CN113857295A - Method for setting bending force of straightening machine - Google Patents
Method for setting bending force of straightening machine Download PDFInfo
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Abstract
The invention relates to a method for setting the roll bending force of a straightening machine, belonging to the field of plate straightening, comprising S1, for a certain straightening machine, cleaning the geometric relationship among a hydraulic cylinder, a supporting roll and a straightening roll according to an equipment structure diagram; s2, establishing a relation among straightening force, roller bending force and straightening roller deflection; s3, enabling the negative bending force to be zero, selecting a characteristic point 1, enabling the deflection of the characteristic point 1 to be zero, solving the positive bending force at the moment, and drawing a roller-shaped curve; s4, selecting a characteristic point 2, and simultaneously enabling the deflection of the characteristic point 1 and the deflection of the characteristic point 2 to be zero, and solving the positive bending force and the negative bending force at the moment, namely the positive bending force and the negative bending force required by a single straightening roll; s5, distributing the positive bending force and the negative bending force to a positive bending hydraulic cylinder and a negative bending hydraulic cylinder; and S6, correcting the calculated positive bending force and negative bending force. The invention solves the problem that the roll bending force setting of the current straightening machine is immature.
Description
Technical Field
The invention belongs to the field of plate straightening, and relates to a method for setting a bending force of a straightening machine.
Background
The roll bending mechanism is generally applied to an advanced medium plate roll straightening machine and is one of important means for controlling the strip shape, but at present, no mature method exists for setting the roll bending force. The invention provides a method, which comprises the steps of firstly establishing the relation between the bending force of a hydraulic cylinder and the bending force provided by each supporting roller, and then setting the bending force by taking the deflection of a straightening roller characteristic point as a target function.
Disclosure of Invention
In view of the above, the invention aims to provide a method for setting the bending force of a straightener, which solves the problem that the current setting of the bending force of the straightener is immature.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for setting bending force of a straightener comprises the following steps:
s1, for a certain straightening machine, cleaning the geometric relation among a hydraulic cylinder, a supporting roller and a straightening roller according to an equipment structure diagram;
s2, establishing a relation among straightening force, roller bending force and straightening roller deflection;
s3, enabling the negative bending force to be zero, selecting a characteristic point 1, enabling the deflection of the characteristic point 1 to be zero, solving the positive bending force at the moment, and drawing a roller-shaped curve;
s4, selecting a characteristic point 2, and simultaneously enabling the deflection of the characteristic point 1 and the deflection of the characteristic point 2 to be zero, and solving the positive bending force and the negative bending force at the moment, namely the positive bending force and the negative bending force required by a single straightening roll;
s5, distributing the positive bending force and the negative bending force to a positive bending hydraulic cylinder and a negative bending hydraulic cylinder;
and S6, correcting the calculated positive bending force and negative bending force.
Further, in step S1, the straightener has a plurality of straightening rollers, hydraulic cylinders and supporting rollers, the supporting rollers are grouped and arranged in the bending roller box, the supporting rollers are in direct contact with the straightening rollers and provide bending force, the positive bending hydraulic cylinder acts on a part of the bending roller box and then acts on the supporting rollers in the box to provide positive bending force, similarly, the negative bending hydraulic cylinder acts on a part of the bending roller box and then acts on the supporting rollers in the box to provide negative bending force, and then the positive bending force or the negative bending force provided by a single supporting roller is:
in the formula, FzPositive bending force or negative bending force is provided for a single supporting roller; fyFor a straightening rollThe applied positive or negative bending force; n is the number of the supporting rollers which provide positive bending force or negative bending force on a certain straightening roller;
the positive bending force or the negative bending force transmitted to the straightening roll by the single supporting roll is as follows:
F＝Fzcosθ (2)
in the formula, F is a positive bending force or a negative bending force transmitted to the straightening roll by a single supporting roll, theta is an included angle between the supporting roll and the straightening roll, and when the supporting roll is positioned right above the straightening roll, theta is 0 degree;
the total positive bending force or the total negative bending force required by the straightening machine is as follows:
Fsum＝Fy1+Fy2+……+Fyn (3)
in the formula, FsumThe total positive bending force or the total negative bending force required by the straightening machine; fy1To FynThe positive bending force or the negative bending force required for the 1 st to nth straightening rolls is solved according to steps S2 to S4.
