CN102921741A - Modeling method of finite element model for calculating roll gap crown of special roll shape of rolling mill - Google Patents
Modeling method of finite element model for calculating roll gap crown of special roll shape of rolling mill Download PDFInfo
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- CN102921741A CN102921741A CN201210412103XA CN201210412103A CN102921741A CN 102921741 A CN102921741 A CN 102921741A CN 201210412103X A CN201210412103X A CN 201210412103XA CN 201210412103 A CN201210412103 A CN 201210412103A CN 102921741 A CN102921741 A CN 102921741A
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Abstract
The invention relates to a modeling method of a finite element model for calculating roll gap crown of a special roll shape of a rolling mill. An object is a six-roll cold rolling mill of which a middle roll has a CVC (Continuously Variable Crown) roll shape; the entire model is based on ABAQUS finite element analysis software as a tool; the method comprises the steps of basic modeling, material property assignment, grid cell division, boundary constraint, external load application and corresponding algorithm selection; after the model is established, only conditions such as amplitudes of rolling force and roll bending force and the lateral displacement of the middle roll are required to be input, or the conditions are changed, so that different roll gap transverse distribution can be obtained, and thereby the plate shape and roll gap crown adjustment capacity of the rolling mill can be examined; particularly in plate shape control researches, finite element simulation calculation is required to be combined, the calculation working conditions are more, and the calculation quantity is high; by utilization of the model, the method has the characteristics of easiness and convenience in calculation and high calculation speed; the calculation time is shortened; the risk of error is reduced; and the method has universality and is suitable for most of rolling mills.
Description
Technical field
The present invention relates to a kind of modeling method of the FEM model that calculates for the special roll forming Gap crown of milling train, belong to Computer ancillary technique field, rolling field.
Background technology
The factor that affects Gap crown comprises: the strain of roller system, the hot convexity of roll, the wearing and tearing of roll, the original convexity of roll.Realize the control of roll gap shape, can start with from the roll crown of controlling above four aspects.And in the process that the carrying roll gap forms, the strain of roller system is main, most active factor, become realize Crown control mainly have object in mind.The calculating of roll elastic deformation part is comparatively ripe, and present Computer Precision has reached practical degree.Research roll roll elastic deformation is for designing, transform strip-mill strip and all having very important significance for controlling and improving plate shape.
For control panel shape, exploitation CVC Shape of Strip Rolling Mill Pre-hypothesis control system, just needing to be combined with finite element analysis carries out, the calculating that need to carry out a large amount of operating modes provides data and carries out system verification, up to the present, the finite element software kind is numerous, therefore needing to select wherein a kind of finite element software to set up a kind ofly correctly and simple is used for special roll forming roller system of rolling mill deformation analysis models and carries out Gap crown and calculate fast, and this model is easy to revise, and the Gap crown that also can be applicable to other milling trains calculates.
Summary of the invention
The objective of the invention is to overcome the deficiency that prior art exists, a kind of modeling method of the FEM model that calculates for the special roll forming Gap crown of milling train is provided.
Purpose of the present invention is achieved through the following technical solutions:
The modeling method that is used for the FEM model that the special roll forming Gap crown of milling train calculates, object be intermediate calender rolls with 6 cold mills of CVC roll forming, and use finite element software ABAQUS to carry out modeling, may further comprise the steps:
1) sets up basic model according to the actual parameter of milling train, intermediate calender rolls is with the CVC roll shape curve, based on the symmetry of actual milling train and in order to improve computational speed, model is thought of as 1/4th models, be roller and fasten half of half part, full roller is to be 6 rollers, and the first half is 3 rollers, and roll-force is applied directly on the working roll; Under ABAQUS finite element software platform, according to the milling train size, take roll mandrel to as X-axis, the thickness of strip direction is Y-axis, and rolling direction is that to set up three-dimensional roller be model to Z axis;
2) carry out the material assignment to model, the material characteristic parameter of working roll, intermediate calender rolls and backing roll is very nearly the same, is similar to think identical;
3) give the model partition grid, and choose cell type, the circumferential contact portion of roll participates in calculating, therefore grid is closeer, to guarantee result's accuracy, roll barrel inside does not participate in calculating, therefore grid is comparatively sparse; Grid Align between each roll, the degree of accuracy that improves the result;
4) apply boundary condition, to avoid the voltuntary movement of each several part in the model; Outer carrying is the bending roller force on the roll-force that acts directly on rolled piece width on the working roll and working roll, the intermediate calender rolls two ends axle journal central point;
5) two analysis step are set, first analysis step applies first smaller roll-force, and purpose is to contact between the roll in order to make, and applies simultaneously abundant constraint, avoids the each several part voltuntary movement; Second analysis step is applied with all roll-forces again, makes model reach convergence in computational process;
6) arrange the contact right, using the ABAQUS/Standard solver to submit to calculates, the solution procedure of ABAQUS/Standard solver is to use the answer that the Newton-Raphson algorithm obtains problem, to find the solution that satisfies constraints as the process of the search contact condition of target, iteration step by step, finally find approximate solution, and obtain the distortion of roller system, extract the Gap crown result.
