CN113319137A - Comprehensive optimization method for ultra-high strength steel process lubrication system of six-stand cold continuous rolling unit - Google Patents
Comprehensive optimization method for ultra-high strength steel process lubrication system of six-stand cold continuous rolling unit Download PDFInfo
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- CN113319137A CN113319137A CN202110617958.5A CN202110617958A CN113319137A CN 113319137 A CN113319137 A CN 113319137A CN 202110617958 A CN202110617958 A CN 202110617958A CN 113319137 A CN113319137 A CN 113319137A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
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Abstract
The invention discloses a method for comprehensively optimizing a lubrication system of an ultrahigh-strength steel process of a six-stand cold continuous rolling unit, which comprises the following specific steps of: s1, collecting various relevant parameters of the six-stand cold continuous rolling unit; s2, defining four target functions; s3, setting a target function of a first six-stand cold continuous rolling unit and an initial value of a process lubrication system of each stand; s4, calculating three defined objective functions; s5, calculating an optimized distribution function of each rack and an optimized comprehensive control objective function of the process lubrication system for rolling the ultrahigh-strength steel of each rack cold continuous rolling unit according to the process lubrication system parameters of each rack; and S6, obtaining and outputting the optimized values of the process lubrication system of each rack according to the comprehensive control objective function. The invention develops a comprehensive optimization method of the ultra-high strength steel process lubrication system of the six-stand cold continuous rolling unit by combining the equipment and process characteristics of the six-stand cold continuous rolling unit, provides guidance of the lubrication system for the site, improves the production efficiency of enterprises and saves the production cost.
Description
Technical Field
The invention belongs to the technical field of cold-rolled steel plates, and particularly relates to a comprehensive optimization method for a lubrication system of an ultrahigh-strength steel process of a six-stand cold continuous rolling unit.
Background
In the past, the research on the process lubrication system of the cold continuous rolling unit mainly focuses on a five-stand cold continuous rolling unit and mainly focuses on the production of common strip steel. For a six-stand cold continuous rolling unit, a theoretical guidance system corresponding to the unit is not formed, so that the phenomenon of over-lubrication and under-lubrication frequently occurs in the cold continuous rolling process of ultrahigh-strength steel, and further, the phenomenon of slipping and hot slipping of individual stands is caused, and the phenomenon of insufficient cooling sometimes exists, so that the rolling stability and the finished product quality of the unit are seriously influenced.
Therefore, the equipment and process characteristics of the six-stand cold continuous rolling unit are fully combined, the relation among the thickness and the friction coefficient of the lubricating oil film and the rolling stability is researched on the basis of analyzing the action and the mechanism of the emulsion, and the influence of a process lubrication system on the rolling stability is analyzed, so that the technical problem that the improvement of the rolling stability of the six-stand cold continuous rolling unit and the finished product quality of the ultra-high strength steel is urgently needed and is a critical technical problem in the industry is provided.
Disclosure of Invention
In order to solve at least one of the technical problems, the invention provides a comprehensive optimization method for a lubrication system of an ultrahigh-strength steel process of a six-stand cold continuous rolling unit.
The purpose of the invention is realized by the following technical scheme:
the invention provides a comprehensive optimization method for a lubrication system of an ultrahigh-strength steel process of a six-stand cold continuous rolling unit, which comprises the following specific steps of:
s1, collecting equipment parameters of a six-stand cold continuous rolling unit, set parameters of a rolling procedure in the cold continuous rolling process of the ultrahigh-strength steel and process lubrication system parameters;
s2, defining a rolling stability control objective function of the upper surface and the lower surface of the strip steel, a lubricating difference control objective function of the upper surface and the lower surface of the strip steel, an emulsion cooling effect control objective function and a process lubricating system optimization comprehensive control objective function for rolling the ultrahigh-strength steel of the six-stand cold continuous rolling unit;
s3, setting an initial value of an optimized comprehensive control objective function of a process lubrication system for rolling the ultrahigh-strength steel of the first six-stand cold continuous rolling unit, and setting an initial value of the process lubrication system of each stand;
s4, taking the condition that the average lubricating oil film thickness of the upper surface of strip steel in the process lubrication system parameters of each rack is close to a target value as an optimization target, and calculating a rolling stability control target function of the upper surface and the lower surface of the strip steel of each rack, a lubricating difference control target function of the upper surface and the lower surface of the strip steel and an emulsion cooling effect control target function;
s5, calculating the optimized distribution function of each rack according to the technological lubrication system parameters of each rack, and calculating the technological lubrication system optimized comprehensive control objective function of rolling the ultrahigh-strength steel of each rack tandem cold mill set by combining the optimized distribution function of each rack with the rolling stability control objective function of the upper surface and the lower surface of the strip steel of each rack, the lubricating difference control objective function of the upper surface and the lower surface of the strip steel and the emulsion cooling effect control objective function;
s6, obtaining the optimal values of the technological lubrication system of each rack according to the technological lubrication system optimization comprehensive control objective function of the ultra-high-strength steel rolling of each rack cold continuous rolling unit, and outputting the optimal values of the technological lubrication system corresponding to each rack.
