EP4212259B1 - Réduction des défauts de surface lors du laminage de finition du feuillard à chaud - Google Patents

Réduction des défauts de surface lors du laminage de finition du feuillard à chaud Download PDF

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Publication number
EP4212259B1
EP4212259B1 EP22151963.0A EP22151963A EP4212259B1 EP 4212259 B1 EP4212259 B1 EP 4212259B1 EP 22151963 A EP22151963 A EP 22151963A EP 4212259 B1 EP4212259 B1 EP 4212259B1
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EP
European Patent Office
Prior art keywords
hot strip
rolling
cooling
roll
finishing train
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.)
Active
Application number
EP22151963.0A
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German (de)
English (en)
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EP4212259A1 (fr
EP4212259C0 (fr
Inventor
Heinz Fuerst
Franz Hermann Glaser
Simon Grosseiber
Slaven Ilic
Lukas Preuler
Juergen Schiefer
Christian Strasser
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Primetals Technologies Austria GmbH
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Primetals Technologies Austria GmbH
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Publication date
Application filed by Primetals Technologies Austria GmbH filed Critical Primetals Technologies Austria GmbH
Priority to EP22151963.0A priority Critical patent/EP4212259B1/fr
Priority to US18/081,517 priority patent/US20230226584A1/en
Priority to CN202310049265.XA priority patent/CN116460140A/zh
Publication of EP4212259A1 publication Critical patent/EP4212259A1/fr
Application granted granted Critical
Publication of EP4212259B1 publication Critical patent/EP4212259B1/fr
Publication of EP4212259C0 publication Critical patent/EP4212259C0/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/22—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories for rolling metal immediately subsequent to continuous casting, i.e. in-line rolling of steel
    • 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
    • B21B1/46—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 metal immediately subsequent to continuous casting
    • B21B1/463—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 metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • 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
    • B21B1/227—Surface roughening or texturing
    • 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
    • B21B1/24—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 in a continuous or semi-continuous process
    • B21B1/26—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 in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • 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
    • B21B28/00—Maintaining rolls or rolling equipment in effective condition
    • B21B28/02—Maintaining rolls in effective condition, e.g. reconditioning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
    • B21B39/04—Lifting or lowering work for conveying purposes, e.g. tilting tables arranged immediately in front of or behind the pass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B39/14—Guiding, positioning or aligning work
    • B21B39/16—Guiding, positioning or aligning work immediately before entering or after leaving the pass
    • B21B39/165—Guides or guide rollers for rods, bars, rounds, tubes ; Aligning guides
    • 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
    • B21B45/004—Heating the product
    • 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
    • B21B45/0269—Cleaning
    • B21B45/0275—Cleaning devices
    • B21B45/0278—Cleaning devices removing liquids
    • B21B45/0281—Cleaning devices removing liquids removing coolants
    • 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
    • B21B45/0269—Cleaning
    • B21B45/0275—Cleaning devices
    • B21B45/0287—Cleaning devices removing solid particles, e.g. dust, rust
    • 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
    • B21B45/04—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 de-scaling, e.g. by brushing
    • 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
    • B21B2027/103—Lubricating, cooling or heating rolls externally cooling externally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
    • B21B39/10—Arrangement or installation of feeding rollers in rolling stands

