CN101927261A - Method for comprehensively optimizing process lubrication system of secondary cold rolling unit in rolling mode - Google Patents

Method for comprehensively optimizing process lubrication system of secondary cold rolling unit in rolling mode Download PDF

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CN101927261A
CN101927261A CN2010100333088A CN201010033308A CN101927261A CN 101927261 A CN101927261 A CN 101927261A CN 2010100333088 A CN2010100333088 A CN 2010100333088A CN 201010033308 A CN201010033308 A CN 201010033308A CN 101927261 A CN101927261 A CN 101927261A
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frame
rolling
secondary cold
emulsion
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CN101927261B (en
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白振华
马莉萍
彭冲
张冬冬
吴东闯
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JIANGSU JIUTIAN PHOTOELECTRIC TECHNOLOGY CO., LTD.
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Yanshan University
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Abstract

The invention discloses a method for comprehensively optimizing a process lubrication system of a secondary cold rolling unit in the rolling mode. Through abundant field experiments and theoretical researches, on the basis of putting forward a comprehensive control index of plate-shaped oil consumption cleanness for the first time, and under the constraint condition of the control on slip and heat-slip hurts, the invention discloses a set of complete method for comprehensively optimizing process lubrication system of secondary cold rolling unit in a rolling mode by fully combining with equipment and the process characteristics of a secondary cold rolling procedure, aiming to ensure the plate-shaped quality of band steel, reduce the surface residual oil of the band steel, improve the surface cleanness of the band steel and reduce oil consumption. By comprehensively optimizing and setting the flow, the concentration and the initial temperature of emulsified liquid, the method realizes the following four targets that (1) the secondary cold rolling unit has stable rolling without problems of slip and the like, thereby ensuring a certain rolling speed, and the potential energy of the unit is fully exerted, thereby the production efficiency and the yield are improved; (2) the band steel does not generate the defect of heat-slip hurt; (3) the band steel has favorable discharge plate shape; and (4) the surface of the band steel has high cleanness and less oil consumption.

Description

Method for comprehensively optimizing process lubrication system under the secondary cold-rolling unit rolling mode
Technical field
The present invention relates to a kind of secondary cold-rolling production Technology, method for comprehensively optimizing process lubrication system under particularly a kind of secondary cold-rolling unit rolling mode.
Background technology
Secondary cold-rolling is after once cold rolling and annealing, will be with steel further to depress attenuate, to improve the hardness and the intensity of material.In the secondary cold-rolling production process, for the surface temperature that reduces roll and band, reduce coefficient of friction and frictional force on the contact arc surface, deformed area, prevent that metal is bonded at the wearing and tearing that roller surface reduces roll simultaneously, often need to spray emulsion and carry out technological lubrication to roll and strip surface.The quality of technological lubrication will directly have influence on the rolling stability and the quality of product.Under the situation that the emulsion kind is determined, the technological lubrication system comprises three parts such as setting of emulsion flow, concentration, initial temperature.Like this, how these three partial parameters are carried out integrated optimization and setting, guaranteeing rolling stability, giving full play under the prerequisite of milling train potential, improve the quality of products, reduce the emphasis that oil consumption just becomes on-the-spot tackling key problem.In the past, on-the-spot setting for above three parameters, the method that