CN113857295B - Setting method for bending force of straightener - Google Patents
Setting method for bending force of straightener Download PDFInfo
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- CN113857295B CN113857295B CN202111032264.1A CN202111032264A CN113857295B CN 113857295 B CN113857295 B CN 113857295B CN 202111032264 A CN202111032264 A CN 202111032264A CN 113857295 B CN113857295 B CN 113857295B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
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Abstract
The invention relates to a setting method of bending force of a straightener, which belongs to the field of plate straightening and comprises the following steps that S1, for a certain straightener, the geometric relationship among a hydraulic cylinder, a supporting roller and a straightening roller is clarified according to an equipment structure diagram; s2, establishing a relation among straightening force, bending force and deflection of the straightening roller; 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 roll profile curve; s4, selecting a characteristic point 2, enabling deflection of the characteristic point 1 and the characteristic point 2 to be zero, and solving positive bending force and negative bending force at the moment, namely positive bending force and negative bending force required by a single straightening roller; s5, distributing positive bending force and negative bending force to the positive bending hydraulic cylinder and the negative bending hydraulic cylinder; s6, correcting the calculated positive bending force and negative bending force. The invention solves the problem that the setting of the bending force of the current straightener is immature.
Description
Technical Field
The invention belongs to the field of plate straightening, and relates to a method for setting bending roller force of a straightener.
Background
The roller bending mechanism is widely applied to an advanced medium plate roller straightener and is one of important means for controlling the strip steel plate shape, but no mature method exists for setting the roller bending force at present. The invention provides a method, which comprises the steps of firstly establishing a 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 deflection of characteristic points of a straightening roller as an objective function.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for setting the bending force of a straightener, which solves the problem that the setting of the bending force of the straightener is not mature currently.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a setting method of bending force of a straightener comprises the following steps:
s1, for a certain straightener, the geometric relationship among a hydraulic cylinder, a supporting roller and a straightening roller is clarified according to an equipment structure diagram;
s2, establishing a relation among straightening force, bending force and deflection of the straightening roller;
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 roll profile curve;
s4, selecting a characteristic point 2, enabling deflection of the characteristic point 1 and the characteristic point 2 to be zero, and solving positive bending force and negative bending force at the moment, namely positive bending force and negative bending force required by a single straightening roller;
s5, distributing positive bending force and negative bending force to the positive bending hydraulic cylinder and the negative bending hydraulic cylinder;
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 arranged in groups in a roller box, the supporting rollers are in direct contact with the straightening rollers and provide roller bending force, the positive bending hydraulic cylinder acts on a part of the roller box and then acts on the supporting rollers in the box to provide positive bending force, and similarly, the negative bending hydraulic cylinder acts on a part of the roller box and then acts on the supporting rollers in the box to provide negative bending force, so that the positive bending force or the negative bending force provided by the single supporting roller is:
wherein F is z Positive or negative bending force provided for a single backup roll; f (F) y Positive bending force or negative bending force applied to a certain straightening roller; n is the number of the supporting rollers for providing 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 roller by the single supporting roller is as follows:
F＝F z cosθ (2)
wherein F is positive bending force or negative bending force transmitted to the straightening roller by the single supporting roller, theta is an included angle between the supporting roller and the straightening roller, and when the supporting roller is positioned right above the straightening roller, theta=0 degree;
the total positive bending force or the total negative bending force required by the straightener is as follows:
F sum ＝F y1 +F y2 +……+F yn (3)
wherein F is sum The total positive bending force or the total negative bending force required by the straightener; f (F) y1 To F yn And (3) solving the positive bending force or the negative bending force required by the 1 st straightening roller to the n th straightening roller according to the steps S2 to S4.
Further, in step S2, the relationship among the straightening force, the bending force and the deflection is:
f(x)＝f j (x)+f w (x) (4)
wherein f (x) is the deflection of a certain point x on the roll body of the straightening roll; f (f) j (x) Deflection at a certain point x on the roller body of the straightening roller under the action of straightening force; f (f) w (x) Is the deflection of a certain point x on the roll body of the straightening roll under the action of bending force.
