CN115502220A - Optimization setting method for surface roughness of high-temperature material roller of double-stand temper mill - Google Patents

Optimization setting method for surface roughness of high-temperature material roller of double-stand temper mill Download PDF

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CN115502220A
CN115502220A CN202110701675.9A CN202110701675A CN115502220A CN 115502220 A CN115502220 A CN 115502220A CN 202110701675 A CN202110701675 A CN 202110701675A CN 115502220 A CN115502220 A CN 115502220A
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strip
rolling
roughness
frame
coefficient
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王涛
王孝建
徐烨明
王天顺
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Shanghai Meishan Iron and Steel Co Ltd
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Shanghai Meishan Iron and Steel Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/02—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring flatness or profile of strips

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Abstract

The invention relates to a method for optimally setting the surface roughness of a high-temperature material roller of a double-frame temper mill, which comprises the following steps of: a) collecting the characteristic parameters of the equipment of the double-frame temper mill, B) collecting the key rolling technological parameters of the strip to be comprehensively set as the parameters of the metal model, C) collecting the characteristic parameters of the technological process, namely the target roughness of the strip
Figure DDA0003129945500000011
D) Taking rolling kilometers of 0-L km length, and taking N on the strip steel 0 Point, setting the original roughness R 'of the roller surface' a0 ，R” a0 (ii) a E) Setting an initial value of N, and enabling N =1; f) Calculating the surface roughness Ra of the roller when rolling the N point strip steel N ，
Figure DDA0003129945500000012
L 0 The number of currently rolled kilometers; g) Thickness xi of oil film from leveling liquid i And the relation between the rolling process parameters and the like optimizes the finished strip steel meeting the requirements of the temper mill on the plate shape and the roughness by setting the original surface roughness of the roller, and has important guiding significance for optimizing and controlling the plate shape and the roughness in the field strip steel production.

Description

Optimization setting method for surface roughness of high-temperature material roller of double-frame leveling unit
Technical Field
The invention relates to an optimal setting method, in particular to an optimal setting method for the surface roughness of a high-temperature material roller of a double-stand temper mill, and belongs to the technical field of cold rolling.
Background
With the promotion of intelligent manufacturing and industrial transformation and upgrading, the requirements of a large number of users on the performance of the product are gradually improved while the demand of the users on the strip steel is increased, and the stable rolling and the improvement of the shape and the surface quality of the finished strip steel are very important for a temper mill set. The surface roughness of the strip steel of the temper mill set is mainly controlled by regulating and controlling the surface roughness of the working roll, the surface characteristics of the working roll can be impressed on the surface of the strip steel in the temper rolling process, and users with different requirements have different requirements on the surface roughness of the strip steel, so that good control is required according to the requirements of the users during production. Through setting an original roughness value to the working roll before putting on the computer, after temper rolling begins, along with rolling the constantly increasing of kilometer number, the roughness on working roll surface receives the effect of rolling force and inherits the finished product belted steel surface gradually, and this in-process roll coefficient of surface friction can reduce gradually, owing to receive the effect of levelling liquid simultaneously, the coefficient of friction between working roll and the belted steel can further reduce, and then causes bad influence to finished product belted steel plate shape and roughness. Particularly, in the temper rolling of high-temperature materials, it is necessary to successfully inherit the roughness of the work rolls to the surface of the strip, adjust the rolling pressure to maintain a suitable elongation, and stabilize the rolling. That is, the original surface roughness of the roller affects the control of rolling stability and the quality of finished strip steel in the high-temperature material leveling process. In the past, the temper rolling of the high-temperature material of the double-frame and the surface roughness of the strip steel are not controlled by the original roughness of the surface of the roller, so that how to reasonably set the original surface roughness of the roller, maintain the temper rolling stability of the high-temperature material and improve the surface quality of the finished strip steel becomes a key point of field production research.