often adopts form to combine with operative employee's experience, specific aim are not strong, randomness is bigger, cause constant product quality relatively poor.For this reason, the present invention is through a large amount of field experiment and theoretical research, abundant equipment and technology characteristics in conjunction with the secondary cold-rolling operation, on the basis that has proposed a plate shape oil consumption cleannes Comprehensive Control index first, to guarantee the belt plate shape quality, reduce the belt steel surface Residual oil, improve the belt steel surface cleannes, to reduce oil consumption as the control target, as constraints, provided method for comprehensively optimizing process lubrication system under the complete secondary cold-rolling unit rolling mode of a cover with the control with hot sliding injury of skidding.By integrated optimization and setting to three parameters such as emulsion flow, concentration, initial temperatures, realize following four targets: (1) is rolling stable, and problem such as do not occur skidding guarantees certain mill speed, give full play to unit potential, in the hope of enhancing productivity and output; (2) hot sliding injury defective does not appear in the band steel; (3) band exit plate shape is good; (4) surface cleanness height, oil consumption are few.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides method for comprehensively optimizing process lubrication system under a kind of secondary cold-rolling unit rolling mode, this method can improve mill speed and surface quality of products and strip shape quality, reduces oil consumption, guarantees the production capacity and the lumber recovery of unit.To achieve these goals, the present invention has adopted following technical scheme: method for comprehensively optimizing process lubrication system under a kind of secondary cold-rolling unit rolling mode comprises the following step that can be carried out by computer:
(1) device parameter of collection secondary cold-rolling unit mainly comprises: 1 #With 2 #Frame work roll diameter D W1, D W2, 1 #With 2 #Frame intermediate calender rolls diameter D M1, D M2, 1 #With 2 #Frame support roller diameter D B1, D B2, 1 #Frame working roll and intermediate calender rolls and backing roll roll shape distribution Δ D 1wi, Δ D 1mi, Δ D 1bi, 2 #Frame working roll and intermediate calender rolls and backing roll roll shape distribution Δ D 2wi, Δ D 2mi, Δ D 2bi, 1 #With 2 #Frame working roll barrel length L W1, L W2, 1 #With 2 #Frame intermediate calender rolls barrel length L M1, L M2, 1 #With 2 #Frame support roller barrel length L B1, L B2, 1 #With 2 #Frame working roll housing screw centre-to-centre spacing l W1, l W2, 1 #With 2 #Frame intermediate calender rolls housing screw centre-to-centre spacing l M1, l M2, 1 #With 2 #Screw centre-to-centre spacing l under the frame support roll-in B1, l B2, 1 #With 2 #The critical slip factor value ψ of frame 1 *, ψ 2 *, 1 #With 2 #The critical slip injury index value of frame
Figure G2010100333088D00021
(2) collect the technological lubrication characterisitic parameter of secondary cold-rolling unit, comprise the maximum stream flow w of emulsion MaxCmax C MaxMinimum temperature and maximum temperature T that emulsion allows Min, T Max
(3) collection treats that the crucial rolling technological parameter of strip mainly comprises: the cross direction profiles value L that comes flitch shape i, the width B, supplied materials thickness H of band, total drafts ε 0, the drafts distribution coefficient ξ between 1# and the 2# frame i, forward pull setting value T 1, middle tension force setting value T 2, backward pull setting value T 0, 1 #Frame intermediate calender rolls shifting amount δ 1, 2 #Frame intermediate calender rolls shifting amount δ 2, 1 #Frame work roll bending power S 1w, 1 #Frame intermediate calender rolls bending roller force S 1m, 2 #Frame work roll bending power S 2w, 2 #Frame intermediate calender rolls bending roller force S 2m
(4) the initial set value G of given emulsion complex optimum object function 0=1.0 * 10 20
