A method for optimizing selection of an emulsion tank for a six-pass mode of a 5+1 type tandem cold rolling mill

Abstract

The application discloses a kind of 5+1 type cold continuous rolling mill six pass mode emulsion oil tank optimization selection method, 5+1 type cold continuous rolling mill includes five conventional rolling mill and the fourth rack small roller diameter rolling mill, emulsion oil tank optimization selection method includes the following steps: the six racks selected are numbered;Collect 5+1 type cold continuous rolling mill basic equipment parameters;Collect rolling process parameters;Collect 5+1 type cold continuous rolling mill emulsion related parameters;Six pass rolling mode emulsion oil tank combination selection;Set related parameters in emulsion oil tank optimization process;Set initial parameters in emulsion oil tank optimization process, give the step of optimization;Emulsion concentration and emulsion temperature selection;Calculate the objective function of each emulsion oil tank combination;The emulsion oil tank combination sorting corresponding to the maximum value of objective function is output.This method realizes the optimization of mill comprehensive rolling capacity utilization, guarantees the rolling stability and finished product quality of ultrahigh-strength steel cold continuous rolling process.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cold rolling technology, in particular to a 5+1 type cold continuous rolling mill six-pass mode emulsion tank optimization selection method. BACKGROUND

[0002] With the rapid development of the national economy, the market and users of steel materials are more and more demanding on the types and quantities. In order to produce higher strength steel products to meet the needs of production and development, a new six-stand cold continuous rolling mill is built in a domestic factory, of which five stands are relocated from the original 1750 pickling and rolling mill, and one small roller diameter stand is newly added. Considering the work hardening degree of each pass, the production efficiency of the mill and the motor power and other factors, the newly added small roller diameter stand is the fourth stand. The six-stand cold continuous rolling mill composed of five conventional rolling mills and one small roller diameter rolling mill is first applied at home and abroad.

[0003] At present, the 5+1 type cold continuous rolling mill has two modes of six-pass mode and five-pass mode. In the five-pass mode, the fourth stand is stopped. In order to ensure the reasonable distribution of emulsion, keep the rolling process stable and the quality of finished products qualified, and achieve good economic effect, the 5+1 type cold continuous rolling mill is equipped with four emulsion tanks and adopts a 3+1 type emulsion circulating supply mode. Considering that the emulsion may be distributed unreasonably in the rolling process, which may lead to problems such as slipping or hot scratch that endanger the quality of the strip, one emulsion tank is reserved as an emergency standby emulsion tank for the 5+1 type cold continuous rolling mill. However, the optimal problem of the pass configuration of the remaining three emulsion tanks has not been determined, and there is an urgent need for an optimization method suitable for the reasonable configuration of the emulsion tank of the 5+1 type cold continuous rolling mill in the six-pass mode, which is of great significance to the rolling stability of the strip. SUMMARY

[0004] The present application aims to provide a 5+1 type cold continuous rolling mill six-pass mode emulsion tank optimization selection method, which realizes the optimization of the comprehensive rolling capacity utilization of the mill, guarantees the rolling stability and the quality of finished products in the cold continuous rolling process of ultra-high strength steel, and thus achieves the purpose of efficient, stable and batch production of ultra-high strength steel.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solution:

[0006] A 5+1 type cold continuous rolling mill six-pass mode emulsion tank optimization selection method, the 5+1 type cold continuous rolling mill comprising five conventional rolling mills and a fourth stand small roller diameter rolling mill, the emulsion tank optimization selection method comprising the following steps executed by a computer:

[0007] (a) The selected six stands are represented in turn by subscript i, i.e. i = 1, 2, 3, 4, 5, 6;

[0008] (b) Collecting 5+1 type cold continuous rolling mill set basic equipment parameters, including: the work roll diameter D of the conventional rolling mill and the 4th stand small roll diameter rolling mill wi , the maximum rolling force allowable value P imax , the maximum rolling power allowable value N imax , wherein,

[0009] D wi ={D w1 ,D w2 ,D w3 ,D w4 ,D w5 ,D w6},

[0010] P imax ={P 1max ,P 2max ,P 3max ,P 4max ,P 5max ,P 6max},

[0011] N imax ={N 1max ,N 2max ,N 3max ,N 4max ,N 5max ,N 6max};

[0012] (c) Collecting rolling process parameters, including: strip steel inlet thickness h0, strip steel width B, strip steel yield strength σ s , strip steel inlet tension T0, strip steel outlet tension T of each stand i , strip steel outlet thickness h of each stand i , the critical value of the upper surface slip factor of each stand strip steel ψ * si , the critical value of the lower surface slip factor of each stand strip steel ψ * xi , wherein T i ={T1,T2,T3,T4,T5,T6}, h i ={h1,h2,h3,h4,h5,h6}, ψ * si ={ψ * s1 ,ψ * s2 ,ψ * s3 ,ψ * s4 ,ψ * s5 ,ψ* s6},ψ * xi ={ψ * x1 ,ψ * x2 ,ψ * x3 ,ψ * x4 ,ψ * x5 ,ψ * x6};

[0013] (d)Collecting 5+1 type cold continuous rolling mill set emulsion related parameters, including: the minimum value of the emulsion concentration used by the unit c min , the minimum value of the initial temperature of the emulsion used by the unit t min ;

[0014] (e)Six pass rolling mode emulsion tank combination selection: select one of the emulsion tanks A, B, C corresponding to each stand in the six pass rolling mode, and the emulsion tank combination mode in the six pass rolling mode includes four kinds, the first kind of emulsion tank combination is: A, A, A, B, A, C; The second kind of emulsion tank combination is: A, A, A, B, A, A; The third kind of emulsion tank combination is: A, A, A, A, A, C; The fourth kind of emulsion tank combination is: A, A, A, A, A, A; Wherein, the emulsion tank A is a large volume tank, and the emulsion tank B and the emulsion tank C are small volume tanks;

[0015] (f) Set the related parameters in the emulsion tank optimization process, including: setting the emulsion concentration of the emulsion tank A as c A , the emulsion temperature of the emulsion tank A as t A , the emulsion concentration of the emulsion tank B as c B , the emulsion temperature of the emulsion tank B as t B , the emulsion concentration of the emulsion tank C as c C , the emulsion temperature of the emulsion tank C as t C , and the objective function of the six pass rolling mode emulsion tank combination as G z (X z );

[0016] (g) Set the initial parameters k1, k2, k3, k4, k5, k6 in the emulsion tank optimization process,

[0017] Given the step size of optimization Δθ;

[0018] (h) The emulsion concentration and emulsion temperature selection of the oil tank combination of A, A, A, B, A, C is as follows:

[0019] (h1) Let k1=0, k2=0;

[0020] (h2) Let t A =t min +k2Δθ;

[0021] (h3) Calculate the rolling pressure P j , the rolling power N j , the upper surface slip factor ψ sj of the strip, the lower surface slip factor ψ xj of the strip, the upper surface thermal galling index of the strip, and the lower surface thermal galling index of the strip, where j=1, 2, 3, 5;

[0022] (h4) Determine whether P j ≤η1P jmax , N j ≤η2N jmax , ψ sj ≤ψ * sj , ψ xj ≤ψ * xj , are all true; if true, then k1=0, k2=0, and go to step (h5); if not true, then k1=k1+1, k2=k2+1, and go to step (h2); where η1 and η2 are both safety factors;

[0023] (h5) Let k3=0, k4=0;

[0024] (h6) Let t B =t min +k4Δθ;

