CN115415361A - Straightening machine roller bending force setting method based on particle swarm optimization - Google Patents

Abstract

The invention relates to a straightening machine roller bending force setting method based on a particle swarm algorithm, which belongs to the technical field of plate straightening and comprises the following steps of: s1: according to the equipment structure of the straightening machine, establishing the geometric relationship among a hydraulic cylinder, a straightening roller and a supporting roller; s2: establishing a function model of the deflection of the straightening roll about straightening force and roll bending force; s3: solving positive bending force and negative bending force when the deflection of the straightening roll is minimum by adopting a particle swarm algorithm; s4: distributing the positive bending force and the negative bending force to a positive bending hydraulic cylinder and a negative bending hydraulic cylinder; s5: the positive bending force and the negative bending force are corrected. 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 distribution 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.

Description

Bending force setting method of straightening machine based on particle swarm algorithm

technical field

The invention belongs to the technical field of plate straightening, and relates to a method for setting the bending force of a straightening machine based on a particle swarm algorithm.

Background technique

Straightening machines are widely used in various strip steel production lines such as hot rolling, cold rolling, and heat treatment. At present, the third-generation straightening machine has a pressing mechanism and a bending mechanism. In order to fully utilize the capabilities of the equipment, it is necessary to accurately set the pressing and bending. At present, compared with the reduction, the setting of the bending roll is more difficult, and there is no mature technical solution.

Contents of the invention

In view of this, the object of the present invention is to provide a method for setting the bending force of a straightener based on the particle swarm algorithm. Under the premise of the force, the minimum deflection of the straightening roller is the goal, and the required bending force is calculated.

To achieve the above object, the present invention provides the following technical solutions:

A method for setting the bending force of a straightening machine based on particle swarm optimization, comprising the following steps:

S1: According to the equipment structure of the straightening machine, establish the geometric relationship of the hydraulic cylinder, straightening roller and support roller;

S2: Establish a function model of straightening roller deflection with respect to straightening force and bending force;

S3: Use the particle swarm algorithm to find the positive bending force and negative bending force when the deflection of the straightening roller is the smallest;

S4: distribute the positive bending force and negative bending force to the positive bending hydraulic cylinder and the negative bending hydraulic cylinder;

S5: Correct the positive bending force and negative bending force.

Further, the straightening machine includes a bending roll box, and a plurality of straightening rolls, hydraulic cylinders and support rolls; the support rolls are arranged in groups in the bending roll box, and the straightening rolls are arranged under the bending roll box, so The support roll is in contact with the straightening roll and provides roll bending force; the hydraulic cylinder is located at the upper end of the roll bending box, and the hydraulic cylinder includes a positive bending hydraulic cylinder and a negative bending hydraulic cylinder, and the positive bending hydraulic cylinder provides positive bending force for the support roll. Bending force, the negative bending hydraulic cylinder provides negative bending force for the support roller.

Further, in step S1, the establishment of the geometric relationship of the hydraulic cylinder, the straightening roller, and the support roller includes:

The positive or negative bending force provided by a single support roller is:

In the formula, F _z is the positive bending force or negative bending force provided by a single support roll on each straightening roll; F _w is the total positive or negative bending force received by each straightening roll; N is the bending force of each straightening roll The number of support rolls providing positive or negative bending force on straight rolls;

The positive or negative bending force transmitted by a single support roll to the straightening roll is:

F＝F _z cosθ (2)

In the formula, F is the positive bending force or negative bending force transmitted to the straightening roller by a single supporting roller; θ is the angle between the supporting roller and the straightening roller, when the supporting roller is located directly above the straightening roller, θ=0° ;

The total positive or negative bending force required for the leveler is:

F _sum ＝F _w1 +F _w2 +...+F _wn (3)

In the formula, F _sum is the total positive or negative bending force required by the straightening machine; F _w1 to F _wn are the positive or negative bending forces required from the first straightening roll to the nth straightening roll force.

Further, the function model of the straightening roll deflection described in step S2 about straightening force and roll bending force is:

_f (x)＝ _fj (x)+fw(x) (4)

In the formula, f(x) is the deflection at a point x on the straightening roller body; f _j (x) is the deflection at a certain point x on the straightening roller body under the action of straightening force; f _w (x) is the bending The deflection at a point x on the straightening roller body under the action of the roller force.