Further, in step S2, the relationship between the straightening force, the roll bending force, and the deflection is:
f(x)＝fj(x)+fw(x) (4)
wherein f (x) is the deflection of a certain point x on the straightening roll body; f. ofj(x) The deflection at a certain point x on the roller body of the straightening roller under the action of straightening force; f. ofw(x) The deflection at a certain point x on the straightening roll body under the action of the roll bending force.
Further, in step S3, if the strip steel is located in the middle of the straightening roll, the maximum deflection generated by the straightening force is located at the midpoint of the straightening roll body, and when the negative bending force is zero, the maximum deflection generated by the positive bending force is also located at the midpoint of the straightening roll body, the midpoint of the straightening roll body is selected as a characteristic point 1, and the deflection of the characteristic point 1 is set to be zero; assuming that the distance between two supporting points of the straightening roller is l, the coordinate of the characteristic point 1 is l/2, and then:
the required positive bending force is solved and a roll-type curve is drawn.
Further, if the solved positive bending force exceeds the bearing limit of the straightening machine, setting a step length delta, and gradually increasing the negative bending force until the positive bending force is solved again.
Further, in step S4, it is assumed that the positions of feature point 1 and feature point 2 are x, respectively1And x2Order:
f(x1)＝fj(x1)+fw(x1)＝0 (6)
f(x2)＝fj(x2)+fw(x2)＝0 (7)
in the formula, x1＝l/2；x2The horizontal coordinate of the maximum deflection position on the roller-shaped curve; the combined vertical type (6) and the formula (7) solve the positive bending force and the negative bending force.
Further, when the roll profile is "W", the roll bending force is set by the single characteristic point method, and step S4 is not performed.
Further, the distribution method of step S5 includes an average distribution method and a scale factor distribution method;
the average partition method is calculated as follows:
in the formula, FpcForce output for each positive or negative bending hydraulic cylinder; fbpPositive bending force or negative bending force required by a single straightening roll is calculated; n is a radical ofpThe number of the positive bending hydraulic cylinders or the negative bending hydraulic cylinders is;
the scaling factor method is calculated as follows:
if m upper straightening rolls are provided, i positive bending hydraulic cylinders are arranged at the inlet side of the strip steel and mainly act on the front n1An upper straightening roll, j positive bending hydraulic cylinders arranged on the outlet side of the strip steel and mainly acting on the nth2The distribution of the positive bending force to the last upper straightening roll is calculated as:
in the formula, alphapIs a proportionality coefficient; fbp1To Fbpn1Respectively 1# to n calculated1# positive bending force of the upper straightening roll; fbpn2To FbpmRespectively, is calculated n2Positive bending force of the upper straightening roll # to m #; fpc2The force is output by a single positive bending hydraulic cylinder at the inlet side of the strip steel; fbpCalculating the total positive bending force; and i is the number of positive bending hydraulic cylinders on the inlet side of the strip steel.
The proportional coefficient method of negative bending force is the same as the proportional coefficient method of positive bending force described above.
Further, in step S6, the correction needs to be performed by targeting the flatness of the strip shape, determining a correction coefficient according to the actual on-site debugging result, and assuming that the positive bending correction coefficient is βpNegative bending correction coefficient of betanThe actually required positive and negative bending forces are then:
Fpsa＝Fpsc·βp (11)
Fnsa＝Fnsc·βn (12)
in the formula, FpsaActual total positive bending force; fpscCalculating the total positive bending force; fnsaFor actual total negative bending force, FnscIs the calculated total negative bending force.
