EP3086889B1 - Procédé de laminage à chaud, laminoir à chaud et produit programme d'ordinateur pour la mise en oeuvre d'un tel procédé - Google Patents

Procédé de laminage à chaud, laminoir à chaud et produit programme d'ordinateur pour la mise en oeuvre d'un tel procédé Download PDF

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Publication number
EP3086889B1
EP3086889B1 EP13824153.4A EP13824153A EP3086889B1 EP 3086889 B1 EP3086889 B1 EP 3086889B1 EP 13824153 A EP13824153 A EP 13824153A EP 3086889 B1 EP3086889 B1 EP 3086889B1
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EP
European Patent Office
Prior art keywords
rolling
regulating
réel
parameters
sortie
Prior art date
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EP13824153.4A
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German (de)
English (en)
French (fr)
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EP3086889A1 (fr
Inventor
Christian Moretto
Nicolas PETHE
Andrey COUTURIER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ArcelorMittal SA
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ArcelorMittal SA
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Priority to PL13824153T priority Critical patent/PL3086889T3/pl
Priority to HUE13824153 priority patent/HUE044992T2/hu
Publication of EP3086889A1 publication Critical patent/EP3086889A1/fr
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Publication of EP3086889B1 publication Critical patent/EP3086889B1/fr
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Classifications

    • 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
    • B21B1/22—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 plates, strips, bands or sheets of indefinite 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
    • B21B1/22—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 plates, strips, bands or sheets of indefinite length
    • B21B2001/225—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 plates, strips, bands or sheets of indefinite length by hot-rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/12—Rolling load or rolling pressure; roll force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/20—Slip
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/02—Speed
    • B21B2275/04—Roll speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/02—Speed
    • B21B2275/06—Product speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/06—Lubricating, cooling or heating rolls
    • B21B27/10—Lubricating, cooling or heating rolls externally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0239—Lubricating
    • B21B45/0245—Lubricating devices
    • B21B45/0248—Lubricating devices using liquid lubricants, e.g. for sections, for tubes
    • B21B45/0251—Lubricating devices using liquid lubricants, e.g. for sections, for tubes for strips, sheets, or plates

