A method for evaluating the strength and rigidity of a skin pass mill skin pass device

Abstract

The application provides a kind of suitable for the strength and rigidity evaluation method of temper mill group tempering equipment, and relates to the technical field of temper rolling.The suitable for the strength and rigidity evaluation method of temper mill group tempering equipment, including the following steps executed by computer: collecting relevant evaluation parameters;Define the parameters in the evaluation process;Initialize the number of adjustments and optimization step length parameters;Calculate the maximum rolling force P max under the collected parameters;Calculate the rigidity characteristic value and strength characteristic value τ of the transmission shaft;Calculate the rigidity characteristic values f1, f2 and f3 of the supporting roller, intermediate roller and working roller;Calculate the maximum strength characteristic value σ of the roller;Judge whether the transmission shaft rigidity transmission shaft strength τ < τ er , roller rigidity f k < f ker , roller strength σ < σ er and strip width b min < b j < b max meet the requirements at the same time;Assign b xmin = b1, b xmax = b j‑1 to the limit width of strip. Through the evaluation of the limit specification of the strip that can be processed by the temper mill group, the probability of damage to the tempering equipment is reduced, and the on-site production efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of leveling and rolling technology, and specifically relates to a method for evaluating the strength and stiffness of leveling equipment in leveling units. Background Technology

[0002] The leveling machine is installed at the outlet of the continuous annealing unit and is used to continuously level annealed steel coils. It is mainly used to improve the surface shape quality of strip steel and eliminate internal stress generated during annealing. Under the action of rolling force, the drive shaft and rolls of the leveling equipment are the main load-bearing components, so they are very easy to be damaged due to excessive load. The load-bearing capacity of the drive shaft and rolls can be expressed by strength and stiffness. The strength of the drive shaft is the ability to withstand shear stress, and the stiffness of the drive shaft is the ability to withstand torsional angle. The strength of the roll is the ability of the critical section of the roll to withstand bending moment, and the stiffness of the roll is the ability of the roll to withstand deflection.

[0003] During the processing of strip on the leveling unit, the drive shaft is subjected to torsional force and shear stress. The greater the rolling force, the greater the shear stress and torsional force on the drive shaft. Under high rolling force, the drive shaft may be damaged or broken due to the large torsional force and shear stress, thus damaging the strip and rolls, greatly reducing on-site production efficiency. In addition, under the action of high rolling force, the rolls of the leveling unit are subjected to shear stress and bending moment. The greater the rolling force, the greater the shear force and bending moment on the rolls. As a result, the rolls will deflect, causing the roll gap to become non-parallel, which in turn affects the thickness distribution of the strip, resulting in... The presence of wavy defects and longitudinal thickness variations makes it crucial to assess the maximum strip specifications that a leveling mill can process, given the allowable stiffness and strength of the rolls and drive shafts. Current research focuses on evaluating these limits. Literature reviews reveal limited research on the assessment of the stiffness and strength of leveling mill rolls and drive shafts. Studies primarily focus on methods for evaluating the stiffness and strength of various structural components, particularly regarding the strip shape quality and roll wear of the leveling mill itself. A suitable method for assessing the strength and stiffness of leveling equipment within a leveling mill is lacking. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a method for evaluating the strength and rigidity of leveling equipment in continuous annealing mills. Taking into account the rolling characteristics of the leveling mill and the structural features of the leveling equipment, a rigidity and strength evaluation model for the drive shaft and rolls is established through the study of shear stress and torsional force of the drive shaft, and shear stress and bending stress of the rolls. Furthermore, the limit specifications of strip steel that the leveling mill can process are evaluated, thereby reducing the probability of damage to the leveling equipment.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for evaluating the strength and stiffness of leveling equipment in a leveling unit, comprising the following steps executed by a computer:

[0006] S1. Collect relevant equipment parameters, leveling parameters, and strip parameters during the rolling process of the leveling mill, including: the maximum strip thickness h. max Minimum strip thickness h min Minimum strip width b min Maximum strip width b max Elongation ε, coefficient of friction μ, drive shaft diameter d, shear modulus G of drive shaft, rotational speed n of drive shaft, maximum power transmitted by drive shaft N max The elastic modulus E of the rolls; the distance a1 between the center lines of the support roll bearings; the distance a2 between the center lines of the intermediate roll bearings; the distance a3 between the center lines of the work roll bearings; the distance c1 from the point of application of the support reaction force of the support roll to the edge of the support roll; the distance c2 from the point of application of the support reaction force of the intermediate roll to the edge of the intermediate roll; the distance c3 from the point of application of the support reaction force of the work roll to the edge of the work roll; the roll body length L1 of the support roll; the roll body length L2 of the intermediate roll; the roll body length L3 of the work roll; the diameter D1 of the middle of the support roll; the diameter D2 of the middle of the intermediate roll; the diameter D3 of the middle of the work roll; the diameter d of the edge of the support roll. b1 The diameter d of the middle roller edge b2 The working roller edge diameter d b3 Equivalent deformation resistance σ p Allowable characterization value of drive shaft stiffness Allowable strength rating τ of drive shaft er Allowable characterization value f of roll stiffness ker (k=1, 2, 3), allowable characterization value of roll strength σ er ;

[0007] S2. Define the relevant parameters and intermediate quantities in the leveling and rolling process of the leveling mill, including: strip width b, strip thickness h, and stored value of strip width b. j Strip thickness storage value h i The maximum rolling force P of the leveling unit max stiffness characterization value of the drive shaft The strength characterization value τ of the drive shaft, and the stiffness characterization value f of the roll. k (k=1, 2, 3), the maximum strength characteristic value σ at the variable cross-section of the roll. 1max The maximum strength characteristic value σ at the midpoint of the roll. 2max The maximum strength characteristic value of the roll σ, and the maximum strip width b that the leveling machine can process. xmax The minimum strip width b that the leveling machine is allowed to process xmin, strip thickness optimization step size Δh, strip width optimization step size Δb, strip thickness adjustment coefficient λ, strip width adjustment coefficient β, strip thickness adjustment times i, strip width adjustment times j;

[0008] S3. Initialize strip thickness optimization step size Δh, strip width optimization step size Δb, strip thickness adjustment coefficient λ, strip width adjustment coefficient β, strip thickness adjustment times i, strip width adjustment times j;

[0009] S4. Calculate the strip thickness h, strip width b, and maximum rolling force P of the leveling mill unit during operation based on the leveling rolling pressure model. max ;

[0010] S5. Calculate the stiffness characterization value of the drive shaft based on the drive shaft stiffness and strength model. And the strength characterization value τ of the drive shaft;

[0011] S6. Calculate the stiffness characterization value f1 of the support roll, the stiffness characterization value f2 of the intermediate roll, and the stiffness characterization value f3 of the work roll based on the stiffness model of the leveling mill roll.

[0012] S7. Calculate the maximum strength characteristic value σ at the variable cross-section of the support roll based on the strength model of the leveling mill rolls. 1max The maximum intensity value σ at the midpoint 2max And the maximum strength characterization value σ of the roll;

[0013] S8. Determine the stiffness, strength, and strip width of the drive shaft and rolls respectively according to the model. If any one of them does not meet the requirements, proceed to S9.

[0014] S9. Assign a value b to the maximum strip width that the leveling unit can process under the current strip thickness specifications. xmin =b1, b xmax =b j-1 ;

[0015] S10. Obtain the range of strip thickness processed by the leveling unit, h i ≥h max Upon its establishment, it entered S11;

[0016] S11. The thickness h of the strip when the output leveling machine is working. i And the maximum strip width b processed at this thickness xmin b xmax .

[0017] Preferably, in step S4, the strip thickness h, strip width b, and maximum rolling force P during the operation of the leveling mill are calculated based on the leveling rolling pressure model. max The formula is:

[0018]

[0019] In this formula: F is an intermediate parameter for calculating rolling pressure, L jc ξ0 is the contact arc length between the roll and the strip in the rolling deformation zone, ξ0 is the influence coefficient of the leveling steel grade with a value of -5.2, and ξ1 is the influence coefficient of the working condition with a value of -1.91.