The invention has the beneficial effects that:
the method firstly establishes the relation between the bending force of the hydraulic cylinder and the bending force provided by each supporting roller, and then sets the bending force by taking the deflection of the characteristic point of the straightening roller as a target function. On the premise that the straightening force is known, the required roll bending force can be obtained.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a geometric relationship among a back-up roll, a strip steel, and a straightening roll;
in the figure: d is the distance between the left fulcrum and the roll body, and L is the length of the straightening roll body; l is the distance between the two fulcrums; w is the width of the strip steel; a is1The distance between the first supporting roller and the left fulcrum is shown; b1The length of the roller body of the supporting roller; c. C1The distance between the first supporting roller and the right fulcrum is shown;
FIG. 2 is a schematic view showing the structure of a leveler;
in the figure: the inlet side is the side where the strip steel enters, the outlet side is the side where the strip steel exits, 7 upper straightening rolls are provided, each upper straightening roll is provided with 3 bending roll boxes, 4 supporting rolls are arranged in one bending roll box, the hydraulic cylinders are positioned on the bending roll boxes, the middle of each upper straightening roll is provided with 4 positive bending hydraulic cylinders, and two negative bending hydraulic cylinders are arranged on two sides of each upper straightening roll;
FIG. 3 is a roll profile curve of the calculation result 1 when the strip has a width of 1700mm and the straightening force is 20 t;
FIG. 4 is a roll profile curve of the calculation result 2 when the strip steel has a width of 1700mm and the straightening force is 20 t;
FIG. 5 is a comparison curve between the calculation result 1 and the calculation result 2 when the strip steel has a width of 1700mm and the straightening force of 20 t;
FIG. 6 is a roll profile curve of the calculation result of the single characteristic point method when the strip steel has a width of 800mm and a straightening force of 20 t;
FIG. 7 is a comparison graph of the calculation result 1 and the calculation result 2 when the width of the strip is 1700mm and the straightening force is 500 t.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
The first embodiment is as follows:
there are 15-roll straightening machines in which 7 upper rolls and 8 lower rolls, each upper roll being equipped with 12 support rolls, are located in 3 bending roll boxes. The schematic of the apparatus is shown in figures 1 and 2. The following assumptions are now made:
(1) the acting force of the hydraulic cylinder can be completely transmitted to the supporting roll and is used as the bending force of the supporting roll to the straightening roll (the bending force is divided into positive bending force and negative bending force according to different acting points of the force);
(2) the middle positive bending force only acts on the middle 6 support rollers on one straightening roller, and the acting force is evenly distributed, similarly, the left negative bending force only acts on the left 3 support rollers on one straightening roller, and the acting force is evenly distributed, and the right negative bending force only acts on the right 3 support rollers on one straightening roller, and the acting force is evenly distributed;
(3) the supporting roller is positioned right above the straightening roller.
(4) The applied force is applied symmetrically, i.e. the negative bending force on the left side and the negative bending force on the right side are equal.
According to such an assumption, the method for setting the bending force of the leveler comprises the steps of:
s1, as shown in a figure 1 and a figure 2, clearing the geometric relation among a hydraulic cylinder, a supporting roller and a straightening roller; i.e. the straightener has 7 upper rolls and 8 lower rolls, each upper roll being provided with 12 support rolls in 3 bending boxes. The hydraulic cylinder is arranged on the bending roller box, the middle of the hydraulic cylinder is provided with 4 positive bending hydraulic cylinders, and two negative bending hydraulic cylinders are arranged on two sides of the hydraulic cylinder respectively.
The positive and negative bending forces required for each set of straightening forces can be calculated and then summed to give the total positive and negative bending forces. The total positive bending force is distributed by the middle 4 positive bending hydraulic cylinders, and the total negative bending force is distributed by the negative bending hydraulic cylinders on the two sides.
The middle 4 positive bending hydraulic cylinders can provide a maximum positive bending force of 400 tons, and the 2 negative bending hydraulic cylinders on each side can provide a maximum negative bending force of 200 tons on one side. The elasticity modulus of the straightening roll is 208000MPa, the length L of the roll body is 2000mm, the diameter of the straightening roll is 120mm, the distance d between the left fulcrum and the roll body (and the distance between the right fulcrum and the roll body) is 55mm, and the geometric parameters (unit: mm) of the supporting roll are as follows:
TABLE 1 geometrical parameters of the support rolls
The negative bending force of the left and right negative bending hydraulic cylinders is as follows:
in the formula, FylNegative bending force is provided for the left hydraulic cylinder to a certain straightening roll; fyrNegative bending force is provided for the hydraulic cylinder on the right side to a certain straightening roll; fyfThe total negative bending force on a straightening roll.
The negative bending force provided by a single support roller is:
in the formula, Fz1Negative bending forces are provided for a single support roller of the left 3 and right 3 support rollers.
The positive bending force provided by a single support roller is:
in the formula, FyzThe total positive bending force on a certain straightening roll; fz2Positive bending force is provided for a single support roller in the middle 6 support rollers.
