CN-122021118-A - Finite element analysis method for evaluating structural stability of supporting roller

CN122021118ACN 122021118 ACN122021118 ACN 122021118ACN-122021118-A

Abstract

The invention relates to a finite element analysis method for evaluating the structural stability of a supporting roller, belongs to the technical field of supporting roller structural stability research, and solves the problem that the prior art lacks analysis of the structural stability of the supporting roller. The finite element analysis method comprises the steps of constructing a supporting roller working model, obtaining a circumferential contact stress distribution curve and a shear stress curve of the supporting roller to be evaluated based on simulation calculation of the supporting roller working model, carrying out a stress control low-cycle fatigue test and a strain control low-cycle fatigue test on the supporting roller to be evaluated to obtain a cyclic stress strain curve of the supporting roller to be evaluated, determining Chaboche model parameters of the supporting roller to be evaluated based on the cyclic stress strain curve, and applying Chaboche model parameters, the circumferential contact stress distribution curve and the shear stress curve to the supporting roller working model to carry out stability analysis on the supporting roller to be evaluated. Analysis of structural stability of the support roller is realized.

Inventors

CAO MING
LI LINLIN
LI JIAO
BAI XINGHONG
ZHU YANKUN
ZHANG PENG

Assignees

天津重型装备工程研究有限公司
东北大学

Dates

Publication Date: 20260512
Application Date: 20251225

Claims (10)

1. A finite element analysis method for evaluating stability of a backup roll structure, the finite element analysis method comprising: Constructing a three-dimensional finite element analysis model when the working state of the support roller to be evaluated is established according to the maximum rolling force load to obtain a support roller working model, and obtaining a circumferential contact stress distribution curve and a shear stress curve of the support roller to be evaluated based on simulation calculation of the support roller working model; performing a stress control low-cycle fatigue test and a strain control low-cycle fatigue test on the support roll to be evaluated to obtain a cyclic stress strain curve of the support roll to be evaluated, and determining Chaboche model parameters of the support roll to be evaluated based on the cyclic stress strain curve; And applying Chaboche model parameters, a circumferential contact stress distribution curve and a shear stress curve to a working model of the supporting roller, and analyzing the stability of the supporting roller to be evaluated.
2. The finite element analysis method according to claim 1, wherein the constructing the three-dimensional finite element analysis model for the working state of the backup roll to be evaluated based on the maximum rolling force load to obtain the working model of the backup roll comprises: Constructing a working roll model, a steel plate model and a supporting roll model when the working state of the supporting roll to be evaluated is set; Performing grid division on a working roll model, a steel plate model and a supporting roll model when the working state of the supporting roll is to be evaluated; after grid division, the maximum rolling force is applied to the bearing seat position of the support roller in a rigid motion coupling mode to simulate the working state of the support roller to be evaluated.
3. The finite element analysis method according to claim 2, wherein the construction of the work roll model, the steel plate model, and the support roll model in the operation state of the support roll to be evaluated includes: Drawing respective sectional views of the backup roll, the working roll and the steel plate to be evaluated according to respective engineering views of the backup roll, the working roll and the steel plate to be evaluated; And (3) based on the respective sectional views of the support roller to be evaluated, the working roller and the steel plate, and combining the respective selected symmetry axes to rotate 180 degrees, constructing a working roller model, a steel plate model and a support roller model when the support roller to be evaluated is in the working state.
4. The finite element analysis method according to claim 2, wherein the meshing of the work roll model, the steel sheet model, and the support roll model in the operation state of the support roll to be evaluated includes: Dividing the working roll model, the steel plate model and the supporting roll model according to a first preset length to obtain a divided working roll model, a divided steel plate model and a divided supporting roll model; Determining contact stress corresponding to different contact widths in the segmented working roll model, the steel plate model and the supporting roll model based on the Hertz theory, setting a refined grid according to a second preset length if the contact stress is larger than a preset stress threshold value, otherwise setting a coarse grid according to a third preset length; The third preset length is greater than the first preset length, and the first preset length is greater than the second preset length.
5. The finite element analysis method according to claim 1, wherein the simulation calculation based on the support roller working model obtains a circumferential contact stress distribution curve of the support roller to be evaluated, and the method comprises the following steps: Operating ABAQUS calculation based on a supporting roller working model to obtain a contact stress cloud picture of the supporting roller to be evaluated; extracting stress data of contact stress circumferentially distributed along the surface of the supporting roller from the contact stress cloud chart; fitting the extracted stress data of the contact stress circumferentially distributed along the surface of the support roller with a Hertz theoretical formula to obtain a circumferential contact stress distribution curve of the support roller to be evaluated.
6. The finite element analysis method according to claim 1, wherein when the stress control low cycle fatigue test is performed on the support roll to be evaluated, the maximum rolling force load is 1.05 to 1.1 times the yield stress corresponding to the support roll material to be evaluated; when a strain control low-cycle fatigue test is carried out on the support roller to be evaluated, the strain load is increased by 0.1% by the strain corresponding to the yield stress corresponding to the support roller material to be evaluated; The cycle of the stress control low cycle fatigue test and the strain control low cycle fatigue test was 100 weeks, and the cyclic stress-strain curve of the support roller was measured and evaluated.
7. The finite element analysis method according to claim 6, wherein the control equation of Chaboche model of the backup roll to be evaluated is: Wherein σ y represents the control equation of the Chaboche model, σ 0 represents the initial yield stress, Q, b represents isotropically strengthened material parameters, C, γ represent material parameters related to the follow-up hardening, and ε p represents the equivalent plastic strain.
8. The finite element analysis method of claim 1, wherein applying Chaboche model parameters, hoop contact stress profile, and shear stress profile to the backing roll working model comprises: Constructing a small-size finite element model based on a supporting roller working model; And carrying out cyclic rolling loading of the circumferential contact stress distribution curve and the shearing stress curve for a plurality of times to a small-size finite element model by utilizing Dload, utracload of ABAQUS.
9. The finite element analysis method according to claim 8, wherein the small-sized finite element model uses a plane strain cell, and has a length of 300mm, a width of 160mm, and a minimum cell size of 1 μm.
10. The finite element analysis method according to claim 8, wherein the performing stability analysis of the backup roll to be evaluated includes: Judging whether the support roll to be evaluated yields in the small-size finite element model, if not, loading in one cycle, and if so, loading in a plurality of cycles until the plastic strain is not increased any more, wherein the support roll to be evaluated enters a stable state; The method comprises the steps of determining the position of maximum equivalent stress according to the stress state of the support roll to be evaluated in the stable state, presetting inclusion defects at the position of the maximum equivalent stress, and analyzing the stable response of the support roll to be evaluated when the defects appear at the most dangerous position.