Disclosure of Invention
The invention provides a method for optimally setting the surface roughness of a high-temperature material roller of a double-frame temper mill, aiming at the problems in the prior art, and for the double-frame temper mill, control parameters of the roughness of outlet strip steel comprise the roughness of a 1# frame working roller, the roughness of a 2# frame working roller, the roughness of incoming materials, 1# rolling force and 2# rolling force. In the prior art, in the production process of a double-frame temper mill set, only the roughness of a 1# frame working roll and the roughness of a 2# frame working roll are often set, and the influence of rolling force is not considered. In fact, the deformation resistance of the high-temperature material is small, the elongation of the strip steel is influenced by the setting of the rolling force in the rolling process, the elongation of the high-temperature material is too large due to the fact that the large setting of the rolling force, but the rolling is unstable if the setting of the rolling force is small. Therefore, through a large amount of field tests and theoretical researches, the equipment and process characteristics of the double-rack temper mill are fully combined, the target of controlling the shape and the roughness deviation of the strip steel at the outlet is taken, and meanwhile, the minimum value of the rolling force which is greater than the stable rolling in the rigidity curve of the rolling mill is taken as a constraint condition, so that the optimal setting value of the original surface roughness of the roller is optimized.
In order to achieve the purpose, the technical scheme of the invention is that the method for optimally setting the surface roughness of the high-temperature material roller of the double-frame temper mill comprises the following steps:
a) Collecting the equipment characteristic parameters of a double-frame leveling machine set, mainly comprising: diameter D of 1# frame work roll of steel grade w1 Diameter D of 2# frame working roll w2 Convexity of working roll, length L of working roll body and length L of supporting roll body 1 ，L 2 And the machining roughness R of the 1# frame working roll a1 And the machining roughness R of the working roll of the No. 2 frame a2 1# frame working roll rolling kilometer number L 1# L kilometer in rolled 2# working rolls 2# Minimum allowable rolling force P of 1# frame in rolling mill stiffness curve 1min Allowable maximum value P of rolling force of No. 2 frame 2min ；
B) Collecting the key rolling process parameters of the strip to be comprehensively set with the metal model parameters, which mainly comprises the following steps: transverse thickness distribution H of incoming strip i Elongation distribution coefficient, rolling speed V, strip tension T 0 、T 1 、T 2 And a strip width B.
C) Collecting process characteristic parameters, i.e. target roughness of strip
Figure RE-GDA0003322481060000021
D) Taking rolling kilometers of 0-L km length, and taking N on the strip steel 0 Point, setting the original roughness R of the surface of the roller a0 The original roughness of the primary frame and the secondary frame is R' a0 ，R″ a0 ；
E) Setting an initial value of N, and enabling N =1;
f) Calculating the roughness of the surface of the roller when rolling the Nth point strip steel
Figure RE-GDA0003322481060000022
r represents the number of racks, L 0 For the current number of rolled kilometers, in which B l For the roughness attenuation coefficient of the roller, a large amount of field data can be collected, the roughness attenuation coefficient of the current unit is obtained by a regression processing method, and B is taken l ＝1.3×10 -4 ～1.5×10 -4 ；
G) Thickness xi of oil film from leveling liquid i And rolling process parameters, and calculating the thickness xi 'of the flattening liquid oil film at the Nth point of the strip steel' N Wherein:
Figure RE-GDA0003322481060000023
(in the formula: h) 0N 、h 1N Represents the thickness of the strip inlet of the No. 1#2 frame; k is a radical of c Expressing the influence coefficient of the concentration of the emulsion; theta represents the viscosity compressibility of the emulsion; eta 0 Represents the emulsion dynamic viscosity; v 0N 、V 1N Representing the strip steel inlet speed of a No. 1#2 stander; alpha is alpha N Indicating a bite angle; k is an inlet strip steelResistance to form; k is a radical of rg The coefficient of the intensity of the lubricant carried in the longitudinal roughness of the surfaces of the working roll and the strip steel; k is a radical of rs Indicating the impression rate, i.e. the rate at which the surface roughness of the working roll is transferred to the strip)
H) Calculating the friction coefficient mu of rolling at the current position N Mu of therein' N 、μ″ N Representing the friction coefficient of rolling on the first and second stands,
Figure RE-GDA0003322481060000024
wherein a is a liquid friction coefficient, and b is a dry friction influence coefficient;
i) Calculating the rolling force P on two stands under the current working condition 1 ，P 2 (ii) a P = f · L; wherein f is a unit rolling force,
Figure RE-GDA0003322481060000031
