WO2024115360A1 - Procédé de traitement d'un brin de coulée - Google Patents

Procédé de traitement d'un brin de coulée Download PDF

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Publication number
WO2024115360A1
WO2024115360A1 PCT/EP2023/083120 EP2023083120W WO2024115360A1 WO 2024115360 A1 WO2024115360 A1 WO 2024115360A1 EP 2023083120 W EP2023083120 W EP 2023083120W WO 2024115360 A1 WO2024115360 A1 WO 2024115360A1
Authority
WO
WIPO (PCT)
Prior art keywords
width
cast strand
rolling
upsetting
strand
Prior art date
Application number
PCT/EP2023/083120
Other languages
German (de)
English (en)
Inventor
Michael Breuer
Thomas Daube
Original Assignee
Sms Group Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sms Group Gmbh filed Critical Sms Group Gmbh
Publication of WO2024115360A1 publication Critical patent/WO2024115360A1/fr

Links

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
    • B21B1/224—Edge rolling of flat products
    • 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
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/06—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged vertically, e.g. edgers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0007—Cutting or shearing the product
    • B21B2015/0014—Cutting or shearing the product transversely to the rolling direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2201/00—Special rolling modes
    • B21B2201/14—Soft reduction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/02—Transverse dimensions
    • B21B2261/06—Width

