CN104785540A - Rolling efficiency improvement method suitable for five-stand cold continuous rolling units - Google Patents

Abstract

The invention relates to a control device or method special for metal rolling mills or machined products of the metal rolling mills, in particular to a rolling efficiency improvement method suitable for five-stand cold continuous rolling units. According to existing device parameter and technological parameter data of a cold continuous rolling unit control system and steel types and specification characteristic parameters of products for expansion, the rolling pressure and the rolling power are calculated, and then synthetic judgment is carried out according to the permission safety factors of the units; on the premise of guaranteeing the safety margin of rolling production, by optimally distributing the rolling reduction and the outlet tension of each stand, the limit rolling speed of the units is increased to the maximum degree under the specific technological lubrication system, the maximum rolling speed is searched and regarded as a control parameter, and the rolling speed of limit specification products is increased; on the condition without increasing the equipment investment, the range of the limit specification products of the cold continuous rolling units can be expanded, and the capacity and the production efficiency of the cold continuous rolling units can be improved.

Description

A kind of rolling efficiency method for improving being suitable for five Stands Cold Tandem Mill groups

Technical field

The present invention relates to the control appliance or method that are specially adapted for rolling mill for metal or its converted products, particularly relate to a kind of rolling efficiency method for improving controlled for the five Stands Cold Tandem Mill group operations of rolling.

Background technology

Concerning cold continuous rolling production line, when the market orientation of unit and product mix change, need to adjust the production capacity of unit.And the accounting laying particular emphasis on pressure ability is compared for the accounting of production capacity in scene, determining whether can rolling, can the thickness limit of rolling.And seldom consider the problem of mill speed.Chinese invention patent application " setting device of a kind of cold continuous rolling each frame drafts and mill speed and method " (application number: 201310193184.3 application publication numbers: CN103272853A) discloses the setting device of each frame drafts of a kind of cold continuous rolling and mill speed, comprising: initial depression rate generator, power equilibrium calculation device, energy consumption calculation device, about beam generator, coarse adjustment renovator, constraint non-dominated ranking device, accurate adjustment renovator, reduction ratio selector, reduction ratio renovator screening washer and final drafts and mill speed generator.The device and method of this invention can calculate drafts and the mill speed of each frame of rolling different size band steel when empirical data lacks, under the prerequisite ensureing each frame balancing the load, reduce required power to greatest extent.For on-the-spot, efficiency is most important, if through the accounting of pressure ability, unit can roll a certain thickness limit, but do not reach the mill speed of requirement, still can not illustrate that unit possesses the ability of producing this thickness product, like this in the process of product specification expansion, under the prerequisite of thickness that pursues a goal, the production efficiency how promoting unit just becomes the focus of site technology tackling key problem.

Summary of the invention

The object of this invention is to provide a kind of rolling efficiency method for improving being suitable for five Stands Cold Tandem Mill groups, can fully in conjunction with the equipment and technology feature of five Stands Cold Tandem Mill groups, by the complex optimum to rolling procedure, the steel grade of different intensity grades can be provided under a certain specific technological lubrication system, for the maximum mill speed of specific milling train, thus farthest improve the mill speed intending expanding specification strip steel, ensure rolling efficiency, for enterprise creates economic benefit.

The present invention solves the problems of the technologies described above adopted technical scheme:

Be suitable for a rolling efficiency method for improving for five Stands Cold Tandem Mill groups, for the roll control system of five Stands Cold Tandem Mill groups, it is characterized in that described rolling efficiency method for improving comprises the following steps:

S01: device parameter and the technological parameter of collecting five Stands Cold Tandem Mill groups, comprising: the working roll roller footpath D of frame 1-5 _iw, frame 1-5 milling train maximum draught pressure setting value P allowable _imax, frame 1-5 milling train maximum rolling power setting value F allowable _imax, uncoiler uncoiling tension T ₀, frame 1-4 milling train exports tension force maximum of T allowable _imax, frame 1-4 milling train exports tension force minimum of a value T allowable _imin, crimping machine curl tension T ₅, unit security admission coefficient η, η=0.85-0.95; The minimum of a value λ of distortion proportion in the distortion that institute's organic frame is total of frame i during unit rolling specific standard band _imin, the maximum λ of distortion proportion in the distortion that institute's organic frame is total of frame i during unit rolling specific standard band _imax, in the unit operation of rolling, permit minimum mill speed V ₀, wherein, i is corresponding shelf number, unit security admission coefficient η=0.85-0.95;