(5) set emulsion temperature pilot process calculating parameter k 1=0, the temperature step-size in search is Δ T=1.5 ℃;
(6) given emulsion temperature is T c=T Min+ k 1Δ T;
(7) set concentration of emulsion used process calculating parameter k 2=1, the concentration step-size in search is Δ C=0.8%;
(8) given concentration of emulsion used is C=k 2Δ C;
(9) set emulsion discharge process calculating parameter k 3=1, the flow step-size in search is Δ w=0.05l/min;
(10) given emulsion flow is w=k 3Δ w;
(11) calculate thermal conductivity factor k, 1# frame coefficientoffriction under the current technological lubrication condition 1, 2# frame coefficient of friction μ 2
(12) calculate the 1# under current technological lubrication condition and the rolling technological parameter, the value ψ of 2# frame slip factor 1, ψ 2
(13) judge inequality
Figure G2010100333088D00031
Whether set up simultaneously,, otherwise change step (23) over to if set up then change step (14) over to;
(14) calculate the 1# under the current technological lubrication condition, the value of 2# frame slip injury index
Figure G2010100333088D00032
(15) judge inequality
Figure G2010100333088D00033
Whether set up simultaneously,, otherwise change step (23) over to if set up then change step (16) over to;
(16) calculate the 1# frame under the current technological lubrication condition and the draught pressure P of 2# frame 1, P 2
(17) calculate 1# frame and 2# frame working roll Δ D under the current technological lubrication condition W1i, Δ D W2i
(18) calculate the band exit plate shape σ of 2# frame under the hot convexity of work at present roller, intermediate calender rolls and backing roll 2i
(19) calculate the oil consumption index k of unit y=Cw;
(20) calculate unit resid amount index k c = α c 1 C α c 2 (in the formula: α C1, α C2-Residual oil characteristic coefficient);
(21) calculate emulsion complex optimum object function G (X)=(k under the current technological lubrication condition y) α(k c) β((max (σ 2i)-min (σ 2i))/T 1) (in the formula: α, beta-oil consumption and Residual oil weight coefficient);
(22) compare G (X) and G 0Size, if inequality G (X) p G 0, G then 0=G (X), T c *=T c, C *=C, w *=w;
(23) judge inequality w≤w MaxSet up? set up as inequality, then make k 3=k 3+ 1 changes step (10) over to; Otherwise change step (24) over to;
(24) judge inequality C≤C MaxSet up? set up as inequality, then make k 2=k 2+ 1 changes step (8) over to; Otherwise change step (25) over to;
(25) judge inequality T c≤ T MaxSet up? set up as inequality, then make k 1=k 1+ 1 changes step (6) over to; Otherwise change step (26) over to;
(26) the optimum setting value T of output emulsion c *, C *, w *
(27) finish to calculate.
Description of drawings
Below in conjunction with accompanying drawing specific description is in detail carried out further in preferred embodiment of the present invention.
Fig. 1 (a), Fig. 1 (b), Fig. 1 (c) are the The general frame of comprehensively optimizing process lubrication system under the secondary cold-rolling unit rolling mode;
Fig. 2 is a 1# frame work roll thermal crown distribution map in the step 17 in the first embodiment of the invention;
Fig. 3 is a 2# frame work roll thermal crown distribution map in the step 17 in the first embodiment of the invention;
Fig. 4 is 2# frame exit plate shape curve distribution figure in the step 18 in the first embodiment of the invention;
Fig. 5 is a 1# frame work roll thermal crown distribution map in the step 17 in the second embodiment of the invention;
Fig. 6 is a 2# frame work roll thermal crown distribution map in the step 17 in the second embodiment of the invention;
Fig. 7 is 2# frame exit plate shape curve distribution figure in the step 18 in the second embodiment of the invention.
The specific embodiment
First embodiment
Accompanying drawing 1 is the The general frame of comprehensively optimizing process lubrication system under the secondary cold-rolling unit rolling mode.Now be that 0.155mm * 824mm, steel grade are that the band steel of MR DR-8CA is an example, describe comprehensively optimizing process lubrication system implementation procedure under its rolling mode by specific secondary cold-rolling unit with the specification.