[0025] (h7) Calculate the rolling pressure P j , the rolling power N j , the upper surface slip factor ψ sj of the strip, the lower surface slip factor ψ xj of the strip, the upper surface thermal galling index of the strip, and the lower surface thermal galling index of the strip, where j=4;

[0026] (h8) Determine whether P j ≤η1P jmax , N j ≤η2Njmax ,ψ sj ≤ψ * sj ,ψ xj ≤ψ * xj , whether all are established; if yes, k3=0, k4=0, turn to step (h9); if not, k3=k3+1, k4=k4+1, turn to step (h6); wherein, η1 and η2 are both safety factors;

[0027] (h9) let k5=0, k6=0;

[0028] (h10) let t c =t min +k6Δθ;

[0029] (h11) calculate rolling pressure P j , rolling power N j , strip upper surface slip factor ψ sj , strip lower surface slip factor ψ xj , strip upper surface thermal scratch index strip lower surface thermal scratch index wherein, j=6;

[0030] (h12) judge whether P j ≤η1P jmax , N j ≤η2N jmax , ψ sj ≤ψ * sj , ψ xj ≤ψ * xj , whether all are established; if yes, k5=0, k6=0, turn to step (i); if not, k5=k5+1, k6=k6+1, turn to step (h10); wherein, η1 and η2 are both safety factors;

[0031] (i) A, A, A, B, A, A tank combination of emulsion concentration and emulsion temperature selection, the specific steps are as follows:

[0032] (i1) let t A =t min +k2Δθ;

[0033] (i2) calculate rolling pressure P j , rolling power N jthe upper surface slip factor of the strip ψ sj the lower surface slip factor of the strip ψ xj the upper surface thermal galling index of the strip the lower surface thermal galling index of the strip wherein j = 1, 2, 3, 5, 6;

[0034] (i3) judging whether P j ≤ η1P jmax , N j ≤ η2N jmax , ψ sj ≤ ψ * sj , ψ xj ≤ ψ * xj , are all established; if so, k1 = 0, k2 = 0, and the step (i4) is entered; if not, k1 = k1 + 1, k2 = k2 + 1, and the step (i1) is entered; wherein η1 and η2 are both safety factors;

[0035] (i4) setting t B = t min + k4Δθ;

[0036] (i5) calculating the rolling pressure P j , the rolling power N j , the upper surface slip factor of the strip ψ sj , the lower surface slip factor of the strip ψ xj , the upper surface thermal galling index of the strip the lower surface thermal galling index of the strip wherein j = 4;

[0037] (i6) judging whether P j ≤ η1P jmax , N j ≤ η2N jmax , ψ sj ≤ ψ * sj , ψ xj ≤ ψ * xj , are all established; if so, k3 = 0, k4 = 0, and the step (j) is entered; if not, k3 = k3 + 1, k4 = k4 + 1, and the step (i4) is entered; wherein η1 and η2 are both safety factors;

[0038] (j) A, A, A, A, A, C tank combination of emulsion concentration and emulsion temperature selection, the specific steps are as follows:

[0039] (j1) Let t A = t min + k1Δθ;

[0040] (j2) Calculate rolling pressure P j , rolling power N j , strip upper surface slip factor ψ sj , strip lower surface slip factor ψ xj , strip upper surface thermal galling index strip lower surface thermal galling index where j = 1, 2, 3, 4, 5;

[0041] (j3) Determine whether P j ≤ η1P jmax , N j ≤ η2N jmax , ψ sj ≤ ψ * sj , ψ xj ≤ ψ * xj , are all true; if true, then k1 = 0, k2 = 0, go to step (j4); if not true, then k1 = k1 + 1, k2 = k2 + 1, go to step (j1); where η1 and η2 are both safety factors;

[0042] (j4) Let t c = t min + k6Δθ;

[0043] (j5) Calculate rolling pressure P j , rolling power N j , strip upper surface slip factor ψ sj , strip lower surface slip factor ψ xj , strip upper surface thermal galling index strip lower surface thermal galling index where j = 6;

[0044] (j6) Determine whether P j ≤ η1P jmax , N j ≤ η2N jmax , ψ sj ≤ ψ * sj , ψ xj ≤ ψ * xj , If all are true, then k5=0, k6=0, and go to step (k); if not, then k5=k5+1, k6=k6+1, and go to step (j4); wherein η1 and η2 are safety factors;

[0045] (k) A, A, A, A, A, A tank combination emulsion concentration and emulsion temperature selection, the specific steps are as follows:

[0046] (k1) Let t A =t min +k2Δθ;

[0047] (k2) Calculate the rolling pressure P j , rolling power N j , strip upper surface slip factor ψ sj , strip lower surface slip factor ψ xj , strip upper surface thermal scratch index strip lower surface thermal scratch index Wherein, j=1, 2, 3, 4, 5, 6;

[0048] (k3) Determine whether P j ≤η1P jmax ,N j ≤η2N jmax ,ψ sj ≤ψ * sj ,ψ xj ≤ψ * xj , If all are true, then k1=0, k2=0, and go to step (l); if not, then k1=k1+1, k2=k2+1, and go to step (k1); wherein η1 and η2 are safety factors;

[0049] (l) Calculate the target function G z (X z ) of four emulsion tank combinations respectively, and the target function calculation formula is:

[0050] Wherein, a s is the influence coefficient of the upper surface slip factor of the strip in the emulsion tank optimization process, b s is the influence coefficient of the upper surface thermal scratch index of the strip in the emulsion tank optimization process, a x is the influence coefficient of the lower surface slip factor of the strip in the emulsion tank optimization process, b x is the influence coefficient of the lower surface thermal scratch index of the strip in the emulsion tank optimization process, msx is the slip difference adjustment coefficient under the six-pass rolling mode, n sx is the hot galling difference adjustment coefficient under the six-pass rolling mode;

[0051] (m) comparing the objective functions G of the four emulsion tank combinations z (X z , and outputting the emulsion tank combination ranking corresponding to the maximum value of the objective function.

[0052] The present application has the following beneficial effects: by using the method, the optimal combination of emulsion tank connections of each stand under the six-pass rolling mode can be given, the slip factor and the hot galling index are optimized, thereby effectively improving the rolling stability of the strip steel, ensuring the rolling stability and product quality in the cold continuous rolling process of the ultra-high strength steel, improving the product shape quality, and having important significance for the production economy of the 5+1 type cold continuous rolling unit. BRIEF DESCRIPTION OF DRAWINGS

[0053] Figure 1 is a flowchart of a 5+1 type cold continuous rolling unit six-pass mode emulsion tank optimization selection method of the present application.

[0054] Figure 2 is an emulsion concentration and emulsion temperature selection flowchart of the first emulsion tank combination.

[0055] Figure 3 is an emulsion concentration and emulsion temperature selection flowchart of the second emulsion tank combination.

[0056] Figure 4 is an emulsion concentration and emulsion temperature selection flowchart of the third emulsion tank combination.

[0057] Figure 5 is an emulsion concentration and emulsion temperature selection flowchart of the fourth emulsion tank combination. DETAILED DESCRIPTION

[0058] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0059] As shown in Figure 1 , a 5+1 type cold continuous rolling unit six-pass mode emulsion tank optimization selection method, the 5+1 type cold continuous rolling unit includes five conventional rolling mills and a fourth stand small roller diameter rolling mill, the emulsion tank optimization selection method includes the following steps executed by a computer.