Definitions

  • the invention relates to the hot rolling of metallurgical products. More specifically, it relates to a method of controlling at least one parameter of the hot rolling process.
  • the hot-rolled strip thus obtained can then be subjected to heat or mechanical treatments which will give it its final properties, or undergo a cold rolling which will further reduce its thickness before the completion of the final heat or mechanical treatments.
  • the steel strip is subjected to a specific thermal and mechanical path (reduction, temperature) which is influenced by the friction between the working rolls and the band in the gap between the rollers.
  • This path has a major influence on the quality of the band (surface appearance and metallurgical properties).
  • the regulation of the coefficient of friction is in particular ensured by the lubrication process.
  • lubrication is generally carried out at each roll stand by injecting an emulsion composed of water and a lubricating fluid, usually oil, onto the cylinder at the gap, see for example the document US Patent 3605473 .
  • THR Very High Strength, generally between 450 and 900 MPa
  • UHR Ultra High Strength, generally greater than 900 MPa
  • new formats for example band thicknesses less than 3mm.
  • these steels such as USIBOR® or Dual Phase steels are naturally harder and require the application of a greater rolling force, which reduces the capacity of the rolling mill.
  • These steels may also have a surface composition such that it has less scale which usually acts as the first lubricating element.
  • JP-A-2008264828 discloses a hot rolling method in which the working rolls are coated with a coating layer of specific composition to ensure a certain coefficient of friction value.
  • JP-A-2005146094 discloses a hot rolling method wherein slip of the strip would be avoided by using a lubricating oil of particular composition.
  • JPH-A-1156410 discloses a method in which the clamping force of the applied rolling rolls would be measured by sensor, then the amount of lubricating oil injected would be adjusted so that the measured rolling force is equal to a target value.
  • This solution aims to adjust the coefficient of friction during the process but does not take into account all the parameters on which the coefficient of friction depends, which makes it inefficient.
  • this solution involves significant risks of instabilities of the rolling process, such as. variations in speed or traction, if the amount of lubricant to be supplied to achieve the required force is important.
  • the object of the invention is therefore to provide a rolling method in which the coefficient of friction is reliably and effectively controlled during production in order to avoid rolling incidents and to obtain optimum performance.
  • the object of the invention is also preferably to provide a method reducing the instabilities of the rolling process and allowing lubrication over the entire length of the strip.
  • the invention firstly relates to a control method according to claim 1.
  • This control method may also include the features of claims 2 to 7, singly or in combination.
  • the invention also relates to a rolling method according to claim 8.
  • This rolling method may also include the features of claims 9 to 13, taken alone or in combination.
  • the invention also relates to a hot rolling mill according to claim 14.
  • This mill may also include the features of claim 15.
  • the invention also relates to a computer program product according to claim 16.
  • the figure 1 shows a metal strip B during rolling in a rolling mill comprising two cages 1, 2 in which the band B is simultaneously under the influence, for example a finishing mill for the hot rolling of the steel strips.
  • Rolling mills of this type generally have 5, 6 or 7 cages.
  • Each of the cages 1, 2 comprises, conventionally, two working rolls 1a, 1a 'and 2a, 2a' and two support rolls 1b, 1b 'and 2b, 2b'.
  • Each cage is activated by a motor torque C 1 , C 2 (not shown).
  • the distance between the two working cylinders, respectively 1a -1a 'and 2a-2a' is called the air gap S (not shown) and is adjusted by means of clamping screws 7.
  • the lubrication of the cylinders is ensured at each of the cages by an injection device 3, such as for example projection nozzles for projecting an emulsion of oil and water.
  • a speed measuring device 4 is disposed at the exit of the first cage in the running direction of the strip, this device 4 makes it possible to measure the speed of the strip at the exit of the strip.
  • v- output and v- cage speeds can be expressed in any speed unit, provided they are both expressed in that same unit. In the same way the unit in which the angular velocity ⁇ is expressed must be coherent with that of v cage .
  • a device 5 for measuring force to measure in real time the clamping force F of the working rolls is also provided at each cage.
  • These devices may for example be strain gauges installed on the cage uprights or under the clamping screws 7.
  • the measured tightening force F and the speed of the output band C output are transmitted to a processing unit 6 which can then, according to these measurements and other parameters previously recorded, send instructions by example to the lubricating emulsion injection nozzles 3 or to the clamping screws 7.
  • a processing unit 6 for implementing a first embodiment of the regulation method according to the invention is described below with reference to FIG. figure 3 .
  • the speed of the output band of the exit v-cage and the angular velocity of the work rolls ⁇ are measured in line and their values are sent to a first computer 8.
  • This first computer 8 comprises at least one internal memory on which the value of the radius R of the working rolls is stored, which makes it possible to calculate the linear speed of the working rolls v cage and then the value of the slip ratio.
  • forward FWS according to formula 1.
  • the calculated value FWS is then transmitted to a second computer 9 which also receives as input the value of the clamping force F measured in real time by the sensor 5.
  • This second computer comprises at least one internal memory on which are stored the parameters P 1 . These parameters P 1 depend on the model chosen for the calculation of the real coefficient of friction ⁇ .
  • Orowan model As an example we will describe below the use for the purposes of the invention Orowan model, but other models known to those skilled in the art may be used, such as the model of SIMS or Bland & Ford.
  • the general theory of each of these three models is described for example in E.Orowan, Proceedings of the Institute of Mechanical Engineers, June 1943, vol.150, No. 1,140-167 for the Orowan model , RB Sims, Proceedings of the Institute of Mechanical Engineers, June 1954, vo1.168, No. 1 191-200 for the Sims Model , " The Calculation of Roll and Torque Force in Cold Strip Rolling with Tensions, "DR Bland and H. Ford, Proceedings of the Institute of Mechanical Engineers, June 1948, vol.149, p.144, for the Bland & Ford model .
  • Orowan P 1 To calculate in real time the actual friction coefficient ⁇ using the model Orowan P 1 parameters are input thicknesses e input and output an output of the band, ⁇ entry input and output tractions ⁇ output of the band, these parameters being in the present example fixed at the beginning of rolling but can also be estimated or measured in real time. These parameters are illustrated in figure 2 .
  • the second computer 9 thus calculates the real coefficient of friction ⁇ given to a processor 10.
  • the computation time of real ⁇ is less than or equal to 100 ms and preferably less than or equal to 50 ms.
  • the input data processor 10 are real ⁇ , a target value of target friction coefficient ⁇ determined from graphs or modeling, depending on the steel grade of the rolled strip, the number of kilometers strips laminated on the installation in question, the wear of the rollers, the type of oil used, etc. as well as a parameter ⁇ 0 .
  • This parameter is the initial value of the process parameter ⁇ which will be used to regulate the real coefficient of friction ⁇ .
  • This parameter may be, for example, the oil injection rate Q of the lubricating oil.
  • the initial value can be determined for example using charts or by modeling.
  • the value of the actual ⁇ friction coefficient is then compared with the target value of friction coefficient ⁇ target. If the absolute value of the difference between these two values
  • the time elapsing between the measurement of the strip exit speed v output and receiving the setpoint ⁇ n is less than or equal to 500 ms and preferably less than or equal to 150 ms.
  • the figure 4 represents a control scheme according to a second embodiment of the invention.
  • the Orowan model parameters P 2 are the input thicknesses e input and output an output of the band, the input traction ⁇ input and output output ⁇ of the strip, the radius R of the rollers, these parameters being in the present example set at the beginning of rolling, but can also be estimated or measured in real time.
  • P2 also includes the milling module M of the mill stand considered. This module, generally expressed in t / mm, characterizes the elastic deformation of the cage related to the rolling force.
  • the processor calculates for example the value of rolling force F 'which should be applied to obtain the thickness e output
  • the units of these three quantities must be coherent with each other and may for example be in Newton for the forces F and F 'and in N / mm for the curing module M.
  • treatment units described above with reference to Figures 3 and 4 contain different elements such as computers or processors but one could consider a single processor for performing the various calculation operations and instructions, or any other possible configuration for calculation steps and instructions.
  • a hot rolling method according to the invention was made with a Drawn and Wall Ironed (DWI) steel strip, the lubricating oil used being a commercial standard oil.
  • DWI Drawn and Wall Ironed
  • the injection rate Q oil is zero during the rolling of the tape head. This is voluntary this test being mainly devoted to the lubrication of the tail of tape.
  • the figure 6 represents the thickness of the strip at the output of the cage e output as a function of the rolling time. There is a drop of this thickness e output after 10 seconds, this decrease corresponds to what has been explained above.
  • the modification of the injected oil flow rate Q oil causes a change in the force F applied and in this case a significant decrease in the thickness e exit of the strip at the exit of the cage. Thanks to the regulation illustrated in figure 4 a new clamping force F 'is calculated and the air gap S modified accordingly in order to obtain a thickness of output e output according to the expectations of the customer. The increase and the maintenance of the thickness e output are visible on this figure 6 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Metal Rolling (AREA)
EP13824153.4A 2013-12-24 2013-12-24 Procédé de laminage à chaud, laminoir à chaud et produit programme d'ordinateur pour la mise en oeuvre d'un tel procédé Active EP3086889B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL13824153T PL3086889T3 (pl) 2013-12-24 2013-12-24 Sposób walcowania na gorąco, walcownia gorąca i program komputerowy do wykonywania takiego sposobu
HUE13824153 HUE044992T2 (hu) 2013-12-24 2013-12-24 Meleghengerlési eljárás, meleghengersor és számítógépi program az eljárás végrehajtására

