CN-117753785-B - Strength and rigidity assessment method suitable for leveling equipment of leveling unit

Abstract

The invention provides a strength and rigidity evaluation method suitable for leveling equipment of a leveling unit, and relates to the technical field of leveling rolling. The method for evaluating the strength and the rigidity of the flattening equipment suitable for the flattening unit comprises the following steps of collecting related evaluation parameters, defining parameters in the evaluation process, initializing parameters such as adjustment times, optimizing step length and the like, calculating the maximum rolling force P max under the collected parameters, and calculating the rigidity representation value of a transmission shaft Calculating the rigidity characterization value f 1 、f 2 、f 3 of the supporting roller, the middle roller and the working roller, calculating the maximum strength characterization value sigma of the roller, and judging the rigidity of the transmission shaft The transmission shaft strength tau < tau er , the roller rigidity f k ＜f ker , the roller strength sigma < sigma er and the strip width b min ＜b j ＜b max meet the requirements at the same time, and the value b xmin ＝b 1 、b xmax ＝b j‑1 is assigned to the strip limit width. The limit specification of the strip steel which can be processed by the leveling unit is evaluated, so that the damage probability of leveling equipment is reduced, and the field production efficiency is improved.

Inventors

• QIU ZHENBO
• ZHANG YANDONG
• SHI ZHAOJIE

Assignees

• 唐山扬邦钢铁技术研究院有限公司
• 燕山大学

Dates

Publication Date

20260512

Application Date

20220917

Claims (5)

1. 1. A method for evaluating strength and rigidity of leveling equipment suitable for a leveling unit is characterized by comprising the following steps executed by a computer: S1, collecting relevant equipment parameters, leveling parameters and strip parameters in the rolling process of a leveling unit, wherein the relevant equipment parameters, the leveling parameters and the strip parameters comprise the maximum value of the thickness of the strip Minimum strip thickness Minimum strip thickness and width Maximum strip width Elongation percentage Coefficient of friction Diameter of transmission shaft Shear modulus of drive shaft Rotational speed of the drive shaft Maximum transmission power of transmission shaft Modulus of elasticity of roll Distance between centerlines of support roller bearings Distance between center lines of intermediate roller bearings Distance between center lines of working roller bearings Distance from point of action of supporting force of supporting roller to edge of supporting roller Distance from the point of action of the counter force of the intermediate roll to the edge of the intermediate roll Distance from the point of action of the counter force of the work roll to the edge of the work roll Length of body of backup roll Length of intermediate roll Length of roll body of working roll Diameter of the middle of the backup roll Diameter of middle part of intermediate roll Diameter of the middle of the work roll Diameter of edge of support roller Diameter of middle roll edge Diameter of working roll edge Equivalent deformation resistance Allowable representation value of rigidity of transmission shaft Allowable representation value of transmission shaft strength Roll stiffness allowable characterization value ( ) Roll strength allowable characterization value ; S2, defining relevant parameters and intermediate process quantities in the flattening rolling process of a flattening unit, wherein the parameters comprise the width of the strip Thickness of strip Strip width storage value Storage value of strip thickness Maximum rolling force of leveling machine set Rigidity characterization value of transmission shaft Strength characterization value of transmission shaft Characterization value of rigidity of roller ( ) Maximum strength characterization value at roll variable cross section Maximum intensity characterization value at midpoint of roll Maximum roll strength characterization value Maximum width of strip steel allowed to be processed by leveling machine Minimum width of strip steel allowed to be processed by leveling machine Optimizing step length of strip steel thickness Band steel width optimization step length Thickness adjustment coefficient of strip steel Strip width adjustment coefficient Number of strip thickness adjustments Number of strip width adjustments ; S3, initializing the optimization step length of the thickness of the strip steel Band steel width optimization step length Thickness adjustment coefficient of strip steel Strip width adjustment coefficient Number of strip thickness adjustments Number of strip width adjustments ; S4, calculating the thickness of the strip steel during the working of the flattening unit according to the flattening rolling pressure model Width of strip steel Maximum rolling force ; S5, calculating a rigidity representation value of the transmission shaft according to the rigidity and strength model of the transmission shaft Strength characterization value of drive shaft ; S6, calculating a rigidity representation value of the support roller according to a rigidity model of the flattening unit roller Stiffness characterization value of intermediate roll Stiffness characterization value of work roll ; S7, calculating the maximum intensity representation value of the variable cross section of the support roller according to the intensity model of the flattening unit roller Maximum intensity characterization value at midpoint Maximum strength characterization value of roll Wherein: ; S8, respectively determining the rigidity, the strength and the strip width of the transmission shaft and the roller according to the model, entering S9 when one of the rigidity, the strength and the strip width of the transmission shaft and the roller does not meet the requirements, and entering S4 when the rigidity, the strength and the strip width of the transmission shaft and the roller meet the requirements simultaneously; In the step S8, judging whether the rigidity, the strength and the strip width of the transmission shaft and the roller meet requirements respectively according to the model is as follows: ; S9, assigning the limit width of the strip steel which can be processed by the leveling unit under the current strip steel thickness specification ; S10, obtaining the thickness range of the strip steel processed by the leveling machine set, S11 is carried out when the thickness range of the strip steel processed by the leveling machine set is established If not, entering S4; s11, outputting the thickness of the strip material when the leveling machine works Limit width of strip processed at this thickness 。
2. 2. The method for evaluating the strength and the rigidity of a temper mill unit according to claim 1, wherein in S4, the thickness of the strip steel is calculated when the temper mill unit works according to a temper rolling pressure model Width of strip steel Maximum rolling force The formula of (2) is: ; In this formula: an intermediate parameter is calculated for the rolling pressure, To roll the length of the arc of contact between the rolls and the strip in the deformation zone, Take value for influence coefficient of leveling steel grade , Take the value of the working condition influence coefficient 。
3. 3. The method for evaluating the strength and the rigidity of the leveling equipment of the leveling machine set according to claim 1, wherein in S5, the rigidity representation value of the transmission shaft is calculated according to the rigidity and the strength model of the transmission shaft Strength characterization value of drive shaft The calculation formula of (2) is as follows: 。
4. 4. The method for evaluating the strength and the rigidity of the leveling equipment of the leveling machine set according to claim 1, wherein in S6, the rigidity representation value of the supporting roller is calculated according to the rigidity model of the roller of the leveling machine set Stiffness characterization value of intermediate roll Stiffness characterization value of work roll The calculation formula of (2) is as follows: ; In this formula: And (3) with An intermediate parameter calculated for the roll stiffness characterization value.
5. 5. The method for evaluating the strength and the rigidity of a leveling device of a leveling machine set according to claim 1, wherein in S7, a maximum strength representation value at a variable cross section of a support roller is calculated according to a strength model of a roller of the leveling machine set Maximum intensity characterization value at midpoint , And The calculation formula of (2) is as follows: ; In this formula: the center distance of the pressing screw is taken as the center distance of the supporting roller bearing, Take the value of the distance from the counter force to the variable cross section , Take the value of the diameter of the variable section of the edge of the supporting roller 。

