CN115971258B - Control method for strip shape and convexity of hot continuous strip mill - Google Patents
Control method for strip shape and convexity of hot continuous strip mill Download PDFInfo
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Abstract
The invention belongs to the field of steel rolling, and particularly relates to a control method for strip shape and plate convexity of a hot continuous strip steel rolling mill. The roll profile curve of the work rolls of the hot continuous rolling mill can be optimized to improve the control capability of the strip shape and the plate convexity of the narrow strip steel. The method comprises the following steps: in the process of hot rolling the narrow strip steel by the narrow strip steel hot continuous rolling machine, a ground state roll bending force model of a working roll of the narrow strip steel hot continuous rolling machine is established. And establishing a roll shape equation of the working roll according to the ground state roll bending force model and the specification of the corresponding narrow strip steel, and designing the roll shape of the working roll. The working rolls roll the rubber pad, at least obtain the working roll rotates in a circle, the rolling thickness of rubber pad rolling between two working rolls. And adjusting the rolling thickness of the rubber pad to enable the working roller to work with a first roller bending force, obtaining the deformation of the working roller under the first roller bending force, and optimizing the roller profile curve of the working roller according to the deformation.
Description
Technical Field
The invention belongs to the field of steel rolling, and particularly relates to a control method for strip shape and plate convexity of a hot continuous strip steel rolling mill.
Background
The sheet strip is a major steel product, especially a tandem rolled sheet strip as a steel product with high technical content, and its yield and specific gravity are important signs for measuring a national industrial level. The rolling process of the plate strip is a complex metal press working process, and the plate convexity and the plate shape affect the quality of the plate strip as the main geometric dimensional accuracy of the plate strip.
The existing hot continuous rolling process of the narrow strip steel lacks a control method for the shape and convexity of the strip steel, and a balancing device is generally arranged between working rolls of the hot continuous rolling mill, but a roll bending device is not arranged. For hot continuous rolling mills, the plate shape and plate convexity of the rolled piece are difficult to control, and only the plate shape control can be performed by adjusting the load distribution, and the load distribution method has very limited capability of adjusting the plate convexity.
Disclosure of Invention
In order to overcome the defects in the related art, the invention provides a control method for the shape and the plate convexity of a hot continuous rolling mill for narrow strip steel, which can optimize the roll profile curve of a working roll of the hot continuous rolling mill so as to improve the control capability of the shape and the plate convexity of the narrow strip steel.
In order to achieve the technical aim, the invention provides a control method for the strip shape and the plate convexity of a hot continuous strip mill. The control method for the strip shape and the plate convexity of the hot continuous strip mill comprises the following steps: and obtaining a roll shape curve of a working roll of the hot continuous strip mill. The working rolls roll the rubber pad, at least obtain the working roll rotates in a circle, the rolling thickness of rubber pad rolling between two working rolls. The rolling thickness of the rubber pad is adjusted, so that the working roll works with a first bending force, deformation of the working roll under the first bending force is obtained, a roll shape curve of the working roll is optimized according to the deformation, and when the working roll carries out hot rolling on the narrow strip steel under the first bending force, a first line on the working roll keeps or tends to be a straight line. Wherein, the first line is: and a vertical surface passing through the center line of the working roller and intersecting with the side wall of the working roller to form a plurality of lines close to the narrow strip steel.
Preferably, the method for obtaining the roll profile curve of the working roll of the hot strip mill comprises the following steps: in the process of hot rolling the narrow strip steel by the narrow strip steel hot continuous rolling machine, a ground state roll bending force model of a working roll of the narrow strip steel hot continuous rolling machine is established. And establishing a roll shape equation of the working roll according to the ground state roll bending force model and the specification of the corresponding narrow strip steel, and designing the roll shape of the working roll.
Preferably, the method for establishing the ground state roll bending force model of the working roll of the strip hot continuous rolling mill comprises the following steps: and acquiring a roll bending force adjusting range corresponding to the narrow strip steel rolled by the narrow strip steel hot continuous rolling mill, wherein the roll bending force adjusting range comprises the maximum roll bending force of a working roll, the minimum roll bending force of the working roll and the balance force of the working roll.
