _iwi=1,2 ..., 5; The maximum draught pressure P of 1-5 frame _imax; The maximum rolling power F of 1-5 frame _imax;

B () collects the characteristic parameter of band to be rolled, mainly comprise: the width B of band; The thickness h of strip material ₀; The elastic modulus E of band; The Poisson's ratio v of band; The initial deformation drag σ of band _s0; Resistance of deformation coefficient of intensification k;

C () collects main rolling technological parameter, mainly comprise band exit thickness h ₅; 1-5# frame reduction ratio ε _i; Entrance tension force T ₀; 1-5# rack outlet tension force T _i; Critical slip factor value ψ ^*; Critical slip injury index 5# rack outlet speed V ₅;

D () collects main technique lubricating regime parameter, mainly comprise the flow flow of 1-5# frame emulsion _i; The concentration C of emulsion; Unit emulsion license minimum temperature unit emulsion license maximum temperature

E () defines five Stands Cold Tandem Mill group Automobile Plate production efficiency and quality control objective function F; Object function initial value F ₀; Emulsion temperature search procedure parameter m; Emulsion temperature step-size in search Δ T _wd; Emulsion temperature search procedure variable optimum emulsification liquid temp 1-5# frame slip factor ψ _i, slip injury index coefficientoffrictionμ _i, draught pressure P _i, rolling power F _i; Wherein Rolling Pressure Calculation basic model is: $P=({\mathrm{\σ}}_s-q_m)B\sqrt{R^{\′}{H}_0\mathrm{\ϵ}}(1.08+1.79\mathrm{\μ\ϵ}\sqrt{\frac{R^{\′}}{h_0}}-1.02\mathrm{\ϵ}),$ For rolling P power in formula, R ' is for flattening radius, q _mfor equivalent tension force, σ _sfor average deformation drag, B is strip width, and μ is coefficient of friction, and ε is reduction ratio, H ₀for inlet thickness; Rolling power calculates basic model: in formula, F is rolling power, and η is electric efficiency, v _rfor roll rotational speed (m/min), R is roller diameter (m), and N is roll torque.

F () makes emulsion temperature search procedure parameter m=0, step-size in search Δ T _wd=0.1, object function initial value F ₀=10000;

G () calculates emulsion temperature search procedure variable

H () calculates the coefficientoffrictionμ of 1-5# frame under current process lubricating regime _i; Wherein in formula, a is fluid friction influence coefficient, and b is dry friction influence coefficient, B _ξfor coefficient of friction damped expoential, ξ ₀for the oil film thickness under current working;

(i) calculate the draught pressure P of 1-5# frame under current reduction system, tension schedule, technological lubrication system _i, 1-5# frame rolling power F _i;

J () judges inequality $\left\{\begin{array}{c}{P}_i\≤0.9P_{i\max }\\ F_i\≤0.9F_{i\max }\end{array}\right.$ I=1,2 ..., whether 5 set up simultaneously? if inequality is set up, then proceed to step (k), otherwise proceed to step (p);

The slip factor ψ of 1-5# frame under (k) calculating current process lubricating regime _i, wherein slip factor basic model is: in formula, ψ is slip factor, T ₁, T ₀for front and back tension force, R' is that working roll flattens radius, and P is total draught pressure, and μ is coefficient of friction, and Δ h is drafts;

L () calculates the slip injury index of current process lubricating regime 1-5# frame wherein the basic model of slip injury index is: wherein 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;

M () judges inequality i=1,2 ..., whether 5 set up simultaneously? if inequality is set up, then proceed to step (n), otherwise proceed to step (p);

N () calculates five Stands Cold Tandem Mill group Automobile Plate effect and quality Controlling object function F, wherein wherein α=0.3-0.7 is weight coefficient;

O () judges inequality F<F ₀set up? if inequality is set up, F ₀=F, proceed to step (p); Otherwise, directly proceed to step (p);

P () judges inequality set up? if inequality is set up, make m=m+1, proceed to step (g); Otherwise proceed to step (q);

Q () obtains the best design temperature of emulsion complete emulsion temperature optimization in five Stands Cold Tandem Mill group Automobile Plate productions fixed.