Further, step S3 specifically includes the following steps:

S31: Set the range of the initial positive bending force and negative bending force to [0, F _ji ], where F _ji is the straightening force of the current straightening roller;

S32: Set the hyperparameters of the particle swarm optimization algorithm, including the population number n _g , the self-awareness item learning factor c ₁ , the group-awareness item learning factor c ₂ , the maximum variation v _max allowed for each iteration, and the inertia factor ω;

S33: Initialize the population, substitute the initial positive bending force and negative bending force into the objective function, and calculate the individual optimal value and group optimal value of the population, where the objective function is:

max[φ(F _zi ,F _fi )]=max[-|f(x)|] (5)

S34: Calculate the increment of the independent variable at the kth iteration, where the inertia factor of the kth iteration is:

The independent variable increment of the kth iteration is:

v ^k ＝ω ^k ·v ^k-1 +c ₁ ·R _a ·(p _b -x ^k-1 )+c ₂ ·R _a ·(g _b -x ^k-1 ) (7)

In the formula, ω ^k is the inertia factor at the kth iteration, ω _ini is the initial inertia factor, ω _end is the final inertia factor, n _iter is the iteration number, n is the current iteration number, n∈[0,n _iter ], x ^k-1 is the independent variable at the k-1th iteration, x ^k ＝x ^k-1 +v ^k , R _a is a random number between (0,1), p _b is the individual optimal value, g _b is the optimal value of the population;

S35: update the independent variable, and obtain a new objective function value;

S36: updating the individual optimal value and group optimal value of the population;

S37: Repeat S34-S36 until the number of iterations is reached or the target accuracy is reached;

S38: Repeat S31-S37 until the positive bending force and negative bending force required by all the upper straightening rollers are calculated;

S39: Calculate the total positive bending force and negative bending force, check whether it exceeds the limit, if it exceeds the limit, reset the range of the initial positive bending force and negative bending force, and repeat S31-S38.

Further, as described in step S4, the positive bending force and the negative bending force are distributed to the positive bending hydraulic cylinder and the negative bending hydraulic cylinder, and the average distribution method is adopted:

In the formula, F _op is the force output by each positive bending hydraulic cylinder or negative bending hydraulic cylinder; F _sb is the calculated total positive roll bending force or total negative bending roll force; N _op is the positive bending hydraulic cylinder or negative bending hydraulic cylinder The number of curved hydraulic cylinders.

Further, as described in step S4, the positive bending force and the negative bending force are distributed to the positive bending hydraulic cylinder and the negative bending hydraulic cylinder, and the proportional coefficient distribution method is adopted:

Assuming that there are m upper straightening rollers, there are i positive bending hydraulic cylinders on the strip inlet side, which mainly act on the first n ₁ upper straightening rollers, and j positive bending hydraulic cylinders on the strip steel exit side, mainly acting on the nth ₂ to the last upper straightening roller, the output force of a single positive bending cylinder on the entrance side is:

In the formula, F _op2 is the output force of a single positive bending cylinder on the entrance side; F _bp1 to F _bpn1 are the positive bending forces required from 1# straightening roll to n1# straightening roll, F _bpn2 to F _bpm position n2# straightening The positive bending force required by the roll to the m# straightening roll; F _bp is the calculated total positive bending force; α _p is the positive bending force proportional coefficient on the entrance side; i is the number of positive bending hydraulic cylinders on the entrance side ;

The output force of each negative bending hydraulic cylinder and the output force of the outlet side hydraulic cylinder are calculated by formulas (9) and (10).

Further, in the step S5, the correction needs to aim at the flatness of the strip steel plate, and determine the correction coefficient according to the actual commissioning results on site. Assuming that the positive bending correction coefficient is β _p and the negative bending correction coefficient is β _n , the actual required The positive and negative bending forces of are:

F _ap = F _sz ·β _p (11)

F _an =F _sf ·β _n (12)

In the formula, F _ap is the actual total positive bending force; F _an is the actual total negative bending force; F _sz is the calculated total positive bending force; F _sf is the calculated total negative bending force; β _p is the positive bending force Correction coefficient; β _n is the negative bending correction coefficient.

The beneficial effect of the present invention is that: the present invention first establishes the relationship between the bending force of the hydraulic cylinder and the bending force provided by each support roll, and then uses the deflection distribution of the straightening roll as the objective function to set the bending force . On the premise of known straightening force, the required bending force can be calculated.