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2013/002865 WO2015097488A1 (fr) 2013-12-24 2013-12-24 Procede de laminage a chaud

Publications (2)

Publication Number Publication Date
EP3086889A1 EP3086889A1 (fr) 2016-11-02
EP3086889B1 true EP3086889B1 (fr) 2019-02-06

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EP13824153.4A Active EP3086889B1 (fr) 2013-12-24 2013-12-24 Procédé de laminage à chaud, laminoir à chaud et produit programme d'ordinateur pour la mise en oeuvre d'un tel procédé

Country Status (17)

Country Link
US (1) US10870138B2 (uk)
EP (1) EP3086889B1 (uk)
JP (1) JP6342003B2 (uk)
KR (2) KR102110645B1 (uk)
CN (1) CN105916603B (uk)
AU (1) AU2013409182B2 (uk)
BR (1) BR112016014762B1 (uk)
CA (1) CA2935193C (uk)
ES (1) ES2724456T3 (uk)
HU (1) HUE044992T2 (uk)
MA (1) MA39044B1 (uk)
MX (1) MX2016008454A (uk)
PL (1) PL3086889T3 (uk)
RU (1) RU2670630C9 (uk)
UA (1) UA117508C2 (uk)
WO (1) WO2015097488A1 (uk)
ZA (1) ZA201603733B (uk)

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Publication number Publication date
UA117508C2 (uk) 2018-08-10
US10870138B2 (en) 2020-12-22
WO2015097488A1 (fr) 2015-07-02
MX2016008454A (es) 2016-10-14
CN105916603B (zh) 2018-09-07
HUE044992T2 (hu) 2019-11-28
JP2017500208A (ja) 2017-01-05
US20160318080A1 (en) 2016-11-03
AU2013409182A1 (en) 2016-07-14
RU2670630C9 (ru) 2018-11-26
PL3086889T3 (pl) 2019-08-30
MA39044B1 (fr) 2018-11-30
AU2013409182B2 (en) 2017-08-31
CA2935193C (fr) 2018-12-04
KR20180004332A (ko) 2018-01-10
JP6342003B2 (ja) 2018-06-13
ZA201603733B (en) 2017-07-26
ES2724456T3 (es) 2019-09-11
CA2935193A1 (fr) 2015-07-02
CN105916603A (zh) 2016-08-31
BR112016014762A2 (uk) 2017-08-08
RU2016130269A (ru) 2018-01-30
KR20160101153A (ko) 2016-08-24
EP3086889A1 (fr) 2016-11-02
BR112016014762B1 (pt) 2022-03-15
KR102110645B1 (ko) 2020-05-14
RU2670630C2 (ru) 2018-10-24

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