The formula of the ground state roller force model is as follows:
wherein F is the ground state roll bending force of the working roll in the process of rolling the narrow strip steel by the narrow strip steel hot continuous rolling mill;
the maximum roll bending force of the working roll in the process of rolling the narrow strip steel by the narrow strip steel hot continuous rolling mill; />
The minimum roll bending force of the working roll is the minimum roll bending force of the narrow strip hot continuous rolling mill in the narrow strip rolling process; />
And (3) balancing force for working rolls on the hot continuous strip mill.
Preferably, when the roll shape of the working roll is designed, the roll shape curve of the working roll satisfies a roll shape equation formula:
in the method, in the process of the invention,
the proportional convexity of the narrow strip steel is corresponding to the ground state roller bending force; />
Setting a proportional convexity for the narrow strip steel; m is the specification number of the narrow strip steel produced by the narrow strip steel hot continuous rolling mill.
Preferably, the correspondence between the rolling thickness of the rubber pad and the bending force satisfies the formula:
in the method, in the process of the invention,
a roll bending force when the rubber pad is rolled for the working roll; />
The elastic modulus of the rubber pad;
the distance between the bearing seats of the two working rolls is equal to the distance between the bearing seats of the two working rolls; />
The rolling thickness of the rubber pad is the rolling thickness of the rubber pad.
Preferably, the method for optimizing the roll profile of the work roll according to the deformation comprises the following steps: and obtaining the deformation of the working roll under the first bending force according to the rolling thickness of the working roll to the rubber pad under the first bending force. And adjusting the diameter of the working roller in the radial direction according to the deformation, so that the first line keeps or tends to be straight.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, by utilizing the elastic characteristic of the rubber material and adjusting the rolling thickness of the rubber pad between the working rolls, the corresponding first bending force of the working rolls when rolling a narrow strip steel with a certain specification can be obtained, and meanwhile, the deformation of the working rolls under the action of the first bending force can be known, so that the roll profile curve can be optimized, the shape and the plate convexity of the rolled narrow strip steel are easy to control, and the product quality of the narrow strip steel is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the related art, the drawings that are required to be used in the embodiments or the related technical descriptions will be briefly described, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.
FIG. 1 is a step diagram of a control method for strip shape and plate convexity of a hot tandem strip mill according to the present invention;
FIG. 2 is a block diagram of a work roll product according to the present invention;
FIG. 3 is a numerical cross-sectional view through the center axis of the work roll provided by the present invention as it rolls a product;
FIG. 4 is a block diagram of an upper work roll according to the present invention;
FIG. 5 is a block diagram of another upper work roll provided by the present invention;
FIG. 6 is a block diagram of two upper work rolls according to the present invention after deformation;
FIG. 7 is a cross-sectional view of A-A in FIG. 4, a cross-sectional view of B-B in FIG. 5, and a cross-sectional view of C-C in FIG. 6 in accordance with the present invention;
fig. 8 is a cross-sectional view of D-D in fig. 4, a cross-sectional view of E-E in fig. 5, and a cross-sectional view of F-F in fig. 6 in the present invention.
Description of the embodiments
In order to make the above objects, features and advantages of the present invention more comprehensible, the following description of the embodiments accompanied with the accompanying drawings will be given in detail. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
Specific embodiments are described below.
Some embodiments of the present invention provide a control method for strip shape and plate convexity of a hot strip mill. As shown in fig. 1, the specific steps of the control method for the strip shape and the plate convexity of the hot strip mill comprise:
s1, acquiring a roll shape curve of a working roll of the hot continuous strip mill.
S2, rolling the rubber pad by the working rolls, and at least obtaining the rolling thickness of the rubber pad between the two working rolls within one circle of rotation of the working rolls.
S3, adjusting the rolling thickness of the rubber pad, enabling the working roll to work with the first roll bending force, obtaining deformation of the working roll under the first roll bending force, and optimizing a roll shape curve of the working roll according to the deformation.