The negative bending force transmitted by the single support roll to the straightening roll is as follows:
F1＝Fz1cosθ (2.1)
since the supporting roller is positioned right above the straightening roller, theta is 0 degrees, F is1＝Fz1。
The positive bending force transmitted to the straightening roll by the single supporting roll is as follows:
F2＝Fz2cosθ (2.2)
since the supporting roller is positioned right above the straightening roller, theta is 0 degrees, F is2＝Fz2。
The total negative bending force of all straightening rollers of the straightening machine is as follows:
Fsum1＝Fyf1+Fyf2+……Fyf7 (3.1)
the total positive bending force of all straightening rollers of the straightening machine is as follows:
Fsumm2＝Fyz1+Fyz2+……Fyz7 (3.2)
s2, establishing a relation among straightening force, roller bending force and straightening roller deflection, specifically:
the relationship between the roll bending force and the straightening force is established by adopting a material mechanics method as follows:
when the straightening roller is independently acted by straightening force:
in the formula (f)j(x) The distance between the straightening roll body and the left fulcrum is the deflection of x position, mm, under the action of straightening force; e is the elastic modulus of the straightening roll, MPa; i is the inertia moment of the cross section of the straightening roll body, N.mm; fjStraightening force, N; l represents the distance between the left fulcrum and the right fulcrum, mm; w represents the width of the strip in mm.
When acted upon by a roll bending force alone:
in the formula (f)w(x) The distance between the straightening roll body and the left fulcrum is the deflection of x position, mm, under the action of the roll bending force; e is the elastic modulus of the straightening roll, MPa; i is the inertia moment of the cross section of the straightening roll body, N.mm; fiRepresents the bending force, N, of the ith supporting roll; a isiThe distance between the ith supporting roller and the left fulcrum is represented as mm; biRepresents the roll body length of the ith supporting roll in mm; c. CiThe distance between the ith supporting roller and the right fulcrum is represented as mm; l represents the distance between the left and right fulcrums, mm.
The straightening roll target deflection function is:
f(x)＝fj(x)+fw(x) (4)
wherein f (x) is the deflection of the straightening roll body at the position with the distance of x from the left fulcrum.
S3, writing a program according to the steps, wherein the strip steel is positioned in the middle of the straightening roll, the maximum deflection generated by the straightening force can be proved to be positioned in the middle point of the roll body of the straightening roll, when the negative bending force is zero, the maximum deflection generated by the positive bending force is also positioned in the middle point of the roll body of the straightening roll, the middle point of the roll body of the straightening roll is selected as a characteristic point 1, and the deflection of the characteristic point 1 is set to be zero; assuming that the distance between two supporting points of the straightening roller is l, the coordinate of the characteristic point 1 is l/2, and then:
the required positive bending force is solved, and a roller-shaped curve is drawn, wherein the roller-shaped curve is in an M shape.
S4, selecting characteristic points 2 at the maximum deflection position on the M-shaped roller curve (the maximum deflection position is two, and the abscissa of any one position is taken as the abscissa of the characteristic point 2), and assuming that the abscissas of the characteristic points 1 and 2 are x respectively1And x2And simultaneously making the deflection of the characteristic point 1 and the deflection of the characteristic point 2 be zero, and making:
f(x1)＝fj(x1)+fw(x1)＝0 (6)
f(x2)＝fj(x2)+fw(x2)＝0 (7)
in the formula, x1＝l/2；x2The coordinate of the maximum deflection position on the roller-shaped curve is shown; the combined vertical type (6) and the formula (7) solve the positive bending force and the negative bending force, namely the positive bending force and the negative bending force required by a single straightening roll.