Description

Finite element analysis method for evaluating structural stability of supporting roller Technical Field The invention relates to the technical field of bearing roller structure stability research, in particular to a finite element analysis method for evaluating the structural stability of a bearing roller. Background The supporting roller bears rolling force in the process of rolling the steel plate, suppresses the deflection deformation of the working roller, and ensures the core component of rolling precision, and is widely applied to hot rolling, cold rolling and heavy and medium plate rolling mills. In recent years, the research of the support roller is advancing toward high load bearing, high precision and long life, which puts higher demands on the fatigue performance and wear performance of the support roller. Therefore, according to the high-bearing requirement, the stability of the supporting roller structure in the rolling contact process is studied, and the method has important significance for analyzing the fatigue performance of the supporting roller and selecting materials of the supporting roller. Under the working environment, the main failure modes of the supporting roll are contact fatigue spalling, edge stress concentration cracks, cracking caused by internal defects and the like, and the problems seriously affect the service life of the supporting roll and also cause the reduction of rolling precision. In order to study the failure mechanism of the contact fatigue of the supporting roller structure and improve the service life of the supporting roller structure, an analysis method capable of calculating the material stability response in the rolling contact process of the supporting roller is needed to evaluate the fatigue performance of the supporting roller after stability. Disclosure of Invention In view of the above analysis, the present invention is directed to a finite element analysis method for evaluating the stability of a supporting roller structure, which is used for solving the problem that the prior art lacks analysis of the stability of the supporting roller structure. The embodiment of the invention provides a finite element analysis method for evaluating the structural stability of a supporting roller, which comprises the following steps: Constructing a three-dimensional finite element analysis model when the working state of the support roller to be evaluated is established according to the maximum rolling force load to obtain a support roller working model, and obtaining a circumferential contact stress distribution curve and a shear stress curve of the support roller to be evaluated based on simulation calculation of the support roller working model; performing a stress control low-cycle fatigue test and a strain control low-cycle fatigue test on the support roll to be evaluated to obtain a cyclic stress strain curve of the support roll to be evaluated, and determining Chaboche model parameters of the support roll to be evaluated based on the cyclic stress strain curve; And applying Chaboche model parameters, a circumferential contact stress distribution curve and a shear stress curve to a working model of the supporting roller, and analyzing the stability of the supporting roller to be evaluated. Based on the further improvement of the finite element analysis method, the method for obtaining the working model of the support roller by constructing a three-dimensional finite element analysis model when the working state of the support roller is to be evaluated according to the maximum rolling force load comprises the following steps: Constructing a working roll model, a steel plate model and a supporting roll model when the working state of the supporting roll to be evaluated is set; Performing grid division on a working roll model, a steel plate model and a supporting roll model when the working state of the supporting roll is to be evaluated; after grid division, the maximum rolling force is applied to the bearing seat position of the support roller in a rigid motion coupling mode to simulate the working state of the support roller to be evaluated. Based on the further improvement of the finite element analysis method, the construction of the working roll model, the steel plate model and the supporting roll model when the working state of the supporting roll to be evaluated is carried out comprises the following steps: Drawing respective sectional views of the backup roll, the working roll and the steel plate to be evaluated according to respective engineering views of the backup roll, the working roll and the steel plate to be evaluated; And (3) based on the respective sectional views of the support roller to be evaluated, the working roller and the steel plate, and combining the respective selected symmetry axes to rotate 180 degrees, constructing a working roller model, a steel plate model and a support roller model when the support roller to be evaluated is in the