Further, in step S3, if the strip steel is located at the middle of the straightening roll, the maximum deflection generated by the straightening force is located at the middle point of the roll body of the straightening roll, and when the negative bending force is zero, the maximum deflection generated by the positive bending force is also located at 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 fulcrums of the straightening roller is l, the coordinate of the characteristic point 1 is l/2, and at this time, the following steps are:
thereby solving the required positive bending force and drawing a roll shape curve.
Further, if the positive bending force is beyond the bearing limit of the straightener, the step delta is set to gradually increase the negative bending force until the positive bending force is obtained again.
Further, in step S4, it is assumed that the positions of the feature point 1 and the feature point 2 are x, respectively 1 And x 2 And (3) making:
f(x 1 )＝f j (x 1 )+f w (x 1 )＝0 (6)
f(x 2 )＝f j (x 2 )+f w (x 2 )＝0 (7)
wherein x is 1 ＝l/2；x 2 The abscissa of the maximum deflection position on the roll profile curve; the combined type (6) and the formula (7) solve positive bending force and negative bending force.
Further, when the roll profile is "W" type, the single feature point method is used to set the bending force, and step S4 is not performed.
Further, the allocation method of step S5 includes an average allocation method and a scaling factor allocation method;
the average distribution method is calculated as follows:
wherein F is pc A force output for each positive or negative bending cylinder; f (F) bp The positive bending force or the negative bending force required by the calculated single straightening roller; n (N) p The number of the hydraulic cylinders is positive bending hydraulic cylinders or negative bending hydraulic cylinders;
the scaling factor method is calculated as follows:
assuming that m upper straightening rollers are arranged, i positive bending hydraulic cylinders are arranged at the inlet side of the strip steel and mainly act on the front n 1 The upper straightening roller has j positive bending hydraulic cylinders on the strip steel outlet side and mainly acts on the nth one 2 From one to the last upper straightening roll, the distribution of the positive bending force is calculated as:
wherein alpha is p Is a proportionality coefficient; f (F) bp1 To F bpn1 Calculated 1# to n respectively 1 Positive bending force of upper straightening roll; f (F) bpn2 To F bpm Respectively calculated n 2 Positive bending force of straightening roller on # to m#; f (F) pc2 The force output by a single positive bending hydraulic cylinder at the inlet side of the strip steel; f (F) bp For the calculated total positive bending force; i is the inlet side of the strip steelIs arranged in the hydraulic cylinder number of the positive bending machine.
The method for distributing the negative bending force by the proportionality coefficient method is the same as the method for distributing the positive bending force by the proportionality coefficient method.
Further, in step S6, correction is required to be aimed at flattening the strip steel plate shape, a correction coefficient is determined according to the actual debugging result on site, and the positive bending correction coefficient is assumed to be beta p Negative bend correction coefficient is beta n The positive and negative bending forces actually required are:
F psa ＝F psc ·β p (11)
F nsa ＝F nsc ·β n (12)
wherein F is psa Is the actual total positive bending force; f (F) psc For the calculated total positive bending force; f (F) nsa F is the actual total negative bending force nsc To calculate the total negative bending force.
