CN108687139B - Rolling stability checking method suitable for secondary cold rolling unit under small deformation condition - Google Patents

Rolling stability checking method suitable for secondary cold rolling unit under small deformation condition Download PDF

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CN108687139B
CN108687139B CN201810345233.3A CN201810345233A CN108687139B CN 108687139 B CN108687139 B CN 108687139B CN 201810345233 A CN201810345233 A CN 201810345233A CN 108687139 B CN108687139 B CN 108687139B
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rolling
cold rolling
reduction rate
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roll
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白振华
李鹏
崔熙颖
张立更
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Yanshan University
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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
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
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Abstract

The invention discloses a rolling stability checking method suitable for a secondary cold rolling unit under a small deformation condition, which is used for checking the small deformation stability rolling capability of the secondary cold rolling unit by taking the minimum stable rolling deformation as a target function and taking no slipping or Jumping phenomenon as a constraint condition aiming at a typical specification steel type needing small deformation rolling and combining stable rolling factor analysis research results and related optimization technologies on the basis of laboratory rolling mill tests and deformation process researches. And on the premise of ensuring that the slip factor and the rolling stress are in an allowable range, obtaining the minimum value of the reduction rate epsilon value through optimization.

Description

Rolling stability checking method suitable for secondary cold rolling unit under small deformation condition
Technical Field
The invention relates to the field of cold rolling, in particular to a rolling stability checking method of a secondary cold rolling unit under a small deformation condition.
Background
In the production process of cold continuous rolling, the rolling stability check of a cold rolling unit under different deformation conditions is more and more important. The research on the stability of the small deformation of the secondary cold rolling unit mainly comprises the research on the optimization technology of the roll technological parameters, the research on the optimization technology of the rolling technological parameters, the research on the influence of the integral rigidity curve of the rolling mill on the rolling stability and the research on the influence of the AGC control technology on the rolling stability, when the deformation of the secondary cold rolling unit is large, the rolling pressure and the forward slip value are large, a working roll with small roughness is needed to reduce the friction coefficient of a roll gap, when the deformation of the secondary cold rolling unit is small, the rolling pressure is small, the rolling is unstable, and a working roll with large roughness is needed to improve the friction coefficient of the roll gap, so the optimal values of the roll diameter and the roughness of the working roll of the rolling mill are respectively found based on the requirements of products with different deformations of the secondary cold rolling unit on the technological parameters of the roll, and when the deformation of the secondary cold rolling unit is large, the rolling pressure and the forward slip value are both large, the rolling technological parameters need to be adjusted towards the direction of reducing the rolling force and the forward slip value, and when the secondary cold rolling unit has small deformation, the rolling pressure is small, the rolling is unstable, and the rolling technological parameters need to be adjusted towards the direction of improving the rolling force, so that the front and rear tension and the rolling speed in the rolling process are respectively adjusted to optimal values based on the requirements of products with different deformation of the secondary cold rolling unit on the rolling technological parameters, and the optimization of the rolling technological parameters of the stable rolling of the secondary cold rolling unit is realized. The relation between the stable rolling capacity of the secondary cold rolling unit and the overall rigidity curve of the rolling mill is researched by adopting a method of combining field test tracking and experimental rolling mill experiments. The research on the influence of the AGC control technology on the rolling stability aims to ensure that the rolling stability of the secondary cold rolling mill unit under small deformation, namely the rolling pressure and the forward slip value are within an allowable range, and a whole set of process parameters of the secondary cold rolling mill unit are comprehensively optimized by particularly utilizing the optimization technology of the rolling process parameters, the rolling process parameters and the emulsion process parameters under small deformation on the basis of the original rolling, lubricating and rolling process system, so that the theory is linked with the actual production, and the effect is obvious.