When the working roll is made to hot-roll the narrow strip steel under the first bending force, the first line on the working roll keeps or tends to be straight. As shown in fig. 3, the first wire 31 is: and a vertical surface passing through the center line of the working roller and intersecting with the side wall of the working roller to form a plurality of lines close to the narrow strip steel.
Illustratively, it is first necessary to obtain the basic profile of the work roll, i.e., the roll profile of the work roll, in order to optimize and adjust the work roll according to the basic profile.
As shown in fig. 2, a hot tandem mill generally includes two work rolls: the upper working roll 1 and the lower working roll 2 are deformed under the reaction force of the narrow strip steel during the rolling process of the hot continuous rolling mill, for example, one possible deformation is that the middle part of the upper working roll 1 is raised upwards and the middle part of the lower working roll 2 is raised downwards.
In order to enable the two working rolls to deform under the action of bending force, the shape and the convexity of the narrow strip steel are in the precision range when the narrow strip steel is hot rolled, so that the roll profile curve of the working rolls is further optimized.
In order to facilitate the adjustment of the working rolls in the optimization process, the rolling process of the narrow strip steel is simulated by adopting the working rolls to roll the rubber pads. The bending force of the working roll when the narrow strip steel with corresponding specification is manufactured by simulated working roll is the first bending force, in this state, the deformation of the working roll is conveniently obtained, after the deformation of the working roll under the first bending force is obtained, a designer can optimize the roll profile curve of the working roll based on the roll profile equation of the working roll, so that the control of the strip steel plate shape and the plate convexity is realized, and the rolling quality of the narrow strip steel is improved.
In some embodiments, a method of obtaining a roll profile of a work roll of a hot strip mill includes:
s11, in the process of hot rolling the narrow strip steel by the narrow strip steel hot continuous rolling mill, establishing a ground state roll bending force model of a working roll of the narrow strip steel hot continuous rolling mill.
S12, establishing a roll shape equation of the working roll according to the ground state roll bending force model and the corresponding specification of the narrow strip steel, and designing the roll shape of the working roll.
In some embodiments, a method of modeling a ground state roll bending force of a work roll of a strip hot continuous rolling mill includes:
the method comprises the steps of obtaining a roll bending force adjusting range corresponding to the rolling of the narrow strip steel by a narrow strip steel hot continuous rolling mill, wherein the roll bending force adjusting range comprises the maximum roll bending force of a working roll, the minimum roll bending force of the working roll and the balance force of the working roll;
the formula of the ground state roll bending force model is as follows:
wherein F is a narrow strip steelIn the process of rolling the narrow strip steel by the hot continuous rolling mill, the ground state bending force of the working roll,
the maximum bending force of the working roll in the process of rolling the narrow strip steel by the narrow strip steel hot continuous rolling mill; />
The minimum bending force of the working roll is the minimum bending force of the working roll in the process of rolling the narrow strip steel by the hot continuous strip mill; />
Is the balance force of a working roll on the hot continuous rolling mill of the narrow strip steel.
The maximum roll bending force of the working roll is the maximum roll bending force during rolling of the hot continuous rolling mill for narrow strip steel with various specifications. The minimum roll bending force of the work rolls means the minimum roll bending force at the time of rolling by the hot continuous rolling mill for narrow strip steel of various specifications. The ground state roll bending force of the work roll means: for narrow strip steel with various specifications, one numerical value of a bending force range during rolling of the hot continuous rolling mill; the roll shape curve is designed according to the ground state roll bending force, so that the deformation of the working roll under different roll bending forces is in an allowable precision range, and the quality of the narrow strip steel is in a controllable range when the hot continuous rolling mill rolls the narrow strip steel with various specifications.
In some examples, one type of hot continuous rolling mill may roll a plurality of specifications of strip steel, and the rolling force required for the strip steel of different specifications is different during the rolling process, that is, the bending force of the work rolls is changed according to the specifications of the rolled strip steel. In order to adapt to the hot continuous rolling mill to roll narrow strip steel with various specifications, a ground state roll bending force model of a rolled product is established.
According to experience, the ground state roll bending force model is established, and the roll shape curve of the working roll designed by the ground state roll bending force can be suitable for rolling the narrow strip steel with various specifications.