S02: given plan expands steel grade and the specification characteristic parameter of product, comprises the initial strength σ of band _s0, strain hardening coefficient k _s, the width B of band, the thickness h of supplied materials ₀, intend the target thickness h expanding specification product ₅;

S03: collect main technique lubricating regime parameter, comprise the flow flow of 1-5# frame emulsion _i, the initial temperature T of emulsion _wd, the concentration C of emulsion;

S04: the procedure parameter that definition rolling efficiency is involved in promoting and calculating, comprising: distortion proportion λ in the distortion that institute's organic frame is total of frame i _i, distortion step-size in search Δ λ, frame 1-4 exports tension force T _i, tension force step-size in search Δ T, the reduction ratio ε of tandem mills frame i _i, the search value V of maximum mill speed _max0, maximal rate search parameter s; The reduction ratio ε of frame 1-5 _i, the exit thickness h of frame 1-4 _i, the outlet mill speed v of frame 1-4 _i, and the draught pressure P of frame 1-5 _iwith rolling power F _i;

S05: the original allocation value λ of given frame 1 drafts ₁=λ _1min, outlet tension force initial value T ₁=T _1min, the original allocation value λ of frame 2 drafts ₂=λ _2min, outlet tension force initial value T ₂=T _2min, the original allocation value λ of frame 3 drafts ₃=λ _3min, outlet tension force initial value T ₃=T _3min, the original allocation value λ of frame 4 drafts ₄=λ _4min, outlet tension force initial value T ₄=T _4min;

S06: the original allocation value λ calculating frame 5 drafts ₅=1-λ ₁-λ ₂-λ ₃-λ ₄;

S07: make maximal rate search parameter s=0;

S08: the search value V calculating maximum mill speed _max0=V ₀+ 0.5s;

S10: calculate draught pressure and rolling power according to the device parameter of unit and technological parameter, and utilize unit security admission coefficient η to carry out comprehensive descision, ensures the safe clearance of Rolling Production, wherein, and unit security admission coefficient η=0.85-0.95;

S21: make s=s+1, proceeds to step S08;

S22: judge inequality V _max0-0.5 > V ₀set up? if inequality is set up, then make V ₀=V _max0-0.5, proceed to step S05; Until inequality is false, proceed to step S23;

S23: judge inequality $\left\{\begin{array}{c}{\mathrm{\&lambda;}}_i<{\mathrm{\&lambda;}}_{i\max }\\ T_i<\mathrm{\&eta;}{T}_{i\max }\end{array}\right.$ Set up? if inequality is set up, then proceed to step S06, increase a step-size in search, redistribute deformation distribution ratio and outlet tension value; Until inequality is false, proceed to step S24;

S24: will the maximum mill speed V obtained be searched for _max0=V _max0-0.5 as controling parameters, sends the roll control system of five Stands Cold Tandem Mill groups to.

The preferred technical scheme of one being suitable for the rolling efficiency method for improving of five Stands Cold Tandem Mill groups of the present invention, is characterized in that described step S10 comprises the following steps:

S11: according to original depth H ₀, finished product thickness h ₀with the reduction distribution value λ of frame 1-5 _i, calculate reduction ratio and the exit thickness of each frame, wherein the computation model of reduction ratio is:

$\left\{\begin{array}{c}{\mathrm{\&epsiv;}}_1=\frac{(h_0-h_5)}{h_0}{\mathrm{\&lambda;}}_1\\ {\mathrm{\&epsiv;}}_2=\frac{(h_0-h_5)}{h_0-(h_0-h_5){\mathrm{\&lambda;}}_1}{\mathrm{\&lambda;}}_2\\ {\mathrm{\&epsiv;}}_3=\frac{(h_0-h_5)}{h_0-(h_0-h_5)({\mathrm{\&lambda;}}_1+{\mathrm{\&lambda;}}_2)}{\mathrm{\&lambda;}}_3\\ {\mathrm{\&epsiv;}}_4=\frac{(h_0-h_5)}{h_0-(h_0-h_5)({\mathrm{\&lambda;}}_1+{\mathrm{\&lambda;}}_2+{\mathrm{\&lambda;}}_3)}{\mathrm{\&lambda;}}_4\\ {\mathrm{\&epsiv;}}_5=\frac{(h_0-h_5)}{h_0-(h_0-h_5)({\mathrm{\&lambda;}}_1+{\mathrm{\&lambda;}}_2+{\mathrm{\&lambda;}}_3+{\mathrm{\&lambda;}}_4)}{\mathrm{\&lambda;}}_5\end{array}\right.,$

Each rack outlet thickness machine modeling type is: h _i=h _i-1(1-ε _i);

In various above, i is corresponding shelf number.

S12: the principle equal according to second flow, the outlet mill speed of computer rack 1-4

S13: with entrance tension force T _i-1, outlet tension force T _i, reduction ratio ε _i, initial strength σ _s0, strain hardening coefficient is k _s, mill speed is v _i, the width B of band, inlet thickness be h _i-1with exit thickness h _ifor primary condition, calculate each frame at current process lubricating regime, the draught pressure P under rolling procedure state _iwith rolling power F _i;

S14: judge inequality $\left\{\begin{array}{c}{P}_i<{\mathrm{\&eta;P}}_{i\max }\\ F_i<\mathrm{\&eta;}{F}_{i\max }\end{array}\right.$ Set up? if inequality is set up, then proceed to step S21; If inequality is false, proceed to step S22.

The invention has the beneficial effects as follows:

1. the rolling efficiency method for improving being suitable for five Stands Cold Tandem Mill groups of the present invention, by distributing the optimization of drafts and each rack outlet tension force, improve unit to greatest extent under specific technological lubrication system, the limit mill speed that can reach, greatly can improve the mill speed of Limit specifications product, for the expansion of tandem mills Limit specifications product lays the foundation.

2. the rolling efficiency method for improving being suitable for five Stands Cold Tandem Mill groups of the present invention, use the existing device parameter of cold continuous rolling set control system and technological parameter data, the maximum stable mill speed of unit is controlled by computer program, realize the rolling efficiency promoting tandem mills, can when not increasing equipment investment, improve the production capacity of band steel Limit specifications product, enhance productivity, thus bring larger economic benefit to enterprise.

Accompanying drawing explanation

Fig. 1 is the control flow chart that the present invention is suitable for the rolling efficiency method for improving of five Stands Cold Tandem Mill groups;

Fig. 2 is the calculating of draught pressure and rolling power and the control flow chart of verification procedure.

Detailed description of the invention

In order to technique scheme of the present invention can be understood better, describe in detail further below in conjunction with drawings and Examples.

Fig. 1 is the embodiment being suitable for the rolling efficiency method for improving of five Stands Cold Tandem Mill groups of the present invention, in order to the application process of correlation technique of the present invention is described, now for certain 1,420 five Stands Cold Tandem Mill group, introduce the computational process that certain 1,420 five Stands Cold Tandem Mill group rolling efficiency promotes in detail:

Embodiment 1

The present embodiment for supplied materials steel grade be MRT-5CA, the supplied materials specification band steel that is 2.01mm × 935mm, the application process of correlation technique of the present invention is described.