Definitions

  • the present invention relates to the technical field of hot rolling, preferably of steel.
  • hot rolling typically takes place in a so-called hot rolling mill or a casting-rolling combination plant in which a continuous casting machine is coupled in-line with the hot rolling mill.
  • the strand typically produced continuously in the continuous casting machine is either immediately finish-rolled in a finishing mill to form a finished strip or the strand is first pre-rolled in a roughing mill to form a pre-strip and the pre-strip is immediately finish-rolled in the roughing mill to form the finished strip.
  • a finishing rolling mill according to the preamble of claim 1 or claim 6 is known, for example, from EN 10 2008 019548 A1 known.
  • the surface quality of hot-rolled strip can be problematic. According to the current state of technology, parts that must have a high or very high surface quality, such as exterior body parts, must be produced by cold rolling. This greatly increases the energy consumption and the costs of production. The current state of technology does not indicate how the surface quality of hot-rolled strip can be improved without increasing the energy consumption.
  • the object of the invention is to modify a finishing rolling mill for the production of very thin hot strip in such a way that the surface quality of the hot strip produced is improved without, however, significantly increasing the energy consumption during production. This should also enable the thin hot strip produced to be used for applications with high demands on surface quality.
  • the solution is provided by a finishing rolling mill for finish rolling (thin or very thin) hot strip, preferably made of steel, wherein the finishing rolling mill has several rolling stands, wherein the rolling stands each have a lower and an upper work roll and the work rolls each form a roll gap, so that the hot strip passes through the roll gap in the transport direction during finish rolling and is finish rolled in the process, wherein during finish rolling at least one exit-side region of the lateral surface of the lower work roll of the last rolling stand in the transport direction is cooled by several cooling nozzles arranged below a pass line and the cooling nozzles spray a liquid cooling medium onto the lateral surface, wherein the cooling medium is kept away from the hot strip by at least one scraper arranged in the vertical direction between the cooling nozzles and the hot strip, wherein the scraper is attached to an exit table , and wherein at least one cleaning nozzle is provided for cleaning the top of the exit table with a liquid or gaseous medium, so that scale and/or rolling dust are removed at least from the top of the run
  • the outer surfaces of the work rolls are cooled by a liquid coolant (e.g. cooling water) in order to increase the service life of the work rolls and to prevent temperature-related deformation of the roll contour.
  • a liquid coolant e.g. cooling water
  • the coolant is kept away from the rolled stock/hot strip by scrapers.
  • the exit table is cleaned either continuously during hot rolling or depending on the time in which hot strip is rolled.
  • the exit table is preferably cleaned during hot rolling using short pulses with relatively high pressure. This achieves a better cleaning effect than continuous cleaning or spraying/flushing with low or medium pressure.
  • the pulses can be generated, for example, by a valve that is arranged in the medium supply line.
  • the cleaning nozzle or nozzles can be provided not only on the last rolling stand of the finishing mill, but also on other or all rolling stands. It is also possible to clean not only the run-out table, but also the so-called infeed table (i.e. the table on the infeed side).
  • the cleaning nozzle or nozzles are arranged essentially horizontally (and thus in the width direction of the hot strip) so that residues are sprayed or rinsed off the exit table in the width direction of the hot strip.
  • the cleaning nozzles are typically pressurized with a liquid cooling medium, preferably the same cooling medium that is used to cool the work rolls. This creates a jet at the front of the spray nozzle that sprays the top of the run-out table.
  • a gaseous medium e.g. air
  • the cleaning nozzles are designed as flat jet nozzles and especially if the cleaning nozzle on the drive side is offset in the transport direction from the cleaning nozzle on the operator side.
  • the spray jets are prevented from meeting in the middle of the hot strip, so that particles are always removed from the strip.
  • the cleaning nozzle is not arranged exactly horizontally, but is inclined by an angle ⁇ to the horizontal, so that the upper side of the run-out table is cleaned or sprayed without, however, impacting the underside of the hot strip.
  • At least one lifting roller arranged in the width direction of the hot strip is arranged in the transport direction between the last rolling stand and a cooling section for cooling the finish-rolled hot strip, and the lifting roller lifts the hot strip in the vertical direction above the pass line during finish rolling so that the underside of the hot strip does not touch the run-out table.
  • a simple hose or tubing connection of the cleaning nozzle(s) is achieved when a pipe or hose line fluidically connects a cooling nozzle with at least one cleaning nozzle.
  • the solution is provided by a finishing rolling mill for finish rolling (thin or very thin) hot strip, preferably made of steel, wherein the finishing rolling mill has several rolling stands, wherein the rolling stands each have a lower and an upper work roll and the work rolls each form a roll gap, so that the hot strip passes through the roll gap in the transport direction and is finish rolled, wherein during finish rolling at least one outlet-side area of the shell surface the lower work roll of the last rolling stand in the transport direction is cooled by a plurality of cooling nozzles arranged below a pass line, and the cooling nozzles spray a liquid cooling medium onto the outer surface, wherein the cooling medium is kept away from the hot strip by at least one scraper arranged in the vertical direction between the finish-rolled hot strip and the cooling nozzles, wherein the scraper is fastened to a run-out table, wherein at least one lifting roller arranged in the width direction of the hot strip is arranged between the last rolling stand and a cooling section for cooling the finish-rolled hot strip in the transport direction, and the
  • a first, preferably optical, surface inspection unit for inspecting the top side of the hot strip is arranged between the lifting roller and a first cooling unit of the cooling section.
  • a pyrometer and a first blow-off device for blowing off the top of the hot strip are arranged between the last rolling stand and the first surface inspection unit.