[0020] Preferably, in step S5, the stiffness characterization value of the transmission shaft is calculated based on the transmission shaft stiffness and strength model. The formula for calculating the strength characterization value τ of the drive shaft is as follows:

[0021]

[0022] Preferably, in step S6, the formulas for calculating the stiffness characterization values ​​f1 of the support roll, f2 of the intermediate roll, and f3 of the work roll based on the stiffness model of the leveling mill rolls are as follows:

[0023]

[0024] In this formula: f 1k with f 2k These are intermediate parameters used to calculate the roll stiffness characterization values.

[0025] Preferably, in step S7, the maximum strength characteristic value σ at the variable cross-section of the support roll is calculated based on the strength model of the leveling mill rolls. 1max The maximum intensity value σ at the midpoint 2max The formula for calculating the maximum strength characteristic value σ of the roll is as follows:

[0026]

[0027] In this formula: l0 is the center distance of the pressing screw, which is taken as the center distance of the support roller bearing; c is the distance from the support reaction force to the variable cross section, which is taken as c = 335mm; d j The diameter d at the variable cross-section of the support roller edge is taken as follows. j =550mm.

[0028] 6. Preferably, in step S8, the formula for determining whether the stiffness, strength, and strip width of the drive shaft and the rolls simultaneously meet the requirements based on the model is as follows:

[0029]

[0030] Preferably, in step S8, the process proceeds to step S4 when the stiffness, strength, and strip width of the drive shaft and the rolls simultaneously meet the requirements.

[0031] Preferably, in S10, the strip thickness range h processed by the leveling unit is...i ≥h max If the condition is not met, proceed to S4.

[0032] This invention provides a method suitable for evaluating the strength and stiffness of leveling equipment in leveling units. It has the following beneficial effects:

[0033] 1. This invention establishes a stiffness and strength evaluation model for the drive shaft and rolls by studying the shear stress and torsional force of the drive shaft and the shear stress and bending stress of the rolls. The model can be used to evaluate the limit specifications of strip steel that the leveling unit can process, reduce the probability of damage to the leveling equipment, and improve on-site production efficiency.

[0034] 2. This invention establishes a stiffness and strength evaluation model for the transmission shaft and the roll by studying the shear stress and torsional force of the transmission shaft and the shear stress and bending stress of the roll. Based on this, the limit specifications of strip steel that the leveling unit can process are evaluated, the range of strip steel specifications that the leveling unit can process is determined, the damage frequency of the leveling equipment is reduced, and the production efficiency of the leveling unit is improved. Attached Figure Description

[0035] Figure 1 This is a flowchart of a method for evaluating the strength and stiffness of leveling equipment in a continuous annealing unit, according to the present invention.

[0036] Figure 2 This is a schematic diagram of the 980DP strip's maximum width range according to the present invention;

[0037] Figure 3 This is a schematic diagram of the 780Y strip steel limit width range of the present invention. Detailed Implementation

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0039] Example 1:

[0040] In this embodiment, high-strength steel 980DP is selected as an example for illustration. The thickness of the strip ranges from 0.3mm to 3mm, and the width ranges from 800mm to 1700mm.