[0060] Example 1:

[0061] (a) The selected six stands are represented in turn by subscript i, i = 1, 2, 3, 4, 5, 6;

[0062] (b) Collecting the basic equipment parameters of the 5+1 type tandem cold rolling mill set, including: the work roll diameter of the conventional rolling mill and the 4th stand small roll diameter rolling mill

[0063] D wi = {D w1 , D w2 , D w3 , D w4 , D w5 , D w6} = { 450, 450, 450, 450, 450, 450} mm

[0064] { 455, 455, 455, 360, 455, 455} mm, maximum allowable rolling force

[0065] P imax = {P 1max , P 2max , P 3max , P 4max , P 5max , P 6max} = { 450, 450, 450, 450, 450, 450} mm

[0066] { 27000, 27000, 27000, 27000, 27000, 27000} KN,

[0067] Maximum allowable rolling power

[0068] N imax = {N 1max , N 2max , N 3max , N 4max , N 5max , N 6max} = { 450, 450, 450, 450, 450, 450} mm

[0069] { 4200, 6000, 6000, 6400, 6000, 6000} KW;

[0070] (c) Collecting the rolling process parameters, including: the strip inlet thickness h0 = 3.525 mm, the strip width B = 1000 mm, the strip yield strength σ s = 600 MPa, the strip inlet tension T0 = 229 KN,

[0071] The strip outlet tension of each stand

[0072] T i = {T1, T2, T3, T4, T5, T6} = {379, 331, 295, 283, 250, 64} KN,

[0073] The strip outlet thickness of each stand

[0074] h i= {h1, h2, h3, h4, h5, h6} = {0.42, 0.42, 0.42, 0.45, 0.42, 0.45},

[0075] {2.921, 2.455, 2.109, 1.803, 1.619, 1.603} mm,

[0076] Critical value of slip factor on upper surface of each stand

[0077] ψ * si = {ψ * s1 , ψ * s2 , ψ * s3 , ψ * s4 , ψ * s5 , ψ * s6} = {0.42, 0.42, 0.42, 0.45, 0.42, 0.45},

[0078] {2.921, 2.455, 2.109, 1.803, 1.619, 1.603} mm,

[0079] Critical value of slip factor on lower surface of each stand

[0080] ψ * xi = {ψ * x1 , ψ * x2 , ψ * x3 , ψ * x4 , ψ * x5 , ψ * x6} = {0.32, 0.32, 0.32, 0.35, 0.32, 0.35} ;

[0081] {2.921, 2.455, 2.109, 1.803, 1.619, 1.603} mm,

[0082] (d) Collecting 5+1 type continuous cold rolling mill emulsion related parameters, including: the minimum value of emulsion concentration used by the mill c min = 2%, the minimum value of emulsion initial temperature used by the mill t min = 50℃;

[0083] (e) six-pass rolling mode emulsion tank combination selection: in the six-pass rolling mode, each stand is selected to correspond to one of the emulsion tanks A, B, and C, and the six-pass rolling mode emulsion tank can be combined in four ways, the first emulsion tank combination is A, A, A, B, A, C; the second emulsion tank combination is A, A, A, B, A, A; the third emulsion tank combination is A, A, A, A, A, C; and the fourth emulsion tank combination is A, A, A, A, A, A; wherein the emulsion tank A is a large-volume tank, and the emulsion tanks B and C are small-volume tanks;

[0084] (f) setting the related parameters in the emulsion tank optimization process, including: setting the emulsion concentration of the emulsion tank A as c A , the emulsion temperature of the emulsion tank A as t A , the emulsion concentration of the emulsion tank B as c B , the emulsion temperature of the emulsion tank B as t B , the emulsion concentration of the emulsion tank C as c C , the emulsion temperature of the emulsion tank C as t C , and the objective function of the six-pass rolling mode emulsion tank combination as G z (X z );

[0085] (g) setting the initial parameters k1, k2, k3, k4, k5, and k6 in the emulsion tank optimization process,

[0086] the step length of the given optimization is Δθ = 0.4;

[0087] (h) the emulsion concentration and emulsion temperature selection of the A, A, A, B, A, C tank combination, as shown in the following table: Figure 2

[0088] (h1) let k1 = 0 and k2 = 0;

[0089] (h2) let t A = t min + k2Δθ = 50℃;

[0090] (h3) calculating the rolling pressure P j , the rolling power N j , the strip upper surface slip factor ψ sj , the strip lower surface slip factor ψ xj , the strip upper surface thermal scratch index , and the strip lower surface thermal scratch index , wherein j = 1, 2, 3, and 5; ​​

[0091] P1 = 13152 KN, P2 = 12446 KN, P3 = 11852 KN, P5 = 10648 KN;

[0092] N1 = 2206 KW, N2 = 2636 KW, N3 = 2625 KW, N5 = 2126 KW;

[0093] ψ s1 = 0.32, ψ x1 = 0.19, ψ s2 = 0.33, ψ x2 = 0.21, ψ s3 = 0.38, ψ x3 = 0.25, ψ s5 = 0.39, ψ x5 = 0.26;

[0094]

[0095] (h4) judging P j ≤ η1P jmax , N j ≤ η2N jmax , ψ sj ≤ ψ * sj , ψ xj ≤ ψ * xj , is not true, then k1 = k 21 +1, k2 = k2+1, and the loop is turned to step (h2) and the cycle is started, wherein η1 = 0.9, η2 = 0.9; and the final output is:

[0096] c A = 2.9%, t A = 53.6°C;

[0097] P1 = 12932 KN, P2 = 12231 KN, P3 = 11543 KN, P5 = 10253 KN;

[0098] N1 = 2112 KW, N2 = 2524 KW, N3 = 2575 KW, N5 = 2032 KW;

[0099] ψ s1 = 0.24, ψ x1 = 0.16, ψ s2 = 0.25, ψ x2 = 0.18, ψ s3 = 0.3, ψ x3 = 0.19, ψ s5 = 0.31, ψx5 = 0.22;

[0100]

[0101] Let k1 = 0, k2 = 0, and go to step (h5);

[0102] (h5) Let k3 = 0, k4 = 0;

[0103] (h6) Let t B = t min + k4Δθ = 50°C;

[0104] (h7) Calculate rolling pressure P j , rolling power N j , strip upper surface slip factor ψ sj , strip lower surface slip factor ψ xj , strip upper surface thermal galling index strip lower surface thermal galling index where j = 4;

[0105] P4 = 9615 KN, N4 = 2863 KW, ψ s4 = 0.52, ψ x4 = 0.31,

[0106] (h8) Determine whether P j ≤ η1P jmax , N j ≤ η2N jmax , ψ sj ≤ ψ * sj , ψ xj ≤ ψ * xj , is not true, then k3 = k3 + 1, k4 = k4 + 1, and go to step (h6) to start the loop, where η1 = 0.9, η2 = 0.9; the final output is:

[0107] c B = 3%, t B = 54°C;

[0108] P4 = 9514 KN, N4 = 2794 KW, ψ s4 = 0.35, ψ x4 = 0.22,

[0109] Let k3 = 0, k4 = 0, and go to step (h9);

[0110] (h9) let k5 = 0, k6 = 0;

[0111] (h10) let t c = t min +k6Δθ = 50℃;

[0112] (h11) calculate the rolling pressure P j , rolling power N j , strip upper surface slip factor ψ sj , strip lower surface slip factor ψ xj , strip upper surface thermal scratch index strip lower surface thermal scratch index where j = 6;

[0113] P6 = 8500 KN, N6 = 2402 KW, ψ s6 = 0.35, ψ x6 = 0.27,

[0114] (h12) judge P j ≤ η1P jmax , N j ≤ η2N jmax , ψ sj ≤ ψ * sj , ψ xj ≤ ψ * xj , if k5 = 0, k6 = 0, go to step (i); where η1 = 0.9, η2 = 0.9;