Definitions

  • the invention relates to a method for processing a cast strand with the aid of an upsetting device.
  • the back spreading is often undefined in the current state of the art, which in turn leads to undesirable problems when threading the cast strand into downstream hot rolling stands.
  • the invention is based on the object of developing a known method for processing, in particular for upsetting, a cast strand made of metal in such a way that a desired target width is achieved for the cast strand after flat rolling.
  • the method according to the invention advantageously ensures that the width of the cast strand after upsetting and subsequent flat rolling is not arbitrary or random, but rather that the cast strand then has exactly the desired target width W2. According to the invention, this is ensured by taking into account, on the one hand, the constancy of the mass flow and, on the other hand, the re-spreading of the cast strand through the horizontal rolling stand when dimensioning the extent of upsetting.
  • Upsetting the cast strand using the upsetting device enables a decoupling of the casting width WO and the rolling width W2, because upsetting allows an intermediate width W1 to be set in the cast strand so that the desired target width W2 is later achieved. Upsetting also allows optimization of the throughput or production output of, for example, a casting and rolling plant and improves its process reliability.
  • flat rolling primarily refers to the levelling of edge areas of the cast strand, which are increased by compression compared to the centre of the cast strand.
  • extent of compression means the size, strength or degree of compression.
  • the term "constancy of mass flow” refers to the adjustment of the material throughput at the various units in question, which is necessary due to the direct coupling of the continuous casting in the casting machine with the downstream rolling stands, in this case the upsetting device and the horizontal rolling stand.
  • the coupling is made possible by the endless casting strand, which is not severed between the outlet of the casting machine and the upsetting device.
  • the casting machine works advantageously with a constant casting speed in order to keep the essential parameters during casting operation, such as oscillation of the mold, strand cooling in the strand guide of the casting machine and speed of the strand guide rollers in the strand guide, as constant as possible.
  • the upsetting device and the horizontal rolling stand are equipped with very powerful drive motors that could have a direct effect on the casting speed if the mass flows in the casting machine and the said rolling stands were to deviate from one another. These repercussions due to unadjusted mass flow at the rolling stands usually lead to surface defects on the cast strand and can even lead to breakages in the cast strand in the solidification area.
  • Both the upsetting device and the horizontal stand for flat rolling influence the cross-sectional area of the cast strand at the exit of the respective rolling stand. This change in cross-sectional area is directly reflected in the mass flow.
  • the rolling stands are equipped with adjustable main drives, which essentially perform the forming work.
  • the mass flow is adjusted by a suitable selection of the roll speed on the rolling stands.
  • it is therefore essential to adapt the rolling speed and thus the roll speeds of the rolling stands to the initial width of the cast strand WO and, if necessary, also when the width of the cast strand changes.
  • the description includes eight figures, of which
  • Figure 1 shows the method according to the invention using the example of a
  • Figure 2 shows the differences in the profile of a cast strand with different degrees of compression
  • Figures 4 I) to 4IV) show the upsetting process according to the invention when a width wedge occurs in the cast strand, which tapers over time, at different points in time I), II), III) and IV) in a plan view of the cast strand;
  • Figure 5 in an upper figure the change of parameters
  • Figures 6 I) to 6 IV) show the upsetting process according to the invention when a width wedge occurs in the cast strand, which widens over time, at different times I), II), III) and IV) in a plan view of the cast strand;
  • Fig. 7 the change in the width W1 of the cast strand behind the upsetting device at the different times I), II), III) and IV);
  • Figure 1 illustrates the method according to the invention, in which a cast strand 20 is first compressed after it emerges from a casting machine 200.
  • the cast strand is produced in the casting machine 200 by filling liquid metal into a mold, not shown in Figure 1, and subsequently pulling the cast strand 20 out of the mold.
  • the compression of the cast strand 20 is carried out with the aid of a compression device 12, which compresses the cast strand from its initial width WO to a smaller intermediate width W1.
  • the upsetting device 12 can be either an upsetting press or a vertical rolling stand with rollers, which are shown symbolically for the entire upsetting device 12 in Figure 1.
  • the cast strand 20 Before entering the upsetting device 12, the cast strand 20 has the rectangular profile shown with the said initial width WO and the height HO.
  • the material of the cast strand 20 is displaced in the width direction, particularly at its edges, and the material therefore moves upwards and downwards at the edges of the cast strand.
  • the height H1 is typically significantly greater than the original height or thickness of the cast strand HO.
  • the width of the cast strand is reduced from WO to W1.