As a further improvement, in the step S1, the collected process lubrication schedule parameters mainly include an emulsion concentration influence coefficient, a rolling oil dynamic viscosity, a process lubrication schedule comprehensive influence coefficient, an emulsion initial temperature, an emulsion initial concentration, an emulsion maximum concentration and an emulsion minimum concentration, an emulsion initial temperature minimum value and a emulsion initial temperature maximum value, an emulsion flow minimum value and a emulsion flow maximum value on each stand, an emulsion flow minimum value and an emulsion flow maximum value under each stand, an emulsion flow rate on each stand and an emulsion flow rate under each stand, an average lubricating oil film thickness in rolling deformation areas on each stand and rolling deformation areas under each stand, corresponding friction coefficients in rolling deformation areas on each stand and rolling deformation areas under each stand, a slipping critical lubricating oil film thickness on the upper surface and the lower surface of the strip steel of each stand, and a thermal slipping critical lubricating oil film thickness on the upper surface and the lower surface of the strip steel of each stand.
As a further improvement, in the step S3, the initial values of each rack process lubrication system are set, including the initial optimized variables of each rack process lubrication system, and the search step length and the search range are given for the optimized variables of each rack process lubrication system, where the optimized variables of each rack process lubrication system include four, which are the emulsion concentration, the initial temperature of the emulsion, the upper emulsion flow rate, and the lower emulsion flow rate.
As a further improvement, in the step S4, the average lubricant film thickness of the upper surface and the lower surface of each strip steel of the stand includes the average lubricant film thickness of the rolling deformation zone on each stand, the slip critical lubricant film thickness of the upper surface and the lower surface of each strip steel of the stand, and the thermal slip critical lubricant film thickness of the upper surface and the lower surface of each strip steel of the stand.
As a further improvement, in the step S4, the strip steel upper surface average lubricating oil film thickness is an average value of the rolling deformation zone average lubricating oil film thickness on each stand, the strip steel upper surface slip critical lubricating oil film thickness on each stand and the strip steel upper surface thermal slip critical lubricating oil film thickness on each stand, and the target value is an average value of the strip steel upper surface thermal slip critical lubricating oil film thickness on each stand and the strip steel upper surface slip critical lubricating oil film thickness on each stand.
As a further improvement, in the step S4, the rolling stability control objective function of the upper surface of the strip steel of each stand is calculated as follows:
wherein G iswdsIs a control objective function, X, of the rolling stability of the upper surface of the strip steelwdsIs a parameter variable of a rolling stability control objective function of the upper surface of the strip steel, and subscript i is the number of the cold continuous rolling unit of the stand and alphaξIs the unit overall stability control coefficient, xibxs，iIs the average lubricating film thickness, xi, of the rolling deformation zone on each standrhss，iIs the thickness of the critical lubricating oil film of the thermal sliding damage of the upper surface of each frame strip steel, (1-alpha)ξ) 0.6 is the maximum stability deviation control coefficient, ξdhs，iThe thickness of the slipping critical lubricating oil film on the upper surface of each frame strip steel.
Calculating the rolling stability control objective function of the lower surface of the strip steel of each frame as follows:
wherein G iswdxIs a control objective function, X, of the rolling stability of the lower surface of the strip steelwdxIs a parameter variable xi of a rolling stability control objective function of the lower surface of the strip steelbxx，iIs the average lubricating oil film thickness, xi, of the rolling deformation zone under each standrhsx，iIs the thickness of the thermal sliding damage critical lubricating oil film on the lower surface of each frame strip steeldhx，iThe thickness of the slipping critical lubricating oil film on the lower surface of the strip steel of each frame.
As a further improvement, in the step S4, the control objective function for the difference between the lubrication on the upper and lower surfaces of the strip steel is calculated as follows:
wherein G iscyIs a control objective function of the lubricating difference of the upper and lower surfaces of the strip steel, XcyIs a parameter variable, beta, of a control objective function of the lubricating differences of the upper and lower surfaces of the strip steelξThe lubricating difference control coefficient of the upper surface and the lower surface of the integral strip steel of the unit is (1-beta)ξ) The maximum lubrication difference control coefficient of the upper surface and the lower surface of the strip steel.
As a further improvement, in the step S4, the emulsion cooling effect control objective function is calculated as follows:
wherein G islqIs an emulsion cooling effect control objective function, XlqIs a parameter variable, lambda, of an emulsion cooling effect control objective functionwqIs the unit integral cooling effect control coefficient (1-lambda)wq) Is the unit average cooling effect control coefficient, etalq，iIs the emulsion cooling effect coefficient in the i-th frame rolling process.
As a further improvement, the calculation of the technological lubrication system optimization comprehensive control objective function for the rolling of the ultrahigh-strength steel of each stand cold continuous rolling unit is as follows:
Grz(Xrz)＝λ1Gwds(Xwds)+λ2Gwdx(Xwdx)+λ3Gcy(Xcy)+λ4Glq(Xlq)
wherein G isrzIs an optimized comprehensive control objective function of a process lubrication system for rolling ultrahigh-strength steel of a cold continuous rolling unit, XrzIs a parameter variable, lambda, of a process lubrication system optimization comprehensive control objective function for rolling the ultrahigh-strength steel of the cold continuous rolling mill set1Is the comprehensive influence coefficient of the process lubrication system of the rolling stability control objective function of the upper surface of the strip steel; lambda [ alpha ]2Is the comprehensive influence coefficient of the process lubrication system of the rolling stability control objective function of the lower surface of the strip steel; lambda [ alpha ]3The comprehensive influence coefficient of the process lubrication system of the lubricating difference control objective function of the upper surface and the lower surface of the strip steel is shown; lambda [ alpha ]4Is the comprehensive influence coefficient of the process lubrication system of the emulsion cooling effect control objective function.