l is the contact arc length of the roller and the strip in the rolling deformation zone,
Figure RE-GDA0003322481060000032
b is the strip width, a 0 、a 1 For levelling the steel grade and the coefficient of influence of the working conditions, sigma p Is equivalent deformation resistance, σ p ＝k 3 ·(σ s +a·lg1000·e)-(k 1 ·T 1 +k 2 ·T 0 ) D is the diameter of the working roll, epsilon is the elongation of the strip, mu is the coefficient of friction, h 0 Is the strip entry thickness, e is the rate of deformation, k 1 、k 2 As a front-to-back tension weighting coefficient, k 3 As coefficient of influence of deformation resistance, σ s Is the strip yield strength, a is the strain rate coefficient;
j) Judging the rolling force P of the two frames 1 ，P 2 Whether the minimum value of the rolling force for satisfying stable rolling in the stiffness curve of the rolling mill, namely P, is satisfied 1 ＞P 1min And P is 2 ＞P 2min . If the judgment condition is met, the step I) is immediately carried out, if the judgment condition is not met, the step D) is returned to a0 ；
K) Calculating conditions determined at incoming materialLower, the front tension of the finished strip is transversely distributed; the front tension lateral profile can be expressed as:
Figure RE-GDA0003322481060000033
wherein σ 1 (x) For the unit tension, σ, of each point in the transverse direction of the strip 1 For the exit side total tension, B is the strip width,
Figure RE-GDA0003322481060000034
is the average thickness of the strip outlet, h (x) is the transverse distribution value of the thickness of the strip outlet,
Figure RE-GDA0003322481060000035
h (x) is the average thickness of the strip entrance, H (x) is the transverse distribution value of the thickness of the strip entrance, L is the average length value representing the shape of the incoming strip, L (x) is the transverse distribution value representing the shape of the incoming strip, and delta u' is the transverse distribution function of the transverse displacement increment of the strip;
l) calculating a unit outlet plate shape value I under the current rolling pressure,
Figure RE-GDA0003322481060000036
E. v is the Young's modulus and Poisson's ratio, σ, of the work roll 1i For transverse distribution of front tension, σ 1 Is a front tension value;
m) calculating the surface roughness R' of the finished product strip steel at the point with N =1 aN ；
N) judgment of N>N 0 Is there a If the condition is not satisfied, making N = N +1, returning to the step E), calculating the roughness and the plate shape value of the next point, and if the condition is satisfied, immediately entering the step M);
o) order
Figure RE-GDA0003322481060000037
As an objective function, wherein I is the number of transverse strip elements of the strip steel, I i The distribution value of the strip shape of each strip in the transverse direction of the strip steel, alpha 1 、α 2 Beta, gamma are weighting coefficients, where alpha is taken 1 ＝0.25、α 2 ＝0.25、β＝0.3、γ＝0.1；
P) the minimum value of the objective function F (X) is found by the Powell method. If the result meets Powell conditions, entering the step O) immediately, otherwise, returning to the step C) to search new data points;
q) outputting the original roughness set value of the roller surface meeting the conditions, and finishing the optimization process.
Compared with the prior art, the method has the advantages that the method fully considers the characteristics of small rolling deformation resistance and difficult control of elongation of the high-temperature material through summarizing the production parameters of the high-temperature material of the double-frame temper mill, takes the shape, roughness deviation and rolling stability factors of the outlet strip as target functions, and takes the condition that the rolling force is greater than the minimum stable rolling value as a constraint condition. The finished product strip steel meeting the requirements of the shape and the roughness of the temper mill set is optimized by setting the original surface roughness of the roller, and the method has important guiding significance for optimizing and controlling the shape and the roughness in the field strip steel production.
Through the application of the scheme in the field test stage, the shape and the surface roughness of the finished strip steel more accord with the requirements of users, and the deviation comparison condition of the shape and the surface roughness of the finished strip steel and the set roughness before and after the scheme is applied is listed through the table 1, so that the scheme has obvious effects on controlling the surface roughness of the finished strip steel and optimizing the shape, and the yield and the production benefit of the strip steel are greatly improved.
Table 1 statistics of finished strip shape and roughness before and after this scheme application test
Figure RE-GDA0003322481060000041
Drawings
FIG. 1 is a general flow diagram of the present invention.
The specific implementation mode is as follows:
for the purpose of promoting an understanding of the present invention, reference will now be made in detail to the present embodiments of the invention, examples of which are illustrated in the accompanying drawings.