Below by 2 embodiments, above-mentioned technical scheme is described.

first embodiment

Fig. 2 is that in producing according to the present invention five Stands Cold Tandem Mill group Automobile Plate, emulsion temperature optimization sets total computing block diagram.Now for certain five frame 1420 milling train, the high level automobile sheet rolling pressure assignment procedure of specific standard is described by means of Fig. 2.

First, in step 1, collect the main equipment parameters of five Stands Cold Tandem Mill groups of setting to be optimized, mainly comprise: the working roll roller footpath D of 1-5 frame _iw=500,500,450,450,420}i=1,2 ..., 5; The maximum draught pressure P of 1-5 frame _imax={ 1800t, 1800t, 1800t, 1800t, 1800t}; The maximum rolling power F of 1-5 frame _imax={ 2680Kw, 4000Kw, 4000Kw, 4000Kw, 5000Kw};

Subsequently, in step 2, collect the characteristic parameter of band to be rolled, mainly comprise: the width B=1200mm of band; The thickness h of strip material ₀=2.75mm; Elastic modulus E=2.1 × 10 of band ⁵mPa; The Poisson's ratio v=0.3 of band; The initial deformation drag σ of band _s0=400MPa; Resistance of deformation coefficient of intensification k=1.3;

Subsequently, in step 3, collect main rolling technological parameter, mainly comprise band exit thickness h ₅=0.404mm; 1-5# frame reduction ratio ε _i={ 0.28,0.40.0.34,0.31.0.26}; Entrance tension force T ₀=50MPa; 1-5# rack outlet tension force T _i={ 175,170,170,170,80}MPa; Critical slip factor value ψ ^*=0.4; Critical slip injury index 5# rack outlet speed V ₅=1030m/min;

Subsequently, in step 4, collect main technique lubricating regime parameter, mainly comprise the flow of 1-5# frame emulsion concentration C=2% of emulsion; Unit emulsion license minimum temperature unit emulsion license maximum temperature

Subsequently, in steps of 5, five Stands Cold Tandem Mill group Automobile Plate production efficiency and quality control objective function F are defined; Object function initial value F ₀; Emulsion temperature search procedure parameter m; Emulsion temperature step-size in search Δ T _wd; Emulsion temperature search procedure variable optimum emulsification liquid temp 1-5# frame slip factor ψ _i, slip injury index coefficientoffrictionμ _i, draught pressure P _i, rolling power F _i;

Subsequently, in step 6, emulsion temperature search procedure parameter m=0, step-size in search Δ T is made _wd=0.1, object function initial value F ₀=10000;

Subsequently, in step 7, emulsion temperature search procedure variable is calculated

Subsequently, in step 8, the coefficientoffrictionμ of 1-5# frame under current process lubricating regime is calculated _i={ 0.0845,0.0570,0.0270,0.0241,0.0207};

Subsequently, in step 9, the draught pressure P of 1-5# frame under current reduction system, tension schedule, technological lubrication system is calculated _i=={ 822.3,888.1,683.3,689.1,682.8) the rolling power F of t, 1-5# frame _i={ 695.8,3532.8,3376.9,3408.9,3685.2}Kw;

Subsequently, in step 10, inequality is judged $\left\{\begin{array}{c}{P}_i\&le;0.9P_{i\max }\\ F_i\&le;0.9F_{i\max }\end{array}\right.$ I=1,2 ..., whether 5 set up simultaneously? obvious inequality is set up, and proceeds to step 11;

Subsequently, in a step 11, the slip factor ψ of 1-5# frame under current process lubricating regime is calculated _i={ 0.26,0.278,0.303,0.421,0.384};

Subsequently, in step 12, the slip injury index of current process lubricating regime 1-5# frame is calculated

Subsequently, in step 13, judge inequality i=1,2 ..., whether 5 set up simultaneously? obviously, inequality is false, and proceeds to step 16;

Subsequently, at step 14, five Stands Cold Tandem Mill group Automobile Plate effect and quality Controlling object function F are calculated, wherein wherein α=0.6 is weight coefficient;

Subsequently, in step 15, inequality F<F is judged ₀set up? if inequality is set up, F ₀=F, proceed to step 16; Otherwise, directly proceed to step 16;

Subsequently, in step 16, inequality is judged set up? obvious inequality is set up, and makes m=m+1=1, proceeds to step 7;

Finally, in step 17, the best design temperature of emulsion is obtained complete emulsion temperature optimization in five Stands Cold Tandem Mill group Automobile Plate productions fixed.

