EP4217130A1 - Procédé de modélisation de comportement d'un laminoir circulaire - Google Patents
Procédé de modélisation de comportement d'un laminoir circulaireInfo
- Publication number
- EP4217130A1 EP4217130A1 EP21790945.6A EP21790945A EP4217130A1 EP 4217130 A1 EP4217130 A1 EP 4217130A1 EP 21790945 A EP21790945 A EP 21790945A EP 4217130 A1 EP4217130 A1 EP 4217130A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- parameters
- mandrel
- rolling mill
- force
- setpoint
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H1/00—Making articles shaped as bodies of revolution
- B21H1/06—Making articles shaped as bodies of revolution rings of restricted axial length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
Definitions
- TITLE Process for modeling the behavior of a circular rolling mill
- the present invention relates to the field of modeling forging processes, and in particular the modeling of circular rolling processes.
- a range of forging is the set of shaping operations allowing, using specific tools, to evolve a piece until obtaining, without defect, a raw part of the desired shape.
- a reliable and realistic modeling of all of these operations, and in particular of the behavior of the tools and the billet, makes it possible to reduce the design time of a new range of forges, since this also makes it possible to reduce the number of parts. tests to be produced to validate the new range.
- Forging processes with a hydraulic press or more generally vertical forging machines are generally easy to model because the principle of controlling the press is simple. Indeed, there is only a translational movement of the press during forging. However, these forging processes are not very suitable for producing crowns or rings without welding, for example. In order to allow optimal use of the material, a circular rolling process is therefore used to produce such parts.
- the commands for the tools are given as input to a rolling mill control system by an operator, and depend on the part to be rolled.
- the operator wishes to roll a new part, he must first determine the input data, which are not only the final dimensions of the part to be obtained, but the joint evolution of these dimensions.
- the rolling process can be modeled numerically by finite element calculations that do not take into account the adaptive operation of the rolling mill tools managed by the control system. In this case, it is generally necessary to machine at least one part to control the quality of the forging range and to recover acquisition data, in particular the tool displacement data and the force data exerted by the tools. during the rolling of the part, to integrate them into the modeling of the rolling process.
- An object of the invention is to remedy at least in part the aforementioned drawbacks by proposing a modeling method taking into account the behavior of all the mobile tools of a circular rolling mill, and their interactions, making it possible to determine ranges of forges reliably and quickly.
- This object is achieved by the present invention thanks to a method for modeling the behavior of a circular rolling mill intended to roll a cylindrical part from a set point, the circular rolling mill comprising at least one conical roller, configured to have a movement of translation in a first direction, and a mandrel, configured to have a movement of translation in a second direction, the setpoint comprising a setpoint for the speed of increase of an outer diameter of said cylindrical part as a function of said outer diameter, and a setpoint for the height of the cylindrical part in the first direction as a function of a thickness of the cylindrical part in the second direction, said method comprising the steps of: E1- obtaining a first set of parameters characteristic of the behavior of the circular rolling mill by means of a control formula linking a translational speed of the mandrel in the second direction direction of translation at the rate of increase of the external diameter and function of the setpoint; E2- Calculation by finite elements of a force value exerted on the conical roller from the first set of parameters; E3- Comparison of the value
- the first set of parameters obtained by the control formula comprises a speed of movement of the conical roller h and a speed of translation of the mandrel s;
- control formula is given by: with s the position of the mandrel, s the speed of translation of the mandrel, D the speed of increase of the external diameter D of the piece to be rolled;
- the at least one admissible force threshold value depends on the outer diameter of the cylindrical part
- Figure 1 schematically illustrates a circular rolling mill for rolling a cylindrical part.
- Figures 2a and 2b schematically illustrate steps of a method for modeling the behavior of a circular rolling mill according to the invention.
- Figure 3 schematically illustrates a cylindrical part that can be obtained by a circular rolling process.
- Figure 4 illustrates examples of input setpoints for a circular rolling mill.
- Figure 5 schematically illustrates a system for controlling the movements of mobile tools of the circular rolling mill of Figure 1.
- Figure 6 illustrates different stages defined by threshold force values admissible by a conical roll of the rolling mill.
- FIG. 7 is a graph representing the evolution of the axial force at the level of a conical roller, calculated by a modeling obtained by a method according to the invention, by a modeling of the prior art, and measured experimentally.