Illustratively, according to the hot continuous rolling mill, a narrow strip of one specification, for example, a narrow strip made of carbon structural steel, may have a thickness of 1.8mm to 7.0mm. In order to roll the narrow strip steel by the hot continuous rolling mill, the working rolls are required to apply rolling pressure to the strip steel to be rolled, so that the strip steel to be rolled deforms under the action of the pressure to complete the rolling process. The reaction force of the rolling pressure of the working roll is a roll bending force, the steel strip to be rolled with the same specification is rolled, the thickness of the narrow strip steel rolled by the hot continuous rolling mill is 1.8mm, and the roll bending force of the working roll is the maximum roll bending force; the thickness of the narrow strip steel rolled by the hot continuous rolling mill is 7.0mm, and the bending force of the working roll is the minimum bending force. When the working roll is designed, the ground state roll bending force is obtained according to the maximum roll bending force and the minimum roll bending force, and the roll profile curve is designed through the ground state roll bending force so as to meet the requirement of the rolling narrow strip steel in accordance with the quality control after the working roll deforms under different roll bending forces.
In some embodiments, the roll shape equation of the work roll may be established according to the ground state roll force model and the specifications of the corresponding strip steel, wherein the roll shape equation of the work roll refers to the equation of the roll shape curve of the work roll, for example, the work roll may be a CVC roll shape, and the equation of the roll shape curve corresponding to the CVC roll shape may be selected according to the ground state roll force model and the specifications of the corresponding strip steel, thus establishing the basic shape of the work roll.
In some embodiments, when the roll profile of the work roll is designed using the equation for the roll profile, the roll profile of the work roll simultaneously satisfies the roll profile equation:
in the method, in the process of the invention,
the proportion convexity of the narrow strip steel is corresponding to the ground state roller bending force; />
The convexity of the narrow strip steel is set in proportion, namely the convexity required by the narrow strip steel; m is the specification number of the narrow strip steel produced by the narrow strip steel hot continuous rolling mill.
In some examples, the proportional convexity of a strip steel of one gauge under the ground state roll force may be obtained from in-situ process data or experiments.
In order to ensure the requirements of the plate shape and the plate convexity of the narrow strip steel, the roller shape equation is required to be satisfied while the roller shape curve type of the working roller is provided, and the design of the appearance of the working roller is realized, namely, the roller shape curve of the working roller is obtained.
The roll profile curve type of the working roll can be parabolic curve, hyperbolic curve or circular arc line, and different hot continuous rolling mills with different roll profile curve calculation modes belong to conventional technologies known to those skilled in the art, and are not described herein.
In order to ensure the requirements of the plate shape and the plate convexity of the narrow strip steel, the roller profile curve obtained by the prior art can also optimize the roller profile curve according to the proportional convexity of the narrow strip steel rolled under the ground state roller bending force and the set proportional convexity of the narrow strip steel with the specification. So that the convexity of the rolled narrow strip steel is within the precision requirement range after the working roll is deformed under the action of the bending roll force.
In some embodiments, the correspondence between the rolled thickness of the rubber pad and the roll bending force satisfies the formula:
in the method, in the process of the invention,
the bending force is generated when the rubber pad is rolled by the working roll; />
The elastic modulus of the rubber pad; />
The distance between the bearing seats of the two working rolls is set; />
Is the rolling thickness of the rubber pad.
For example, the rubber pad may be a long strip structure with a rectangular cross section, and the cross section may be a rectangular structure with a length of 60cm to 150cm, for example, a length of 60cm, 100cm or 150cm, and a width of 1cm to 5cm, for example, a width of 1cm, 3cm or 5cm. The rubber pad may have a length of 50cm to 100cm, for example, 50cm, 70cm or 100cm.
When the rubber pad rolls between two working rolls, the roll bending force of the working rolls can be controlled by adjusting the rolling thickness of the rubber pad, so that the working rolls have the same roll bending force as a narrow strip steel with certain specification, wherein the rolling thickness of the rubber pad is the gap width between the two working rolls, and the deformation amplitude of the two working rolls can be reflected.