Conveniently compare, as shown in table 1, provide the design temperature and corresponding target function value thereof that adopt the method for the invention and the emulsion that conventional method draws respectively, as can be seen from the table, after adopting this method, for representing that the target function value that high level automobile sheet effect and quality controls drops to 0.96 from 1.22, have dropped 21.31%, well improve the quality of production of unit.

The relevant parameter contrast table that certain five frame 1420 milling train the present invention of table 1 and conventional method obtain

?	Emulsion temperature	Object function
			Conventional method	45.2℃	1.22
The present invention	55.3℃	0.96

second embodiment

In order to further instruction implementation process originally, then for certain five frame 1550 milling train, the high level automobile sheet operation of rolling emulsion temperature optimization describing specific standard by means of Fig. 2 determines process.

First, in step 1, collect the main equipment parameters of five Stands Cold Tandem Mill groups of setting to be optimized, mainly comprise: the working roll roller footpath D of 1-5 frame _iw={ 530,470,500,531,428}i=1,2, L, 5; The maximum draught pressure P of 1-5 frame _imax={ 2000t, 2000t, 2000t, 2000t, 2000t}; The maximum rolling power F of 1-5 frame _imax={ 350Kw, 5000Kw, 5000Kw, 5000Kw, 5000Kw};

Subsequently, in step 2, collect the characteristic parameter of band to be rolled, mainly comprise: the width B=1320mm of band; The thickness h of strip material ₀=3mm; Elastic modulus E=2.1 × 10 of band ⁵mPa; The Poisson's ratio v=0.3 of band; The initial deformation drag σ of band _s0=400MPa; Resistance of deformation coefficient of intensification k=1.3;

Subsequently, in step 3, collect main rolling technological parameter, mainly comprise band exit thickness h ₅=0.505mm; 1-5# frame reduction ratio ε _i={ 0.27,0.376.0.339,0.30.0.20}; Entrance tension force T ₀=50MPa; 1-5# rack outlet tension force T _i={ 162,164,164,156,70}MPa; Critical slip factor value ψ ^*=0.4; Critical slip injury index 5# rack outlet speed V ₅=850m/min;

Subsequently, in step 4, collect main technique lubricating regime parameter, mainly comprise the flow of 1-5# frame emulsion concentration C=2% of emulsion; Unit emulsion license minimum temperature unit emulsion license maximum temperature

Subsequently, in steps of 5, five Stands Cold Tandem Mill group Automobile Plate production efficiency and quality control objective function F are defined; Object function initial value F ₀; Emulsion temperature search procedure parameter m; Emulsion temperature step-size in search Δ T _wd; Emulsion temperature search procedure variable optimum emulsification liquid temp 1-5# frame slip factor ψ _i, slip injury index coefficientoffrictionμ _i, draught pressure P _i, rolling power F _i;

Subsequently, in step 6, emulsion temperature search procedure parameter m=0, step-size in search Δ T is made _wd=0.1, object function initial value F ₀=10000;

Subsequently, in step 7, emulsion temperature search procedure variable is calculated

Subsequently, in step 8, the coefficientoffrictionμ of 1-5# frame under current process lubricating regime is calculated _i={ 0.0826,0.0541,0.0293,0.0204,0.0176};

Subsequently, in step 9, the draught pressure P of 1-5# frame under current reduction system, tension schedule, technological lubrication system is calculated _i=={ 780.2,881.9,816.6,756.1,632.5) the rolling power F of t, 1-5# frame _i={ 716.0,3270.4,3491.5,3599.9,3097.1}Kw;