Further, the modeling method of the above-mentioned FEM model that is used for the special roll forming Gap crown calculating of milling train, based on symmetry and the raising computational speed of actual milling train, model is 1/4th models, do not consider band and roller rotational, roll-force is applied directly on the working roll; Each roll is considered chamfering, and intermediate calender rolls is with the CVC roll shape curve, and its model imports by third party's mechanical drawing software and realizes.
Further, the modeling method of the above-mentioned FEM model that is used for the special roll forming Gap crown calculating of milling train, the CVC roll forming is non-linear high order curve, the contact complex contour, two Elastic Contact are to all belonging to the contact of irregular-face; Whether before problem solving, it is unknown contacting between the contact area surface, under the original state when model is set up, does not all contact between intermediate calender rolls and working roll and intermediate calender rolls and the backing roll, respectively stays one section small gap.
Further, the modeling method of the above-mentioned FEM model that is used for the special roll forming Gap crown calculating of milling train, its model boundary condition, the existence of the plane of symmetry of model, the displacement of restricted model Z direction; Apply the constraint of Y-direction at backing roll roll neck two end nodes; Apply the constraint of directions X at working roll, intermediate calender rolls and support body of roll intermediate node, avoid the voltuntary movement of each several part in the model; Outer carrying is the bending roller force on the roll-force that acts directly on rolled piece width on the working roll and working roll, the intermediate calender rolls two ends axle journal central point, set up a reference point in the working roll bottom, and a limit and this reference point of extracting strip width length are coupled, roll-force is applied on the reference point, and then evenly be delivered to the working roll body of roll, change or roll-force changes and all is convenient to revise if plate is wide.
Again further, the modeling method of the above-mentioned FEM model that is used for the special roll forming Gap crown calculating of milling train, model divides two analysis step, first analysis step retrains first the constraint of working roll and intermediate calender rolls roll neck Y-direction, and apply first smaller roll-force, make to contact between the roll, solve intermediate calender rolls and contact unknown problem with all the other rolls, solve simultaneously the voluntomotory problem of model each several part; Second analysis step decontroled the constraint to working roll and intermediate calender rolls roll neck Y-direction again, simultaneously all roll-forces is applied with, and is not disposable roll-force all to be applied on the working roll, makes model reach smoothly convergence in computational process.
The substantive distinguishing features that technical solution of the present invention is outstanding and significant progressive being mainly reflected in:
1. modeling process is simple, and computational speed is fast.Be to study the distortion of roller system because of emphasis of the present invention, and then obtain the size of Gap crown, and consider the symmetry of realistic model, therefore realistic model some simplification have been done, do not consider the rotation of band and roll, so just become the Solve problems of an elastic model, calculate simple a lot, and calculate the fast computational speed of an operating mode, greatly saved the time, for exploitation CVC Shape of Strip Rolling Mill Pre-hypothesis control system, the calculating that need to carry out a large amount of operating modes provides data and carries out system verification and provides great convenience and help;
2. model is easy to revise, has very strong versatility, characteristics according to ABAQUS software self parametric modeling, in case model parameter or size change, or the milling train object of studying is when changing, only need be changed a little model and get final product, and the Gap crown that also can be applicable to most of type milling train calculates;
3. simulation calculation is stable, because having taked to calculate step by step and apply gradually step by step outer method of carrying, so that the model calculation stability, the situation that can not occur not restraining and can not calculate, even if model parameter or size change, also can once calculate smoothly, needn't calculate all at every turn and will debug.The present invention can change the conditions such as roll-force, bending roller force size, the traversing amount of intermediate calender rolls, calculate the Gap crown under the different operating modes, investigate plate shape and the Gap crown regulating power of milling train, exploitation CVC Shape of Strip Rolling Mill Pre-hypothesis control system is had certain directive significance.