- FIG. 8 is a graph representing the evolution of the radial force at the level of a mandrel, calculated by a modeling obtained by a method according to the invention, by a modeling of the prior art, and measured experimentally.
- FIG. 9 is a graph representing the evolution of the external diameter of a part during rolling, calculated by a modeling obtained by a method according to the invention, by a modeling of the prior art, and measured experimentally.
- FIG. 10 is a graph representing the evolution of the rate of increase in the external diameter of a part during rolling, calculated by a modeling obtained by a method according to the invention, by a modeling of the art earlier, and measured experimentally.
- FIG 1 schematically illustrates moving tools of a system allowing the production of a cylindrical part called crown 5 during a circular rolling process illustrated in Figures 2a and 2b.
- the circular rolling mill 1 comprises at least one conical roller 3, in translation along a first direction Y, and in rotation along a roller direction X'.
- the circular rolling mill 1 comprises an upper conical roller 3 and a lower conical roller 3'.
- the circular rolling mill comprises a motor cylinder 4 in rotation around an axis tangent to the first direction Y, substantially vertical.
- the engine cylinder 4 is driven in rotation speed by a control unit 10, illustrated schematically in Figure 5.
- the rolling mill 1 comprises another cylindrical tool called mandrel 2, also in rotation around an axis in the first direction Y.
- the mandrel 2 can be translated in a second direction X, substantially orthogonal to the first direction Y.
- the translation movement and the rotational movement of the mandrel 2 are controlled by the control unit 10.
- FIG. 3 illustrates an example of a cylindrical ring 5 that can be obtained by rolling a billet with the circular rolling mill 1.
- an operator can place the crown 5 under the at least one conical roller 3 and between the mandrel 2 and the motor cylinder 4.
- a rotational movement of the conical roller 3 simultaneous with a translational movement of the conical roller 3 makes it possible to change the height a of the crown 5.
- rotational movements of the motor cylinder 4 and of the mandrel 2, simultaneous d a translational movement of the mandrel 2 makes it possible to change the thickness e of the crown.
- the input instructions include at least the desired dimensions of the cylindrical crown 5 to be rolled.
- the input instructions also include the laws of evolution of the dimensions of the crown 5.
- the setpoint includes a setpoint for the rate of increase ⁇ (D) of the external diameter of the cylindrical crown 5 as a function of the external diameter D.
- the setpoint may include a height setpoint a(e) of the cylindrical crown 5 along the first direction Y as a function of the thickness e of the crown 5 along the second direction X.
- An example of such input setpoints is illustrated on Figure 4.
- control unit 10 can control the translational and rotational movements of the tools 2, 3, 4 in motion of the rolling mill 1, as illustrated schematically in FIG. 5
- Each forge range is associated with a specific instruction.
- the circular rolling process stops once the desired external diameter Dtarget is reached.
- a first step E1 of the process for modeling the behavior of the circular rolling mill 1 is to determine a control formula, making it possible to link the input setpoint to at least one movement of a mobile tool 2.3 of the rolling mill 1.
- the control formula piloting makes it possible to obtain a first set of parameters characteristic of the behavior of the circular rolling mill 1 .
- the relationship between the rate of increase D of the external diameter D and the rate of increase é of the thickness e also depends on the other parameters of the crown 5, that is to say its height a, its external diameter D and its thickness e.
- control formula which has been identified to reproduce part of the behavior of the rolling mill 1 as well as the main instructions entered by the operator in the control unit 10 of the rolling mill 1 is given by: with s the position of the mandrel directly linked to the thickness e of the ring, s the speed of translation of the mandrel directly linked to the speed of increase é of the thickness e of the ring, h the position of the conical roller, h travel speed of the conical roller h.
- This nonlinear control formula makes it possible to obtain a first translation speed of the mandrel s of the theoretical thickness s, respecting the input instructions, as illustrated in figure 4.
- the relationship between the rate of increase D of the external diameter D and the rate of increase h of the position h also depends on the other parameters of the crown 5, that is to say on its height a, on its external diameter D and its thickness e.