At first, in step 1, the device parameter of collecting the secondary cold-rolling unit mainly comprises: 1 #With 2 #Frame work roll diameter D W1=560mm, D W2=560mm, 1 #With 2 #Frame intermediate calender rolls diameter D M1=560mm, D M2=560mm, 1 #With 2 #Frame support roller diameter D B1=1000mm, D B2=1000mm, 1 #Frame working roll and intermediate calender rolls and backing roll roll shape distribution Δ D 1wi=0, Δ D 1mi=0, Δ D 1bi=0,2 #Frame working roll and intermediate calender rolls and backing roll roll shape distribution Δ D 2wi=0, Δ D 2mi=0, Δ D 2bi=0,1 #With 2 #Frame working roll barrel length L W1=1220mm, L W2=1220mm, 1 #With 2 #Frame intermediate calender rolls barrel length L M1=1220mm, L M2=1220mm, 1 #With 2 #Frame support roller barrel length L B1=1220mm, L B2=1220mm, 1 #With 2 #Frame working roll housing screw centre-to-centre spacing l W1=2200mm, l W2=2200mm, 1 #With 2 #Frame intermediate calender rolls housing screw centre-to-centre spacing l M1=2210mm, l M2=2210mm, 1 #With 2 #Screw centre-to-centre spacing l under the frame support roll-in B1=2210mm, l B2=2210mm, 1 #With 2 #The critical slip factor value ψ of frame 1 *=0.42, ψ 2 *=0.41,1 #With 2 #The critical slip injury index value of frame
Figure G2010100333088D00051
5.2
Subsequently, in step 2, collect the technological lubrication characterisitic parameter of secondary cold-rolling unit, comprise the maximum stream flow w of emulsion Max=5.2l/min; Cmax C Max=15%; Minimum temperature and maximum temperature T that emulsion allows Min=50 ℃, T Max=65 ℃;
Subsequently, in step 3, collect the crucial rolling technological parameter for the treatment of rolled band steel, mainly comprise: the cross direction profiles value L that comes flitch shape i=0, the width B=824mm of band, supplied materials thickness H=0.155mm, total drafts ε 0=35%, drafts distribution coefficient ξ=0.95 between 1# and the 2# frame, forward pull setting value T 1=155Mpa, middle tension force setting value T 2=218Mpa, backward pull setting value T 0=133Mpa, 1 #Frame intermediate calender rolls shifting amount δ 1=75mm, 2 #Frame intermediate calender rolls shifting amount δ 2=75mm, 1 #Frame work roll bending power S 1w=8.4t, 1 #Frame intermediate calender rolls bending roller force S 1m=9.2t, 2 #Frame work roll bending power S 2w=7.6t, 2 #Frame intermediate calender rolls bending roller force S 2m=8.3t;
Subsequently, in step 4, the initial set value G of given emulsion complex optimum object function 0=1.0 * 10 20
Subsequently, in step 5, set emulsion temperature pilot process calculating parameter k 1=0, the temperature step-size in search is Δ T=1.5 ℃;
Subsequently, in step 6, given emulsion temperature is T c=T Min+ k 1Δ T=50 ℃;
Subsequently, in step 7, set concentration of emulsion used process calculating parameter k 2=1, the concentration step-size in search is Δ C=0.8%;
Subsequently, in step 8, given concentration of emulsion used is C=k 2Δ C=0.8%;
Subsequently, in step 9, set emulsion discharge process calculating parameter k 3=1, the flow step-size in search is Δ w=0.05l/min;
Subsequently, in step 10, given emulsion flow is w=k 3Δ w=0.05l/min;
Subsequently, in step 11, calculate the thermal conductivity factor k=2876J/ (sm under the current technological lubrication condition 2℃), 1# frame coefficientoffriction 1=0.05,2# frame coefficient of friction μ 2=0.09;
Subsequently, in step 12, calculate the 1# under current technological lubrication condition and the rolling technological parameter, the value ψ of 2# frame slip factor 1=0.35, ψ 2=0.38;
Subsequently, in step 13, judge inequality
Figure G2010100333088D00061
Whether set up simultaneously? obviously set up, change step 14 over to;
Subsequently, in step 14, calculate the 1# under the current technological lubrication condition, the value of 2# frame slip injury index
Figure G2010100333088D00071
Subsequently, in step 15, judge inequality
Figure G2010100333088D00072
Whether set up simultaneously? obviously set up, change step 16 over to;
Subsequently, in step 16, calculate the 1# frame under the current technological lubrication condition and the draught pressure P of 2# frame 1=350t, P 2=285t;
Subsequently, in step 17, calculate 1# frame and 2# frame work roll thermal crown Δ D under the current technological lubrication condition W1i, Δ D W2i, distribution curve is shown in accompanying drawing 2, accompanying drawing 3;