  • the pyrometer is preferably located in front of the blow-off device in the transport direction.
  • a second, preferably optical, surface inspection unit for inspecting the underside of the hot strip is arranged between a last cooling unit of the cooling section and a shear.
  • a pyrometer and a second blow-off device for blowing off the top of the hot strip are arranged between the second surface inspection unit and the shears.
  • the blow-off device is preferably located in front of the pyrometer in the transport direction.
  • a driving roller unit with at least one drivable driving roller that can be positioned on the hot strip is arranged between the second blow-off device and the shears.
  • the finishing rolling mill comprises a controller connected to a drive for raising the lifting roller and the second surface inspection unit for inspecting the underside of the hot strip, the controller further raising the lifting roller as soon as the second surface inspection unit detects surface defects on the underside of the hot strip.
  • the information about surface defects on the underside of the hot strip is automatically used to further raise the lifting roller and thus increase the distance between the hot strip and the passline.
  • the lifting roller can also be extended further manually.
  • a combined casting and rolling plant comprises a continuous casting plant for continuously casting a strand, optionally a roughing mill for roughing the strand into an intermediate strip, and the finishing mill according to the invention.
  • an induction heater for heating the intermediate strip to rolling temperature is preferably arranged between the typically multi-stand roughing mill and the finishing mill.
  • a tunnel furnace is arranged in front of the roughing mill for heating and/or maintaining the temperature of the strand.
  • the roughing mill has three rolling stands and the finishing mill has five rolling stands. This configuration has proven itself in Arvedi ESP plants and is also a great advantage for other combined casting and rolling plants.
  • the Fig. 1 shows a diagram of a casting-rolling combined plant for producing thin hot-rolled steel strip.
  • Liquid steel is cast in the mold 2 of the continuous casting machine 1 to form a strand with a slab or thin-slab cross-section and is continuously drawn out of the mold 2.
  • the strand is supported, guided and cooled further in the curved strand guide 3 and then bent back to the horizontal.
  • the solidified strand is then pre-rolled in the pre-rolling train 4 to form a pre-strip.
  • the pre-strip is then heated to rolling temperature by the furnace 5, preferably an induction furnace with several induction modules, and descaled by a descaler 6 before entering the finishing train 7.
  • the pre-strip is finish-rolled to form the hot strip (also called finished strip).
  • the finished strip typically has a thickness of between 0.6 and 3.6 mm.
  • the hot strip 11 is cooled to winding temperature in the cooling section 8 by several cooling units. Shortly before winding, the cooled hot strip 11 is cut into bundle lengths by a shear 9 and wound up by several reeling or winding devices 10 or alternatively by a rotating carousel coiler. In particular When producing thin or very thin hot strip, it is advantageous to operate the casting-rolling composite plant in continuous operation.
  • a lifting roller 18 for lifting the finished strip over the pass line P and/or at least one cleaning nozzle 17 for cleaning the upper side of the run-out table 15 with a liquid medium (e.g. cooling water) or flushing with a gaseous medium (e.g. air) is present so that scale and/or rolling dust are removed from the run-out table 15.
  • a liquid medium e.g. cooling water
  • a gaseous medium e.g. air
  • the finish-rolled hot strip 11 is lifted over the pass line P by the lifting roller 18, which is arranged in the width direction of the hot strip 11, so that contact between the underside of the hot strip 11 and the run-out table 15 is avoided in any case.
  • At least the run-out table 15, and according to a variant for very thin strips also the run-in table 24, of at least the last rolling stand 7e of the finishing rolling train 7 is freed of scale and/or rolling dust by at least one cleaning nozzle 17, so that no contaminants can accumulate on the upper side of the run-out table 15, which could scratch the underside of the hot strip 11.
  • both cases mentioned are combined, ie a lifting roller 18 and at least one cleaning nozzle 17 are present after the last rolling stand 7e. This case is in Fig 2 shown.
  • the Figures 3 and 4 show the case in which three cleaning nozzles 17 are arranged on the run-out table 15, one on the drive side A and two on the operator side B of the rolling stand 7e.
  • the cleaning nozzles 17 each have an offset x in the transport direction T.
  • a further three cleaning nozzles 17 are arranged on the infeed table 24. These cleaning nozzles 17 also serve to clean the top of the infeed table by spraying or rinsing off scale, rolling dust, etc.
  • the Figures 5a and 5b show a front and a side view of a cleaning nozzle 17, which is arranged on the top of the discharge table 15.
  • the cleaning nozzle 17 is a flat jet nozzle, wherein the spray jet is wider than it is high.
  • the outlet opening of the cleaning nozzle 17 has a width b that is at least 3 times as wide as the height h of the outlet opening. This forms a flat full jet.
  • the cleaning nozzle 17 is inclined to the horizontal by the angle ⁇ , so that the top of the run-out table 15 without cooling the underside of the hot strip (not shown).
  • the Fig. 6 shows the last rolling stand 7e of the finishing rolling mill 7 with a lifting roller 18 for lifting the finished-rolled hot strip 11 above the pass line P.
  • the rotatable, horizontally arranged lifting roller 18 is lifted by a linear drive 23 so that the hot strip 11 comes to rest above the pass line P of the rolling stand 7e. This ensures that there is no contact between the underside of the hot strip 11 and the run-out table 15.
  • the hot strip 11 can be lifted in a position-controlled and/or force-controlled manner.
  • the position control sets an actual distance x in the vertical direction between the top of the run-out table 15 and the underside of the hot strip 11.
  • the force control prevents the typically thin or very thin hot strip 11 from being overstretched.
  • both controls are superimposed on each other so that both the position of the lifting roller 18 and the elongation of the hot strip 11 are adjusted in a controlled manner.
  • the photo in Fig. 7 shows a surface defect on the underside of a thin hot strip 11 which has been scratched by scale Z after finish rolling. These surface defects are avoided by the invention, thereby increasing the quality and yield of the hot strip.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)