Subsequently, in step 10, inequality is judged $\left\{\begin{array}{c}{P}_i\&le;0.9P_{i\max }\\ F_i\&le;0.9F_{i\max }\end{array}\right.$ I=1,2 ..., whether 5 set up simultaneously? obvious inequality is set up, and proceeds to step 11;

Subsequently, in a step 11, the slip factor ψ of 1-5# frame under current process lubricating regime is calculated _i=0.232,0.245,0.323,0.408,0.387},

Subsequently, in step 12, the slip injury index of current process lubricating regime 1-5# frame is calculated

Subsequently, in step 13, judge inequality i=1,2 ..., whether 5 set up simultaneously? obviously, inequality is false, and proceeds to step 16;

Subsequently, at step 14, five Stands Cold Tandem Mill group Automobile Plate effect and quality Controlling object function F are calculated, wherein wherein α=0.5 is weight coefficient;

Subsequently, in step 15, inequality F<F is judged ₀set up? if inequality is set up, F ₀=F, proceed to step 16; Otherwise, directly proceed to step 16;

Subsequently, in step 16, inequality is judged set up? obvious inequality is set up, and makes m=m+1=1, proceeds to step 7;

Finally, in step 17, the best design temperature of emulsion is obtained complete emulsion temperature optimization in five Stands Cold Tandem Mill group Automobile Plate productions fixed.

Conveniently compare, as shown in table 2, provide the design temperature and corresponding target function value thereof that adopt the method for the invention and the emulsion that conventional method draws respectively, as can be seen from the table, after adopting this method, for representing that the target function value that high level automobile sheet effect and quality controls drops to 0.79 from 1.08, have dropped 24,07%, well improve the quality of production of unit.

The relevant parameter contrast table that certain five frame 1550 milling train the present invention of table 2 and conventional method obtain

?	Emulsion temperature	Object function
			Conventional method	48.3℃	1.08
The present invention	57.9℃	0.82

The present invention follows the tracks of on the basis with theoretical research in a large amount of field trials, consider the equipment and technology feature that five Stands Cold Tandem Mill group high level automobile sheets are produced, minimum for target with five probability that Stands Cold Tandem Mill group institute organic frames skid and heat slid wound occurs, propose a set of emulsion temperature optimization establishing method be suitable in five Stands Cold Tandem Mill group high level automobile sheet production processes.The method, by the Optimal Setting of the emulsion temperature in five Stands Cold Tandem Mill group high level automobile sheet production processes, farthest can reduce the probability of happening of skidding, heat slid wound, thus effectively improve product quality and production efficiency.

Those of ordinary skill in the art will be appreciated that, above description is only one or more embodiments in the numerous embodiment of the present invention, and not uses limitation of the invention.Any equalization for the above embodiment changes, modification and the equivalent technical scheme such as to substitute, as long as spirit according to the invention, all will drop in scope that claims of the present invention protect.

Claims (10)

1. five Stands Cold Tandem Mill group emulsion temperature optimization establishing methods, is characterized in that, comprise the following steps:

Step one, collects the main equipment parameters of unit, the characteristic parameter of band to be rolled, main rolling technological parameter, main technique lubricating regime parameter;

Step 2, initializes temperature search procedure parameter, step-size in search and object function initial value;

Step 3, calculates the coefficient of friction of the first to the 5th frame under the first emulsion temperature search procedure variable and current process lubricating regime;

Step 4, calculate draught pressure and the rolling power of the first to the 5th frame under current reduction system, tension schedule, technological lubrication system, and it is pre-conditioned to judge whether described draught pressure, rolling power meet; If so, then subsequent step is continued; If not, then step 7 is proceeded to;

Step 5, calculates slip factor and the slip injury index of the first to the 5th frame under current process lubricating regime, and judges whether described slip factor and slip injury index meet pre-conditioned; If so, then subsequent step is continued; If not, then step 7 is proceeded to;

Step 6, computational efficiency and quality control objective function, and judge whether described effect and quality Controlling object function meets pre-conditioned; If so, then change object function initial value and the second emulsion temperature search procedure variable, and continue subsequent step; If not, then directly subsequent step is entered;

Step 7, judges whether described first emulsion temperature search procedure variable meets pre-conditioned; If so, then change emulsion temperature search procedure parameter, and return step 3; If not, then subsequent step is continued;

Step 8, is set as described second emulsion temperature search procedure variable by best for emulsion design temperature.