Other advantages, objects and features of the present invention will be set forth in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the investigation and research below, or can be obtained from It is taught in the practice of the present invention. The objects and other advantages of the invention may be realized and attained by the following specification.

Description of drawings

In order to make the purpose of the present invention, technical solutions and advantages clearer, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

Fig. 1 is the positional relation of straightening roller and support roller of the present invention;

Fig. 2 is the top view of straightener described in the present invention;

Fig. 3 is the roll profile curve of 1# roll when calculating for the first time in the embodiment of the present invention;

Fig. 4 is the roll profile curve of 1# roll when calculating for the second time in the embodiment of the present invention;

Fig. 5 is the roll profile curve of 1# roll when calculating for the third time in the embodiment of the present invention;

Fig. 6 is the roll profile curve of 1# roll when calculating for the 4th time in the embodiment of the present invention;

Fig. 7 is the roll shape curve of the 1# roll in the fifth calculation in the embodiment of the present invention.

detailed description

Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic concept of the present invention, and the following embodiments and the features in the embodiments can be combined with each other in the case of no conflict.

Wherein, the accompanying drawings are for illustrative purposes only, and represent only schematic diagrams, rather than physical drawings, and should not be construed as limiting the present invention; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, Enlargement or reduction does not represent the size of the actual product; for those skilled in the art, it is understandable that certain known structures and their descriptions in the drawings may be omitted.

In the drawings of the embodiments of the present invention, the same or similar symbols correspond to the same or similar components; , "front", "rear" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred devices or elements must It has a specific orientation, is constructed and operated in a specific orientation, so the terms describing the positional relationship in the drawings are for illustrative purposes only, and should not be construed as limiting the present invention. For those of ordinary skill in the art, the understanding of the specific meaning of the above terms.

The present invention proposes a method for setting the bending force of straightening machine based on particle swarm algorithm. The existing 15-roll straightening machine includes 7 upper rolls and 8 lower rolls, and each upper roll is equipped with 12 support rolls. Comes in 3 bent roll boxes. As shown in Figure 1, d is the distance from the left fulcrum to the roll body, l is the length of the straightening roll body; L is the distance between the two fulcrums; W is the strip width; a ₁ is the distance from the first support roll to the left fulcrum distance; b ₁ is the length of the support roll body; c ₁ is the distance from the first support roll to the right fulcrum. As shown in Figure 2, the entrance side is the side where the strip steel enters, and the exit side is the side where the strip steel goes out. The support rolls are in a bending box, and the hydraulic cylinders are located on the bending box. There are 4 positive bending hydraulic cylinders in the middle and two negative bending hydraulic cylinders on each side.

Now make the following assumptions:

(1) The force of the roll bending hydraulic cylinder can be completely transmitted to the support roll as the bending force of the support roll to the straightening roll;

(2) The positive bending force in the middle only acts on the middle 6 support rollers on a certain straightening roller, and the force is evenly distributed. Similarly, the negative bending force on the left only acts on the 3 support rollers on the left of a certain straightening roller The negative bending force on the right only acts on the three support rollers on the right side of a straightening roller, and the force is evenly distributed;

(3) The support roller is located directly above the straightening roller.

(4) The force is applied symmetrically, that is, the negative bending force on the left side is equal to the negative bending force on the right side.

According to this assumption, the setting method of the bending force of the straightening machine includes the following steps:

(1) As shown in Figure 1 and Figure 2, clarify the geometric relationship between hydraulic cylinders, support rolls, and straightening rolls; that is, the straightening machine has 7 upper rolls and 8 lower rolls, and each upper roll is equipped with 12 support rolls in 3 bending roll boxes. The hydraulic cylinders are located on the bending roll box, with 4 positive bending hydraulic cylinders in the middle and two negative bending hydraulic cylinders on each side.

The positive bending force and negative bending force required under each set of straightening forces can be calculated, and then added up to obtain the total positive bending force and total negative bending force. The total positive bending force is distributed by the four positive bending hydraulic cylinders in the middle, and the total negative bending force is distributed by the negative bending hydraulic cylinders on both sides.