According to constitutive relation of rubber materials, deformation of the rubber pad along the axial direction of the working roller is ignored, and a model formula of deformation amount and roller bending force of the rubber pad can be established:
in the method, in the process of the invention,
is the deformation of the rubber pad.
Through the conversion of the equation, the rolling thickness of the rubber pad can be known to meet the following formula:
in some embodiments, as shown in fig. 3, 5 and 6, in which fig. 3 is a structural diagram of deformation of the work rolls when rolling a narrow strip steel, fig. 5 is a structural diagram of the upper work rolls after optimization of the roll profile, the solid line portion in fig. 6 is a state diagram of deformation of the roll profile before optimization of the upper work rolls, and the dotted line portion is a state diagram of deformation of the roll profile after optimization of the upper work rolls.
Wherein, according to the deformation amplitude of the working roller, the roller shape curve of the working roller is optimized, so that the first wire 31 tends to be a horizontally arranged straight line; the first line 31 includes two lines, and the two lines are close to the rubber pad.
Illustratively, when the working roll rolls a rubber pad or a strip, the reaction force of the rubber pad or the strip to the working roll deforms the working roll. Taking the work roll as a cylindrical rod as an example, as shown in fig. 4, a structure diagram of the upper work roll 1 when no load is applied is shown. The upper work roll 1 and the lower work roll are both maintained in a horizontal state. When the work rolls are loaded, as shown in fig. 2, the work rolls form a positive bend, which is that the middle part of the upper work roll 1 is raised upwards and the middle part of the lower work roll 2 is raised downwards.
In order to compensate the narrow strip steel in the rolling process, after the working rolls deform, the thickness between the two working rolls is in a controllable range, for example, the thickness between the two working rolls is uniform and stable, the shape and the convexity of the rolled narrow strip steel meet the product requirements, and the roll profile curve of the working rolls needs to be compensated.
The work rolls deform under the first bending force, and according to the deformation amplitude, the diameter of the position where the upper work roll 1 deforms and/or the diameter of the position where the lower work roll deforms can be increased. It will be appreciated that the difference between the diameter of the vertical cross section at any one of the deformation positions of the upper or lower work rolls 1, and the diameter at the position corresponding to the work roll that is not compensated should be smaller than the deformation amplitude at the deformation position corresponding to the upper or lower work roll. And the larger the deformation amplitude is, the larger the difference between the diameter of the vertical section at the deformation position corresponding to the upper working roller or the lower working roller and the diameter of the working roller which is not compensated is. So that the first wire, after being deformed by the bending force of the work rolls, tends to be a horizontally arranged straight line, that is, the gap between the two work rolls remains relatively straight during rolling of the strip.
Illustratively, optimizing the roll profile of the work roll, even after the work roll is deformed by the bending force, the first strand remains or tends to be horizontal, requiring that the first strand be a particular strand. That is, the roll profile of the work roll is compensated under the first bending force, specifically, the work roll is deformed at the first bending force, and at this time, the roll profile of the work roll is compensated according to the profile of the first wire, so that the first wire tends to be horizontally disposed. As shown in fig. 7 and 8, wherein C-C in fig. 7 is a cross-sectional view of the optimized upper work roll (dashed line portion) in fig. 6 at the position of the section line CC, and F-F in fig. 8 is a cross-sectional view of the optimized upper work roll (dashed line portion) in fig. 6 at the position of the section line FF.
A-a in fig. 7 shows a sectional view of a work roll which is not compensated and is not subjected to a bending force, B-B shows a sectional view of a work roll which is compensated and is not subjected to a bending force, and C-C shows a sectional view of a work roll which is compensated and is subjected to a first bending force. Wherein the A-A, B-B and C-C sectional views in fig. 7 are identical at the axial positions of the work rolls, the lower ends of the C-C sectional views are substantially at the same horizontal line as the lower ends of the A-A sectional views.