[0115] (i) A, A, A, B, A, A tank combination of emulsion concentration and emulsion temperature selection, as shown in Figure 3 , the specific steps are as follows:

[0116] (i1) let t A = t min +k2Δθ = 50℃;

[0117] (i2) calculate the rolling pressure P j , rolling power N j , strip upper surface slip factor ψ sj , strip lower surface slip factor ψ xj , strip upper surface thermal scratch index strip lower surface thermal scratch index where j = 1, 2, 3, 5, 6;

[0118] P1 = 13152 KN, P2 = 12446 KN, P3 = 11852 KN, P5 =

[0119] 10648 KN, P6 = 8500 KN;

[0120] N1 = 2206 KW, N2 = 2636 KW, N3 = 2625 KW, N5 =

[0121] 2126 KW, N6 = 2402 KW;

[0122] ψ s1 = 0.32, ψ x1 = 0.19, ψ s2 = 0.33, ψ x2 = 0.21, ψ s3 = 0.38, ψ x3 =

[0123] 0.25, ψ s5 = 0.39, ψ x5 = 0.26, ψ s6 = 0.35, ψ x6 = 0.25;

[0124]

[0125] (i3) if P j ≤ η1P jmax , N j ≤ η2N jmax , ψ sj ≤ ψ * sj , ψ xj ≤ ψ * xj , is not true, then k1 = k1 + 1, k2 = k2 + 1, and go to step (il) to start the loop, wherein η1 = 0.9, η2 = 0.9; and finally output is:

[0126] c A = 2.8%, t A = 53.2°C;

[0127] P1 = 12874 KN, P2 = 12012 KN, P3 = 11431 KN, P5 =

[0128] 10257 KN, P6 = 8348 KN;

[0129] N1 = 2121 KW, N2 = 2541 KW, N3 = 2554 KW, N5 =

[0130] 2015KW, N6=2321KW;

[0131] ψ s1 = 0.24, ψ x1 = 0.16, ψ s2 = 0.25, ψ x2 = 0.18, ψ s3 = 0.3, ψ x3 =

[0132] 0.19, ψ s5 = 0.31, ψ x5 = 0.22, ψ s6 = 0.29, ψ x6 = 0.21;

[0133]

[0134] Let k1=0, k2=0, go to step (i4);

[0135] (i4) Let t B = t min +k4Δθ = 50°C;

[0136] (i5) Calculate rolling pressure P j , rolling power N j , strip upper surface slip factor ψ sj , strip lower surface slip factor ψ xj , strip upper surface thermal galling index strip lower surface thermal galling index where j=4;

[0137] P4=9615KN, N4=2863KW, ψ s4 = 0.52, ψ x4 = 0.31,

[0138]

[0139] (i6) Determine P j ≤ η1P jmax , N j ≤ η2N jmax , ψ sj ≤ ψ * sj , ψ xj ≤ ψ * xj , If not, then k3=k3+1, k4=k4+1, and go to step (i4) to start a loop, where η1=0.9, η2=0.9; the final output is:

[0140] c B = 3%, t B = 54°C;

[0141] P4= 9514 KN, N4= 2794 KW, ψ s4 = 0.35, ψ x4 = 0.22,

[0142]

[0143] and let k3=0, k4=0, go to step (j);

[0144] (j) The emulsion concentration and emulsion temperature selection of the oil tank combination is as shown in Table 1, and the specific steps are as follows: Figure 4

[0145] (j 1) Let t A = t min +k2Δθ= 50°C;

[0146] (j2) Calculate the rolling pressure P j , the rolling power N j , the strip upper surface slip factor ψ sj , the strip lower surface slip factor ψ xj , the strip upper surface thermal scratch index , and the strip lower surface thermal scratch index , where j=1, 2, 3, 4, 5;

[0147] P1= 13152 KN, P2= 12446 KN, P3= 11852 KN, P4=

[0148] 9615 KN, P5= 10648 KN;

[0149] N1= 2206 KW, N2= 2636 KW, N3= 2625 KW, N4=

[0150] 2863 KW, N5= 2126 KW;

[0151] ψ s1 = 0.32, ψ x1 = 0.19, ψ s2 = 0.33, ψ x2 = 0.21, ψ s3 = 0.38, ψ x3 =​

[0152] 0.25, ψ s4 = 0.52, ψ x4 = 0.31, ψ s5 = 0.39, ψ x5 = 0.26;

[0153]

[0154] (j3) judge P j ≤ η1P jmax , N j ≤ η2N jmax , ψ sj ≤ ψ * sj , ψ xj ≤ ψ * xj , is not true, then k1 = k1 + 1, k2 = k2 + 1, turn to step (j1) start loop, wherein, η1 = 0.9, η2 = 0.9; the final output is:

[0155] c A = 2.7%, t A = 52.8°C;

[0156] P1 = 12914 KN, P2 = 12221 KN, P3 = 11654 KN, P4 =

[0157] 9521 KN, P5 = 10517 KN;

[0158] N1 = 2131 KW, N2 = 2541 KW, N3 = 2531 KW, N4 =

[0159] 2742 KW, N5 = 2035 KW;

[0160] s1 = 0.24, ψ x1 = 0.16, ψ s2 = 0.25, ψ x2 = 0.18, ψ s3 = 0.3, ψ x3 =

[0161] 0.19, ψ s4 = 0.4, ψ x4 = 0.28, ψ s5 = 0.31, ψ x5 = 0.22;

[0162]

[0163] ​Let k1=0, k2=0, and go to step (j4);

[0164] (j4) Let t c =t min +k6Δθ=50℃;

[0165] (j5) Calculate rolling pressure P j , rolling power N j , strip upper surface slip factor ψ sj , strip lower surface slip factor ψ xj , strip upper surface thermal galling index strip lower surface thermal galling index where j=6;

[0166] P6=8500 KN, N6=2402 KW, ψ s6 =0.35, ψ x6 =0.27,

[0167]

[0168] (j6) Determine whether P j ≤η1P jmax , N j ≤η2N jmax , ψ sj ≤ψ * sj , ψ xj ≤ψ * xj , is true, then k5=0, k6=0, and go to step (k); where η1=0.9, η2=0.9;

[0169] (k) A, A, A, A, A, A tank combination emulsion concentration and emulsion temperature selection, as shown in Figure 5 , the specific steps are as follows:

[0170] (k1) Let t A =t min +k2Δθ=50℃;

[0171] (k2) Calculate rolling pressure P j , rolling power N j , strip upper surface slip factor ψ sj , strip lower surface slip factor ψ xj , strip upper surface thermal galling index strip lower surface thermal galling index wherein, j = 1, 2, 3, 4, 5, 6;

[0172] P1 = 13152 KN, P2 = 12446 KN, P3 = 11852 KN, P4 =

[0173] 9615 KN, P5 = 10648 KN, P6 = 8500 KN;

[0174] N1 = 2206 KW, N2 = 2636 KW, N3 = 2625 KW, N4 =

[0175] 2863 KW, N5 = 2126 KW, N6 = 2402 KW;

[0176] ψ s1 = 0.32, ψ x1 = 0.19, ψ s2 = 0.33, ψ x2 = 0.21, ψ s3 = 0.38, ψ x3 =

[0177] 0.25, ψ s4 = 0.52, ψ x4 = 0.31, ψ s5 = 0.39, ψ x5 = 0.26, ψ s6 = 0.35, ψ x6 = 0.25;

[0178]

[0179]