As a further improvement, in the step S6, the optimal value of the process lubrication system for each stand is obtained according to the objective function of the optimized and integrated control of the process lubrication system for the rolling of the ultra-high-strength steel in the cold continuous rolling mill set for each stand, and the optimal value of the process lubrication system corresponding to each stand is output, which specifically includes the following steps:
s61, starting circulation according to the number of the stand cold continuous rolling units, judging whether a process lubrication system optimized comprehensive control objective function for rolling the ultrahigh-strength steel of the current circulating stand cold continuous rolling unit is smaller than an initial value of a set process lubrication system optimized comprehensive control objective function for rolling the ultrahigh-strength steel of a first six-stand cold continuous rolling unit, if so, assigning the former value to the latter, and recording the value of a process lubrication system optimized variable of the current circulating stand cold continuous rolling unit;
s62, starting circulation according to the number of the optimized variables of the process lubrication system, and judging whether the value of each optimized variable of the process lubrication system is smaller than the maximum value of the optimized variable of the current circulation process lubrication system, if so, then:
Zi＝Zi min+(kj+1)ΔXrz
wherein, subscript i is the number of the cold continuous rolling units of the current circulating frame, ZiOptimizing variables, Z, for the process lubrication system of the current circulating frame cold continuous rolling uniti minOptimizing the minimum value of the variable, k, of the technological lubrication system of the current circulating frame cold continuous rolling unitjNumber of variables, Δ X, optimized for the current cycle process lubrication regimerzSetting a search step length for an optimized variable of a process lubrication system;
and S63, when the circulation of S62 is finished, outputting the value of the optimized variable of the process lubrication system of the current circulating rack cold continuous rolling unit as the optimized value of the process lubrication system until the circulation of S61 is finished.
The invention provides a comprehensive optimization method for a lubrication system of an ultrahigh-strength steel process of a six-stand cold continuous rolling unit, which comprises the following specific steps of: s1, collecting equipment parameters of a six-stand cold continuous rolling unit, set parameters of a rolling procedure in the cold continuous rolling process of the ultrahigh-strength steel and process lubrication system parameters; s2, defining a rolling stability control objective function of the upper surface and the lower surface of the strip steel, a lubricating difference control objective function of the upper surface and the lower surface of the strip steel, an emulsion cooling effect control objective function and a process lubricating system optimization comprehensive control objective function for rolling the ultrahigh-strength steel of the six-stand cold continuous rolling unit; s3, setting an initial value of an optimized comprehensive control objective function of a process lubrication system for rolling the ultrahigh-strength steel of the first six-stand cold continuous rolling unit, and setting an initial value of the process lubrication system of each stand; s4, taking the average lubricating oil film thickness on the upper surface of the strip steel of each rack in the technological lubrication system parameters of each rack close to a target value as an optimization target, and calculating a rolling stability control target function, a strip steel upper and lower surface lubrication difference control target function and an emulsion cooling effect control target function of the strip steel of each rack; s5, calculating the optimized distribution function of each rack according to the technological lubrication system parameters of each rack, and calculating the technological lubrication system optimized comprehensive control objective function of rolling the ultrahigh-strength steel of each rack tandem cold mill set by combining the optimized distribution function of each rack with the rolling stability control objective function of the upper surface and the lower surface of the strip steel of each rack, the lubricating difference control objective function of the upper surface and the lower surface of the strip steel and the emulsion cooling effect control objective function; s6, obtaining the optimal values of the technological lubrication system of each rack according to the technological lubrication system optimization comprehensive control objective function of the ultra-high-strength steel rolling of each rack cold continuous rolling unit, and outputting the optimal values of the technological lubrication system corresponding to each rack.
On the basis of on-site test tracking and theoretical research, the invention fully combines the equipment and process characteristics of the six-stand cold continuous rolling unit, analyzes the action and mechanism of emulsion, researches the relationship among the thickness and the friction coefficient of lubricating oil and the rolling stability, analyzes the influence of a process lubrication system on the rolling stability, and realizes the comprehensive control of the rolling stability of the upper surface and the lower surface of strip steel, the lubricating difference of the upper surface and the lower surface of the strip steel and the cooling effect of the emulsion.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and specific embodiments, and it is to be noted that the embodiments and features of the embodiments of the present application can be combined with each other without conflict.
Referring to fig. 1, an embodiment of the present invention provides a method for comprehensively optimizing a lubrication system of an ultra-high-strength steel process of a six-stand cold continuous rolling mill, including the following specific steps:
the first embodiment is as follows:
and S1, collecting equipment parameters of the six-stand cold continuous rolling unit, set parameters of the rolling procedure in the ultra-high strength steel cold continuous rolling process and process lubrication system parameters, and analyzing the action and mechanism of the emulsion by fully combining the equipment and process characteristics of the six-stand cold continuous rolling unit.
In this embodiment, the equipment parameters of the six-stand cold continuous rolling mill set mainly include the diameters of the working rolls, the intermediate rolls and the support rolls of each stand, and the roll body length of the working rolls, the roll body length of the intermediate rolls, the roll body length of the support rolls, the elastic modulus of the working rolls 210Gpa, the poisson ratio of the working rolls 0.3 and the maximum rolling force 2700t of each stand, wherein the roll body lengths and the roll diameters of the working rolls, the intermediate rolls and the support rolls of each stand are shown in table 1.