2. five Stands Cold Tandem Mill group emulsion temperature optimization establishing methods as claimed in claim 1, it is characterized in that, described step 2 also comprises:

Emulsion temperature search procedure parameter m=0, step-size in search Δ T _wd=0.1, object function initial value F ₀=10000.

3. five Stands Cold Tandem Mill group emulsion temperature optimization establishing methods as claimed in claim 2, it is characterized in that, described step 3 also comprises:

Described first emulsion temperature search procedure variable wherein for unit emulsion license minimum temperature.

4. five Stands Cold Tandem Mill group emulsion temperature optimization establishing methods as claimed in claim 3, it is characterized in that, described step 4 also comprises:

Under described current reduction system, tension schedule, technological lubrication system, the draught pressure of the first to the 5th frame is P _i, rolling power is F _i; Wherein Rolling Pressure Calculation basic model is: $P=({\mathrm{\&sigma;}}_s-q_m)B\sqrt{R^{\&prime;}{H}_0\mathrm{\&epsiv;}}(1.08+1.79\mathrm{\&mu;\&epsiv;}\sqrt{\frac{R^{\&prime;}}{h_0}}-1.02\mathrm{\&epsiv;}),$ For rolling P power in formula, R ' is for flattening radius, q _mfor equivalent tension force, σ _sfor average deformation drag, B is strip width, and μ is coefficient of friction, and ε is reduction ratio, H ₀for inlet thickness; Rolling power calculates basic model: in formula, F is rolling power, and η is electric efficiency, v _rfor roll rotational speed (m/min), R is roller diameter (m), and N is roll torque.

5. five Stands Cold Tandem Mill group emulsion temperature optimization establishing methods as claimed in claim 4, is characterized in that:

The pre-conditioned of described draught pressure, rolling power is inequality $\left\{\begin{array}{c}{P}_i\&le;0.9P_{i\max }\\ F_i\&le;0.9F_{i\max }\end{array}\right.$ I=1,2 ..., whether 5 set up simultaneously, wherein P _imaxit is the maximum draught pressure of the first to the 5th frame; F _imaxit is the maximum rolling power of the first to the 5th frame.

6. five Stands Cold Tandem Mill group emulsion temperature optimization establishing methods as claimed in claim 5, it is characterized in that, described step 5 also comprises:

Described slip factor basic model is: in formula, ψ is slip factor, T ₁, T ₀for front and back tension force, R' is that working roll flattens radius, and P is total draught pressure, and μ is coefficient of friction, and Δ h is drafts; Wherein in formula, a is fluid friction influence coefficient, and b is dry friction influence coefficient, B _ξfor coefficient of friction damped expoential, ξ ₀for the oil film thickness under current working;

The basic model of described slip injury index is: wherein 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.

7. five Stands Cold Tandem Mill group emulsion temperature optimization establishing methods as claimed in claim 6, is characterized in that:

Described slip factor and the pre-conditioned of slip injury index are inequality i=1,2 ..., whether 5 set up simultaneously, wherein ψ ^*for critical slip factor value; for critical slip injury index.

8. five Stands Cold Tandem Mill group emulsion temperature optimization establishing methods as claimed in claim 7, it is characterized in that, described step 6 also comprises:

Described effect and quality Controlling object function F is:

wherein α=0.3-0.7 is weight coefficient.

9. five Stands Cold Tandem Mill group emulsion temperature optimization establishing methods as claimed in claim 8, is characterized in that:

Change object function initial value F ₀=F, and change the second emulsion temperature search procedure variable $T_{\mathrm{wd}}^2=T_{\mathrm{wd}}^1\&CenterDot;$

10. five Stands Cold Tandem Mill group emulsion temperature optimization establishing methods as claimed in claim 9, it is characterized in that, described step 7 also comprises:

Described first the pre-conditioned of emulsion temperature search procedure variable is inequality whether set up;

Described change emulsion temperature search procedure parameter is m=m+1.