[0180] (k3) judge P j ≤ η1P jmax , N j ≤ η2N jmax , ψ sj ≤ ψ * sj , ψ xj ≤ ψ * xj , is not true, then k1 = k1 + 1, k2 = k2 + 1, and turn to step (k1) to start the loop, wherein η1 = 0.9, η2 = 0.9; the final output is:

[0181] c A = 3%, t A = 54°C;

[0182] P1 = 12841 KN, P2 = 12215 KN, P3 = 11641 KN, P4 = 9514 KN, P5 = 10412 KN, P6 = 8423 KN;

[0183] N1 = 2123 KW, N2 = 2541 KW, N3 = 2531 KW, N4 = 2756 KW, N5 = 2026 KW, N6 = 2314 KW;

[0184] Ψ s1 = 0.24, Ψ x1 = 0.16, Ψ s2 = 0.25, Ψ x2 = 0.18, Ψ s3 = 0.3, Ψ x3 = 0.19, Ψ s4 = 0.4, Ψ x4 = 0.28, Ψ s5 = 0.31, Ψ x5 = 0.22, Ψ s6 = 0.29, Ψ x6 = 0.21;

[0185]

[0186] (l) Calculate the target function G z (X z ) of the four emulsion oil tank combinations respectively, and the target function calculation formula is:

[0187]

[0188] Wherein, a s = 0.6, b s = 0.6, a x = 0.4, b x = 0.4, m sx = 0.5, n sx = 0.5;

[0189] Wherein, a s is the influence coefficient of the upper surface slip factor of the strip in the emulsion oil tank optimization process, b s is the influence coefficient of the upper surface thermal scratch index of the strip in the emulsion oil tank optimization process, a x is the influence coefficient of the lower surface slip factor of the strip in the emulsion oil tank optimization process, b x is the influence coefficient of the lower surface thermal scratch index of the strip in the emulsion oil tank optimization process, m sx is the slip difference adjustment coefficient under the six-pass rolling mode, n sx is the thermal scratch difference adjustment coefficient under the six-pass rolling mode;

[0190] Based on the above objective function calculation formula, the target functions of the four emulsion oil tank combinations are finally output as:

[0191] The target function G1(X1) of the oil tank combination A, A, A, B, A, C is 0.248;

[0192] The target function G2(X2) of the oil tank combination A, A, A, B, A, A is 0.33;

[0193] The target function G3(X3) of the oil tank combination A, A, A, A, A, C is 0.149;

[0194] The target function G4(X4) of the oil tank combination A, A, A, A, A, A is 0.231;

[0195] (m) Compare the target functions G z (X z ) of the four emulsion oil tank combinations, and output the emulsion oil tank combination corresponding to the maximum value of the target function in the order of A, A, A, B, A, A.

[0196] Example 2:

[0197] (a) The selected six stands are represented in turn by subscript i, i = 1, 2, 3, 4, 5, 6;

[0198] (b) Collect the basic equipment parameters of the 5+1 type cold continuous rolling mill train, including the work roll diameters of the conventional rolling mill and the fourth stand small roller diameter rolling mill

[0199] D wi ={D w1 ,D w2 ,D w3 ,D w4 ,D w5 ,D w6}=

[0200] {455, 455, 455, 360, 455, 455} mm,

[0201] Maximum allowable value of rolling force

[0202] P imax ={P 1max ,P 2max ,P 3max ,P 4max ,P 5max ,P 6max}=

[0203] {27000, 27000, 27000, 27000, 27000, 27000} KN,

[0204] Maximum rolling power allowable value

[0205] N imax = {N 1max , N 2max , N 3max , N 4max , N 5max , N 6max} = {N

[0206] {4200, 6000, 6000, 6400, 6000, 6000} KW;

[0207] (c) Collect rolling process parameters, including: strip entry thickness h0=3.525 mm, strip width B=1130 mm, strip yield strength σ s =600 MPa, strip entry tension T0=268 KN,

[0208] Strip exit tension of each stand

[0209] T i ={T1, T2, T3, T4, T5, T6}={439, 376, 340, 320, 276, 67} KN,

[0210] Strip exit thickness of each stand

[0211] h i ={h1, h2, h3, h4, h5, h6}=

[0212] {2.883, 2.381, 2.007, 1.719, 1.497, 1.483} mm,

[0213] Critical value of upper surface slip factor of strip of each stand

[0214] ψ * si ={ψ * s1 , ψ * s2 , ψ * s3 , ψ * s4 , ψ * s5 , ψ * s6}=

[0215] {0.42, 0.42, 0.42, 0.45, 0.42, 0.45},

[0216] Critical value of lower surface slip factor of strip of each stand

[0217] ψ * xi ={ψ * x1 ,ψ * x2 ,ψ * x3 ,ψ * x4 ,ψ * x5 ,ψ * x6}=

[0218] {0.32,0.32,0.32,0.35,0.32,0.35};

[0219] (d) Collect relevant parameters of the emulsion used in the 5+1 type cold rolling mill, including: the minimum concentration of the emulsion used in the mill, c. min =2%, minimum initial temperature t of the emulsion used by the unit. min =50℃;

[0220] (e) Selection of Emulsion Tank Combination in Six-Pass Rolling Mode: In the six-pass rolling mode, each stand is configured with one of the following emulsion tanks: A, B, and C. There are four possible combinations of emulsion tanks in the six-pass rolling mode: the first combination is: A, A, A, B, A, C; the second combination is: A, A, A, B, A, A; the third combination is: A, A, A, A, A, C; and the fourth combination is: A, A, A, A, A, A, A. Among them, emulsion tank A is a large-volume tank, while emulsion tanks B and C are small-volume tanks.

[0221] (f) Setting relevant parameters during the optimization process of the emulsion tank, including: setting the emulsion concentration of emulsion tank A to c. A The emulsion temperature in emulsion tank A is t. A The emulsion concentration in emulsion tank B is c. B The emulsion temperature in emulsion tank B is t. B The emulsion concentration in emulsion tank C is c. C The emulsion temperature in emulsion tank C is t. C The objective function for the six-pass rolling emulsion tank combination is G. z (X z );

[0222] (g) Set the initial parameters k1, k2, k3, k4, k5, k6 during the emulsion tank optimization process.

[0223] Given the optimization step size Δθ = 0.4;

[0224] (h) A, A, A, B, A, C tank combination emulsion concentration and emulsion temperature selection, as shown, the specific steps are as follows: Figure 2

[0225] (h1) let k1 = 0, k2 = 0;

[0226] (h2) let t A = t min +k2Δθ = 50℃;

[0227] (h3) calculate the rolling pressure P j , rolling power N j , strip upper surface slip factor ψ sj , strip lower surface slip factor ψ xj , strip upper surface thermal scratch index strip lower surface thermal scratch index Where, j = 1, 2, 3, 5;

[0228] P1 = 15194KN, P2 = 14408KN, P3 = 13773KN, P5 = 12168KN;

[0229] N1 = 2225KW, N2 = 2572KW, N3 = 2659KW, N5 = 2381KW;

[0230] ψ s1 = 0.34, ψ x1 = 0.21, ψ s2 = 0.35, ψ x2 = 0.23, ψ s3 = 0.4, ψ x3 =

[0231] 0.27, ψ s5 = 0.41, ψ x5 = 0.28;

[0232]

[0233] (h4) judge P j ≤η1P jmax ,N j ≤η2N jmax ,ψ sj ≤ψ * sj ,ψ xj ≤ψ * xj , ​If not, then k1=k1+1, k2=k2+1, and the process is transferred to step (h2) to start a loop, where η1=0.9, η2=0.9; and the final output is:

[0234] c A = 2.9%, t A = 53.6°C;