TABLE 1
In the embodiment, the set parameters of the rolling schedule in the cold continuous rolling process of the ultra-high strength steel mainly comprise average deformation resistance {602, 655, 745, 802, 851, 862} MPa of strip of each stand, speeds {320m/min, 415m/min, 530m/min, 640m/min, 645m/min, 650m/min }, transverse distribution values of incoming strip thickness {3.412mm, 3.412mm, 3.423mm, 3.451mm, 3.478mm, 3.501mm, 3.521mm, 3.498mm, 3.421mm }, incoming strip inlet thickness 3.505mm, outlet thicknesses of strip of six stands {2.683mm, 2.683mm, 2.460mm, 2.030mm, 1.813mm, 1.805mm }, and strip width 1120 mm.
In the embodiment, the technological lubrication system parameters mainly comprise a liquid lubrication friction influence coefficient of 0.0126, a dry friction influence coefficient of 0.0146, a friction coefficient attenuation index of-2.4297, an emulsion concentration influence coefficient of 1.836 and a viscosity compression coefficient of 0.01Mpa of a lubricant-1The dynamic viscosity of rolling oil is 0.02pags, the comprehensive influence coefficient of a process lubrication system is 0.86, the initial temperature of the emulsion is 51 ℃, the initial concentration of the emulsion is 5%, the influence coefficient of concentration is {1.21, 1.38}, the maximum concentration and the minimum concentration of the emulsion are { 15%, 2% }, and the initial temperature of the emulsion is the maximumSmall and maximum values {50 ℃, 62 ℃, minimum and maximum emulsion flow rates on individual stands {250L/min, 2000L/min }, minimum and maximum emulsion flow rates under individual stands {250L/min, 2000L/min }, emulsion flow rates on individual stands {1019L/min, 1123L/min, 1045L/min, 1205L/min, 1021L/min, 1178L/min }, average lubricant film thickness on and under rolling deformation zones {0.223um, 0.214um, 0.195um, 0.183um, 0.180um, 0.177um } {0.233um, 0.219um, 0.199um, 0.186um, 0.180um, 0.173um, and friction coefficients for rolling zones 0.132 on individual stands, 0.135, 0.122, 0.131, 0.123, 0.118} {0.122, 0.134, 0.132, 0.137, 0.121, 0.117}, the thickness of the slip critical lubricating film on the upper and lower surfaces of each strip of the frame {0.243um, 0.224um, 0.205um, 0.193um, 0.189um, 0.181um } {0.220um, 0.213um, 0.191um, 0.185um, 0.179um, 0.170um }, the thickness of the thermal slip critical lubricating film on the upper and lower surfaces of each strip of the frame {0.233um, 0.223um, 0.202um, 0.193um, 0.189um, 0.187um } {0.229um, 0.219um, 0.205um, 0.183um, 0.180um, 0.179um }.
S2, defining the rolling stability control objective functions of the upper surface and the lower surface of the strip steel as G respectivelywds(Xwds)、Gwdx(Xwdx) Setting value Xwds＝{C，trc，Ws}、Xwdx＝{C，trc，WxIn which XwdsIs a parameter variable, X, of a control objective function for the rolling stability of the upper surface of the strip steelwdxIs a parameter variable of a rolling stability control objective function of the lower surface of the strip steel, C is the concentration of the emulsion, trcIs the initial temperature of the emulsion, WsIs the upper emulsion flow, WxIs the lower emulsion flow.
Defining the control objective function of the lubrication difference of the upper surface and the lower surface of the strip steel as Gcy(Xcy) Wherein X iscyIs a parameter variable of a lubricating difference control objective function of the upper surface and the lower surface of the strip steel.
Defining the cooling effect control objective function of the emulsion as Glq(Xlq) Wherein X islqIs a parameter variable of an emulsion cooling effect control objective function.
Defining the technological lubrication system optimization comprehensive control objective function of the rolling of the ultrahigh-strength steel of the six-stand cold continuous rolling unit as Grz(Xrz) Wherein X isrzIs an optimized variable of a process lubrication system.
S3, setting an initial value G of a technological lubrication system optimization comprehensive control objective function for rolling the ultrahigh-strength steel of the first six-stand cold continuous rolling unitrz0＝105. Setting the initial values of the lubricating system of each rack process, including the optimization variable X of the lubricating system of each rack processrz＝{C，trc，Ws，WxThe optimization variables of each rack process lubrication system comprise four, namely emulsion concentration, initial temperature of emulsion, upper emulsion flow and lower emulsion flow, and four search step length delta X is given for the optimization variables of each rack process lubrication systemrz＝{ΔC＝0.1％，Δtrc＝0.1℃，ΔWs＝1L/min，ΔWx1L/min and search range:
wherein min represents the minimum value, max represents the maximum value, subscript i represents the number of the cold continuous rolling unit of the frame, Ci、tirc、Ws，i、Wx，iThe emulsion concentration, the initial temperature of the emulsion, the upper emulsion flow rate and the lower emulsion flow rate of each stand are respectively represented.