Description

Strength and rigidity assessment method suitable for leveling equipment of leveling unit Technical Field The invention belongs to the technical field of temper rolling, and particularly relates to a temper mill unit temper mill equipment strength and rigidity assessment method. Background The leveling machine is arranged at the outlet of the continuous annealing unit and is used for continuously leveling annealed steel coils, and is mainly used for improving the quality of strip steel surface plate shapes and eliminating internal stress generated in the annealing process, and a transmission shaft and a roller of leveling equipment are mainly stressed components under the action of rolling force, so that the transmission shaft and the roller are extremely easily damaged due to overlarge bearing load, the strength of the transmission shaft, namely the capability of bearing shear stress, the rigidity of the transmission shaft, namely the capability of bearing torsion angle, the strength of the roller, namely the capability of bearing bending moment of a dangerous section of the roller, and the rigidity of the roller, namely the capability of bearing deflection of the roller. When the leveling machine set processes the plate strip, the transmission shaft receives torsional force and shear stress, the larger the rolling force is, the larger the shear stress and torsional force received by the transmission shaft are, the transmission shaft can be damaged or broken due to the larger torsional force and shear stress under the condition of large rolling force, so that the plate strip and the roller are damaged, the field production efficiency is greatly reduced, in addition, the roller of the leveling machine set receives shear stress and bending moment under the action of large rolling force, the larger the rolling force is, the larger the shearing force and bending moment are, the roller can generate deflection so that the roller gap is not parallel and the thickness distribution of the plate strip is influenced, wave defects and longitudinal thickness differences are caused to the plate strip, so that the evaluation of the limit specification of the strip steel which can be processed by the leveling machine set becomes the key point of the current research under the condition that the allowable rigidity and allowable strength of the roller and the transmission shaft are known, and the evaluation content of the roller and the transmission shaft of the leveling machine set is less studied according to the content searched by literature, the research on the rigidity and the evaluation method of the rigidity and the strength of the leveling machine set is mainly studied on the rigidity and the quality of the leveling machine set and the lack of the quality of the leveling machine set, and the method is suitable for evaluating the quality of the leveling machine set. Disclosure of Invention Aiming at the defects of the prior art, the invention provides an evaluation method suitable for the strength and the rigidity of the leveling equipment of the continuous annealing unit, which comprehensively considers the rolling characteristics of the leveling unit and the structural characteristics of the leveling equipment, establishes a rigidity and strength evaluation model of a transmission shaft and a roller through the research of the shear stress and the torsion force of the transmission shaft and the shear stress and the bending stress of the roller, evaluates the limit specification of strip steel which can be processed by the leveling unit, and reduces the damage probability of the leveling equipment. The invention is realized by the following technical scheme that the method for evaluating the strength and the rigidity of the leveling equipment suitable for the leveling machine set comprises the following steps executed by a computer: S1, collecting relevant equipment parameters in the rolling process of a flattening unit, Flattening parameters and strip parameters, including: a maximum strip thickness h max, a minimum strip thickness h min, a minimum strip width b min, a maximum strip width b max, an elongation epsilon, a friction coefficient mu, a drive shaft diameter D, a shear modulus G of the drive shaft, a rotational speed N of the drive shaft, a maximum transmission power N max of the drive shaft, an elastic modulus E of the roll, a distance a 1 between center lines of the backup roll bearings, a distance a 2 between center lines of the intermediate roll bearings, a distance a 3 between center lines of the work roll bearings, a distance c 1 from a point of application of a backup reaction force of the backup roll to a roll edge of the backup roll, distance c 2 from the point of action of the counter force of the intermediate roll to the edge of the intermediate roll, distance c 3 from the point of action of the counter force of the working roll to the edge of the working roll, length L 1 of the body of the su