Taking the straightening force calculated for a certain steel grade (1500 mm in width) as an example, the roll bending force results are as follows:
TABLE 2 roll bending force calculation results
S5, distributing the positive bending force and the negative bending force to a positive bending hydraulic cylinder and a negative bending hydraulic cylinder;
assuming that the positive bending force provided by a single positive bending hydraulic cylinder is obtained according to an average distribution method as follows:
the negative bending force provided by a single negative bending hydraulic cylinder is as follows:
assuming that according to the proportionality coefficient method, the positive bending force provided by the single positive bending hydraulic cylinder at the inlet side can be obtained as follows:
the positive bending force provided by the single positive bending hydraulic cylinder on the outlet side is as follows:
the negative bending force provided by the single negative bending hydraulic cylinder at the inlet side is as follows:
the negative bending force provided by the single negative bending hydraulic cylinder on the outlet side is as follows:
s6, correcting the calculated positive bending force and negative bending force, wherein the correction needs to take the flatness of the strip steel plate as a target, and determining a correction coefficient according to an actual debugging result on site;
assuming a positive camber correction factor betapIs 0.9, negative bend correction coefficient betan0.85, the actual total positive bending force is:
Fpsa＝638.47×0.9＝574.623kN (11)
the actual total negative bending force is:
Fnsa＝373.27×0.85＝317.28kN (12)
the roll force distribution of the hydraulic cylinder also needs to be recalculated, and the description is omitted here.
Example two:
in the second embodiment, the equipment parameters of the leveler are the same as those in the first embodiment.
The negative bending force is zero, the deflection of the characteristic point 1 is zero, and the calculation result 1 is as follows:
TABLE 3 calculation of result 1
Then, the deflection of the characteristic point 1 and the deflection of the characteristic point 2 are zero, and the calculation result 2 is as follows:
TABLE 4 calculation results 2
In the calculation result 1, when the width of the strip steel is 1700mm and the straightening force is 20t, which is the most common situation, the solution can be obtained by using a double characteristic point method at the moment, and the figure is shown in fig. 3, fig. 4 and fig. 5; when the width is 800mm and the straightening force is 20t, a W-shaped curve appears, at the moment, the double characteristic point method is not solved, and only the single characteristic point method can be used, as shown in figure 6; when the width is 1700mm and the straightening force is 500t, the negative bending force is made zero, the calculated positive bending force exceeds the limit of the apparatus (400t), and only the step length delta can be set to gradually increase the negative bending force until the positive bending force is solved again, see fig. 7.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (9)
1. A method for setting the bending force of a straightener is characterized in that: the method comprises the following steps:
s1, for a certain straightening machine, cleaning the geometric relation among a hydraulic cylinder, a supporting roller and a straightening roller according to an equipment structure diagram;
s2, establishing a relation among straightening force, roller bending force and straightening roller deflection;
s3, enabling the negative bending force to be zero, selecting a characteristic point 1, enabling the deflection of the characteristic point 1 to be zero, solving the positive bending force at the moment, and drawing a roller-shaped curve;
s4, selecting a characteristic point 2, and simultaneously enabling the deflection of the characteristic point 1 and the deflection of the characteristic point 2 to be zero, and solving the positive bending force and the negative bending force at the moment, namely the positive bending force and the negative bending force required by a single straightening roll;
s5, distributing the positive bending force and the negative bending force to a positive bending hydraulic cylinder and a negative bending hydraulic cylinder;
and S6, correcting the calculated positive bending force and negative bending force.
2. The method for setting bending force of a leveler as set forth in claim 1, wherein: in step S1, the straightener has a plurality of straightening rolls, hydraulic cylinders and supporting rolls, the supporting rolls are grouped and arranged in the bending roll box, the supporting rolls are in direct contact with the straightening rolls and provide bending force, the positive bending hydraulic cylinder acts on a part of the bending roll box and then acts on the supporting rolls in the box to provide positive bending force, similarly, the negative bending hydraulic cylinder acts on a part of the bending roll box and then acts on the supporting rolls in the box to provide negative bending force, and then the positive bending force or the negative bending force provided by a single supporting roll is:
in the formula, FzPositive bending force or negative bending force is provided for a single supporting roller; fyThe bending force is the positive bending force or the negative bending force applied to a certain straightening roll; n is the number of the supporting rollers which provide positive bending force or negative bending force on a certain straightening roller;
the positive bending force or the negative bending force transmitted to the straightening roll by the single supporting roll is as follows:
F＝Fzcosθ (2)
in the formula, F is a positive bending force or a negative bending force transmitted to the straightening roll by a single supporting roll, theta is an included angle between the supporting roll and the straightening roll, and when the supporting roll is positioned right above the straightening roll, theta is 0 degree;
the total positive bending force or the total negative bending force required by the straightening machine is as follows:
Fsum＝Fy1+Fy2+……+Fyn (3)
in the formula, FsumThe total positive bending force or the total negative bending force required by the straightening machine; fy1To FynThe positive bending force or the negative bending force required for the 1 st to nth straightening rolls is solved according to steps S2 to S4.