S4, taking the target value of the average lubricating oil film thickness of the upper surface of the strip steel of each rack in the process lubrication system parameters of each rack as an optimization target, wherein the average lubricating oil film thickness of the upper surface of the strip steel is the average value of the average lubricating oil film thickness of the rolling deformation area of each rack, the thickness of the slipping critical lubricating oil film of the upper surface of the strip steel of each rack and the thickness of the slipping critical lubricating oil film of the upper surface of the strip steel of each rack, and the target value is the average value of the thickness of the slipping critical lubricating oil film of the upper surface of the strip steel of each rack and the thickness of the slipping critical lubricating oil film of the upper surface of the strip steel of each rack.
Calculating the rolling stability control objective function of the upper surface of the strip steel of each frame as follows:
wherein alpha isξ0.4 is the unit integral stability control coefficient, xibxs，iIs the average lubricating film thickness, xi, of the rolling deformation zone on each standrhss，iIs the thickness of the critical lubricating oil film of the thermal sliding damage of the upper surface of each frame strip steel, (1-alpha)ξ) 0.6 is the maximum stability deviation control coefficient, ζdhs，iThe thickness of the slipping critical lubricating oil film on the upper surface of each frame strip steel.
Calculating the rolling stability control objective function of the lower surface of the strip steel of each frame as follows:
wherein ξbxx，iIs the average lubricating oil film thickness, xi, of the rolling deformation zone under each standrhsx，iIs the thickness of the thermal sliding damage critical lubricating oil film on the lower surface of each frame strip steeldhx，iThe thickness of the slipping critical lubricating oil film on the lower surface of the strip steel of each frame.
Calculating the control objective function of the lubricating difference of the upper surface and the lower surface of the strip steel as follows:
wherein, betaξ0.5 is the lubricating difference control coefficient of the upper and lower surfaces of the integral strip steel of the unit, (1-beta)ξ) The maximum lubrication difference control coefficient of the upper surface and the lower surface of the strip steel is 0.5.
Calculating the cooling effect control objective function of the emulsion as follows:
wherein λ iswqThe control coefficient of the whole cooling effect of the unit is (1-lambda) 0.4wq) 0.6 is the unit average cooling effect control coefficient, etalq，iAnd {0.6, 0.5, 0.6, 0.4, 0.5, 0.6} is the emulsion cooling effect coefficient of the i-th stand rolling process.
S5, calculating the optimized distribution function of each rack according to the technological lubrication system parameters of each rack, and calculating the technological lubrication system optimized comprehensive control objective function of rolling the ultra-high strength steel of each rack tandem cold rolling mill set by combining the optimized distribution function of each rack with the rolling stability control objective function of the upper surface and the lower surface of the strip steel of each rack, the lubricating difference control objective function of the upper surface and the lower surface of the strip steel and the emulsion cooling effect control objective function as follows:
Grz(X1rz)＝λ1Gwds(Xwds)+λ2Gwdx(Xwdx)+λ3Gcy(Xcy)+λ4Glq(Xlq)＝0.140
wherein, X1rzIs the optimized variable of the first rack process lubrication system, lambda10.3 is the comprehensive influence coefficient of the process lubrication system of the rolling stability control objective function of the upper surface of the strip steel; lambda [ alpha ]20.2 is the comprehensive influence coefficient of the process lubrication system of the rolling stability control objective function of the lower surface of the strip steel; lambda [ alpha ]30.1 is the comprehensive influence coefficient of the process lubrication system of the control objective function of the lubrication difference of the upper surface and the lower surface of the strip steel; lambda [ alpha ]40.4 is the comprehensive influence coefficient of the process lubrication system of the objective function of controlling the cooling effect of the emulsion
S6, obtaining the optimal values of the technological lubrication system of each rack according to the technological lubrication system optimization comprehensive control objective function of the ultra-high-strength steel rolling of each rack cold continuous rolling unit, and outputting the optimal values of the technological lubrication system corresponding to each rack. The method comprises the following specific steps:
s61, starting to circulate according to the number of the frame cold continuous rolling unitsJudging whether the process lubrication system optimization comprehensive control objective function of the ultra-high-strength steel rolling of the current circulating rack cold continuous rolling unit is smaller than the initial value G of the set process lubrication system optimization comprehensive control objective function of the ultra-high-strength steel rolling of the first six-rack cold continuous rolling unitirz＜Girz0If so, the former value is assigned to the latter Girz＝Girz00.140, and recording the value X of the technological lubrication system optimization variable of the current circulating frame cold continuous rolling unitirzy＝{Ciy，tircy，Ws，iy，Wx，iyIn which XirzyOptimizing variables of process lubrication system of current circulating frame cold continuous rolling unit, Ciy、tircy、Ws，iyAnd Wx，iyRespectively is the concentration optimization value of the emulsion of the cold continuous rolling unit of the current circulating frame, the initial temperature of the emulsion, the flow of the upper emulsion and the flow of the lower emulsion.