The 4 positive bending hydraulic cylinders in the middle can provide a maximum positive bending force of 400 tons in total, and the 2 negative bending hydraulic cylinders on each side can provide a maximum negative bending force of 200 tons on one side. The elastic modulus of the straightening roller is 208000MPa, the length of the roller body is 2000mm, the diameter of the straightening roller is 120mm, the distance between the fulcrums on both sides of the roller body is 55mm, and the geometric parameters (unit: mm) of the supporting roller are as follows:

Table 1

a b c 1# 142.5 100 1867.5 2# 287.5 100 1722.5 3# 432.5 100 1577.5 4# 577.5 100 1432.5 5# 787.5 100 1222.5 6# 932.5 100 1077.5 7# 1077.5 100 932.5 8# 1222.5 100 787.5 9# 1432.5 100 577.5 10# 1577.5 100 432.5 11# 1722.5 100 287.5 12# 1867.5 100 142.5

Then the negative bending force provided by a single support roller is:

In the formula, F _yl is the negative bending force provided by the left hydraulic cylinder to a certain straightening roller; F _yr is the negative bending force provided by the right hydraulic cylinder to a certain straightening roller; F _yf is the negative bending force on a certain straightening roller The total negative bending force; F _z1 is the negative bending force provided by the single support rollers on the left and right sides.

Then the positive bending force provided by a single support roller is:

In the formula, F _yz is the total positive bending force on a certain straightening roll; F _z2 is the positive bending force provided by a single support roll among the six support rolls in the middle.

Then the negative bending force transmitted by a single support roller to the straightening roller is:

F ₁ =F _z1 ·cosθ (16)

Since the support roller is located directly above the straightening roller, θ=0°, then F ₁ =F _z1 .

The positive bending force transmitted by a single support roll to the straightening roll is:

F ₂ =F _z2 ·cosθ (17)

Since the support roller is directly above the straightening roller, θ=0°, then F ₂ =F _z2 .

The total negative bending force of all the straightening rollers of the straightening machine is:

F _sum1 =F _yf1 +F _yf2 +...+F _yf7 (18)

The total positive bending force of all the straightening rollers of the straightening machine is:

F _sum2 =F _yz1 +F _yz2 +...+F _yz7 (19)

(2) Set up the function model of straightening roll deflection about straightening force, bending roll force, specifically:

The relationship between bending force and straightening force is established by the method of material mechanics as follows:

When subjected to straightening force alone:

In the formula, f _j (x) is the deflection at the distance x from the left fulcrum, mm; E is the elastic modulus of the straightening roller, MPa; I is the moment of inertia of the cylindrical section, N mm; F _j is the straightening Straight force, N; l is the distance between two fulcrums, mm; w is the width of the strip steel, mm.

When subjected to bending force alone:

In the formula, f _w (x) is the deflection at the distance x from the left fulcrum, mm; E is the elastic modulus of the straightening roller, MPa; I is the moment of inertia of the cylindrical section, N mm; F _i represents the The bending force of the i support roll, N; a _i represents the distance between the i support roll and the left fulcrum at the left end, mm; b _i represents the length of the i support roll body, mm; c _i represents the i The distance between the right end of the support roller and the right fulcrum, mm; l represents the distance between the two fulcrums, mm.

Then the target deflection function of the straightening roller is:

_f (x)= _fj (x)+fw(x) (26)

In the formula, f(x) is the deflection at the distance x from the straightening roller body to the left fulcrum.

(3) It is known that the straightening force received by the straightening roller on a certain steel grade (width 1500mm) is:

Table 2

Straightening roller number 1# 2# 3# 4# 5# 6# 7# sum Straightening force (kN) 206.16 243.37 194.88 145.34 96.85 49.04 9.91 945.55

1#～7# represent the 7 upper rollers of the straightening machine.

Taking the calculation of positive bending force and negative bending force of 1# roller as an example, the key steps are as follows:

a) Set the range of initial positive bending force and negative bending force of 1# roller to 0~206.16kN;

b) Set the hyperparameters of the particle swarm optimization algorithm as follows:

table 3

Population number n_g 40 Self-awareness item learning factor c₁ 1.0 Group cognition item learning factor c₂ 2.0 The maximum variation of the independent variable v_max 10 Initial inertia factor ωⁱⁿⁱ 0.9 Final inertia factor ω^end 0.4 The number of iterations n_iter 20

In the present embodiment, calculate 5 times to 1# roller, record the calculation result of each 1# as follows:

Table 4

It can be seen that with the particle swarm optimization algorithm, the results of each calculation are different. Among them, the roll profile curve of 1# roll is calculated each time as shown in Figure 3-6.

(4) Assume that subsequent calculations are performed according to the calculation results of the fifth time.