Claims (15)

  1. Train de laminage de finition (7) pour le laminage de finition d'une bande à chaud (11),
    de préférence en acier,
    le train de laminage de finition (7) comprenant plusieurs cages de laminage (7a...7e),
    les cages de laminoir (7a...7e) présentant chacune un cylindre de travail inférieur et un cylindre de travail supérieur (12) et les cylindres de travail (12) formant respectivement une fente de laminage, de sorte que la bande à chaud (11) traverse les fentes de laminage dans la direction de transport (T) lors du laminage de finition et est laminée de façon finie,
    dans lequel, pendant le laminage de finition, au moins une zone côté sortie de la surface d'enveloppe du cylindre de travail inférieur (12) de la dernière cage de laminoir (7e) dans la direction de transport (T) est refroidie par plusieurs buses de refroidissement (14) disposées au-dessous d'une ligne de repérage (P) et les buses de refroidissement (14) projettent un agent de refroidissement liquide sur la surface d'enveloppe,
    le milieu de refroidissement étant maintenu à l'écart de la bande à chaud (11) par au moins un racleur (16) qui est disposé dans la direction verticale entre les buses de refroidissement (14) et la bande à chaud (11), caractérisé en ce que le racleur (16) est fixé à une table de sortie (15) et au moins une buse de nettoyage (17) est prévue pour nettoyer la face supérieure de la table de sortie (15), de sorte que la calamine (Z) et/ou la poussière de laminage sont éliminées.
  2. Train de laminage de finition selon la revendication 1, caractérisé en ce qu'au moins une première buse de nettoyage (17) est disposée du côté entraînement (A) de la cage de laminoir (7e) et au moins une deuxième buse de nettoyage (17) est disposée du côté commande (B) de la cage de laminoir (7e).
  3. Train de laminage de finition selon la revendication 2, caractérisé en ce que la buse de nettoyage (17) du côté entraînement (A) présente un décalage (x) dans la direction de transport par rapport à la buse de nettoyage (17) du côté commande (B).
  4. Train de laminage de finition selon l'une des revendications 1 à 3, caractérisé en ce que, dans la direction de transport (T), entre les cylindres de travail (12) de la dernière cage de laminoir (7e) et une section de refroidissement (8) pour refroidir la bande à chaud laminée finie (11), au moins un rouleau de levage (18), qui est disposé dans la direction de la largeur de la bande à chaud (11), et le rouleau de levage (18) soulève la bande à chaud (11) en direction verticale au-dessus de la ligne de repérage (P) pendant le laminage de finition, de sorte que la face inférieure de la bande à chaud (11) ne touche pas la table de sortie (15).
  5. Train de laminage de finition selon l'une des revendications précédentes, caractérisé en ce qu'une conduite tubulaire ou un tuyau flexible relie de manière fluidique une buse de refroidissement (14) à une buse de nettoyage (17).
  6. Train de laminage de finition (7) pour le laminage de finition d'une bande à chaud (11),
    de préférence en acier,
    le train de laminage de finition (7) présentant plusieurs cages de laminage (7a...7e), les cages de laminage (7a...7e) présentant chacune un cylindre de travail inférieur et un cylindre de travail supérieur (12) et les cylindres de travail (12) formant respectivement une fente de laminage, de sorte que la bande à chaud (11) traverse les fentes de laminage dans la direction de transport (T) lors du laminage de finition et est laminée de façon finie,
    dans lequel, pendant le laminage de finition, au moins une zone côté sortie de la surface d'enveloppe du cylindre de travail inférieur (12) de la dernière cage de laminoir (7e) dans le sens de transport (T) est refroidie par plusieurs buses de refroidissement (14) disposées en dessous d'une ligne de repérage (P) et les buses de refroidissement (14) projettent un agent de refroidissement liquide sur la surface d'enveloppe,