S62, starting circulation according to the number of the optimized variables of the process lubrication system, and judging whether the value of each optimized variable of the process lubrication system is smaller than the maximum value of the optimized variable of the current circulation process lubrication system, if so, then:
Zi＝Zi min+(kj+1)ΔXrz
wherein, i is 6, Z is the number of the cold continuous rolling units of the current circulating frameiThe optimized variables of the process lubrication system of the current circulating frame cold continuous rolling unit respectively comprise Ci、tirc、Ws，iAnd Wx，i，Zi minThe minimum value of the optimized variables of the process lubrication system of the current circulating frame cold continuous rolling unit respectively comprises
And
kj＝{k1，k2，k3，k4the {0, 0, 0, 0} is the number of the optimized variables of the lubrication system of the current circulation process, and delta Xrz＝{ΔCi，Δtirc，ΔWs，i，ΔWx，iAnd giving a search step length for an optimized variable of a process lubrication system. Thus, it is possible to provide
The above formula may also be:
s63, when the first circulation of the S62 is finished, taking the value of the optimized variable of the process lubrication system of the current circulating rack cold continuous rolling unit as the optimized value of the process lubrication system, and outputting the optimized value as follows:
X1rz＝{C1，t1rc，Ws，1，Wx，1}＝{5.7％，56.5℃，1067L/min，1135L/min}
until the S61 cycle is finished, the values of the process lubrication system optimization variables of the other five frame cold continuous rolling units are used as the process lubrication system optimization optimal values to be output as follows:
X2rz＝{C2，t2rc，Ws，2，Wx，2}＝{5.7％，56.5℃，1217L/min，1276L/min}
X3rz＝{C3，t3rc，Ws，3，Wx，3}＝{5.7％，56.5℃，1156L/min，1278L/min}
X4rz＝{C4，t4rc，Ws，4，Wx，4}＝{5.7％，56.5℃，1205L/min，1152L/min}
X5rz＝{C5，t5rc，Ws，5，Wx，5}＝{5.7％，56.5℃，1178L/min，1282L/min}
X6rz＝{C6，t6rc，Ws，6，Wx，6}＝{5.7％，56.5℃，1093L/min，1169L/min}。
example two:
parts of the second embodiment that are the same as the first embodiment are not described again, and the differences are as follows:
the initial temperature of the emulsion in this example was 50 ℃, the initial concentration of the emulsion was 2%, the emulsion flow rates on each stand and below {1029L/min, 1133L/min, 1069L/min, 1211L/min, 1032L/min, 1187L/min } {1029L/min, 1133L/min, 1069L/min, 1211L/min, 1032L/min, 1187L/min }, the average lubricating film thicknesses on each stand rolling and below rolling deformation zone {0.224um, 0.216um, 0.199um, 0.185um, 0.182um, 0.179um } {0.231um, 0.216um, 0.194um, 0.185um, 0.175um, 0.170um }, the respective friction systems on each stand rolling and below rolling deformation zone {0.133, 0.134, 0.123, 0.133, 0.124, 0.128 um }, 0.125 um, 0.125, 0.131, 0.122 um }, the respective critical lubricating film thicknesses on each stand { 0.115, 129, 0.115 um },129,129,129,136 and the respective critical lubricating film thicknesses of the upper and lower surface of the strip steel strip, 0.234um, 0.216um, 0.199um, 0.185um, 0.179um } {0.226um, 0.211um, 0.195um, 0.189um, 0.177um, 0.170um }, critical lubricating film thickness {0.231um, 0.226um, 0.206um, 0.194um, 0.188um, 0.186um } {0.225um, 0.216um, 0.209um, 0.188um, 0.180um, 0.175um }.
Optimization variable X of initial each rack process lubrication systemrz＝{C，trc，Ws，Wx}＝{2％，50℃，1029L/min，1029L/min}。
Calculating the rolling stability control objective function of the upper surface of the strip steel of each frame as follows:
calculating the rolling stability control objective function of the lower surface of the strip steel of each frame as follows:
calculating the control objective function of the lubricating difference of the upper surface and the lower surface of the strip steel as follows:
calculating the cooling effect control objective function of the emulsion as follows:
wherein, the emulsion cooling effect coefficient eta of the ith frame rolling processlq，i＝{0.5，0.4，0.5，0.6，0.6，0.4}。
Calculating the optimized comprehensive control objective function of the process lubrication system for rolling the ultrahigh-strength steel of each rack cold continuous rolling unit as follows:
Grz(X1rz)＝λ1Gwds(Xwds)+λ2Gwdx(Xwdx)+λ3Gcy(Xcy)+λ4Glq(Xlq)＝0.136
and finally, outputting the values of the optimized variables of the process lubrication system of each rack cold continuous rolling unit as the optimized values of the process lubrication system as follows:
X1rz＝{C1，t1rc，Ws，1，Wx，1}＝{5.9％，55.2℃，1076L/min，1145L/min}
X2rz＝{C2，t2rc，Ws，2，Wx，2}＝{5.9％，55.2℃，1227L/min，1267L/min}
X3rz＝{C3，t3rc，Ws，3，Wx，3}＝{5.9％，55.2℃，1136L/min，1275L/min}
X4rz＝{C4,t4rc,Ws,4,Wx,4}＝{5.9％，55.2℃，1215L/min，1157L/min}
X5rz＝{C5,t5rc,Ws,5,Wx,5}＝{5.9％，55.2℃，1169L/min，1270L/min}
X6rz＝{C6,t6rc,Ws,6,Wx,6}＝{5.7％，56.5℃，1088L/min，1178L/min}
in the description above, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore should not be construed as limiting the scope of the present invention.
In conclusion, although the present invention has been described with reference to the preferred embodiments, it should be noted that various changes and modifications can be made by those skilled in the art, and they should be included in the scope of the present invention unless they depart from the scope of the present invention.