In step S01, collect the equipment and technology parameter of five Stands Cold Tandem Mill groups, comprising:

The working roll roller footpath D of frame 1-5 _iw=482.89,486.32,459.24,386.21,394.5}mm,

Frame 1-5 milling train maximum draught pressure setting value P allowable _imax=1800,1800,1800,1800,1800}t,

Frame 1-5 milling train maximum rolling power setting value F allowable _imax=2680,4000,4000,4000,4000}kw,

Uncoiler uncoiling tension T ₀=70MPa,

Frame 1-4 milling train exports tension force maximum of T allowable _imax=250MPa,

Frame 1-4 milling train exports tension force minimum of a value T allowable _imin=80MPa,

Crimping machine curl tension T ₅=60MPa,

Unit security admission coefficient η=0.9,

The minimum of a value λ of distortion proportion in the distortion that institute's organic frame is total of frame i during unit rolling specific standard band _imin=0.2,0.2,0.1,0.1,0.05},

The maximum λ of distortion proportion in the distortion that institute's organic frame is total of frame i during unit rolling specific standard band _imax=0.6,0.45,0.4,0.3,0.2},

Minimum mill speed V is permitted in the unit operation of rolling ₀=450m/min;

In various above, i is corresponding shelf number.

In step S02, given steel grade and the specification characteristic parameter intending expansion product, comprising:

The initial strength σ of band _s0=420MPa,

Strain hardening coefficient k _s=1.2,

Width B=the 935mm of band,

The thickness h of supplied materials ₀=2.0mm,

Intend the target thickness h expanding specification product ₅=0.17mm;

In step S03, collect main technique lubricating regime parameter, comprising:

The flow flow of frame 1-5 emulsion _i=1010,1250,1100,950,1200}L/min,

The initial temperature temperature T of emulsion _wd=58 DEG C,

Concentration C=4.2% of emulsion;

In step S04, the procedure parameter that definition rolling efficiency is involved in promoting and calculating, comprising:

Distortion proportion λ in the distortion that institute's organic frame is total of frame i _i,

Distortion step-size in search Δ λ=0.01,

Frame 1-4 exports tension force T _i,

Tension force step-size in search Δ T=5MPa,

The reduction ratio ε of tandem mills frame i _i,

The search value V of maximum mill speed _max0,

Maximal rate search parameter s,

The reduction ratio ε of frame 1-5 _i,

The exit thickness h of frame 1-4 _i,

The outlet mill speed v of frame 1-4 _i,

The draught pressure P of frame 1-5 _iwith rolling power F _i;

Consider in on-the-spot actual production, band is when each frame rolling, and the ratio of its deformation distribution should exceed the least amount of deformation distribution ratio λ that this frame relevant device allows _imin, the outlet tension force of frame 1-4 should be greater than the minimum tension License Value T that each frame relevant device allows _imin, so in the step S05 of the present embodiment, each process variable initialize is as follows:

The original allocation value λ of frame 1 drafts ₁=λ _1min=0.2, outlet tension force initial value T ₁=T _1min=80MPa,

The original allocation value λ of frame 2 drafts ₂=λ _2min=0.2, outlet tension force initial value T ₂=T _2min=80MPa,

The original allocation value λ of frame 3 drafts ₃=λ _3min=0.1, outlet tension force initial value T ₃=T _3min=80MPa,

The original allocation value λ of frame 4 drafts ₄=λ _4min=0.1, outlet tension force initial value T ₄=T _4min=80MPa;

In step S06, calculate the original allocation value λ of frame 5 drafts ₅=1-λ ₁-λ ₂-λ ₃-λ ₄=0.4;

In step S07, make maximal rate search parameter s=0;

In step S08, calculate the search value V of maximum mill speed _max0=V ₀+ 0.5s=450m/min;

Step S10 calculates draught pressure and rolling power according to the device parameter of unit and technological parameter, and utilize unit security admission coefficient η to carry out comprehensive descision, ensure the safe clearance of Rolling Production, its basic procedure as shown in Figure 2, comprises the following steps S11 to S14:

In step s 11, according to original depth H ₀, finished product thickness h ₀with the reduction distribution value λ of frame 1-5 _i, calculate:

The reduction ratio ε of each frame _i=(0.183,0.225,0.146,0.170,0.82),

The exit thickness h of frame 1-4 _i=(1.632,1.264,1.08,0.8896) mm;

In various above, i is corresponding shelf number.