  • the dog bone profile shown is, as mentioned, unfavourable for the entry into a downstream hot strip mill 300. Therefore, the compressed cast strand 20 is flat-rolled before it enters the hot rolling mill using a flat rolling stand or horizontal rolling stand 14. In particular, the edges of the cast strand 20 are levelled so that the cast strand again has a desired rectangular profile after flat rolling, this time with the target width W2 and the height or thickness H2. The following relationship applies:
  • W2>W1 (I) i.e., the cast strand widens back - particularly in a state where there is largely no tensile stress. At high tensile stress, the width of the cast strand can also be reduced. However, this case is not the subject of the invention. Because according to the invention the upsetting of the cast strand 20, ie the intermediate width W1 realized by the upsetting, takes into account the constancy of the mass flow and the back spreading during horizontal rolling, it can be ensured that the resulting width W2 of the cast strand 20 downstream of the horizontal rolling stand 14 is not arbitrary, but corresponds to a desired target width W2.
  • Fig. 2 illustrates the effects of different degrees of compression on the re-expansion of the cast strand.
  • the cast strand 20 after compression initially has the profile shown at the top left with the width W1 (1 ) and the height H1 (1 ). After the subsequent flat rolling, this results in the profile of the cast strand 20 shown below with the new width W2 (1 ) and the height H2 (1 ).
  • the following relationships apply:
  • W2 (1 ) is greater than W1 (1 ) and H2 (1 ) is smaller than H1 (1 ) (III)
  • Fig. 2 shows the same cast strand 20, but in the second embodiment shown here (2) it was assumed that it was compressed more strongly in the compression device 12 than in the first embodiment (1). This results in the dog bone profile shown with the width W1 (2) and H1 (2). In comparison to the first embodiment (1), the following applies:
  • Fig. 3 illustrates in its upper illustration the relationship between the so-called compression dimension W0-W1, realized in the compression device 12, in which the width of the cast strand is reduced from the width WO to the width W1, and the achieved width reduction of the cast strand after the flat pass W0-W2 no flat rolling.
  • the cast strand in the horizontal rolling stand 14 typically experiences a widening to the initial width W2; see also Fig. 1.
  • the width W2 is, however, typically still smaller than the initial width WO, which is why above we refer to a width reduction of the cast strand after the flat pass W0-W2.
  • the following regressed relationship was determined from operational measurement data. The following applies:
  • CO, C1 are constant at an operating point, but they are dependent on the initial width of the cast strand WO when leaving the casting machine, the thickness of the cast strand and/or the material from which the cast strand is made, and must be adjusted in order to cover a large geometry spectrum for the cast strand.
  • operating point is meant that the regression found is applicable within a range of +/- 10% of the sizes WO and the thickness of the cast strand 20.
  • Co and C1 are always ⁇ 1 .
  • Formula (VIII) states the following with reference to Fig. 1: In order to ensure that - taking into account the constancy of the mass flow and the back spreading through the horizontal rolling stand 14 - the desired/specified constant target width W2 is established downstream of the horizontal rolling stand 14, the cast strand 20 must be compressed to the width W1 depending on its initial width WO using the compression device 12. According to formula (VIII), the required compression width W1 of the cast strand 20 after it has been compressed - at least approximately - is to be selected inversely proportional to the initial width or casting width WO of the cast strand, ie: the larger the casting width Wo, the smaller the compression width W1 must be selected in order to achieve the target width W2.
  • Figures 1 to 3 illustrate the upsetting process according to the invention with a constant casting width WO of the cast strand when leaving the casting machine 200
  • Figures 4 to 6 show the upsetting process according to the invention with a change in the casting width of the cast strand 20 when leaving the casting machine 200, ie with the presence of a width wedge 22 in the cast strand 20 before reaching the upsetting device 12.
  • Fig. 4 shows an endless cast strand 20, the width of which changed during its production in the mold of the casting machine 200, and in this example was reduced over time. This change results in a width wedge 22 and is referred to below as A WO.
  • Figures 4 and 5 serve to illustrate the upsetting process according to the invention in the case of the said variable cast strand width WO.
  • Figure 4 shows a plan view of the rolling mill in the area of the stand group, upsetting device 12 and horizontal rolling stand 14, at different points in time, which are designated I), II), III) and IV).
  • a WO WO - WOnew Width change of the cast strand in the casting machine
  • AW1 W1 - W1 new Width change of the cast strand in the upsetting device
  • Formula (IX) results when formula (VIII) is considered for differential values, specifically for changes in the initial width AWO.
  • Formula (IX) describes how the upsetting width W1 must be changed in the event of a change in WO, i.e. in the case of a width wedge 22 - taking into account the constancy of the mass flow and the back-spreading through the horizontal rolling stand 14 - in order to ensure that the desired/specified constant target width W2 is established downstream of the horizontal rolling stand 14.