Claims (10)
1. The comprehensive optimization method of the ultra-high strength steel process lubrication system of the six-stand cold continuous rolling unit is characterized by comprising the following specific steps of:
s1, collecting equipment parameters of a six-stand cold continuous rolling unit, set parameters of a rolling procedure in the cold continuous rolling process of the ultrahigh-strength steel and process lubrication system parameters;
s2, defining a rolling stability control objective function of the upper surface and the lower surface of the strip steel, a lubricating difference control objective function of the upper surface and the lower surface of the strip steel, an emulsion cooling effect control objective function and a process lubricating system optimization comprehensive control objective function for rolling the ultrahigh-strength steel of the six-stand cold continuous rolling unit;
s3, setting an initial value of an optimized comprehensive control objective function of a process lubrication system for rolling the ultrahigh-strength steel of the first six-stand cold continuous rolling unit, and setting an initial value of the process lubrication system of each stand;
s4, taking the condition that the average lubricating oil film thickness of the upper surface of strip steel in the process lubrication system parameters of each rack is close to a target value as an optimization target, and calculating a rolling stability control target function of the upper surface and the lower surface of the strip steel of each rack, a lubricating difference control target function of the upper surface and the lower surface of the strip steel and an emulsion cooling effect control target function;
s5, calculating the optimized distribution function of each rack according to the technological lubrication system parameters of each rack, and calculating the technological lubrication system optimized comprehensive control objective function of rolling the ultrahigh-strength steel of each rack tandem cold mill set by combining the optimized distribution function of each rack with the rolling stability control objective function of the upper surface and the lower surface of the strip steel of each rack, the lubricating difference control objective function of the upper surface and the lower surface of the strip steel and the emulsion cooling effect control objective function;
s6, obtaining the optimal values of the technological lubrication system of each rack according to the technological lubrication system optimization comprehensive control objective function of the ultra-high-strength steel rolling of each rack cold continuous rolling unit, and outputting the optimal values of the technological lubrication system corresponding to each rack.
2. The method for comprehensively optimizing the process lubrication system of the ultra-high strength steel of the six-stand cold continuous rolling mill set according to claim 1, wherein the collected process lubrication system parameters in the step S1 mainly include the influence coefficient of emulsion concentration, the dynamic viscosity of rolling oil, the comprehensive influence coefficient of process lubrication system, the initial temperature of emulsion, the initial concentration of emulsion, the maximum concentration and minimum concentration of emulsion, the minimum and maximum initial temperature of emulsion, the minimum and maximum flow rate of emulsion on each stand, the minimum and maximum flow rate of emulsion under each stand, the average thickness of lubricating oil film in rolling deformation zone on each stand, the corresponding friction coefficient in rolling deformation zone under each stand, the thickness of slip critical lubricating oil film on the upper surface and the lower surface of strip steel of each stand, and the thickness of the average thickness of lubricating oil film on each stand, The thickness of the critical lubricating oil film of the upper surface and the lower surface of the strip steel of each frame is thermally slipped.
3. The comprehensive optimization method for the ultra-high strength steel process lubrication system of the six-stand cold continuous rolling mill unit as claimed in claim 2, wherein in the step S3, the initial values of the process lubrication systems of the respective stands are set, including the initial optimization variables of the process lubrication systems of the respective stands, and the search step length and the search range are given for the optimization variables of the process lubrication systems of the respective stands, and the optimization variables of the process lubrication systems of the respective stands include four, which are the emulsion concentration, the initial temperature of the emulsion, the upper emulsion flow rate and the lower emulsion flow rate, respectively.
4. The comprehensive optimization method for the process lubrication system of the ultra-high strength steel of the six-stand cold continuous rolling mill train as claimed in claim 1, wherein in the step S4, the average thickness of the lubricating oil film on the upper surface and the lower surface of each stand strip steel comprises the average thickness of the lubricating oil film in the rolling deformation area on each stand and the rolling deformation area on the lower surface of each stand strip steel, the thickness of the slipping critical thickness of the lubricating oil film on the upper surface and the lower surface of each stand strip steel and the thickness of the thermal slipping critical thickness of the lubricating oil film on the upper surface and the lower surface of each stand strip steel.
5. The comprehensive optimization method for the process lubrication system of the ultra-high strength steel of the six-stand cold continuous rolling mill set according to claim 4, wherein in the step S4, the average thickness of the lubricating oil film on the upper surface of the strip steel is an average value of the average thickness of the lubricating oil film in the rolling deformation region of each stand, the thickness of the critical lubricating oil film on the upper surface of the strip steel of each stand and the thickness of the critical lubricating oil film on the upper surface of the strip steel of each stand, and the target value is an average value of the thickness of the critical lubricating oil film on the upper surface of the strip steel of each stand and the thickness of the critical lubricating oil film on the upper surface of the strip steel of each stand.
6. The comprehensive optimization method for the ultra-high strength steel process lubrication system of the six-stand cold continuous rolling mill unit according to claim 3 or 5, wherein in the step of S4, the rolling stability control objective function of the upper surface of each stand strip steel is calculated as follows:
wherein G iswdsIs a control objective function, X, of the rolling stability of the upper surface of the strip steelwdsIs a parameter variable of a rolling stability control objective function of the upper surface of the strip steel, and subscript i is the number of the cold continuous rolling unit of the stand and alphaξIs the unit overall stability control coefficient, xibxs，iIs the average lubricating film thickness, xi, of the rolling deformation zone on each standrhss，iIs the thickness of the critical lubricating oil film of the thermal sliding damage of the upper surface of each frame strip steel, (1-alpha)ξ) 0.6 is the maximum stability deviation control coefficient, ξdhs，iThe thickness of the slipping critical lubricating oil film on the upper surface of each frame strip steel.