Example 1: referring to fig. 1, a method for optimally setting the surface roughness of a high-temperature material roller of a double-stand temper mill set comprises the following steps:
a) Collect the equipment characteristic parameter of two frame leveling units, mainly include: diameter D of 1# frame work roll of steel grade w1 Diameter D of 2# frame working roll w2 Convexity of working roll, length L of working roll body and length L of supporting roll body 1 ，L 2 And the machining roughness R of the working roll of the 1# frame a1 And the machining roughness R of the 2# frame working roll a2 1# frame working roll rolling kilometer number L 1# 2# working roll with kilometer number L 2# Minimum allowable rolling force P of 1# frame in rolling mill stiffness curve 1min Allowable maximum value P of rolling force of No. 2 frame 2min ；
B) Collecting the key rolling process parameters of the strip to be comprehensively set as the parameters of the metal model, and mainly comprising the following steps of: transverse thickness distribution H of incoming strip i Elongation distribution coefficient, rolling speed V, strip tension T 0 、T 1 、T 2 And a strip width B.
C) Collecting process characteristic parameters, i.e. target roughness of strip
Figure RE-GDA0003322481060000042
D) Taking rolling kilometers of 0-L km length, and taking N on the strip steel 0 Point, setting the original roughness R of the surface of the roller a0 The original roughness of the primary frame and the secondary frame is R' a0 ，R″ a0 ；
E) Setting an initial value of N, and enabling N =1;
f) Calculating the surface roughness Ra of the roller when rolling the Nth point strip steel N ，
Figure RE-GDA0003322481060000051
L 0 The number of currently rolled kilometers; in the formula B l For the roll roughness attenuation coefficient, a large amount of field data can be collected, the roughness attenuation coefficient of the current unit is obtained by a regression processing method, and B is taken l ＝1.3×10 -4 ～1.5×10 -4 ；；
G) Thickness xi of oil film from leveling liquid i And rolling process parameters, and calculating the thickness xi 'of the flattening liquid oil film at the Nth point of the strip steel' N Wherein:
Figure RE-GDA0003322481060000052
(in the formula: h) 0N 、h 1N Represents the thickness of the strip steel inlet of the No. 1#2 stander; k is a radical of c Expressing the influence coefficient of the concentration of the emulsion; theta represents the viscosity compressibility of the emulsion; eta 0 Represents the emulsion dynamic viscosity; v 0N 、V 1N Representing the strip steel inlet speed of a No. 1#2 stander; alpha is alpha N Indicating a bite angle; k is the deformation resistance of the inlet strip steel; k is a radical of rg The coefficient of the intensity of the longitudinal roughness entrainment lubricant on the surfaces of the working roll and the strip steel; k is a radical of formula rs Indicating the impression rate, i.e. the rate at which the surface roughness of the working roll is transferred to the strip
H) Calculating the friction coefficient mu of rolling at the current position N Mu of therein' N 、μ″ N Representing the friction coefficient of rolling on the first and second stands,
Figure RE-GDA0003322481060000053
wherein a is a liquid friction coefficient and b is a dry friction influence coefficient;
i) Calculating the rolling force P on the two stands of the rolling pressure under the current working condition 1 ，P 2 (ii) a P = f · L; wherein f is a unit rolling force,
Figure RE-GDA0003322481060000054
l is the contact arc length of the roller and the strip in the rolling deformation zone,
Figure RE-GDA0003322481060000055
b is the strip width, a 0 、a 1 For levelling the steel grade and the coefficient of influence of the working conditions, sigma p Is equivalent deformation resistance, σ p ＝k 3 ·(σ s +a·lg1000·e)-(k 1 ·T 1 +k 2 ·T 0 ) D is a workDiameter of the working roll,. Epsilon.is elongation of the strip,. Mu.is coefficient of friction, h 0 Is the strip entry thickness, e is the rate of deformation, k 1 、k 2 Is a front-to-back tension weighting coefficient, k 3 As coefficient of influence of deformation resistance, σ s Is the strip yield strength, a is the strain rate coefficient;