  • the upper illustration in Figure 5 shows the basic temporal progression, i.e. the changes in the widths WO, W1 and W2 of the cast strand 20 according to Fig. 4 as it passes through the upsetting device 12 and the horizontal rolling stand 14.
  • the upsetting width must be increased from W1 to W1new at a later time in order to keep the target width W2 at the exit of the horizontal rolling stand 14 constant over time.
  • FIG. 5 shows the temporally parallel progression of the speeds of the work rolls on the vertical stand n_VS and on the horizontal stand n_HS for maintaining the constant mass flow.
  • the necessary corrections are applied to the adjustment systems of the rolling stands 12 and 14 and carried out in a timely and location-appropriate manner.
  • the speeds of the drives of the rollers of the rolling stands 12 and 14 must be set in their speeds according to Fig. 5 depending on the cross-sectional changes of the cast strand 10 specified by the width wedge in the different time phases I), II), III) and IV) in order to be able to keep the mass flow impressed by the casting machine 200 constant.
  • the roller speeds of the vertical and horizontal stands are designated n_VS and n_H.
  • Figures 6 I) to 6 IV) relate to the opposite case to Figures 4 and 5: If the original starting width WO of the cast strand 20 with the width wedge 22 increases over time to a new starting width WOnew, then the extent of the compression must be reduced from the original intermediate width W1 to the smaller new intermediate width W1new.
  • Fig. 7 illustrates the change of W1 over the different points in time I), II), III) and IV) according to Fig. 6. Conversely to Figure 5, upper figure, in Fig.
  • the upsetting width W1 must be reduced, starting from the time t1 when the width wedge 22 enters the upsetting device 12.
  • Fig. 8 relates to the case where the cast strand 20 has a predetermined separation point 24, marked in Fig. 8 with a thick dash-dot horizontal line.
  • individual slabs 26 are later separated from the initially endless cast strand 20, ie downstream of the horizontal rolling stand 14.
  • the slabs 26 are later finish-rolled in the subsequent hot rolling or finishing mill 300; see Fig. 1 .
  • the head of the remaining endless cast strand and, at the same time, the foot of the separated slab 26 are created. The head and the foot are each free ends of the cast strand or the slab.
  • the method according to the invention provides the following preventive measures:
  • Fig. 8 shows the time sequence when the stand group, upsetting device 12 and horizontal rolling stand 14, passes through the intended separation point 24.
  • the separation can be used to set a new strip width W2new.
  • Figures I) to V) in Fig. 8 show the time sequence: I)
  • the casting process runs with, for example, a constant initial width WO of the cast strand 20.
  • the previous width of the cast strand 20 after compression is W1 with a constant initial width WO or W1 new with a non-constant width; see the description of the width wedge 22 above.
  • the intended separation point 24 runs into the upsetting device 12.
  • the upsetting device is moved further to the position W1 ' or WTneu with W1 ' ⁇ W1 or WTneu ⁇ W1 neu. This means: Compared to the upsetting width W1 or W1 neu already achieved, the cast strand 20 is further upset locally at the separation point 24 to the width W1 ' or W1 'neu.
  • a locally limited additional width reduction occurs.
  • the upsetting device 12 moves a little further to a new upsetting width W1".
  • the width W1" can correspond to the previous upsetting width W1 or W1 new, or it can also deviate from it, i.e. be larger or smaller.
  • the width W2" is created downstream of it by re-widening.
  • the return to the width W1" can, but does not have to, be used to set a new desired width W2" downstream of the horizontal rolling stand 14.
  • the slab 26 is separated from the cast strand 20 at the narrowest point with the width WT or WTneu, i.e. at the marked separation point 24.
  • roller speeds must be corrected in order to maintain the constant mass flow when the upsetting device 12 is in Form of a vertical rolling stand.
  • the roll speeds must be increased briefly and then adjusted to a new setting value.
  • a suitable tracking of the intended separation point 24 is necessary in order to control the individual actuators, i.e. in particular the adjusting device on the roll stands for changing the roll gap and the speed of the rolls, in a timely and location-appropriate manner and to carry out the corrections and to hit the intended separation point 24 during the cut.
  • the setting of the upsetting device 12 in step II) in Fig. 8 is carried out in a jerky manner with an immediately subsequent re-opening of the upsetting device 12 to the width W1".
  • a notch with a notch depth D or D' is created in the edge areas on both sides of the cast strand 20 at the level of the separation point 24.
  • the notch depth D as half the difference between the intermediate width W1 and the smaller intermediate width WT is as follows:
  • the described embodiments can be combined by superposition, depending on the production situation, and thus allow an adjustment of the desired strip width W2 during rolling.
  • the upsetting of the cast strand 20 by the upsetting device 12 enables a decoupling of the casting width WO and the rolling width W2, because the upsetting creates such an intermediate width W1 at the cast strand can be adjusted so that the desired target width W2 is achieved later.
  • Upsetting also allows optimization of the throughput or production output, e.g. of a casting and rolling plant, and improves its process reliability.