[0235] P1=14754 KN, P2=14102 KN, P3=13415 KN, P5=12001 KN;

[0236] N1=2164 KW, N2=2481 KW, N3=2584 KW, N5=2214 KW;

[0237] ψ s1 = 0.25, ψ x1 = 0.17, ψ s2 = 0.26, ψ x2 = 0.19, ψ s3 = 0.31, ψ x3 =

[0238] 0.2, ψ s5 = 0.32, ψ x5 = 0.23;

[0239]

[0240] Let k1=0, k2=0, and the process is transferred to step (h5);

[0241] (h5) Let k3=0, k4=0;

[0242] (h6) Let t B = t min +k4Δθ=50°C;

[0243] (h7) Calculate the rolling pressure P j , the rolling power N j , the strip upper surface slip factor ψ sj , the strip lower surface slip factor ψ xj , the strip upper surface thermal galling index the strip lower surface thermal galling index where j=4;

[0244] P4=10926 KN, N4=3329 KW, ψ s4 = 0.54, ψ x4 = 0.33,

[0245]

[0246] (h8) judge P j ≤ η1P jmax ,N j ≤ η2N jmax ,ψ sj ≤ ψ * sj ,ψ xj ≤ ψ * xj , is not true, then k3=k3+1, k4=k4+1, turn to step (h6) to start the loop, wherein η1=0.9, η2=0.9; the final output is:

[0247] c B =3%, t B =54℃;

[0248] P4=10572KN,N4=3177KW,ψ s4 =0.36,ψ x4 =0.23,

[0249]

[0250] and let k3=0, k4=0, turn to step (h9);

[0251] (h9) let k5=0, k6=0;

[0252] (h10) let t c =t min +k6Δθ=50℃;

[0253] (h11) calculate the rolling pressure P j , rolling power N j , the upper surface of the strip slip factor ψ sj , the lower surface of the strip slip factor ψ xj , the upper surface of the strip thermal scratch index the lower surface of the strip thermal scratch index wherein j=6;

[0254] P6=9605KN,N6=2043KW,ψ s6 =0.37,ψ x6 =0.27,

[0255]

[0256] (h12) judge P j ≤ η1Pjmax N j ≤η2N jmax ,ψ sj ≤ψ * sj ,ψ xj ≤ψ * xj , If true, then k5 = 0, k6 = 0, proceed to step (i); where η1 = 0.9, η2 = 0.9;

[0257] (i) Selection of emulsion concentration and emulsion temperature for the A, A, A, B, A, A oil tank combination, such as Figure 3 As shown, the specific steps are as follows:

[0258] (i1) Let t A =t min +k2Δθ=50℃;

[0259] (i2) Calculate the rolling pressure P j Rolling power N j Slip factor ψ on the upper surface of the strip sj Slip factor ψ on the lower surface of the strip xj Hot scratch index of the upper surface of strip steel Hot scratch index of lower surface of strip steel Where j = 1, 2, 3, 5, 6;

[0260] P1=15194KN, P2=14408KN, P3=13773KN, P5=

[0261] 12168 kN, P6 = 9605 kN;

[0262] N1=2225KW, N2=2572KW, N3=2659KW, N5=

[0263] 2381KW, N6 = 2043KW;

[0264] ψ s1 =0.34,ψ x1 =0.21,ψ s2 =0.35,ψ x2 =0.23,ψ s3 =0.4,ψ x3 =

[0265] 0.27,ψ s5 =0.41,ψ x5 =0.28,ψ s6 =0.37,ψ x6 =0.27;

[0266]

[0267] (i3) judge P j ≤ η1P jmax ,N j ≤ η2N jmax ,ψ sj ≤ ψ * sj ,ψ xj ≤ ψ * xj , is not true, then k1=k1+1, k2=k2+1, turn to step (i1) to start the loop, wherein η1=0.9, η2=0.9; the final output is:

[0268] c A =2.8%, t A =53.2℃;

[0269] P1=14941KN, P2=14116KN, P3=13451KN, P5=

[0270] 11854KN, P6=9514KN;

[0271] N1=2134KW, N2=2414KW, N3=2523KW, N5=

[0272] 2241KW, N6=1945KW;

[0273] ψ s1 =0.25, ψ x1 =0.17, ψ s2 =0.26, ψ x2 =0.19, ψ s3 =0.31, ψ x3 =

[0274] 0.2, ψ s5 =0.32, ψ x5 =0.23, ψ s6 =0.3, ψ x6 =0.22;

[0275]

[0276] and let k1=0, k2=0, turn to step (i4);

[0277] (i4) let t B =t min +k4Δθ=50℃;

[0278] (i5) calculating rolling pressure P j , rolling power N j , strip upper surface slip factor ψ sj , strip lower surface slip factor ψ xj , strip upper surface thermal galling index strip lower surface thermal galling index wherein j = 4;

[0279] P4 = 10926 KN, N4 = 3329 KW, ψ s4 = 0.54, ψ x4 = 0.33,

[0280]

[0281] (i6) judging P j ≤ η1P jmax , N j ≤ η2N jmax , ψ sj ≤ ψ * sj , ψ xj ≤ ψ * xj , is not true, then k3 = k3 + 1, k4 = k4 + 1, and the process goes to step (i4) to start a loop, wherein η1 = 0.9, η2 = 0.9; and the final output is:

[0282] c B = 3%, t B = 54℃;

[0283] P4 = 10572 KN, N4 = 3177 KW, ψ s4 = 0.36, ψ x4 = 0.23,

[0284]

[0285] and let k3 = 0, k4 = 0, and go to step (j);

[0286] (j) emulsion concentration and emulsion temperature selection for oil tank combination, as shown in Figure 4 , the specific steps are as follows:

[0287] (j1) let t A = t min + k2Δθ = 50℃;

[0288] (j2) calculating rolling pressure P j , rolling power N j , strip upper surface slip factor ψ sj , strip lower surface slip factor ψ xj , strip upper surface thermal galling index strip lower surface thermal galling index wherein j = 1, 2, 3, 4, 5;

[0289] P1 = 15194 KN, P2 = 14408 KN, P3 = 13773 KN, P4 = 10926 KN, P5 = 12168 KN;

[0290] P1 = 15194 KN, P2 = 14408 KN, P3 = 13773 KN, P4 = 10926 KN, P5 = 12168 KN;

[0291] N1 = 2225 KW, N2 = 2572 KW, N3 = 2659 KW, N4 = 3329 KW, N5 = 2381 KW;

[0292] N1 = 2225 KW, N2 = 2572 KW, N3 = 2659 KW, N4 = 3329 KW, N5 = 2381 KW;

[0293] ψ s1 = 0.34, ψ x1 = 0.21, ψ s2 = 0.35, ψ x2 = 0.23, ψ s3 = 0.4, ψ x3 =

[0294] ψ s4 = 0.54, ψ x4 = 0.33, ψ s5 = 0.41, ψ x5 = 0.28;

[0295]

[0296] (j3) judging P j ≤ η1P jmax , N j ≤ η2N jmax , ψ sj ≤ ψ * sj , ψ xj ≤ ψ * xj , , k1 = k1 + 1, k2 = k2 + 1, and returning to step (j1) to start the loop, wherein η1 = 0.9, η2 = 0.9; and finally outputting:

[0297] c A = 2.7%, t A = 52.8°C;

[0298] P1 = 14837 KN, P2 = 14252 KN, P3 = 13512 KN, P4 =

[0299] 10684 KN, P5 = 11973 KN;

[0300] N1 = 2125 KW, N2 = 2425 KW, N3 = 2554 KW, N4 =

[0301] 3126 KW, N5 = 2215 KW;