Calculating the rolling stability control objective function of the lower surface of the strip steel of each frame as follows:
wherein G iswdxIs a control objective function, X, of the rolling stability of the lower surface of the strip steelwdxIs a parameter variable xi of a rolling stability control objective function of the lower surface of the strip steelbxx，iIs the average lubricating oil film thickness, xi, of the rolling deformation zone under each standrhsx，iIs the thickness of the thermal sliding damage critical lubricating oil film on the lower surface of each frame strip steeldhx，iThe thickness of the slipping critical lubricating oil film on the lower surface of the strip steel of each frame.
7. The comprehensive optimization method for the ultra-high strength steel process lubrication system of the six-stand cold continuous rolling mill unit according to claim 6, wherein in the step S4, the control objective functions for the lubrication difference of the upper and lower surfaces of the strip steel are calculated as follows:
wherein G iscyIs a control objective function of the lubricating difference of the upper and lower surfaces of the strip steel, XcyThe difference of the lubrication of the upper surface and the lower surface of the strip steelParameter variable, beta, of a sexual control objective functionξThe lubricating difference control coefficient of the upper surface and the lower surface of the integral strip steel of the unit is (1-beta)ξ) The maximum lubrication difference control coefficient of the upper surface and the lower surface of the strip steel.
8. The comprehensive optimization method for the ultra-high strength steel process lubrication system of the six-stand cold continuous rolling mill unit according to claim 7, wherein in the step S4, the control objective function for the cooling effect of the emulsion is calculated as follows:
wherein G islqIs an emulsion cooling effect control objective function, XlqIs a parameter variable, lambda, of an emulsion cooling effect control objective functionwqIs the unit integral cooling effect control coefficient (1-lambda)wq) Is the unit average cooling effect control coefficient, etalq，iIs the emulsion cooling effect coefficient in the i-th frame rolling process.
9. The comprehensive optimization method for the technological lubrication system of the ultrahigh-strength steel of the six-stand cold continuous rolling mill unit according to claim 8, wherein the calculation of the technological lubrication system optimization comprehensive control objective function for the ultrahigh-strength steel rolling of each stand cold continuous rolling mill unit is as follows:
Grz(Xrz)＝λ1Gwds(Xwds)+λ2Gwdx(Xwdx)+λ3Gcy(Xcy)+λ4Glq(Xlg)
wherein G isrzIs an optimized comprehensive control objective function of a process lubrication system for rolling ultrahigh-strength steel of a cold continuous rolling unit, XrzIs a parameter variable, lambda, of a process lubrication system optimization comprehensive control objective function for rolling the ultrahigh-strength steel of the cold continuous rolling mill set1Is the comprehensive influence coefficient of the process lubrication system of the rolling stability control objective function of the upper surface of the strip steel; lambda [ alpha ]2Is a control target for rolling stability of the lower surface of the strip steelComprehensive influence coefficient of the process lubrication system of the function; lambda [ alpha ]3The comprehensive influence coefficient of the process lubrication system of the lubricating difference control objective function of the upper surface and the lower surface of the strip steel is shown; lambda [ alpha ]4Is the comprehensive influence coefficient of the process lubrication system of the emulsion cooling effect control objective function.
10. The comprehensive optimization method for the ultra-high strength steel process lubrication system of the six-stand cold continuous rolling mill unit according to claim 9, wherein in the step S6, the optimized optimal value of the process lubrication system of each stand is obtained according to the optimized comprehensive control objective function for the process lubrication system of the ultra-high strength steel rolling of each stand cold continuous rolling mill unit, and the optimized optimal value of the process lubrication system corresponding to each stand is output, and the specific steps are as follows:
s61, starting circulation according to the number of the stand cold continuous rolling units, judging whether a process lubrication system optimized comprehensive control objective function for rolling the ultrahigh-strength steel of the current circulating stand cold continuous rolling unit is smaller than an initial value of a set process lubrication system optimized comprehensive control objective function for rolling the ultrahigh-strength steel of a first six-stand cold continuous rolling unit, if so, assigning the former value to the latter, and recording the value of a process lubrication system optimized variable of the current circulating stand cold continuous rolling unit;
s62, starting circulation according to the number of the optimized variables of the process lubrication system, and judging whether the value of each optimized variable of the process lubrication system is smaller than the maximum value of the optimized variable of the current circulation process lubrication system, if so, then:
Zi＝Zi min+(kj+1)ΔXrz
wherein, subscript i is the number of the cold continuous rolling units of the current circulating frame, ZiOptimizing variables, Z, for the process lubrication system of the current circulating frame cold continuous rolling uniti minOptimizing the minimum value of the variable, k, of the technological lubrication system of the current circulating frame cold continuous rolling unitjNumber of variables, Δ X, optimized for the current cycle process lubrication regimerzSetting a search step length for an optimized variable of a process lubrication system;
and S63, when the circulation of S62 is finished, outputting the value of the optimized variable of the process lubrication system of the current circulating rack cold continuous rolling unit as the optimized value of the process lubrication system until the circulation of S61 is finished.
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