j) Judging the rolling force P of the two frames 1 ，P 2 Whether the minimum value of the rolling force for satisfying stable rolling in the stiffness curve of the rolling mill, namely P, is satisfied 1 ＞P 1min And P is 2 ＞P 2min . If the judgment condition is met, the step I) is immediately carried out, if the judgment condition is not met, the step D) is returned to a0 ；
K) Calculating the transverse distribution of the front tension of the finished strip under the condition of determining the incoming material; the front tension lateral profile can be expressed as:
Figure RE-GDA0003322481060000061
wherein σ 1 (x) For each point unit tension, sigma, in the transverse direction of the strip to be discharged 1 For the exit side total tension, B is the strip width,
Figure RE-GDA0003322481060000062
is the average thickness of the strip outlet, h (x) is the transverse distribution value of the thickness of the strip outlet,
Figure RE-GDA0003322481060000063
h (x) is the average thickness of the strip inlet, L is the average length value of the incoming strip shape, L (x) is the transverse length value of the incoming strip shape, and delta u' is the transverse strip displacement increment distribution function;
l) calculating a unit outlet plate shape value I under the current rolling pressure,
Figure RE-GDA0003322481060000064
E. v is the Young's modulus and Poisson's ratio, σ, of the work roll 1i For transverse distribution of front tension, σ 1 Is a front tension value;
m) calculating the point of N =1Surface roughness R' of product strip steel aN ；
N) judgment of N>N 0 Is there a If the condition is not satisfied, making N = N +1, returning to the step E), calculating the roughness and the plate shape value of the next point, and if the condition is satisfied, immediately entering the step M);
o) order
Figure RE-GDA0003322481060000065
As an objective function, wherein I is the number of transverse strip elements of the strip steel, I i For the strip shape distribution value, alpha, of each strip in the transverse direction of the strip 1 、α 2 Beta, gamma are weighting coefficients, where alpha is taken 1 ＝0.25、α 2 ＝0.25、β＝0.3、γ＝0.1；
P) the minimum of the objective function F (X) is found by the Powell method. If the result meets Powell conditions, entering the step O) immediately, otherwise, returning to the step C) to search a new data point;
q) outputting the original roughness set value of the roller surface meeting the conditions, and finishing the optimization process.
Specific example 1: a method for optimally setting the surface roughness of a high-temperature material roller of a double-stand temper mill set comprises the following steps:
a) Collecting the equipment characteristic parameters of a double-frame leveling machine set, mainly comprising: diameter D of T4,1# frame working roll of steel grade w1 =450mm, 2# frame work roll diameter D w2 Work roll convexity 0.06mm, length L of work roll and support roll body 1 ＝1450mm，L 2 Machine roughness R of 1# frame working roll of =1450mm a1 Roughness R on machine of 2# machine frame working roll with =1.56 mu m a2 Rolling kilometers L of 1# frame working roll with =0.52 μm 1# Kilometer L in 2# working roll milling 5km 2# Minimum value P of allowable rolling force of 1# stand in stiffness curve of rolling mill in 5km 1min Allowable minimum value P of rolling force of 2# frame with =5000KN 2min ＝2000KN；
B) Collecting the key rolling process parameters of the strip to be comprehensively set as the parameters of the metal model, and mainly comprising the following steps of: transverse thickness distribution of incoming strip
Figure RE-GDA0003322481060000066
The distribution coefficient of elongation is 0.72, the rolling speed V =120m/min and the tension T of the strip 0 ＝93KN、T 1 ＝120KN、T 2 =68KN, strip width B =890mm.