The invention has the beneficial effects that:
the invention 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 points of the straightening roller as an objective function. On the premise of knowing the straightening force, the required 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 objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in the following preferred detail with reference to the accompanying drawings, in which:
FIG. 1 is a geometric relationship among a backup 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 roll body of the straightening roll; l is the distance between two fulcra; w is the width of the strip steel; a, a 1 The distance from the first support roller to the left fulcrum is the distance from the first support roller to the left fulcrum; b 1 The length of the roller body is the length of the supporting roller; c 1 The distance from the first support roller to the right fulcrum is the distance from the first support roller to the right fulcrum;
FIG. 2 is a schematic view of the structure of the 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 rollers are provided, 3 roller bending boxes are arranged on each upper straightening roller, 4 supporting rollers are arranged in one roller bending box, the hydraulic cylinders are positioned on the roller bending boxes, 4 positive bending hydraulic cylinders are arranged in the middle of the hydraulic cylinders, and two negative bending hydraulic cylinders are arranged on the two sides of the hydraulic cylinders respectively;
FIG. 3 is a roll profile of calculation result 1 when the strip width is 1700mm and the straightening force is 20 t;
FIG. 4 is a roll profile of calculation result 2 when the strip width is 1700mm and the straightening force is 20 t;
FIG. 5 is a graph showing the comparison of calculation result 1 and calculation result 2 when the strip width is 1700mm and the straightening force is 20 t;
FIG. 6 is a roll profile of the calculation result of the single feature point method when the strip width is 800mm and the straightening force is 20 t;
FIG. 7 is a graph showing the comparison of calculation result 1 and calculation result 2 when the strip width is 1700mm and the straightening force is 500 t.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present invention by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to limit the invention; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated 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 numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present invention, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.
Embodiment one:
there are 15 roll straighteners in which 7 upper rolls, 8 lower rolls, each upper roll is provided with 12 support rolls, located in 3 roll boxes. Schematic diagrams of the apparatus are shown in fig. 1 and 2. The following assumptions are now made:
(1) The acting force of the hydraulic cylinder can be completely transmitted to the supporting roller to be used as the bending force of the supporting roller to the straightening roller (the bending force is divided into positive bending force and negative bending force according to different acting points);
(2) The middle positive bending force only acts on the middle 6 supporting rollers on a certain straightening roller, the acting forces are distributed evenly, the left negative bending force only acts on the left 3 supporting rollers on a certain straightening roller, the acting forces are distributed evenly, the right negative bending force only acts on the right 3 supporting rollers on a certain straightening roller, and the acting forces are distributed evenly;
(3) The support roller is positioned right above the straightening roller.
(4) The forces are symmetrically applied, i.e. the negative bending force on the left and the negative bending force on the right are equal.
According to such an assumption, the method for setting the bending force of the leveler includes the steps of:
s1, as shown in figures 1 and 2, the geometric relationship among a hydraulic cylinder, a supporting roller and a straightening roller is cleared; that is, the leveler has 7 upper rolls and 8 lower rolls, each of which is provided with 12 supporting rolls in 3 roll boxes. The hydraulic cylinders are positioned on the bending roll box, the middle part of the hydraulic cylinder is provided with 4 positive bending hydraulic cylinders, and two negative bending hydraulic cylinders are respectively arranged at the two sides of the hydraulic cylinder.
The positive and negative bending forces required under each set of straightening forces can be calculated and then added up to obtain 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 at the two sides.
The middle 4 positive bending hydraulic cylinders can provide a maximum positive bending force of 400 tons, and the single side of each side of the 2 negative bending hydraulic cylinders can provide a maximum negative bending force of 200 tons. The elastic modulus of the straightening roller is 208000MPa, the length L of the roller body is 2000mm, the roller diameter of the straightening roller is 120mm, the distance d between the left fulcrum and the roller body (and the distance between the right fulcrum and the roller body) is 55mm, and the geometrical parameters (unit: mm) of the supporting roller are as follows:
table 1 geometrical parameters of the backup roll
The negative bending force of the left and right negative bending hydraulic cylinders is as follows:
wherein F is yl Providing a left hydraulic cylinder with a negative bending force on a certain straightening roller; f (F) yr Providing a right hydraulic cylinder with a negative bending force on a certain straightening roller; f (F) yf Is the total negative bending force on a certain straightening roll.
The negative bending force provided by the single support roller is:
wherein F is z1 For a single support of the left 3 and right 3 support rollersThe negative bending force provided by the supporting roller.