[0041] S1: Collect relevant equipment parameters, leveling parameters, and strip parameters during the rolling process of the leveling mill, including the maximum strip thickness h. max =3mm, minimum strip thickness h min =0.3mm, minimum strip width bmin =800mm, maximum strip width b max =1700mm, elongation ε=0.015, coefficient of friction μ=0.15, drive shaft diameter d=450mm, drive shaft shear modulus G=80GPa, drive shaft speed n=200r / min, maximum power transmitted by the drive shaft N max =1500kW, elastic modulus of the roll E = 2.1 × 10 5 MPa, the distance between the center lines of the support roller bearings a1 = 2780 mm, the distance between the center lines of the intermediate roller bearings a2 = 2600 mm, the distance between the center lines of the work roller bearings a3 = 2600 mm, the distance from the point of application of the support reaction force of the support roller to the edge of the support roller c1 = 525 mm, the distance from the point of application of the support reaction force of the intermediate roller to the edge of the intermediate roller c2 = 335 mm, the distance from the point of application of the support reaction force of the work roller to the edge of the work roller c3 = 435 mm, the length of the support roller body L1 = 1730 mm, the length of the intermediate roller body L2 = 1930 mm, the length of the work roller body L3 = 1730 mm, the diameter of the middle part of the support roller D1 = 1150 mm, the diameter of the middle part of the intermediate roller D2 = 700 mm, the diameter of the middle part of the work roller D3 = 620 mm, the diameter of the edge of the support roller d b1 =1000mm, diameter d of the middle roller edge b2 =620mm, work roll edge diameter d b3 =570mm, equivalent deformation resistance σ of the strip steel p =783.7MPa, allowable stiffness value of the drive shaft Allowable strength rating τ of drive shaft er =40MPa, allowable characterization value of roll stiffness f ker =2mm (k=1, 2, 3), allowable strength characterization value σ of the roll er =140MPa.

[0042] S2: Defines relevant parameters and intermediate quantities in the leveling and rolling process of the leveling mill, mainly including strip width b, strip thickness h, and stored strip width value b. j Strip thickness storage value h i The maximum rolling force P of the leveling unit max stiffness characterization value of the drive shaft The strength characterization value τ of the drive shaft, and the stiffness characterization value f of the roll. k (k=1, 2, 3), the maximum strength characteristic value σ at the variable cross-section of the roll. 1max The maximum strength characteristic value σ at the midpoint of the roll. 2max The maximum strength characteristic value of the roll σ, and the maximum strip width b that the leveling machine can process. xmax The minimum strip width b that the leveling machine is allowed to process xminThe optimization step size for strip thickness is Δh, the optimization step size for strip width is Δb, the adjustment coefficient for strip thickness is λ, the adjustment coefficient for strip width is β, the number of times strip thickness is adjusted is i, and the number of times strip width is adjusted is j.

[0043] S3: Initialize strip thickness optimization step size Δh = 0.3mm, strip width optimization step size Δb = 100mm, strip thickness adjustment coefficient λ = 0, strip width adjustment coefficient β = 0, strip thickness adjustment times i = 1, strip width adjustment times j = 1.

[0044] S4: Based on the leveling rolling pressure model, calculate the maximum rolling force P of the strip with a thickness h = 3mm and a strip width b = 1200mm during the operation of the leveling mill. max = 941.39t;

[0045]

[0046] S5: Calculate the stiffness characterization value of the drive shaft based on the drive shaft stiffness and strength model. And the strength characterization value of the drive shaft τ = 4 MPa;

[0047]

[0048] S6: Calculate the stiffness characteristics of the support roll, intermediate roll, and work roll based on the stiffness model of the leveling mill rolls:

[0049] (1) The stiffness characterization value of the support roller, f1, is calculated to be 0.33 mm according to the model;

[0050]

[0051] (2) The stiffness characterization value of the intermediate roller, f2, is calculated to be 1.44 mm based on the model;

[0052]

[0053] (3) The stiffness characterization value of the support roller, f3, is calculated to be 2.07 mm based on the model;

[0054]

[0055] S7: Calculate the maximum strength characteristic value σ at the variable cross-section of the support roll based on the strength model of the leveling mill rolls. 1max =19.7MPa, the maximum strength characteristic value σ at the midpoint of the support roller 1max =35.93MPa, then the maximum characteristic value of the rolling mill roll strength σ = 35.93MPa;

[0056]

[0057] S8: Determine whether the stiffness, strength, and strip width of the drive shaft and rolls simultaneously meet the requirements based on the model;

[0058]

[0059] (1) After judging the stiffness of the transmission shaft The requirements are met;

[0060] (2) After determining that the strength of the transmission shaft τ < τ er The requirements are met;

[0061] (3) After judging the roll stiffness f k <f ker Requirements not met;

[0062] (4) After judging the roll strength σ < σ er The requirements are met;

[0063] (5) After determining the strip width b min <b j <b max The requirements are met.