- the control formula making it possible to obtain the first set of parameters characteristic of the behavior of the circular rolling mill 1 can be integrated into a computer code by finite elements. In an exemplary embodiment, it can be integrated into the Forge calculation code by the Transvalor calculation code editor.
- the finite element calculation code makes it possible to model the rolling process and in particular to calculate a force F CO ne exerted by the conical roller 3 on the crown 5 during a rolling process as a function of the first set of parameters.
- the mechanical characteristics of the circular rolling mill 1 can be taken into account.
- the force F CO ne exerted on the conical roller 3 does not exceed a threshold value F seU ii.
- the threshold value F seU ii depends on the outer diameter D of the crown 5 during rolling.
- the threshold value F se uii(D) can depend on the position in the second direction X of a point of the outer edge of diameter D of the crown 5, in contact with a surface of the conical roller 3.
- Dmax is the maximum outer diameter that can be rolled. Dmax is preferably less than the axial dimension of the conical roller 3 along the second direction X.
- the first mechanical model intervenes when the radial force F CO ne of the conical roller 3 exceeds the threshold value F seU ii.
- the modeling method comprises a step E3 of comparing the value of force F CO ne exerted on the conical roller 3 calculated with the threshold value of force F seU ii admissible by the rolling mill 1.
- the control formula for example one of the control formulas presented previously, is no longer applied.
- a constant force is applied by the conical roller 3 on the crown 5.
- the first mechanical model will thus modify the displacement of the conical roller 3, in order to ensure the maximum admissible force.
- the applied force of the first mechanical model being reduced compared to the theoretical force calculated by the finite element calculation code, this will imply a slowing down of the rate of increase D of the external diameter D.
- the second set of parameters is calculated by a control formula following only the entry setpoint in height h(s) of the crown 5 in the first direction Y as a function of the thickness s of the crown 5 in the second direction X, so that the increase speed setpoint D is not respected.
- FIG. 7 illustrates a comparison between the axial force F CO ne calculated by the proposed modeling method, in comparison with a modeling of the prior art not taking this mechanical model into account, and with experimental force measurements. It can be seen that the proposed modeling method makes it possible to account more reliably for the axial force on the conical roller 3.
- the diameter D of the crown 5 calculated will increase to a diameter value causing the force level to change. If the force value exerted on the calculated conical roller 3 is less than the new admissible force threshold value, the set of parameters is calculated according to the control formula in normal operation.
- step E3 of the proposed modeling method the first set of parameters or the possible second set of parameters are corrected in order to obtain a third set of corrected parameters, making it possible to translate the kinematics of all the mobile tools of the circular rolling mill 1, and in particular of the mandrel 2.
- the third set of parameters is thus characteristic of the behavior of the circular rolling mill 1 for the given instruction.
- the control formula as determined during the first step E1 uses a theoretical position of the mandrel 2.
- the mandrel 2 may be contained in a cage which deforms elastically during the rolling process, which has the effect of disturbing the position of the mandrel 2. It has in fact been observed empirically that the thickness e actual crown 5 was generally greater than the theoretical thickness e. It was identified that the control unit 10 of the circular rolling mill 1 did not take into account the deformation of the cage of the mandrel 2 in the control during the rolling process.
- the elastic deformation of the cage of the mandrel 2 can be modeled simply as the deformation of a spring fixed between the mandrel 2 and the cylinder 21 allowing the translation movement according to the second direction X of the mandrel 2.
- the cage of the mandrel 2 behaves like a spring of stiffness k, radially exerting a force on the crown 5 depending on the position of the mandrel 2 according to the axis of second direction X.
- the offset applied in correction may depend on the radial force calculated by the finite element calculation code.
- the set of parameters includes the rate of increase s of the thickness s of the crown 5, which directly depends on the translational movement of the mandrel 2, the addition of this second mechanical modeling is relevant. because the fact of taking into account the stiffness of the mandrel 2 makes it possible to change the theoretical stroke of the latter, which is notably influenced by the virtual deformation of the cage.
- this second mechanical model can be fully integrated by Transvalor into the Forge calculation code.
- Figure 8 illustrates a comparison between the radial force calculated by the proposed modeling method, in comparison with prior art modeling that does not take this second mechanical model into account, and with experimental force measurements. It can be seen that the proposed modeling process makes it possible to account more reliably for the radial force on the mandrel 2.