In step s 12, the principle equal according to second flow, calculates:

The outlet mill speed v of frame 1-4 _i=(44.12,56.96,66.67,80.36) m/min;

In step s 13, with entrance tension force T _i-1, outlet tension force T _i, reduction ratio ε _i, initial strength σ _s0, strain hardening coefficient is k _s, mill speed is v _i, the width B of band, inlet thickness be h _i-1, exit thickness is h _ifor primary condition, calculate the draught pressure P of each frame in current process lubricating regime, rolling procedure situation _iwith rolling power F _i:

P _i=(683.24,694.96,595.75,599.16,9832.49)t，

F _i=(173.02,249.19,167.15,200.85,6983.98)Kw；

Consider that on-the-spot tension force also exists certain fluctuation, draught pressure and rolling power should ensure certain safe clearance, therefore, in step S14, judge inequality $\left\{\begin{array}{c}{P}_i<{\mathrm{\&eta;P}}_{i\max }\\ F_i<\mathrm{\&eta;}{F}_{i\max }\end{array}\right.$ Set up?

In this embodiment, obvious inequality is false, and proceeds to step S22;

In the step s 21, make s=s+1, proceed to step S08;

In step S22, judge inequality V _max0-0.5 > V ₀set up? the obvious inequality of original state is set up, then make V ₀=V _max0-0.5, proceed to step S05; Until inequality is false, proceed to step S23;

Consider the fluctuation situation of tension force, in step S23, judge inequality $\left\{\begin{array}{c}{\mathrm{\&lambda;}}_i<{\mathrm{\&lambda;}}_{i\max }\\ T_i<\mathrm{\&eta;}{T}_{i\max }\end{array}\right.$ Set up? in formula, λ _iand T _ifor the array of the corresponding each shelf number i of difference.

The obvious inequality of original state is set up, then increase a step-size in search, redistributes deflection and outlet tension value, proceeds to step S06; Until inequality is false, proceed to step S24;

Finally, in step s 24 which, the maximum mill speed V obtained will be searched for _max0=V _max0-0.5=935.5m/min, as controling parameters, sends the roll control system of five Stands Cold Tandem Mill groups to, realizes the lifting of unit rolling efficiency.

Can be found out by this embodiment, after optimizing, the maximum stable mill speed of unit to this specification product can reach 935.5m/min, and unit is before use correlation technique of the present invention, actual largest production speed is only about 800m/min, maximum mill speed improves 16.94%, illustrate that correlation computations of the present invention can be good at improving the production efficiency of unit, bring economic benefit to scene.

Embodiment 2

The present embodiment for supplied materials steel grade be MRT-4CA, the supplied materials specification band steel that is 2.01mm × 812mm, the application process of correlation technique of the present invention is described.

In step S01, collect the equipment and technology parameter of five Stands Cold Tandem Mill groups, comprising:

The working roll roller footpath D of frame 1-5 _iw=468.06,479.48,490.72,398.32,402.35}mm,

Frame 1-5 milling train maximum draught pressure setting value P allowable _imax=1800,1800,1800,1800,1800}t,

Frame 1-5 milling train maximum rolling power setting value F allowable _imax={ 2680,4000,4000,4000,4000}kw

Uncoiler uncoiling tension T ₀=70MPa,

Frame 1-4 milling train exports tension force maximum of T allowable _imax=250MPa,

Frame 1-4 milling train exports tension force minimum of a value T allowable _imin=80MPa,

Crimping machine curl tension T ₅=60MPa,

Unit security admission coefficient η=0.9,

The minimum of a value λ of distortion proportion in the distortion that institute's organic frame is total of frame i during unit rolling specific standard band _imin=0.25,0.2,0.15,0.1,0.1},

The maximum λ of distortion proportion in the distortion that institute's organic frame is total of frame i during unit rolling specific standard band _imax=0.6,0.45,0.4,0.3,0.2},

Minimum mill speed V is permitted in the unit operation of rolling ₀=520m/min;

In various above, i is corresponding shelf number.