[0064] If it is determined that the rigidity, strength, and strip width of the drive shaft and rolls cannot simultaneously meet the requirements, then proceed to S9.

[0065] S9: Assign a value b to the maximum strip width that the leveling unit can process under the current strip thickness specifications. xmin =800mm, b xmax =1100mm.

[0066] S10: Evaluation range h of strip thickness processed by the leveling unit. i ≥h max If established, it will proceed to S11.

[0067] S11: Output strip thickness h during the operation of the output leveling machine i And the maximum strip width b processed at this thickness xmin b xmax like Figure 2 As shown.

[0068] This embodiment evaluates the maximum strip specifications that the leveling unit can process by using roll stiffness and strength evaluation models and drive shaft stiffness and strength evaluation models. It determines the maximum specifications of high-strength steel 980DP that the leveling unit can process, reduces the probability of damage to the leveling equipment, and improves on-site production efficiency.

[0069] Example 2:

[0070] In this embodiment, high-strength steel 780Y is selected as an example for illustration. The thickness of the strip ranges from 0.3mm to 3mm, and the width ranges from 800mm to 1700mm.

[0071] S1: Collect relevant equipment parameters, leveling parameters, and strip parameters during the rolling process of the leveling mill, including: maximum strip thickness h. max =3mm, minimum strip thickness h min =0.3mm, minimum strip width b min =800mm, maximum strip width b max =1700mm, elongation ε=0.015, coefficient of friction μ=0.15, drive shaft diameter d=450mm, drive shaft shear modulus G=80GPa, drive shaft speed n=200r / min, maximum power transmitted by the drive shaft N max =1500kW, elastic modulus of the roll E = 2.1 × 10 5 MPa, the distance between the center lines of the support roller bearings a1 = 2780 mm, the distance between the center lines of the intermediate roller bearings a2 = 2600 mm, the distance between the center lines of the work roller bearings a3 = 2600 mm, the distance from the point of application of the support reaction force of the support roller to the edge of the support roller c1 = 525 mm, the distance from the point of application of the support reaction force of the intermediate roller to the edge of the intermediate roller c2 = 335 mm, the distance from the point of application of the support reaction force of the work roller to the edge of the work roller c3 = 435 mm, the length of the support roller body L1 = 1730 mm, the length of the intermediate roller body L2 = 1930 mm, the length of the work roller body L3 = 1730 mm, the diameter of the middle part of the support roller D1 = 1150 mm, the diameter of the middle part of the intermediate roller D2 = 700 mm, the diameter of the middle part of the work roller D3 = 620 mm, the diameter of the edge of the support roller d b1 =1000mm, diameter d of the middle roller edge b2 =620mm, work roll edge diameter d b3 =570mm, equivalent deformation resistance σ of the strip steel p =572.5MPa, allowable stiffness value of the drive shaft Allowable strength rating τ of drive shaft er =40MPa, allowable characterization value of roll stiffness f ker =2mm (k=1, 2, 3), allowable strength characterization value σ of the roll er =140MPa.

[0072] S2: Defines relevant parameters and intermediate quantities in the leveling and rolling process of the leveling mill, mainly including strip width b, strip thickness h, and stored strip width value b. j Strip thickness storage value h i The maximum rolling force P of the leveling unit maxstiffness characterization value of the drive shaft The strength characterization value τ of the drive shaft, and the stiffness characterization value f of the roll. k (k=1, 2, 3), the maximum strength characteristic value σ at the variable cross-section of the roll. 1max The maximum strength characteristic value σ at the midpoint of the roll. 2max The maximum strength characteristic value of the roll σ, and the maximum strip width b that the leveling machine can process. xmax The minimum strip width b that the leveling machine is allowed to process xmin The optimization step size for strip thickness is Δh, the optimization step size for strip width is Δb, the adjustment coefficient for strip thickness is λ, the adjustment coefficient for strip width is β, the number of times strip thickness is adjusted is i, and the number of times strip width is adjusted is j.