- the method of modeling the behavior of the circular rolling mill 1 as presented makes it possible to obtain a complete model predicting the behavior of the circular rolling installation.
- Figures 9 and 10 illustrate the comparison between the evolution of the external diameter D of the crown 5 and the rate of increase D of the external diameter of the crown 5, calculated by a model of the prior art, by the model presented and obtained by experimental measurements.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
- Numerical Control (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2009788A FR3114524B1 (fr) | 2020-09-25 | 2020-09-25 | Procédé de modélisation de comportement d’un laminoir circulaire |
| PCT/FR2021/051603 WO2022064127A1 (fr) | 2020-09-25 | 2021-09-20 | Procédé de modélisation de comportement d'un laminoir circulaire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4217130A1 true EP4217130A1 (fr) | 2023-08-02 |
| EP4217130B1 EP4217130B1 (fr) | 2025-09-17 |
Family
ID=74592053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21790945.6A Active EP4217130B1 (fr) | 2020-09-25 | 2021-09-20 | Procédé de modélisation de comportement d'un laminoir circulaire |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US12343777B2 (fr) |
| EP (1) | EP4217130B1 (fr) |
| CN (1) | CN116209531B (fr) |
| FR (1) | FR3114524B1 (fr) |
| WO (1) | WO2022064127A1 (fr) |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54155977A (en) * | 1978-05-30 | 1979-12-08 | Sumitomo Metal Ind Ltd | Automatic controlling method for rolling force in ring rolling mill |
| DE2923001A1 (de) * | 1979-06-07 | 1981-01-22 | Thyssen Industrie | Ringwalzmaschine mit dornwalzen- revolverkopf |
| JP4168598B2 (ja) * | 2000-08-14 | 2008-10-22 | 三菱マテリアル株式会社 | 回転塑性加工の数値シミュレーション方法及び記録媒体及びプログラム |
| JP3627654B2 (ja) * | 2001-01-09 | 2005-03-09 | Jfeスチール株式会社 | リングローリング圧延機によるリング状被圧延材の圧延方法及び制御装置 |
| KR101164538B1 (ko) * | 2010-02-03 | 2012-07-10 | 서강대학교산학협력단 | 링 압연 스케줄의 최적 설계 방법 |
| JP6350919B2 (ja) * | 2013-03-21 | 2018-07-04 | 日立金属株式会社 | リング圧延用素材の製造方法 |
| CN106583609B (zh) * | 2016-12-02 | 2018-12-25 | 西北工业大学 | 一种弱刚度环件轧制过程中抱辊力的控制方法及系统 |
| CN109732022B (zh) * | 2018-10-29 | 2020-04-03 | 西北工业大学 | 一种环轧机抱辊运动轨迹的优化方法 |
| CN111069486B (zh) * | 2019-11-13 | 2021-02-19 | 重庆大学 | 一种确保轧制过程具有较大壁厚差的大型环件稳定轧制的方法 |
| CN111283124B (zh) * | 2020-02-25 | 2021-07-06 | 西北工业大学深圳研究院 | 确定环件径向轧制中由环增速驱动的芯辊进给速度的方法 |
| JP2020203942A (ja) | 2020-09-16 | 2020-12-24 | ダイキン工業株式会社 | パーフルオロアルカジエン化合物の製造方法 |
-
2020
- 2020-09-25 FR FR2009788A patent/FR3114524B1/fr active Active
-
2021
- 2021-09-20 CN CN202180065744.XA patent/CN116209531B/zh active Active
- 2021-09-20 EP EP21790945.6A patent/EP4217130B1/fr active Active
- 2021-09-20 US US18/028,296 patent/US12343777B2/en active Active
- 2021-09-20 WO PCT/FR2021/051603 patent/WO2022064127A1/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| EP4217130B1 (fr) | 2025-09-17 |
| FR3114524B1 (fr) | 2022-08-19 |
| CN116209531B (zh) | 2026-04-10 |
| FR3114524A1 (fr) | 2022-04-01 |
| US20230372988A1 (en) | 2023-11-23 |
| CN116209531A (zh) | 2023-06-02 |
| WO2022064127A1 (fr) | 2022-03-31 |
| US12343777B2 (en) | 2025-07-01 |
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