C) Collecting process characteristic parameters, i.e. target roughness of strip
Figure RE-GDA0003322481060000071
D) Taking the number of rolled kilometers of 0-10 km length, taking 200 points on the strip steel, and setting the original roughness R 'of the surface of the roller' a0 ＝1.4μm，R″ a0 ＝0.5μm；
E) Setting an initial value of N, and enabling N =1;
f) Calculating the surface roughness Ra of the roller when rolling the 1 st point strip steel 1 ，Ra 1 ＝Ra 0 ·e -0.0018 ；
G) Thickness xi of oil film from leveling liquid i And rolling process parameters, and calculating the thickness xi 'of the leveling liquid oil film at the 1 st point of the strip steel' 1 ，ξ″ 1 ；
H) Calculating the friction coefficient mu 'rolled on the two stands at the current position' 1 ＝0.6，μ″ 1 ＝0.4；
I) Calculating the rolling force P on two stands under the current working condition 1 ＝6954KN，P 2 ＝2869KN；
J) The rolling force P of the two stands can be seen 1 ＞P 1min ，P 2 ＞P 2min If the minimum value of the rolling force which meets the requirement of stable rolling in the rigidity curve of the rolling mill is met, entering the step I);
k) Calculating the front tension transverse distribution sigma of the finished strip under the determined conditions of the incoming material 1 (x)；
L) calculating a unit outlet plate shape value I =4.5 under the current rolling pressure;
m) calculating the surface roughness R' of the finished product strip steel at the point with N =1 a1 ＝0.39；
N)N<N 0 EstablishedEntering step M);
o) order
Figure RE-GDA0003322481060000072
As an objective function, wherein I is the number of transverse strip elements of the strip steel, I i For the strip shape distribution value, alpha, of each strip in the transverse direction of the strip 1 、α 2 Beta, gamma are weighting coefficients, where alpha is taken 1 ＝0.25、α 2 ＝0.25、β＝0.3、γ＝0.1；
P) the minimum of the objective function F (X) is found by the Powell method. If the result meets Powell conditions, entering the step O) immediately, otherwise, returning to the step C) to search a new data point;
q) performing cyclic calculation on multiple groups of data, and finally, outputting a set value R of the original roughness of the surface of the roller meeting the conditions in step P) a1 ＝1.66μm、R a2 ＝0.58μm。
Specific example 2: a method for optimally setting the surface roughness of a high-temperature material roller of a double-stand temper mill set comprises the following steps:
a) Collect the equipment characteristic parameter of two frame leveling units, mainly include: diameter D of T4,1# frame working roll of steel grade w1 =460mm, 2# frame work roll diameter D w2 Work roll length L of 550mm, work roll convexity of 0.06mm and work roll and support roll body 1 ＝1450mm，L 2 Machining roughness R of 1# frame working roll of =1450mm a1 Roughness R on machine of 2# machine frame working roll with =1.73 mu m a2 1# machine frame working roll rolling kilometer number L of =0.58 mu m 1# Kilometer L in 2# working roll with 10km 2# Minimum value P of allowable rolling force of 1# rack in stiffness curve of rolling mill by =10km 1min Allowable minimum value P of rolling force of 2# rack of =4600KN 2min ＝2200KN；
B) Collecting the key rolling process parameters of the strip to be comprehensively set with the metal model parameters, which mainly comprises the following steps: transverse thickness distribution of incoming strip
Figure RE-GDA0003322481060000083
Elongation coefficient of 0.69, rolling speed V =120m/min, tension of the strip T 0 ＝87KN、T 1 ＝117KN、T 2 =65KN, strip width B =915mm.
C) Collecting process characteristic parameters, i.e. target roughness of strip
Figure RE-GDA0003322481060000081
D) Taking the number of rolled kilometers with the length of 0-10 km, taking 200 points on strip steel, and setting the original roughness R 'of the surface of the roller' a0 ＝1.4μm，R″ a0 ＝0.5μm；
E) Setting an initial value of N, and enabling N =1;
f) Calculating the surface roughness Ra of the roller when rolling the 1 st point strip steel 1 ，Ra 1 ＝Ra 0 ·e -0.0018 ；
G) From the thickness xi of the smoothing liquid oil film i And rolling process parameters, and calculating the thickness xi 'of the leveling liquid oil film at the 1 st point of the strip steel' 1 ，ξ″ 1 ；
H) Calculating the friction coefficient mu 'rolled on the two stands at the current position' 1 ＝0.55，μ″ 1 ＝0.47；
I) Calculating the rolling force P on the two stands of the rolling pressure under the current working condition 1 ＝6743KN，P 2 ＝2994KN；
J) The rolling force P of the two stands can be seen 1 ＞P 1min ，P 2 ＞P 2min If the minimum value of the rolling force which meets the requirement of stable rolling in the stiffness curve of the rolling mill is met, entering the step I);
k) Calculating the front tension transverse distribution sigma of the finished strip under the determined conditions of the incoming material 1 (x)；
L) calculating a unit outlet plate shape value I =5.2 under the current rolling pressure;
m) calculating the surface roughness R' of the finished product strip steel at the point with N =1 a1 ＝0.41；
N)N<N 0 If yes, entering step M);
o) order
Figure RE-GDA0003322481060000082
As an objective function, wherein I is the number of transverse strip elements of the strip steel, I i For the strip shape distribution value, alpha, of each strip in the transverse direction of the strip 1 、α 2 Beta, gamma are weighting coefficients, where alpha is taken 1 ＝0.25、α 2 ＝0.25、β＝0.3、γ＝0.1；
P) the minimum of the objective function F (X) is found by the Powell method. If the result meets Powell conditions, entering the step O) immediately, otherwise, returning to the step C) to search new data points;
q) carrying out cyclic calculation on a plurality of groups of data, and finally, outputting a set value R of the original roughness of the surface of the roller meeting the conditions in step P) a1 ＝1.66μm、R a2 ＝0.55μm。
It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications and substitutions based on the above-mentioned technical solutions are within the scope of the present invention as defined in the claims.