[0073] S3: Initialize strip thickness optimization step size Δh = 0.3mm, strip width optimization step size Δb = 100mm, strip thickness adjustment coefficient λ = 0, strip width adjustment coefficient β = 0, strip thickness adjustment times i = 1, strip width adjustment times j = 1.

[0074] S4: Based on the leveling rolling pressure model, calculate the maximum rolling force P of the strip with a thickness h = 3mm and a strip width b = 1600mm during the operation of the leveling mill. max =917t;

[0075]

[0076] S5: Calculate the stiffness characterization value of the drive shaft based on the drive shaft stiffness and strength model. And the strength characterization value of the drive shaft τ = 4 MPa;

[0077]

[0078] S6: Calculate the stiffness characteristics of the support roll, intermediate roll, and work roll based on the stiffness model of the leveling mill rolls:

[0079] (1) The stiffness characterization value of the support roller, f1, is calculated to be 0.32 mm according to the model;

[0080]

[0081] (2) The stiffness characterization value of the intermediate roller, f2, is calculated to be 1.4 mm based on the model;

[0082]

[0083] (3) The stiffness characterization value of the support roller, f3, is calculated to be 2.01 mm based on the model;

[0084]

[0085] S7: Calculate the maximum strength characteristic value σ at the variable cross-section of the support roll based on the strength model of the leveling mill rolls. 1max =19.28MPa, the maximum strength characteristic value σ at the midpoint of the support roller 1max =35.16MPa, then the maximum characteristic value of the rolling mill roll strength σ = 35.16MPa.

[0086]

[0087] S8: Determine whether the stiffness, strength, and strip width of the drive shaft and rolls simultaneously meet the requirements based on the model:

[0088]

[0089] (1) After judging the stiffness of the transmission shaft The requirements are met;

[0090] (2) After determining that the strength of the transmission shaft τ < τ er The requirements are met;

[0091] (3) After judging the roll stiffness f k <f ker Requirements not met;

[0092] (4) After judging the roll strength σ < σ er The requirements are met;

[0093] (5) After determining the strip width b min <b j <b max The requirements are met.

[0094] If it is determined that the rigidity, strength, and strip width of the drive shaft and rolls cannot simultaneously meet the requirements, then proceed to S9.

[0095] S9: Assign a value b to the maximum strip width that the leveling unit can process under the current strip thickness specifications. xmin =800mm, b xmax =1500mm.

[0096] S10: Evaluation range h of strip thickness processed by the leveling unit. i ≥h max If established, it will proceed to S11.

[0097] S11: The thickness h of the strip when the output leveling machine is working. i And the maximum strip width b processed at this thickness xmin b xmax like Figure 3 As shown.