[0302] ψ s1 = 0.25, ψ x1 = 0.17, ψ s2 = 0.26, ψ x2 = 0.19, ψ s3 = 0.31, ψ x3 =

[0303] 0.2, ψ s4 = 0.41, ψ x4 = 0.29, ψ s5 = 0.32, ψ x5 = 0.23;

[0304]

[0305] Let k1 = 0, k2 = 0, and go to step (j4);

[0306] (j4) Let t c = t min + k6Δθ = 50°C;

[0307] (j5) Calculate rolling pressure P j , rolling power N j , strip upper surface slip factor ψ sj , strip lower surface slip factor ψ xj , strip upper surface thermal galling index strip lower surface thermal galling index where j = 6;

[0308] P6 = 9605 KN, N6 = 2043 KW, ψ s6 = 0.37, ψ x6 = 0.27,

[0309]

[0310] (j6) Determine P j ≤ η1P jmax , Nj ≤ η2N jmax , ψ sj ≤ ψ * sj , ψ xj ≤ ψ * xj , If k5 = 0, k6 = 0, turn to step (k); wherein, η1 = 0.9, η2 = 0.9;

[0311] (k) A, A, A, A, A, A tank combination emulsion concentration and emulsion temperature selection, as shown in Figure 5 , the specific steps are as follows:

[0312] (k1) Let t A = t min + k2Δθ = 50%;

[0313] (k2) Calculate the rolling pressure P j , rolling power N j , strip surface slip factor ψ sj , strip surface slip factor ψ xj , strip surface thermal slip index strip surface thermal slip index Wherein, j = 1, 2, 3, 4, 5, 6;

[0314] P1 = 15194KN, P2 = 14408KN, P3 = 13773KN, P4 =

[0315] 10926KN, P5 = 12168KN, P6 = 9605KN;

[0316] N1 = 2225KW, N2 = 2572KW, N3 = 2659KW, N4 =

[0317] 3329KW, N5 = 2381KW, N6 = 2043KW;

[0318] ψ s1 = 0.34, ψ x1 = 0.21, ψ s2 = 0.35, ψ x2 = 0.23, ψ s3 = 0.4, ψ x3 =

[0319] 0.27, ψ s4 = 0.54, ψ x4 = 0.33, ψ s5 = 0.41, ψ x5= 0.28, ψ s6 = 0.37, ψ x6 = 0.27;

[0320]

[0321] (k3) judge P j ≤ η1P jmax ,N j ≤ η2N jmax , ψ sj ≤ ψ * sj , ψ xj ≤ ψ * xj , is not true, then k1 = k1 + 1, k2 = k2 + 1, turn into step (k1) start loop, wherein, η1 = 0.9, η2 = 0.9; the final output is:

[0322] c A = 3%, t A = 54℃;

[0323] P1 = 14954KN, P2 = 14211KN, P3 = 13546KN, P4 =

[0324] 10588KN, P5 = 12021KN, P6 = 9568KN;

[0325] N1 = 2162KW, N2 = 2452KW, N3 = 2532KW, N4 =

[0326] 3142KW, N5 = 2245KW, N6 = 1952KW;

[0327] ψ s1 = 0.25, ψ x1 = 0.17, ψ s2 = 0.26, ψ x2 = 0.19, ψ s3 = 0.31, ψ x3 =

[0328] 0.2, ψ s4 = 0.41, ψ x4 = 0.29, ψ s5 = 0.32, ψ x5 = 0.23, ψ s6 = 0.3, ψ x6 = 0.22;

[0329]

[0330] (l) calculating the objective function G z (X z ) of the four emulsion oil tank combinations respectively, the objective function calculation formula is:

[0331]

[0332] Wherein, a s =0.6, b s =0.6, a x =0.4, b x =0.4, m sx =0.5, n sx =0.5;

[0333] Wherein, a s is the influence coefficient of the upper surface slip factor of the strip in the emulsion oil tank optimization process, b s is the influence coefficient of the upper surface thermal scratch index of the strip in the emulsion oil tank optimization process, a x is the influence coefficient of the lower surface slip factor of the strip in the emulsion oil tank optimization process, b x is the influence coefficient of the lower surface thermal scratch index of the strip in the emulsion oil tank optimization process, m sx is the slip difference adjustment coefficient under six pass rolling mode, n sx is the thermal scratch difference adjustment coefficient under six pass rolling mode;

[0334] Based on the above objective function calculation formula, the objective function of the four emulsion oil tank combinations is finally output as:

[0335] The objective function G1(X1) of the A, A, A, B, A, C oil tank combination is: 0.108;

[0336] The objective function G2(X2) of the A, A, A, B, A, A oil tank combination is: 0.21;

[0337] The objective function G3(X3) of the A, A, A, A, A, C oil tank combination is: 0.111;

[0338] The objective function G4(X4) of the A, A, A, A, A, A oil tank combination is: 0.009;

[0339] (m) comparing the objective functions G z (X z ) of the four emulsion oil tank combinations, the emulsion oil tank combination corresponding to the maximum value of the objective function is output as: A, A, A, B, A, A.