Claims (6)

1. The method for optimally setting the surface roughness of the high-temperature material roller of the double-frame temper mill is characterized by comprising the following steps of:
a) Collecting the characteristic parameters of the equipment of the double-frame leveling machine set,
b) Collecting the key rolling technological parameters of the strip to be comprehensively set with the metal model parameters,
c) Collecting process characteristic parameters, i.e. target roughness of strip
Figure RE-FDA0003322481050000011
D) Taking rolling kilometers of 0-L km length, and taking N on the strip steel 0 Point, setting the original roughness R of the roll surface a0 Original roughness of the primary frame and the secondary frame is R' a0 ，R″ a0 ；
E) Setting an initial value of N, and enabling N =1;
f) Calculating the surface roughness Ra of the roller when rolling the N point strip steel rN ，
Figure RE-FDA0003322481050000012
r represents the number of racks, L 0 For the current number of rolled kilometers, in which B l Collecting a large amount of field data for the roughness attenuation coefficient of the roller, obtaining the roughness attenuation coefficient of the current unit by a regression processing method, and taking B l ＝1.3×10 -4 ～1.5×10 -4 ；
G) Thickness xi of oil film from leveling liquid i And the parameters of the rolling process are related,
h) Calculating the friction coefficient of rolling on the two stands of the current position, mu' N ，μ″ N ，
Figure RE-FDA0003322481050000013
Wherein a is a liquid friction coefficient and b is a dry friction influence coefficient;
i) Calculating the rolling force P on two stands under the current working condition 1 ，P 2 (ii) a P = f · L; wherein f is unit rolling force, and L is the contact arc length of the roller and the strip in the rolling deformation zone;
j) Judging the rolling force P of the two frames 1 ，P 2 Whether the minimum value of the rolling force for satisfying stable rolling in the stiffness curve of the rolling mill, namely P, is satisfied 1 ＞P 1min And P is 2 ＞P 2min If the judgment condition is met, the step I) is immediately carried out, if the judgment condition is not met, the step D) is returned to a0 ；
K) Calculating the transverse distribution of the front tension of the finished strip under the condition of determining the incoming material;
l) calculating a unit outlet plate shape value I under the current rolling pressure,
Figure RE-FDA0003322481050000014
E. v is the Young's modulus and Poisson's ratio, σ, of the work roll 1i For transverse distribution of front tension, σ 1 Is a front tension value;
m) calculating the surface roughness R' of the finished product strip steel at the point with N =1 aN ；
N) judgment of N>N 0 Is there a If the condition is not satisfied, making N = N +1, returning to the step E), calculating the roughness and the plate shape value of the next point, and if the condition is satisfied, immediately entering the step M);
o) order
Figure RE-FDA0003322481050000021
As an objective function, wherein I is the number of transverse strip elements of the strip steel, I i For the strip shape distribution value, alpha, of each strip in the transverse direction of the strip 1 、α 2 Beta, gamma are weighting coefficients, where alpha is taken 1 ＝0.25、α 2 ＝0.25、β＝0.3、γ＝0.1；
P) solving the minimum value of the target function F (X) by using a Powell method, if the result meets Powell conditions, immediately entering a step O), and if not, returning to the step C) to search a new data point;
and Q) outputting the set value of the original roughness of the surface of the roller meeting the conditions, and finishing the optimization process.