Subsequently, in step 18, calculate the band exit plate shape σ of 2# frame under the hot convexity of work at present roller, intermediate calender rolls and backing roll 2i, distribution curve as shown in Figure 4;
Subsequently, in step 19, calculate the oil consumption index k of unit y=Cw=0.008*0.05=0.0004;
Subsequently, in step 20, calculate unit resid amount index k c = α c 1 C α c 2 = 0.26 (Residual oil characteristic coefficient α c 1 = 0.75 , α c 2 = 0.22 )；
Subsequently, in step 21, calculate emulsion complex optimum object function G (X)=(k under the current technological lubrication condition y) α(k c) β((max (σ 2i)-min (σ 2i))/T 1)=0.32;
Subsequently, in step 22, compare G (X) and G 0Size, if inequality G (X) p G 0, G then 0=G (X), T c * = T c , C *＝C、w *＝w；
Subsequently, in step 23, judge inequality w≤w MaxSet up? obviously, inequality is set up, and then makes k 3=k 3+ 1 changes step 10 over to;
Subsequently, in step 24, judge inequality C≤C MaxSet up? obviously, inequality is set up, and then makes k 2=k 2+ 1 changes step 8 over to;
Subsequently, in step 25, judge inequality T c≤ T MaxSet up? obviously, inequality is set up, and then makes k 1=k 1+ 1 changes step 6 over to;
Subsequently, in step 26, the optimum setting value of output emulsion
Figure G2010100333088D00081
C *=6.4%, w *=4.5l/min.
At last, for convenience relatively, as shown in table 1, list technological lubrication system that adopts comprehensively optimizing process lubrication system technology under the secondary cold-rolling unit rolling mode of the present invention and draw and the technological lubrication system that adopts conventional method to provide respectively, and provide corresponding practical rolling speed, plate shape value, resid amount.
Table 1 adopts comprehensively optimizing process lubrication system skill under the secondary cold-rolling unit rolling mode of the present invention
Art provides pre-set parameter with adopting conventional method
Rolling technological parameter Conventional method Technology of the present invention
Mill speed (m/min) 672 923
Production board shape (I) 8.2 6.5
Average surface resid amount (mg/m 2) 134.38 66.16
Concentration of emulsion used (%) 8.2 6.4
Emulsion flow (l/min) 4.9 4.5
The emulsion temperature (℃) 59 60.5
By table 1 as can be seen, adopt the method for the invention to compare with conventional method, mill speed is brought up to 923m/min from 672m/min, has improved 37.4%; Plate shape drops to 6.5I from 8.2I, has descended 20.7%; The belt steel surface resid amount is from 134.88mg/m 2Drop to 66.16mg/m 2, descended 51%.This explanation adopts the method for the invention can effectively improve the output and the quality of product.
Second embodiment
In order further to set forth basic thought of the present invention, now be that 0.18mm * 968mm, steel grade are that the band steel of MR DR-8BA is an example again with the specification, further describe specific secondary cold-rolling unit by accompanying drawing 1 and describe comprehensively optimizing process lubrication system implementation procedure under its rolling mode.。
At first, in step 1, the device parameter of collecting the secondary cold-rolling unit mainly comprises: 1 #With 2 #Frame work roll diameter D W1=560mm, D W2=560mm, 1 #With 2 #Frame intermediate calender rolls diameter D M1=560mm, D M2=560mm, 1 #With 2 #Frame support roller diameter D B1=1000mm, D B2=1000mm, 1 #Frame working roll and intermediate calender rolls and backing roll roll shape distribution Δ D 1wi=0, Δ D 1mi=0, Δ D 1bi=0,2 #Frame working roll and intermediate calender rolls and backing roll roll shape distribution Δ D 2w1=0, Δ D 2mi=0, Δ D 2bi=0,1 #With 2 #Frame working roll barrel length L W1=1220mm, L W2=1220mm, 1 #With 2 #Frame intermediate calender rolls barrel length L M1=1220mm, L M2=1220mm, 1 #With 2 #Frame support roller barrel length L B1=1220mm, L B2=1220mm, 1 #With 2 #Frame working roll housing screw centre-to-centre spacing l W1=2200mm, l W2=2200mm, 1 #With 2 #Frame intermediate calender rolls housing screw centre-to-centre spacing l M1=2210mm, l M2=2210mm, 1 #With 2 #Screw centre-to-centre spacing l under the frame support roll-in B1=2210mm, l B2=2210mm, 1 #With 2 #The critical slip factor value of frame ψ 1 * = 0.42 , ψ 2 * = 0.41 , 1 #With 2 #The critical slip injury index value of frame
Figure G2010100333088D00093