The calculation results are shown in Table 5:

table 5

Straightening roller number Positive bending force (kN) Negative Bending Force(kN) Maximum deflection (mm) 1# 118.49 118.36 0.17 2# 213.91 0 0.11 3# 55.85 227.25 0.27 4# 106.68 47.59 0.30 5# 84.85 0 0.06 6# 0 85.9 0.14 7# 0 16.37 0.03 Sum 579.78 495.47 /

Assuming that the average distribution method is used, the positive bending force provided by a single positive bending hydraulic cylinder can be obtained as:

The negative bending force provided by a single negative bending hydraulic cylinder is:

Assuming that the proportional coefficient method is used, the positive bending force provided by a single positive bending hydraulic cylinder on the inlet side can be obtained as:

The positive bending force provided by a single positive bending hydraulic cylinder on the outlet side is:

The negative bending force provided by a single negative bending hydraulic cylinder on the inlet side is:

The negative bending force provided by a single negative bending hydraulic cylinder on the outlet side is:

(5) Assuming that the positive bending correction coefficient is 0.9 and the negative bending correction coefficient is 0.85, the actual total positive bending force is:

F _psa ＝579.78×0.9＝521.8kN (35)

The actual total negative bending force is:

_Fnsa ＝495.47×0.85＝421.15kN (36)

The distribution of the bending force of the hydraulic cylinder also needs to be recalculated.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be carried out Modifications or equivalent replacements, without departing from the spirit and scope of the technical solution, should be included in the scope of the claims of the present invention.

Claims (8)

1. A straightening machine roll bending force setting method based on a particle swarm algorithm is characterized in that: the method comprises the following steps:

s1: according to the equipment structure of the straightening machine, establishing the geometric relationship among the hydraulic cylinder, the straightening roller and the supporting roller;

s2: establishing a function model of the deflection of the straightening roll about the straightening force and the roll bending force;

s3: solving positive bending force and negative bending force when the deflection of the straightening roll is minimum by adopting a particle swarm algorithm;

s4: distributing the positive bending force and the negative bending force to a positive bending hydraulic cylinder and a negative bending hydraulic cylinder;

s5: the positive bending force and the negative bending force are corrected.

2. The straightening machine roll bending force setting method based on the particle swarm optimization according to claim 1, characterized in that: the straightening machine comprises a bending roll box, a plurality of straightening rolls, a hydraulic cylinder and a supporting roll; the supporting rollers are arranged in the bending roller box in groups, the straightening rollers are arranged below the bending roller box, and the supporting rollers are in contact with the straightening rollers and provide bending force; the pneumatic cylinder is located the bending box upper end, the pneumatic cylinder includes positive curved pneumatic cylinder and negative curved pneumatic cylinder, positive curved pneumatic cylinder provides positive bending force for the backing roll, negative curved pneumatic cylinder provides negative bending force for the backing roll.

3. The particle swarm optimization based straightener roll bending force setting method according to claim 2, characterized in that: in the step S1, establishing a geometric relationship among the hydraulic cylinder, the straightening roll, and the support roll includes:

the positive or negative bending force provided by a single support roller is:

in the formula, F _z Positive bending force or negative bending force is provided for a single supporting roller on each straightening roller; f _w The total positive bending force or negative bending force applied to each straightening roll; n is the number of supporting rollers for providing positive bending force or negative bending force on each 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＝F _z ·cosθ (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 =0 degree;

the total positive bending force or negative bending force required by the straightening machine is as follows:

F _sum ＝F _w1 +F _w2 +…+F _wn (3)

in the formula, F _sum The total positive bending force or the total negative bending force required by the straightening machine; f _w1 To F _wn Positive bending force or negative bending force required for the 1 st straightening roll to the nth straightening roll.

4. The particle swarm optimization based straightener roll bending force setting method according to claim 1, characterized in that: s2, the function model of the deflection of the straightening roll about the straightening force and the roller bending force is as follows:

f(x)＝f _j (x)+f _w (x) (4)

in the formula, f (x) is the deflection of a certain point x on the straightening roll body; f. of _j (x) The deflection at a certain point x on the roller body of the straightening roller under the action of straightening force; f. of _w (x) The deflection at a certain point x on the straightening roll body under the action of the roll bending force.