2. The method for optimally setting the surface roughness of the high-temperature material roller of the double-stand temper mill as claimed in claim 1, wherein the step A) of collecting the equipment characteristic parameters of the double-stand temper mill mainly comprises the following steps of: diameter D of 1# frame work roll of steel grade w1 Diameter D of 2# frame working roll w2 Convexity of working roll, length L of working roll body and length L of supporting roll body 1 ，L 2 And the machining roughness R of the working roll of the 1# frame a1 And the machining roughness R of the working roll of the No. 2 frame a2 1# frame working roll rolling kilometer number L 1# L kilometer in rolled 2# working rolls 2# Minimum allowable rolling force P of 1# frame in rolling mill stiffness curve 1min Allowable maximum value P of rolling force of 2# frame 2min 。
3. The method for optimally setting the surface roughness of the high-temperature material roller of the double-stand temper mill according to claim 2, wherein the step B) of collecting the key rolling process parameters of the strip to be comprehensively set as the metal model parameters mainly comprises the following steps: thickness of incoming stripTransverse distribution value H i Elongation distribution coefficient, rolling speed V, strip tension T 0 、T 1 、T 2 And a strip width B.
4. The method as claimed in claim 3, wherein the step G) is performed based on a thickness ξ of the leveling liquid oil film i And rolling process parameters, and calculating the thickness xi 'of the flattening liquid oil film at the Nth point of the strip steel' N Wherein:
Figure RE-FDA0003322481050000022
in the formula: h is 0N 、h 1N Represents the thickness of the strip steel inlet of the No. 1#2 stander; k is a radical of c Expressing the influence coefficient of the concentration of the emulsion; theta represents the viscosity compressibility of the emulsion; eta 0 Represents the emulsion dynamic viscosity; v 0N 、V 1N Representing the strip steel inlet speed of a No. 1#2 stander; alpha is alpha N Indicating the bite angle; k is the deformation resistance of the inlet strip steel; k is a radical of formula rg The coefficient of the intensity of the lubricant carried in the longitudinal roughness of the surfaces of the working roll and the strip steel; k is a radical of rs The impression rate, i.e., the rate at which the surface roughness of the work roll is transferred to the strip, is expressed.
5. The method for optimally setting the surface roughness of the high-temperature material roller of the double-stand temper mill according to claim 3 or 4, wherein I) the rolling force P on the two stands under the rolling pressure under the current working condition is calculated 1 ，P 2 (ii) a P = f · L; wherein f is a unit rolling force,
Figure RE-FDA0003322481050000031
l is the contact arc length of the roller and the strip in the rolling deformation zone,
Figure RE-FDA0003322481050000032
b is the strip width, a 0 、a 1 For levelling the steel grade and the coefficient of influence of the working conditions, sigma p Is equivalent deformation resistance, σ p ＝k 3 ·(σ s +a·lg1000·e)-(k 1 ·T 1 +k 2 ·T 0 ) D is the diameter of the working roll, epsilon is the elongation of the strip, mu is the coefficient of friction, h 0 Is the strip entry thickness, e is the rate of deformation, k 1 、k 2 As a front-to-back tension weighting coefficient, k 3 As coefficient of influence of deformation resistance, σ s For the strip yield strength, a is the strain rate coefficient.
6. The double-stand temper mill high temperature material roller surface roughness optimized setting method according to claim 5, wherein K) calculating the front tension transverse distribution of the finished strip under the condition of determined incoming material; the front tension lateral profile can be expressed as:
Figure RE-FDA0003322481050000033
wherein σ 1 (x) For the unit tension, σ, of each point in the transverse direction of the strip 1 For the exit side total tension, B is the strip width,
Figure RE-FDA0003322481050000034
is the average thickness of the strip outlet, h (x) is the transverse distribution value of the thickness of the strip outlet,
Figure RE-FDA0003322481050000035
h (x) is the average thickness of the strip inlet, L is the average length value of the incoming strip shape, L (x) is the transverse length value of the incoming strip shape, and Delauu' is the transverse distribution function of the transverse displacement increment of the strip.
CN202110701675.9A 2021-06-23 2021-06-23 Optimization setting method for surface roughness of high-temperature material roller of double-stand temper mill Pending CN115502220A (en)

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