Claims

1. A method for optimizing the selection of emulsion oil tanks in a six-pass mode of a 5+1 type cold continuous rolling mill, wherein the 5+1 type cold continuous rolling mill includes 5 conventional rolling mills and a 4th stand small-diameter rolling mill, characterized in that: The method for optimizing the selection of emulsion tanks includes the following steps performed by a computer: (a) Represent the six selected racks sequentially with the subscript i, i = 1, 2, 3, 4, 5, 6; (b) Collect basic equipment parameters for the 5+1 type cold continuous rolling mill, including: the work roll diameter D of the conventional rolling mill and the 4th stand small diameter rolling mill. wi Maximum allowable rolling force P imax Maximum allowable rolling power N imax , where D wi ={D w1 D w2 D w3 D w4 D w5 D w6 }, P imax ={P 1max ,P 2max ,P 3max ,P 4max ,P 5max ,P 5max }, N imax ={N 1max ,N 2max ,N 3max ,N 4max ,N 5max ,N 6max }; (c) Collect rolling process parameters, including: strip entry thickness h0, strip width B, and strip yield strength σ. s Strip inlet tension T0, strip outlet tension T on each stand i The thickness h of the strip steel at the exit of each frame i The critical value of slippage factor ψ on the upper surface of the strip of each frame * si The critical value of slippage factor ψ on the lower surface of the strip of each frame * xi , among which, T i ={T1, T2, T3, T4, T5, T6}, h i ={h1, h2, h3, h4, h5, h6}, ψ * si ={ψ * s1 , ψ * s2 , ψ * s3 , ψ * s4 , ψ * s5 , ψ * s6 }, ψ * xi ={ψ * x1 , ψ * x2 , ψ * x3 , ψ * x4 , ψ * x5 , ψ * x6 }; (d) Collect relevant parameters of the emulsion used in the 5+1 type cold rolling mill, including: the minimum concentration of the emulsion used in the mill, c. min The minimum initial temperature t of the emulsion used by the unit min ; (e) Selection of Emulsion Tank Combination in Six-Pass Rolling Mode: In the six-pass rolling mode, each stand is configured with one of the following emulsion tanks: A, B, and C. There are four possible combinations of emulsion tanks in the six-pass rolling mode: the first combination is: A, A, A, B, A, C; the second combination is: A, A, A, B, A, A; the third combination is: A, A, A, A, A, C; and the fourth combination is: A, A, A, A, A, A, A. Among them, emulsion tank A is a large-volume tank, while emulsion tanks B and C are small-volume tanks. (f) Setting relevant parameters during the optimization process of the emulsion tank, including: setting the emulsion concentration of emulsion tank A to c. A The emulsion temperature in emulsion tank A is t. A The emulsion concentration in emulsion tank B is c. B The emulsion temperature in emulsion tank B is t. B The emulsion concentration in emulsion tank C is c. C The emulsion temperature in emulsion tank C is t. C The objective function for the six-pass rolling emulsion tank combination is G. z (X z ); (g) Set initial parameters k1, k2, k3, k4, k5, k6 during the emulsion tank optimization process, and specify the optimization step size. Δθ; The selection of emulsion concentration and emulsion temperature for the (h)A, A, A, B, A, C oil tank combination is as follows: (h1) Let k1 = 0, k2 = 0; (h2)Let t A = t min + k2Δθ; (h3) Calculate the rolling pressure P j Rolling power N j Slip factor ψ on the upper surface of the strip sj Slip factor ψ on the lower surface of the strip xj Hot scratch index of the upper surface of strip steel Hot scratch index of lower surface of strip steel Where j = 1, 2, 3, 5; (h4) Determine P j ≤η1P jmax N j ≤η2N jmax , ψ sj ≤ψ * sj , ψ xj ≤ψ * xj , Are all true? If true, then k1 = 0, k2 = 0, and proceed to step (h5); if false, then k1 = k1 + 1, k2 = k2 + 1, and proceed to step (h2); where η1 and η2 are both safety factors. (h5) Let k3 = 0, k4 = 0; (h6) Let t B = t min + k4Δθ; (h7) Calculate the rolling pressure P j Rolling power N j Slip factor ψ on the upper surface of the strip sj Slip factor ψ on the lower surface of the strip xj Hot scratch index of the upper surface of strip steel Hot scratch index of lower surface of strip steel Where j = 4; (h8) Determine P j ≤η1P jmax N j ≤η2N jmax , ψ sj ≤ψ * sj , ψ xj ≤ψ * xj , Are all true? If true, then k3 = 0, k4 = 0, and proceed to step (h9); if false, then k3 = k3 + 1, k4 = k4 + 1, and proceed to step (h6); where η1 and η2 are both safety factors. (h9) Let k5 = 0, k6 = 0; (h10) Let t c = t min + k6Δθ; (h11) Calculate the rolling pressure P j Rolling power N j Slip factor ψ on the upper surface of the strip sj Slip factor ψ on the lower surface of the strip xj Hot scratch index of the upper surface of strip steel Hot scratch index of lower surface of strip steel Where j = 6; (h12) Determine P j ≤η1P jmax N j ≤η2N jmax , ψ sj ≤ψ * sj , ψ xj ≤ψ * xj , Are all true? If true, then k5 = 0, k6 = 0, and proceed to step (i); if false, then k5 = k5 + 1, k6 = k6 + 1, and proceed to step (h10); where η1 and η2 are both safety factors. (i) The selection of emulsion concentration and emulsion temperature for the A, A, A, B, A, A oil tank combination is as follows: (i1) Let t A = t min + k2Δθ; (i2) Calculate the rolling pressure P j Rolling power N j Slip factor ψ on the upper surface of the strip sj Slip factor ψ on the lower surface of the strip xj Hot scratch index of the upper surface of strip steel Hot scratch index of lower surface of strip steel Where j = 1, 2, 3, 5, 6; (i3) Determine P j ≤η1P jmax N j ≤η2N jmax , ψ sj ≤ψ * sj , ψ xj ≤ψ * xj , Are all true? If true, then k1 = 0, k2 = 0, and proceed to step (i4); if false, then k1 = k1 + 1, k2 = k2 + 1, and proceed to step (i1); where η1 and η2 are both safety factors. (i4) Let t B = t min + k4Δθ; (i5) Calculate the rolling pressure P j Rolling power N j Slip factor ψ on the upper surface of the strip sj Slip factor ψ on the lower surface of the strip xj Hot scratch index of the upper surface of strip steel Hot scratch index of lower surface of strip steel Where j = 4; (i6) Determine P j ≤η1P jmax N j ≤η2N jmax , ψ sj ≤ψ * sj , ψ xj ≤ψ * xj , Are all true? If true, then k3 = 0, k4 = 0, and proceed to step (j); if false, then k3 = k3 + 1, k4 = k4 + 1, and proceed to step (i4); where η1 and η2 are both safety factors. (j) The selection of emulsion concentration and emulsion temperature for the combination of tanks A, A, A, A, A, C is as follows: (j1) Let t A = t min + k2Δθ; (j2) Calculate the rolling pressure P j Rolling power N j Slip factor ψ on the upper surface of the strip sj Slip factor ψ on the lower surface of the strip xj Hot scratch index of the upper surface of strip steel Hot scratch index of lower surface of strip steel Where j = 1, 2, 3, 4, 5; (j3) Determine P j ≤η1P jmax N j ≤η2N jmax , ψ sj ≤ψ * sj , ψ xj ≤ψ * xj , Are all true? If true, then k1 = 0, k2 = 0, and proceed to step (j4); if false, then k1 = k1 + 1, k2 = k2 + 1, and proceed to step (j1); where η1 and η2 are both safety factors. (j4) Let t c = t min + k6Δθ; (j5) Calculate the rolling pressure P j Rolling power N j Slip factor ψ on the upper surface of the strip sj Slip factor ψ on the lower surface of the strip xj Hot scratch index of the upper surface of strip steel Hot scratch index of lower surface of strip steel Where j = 6; (j6) Determine P j ≤η1P jmax N j ≤η2N jmax , ψ sj ≤ψ * sj , ψ xj ≤ψ * xj , Are all true? If true, then k5 = 0, k6 = 0, and proceed to step (k); if false, then k5 = k5 + 1, k6 = k6 + 1, and proceed to step (j4); where η1 and η2 are both safety factors. The selection of emulsion concentration and emulsion temperature for the (k)A, A, A, A, A tank combination is as follows: (k1) Let t A = t min + k2Δθ; (k2) Calculate the rolling pressure P j Rolling power N j Slip factor ψ on the upper surface of the strip sj Slip factor ψ on the lower surface of the strip xj Hot scratch index of the upper surface of strip steel Hot scratch index of lower surface of strip steel Where j = 1, 2, 3, 4, 5, 6; (k3) Determine P j ≤η1P jmax N j ≤η2N jmax , ψ sj ≤ψ * sj , ψ xj ≤ψ * xj , Whether both are true; if true, then k1 = 0, k2 = 0, and proceed to step (1); if not true, then k1 = k1 + 1, k2 = k2 + 1, and proceed to step (k1); where η1 and η2 are both safety factors; (l) Calculate the objective function G for the four emulsion tank combinations respectively. z (X z The objective function is calculated using the following formula: Among them, a s b is the influence coefficient of the slippage factor on the upper surface of the strip steel during the optimization process of the emulsion tank. s a is the influence coefficient of the hot scratch index on the upper surface of the strip steel during the optimization process of the emulsion oil tank. x b is the influence coefficient of the slippage factor on the lower surface of the strip steel during the optimization process of the emulsion tank. x The influence coefficient of the hot scratch index on the lower surface of the strip steel during the optimization process of the emulsion oil tank is m. sx n is the slippage difference adjustment coefficient in the six-pass rolling mode. sx The adjustment coefficient for hot slip difference under the six-pass rolling mode; (m) Compare the objective function G of the four emulsion tank combinations z (X z Output the emulsion tank combination sorting corresponding to the maximum value of the objective function.

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