The positive bending force provided by the single support roller is:
wherein F is yz Is the total positive bending force on a certain straightening roller; f (F) z2 Positive bending force is provided for a single backup roll of the middle 6 backup rolls.
The negative bending force transmitted to the straightening roller by the single supporting roller is as follows:
F 1 ＝F z1 cosθ (2.1)
since the support roller is located directly above the straightening roller, θ=0°, F 1 ＝F z1 。
The positive bending force transmitted to the straightening roller by the single supporting roller is as follows:
F 2 ＝F z2 cosθ (2.2)
since the support roller is located directly above the straightening roller, θ=0°, F 2 ＝F z2 。
The total negative bending force of all straightening rollers of the straightener is as follows:
F sum1 ＝F yf1 +F yf2 +……F yf7 (3.1)
the total positive bending force of all straightening rollers of the straightener is as follows:
F summ2 ＝F yz1 +F yz2 +……F yz7 (3.2)
s2, establishing a relation among straightening force, bending force and deflection of the straightening roller, and 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 roll is subjected to straightening force alone:
wherein f j (x) The deflection of the position x is mm, which is the distance between the roll body and the left fulcrum of the straightening roll under the action of straightening force; e is the elastic modulus of the straightening roller and MPa; i is the moment of inertia of the section of the roll body of the straightening roll, N.mm; f (F) j For straightening force, N; l represents the distance between the left fulcrum and the right fulcrum, and mm; w represents the width of the strip steel, mm.
When subjected to bending forces alone:
wherein f w (x) The deflection of the roll body of the straightening roll is x mm under the action of bending force; e is the elastic modulus of the straightening roller and MPa; i is the moment of inertia of the section of the roll body of the straightening roll, N.mm; f (F) i A roll bending force of the ith support roll, N; a, a i Representing the distance of the left pivot of the ith support roll gap, and mm; b i Represents the length of the roll body of the ith support roll, mm; c i Representing the distance of the right fulcrum of the ith supporting roll gap, and mm; l represents the distance between the left and right fulcrums, and mm.
The straightening roll target deflection function is:
f(x)＝f j (x)+f w (x) (4)
wherein f (x) is deflection of the straightening roll at the position where the distance between the roll body and the left fulcrum is x.
S3, programming according to the steps, wherein the strip steel is positioned in the middle of the straightening roller, and the maximum deflection generated by the straightening force can be proved to be positioned at the middle point of the roller body of the straightening roller, 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 roller body of the straightening roller, the middle point of the roller body of the straightening roller 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 fulcrums of the straightening roller is l, the coordinate of the characteristic point 1 is l/2, and at this time, the following steps are:
thus, the required positive bending force is solved, and a roll shape curve is drawn, wherein the roll shape curve is in an M shape.
S4, selecting a characteristic point 2 at the position with the maximum deflection on the M-shaped roller curve (two positions with the maximum deflection are arranged, and any abscissa is taken as the abscissa of the characteristic point 2), wherein the abscissas of the characteristic point 1 and the characteristic point 2 are respectively x 1 And x 2 Simultaneously, the deflection of the characteristic points 1 and 2 is set to be zero, and the following steps are carried out:
f(x 1 )＝f j (x 1 )+f w (x 1 )＝0 (6)
f(x 2 )＝f j (x 2 )+f w (x 2 )＝0 (7)
wherein x is 1 ＝l/2；x 2 The coordinates of the position with the maximum deflection on the roller profile curve; and (3) solving positive bending force and negative bending force by the combined type (6) and the formula (7), namely positive bending force and negative bending force required by a single straightening roller.