    le milieu de refroidissement étant maintenu à l'écart de la bande à chaud (11) par au moins un racleur (16) qui est disposé dans la direction verticale entre les buses de refroidissement (14) et la bande à chaud (11), caractérisé en ce que le racleur (16) est fixé à une table de sortie (15) et en ce qu'au moins un rouleau de levage (18) est disposé dans la direction de transport (T) entre la dernière cage de laminage (7e) et une ligne de refroidissement (8) pour refroidir la bande à chaud laminée finie (11), qui est disposé dans la direction de la largeur de la bande à chaud (11), et le rouleau de levage (18) peut soulever la bande à chaud (11) en direction verticale au-dessus de la ligne de repérage (P) pendant le laminage de finition, de sorte que la face inférieure de la bande à chaud (11) ne touche pas la table de sortie (15).
  7. Train de laminage de finition selon l'une des revendications précédentes, caractérisé en ce qu'entre le rouleau de levage (18) et un premier groupe de refroidissement (19) de la section de refroidissement (8) est disposée une première unité d'inspection de surface, de préférence optique, pour l'inspection d'une face supérieure de la bande à chaud (11).
  8. Train de laminage de finition selon la revendication 7, caractérisé en ce qu'entre la dernière cage de laminoir (7e) et la première unité d'inspection de surface sont disposés un pyromètre et un premier dispositif de soufflage pour souffler la face supérieure de la bande à chaud (11).
  9. Train de laminage de finition selon l'une des revendications précédentes, caractérisé en ce qu'une deuxième unité d'inspection de surface, de préférence optique, est disposée
    entre un dernier groupe de refroidissement (19) de la section de refroidissement (8) et une cisaille (9) pour inspecter la face inférieure de la bande à chaud (11).
  10. Train de laminage de finition selon la revendication 9, caractérisé en ce qu'entre la deuxième unité d'inspection de surface et la cisaille (9) sont disposés un pyromètre et un deuxième dispositif de soufflage pour souffler la face supérieure de la bande à chaud (11).
  11. Train de laminage de finition selon la revendication 10, caractérisé en ce qu'entre le deuxième dispositif de soufflage et la cisaille (9) est disposée une unité de rouleaux d'entraînement avec au moins un rouleau d'entraînement pouvant être entraîné et pouvant être appliqué contre la bande à chaud.
  12. Train de laminage de finition selon l'une des revendications 9 à 11, caractérisé en ce qu'un régulateur est relié à un entraînement pour soulever le rouleau de levage (18) et la deuxième unité d'inspection de surface pour inspecter la face inférieure de la bande à chaud (11), le régulateur soulevant davantage le rouleau de levage (18) dès que la deuxième unité d'inspection de surface détecte des défauts de surface sur la face inférieure de la bande à chaud.
  13. Installation de coulée et de laminage, comprenant
    une installation de coulée continue (1) pour la coulée continue d'une barre,
    en option, un train de prélaminage (4) pour prélaminer le boudin en une bande intermédiaire,
    éventuellement un four (5), de préférence un four à induction, pour chauffer la bande intermédiaire à la température de laminage, et un train de laminage de finition (7) selon l'une quelconque des revendications précédentes.
  14. Installation composite de coulée et de laminage selon la revendication 13, caractérisée en ce qu'un four tunnel est disposé en amont du train de prélaminage (4) pour chauffer à fond et/ou maintenir la température de la barre.
  15. Installation composite de coulée et de laminage selon la revendication 13 ou 14, caractérisée en ce que le train de prélaminage (4) comprend trois cages de laminoir et le train finisseur (7) cinq cages de laminoir.
EP22151963.0A 2022-01-18 2022-01-18 Réduction des défauts de surface lors du laminage de finition du feuillard à chaud Active EP4212259B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP22151963.0A EP4212259B1 (fr) 2022-01-18 2022-01-18 Réduction des défauts de surface lors du laminage de finition du feuillard à chaud
US18/081,517 US20230226584A1 (en) 2022-01-18 2022-12-14 Reduction of Surface Defects During Finish Rolling of Hot Strip
CN202310049265.XA CN116460140A (zh) 2022-01-18 2023-01-18 在精轧热轧带时减少表面缺陷