Subsequently, in step 2, collect the technological lubrication characterisitic parameter of secondary cold-rolling unit, comprise the maximum stream flow w of emulsion Max=5.2l/min; Cmax C Max=15%; Minimum temperature and maximum temperature T that emulsion allows Min=50 ℃, T Max=65 ℃;
Subsequently, in step 3, collect the crucial rolling technological parameter for the treatment of rolled band steel, mainly comprise: the cross direction profiles value L that comes flitch shape i=0, the width B=968mm of band, supplied materials thickness H=0.18mm, total drafts ε 0=18%, drafts distribution coefficient ξ=0.9 between 1# and the 2# frame, forward pull setting value T 1=123Mpa, middle tension force setting value T 2=208Mpa, backward pull setting value T 0=121Mpa, 1 #Frame intermediate calender rolls shifting amount δ 1=75mm, 2 #Frame intermediate calender rolls shifting amount δ 2=75mm, 1 #Frame work roll bending power S 1w=7.5t, 1 #Frame intermediate calender rolls bending roller force S 1m=8.3t, 2 #Frame work roll bending power S 2w=8.4t, 2 #Frame intermediate calender rolls bending roller force S 2m=9.1t;
Subsequently, in step 4, the initial set value G of given emulsion complex optimum object function 0=1.0 * 10 20
Subsequently, in step 5, set emulsion temperature pilot process calculating parameter k 1=0, the temperature step-size in search is Δ T=1.5 ℃;
Subsequently, in step 6, given emulsion temperature is T c=T Min+ k 1Δ T=50 ℃;
Subsequently, in step 7, set concentration of emulsion used process calculating parameter k 2=1, the concentration step-size in search is Δ C=0.8%;
Subsequently, in step 8, given concentration of emulsion used is C=k 2Δ C=0.8%;
Subsequently, in step 9, set emulsion discharge process calculating parameter k 3=1, the flow step-size in search is Δ w=0.05l/min;
Subsequently, in step 10, given emulsion flow is w=k 3Δ w=0.05l/min;
Subsequently, in step 11, calculate the thermal conductivity factor k=2942J/ (sm under the current technological lubrication condition 2℃), 1# frame coefficientoffriction 1=0.06,2# frame coefficient of friction μ 2=0.1;
Subsequently, in step 12, calculate the 1# under current technological lubrication condition and the rolling technological parameter, the value ψ of 2# frame slip factor 1=0.29, ψ 2=0.21;
Subsequently, in step 13, judge inequality
Figure G2010100333088D00101
Whether set up simultaneously? obviously set up, change step 14 over to;
Subsequently, in step 14, calculate the 1# under the current technological lubrication condition, the value of 2# frame slip injury index
Figure G2010100333088D00102
Subsequently, in step 15, judge inequality
Figure G2010100333088D00103
Whether set up simultaneously? obviously set up, change step 16 over to;
Subsequently, in step 16, calculate the 1# frame under the current technological lubrication condition and the draught pressure P of 2# frame 1=420t, P 2=310t;
Subsequently, in step 17, calculate 1# frame and 2# frame work roll thermal crown Δ D under the current technological lubrication condition W1i, Δ D W2i, distribution curve is shown in accompanying drawing 5, accompanying drawing 6;
Subsequently, in step 18, calculate the band exit plate shape σ of 2# frame under the hot convexity of work at present roller, intermediate calender rolls and backing roll 2i, distribution curve as shown in Figure 7;
Subsequently, in step 19, calculate the oil consumption index k of unit y=Cw=0.008*0.05=0.0004;
Subsequently, in step 20, calculate unit resid amount index k c = α c 1 C α c 2 = 0.26 (Residual oil characteristic coefficient α c 1 = 0.75 , α c 2 = 0.22 )；
Subsequently, in step 21, calculate emulsion complex optimum object function G (X)=(k under the current technological lubrication condition y) α(k c) β((max (σ 2i)-min (σ 2i))/T 1)=0.56;
Subsequently, in step 22, compare G (X) and G 0Size, if inequality G (X) p G 0, G then 0=G (X), T c * = T c , C *＝C、w *＝w；
Subsequently, in step 23, judge inequality w≤w MaxWhether set up, obviously, inequality is set up, and then makes k 3=k 3+ 1 changes step 10 over to;
Subsequently, in step 24, judge inequality C≤C MaxWhether set up, obviously, inequality is set up, and then makes k 2=k 2+ 1 changes step 8 over to;
Subsequently, in step 25, judge inequality T c≤ T MaxWhether set up, obviously, inequality is set up, and then makes k 1=k 1+ 1 changes step 6 over to;
Subsequently, in step 26, the optimum setting value of output emulsion C *=7.2%, w *=4.25l/min.