In step S02, given steel grade and the specification characteristic parameter intending expansion product, comprising:

The initial strength σ of band _s0=380MPa,

Strain hardening coefficient k _s=1.2,

Width B=the 812mm of band,

The thickness h of supplied materials ₀=2.0mm,

Intend the target thickness h expanding specification product ₅=0.17mm;

In step S03, collect main technique lubricating regime parameter, comprising:

The flow flow of 1-5# frame emulsion _i=1050,1120,1210,1080,1130}L/min,

The initial temperature temperature T of emulsion _wd=58 DEG C,

Concentration C=4.2% of emulsion;

In step S04, the procedure parameter that definition rolling efficiency is involved in promoting and calculating, comprising:

Distortion proportion λ in the distortion that institute's organic frame is total of frame i _i,

Distortion step-size in search Δ λ=0.01,

Frame 1-4 exports tension force T _i,

Tension force step-size in search Δ T=5MPa,

The reduction ratio ε of tandem mills frame i _i,

The search value V of maximum mill speed _max0,

Maximal rate search parameter s,

The reduction ratio ε of frame 1-5 _i,

The exit thickness h of frame 1-4 _i,

The outlet mill speed v of frame 1-4 _i,

The draught pressure P of frame 1-5 _iwith rolling power F _i;

Consider in on-the-spot actual production, band is when each frame rolling, and the ratio of its deformation distribution should exceed the least amount of deformation distribution ratio λ that this frame relevant device allows _imin, the outlet tension force of frame 1-4 should be greater than the minimum tension License Value T that each frame relevant device allows _imin, so in the step S05 of the present embodiment, each process variable initialize is as follows:

The original allocation value λ of frame 1 drafts ₁=λ _1min=0.25, outlet tension force initial value T ₁=T _1min=80MPa,

The original allocation value λ of frame 2 drafts ₂=λ _2min=0.2, outlet tension force initial value T ₂=T _2min=80MPa,

The original allocation value λ of frame 3 drafts ₃=λ _3min=0.15, outlet tension force initial value T ₃=T _3min=80MPa,

The original allocation value λ of frame 4 drafts ₄=λ _4min=0.1, tension force initial value T is exported ₄=T _4min=80MPa;

In step S06, calculate the original allocation value λ of frame 5 drafts ₅=1-λ ₁-λ ₂-λ ₃-λ ₄=0.3;

In step S07, make maximal rate search parameter s=0;

In step S08, calculate the search value V of maximum mill speed _max0=V ₀+ 0.5s=520m/min;

Step S10 calculates draught pressure and rolling power according to the device parameter of unit and technological parameter, and utilize unit security admission coefficient η to carry out comprehensive descision, ensure the safe clearance of Rolling Production, its basic procedure as shown in Figure 2, comprises the following steps S11 to S14:

In step s 11, according to original depth H ₀, finished product thickness h ₀with the reduction distribution value λ of frame 1-5 _i, calculate:

The reduction ratio ε of each frame _i=(0.229,0.237,0.234,0.203,0.765),

The exit thickness h of frame 1-4 _i=(1.55,1,182,0.906,0.722,0.17) mm;

In various above, i is corresponding shelf number.

In step s 12, the principle equal according to second flow, calculates:

The outlet mill speed v of frame 1-4 _i=(57.03,74.79,95.57,122.44) m/min;

In step s 13, with entrance tension force T _i-1, outlet tension force T _i, reduction ratio ε _i, initial strength σ _s0, strain hardening coefficient is k _s, mill speed is v _i, the width B of band, inlet thickness be h _i-1with exit thickness h _ifor primary condition, calculate the draught pressure P of each frame in current process lubricating regime, rolling procedure situation _iwith rolling power F _i:

P _i=(618.36,611.87,510.64,450.70,6756.41)t，

F _i=(231.56,283.69,286.68,243.2,6576.44)Kw；

Consider that on-the-spot tension force also exists certain fluctuation, draught pressure and rolling power should ensure certain safe clearance, therefore, in step S14, judge inequality $\left\{\begin{array}{c}{P}_i<{\mathrm{\&eta;P}}_{i\max }\\ F_i<\mathrm{\&eta;}{F}_{i\max }\end{array}\right.$ Set up?