Description of drawings
Below in conjunction with accompanying drawing technical solution of the present invention is described further:
Fig. 1: the inventive method flow chart;
Fig. 2: CVC roll forming schematic diagram;
Fig. 3: roller is the boundary condition schematic diagram;
Fig. 4: roll-force applies schematic diagram;
Fig. 5: Contact Algorithm schematic flow sheet;
Fig. 6: bandwidth 2150mm, roll-force 2000t, the Gap crown of the traversing amount of different intermediate calender rolls;
Fig. 7: bandwidth 960mm, roll-force 2000t, the Gap crown of the traversing amount of different intermediate calender rolls.
The specific embodiment
Be the flow process of the inventive method such as Fig. 1, model is by working roll, intermediate calender rolls and backing roll consist of, consider that emphasis of the present invention is to study the distortion of roller system, and then obtain the size of Gap crown, and consider the symmetry of realistic model, and require to obtain fast result of calculation, therefore realistic model some simplification have been done, do not consider the rotation of band and roll, model is thought of as 1/4th models of realistic model, and (roller is fastened half of half part, full roller is to be 6 rollers, the first half is 3 rollers), the model of working roll and backing roll is set up by operations such as circumgyration stretches, and intermediate calender rolls is with the CVC roll shape curve, roll shape curve as shown in Figure 2, by third party's mechanical drawing software I nventor curve plotting and intermediate calender rolls roll body model, and import ABAQUS software and set up its model, in addition, set up chamfering for each roll, the existence of considering chamfering is pressure between pair roller whether, Gap crown has certain influence.
The material of working roll is 9Cr3Mo, and the material of intermediate calender rolls is MC3, and the material of backing roll is 9Cr2Mo, and its characterisitic parameter is very nearly the same, is similar to think identical, and its Elastic Modulus is 220Gpa, and Poisson's ratio is 0.3, and density is 7.9 * 10
3Kgm
-3
Give the model partition grid, and choose cell type, the circumferential contact portion of roll participates in calculating, therefore grid is closeer, to guarantee result's accuracy, roll barrel inside does not participate in calculating, therefore grid is comparatively sparse; Grid Align between each roll, the degree of accuracy that also can improve the result.For the such contact problems of this model, cell type is chosen for single order incompatible mode unit (C3D8I).
The intermediate calender rolls roll forming is non-linear high order curve, and the contact-making surface complex contour is before problem solving, whether be unknown, therefore under original state, during assembling model if contacting between the contact area surface, with working roll and intermediate calender rolls, stay one section small distance between intermediate calender rolls and the backing roll.Then apply boundary condition, the plane of symmetry of model has retrained the displacement of model Z direction; Apply the constraint of Y-direction at backing roll roll neck two end nodes; Apply the constraint of directions X at working roll, intermediate calender rolls and support body of roll intermediate node, to avoid the voltuntary movement of each several part in the model, Fig. 3 is that roller is the boundary condition schematic diagram; Outer carry as the roll-force (by the uniform load consideration) that acts directly on rolled piece width on the working roll and act on bending roller force on working roll, the intermediate calender rolls two ends axle journal central point; Set up a reference point in the working roll bottom, and extract strip width long a limit and this reference point and be coupled, roll-force can be applied on this aspect, and then evenly is delivered to the working roll body of roll, if plate is wide to change or roll-force changes and all is convenient to revise, as shown in Figure 4.
Create two analysis step, first analysis step retrains first the constraint of working roll and intermediate calender rolls roll neck Y-direction, and applies first smaller roll-force, and purpose is to contact between the roll in order to make, and applies simultaneously abundant constraint, avoids the each several part voltuntary movement; Second analysis step decontroled the constraint to working roll and intermediate calender rolls roll neck Y-direction again, simultaneously all roll-forces is applied with.By such method, not disposable roll-force all to be applied on the working roll, can make model in computational process, reach smoothly convergence.
Contact is set right, using the ABAQUS/Standard solver to submit to calculates, it is the process of the search contact condition of target that the solution procedure of ABAQUS/Standard solver is actually to find the solution that satisfies constraints, need step by step iteration, Fig. 5 is the Contact Algorithm flow process of ABAQUS/Standard, sets up based on the Newton-Raphson method described in the summary of the invention of front.ABAQUS/Standard checks the state of all contact interactions when each incremental step begins.Represent in the drawings the contact on the slave node; The distance that the expression slave node is invaded the master control surface.If survey and detect any changes in contact in current iteration in the step, ABAQUS/Standard identifies it and is serious discontinuous iteration.After the 1st iteration, ABAQUS/Standard revises behind the contiguity constraint variation with the reflection contact condition, and attempts to carry out iteration the 2nd time, until finish iteration and do not change contact condition.This iteration becomes equilibrium iteration the 1st time, and carries out normal balance convergence check, if convergence is checked unsuccessfully, then will carry out another time iteration, and the ABAQUS/Standard whole process repeated is until obtain the result of convergence.