Taking the straightening force calculated for a certain steel grade (width 1500 mm) as an example, the calculated roll bending force results are as follows:
TABLE 2 calculation of roll bending force
S5, distributing positive bending force and negative bending force to the positive bending hydraulic cylinder and the negative bending hydraulic cylinder;
assuming that the single positive bending cylinder provides the positive bending force according to the average distribution method:
the negative bending force provided by the single negative bending hydraulic cylinder is as follows:
assuming a scaling factor method, the positive bending force provided by a single positive bending cylinder on the inlet side is available as:
the positive bending force provided by the outlet side single positive bending hydraulic cylinder is as follows:
the negative bending force provided by the inlet side single negative bending hydraulic cylinder is as follows:
the negative bending force provided by the outlet side single negative bending hydraulic cylinder is as follows:
s6, correcting the calculated positive bending force and negative bending force, wherein the correction needs to take strip steel plate shape flatness as a target, and a correction coefficient is determined according to an actual field debugging result;
assuming positive bend correction coefficient beta p A negative bend correction coefficient beta of 0.9 n 0.85, the actual total positive bending force is:
F psa ＝638.47×0.9＝574.623kN (11)
the actual total negative bending force is:
F nsa ＝373.27×0.85＝317.28kN (12)
the roll force distribution of the hydraulic cylinder also needs to be recalculated, and is not repeated here.
Embodiment two:
in the second embodiment, the straightener equipment parameters are the same as in the first embodiment.
Let the negative bending force be zero, the deflection of the characteristic point 1 be zero, and the calculation result 1 is as follows:
TABLE 3 calculation result 1
And then the deflection of the characteristic points 1 and 2 is set to be zero, and the calculation result 2 is as follows:
table 4 calculation result 2
In the calculation result 1, when the width of the strip steel is 1700mm and the straightening force is 20t, the strip steel is the most common condition, and the strip steel can be solved by a double-feature point method at the moment, see fig. 3, 4 and 5; when the width is 800mm and the straightening force is 20t, a W-shaped curve appears, and the double-characteristic point method has no solution and can only be used by a single-characteristic point method, as shown in fig. 6; when the width is 1700mm and the straightening force is 500t, the negative bending force is zero, the calculated positive bending force exceeds the equipment limit (400 t), the step delta can only be set, and the negative bending force is gradually increased until the positive bending force is calculated again, as shown in fig. 7.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.
Claims (9)
1. A setting method of bending force of a straightener is characterized in that: the method comprises the following steps:
s1, for a certain straightener, the geometric relationship among a hydraulic cylinder, a supporting roller and a straightening roller is clarified according to an equipment structure diagram;
s2, establishing a relation among straightening force, bending force and deflection of the straightening roller;
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 roll profile curve;
s4, selecting a characteristic point 2, enabling deflection of the characteristic point 1 and the characteristic point 2 to be zero, and solving positive bending force and negative bending force at the moment, namely positive bending force and negative bending force required by a single straightening roller;
s5, distributing positive bending force and negative bending force to the positive bending hydraulic cylinder and the negative bending hydraulic cylinder;
s6, correcting the calculated positive bending force and negative bending force.
2. The method for setting a roll bending force of a leveler according to claim 1, wherein: in step S1, the straightener has a plurality of straightening rollers, hydraulic cylinders and backup rolls, the backup rolls are arranged in a roll bending box in groups, the backup rolls are in direct contact with the straightening rollers and provide roll bending force, the positive bending hydraulic cylinder acts on a part of the roll bending box and then acts on the backup rolls in the box to provide positive bending force, and similarly, the negative bending hydraulic cylinder acts on a part of the roll bending box and then acts on the backup rolls in the box to provide negative bending force, and then the positive bending force or the negative bending force provided by a single backup roll is:
（1）
in the method, in the process of the invention,provided for a single backing rollPositive or negative bending forces; />Positive bending force or negative bending force applied to a certain straightening roller; />The number of the supporting rollers for providing positive bending force or negative bending force for a certain straightening roller;
the positive bending force or the negative bending force transmitted to the straightening roller by the single supporting roller is as follows:
（2）
in the method, in the process of the invention,for the positive or negative bending force transferred by the single support roll to the straightening roll, +.>For the angle between the support roller and the straightening roller, when the support roller is located right above the straightening roller, < +.>；
The total positive bending force or the total negative bending force required by the straightener is as follows:
（3）
in the method, in the process of the invention,the total positive bending force or the total negative bending force required by the straightener; />To->Is the first1 straightening roll to->And (3) solving the positive bending force or the negative bending force required by the straightening rollers according to the steps S2-S4.