In this embodiment, obvious inequality is false, and proceeds to step S22;

In the step s 21, make s=s+1, proceed to step S08;

In step S22, judge inequality V _max0-0.5 > V ₀set up? the obvious inequality of original state is set up, then make V ₀=V _max0-0.5, proceed to step S05; Until inequality is false, proceed to step S23;

Consider the fluctuation situation of tension force, in step S23, judge inequality $\left\{\begin{array}{c}{\mathrm{\&lambda;}}_i<{\mathrm{\&lambda;}}_{i\max }\\ T_i<\mathrm{\&eta;}{T}_{i\max }\end{array}\right.$ Set up? in formula, λ _iand T _ifor the array of the corresponding each shelf number i of difference.

The obvious inequality of original state is set up, then increase a step-size in search, redistributes deflection and outlet tension value, proceeds to step S06; Until inequality is false, proceed to step S24;

Finally, in step s 24 which, the maximum mill speed V obtained will be searched for _max0=V _max0-0.5=896m/min, as controling parameters, sends the roll control system of five Stands Cold Tandem Mill groups to, realizes the lifting of unit rolling efficiency.

Can be found out by this embodiment, after optimizing, the maximum stable mill speed of unit to this specification product can reach 896m/min, and unit is before use correlation technique of the present invention, actual largest production speed is only about 780m/min, maximum mill speed improves 14.87%, illustrate that correlation computations of the present invention can be good at improving the production efficiency of unit, bring economic benefit to scene.

Those of ordinary skill in the art will be appreciated that; above embodiment is only used to technical scheme of the present invention is described; and be not used as limitation of the invention; any the above embodiment is done based on connotation of the present invention change, modification, all will drop in the protection domain of claim of the present invention.

Claims (2)

1. be suitable for a rolling efficiency method for improving for five Stands Cold Tandem Mill groups, for the roll control system of five Stands Cold Tandem Mill groups, it is characterized in that described rolling efficiency method for improving comprises the following steps:

S01: device parameter and the technological parameter of collecting five Stands Cold Tandem Mill groups, comprising: the working roll roller footpath D of frame 1-5 _iw, frame 1-5 milling train maximum draught pressure setting value P allowable _imax, frame 1-5 milling train maximum rolling power setting value F allowable _imax, uncoiler uncoiling tension T ₀, frame 1-4 milling train exports tension force maximum of T allowable _imax, frame 1-4 milling train exports tension force minimum of a value T allowable _imin, crimping machine curl tension T ₅, unit security admission coefficient η; The minimum of a value λ of distortion proportion in the distortion that institute's organic frame is total of frame i during unit rolling specific standard band _imin, the maximum λ of distortion proportion in the distortion that institute's organic frame is total of frame i during unit rolling specific standard band _imax, in the unit operation of rolling, permit minimum mill speed V ₀, wherein, i is corresponding shelf number;

S02: given plan expands steel grade and the specification characteristic parameter of product, comprises the initial strength σ of band _s0, strain hardening coefficient k _s, the width B of band, the thickness h of supplied materials ₀, intend the target thickness h expanding specification product ₅;

S03: collect main technique lubricating regime parameter, comprise the flow flow of 1-5# frame emulsion _i, the initial temperature T of emulsion _wd, the concentration C of emulsion;

S04: the procedure parameter that definition rolling efficiency is involved in promoting and calculating, comprising: distortion proportion λ in the distortion that institute's organic frame is total of frame i _i, distortion step-size in search Δ λ, frame 1-4 exports tension force T _i, tension force step-size in search Δ T, the reduction ratio ε of tandem mills frame i _i, the search value V of maximum mill speed _max0, the reduction ratio ε of maximal rate search parameter s, frame 1-5 _i, the exit thickness h of frame 1-4 _i, the outlet mill speed v of frame 1-4 _i, and the draught pressure P of frame 1-5 _iwith rolling power F _i;

S05: the original allocation value λ of given frame 1 drafts ₁=λ _1min, outlet tension force initial value T ₁=T _1min, the original allocation value λ of frame 2 drafts ₂=λ _2min, outlet tension force initial value T ₂=T _2min, the original allocation value λ of frame 3 drafts ₃=λ _3min, outlet tension force initial value T ₃=T _3min, the original allocation value λ of frame 4 drafts ₄=λ _4min, outlet tension force initial value T ₄=T _4min;