Be finite element simulation by carrying out roller, a series of useful results have been obtained, thereby for the CVC rolling-mill middle roller has the roll gap Changing Pattern of carrying etc. and the traversing plate shape of exploitation intermediate calender rolls to preset system to provide help after traversing, for example can obtain the displacement deformation of roller system, and then the extraction Gap crown, below will illustrate.
Wide and certain roll-force is checked its Gap crown size and Changing Pattern to traversing calculating of intermediate calender rolls of CVC roll set in 6-H strip mill model with regard to certain plate.The wide 2150mm of plate, in the situation of roll-force 2000t, (traversing amount is extracted into 150mm from-150mm to the traversing amount of different intermediate calender rolls, once traversing every 60mm) Gap crown as shown in Figure 6, the traversing continually varying Gap crown control effect that really can form of different intermediate calender rolls, when upper intermediate calender rolls is just traversing, ribbon shape is intermediate thin, and both sides are thick, and the band convexity is negative convexity, Gap crown is minimum, when upper intermediate calender rolls was negative traversing, ribbon shape was thick middle, and both sides are thin, the band convexity is positive convexity, and Gap crown is maximum.And the wide 960mm of plate, in the situation of roll-force 2000t, the Gap crown of the traversing amount of different intermediate calender rolls as shown in Figure 7, the traversing adjustable range to convexity of CVC six-high cluster mill intermediate calender rolls is larger, strip width is narrower, and CVC six-high cluster mill intermediate calender rolls is traversing less to the convexity adjustable range; And plate is wide, and the traversing regulating effect to plate shape of intermediate calender rolls is more obvious.
In sum, modeling process of the present invention is simple, and computational speed is fast.Be to study the distortion of roller system because of emphasis of the present invention, and then obtain the size of Gap crown, and consider the symmetry of realistic model, therefore realistic model some simplification have been done, do not consider the rotation of band and roll, so just become the Solve problems of an elastic model, calculate simple a lot, and calculate the fast computational speed of an operating mode, greatly saved the time, for exploitation CVC Shape of Strip Rolling Mill Pre-hypothesis control system, the calculating that need to carry out a large amount of operating modes provides data and carries out system verification and provides great convenience and help.Model is easy to revise, has very strong versatility, characteristics according to ABAQUS software self parametric modeling, in case model parameter or size change, or the milling train object of studying is when changing, only need be changed a little model and get final product, and the Gap crown that also can be applicable to most of type milling train calculates.Simulation calculation is stable, because having taked to calculate step by step and apply gradually step by step outer method of carrying, so that the model calculation stability, the situation that can not occur not restraining and can not calculate, even if model parameter or size change, also can once calculate smoothly, needn't calculate all at every turn and will debug.The present invention can change the conditions such as roll-force, bending roller force size, the traversing amount of intermediate calender rolls, calculate the Gap crown under the different operating modes, investigate plate shape and the Gap crown regulating power of milling train, exploitation CVC Shape of Strip Rolling Mill Pre-hypothesis control system is had certain directive significance.
What need to understand is: the above only is preferred embodiment of the present invention; for those skilled in the art; under the prerequisite that does not break away from the principle of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. be used for the modeling method of the FEM model that the special roll forming Gap crown of milling train calculates, it is characterized in that: object be intermediate calender rolls with 6 cold mills of CVC roll forming, adopt finite element software ABAQUS to carry out modeling, may further comprise the steps:
1) set up basic model according to the actual parameter of milling train, intermediate calender rolls is with the CVC roll shape curve, based on the symmetry of actual milling train, model is 1/4th models, is roller is fastened half part half, and full roller is to be 6 rollers, the first half is 3 rollers, and roll-force is applied directly on the working roll; Under ABAQUS finite element software platform, according to the milling train size, take roll mandrel to as X-axis, the thickness of strip direction is Y-axis, and rolling direction is that to set up three-dimensional roller be model to Z axis;
2) carry out the material assignment to model, the material characteristic parameter of working roll, intermediate calender rolls and backing roll is considered as identical;
3) give the model partition grid, and choose cell type, the circumferential contact portion of roll participates in calculating, and grid is close, and to guarantee result's accuracy, roll barrel inside does not participate in calculating, and grid is sparse; Grid Align between each roll;
4) apply boundary condition, avoid the voltuntary movement of each several part in the model; Outer carrying is the bending roller force on the roll-force that acts directly on rolled piece width on the working roll and working roll, the intermediate calender rolls two ends axle journal central point;
5) two analysis step are set, first analysis step applies first roll-force, makes to contact between the roll, imposes restriction simultaneously, avoids the each several part voltuntary movement; Second analysis step is applied with all roll-forces again, and model is restrained in computational process;
6) arrange the contact right, using the ABAQUS/Standard solver to submit to calculates, the solution procedure of ABAQUS/Standard solver is to use the answer that the Newton-Raphson algorithm obtains problem, finding the solution that satisfies constraints is the process of the search contact condition of target, iteration step by step, finally find approximate solution, and obtain the distortion of roller system, extract the Gap crown result.