Disclosure of Invention
The invention aims to provide a rolling stability checking method which takes the minimum stable rolling deformation as an objective function and takes no slipping and Jumping phenomena as constraint conditions and is suitable for a secondary cold rolling unit under the condition of small deformation.
In order to realize the purpose, the following technical scheme is adopted: the method comprises the following steps:
step a, collecting equipment and process parameters of a cold rolling unit;
step b, defining the reduction rate epsilon and the maximum reduction rate epsilonminInitiating epsilon0Setting the setting step length delta epsilon of the rolling reduction rate as 10 percent;
step c, initializing a parameter k of the middle process of the reduction rateε＝0；
Step d, calculating the reduction rate epsilon ═ epsilon0-kε·Δε；
Step e, calculating the friction coefficient mu under the current working condition, and obtaining a calculation model by the following formula:
in the formula: a is a liquid friction influence coefficient; b is a dry friction influence coefficient; b isξIs coefficient of friction damping index ξ02ξ, the amount of influence of roll roughness on lubricant film thickness, depending on the actual roll roughness01Dynamic oil film thickness for smooth roll rolling
Figure BDA0001631689720000031
In the formula: epsilon is the reduction rate; h is0Is the thickness of the strip steel at the inlet of the rolling mill; kmAverage deformation resistance; sigma0Is unit back tension, kcThe influence coefficient of the emulsion concentration is; theta is the viscosity compression coefficient of the emulsion; psi is the influence coefficient of the lubricating oil film speed,
Figure BDA0001631689720000032
wherein V is the rolling speed; elastic flattening radius of work roll
Figure BDA0001631689720000033
Step f, calculating the rolling stress p under the current working condition1A slip factor psi; rolling stress p1＝P/(B·l)；
Slip factor
Figure BDA0001631689720000034
Step g, inequality
Figure BDA0001631689720000035
kσJudging whether an inequality is established for the equivalent tension influence coefficient; if true, let kε＝kε+1, go to step d; otherwise, directly turning to the step h;
step h, outputting the minimum reduction rate epsilonminAnd (5) finishing the checking of the small-deformation stable rolling capability of the secondary cold rolling unit.
Further, in the step a, collecting equipment and process parameters of a cold rolling unit; the method comprises the following steps:
step a1, collecting roll technological parameters of a cold rolling mill group, comprising: radius R of work roll, original surface roughness Rar0Elastic modulus E of the working roll and Poisson ratio v of the working roll;
step a2, collecting relevant rolling process parameters of the cold rolling mill group, comprising the following steps: average deformation resistance K of stripmAnd yield strength σsWidth B of strip, thickness h of incoming material0Normal rolling speed V, rolling pressure set value P, unit pre-tension sigma1Unit back tension sigma0；
Step a3, collecting technological lubrication system parameters, comprising: emulsion concentration c, initial temperature t0Flow rate w, dynamic viscosity η of the emulsion, compression factor theta;
step a4, collecting technological characteristic parameters of the cold rolling mill group, comprising: permissible maximum rolling pressure P*Critical maximum forward slip value S*。
Compared with the prior art, the method has the following advantages:
1. the method realizes the check of the small-deformation stable rolling capability of the secondary cold rolling mill set, and can effectively and timely check the small-deformation stable rolling capability of the secondary cold rolling mill set.
2. In order to ensure that the rolling pressure and the forward slip value of the secondary cold rolling unit are within the allowable range under small deformation, the rolling instability caused by small deformation in the cold rolling process is avoided, and the rolling unevenness and the poor performance of the plate shape of the rolling mill are avoided. The stability checking is carried out, the problems of the rolling mill are adjusted and solved in time, the large loss is effectively avoided, and the benefit of a production enterprise is improved in a phase-changing manner.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