At last, for convenience relatively, as shown in table 2, list technological lubrication system that adopts comprehensively optimizing process lubrication system technology under the secondary cold-rolling unit rolling mode of the present invention and draw and the technological lubrication system that adopts conventional method to provide respectively, and provide corresponding practical rolling speed, plate shape value, resid amount.
Table 2 adopts comprehensively optimizing process lubrication system skill under the secondary cold-rolling unit rolling mode of the present invention
Rolling technological parameter Conventional method Technology of the present invention
Mill speed (m/min) 721 ?943
Production board shape (I) 8.5 ?6.8
Average surface resid amount (mg/m 2) 121.34 ?73.25
Concentration of emulsion used (%) 11.2 ?7.2
Emulsion flow (l/min) 5.1 ?4.25
The emulsion temperature (℃) 60.2 ?59
By table 2 as can be seen, adopt the method for the invention to compare with conventional method, mill speed is brought up to 943m/min from 721m/min, has improved 23.5%; Plate shape drops to 6.8I from 8.5I, has descended 20%; The belt steel surface resid amount is from 121.34mg/m 2Drop to 73.25mg/m 2, descended 39.6%.This explanation adopts the method for the invention can effectively improve the output and the quality of product.

Claims (4)

1. method for comprehensively optimizing process lubrication system under the secondary cold-rolling unit rolling mode comprises the following step that can be carried out by computer:
(a) device parameter of collection secondary cold-rolling unit;
(b) the technological lubrication characterisitic parameter of collection secondary cold-rolling unit;
(c) the crucial rolling technological parameter of strip is treated in collection;
(d) the initial set value G of given emulsion complex optimum object function 0=1.0 * 10 20
(e) set emulsion temperature pilot process calculating parameter k 1=0, the temperature step-size in search is Δ T=1.5 ℃;
(f) given emulsion temperature is T c=T Min+ k 1Δ T;
(g) set concentration of emulsion used process calculating parameter k 2=1, the concentration step-size in search is Δ C=0.8%;
(h) given concentration of emulsion used is C=k 2Δ C;
(i) set emulsion discharge process calculating parameter k 3=1, the flow step-size in search is Δ w=0.05l/min;
(j) given emulsion flow is w=k 3Δ w;
(k) calculate thermal conductivity factor k, 1# frame coefficientoffriction under the current technological lubrication condition 1, 2# frame coefficient of friction μ 2
(l) calculate the 1# under current technological lubrication condition and the rolling technological parameter, the value ψ of 2# frame slip factor 1, ψ 2
(m) judge inequality ψ 1 ≤ ψ 1 * ψ 2 ≤ ψ 2 * Whether set up simultaneously,, otherwise change step (w) over to if set up then change step (n) over to;
(n) calculate the 1# under the current technological lubrication condition, the value of 2# frame slip injury index
Figure F2010100333088C00012
(o) judge inequality
Figure F2010100333088C00013
Whether set up simultaneously,, otherwise change step (w) over to if set up then change step (p) over to;
(p) calculate the 1# frame under the current technological lubrication condition and the draught pressure P of 2# frame 1, P 2
(q) calculate 1# frame and 2# frame work roll thermal crown Δ D under the current technological lubrication condition W1i, Δ D W2i
(r) calculate the band exit plate shape σ of 2# frame under the hot convexity of work at present roller, intermediate calender rolls and backing roll 2i