3. The method for setting a roll bending force of a leveler according to claim 1, wherein: in the step S2, the relation among straightening force, bending force and deflection is as follows:
（4）
in the method, in the process of the invention,for straightening a certain point on the roll body>Deflection at the location; />For straightening a certain point on the roll body of the straightening roll under the action of straightening force>Deflection at the location; />For straightening a certain point on the roll body under the action of bending force>Deflection at the location.
4. The method for setting a roll bending force of a leveler according to claim 3, wherein: in step S3, if the strip steel is positioned in the middle of the straightening roller, the maximum deflection generated by the straightening force is positioned at the middle point of the roller body of the straightening roller, and 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 roller body of the straightening roller, and the straightening is selectedThe middle point of the straight roller body is a characteristic point 1, and the deflection of the characteristic point 1 is set to be zero; assuming that the distance between two fulcrums of the straightening roller isThe coordinates of feature point 1 are +.>At this time, let:
（5）
thereby solving the required positive bending force and drawing a roll shape curve.
5. The method for setting a roll bending force of a leveler according to claim 4, wherein: if the positive bending force is beyond the bearing limit of the straightener, setting step lengthThe negative bending force is gradually increased until the positive bending force is found again.
6. The method for setting a roll bending force of a leveler according to claim 4, wherein: in step S4, it is assumed that the positions of the feature point 1 and the feature point 2 are respectivelyAnd->And (3) making:
（6）
（7）
in the method, in the process of the invention,；/>the abscissa of the maximum deflection position on the roll profile curve; the combined type (6) and the formula (7) solve positive bending force and negative bending force.
7. The method for setting a roll bending force of a leveler according to claim 1, wherein: when the roll profile is of the "W" type, the single feature point method is used to set the roll bending force, and step S4 is not performed.
8. The method for setting a roll bending force of a leveler according to claim 1, wherein: the distribution method in the step S5 comprises an average distribution method and a proportional coefficient distribution method;
the average distribution method is calculated as follows:
（8）
in the method, in the process of the invention,a force output for each positive or negative bending cylinder; />The positive bending force or the negative bending force required by the calculated single straightening roller; />The number of the hydraulic cylinders is positive bending hydraulic cylinders or negative bending hydraulic cylinders;
the scaling factor method is calculated as follows:
assuming that there isThe upper straightening roller is provided with +.>The positive bending hydraulic cylinder mainly acts on the front +.>The upper straightening roller is provided with +.>A positive bending hydraulic cylinder mainly acting on the +.>From one to the last upper straightening roll, the distribution of the positive bending force is calculated as:
（9）
（10）
in the method, in the process of the invention,is a proportionality coefficient; />To->Calculated 1# to +.>Positive bending force of upper straightening roll; />To->Calculated +.># to->Positive bending force of upper straightening roll; />The force output by a single positive bending hydraulic cylinder at the inlet side of the strip steel; />For the calculated total positive bending force; />The number of the positive bending hydraulic cylinders at the inlet side of the strip steel;
the method for distributing the negative bending force by the proportionality coefficient method is the same as the method for distributing the positive bending force by the proportionality coefficient method.
9. The method for setting a roll bending force of a leveler according to claim 1, wherein: in step S6, correction is performed by taking strip steel plate shape flatness as a target, determining a correction coefficient according to an actual debugging result on site, and assuming that the positive bending correction coefficient isNegative bend correction factor of +.>The positive and negative bending forces actually required are:
（11）
（12）
in the method, in the process of the invention,is the actual total positive bending force; />For the calculated total positive bending force; />For the actual total negative bending force +.>To calculate the total negative bending force.
Priority Applications (1)
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