The invention is further illustrated with reference to figure 1:
example 1
As shown in fig. 1, the steps of the method of the present invention are as follows:
(a) collecting main equipment and technological parameters of a cold rolling unit, mainly comprising the following steps:
a1) collecting technological parameters of rollers of a cold rolling unit, mainly comprising the following steps: radius R of work roll is 107.5mm, and original surface roughness Rar00.75, the elastic modulus E of the working roll is 217 multiplied by 9.806, and the Poisson ratio v of the working roll is 0.3;
a2) collecting relevant rolling process parameters of a cold rolling unit, mainly comprising the following steps: average deformation resistance K of stripm475MPa and yield Strength σs240MPa, strip width B966 mm, incoming thickness h00.275mm, 453m/min for normal rolling speed v, 1000kN for rolling pressure set value P, and front tension σ1129MPa, post-tension σ0＝79MPa；
a3) Collecting technological lubricating system parameters, which mainly comprises the following steps: emulsion concentration c 2.3% initial temperature t058.7 ℃, the flow rate w is 22.0L/min, the dynamic viscosity η of the emulsion is 0.016Pa.s, and the compression coefficient theta is 0.01;
a4) collecting technological characteristic parameters of a cold rolling unit, mainly comprising the following steps: permissible maximum rolling pressure P*4899.574kN, critical maximum forward slip value S*＝0.1499mm；
(b) Defining a reduction rate ε and a minimum reduction rate εminInitiating epsilon0Setting step length delta epsilon of the given reduction rate to be 0.1 percent;
(c) initial reduction rate intermediate process parameter kε＝0；
(d) Calculating the reduction rate epsilon ═ epsilon0-kε·Δε＝10％；
(e) Calculating the friction coefficient under the current working condition;
(f) calculating the rolling stress p under the current working condition1P/(B · l) 240.586kN, slip factor
Figure BDA0001631689720000051
(g) Judgment inequality
Figure BDA0001631689720000052
(taking k empirically)σ1.6), let kε＝kεIf +1 is 1, proceeding to step (d); k toεAssigning until the inequality is not established, and then turning to the step (h);
(h) finally outputting the minimum depression rate epsilonminAnd (4.1) finishing the checking of the small-deformation stable rolling capacity of the secondary cold rolling unit.
Example 2
(a) Collecting main equipment and technological parameters of a cold rolling unit, mainly comprising the following steps:
a1) collecting technological parameters of rollers of a cold rolling unit, mainly comprising the following steps: radius R of the work roll is 90mm, and original surface roughness Rar00.75, the elastic modulus E of the working roll is 217 multiplied by 9.806, and the Poisson ratio v of the working roll is 0.3;
a2) collecting relevant rolling process parameters of a cold rolling unit, mainly comprising the following steps: average deformation resistance K of stripm475MPa and yield Strength σs240MPa strip width B1050 mm, incoming thickness h00.185mm, 360m/min normal rolling speed, 1260kN rolling pressure set point, front tension sigma1138MPa, post-tension σ0＝69MPa；
a3) Collecting technological lubricating system parameters, which mainly comprises the following steps: initial temperature t of emulsion concentration c 1.8%055 ℃, flow rate w is 22.0L/min, dynamic viscosity η of the emulsion is 0.016Pa.s, and compression coefficient theta is 0.01;
a4) collecting technological characteristic parameters of a cold rolling unit, mainly comprising the following steps: permissible maximum rolling pressure P*4899.574kN, critical maximum forward slip value S*＝0.1499mm；
(b) Defining a reduction rate ε and a minimum reduction rate εminInitiating epsilon0Setting step length delta epsilon of the given reduction rate to be 0.1 percent;
(c) initial reduction rate intermediate process parameter kε＝0；
(d) Calculating the reduction rate epsilon ═ epsilon0-kε·Δε＝10％；
(e) Calculating the friction coefficient under the current working condition;
(f) calculating the rolling stress p under the current working condition1P/(B · l) 235.35kN, slip factor
Figure BDA0001631689720000061
(g) Judgment inequality
Figure BDA0001631689720000062
(taking k empirically)σ1.6), let kε＝kεIf +1 is 1, proceeding to step (d); k toεAssigning until the inequality is not established, and then turning to the step (h);
(h) finally outputting the minimum depression rate epsilonmiAnd n is equal to 5.6 percent, and the checking of the small deformation stable rolling capability of the secondary cold rolling unit is completed.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.