(s) calculate the oil consumption index k of unit y=Cw;
(t) calculate unit resid amount index k c = α c 1 C α c 2 ;
(u) calculate emulsion complex optimum object function G (X)=(k under the current technological lubrication condition y) α(k c) β((max (σ 2i)-min (σ 2i))/T 1);
(v) compare G (X) and G 0Size, if inequality G (X) p G 0, G then 0=G (X), T c * = T c , C *＝C、w *＝w；
(w) judge inequality w≤w MaxWhether set up, set up, then make k as inequality 3=k 3+ 1 changes step (j) over to; Otherwise change step (x) over to;
(x) judge inequality C≤C MaxWhether set up, set up, then make k as inequality 2=k 2+ 1 changes step (h) over to; Otherwise change step (y) over to;
(y) judge inequality T c≤ T MaxWhether set up, set up, then make k as inequality 1=k 1+ 1 changes step (f) over to; Otherwise change step (z) over to;
(z) the optimum setting value T of output emulsion c *, C *, w *
(aa) finish to calculate.
2. method for comprehensively optimizing process lubrication system under the secondary cold-rolling unit rolling mode according to claim 1 is characterized in that: the device parameter of secondary cold-rolling unit mainly comprises in the step (a): 1 #With 2 #Frame work roll diameter D W1, D W2, 1 #With 2 #Frame intermediate calender rolls diameter D M1, D M2, 1 #With 2 #Frame support roller diameter D B1, D B2, 1 #Frame working roll and intermediate calender rolls and backing roll roll shape distribution Δ D 1wi, Δ D 1mi, Δ D 1bi, 2 #Frame working roll and intermediate calender rolls and backing roll roll shape distribution Δ D 2wi, Δ D 2mi, Δ D 2bi, 1 #With 2 #Frame working roll barrel length L W1, L W2, 1 #With 2 #Frame intermediate calender rolls barrel length L M1, L M2, 1 #With 2 #Frame support roller barrel length L B1, L B2, 1 #With 2 #Frame working roll housing screw centre-to-centre spacing l W1, l W2, 1 #With 2 #Frame intermediate calender rolls housing screw centre-to-centre spacing l M1, l M2, 1 #With 2 #Screw centre-to-centre spacing l under the frame support roll-in B1, l B2, 1 #With 2 #The critical slip factor value ψ of frame 1 *, ψ 2 *1 #With 2 #The critical slip injury index value of frame
Figure F2010100333088C00031
3. method for comprehensively optimizing process lubrication system under the secondary cold-rolling unit rolling mode according to claim 1 is characterized in that: the technological lubrication characterisitic parameter of secondary cold-rolling unit mainly comprises described in the step (b): the maximum stream flow w of emulsion MaxCmax C MaxMinimum temperature and maximum temperature T that emulsion allows Min, T Max
4. method for comprehensively optimizing process lubrication system under the secondary cold-rolling unit rolling mode according to claim 1 is characterized in that: treat described in the step (c) that the crucial rolling technological parameter of strip mainly comprises coming the cross direction profiles value L of flitch shape i, the width B, supplied materials thickness H of band, total drafts ε 0, drafts distribution coefficient ξ, forward pull setting value T between 1# and the 2# frame 1, middle tension force setting value T 2, backward pull setting value T 0, 1 #Frame intermediate calender rolls shifting amount δ 1, 2 #Frame intermediate calender rolls shifting amount δ 2, 1 #Frame work roll bending power S 1w, 1 #Frame intermediate calender rolls bending roller force S 1m, 2 #Frame work roll bending power S 2w, 2 #Frame intermediate calender rolls bending roller force S 2m
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