5. The particle swarm optimization based straightener roll bending force setting method according to claim 1, characterized in that: the step S3 specifically includes the following steps:

s31: setting the initial positive and negative bending forces to a range of [0 _ji ]In which F _ji The straightening force of the current straightening roll;

s32: setting hyper-parameters of particle swarm algorithm, including population n _g Self-cognition learning factor c ₁ Group cognition item learning factor c ₂ Maximum amount of change allowed per iteration v _max An inertia factor ω;

s33: initializing a population, substituting the initial positive bending force and the initial negative bending force into an objective function, and calculating an individual optimal value and a population optimal value of the population, wherein the objective function is as follows:

max[φ(F _zi ,F _fi )]＝max[-|f(x)|] (5)

s34: and calculating the independent variable increment in the k iteration, wherein the inertia factor of the k iteration is as follows:

the argument increment of the kth iteration is:

v ^k ＝ω ^k ·v ^k-1 +c ₁ ·R _a ·(p _b -x ^k-1 )+c ₂ ·R _a ·(g _b -x ^k-1 ) (7)

in the formula, ω ^k Is the inertia factor at the kth iteration, ω _ini Is an initial inertia factor, ω _end As a final inertia factor, n _iter For the number of iterations, n is the current number of iterations, n is an element [0, n ] _iter ]，x ^k-1 Is the argument at the k-1 iteration, x ^k ＝x ^k-1 +v ^k ，R _a Is a random number between (0, 1), p _b For individual optimum, g _b The optimal value of the population is obtained;

s35: updating the independent variable and solving a new objective function value;

s36: updating the individual optimal value and the group optimal value of the population;

s37: repeating S34-S36 until the iteration times or the target precision is reached;

s38: repeating S31-S37 until the positive bending force and the negative bending force required by all the upper straightening rollers are calculated;

s39: and calculating the total positive bending force and the total negative bending force, checking whether the total positive bending force and the total negative bending force exceed the limit, resetting the range of the initial positive bending force and the initial negative bending force if the total positive bending force and the negative bending force exceed the limit, and repeating S31 to S38.

6. The straightening machine roll bending force setting method based on the particle swarm optimization according to claim 1, characterized in that: in the step S4, the positive bending force and the negative bending force are distributed to the positive bending hydraulic cylinder and the negative bending hydraulic cylinder by adopting an average distribution method:

in the formula, F _op Force output for each positive or negative bending hydraulic cylinder; f _sb The calculated total positive roll bending force or the calculated total negative roll bending force; n is a radical of hydrogen _op The number of the positive bending hydraulic cylinders or the negative bending hydraulic cylinders.

7. The straightening machine roll bending force setting method based on the particle swarm optimization according to claim 1, characterized in that: in the step S4, the positive bending force and the negative bending force are distributed to the positive bending hydraulic cylinder and the negative bending hydraulic cylinder by adopting a proportional coefficient distribution method:

if m upper straightening rollers are provided, i positive bending hydraulic cylinders are arranged at the strip steel inlet side and mainly act on the front n ₁ An upper straightening roll, j positive bending hydraulic cylinders arranged on the outlet side of the strip steel and mainly acting on the nth ₂ And the last upper straightening roll, the force output by the single positive bending cylinder at the inlet side is as follows:

in the formula, F _op2 Force output for a single positive bending cylinder on the inlet side; f _bp1 To F _bpn1 The positive bending force required from the 1# straightening roll to the n1# straightening roll, F _bpn2 To F _bpm The positive bending force required from the n2# straightening roll to the m # straightening roll is positioned; f _bp Calculating the total positive roll bending force; alpha (alpha) ("alpha") _p The proportional coefficient of the positive roll bending force on the inlet side; i is the number of the inlet side positive bending hydraulic cylinders;

the force output by each negative-bending hydraulic cylinder and the force output by the outlet-side hydraulic cylinder are calculated by equations (9) and (10).

8. The straightening machine roll bending force setting method based on the particle swarm optimization according to claim 1, characterized in that: in the step S5, the correction needs to be carried out 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 beta _p Negative bending correction coefficient digital beta _n The actual required positive bendingThe forces and negative bending forces are:

F _ap ＝F _sz ·β _p (11)

F _an ＝F _sf ·β _n (12)

in the formula, F _ap Actual total positive bending force; f _an Actual total negative bending force; f _sz The calculated total positive bending force; f _sf The calculated total negative bending force; beta is a beta _p Is a positive camber correction factor; beta is a beta _n Is a negative bend correction factor.

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