D-D in FIG. 8 shows a cross-sectional view of a work roll that is uncompensated and that is not subject to a roll bending force, E-E shows a cross-sectional view of a work roll that is compensated and that is not subject to a roll bending force, and F-F shows a cross-sectional view of a work roll that is compensated and that is subject to a first roll bending force. Wherein the D-D section, E-E section and F-F section in fig. 8 are identical at the axial position of the work roll, the lower end of the F-F section is substantially at the same horizontal line as the lower end of the D-D section. That is, the first line remains or tends to be horizontal under the first bending force of the compensated work roll, and the first line may be a curve when the compensated work roll does not receive the bending force.
It can be understood that the profile of the first line after the work roll is deformed under the action of the corresponding bending force can be controlled by adjusting the roll profile curve of the work roll, so that the plate profile or the plate convexity of the narrow strip steel can be controlled as required.
In the description of the present specification, a particular feature, structure, material, or characteristic may be combined in any suitable manner in one or more embodiments or examples.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (4)
1. A control method for strip shape and plate convexity of a hot strip mill, comprising:
acquiring a roll shape curve of a working roll of the hot continuous strip mill;
the working rolls roll the rubber pads, and the rolling thickness of the rubber pads between the two working rolls is at least obtained within one circle of rotation of the working rolls;
the rolling thickness of the rubber pad is adjusted, so that the working roll works with a first bending force, the deformation of the working roll under the first bending force is obtained, the roll shape curve of the working roll is optimized according to the deformation, and when the working roll carries out hot rolling on the narrow strip steel under the first bending force, a first line on the working roll keeps or tends to be a straight line;
wherein, the first line is: a vertical surface passing through the center line of the working roller and intersecting with the side wall of the working roller to form a plurality of lines close to the narrow strip steel;
the corresponding relation between the rolling thickness and the bending force of the rubber pad meets the formula:
in the method, in the process of the invention,
a roll bending force when the rubber pad is rolled for the working roll; />
The elastic modulus of the rubber pad; />
Two are twoBearing seat spacing of each working roller; />
The rolling thickness of the rubber pad is the rolling thickness of the rubber pad;
the method for optimizing the roll profile curve of the working roll according to the deformation comprises the following steps:
according to the rolling thickness of the working roll to the rubber pad under the first roll bending force, obtaining the deformation of the working roll under the first roll bending force;
and adjusting the diameter of the working roller in the radial direction according to the deformation, so that the first line is kept or tends to be straight.
2. The control method for strip shape and plate convexity of a hot strip mill according to claim 1, characterized in that said method for obtaining a roll profile of a work roll of a hot strip mill comprises:
in the process of hot rolling the narrow strip steel by the narrow strip steel hot continuous rolling machine, establishing a ground state roll bending force model of a working roll of the narrow strip steel hot continuous rolling machine;
and establishing a roll shape equation of the working roll according to the ground state roll bending force model and the specification of the corresponding narrow strip steel, and designing the roll shape of the working roll.
3. The control method for strip shape and plate convexity of a hot strip mill according to claim 2, characterized in that said method of establishing a ground state roll force model of the work rolls of said hot strip mill comprises:
acquiring a roll bending force adjusting range corresponding to the narrow strip steel rolled by the narrow strip steel hot continuous rolling mill, wherein the roll bending force adjusting range comprises the maximum roll bending force of a working roll, the minimum roll bending force of the working roll and the balance force of the working roll;
the formula of the ground state roller force model is as follows:
wherein F is the ground state roll bending force of the working roll in the process of rolling the narrow strip steel by the narrow strip steel hot continuous rolling mill;
the maximum roll bending force of the working roll in the process of rolling the narrow strip steel by the narrow strip steel hot continuous rolling mill; />
The minimum roll bending force of the working roll is the minimum roll bending force of the narrow strip hot continuous rolling mill in the narrow strip rolling process; />
And (3) balancing force for working rolls on the hot continuous strip mill.
4. The control method for strip shape and plate convexity of hot strip mill according to claim 2, wherein the roll shape curve of the work roll satisfies a roll shape equation formula when the roll shape of the work roll is designed:
in the method, in the process of the invention,
the proportional convexity of the narrow strip steel is corresponding to the ground state roller bending force; />
Setting a proportional convexity for the narrow strip steel; m is the specification number of the narrow strip steel produced by the narrow strip steel hot continuous rolling mill. />
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