Claims (1)

1. A rolling stability checking method suitable for a secondary cold rolling unit under a small deformation condition is characterized by comprising the following steps:
step a, collecting equipment and process parameters of a cold rolling unit, comprising the following steps:
step a1, collecting roll technological parameters of a cold rolling mill group, comprising: radius R of work roll, original surface roughness Rar0Elastic modulus E of the working roll and Poisson ratio v of the working roll;
step a2, collecting relevant rolling process parameters of the cold rolling mill group, comprising the following steps: average deformation resistance K of stripmAnd yield strength σsWidth B of strip, thickness h of incoming material0Outlet thickness h, normal rolling speed V, rolling pressure set value P, and unit pre-tension sigma1Unit back tension sigma0Total front tension T1Total back tension T0；
Step a3, collecting technological lubrication system parameters, comprising: emulsion concentration c, initial temperature t0Flow rate w, dynamic viscosity η of the emulsion, compression factor theta;
step a4, collecting technological characteristic parameters of the cold rolling mill group, comprising: allowable maximum rolling pressure P, critical maximum slip factor ψ;
step b, defining the reduction rate epsilon and the minimum reduction rate epsilonminInitial reduction rate ε0Setting the setting step length delta epsilon of the rolling reduction rate as 10 percent;
step c, initializing a parameter k of the middle process of the reduction rateε＝0；
Step d, calculating the reduction rate epsilon ═ epsilon0-kε·Δε；
Step e, calculating the friction coefficient mu under the current working condition, and obtaining a calculation model by the following formula:
Figure FDA0002289275190000011
in the formula: a is a liquid friction influence coefficient; b is a dry friction influence coefficient; b isξIs coefficient of friction damping index ξ02ξ, the amount of influence of roll roughness on lubricant film thickness, depending on the actual roll roughness01Dynamic oil film thickness for smooth roll rolling
Figure FDA0002289275190000021
In the formula: k is a radical ofcThe influence coefficient of the emulsion concentration is;
Figure FDA0002289275190000022
in order to influence the coefficient of influence of the lubricating oil film speed,
Figure FDA0002289275190000023
elastic flattening radius of work roll
Figure FDA0002289275190000024
Step f, calculating the rolling stress p under the current working condition1A slip factor psi; rolling stress p1P/(B · l), l is the rolling deformation zone length;
slip factor
Figure FDA0002289275190000025
Delta h is the reduction;
step g, inequality
Figure FDA0002289275190000026
kσJudging whether an inequality is established for the equivalent tension influence coefficient; if true, let kε＝kε+1, go to step d; otherwise, directly turning to the step h;
step h, outputting the minimum reduction rate epsilonminAnd (5) finishing the checking of the small-deformation stable rolling capability of the secondary cold rolling unit.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101927261A (en) * 2010-01-02 2010-12-29 燕山大学 Method for comprehensively optimizing process lubrication system of secondary cold rolling unit in rolling mode
CN102744268A (en) * 2012-07-03 2012-10-24 中冶南方（武汉）信息技术工程有限公司 Method for confirming depressurizing distribution of single-rack reversible cold-rolling mill
CN103406361A (en) * 2013-08-05 2013-11-27 苏州有色金属研究院有限公司 Aluminum cold-rolling mill rolling schedule generation method based on material states and parameter curves
CN106909723A (en) * 2017-02-16 2017-06-30 燕山大学 Cold-rolled process emulsifies flow quantity and mill speed relation curve Optimal Setting method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101927261A (en) * 2010-01-02 2010-12-29 燕山大学 Method for comprehensively optimizing process lubrication system of secondary cold rolling unit in rolling mode
CN102744268A (en) * 2012-07-03 2012-10-24 中冶南方（武汉）信息技术工程有限公司 Method for confirming depressurizing distribution of single-rack reversible cold-rolling mill
CN103406361A (en) * 2013-08-05 2013-11-27 苏州有色金属研究院有限公司 Aluminum cold-rolling mill rolling schedule generation method based on material states and parameter curves
CN106909723A (en) * 2017-02-16 2017-06-30 燕山大学 Cold-rolled process emulsifies flow quantity and mill speed relation curve Optimal Setting method

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