3. The method for setting bending force of a leveler as set forth in claim 1, wherein: in step S2, the relationship between the straightening force, the roll bending force, and the deflection is:
f(x)＝fj(x)+fw(x) (4)
wherein f (x) is the deflection of a certain point x on the straightening roll body; f. ofj(x) The deflection at a certain point x on the roller body of the straightening roller under the action of straightening force; f. ofw(x) The deflection at a certain point x on the straightening roll body under the action of the roll bending force.
4. The method for setting bending force of a leveler as set forth in claim 3, wherein: in step S3, if the strip steel is positioned in the middle of the straightening roll, the maximum deflection generated by the straightening force is positioned at the middle point of the straightening roll body, when the negative bending force is zero, the maximum deflection generated by the positive bending force is also positioned at the middle point of the straightening roll body, the middle point of the straightening roll body is selected as a characteristic point 1, and the deflection of the characteristic point 1 is set to be zero; assuming that the distance between two supporting points of the straightening roller is l, the coordinate of the characteristic point 1 is l/2, and then:
the required positive bending force is solved and a roll-type curve is drawn.
5. The method for setting bending force of a leveler as set forth in claim 4, wherein: and if the solved positive bending force exceeds the bearing limit of the straightening machine, setting a step length delta, and gradually increasing the negative bending force until the positive bending force is solved again.
6. According to claimThe method for setting the bending force of the straightener in claim 4 is characterized in that: in step S4, the positions of feature point 1 and feature point 2 are assumed to be x, respectively1And x2Order:
f(x1)＝fj(x1)+fw(x1)＝0 (6)
f(x2)＝fj(x2)+fw(x2)＝0 (7)
in the formula, x1＝l/2；x2The horizontal coordinate of the maximum deflection position on the roller-shaped curve; the combined vertical type (6) and the formula (7) solve the positive bending force and the negative bending force.
7. The method for setting bending force of a leveler as set forth in claim 1, wherein: when the roll profile is "W", the roll bending force is set using the single characteristic point method, and step S4 is not performed.
8. The method for setting bending force of a leveler as set forth in claim 1, wherein: the distribution method of step S5 includes an average distribution method and a scale factor distribution method;
the average partition method is calculated as follows:
in the formula, FpcForce output for each positive or negative bending hydraulic cylinder; fbpPositive bending force or negative bending force required by a single straightening roll is calculated; n is a radical ofpThe number of the positive bending hydraulic cylinders or the negative bending hydraulic cylinders is;
the scaling factor method is calculated as follows:
if m upper straightening rolls are provided, i positive bending hydraulic cylinders are arranged at the inlet side of the strip steel and mainly act on the front n1An upper straightening roll, j positive bending hydraulic cylinders arranged on the outlet side of the strip steel and mainly acting on the nth2The distribution of the positive bending force to the last upper straightening roll is calculated as:
in the formula, alphapIs a proportionality coefficient; fbp1To Fbpn1Respectively 1# to n calculated1# positive bending force of the upper straightening roll; fbpn2To FbpmRespectively, is calculated n2Positive bending force of the upper straightening roll # to m #; fpc2The force is output by a single positive bending hydraulic cylinder at the inlet side of the strip steel; fbpCalculating the total positive bending force; and i is the number of positive bending hydraulic cylinders on the inlet side of the strip steel.
The proportional coefficient method of negative bending force is the same as the proportional coefficient method of positive bending force described above.
9. The method for setting bending force of a leveler as set forth in claim 1, wherein: in step S6, the correction needs to be performed by taking the flatness of the strip steel plate as a target, determining a correction coefficient according to an actual debugging result on site, and assuming that the positive bending correction coefficient is betapNegative bending correction coefficient of betanThe actually required positive and negative bending forces are then:
Fpsa＝Fpsc·βp (11)
Fnsa＝Fnsc·βn (12)
in the formula, FpsaActual total positive bending force; fpscCalculating the total positive bending force; fnsaFor actual total negative bending force, FnscIs the calculated total negative bending force.
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