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22151963.0A EP4212259B1 (fr) 2022-01-18 2022-01-18 Réduction des défauts de surface lors du laminage de finition du feuillard à chaud

Publications (3)

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EP4212259A1 EP4212259A1 (fr) 2023-07-19
EP4212259B1 true EP4212259B1 (fr) 2024-08-21
EP4212259C0 EP4212259C0 (fr) 2024-08-21

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EP22151963.0A Active EP4212259B1 (fr) 2022-01-18 2022-01-18 Réduction des défauts de surface lors du laminage de finition du feuillard à chaud

Country Status (3)

Country Link
US (1) US20230226584A1 (fr)
EP (1) EP4212259B1 (fr)
CN (1) CN116460140A (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4272976A (en) * 1979-06-05 1981-06-16 Mesta Machine Company Hot strip rolling mill stand
JPH04228217A (ja) * 1990-05-16 1992-08-18 Sumitomo Metal Ind Ltd 熱延鋼帯の搬送方向切換装置と巻取り装置
DE102008019548A1 (de) * 2008-04-18 2009-10-22 Sms Siemag Aktiengesellschaft Auslauf einer Walzanlage
EP3308868B1 (fr) * 2016-10-17 2022-12-07 Primetals Technologies Austria GmbH Refroidissement d'un rouleau d'une cage de laminoir

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Publication number Publication date
CN116460140A (zh) 2023-07-21
EP4212259A1 (fr) 2023-07-19
EP4212259C0 (fr) 2024-08-21
US20230226584A1 (en) 2023-07-20

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