[0098] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for evaluating the strength and stiffness of leveling equipment in a leveling unit, characterized in that: This includes the following steps performed by a computer: S1. Collect relevant equipment parameters, leveling parameters, and strip parameters during the rolling process of the leveling mill, including: maximum strip thickness. Minimum strip thickness Minimum strip thickness and width Maximum strip width elongation coefficient of friction drive shaft diameter shear modulus of the drive shaft The rotational speed of the drive shaft Maximum power transmitted by the drive shaft The elastic modulus of the roll The distance between the center lines of the support roller bearings The distance between the center lines of the intermediate roller bearings The distance between the center lines of the work roll bearings The distance from the point of application of the support reaction force of the support roller to the edge of the support roller. The distance from the point of application of the support reaction force of the intermediate roll to the edge of the intermediate roll. The distance from the point of application of the support reaction force of the work roll to the edge of the work roll. The length of the support roller body The length of the intermediate roller body The length of the working roll body The diameter of the middle part of the support roller The diameter of the middle part of the intermediate roller The diameter of the middle part of the work roll Support roller edge diameter The diameter of the middle roller edge working roll edge diameter Equivalent deformation resistance Allowable characterization value of drive shaft stiffness Permissible strength rating of drive shaft Allowable characterization value of roll stiffness ( Allowable characterization value of roll strength ; S2. Define the relevant parameters and intermediate quantities in the leveling and rolling process of the leveling mill, including: strip width. strip thickness Strip width storage value Strip thickness storage value Maximum rolling force of leveling unit stiffness characterization value of the drive shaft Strength characterization value of drive shaft Stiffness characterization value of rolls ( ), the maximum strength characterization value at the variable cross-section of the roll. The maximum strength characterization value at the midpoint of the roll Maximum strength characterization value of rolls The maximum width of strip steel that the leveling machine is allowed to process The minimum width of strip steel that the leveling machine is allowed to process Strip thickness optimization step size Strip width optimization step size Strip thickness adjustment coefficient Strip width adjustment coefficient Number of times the strip thickness is adjusted Number of times the strip width is adjusted ; S3. Initialize strip thickness and optimize step size Strip width optimization step size Strip thickness adjustment coefficient Strip width adjustment coefficient Number of times the strip thickness is adjusted Number of times the strip width is adjusted ; S4. Calculate the strip thickness during the operation of the leveling mill based on the leveling rolling pressure model. strip width and maximum rolling force ; S5. Calculate the stiffness characterization value of the drive shaft based on the drive shaft stiffness and strength model. and the strength characterization value of the drive shaft ; S6. Calculate the stiffness characterization value of the support rolls based on the stiffness model of the leveling mill rolls. Stiffness characterization value of intermediate roller Stiffness characterization value of the work roll ; S7. Calculate the maximum strength characterization value at the variable cross-section of the support roll based on the strength model of the leveling mill rolls. The maximum intensity value at the midpoint and the maximum strength characterization value of the rolls ,in: ； S8. Determine the stiffness, strength, and strip width of the drive shaft and rolls respectively according to the model. If any one of them does not meet the requirements, proceed to S9. If the stiffness, strength, and strip width of the drive shaft and rolls meet the requirements at the same time, proceed to S4. In step S8, the formula for determining whether the stiffness, strength, and strip width of the drive shaft and rolls simultaneously meet the requirements, based on the model, is as follows: ； S9. Assign a value to the maximum strip width that the leveling unit can process under the current strip thickness specifications. ; S10. Obtain the range of strip thickness processed by the leveling unit. When it was established, it entered S11, and the strip thickness range processed by the leveling unit was... If the condition is not met, proceed to S4; S11. Thickness of strip during output leveling machine operation and the maximum strip width processed at this thickness. .

2. The method for evaluating the strength and stiffness of leveling equipment in a leveling unit according to claim 1, characterized in that: In step S4, the strip thickness during the operation of the leveling mill is calculated based on the leveling rolling pressure model. strip width and maximum rolling force The formula is: ； In this formula: Intermediate parameters are calculated for rolling pressure. This refers to the contact arc length between the roll and the strip in the rolling deformation zone. The value of the influence coefficient for leveling steel grades , The value of the working condition influence coefficient .

3. The method for evaluating the strength and stiffness of leveling equipment in a leveling unit according to claim 1, characterized in that: In step S5, the stiffness characterization value of the transmission shaft is calculated based on the transmission shaft stiffness and strength model. and the strength characterization value of the drive shaft The calculation formula is: 。 4. The method for evaluating the strength and stiffness of leveling equipment in a leveling unit according to claim 1, characterized in that: In step S6, the stiffness characterization value of the support roll is calculated based on the stiffness model of the leveling mill roll. Stiffness characterization value of intermediate roller Stiffness characterization value of the work roll The calculation formula is: ； In this formula: and These are intermediate parameters used to calculate the roll stiffness characterization values.

5. The method for evaluating the strength and stiffness of leveling equipment in a leveling unit according to claim 1, characterized in that: In step S7, the maximum strength characterization value at the variable cross-section of the support roll is calculated based on the strength model of the leveling mill rolls. The maximum intensity value at the midpoint , and The calculation formula is: ； In this formula: The center distance of the pressing screw is taken as the center distance of the support roller bearing. The value of the distance from the support reaction to the variable cross section. , The diameter value at the variable cross-section of the support roller edge is selected. .

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