S06: the original allocation value λ calculating frame 5 drafts ₅=1-λ ₁-λ ₂-λ ₃-λ ₄;

S07: make maximal rate search parameter s=0;

S08: the search value V calculating maximum mill speed _max0=V ₀+ 0.5s;

S10: calculate draught pressure and rolling power according to the device parameter of unit and technological parameter, and utilize unit security admission coefficient η to carry out comprehensive descision, ensures the safe clearance of Rolling Production, wherein, and unit security admission coefficient η=0.85-0.95;

S21: make s=s+1, proceeds to step S08;

S22: judge inequality V _max0-0.5 > V ₀set up? if inequality is set up, then make V ₀=V _max0-0.5, proceed to step S05; Until inequality is false, proceed to step S23;

S23: judge inequality $\left\{\begin{array}{c}{\mathrm{\&lambda;}}_i<{\mathrm{\&lambda;}}_{i\max }\\ T_i<\mathrm{\&eta;}{T}_{i\max }\end{array}\right.$ Set up? if inequality is set up, then proceed to step S06, increase a step-size in search, redistribute deformation distribution ratio and outlet tension value; Until inequality is false, proceed to step S24;

S24: will the maximum mill speed V obtained be searched for _max0=V _max0-0.5 as controling parameters, sends the roll control system of five Stands Cold Tandem Mill groups to.

2. the rolling efficiency method for improving being suitable for five Stands Cold Tandem Mill groups according to claim 1, is characterized in that described step S10 comprises the following steps:

S11: according to original depth H ₀, finished product thickness h ₀with the reduction distribution value λ of frame 1-5 _i, calculate reduction ratio and the exit thickness of each frame, wherein the computation model of reduction ratio is:

$\left\{\begin{array}{c}{\mathrm{\&epsiv;}}_1=\frac{(h_0-h_5)}{h_0}{\mathrm{\&lambda;}}_1\\ {\mathrm{\&epsiv;}}_2=\frac{(h_0-h_5)}{h_0-(h_0-h_5){\mathrm{\&lambda;}}_1}{\mathrm{\&lambda;}}_2\\ {\mathrm{\&epsiv;}}_3=\frac{(h_0-h_5)}{h_0-(h_0-h_5)({\mathrm{\&lambda;}}_1+{\mathrm{\&lambda;}}_2)}{\mathrm{\&lambda;}}_3\\ {\mathrm{\&epsiv;}}_4=\frac{(h_0-h_5)}{h_0-(h_0-h_5)({\mathrm{\&lambda;}}_1+{\mathrm{\&lambda;}}_2+{\mathrm{\&lambda;}}_3)}{\mathrm{\&lambda;}}_4\\ {\mathrm{\&epsiv;}}_5=\frac{(h_0-h_5)}{h_0-(h_0-h_5)({\mathrm{\&lambda;}}_1+{\mathrm{\&lambda;}}_2+{\mathrm{\&lambda;}}_3+{\mathrm{\&lambda;}}_4)}{\mathrm{\&lambda;}}_5\end{array}\right.,$

Each rack outlet thickness machine modeling type is: h _i=h _i-1(1-ε _i);

In various above, i is corresponding shelf number.

S12: the principle equal according to second flow, the outlet mill speed of computer rack 1-4

S13: with entrance tension force T _i-1, outlet tension force T _i, reduction ratio ε _i, initial strength σ _s0, strain hardening coefficient is k _s, mill speed is v _i, the width B of band, inlet thickness be h _i-1with exit thickness h _ifor primary condition, calculate each frame at current process lubricating regime, the draught pressure P under rolling procedure state _iwith rolling power F _i;

S14: judge inequality $\left\{\begin{array}{c}{P}_i<{\mathrm{\&eta;P}}_{i\max }\\ F_i<\mathrm{\&eta;}{F}_{i\max }\end{array}\right.$ Set up? if inequality is set up, then proceed to step S21; If inequality is false, proceed to step S22.