2. the modeling method of the FEM model that calculates for the special roll forming Gap crown of milling train according to claim 1, it is characterized in that: based on symmetry and the raising computational speed of actual milling train, model is 1/4th models, and roll-force is applied directly on the working roll; Each roll is considered chamfering, and intermediate calender rolls is with the CVC roll shape curve, and its model imports by third party's mechanical drawing software and realizes.
3. the modeling method of the FEM model that calculates for the special roll forming Gap crown of milling train according to claim 1, it is characterized in that: the CVC roll forming is non-linear high order curve, two Elastic Contact are to all belonging to the contact of irregular-face; Whether before problem solving, it is unknown contacting between the contact area surface, under the original state when model is set up, all respectively leaves the gap between intermediate calender rolls and working roll and intermediate calender rolls and the backing roll.
4. the modeling method of the FEM model that calculates for the special roll forming Gap crown of milling train according to claim 1 is characterized in that: its model boundary condition, the existence of the plane of symmetry of model, the displacement of restricted model Z direction; Apply the constraint of Y-direction at backing roll roll neck two end nodes; Apply the constraint of directions X at working roll, intermediate calender rolls and support body of roll intermediate node, avoid the voltuntary movement of each several part in the model; Outer carrying is the bending roller force on the roll-force that acts directly on rolled piece width on the working roll and working roll, the intermediate calender rolls two ends axle journal central point, set up a reference point in the working roll bottom, and a limit and this reference point of extracting strip width length are coupled, roll-force is applied on the reference point, and then evenly be delivered to the working roll body of roll, change or roll-force changes and all is convenient to revise if plate is wide.
5. the modeling method of the FEM model that calculates for the special roll forming Gap crown of milling train according to claim 1, it is characterized in that: create analysis step: model divides two analysis step, first analysis step retrains first the constraint of working roll and intermediate calender rolls roll neck Y-direction, and apply first little roll-force, make and contact between the roll, solve intermediate calender rolls and contact unknown problem with all the other rolls, solve simultaneously the voluntomotory problem of model each several part; Second analysis step decontroled the constraint to working roll and intermediate calender rolls roll neck Y-direction again, simultaneously all roll-forces is applied with, and makes model reach smoothly convergence in computational process.
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| CN104438492A (en) * | 2014-10-24 | 2015-03-25 | 中铁四局集团钢结构有限公司 | Curve face forming technology for high-intensity thick plate in bridge steel structure construction |
| CN104550229A (en) * | 2015-01-22 | 2015-04-29 | 首钢总公司 | Hot rolling 2250 mm and 1580 mm temper mill process setting conversion method |
| CN105689405A (en) * | 2016-01-28 | 2016-06-22 | 燕山大学 | Intelligent setting method for on-line target strip shape of cold rolling strip |
| CN117787066A (en) * | 2024-02-27 | 2024-03-29 | 东北大学 | Method for predicting roll shape of working roll based on thermal convexity of CVC rolling mill |
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| CN103433295A (en) * | 2013-08-05 | 2013-12-11 | 苏州有色金属研究院有限公司 | Method for controlling convexity of single-rack double-coiler aluminum hot mill |
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| CN104550229A (en) * | 2015-01-22 | 2015-04-29 | 首钢总公司 | Hot rolling 2250 mm and 1580 mm temper mill process setting conversion method |
| CN104550229B (en) * | 2015-01-22 | 2016-06-01 | 首钢总公司 | The conversion method of a kind of hot rolling 2250mm and 1580mm levelling machine technique initialization |
| CN105689405A (en) * | 2016-01-28 | 2016-06-22 | 燕山大学 | Intelligent setting method for on-line target strip shape of cold rolling strip |
| CN117787066A (en) * | 2024-02-27 | 2024-03-29 | 东北大学 | Method for predicting roll shape of working roll based on thermal convexity of CVC rolling mill |
| CN117787066B (en) * | 2024-02-27 | 2024-06-07 | 东北大学 | Method for predicting roll shape of working roll based on thermal convexity of CVC rolling mill |
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Application publication date: 20130213 |