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

Abstract

L'invention concerne un procédé de traitement d'un brin de coulée métallique, en particulier d'acier, comprenant les étapes suivantes consistant à : couler du métal liquide dans une matrice dans une machine de coulée pour créer le brin coulé sans fin (20) avec une largeur de départ (W0) ; comprimer le brin coulé (20) au moyen d'un dispositif de compression (12) de la largeur de départ (W0) à une largeur intermédiaire plus petite (W1) ; et laminer à plat le brin coulé (20) au moyen d'un support de laminage horizontal (14), la distribution d'épaisseur du brin coulé (20) sur sa largeur étant uniformisée après l'opération de compression, et la largeur du brin coulé (20) étant augmentée de la largeur intermédiaire (W1) à une largeur (W2) après l'opération de laminage à plat. Afin d'obtenir une largeur cible souhaitée (W2) pour le brin coulé (20) après l'opération de laminage à plat dans ce procédé connu, le procédé prévoit également que la compression du brin coulé (20) est effectuée sur une largeur intermédiaire (W1) telle que la largeur cible souhaitée (W2) est obtenue en tant que largeur du brin coulé (20) en aval du support de laminage horizontal (14) après l'opération de laminage à plat tout en tenant compte de la constance du débit massique et de l'effet d'élargissement provoqué par le support de laminage horizontal (14).
PCT/EP2023/083120 2022-11-30 2023-11-27 Procédé de traitement d'un brin de coulée WO2024115360A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022212909.1 2022-11-30
DE102022212909.1A DE102022212909A1 (de) 2022-11-30 2022-11-30 Verfahren zum Bearbeiten eines Gießstrangs

Publications (1)

Publication Number Publication Date
WO2024115360A1 true WO2024115360A1 (fr) 2024-06-06

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ID=88975763

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Application Number Title Priority Date Filing Date
PCT/EP2023/083120 WO2024115360A1 (fr) 2022-11-30 2023-11-27 Procédé de traitement d'un brin de coulée

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DE (1) DE102022212909A1 (fr)
WO (1) WO2024115360A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3225313A1 (de) * 1982-07-07 1984-01-12 SMS Schloemann-Siemag AG, 4000 Düsseldorf Verfahren zum walzen von breitbandvormaterial
US4532789A (en) * 1980-02-28 1985-08-06 Estel Hoogovens B.V. Process for reducing the width of a flat metal product by rolling
EP0925850A2 (fr) 1997-12-23 1999-06-30 Sms Schloemann-Siemag Aktiengesellschaft Procédé de laminage pour une bande métallique
DE19746876C2 (de) * 1997-10-23 2003-03-27 Sms Demag Ag Verfahren und Vorrichtung zur Erzeugung von schmalem Warmband unterschiedlicher Breiten aus Dünnbrammen
DE102021204174A1 (de) * 2021-04-27 2022-10-27 Sms Group Gmbh Verbesserung der Produktqualität durch Berücksichtigung alternativer Produktauswahl

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4532789A (en) * 1980-02-28 1985-08-06 Estel Hoogovens B.V. Process for reducing the width of a flat metal product by rolling
DE3225313A1 (de) * 1982-07-07 1984-01-12 SMS Schloemann-Siemag AG, 4000 Düsseldorf Verfahren zum walzen von breitbandvormaterial
DE19746876C2 (de) * 1997-10-23 2003-03-27 Sms Demag Ag Verfahren und Vorrichtung zur Erzeugung von schmalem Warmband unterschiedlicher Breiten aus Dünnbrammen
EP0925850A2 (fr) 1997-12-23 1999-06-30 Sms Schloemann-Siemag Aktiengesellschaft Procédé de laminage pour une bande métallique
DE102021204174A1 (de) * 2021-04-27 2022-10-27 Sms Group Gmbh Verbesserung der Produktqualität durch Berücksichtigung alternativer Produktauswahl

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