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EP0850701B1 - Procédé et installation de production de barres avec une structure affinée et/ou compressée par forgeage au laminoir - Google Patents

Procédé et installation de production de barres avec une structure affinée et/ou compressée par forgeage au laminoir Download PDF

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Publication number
EP0850701B1
EP0850701B1 EP97122109A EP97122109A EP0850701B1 EP 0850701 B1 EP0850701 B1 EP 0850701B1 EP 97122109 A EP97122109 A EP 97122109A EP 97122109 A EP97122109 A EP 97122109A EP 0850701 B1 EP0850701 B1 EP 0850701B1
Authority
EP
European Patent Office
Prior art keywords
stand
rolling
forging
roll
roll stand
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.)
Expired - Lifetime
Application number
EP97122109A
Other languages
German (de)
English (en)
Other versions
EP0850701A1 (fr
Inventor
Hubert Müller
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.)
SMS Siemag AG
Original Assignee
SMS Demag AG
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 Demag AG filed Critical SMS Demag AG
Publication of EP0850701A1 publication Critical patent/EP0850701A1/fr
Application granted granted Critical
Publication of EP0850701B1 publication Critical patent/EP0850701B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B21B1/46—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
    • B21B1/466—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 non-continuous process, i.e. the cast 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
    • B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
    • B21B1/026—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
    • B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
    • B21B1/04—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing in a continuous process
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49988—Metal casting
    • Y10T29/49991—Combined with rolling

Definitions

  • the invention relates to a method for producing bar steel with refined and / or compacted structure.
  • the invention also relates to a rolling mill system to carry out the procedure.
  • JP-A-5-337510 discloses the closest prior art a process for the production of steel bars with refined and / or compacted Structure. However, no continuously cast long goods are used, and nor are billets with an approximately square cross-section and beveled Corner areas.
  • the invention is based on the object of specifying a method and a system, with which the production of a core-compacted product is compared for forging much higher productivity and consequently greatly reduced Costs succeed, while the overall benefits of rolling in quality improvement from steel through forging to an economical-technical one Unite overall success.
  • the problem is solved with a method for producing steel bars with a refined and / or condensed structure by combining them coordinated work steps according to claim 1.
  • the structure is refined in the manner of a deep kneading process and compacted, and thus the mechanical properties of the so treated Stahls significantly improved.
  • the method according to the invention before forming also known as forging rolling, by rolling down of corner areas of the billets in at least one four-roll stand with so high rolling force ensures that the resulting and recognizable, for example, in the micrograph Compression compressive stresses are effective down to the core zone.
  • the method further provides that after the cast strand has solidified, the billets Temperature compensation and heating to a designated forging roll temperature pre-calibrated and the flanks of the billets are deformed concavely.
  • the the resulting cross-sectional shape of the billets guarantees that that the compression pressures generate compressive stresses down to the core and create a relatively even structure across the entire cross-section.
  • the invention advantageous, depending on the rolling temperature on the inlet side of a scaffolding, an increase in temperature, preferably by induction heating to make.
  • An advantageous embodiment of the invention provides that the pre-calibrated Billets are preferred in a combination of horizontal roll stand and vertical roll stand smoothed and then immediately into the four-roll stands introduced and deformed therein by forging rollers.
  • the invention enables that according to the degree to be achieved Structural compaction Forming of the rolling stock by immediately following one another Stitches in a sequence of two-roll stands and four-roll stands be made.
  • the determination of whether a wire with sufficient structural compaction up to the core zone can be reached by a series of tests on rolled specimens, especially after they have cooled down by micrographs determine and reproduce safely with the experience gained.
  • At least one four-roll stand with four can be used for forging rolls driven rollers are used. With corresponding requirements other rolling parameters may also suffice for forging at least one four-roll stand with two driven rolls used is, for example. With two driven horizontal rollers and two non-driven Vertical rolling.
  • the billet at least for the first stitch for rolling down the corner areas in one Two-roll stand or in a four-roll stand in a diagonal position below 45 ° are brought.
  • the advantage here is that a maximum amount of deformation work realized with a relatively small elongation of the rolled product becomes.
  • This advantage can still be used to a greater extent by the fact that Sticks are turned 45 ° for each subsequent stitch.
  • the smoothing stitch in the two-roll horizontal stand or in the two-roll vertical stand is approximately 10%, whereas the forging rolling in the four-roll stand with one pass reduction from 30 - 60%.
  • the method according to the invention provides with great advantage that Continuous casting billets in the roughing train of a rolling mill to produce steel bars processed by forged rollers and / or compacted structure and that the hot rolled steel bar immediately afterwards in an intermediate or finishing train of the rolling mill system to a calibrated or profiled Finished product is rolled.
  • Figure 1 shows the cross section of a as a starting material for manufacturing of steel bars with and refined by forging rolls compacted structure of continuously cast billet 20. It has one approximately square cross section with the vertical plane y-y and the horizontal plane x-x. At an angle of 45 ° between them Layers shows the cross-sectional shape of strongly sloping corner areas and initially even flanks 22.
  • a temperature compensation for example, in a conventional manner Equalization furnace (not shown) and the strand with a pair of scissors 11 cut into individual billets.
  • the Sticks pre-calibrated, smoothed and their flanks 22 accordingly the representation in Fig.
  • FIG. 2 the Stick 20 rotated by 45 ° and, for example, in a first stitch another sequence of steps between a pair of horizontal rollers 4 Rolling down the corner regions 21 in a first compression step subjected.
  • the resulting compression zones in the structure are indicated by the reference number 30 in FIG.
  • This illustration also clearly shows the concave shape 23 of the prepared for the billet cross sections.
  • Figure 2 shows the preparation of the next forming stitch in a universal scaffold 5, 7 of FIG Vertical rolls 14.
  • FIG. 3 shows an example of a family tree Carrying out the process suitable rolling mill system.
  • she owns an upstream system unit 1 in the form of a continuous casting system for the production of continuous cast and for forging rolling thermally prepared billet 20 made from the endless cast strand 10 can be cut to length with scissors 11.
  • the facility also shows in a preparatory part a roughing stand 2 for pre-calibration and then for smoothing a duo-horizontal frame 3 with subordinate Vertical smoothing scaffold 4.
  • Essential elements for that Forging rolls are the following two universal stands 5 and 7 preferably with smooth cylindrical rollers, between which there are a device 6 for preferably inductively heating the billets 20 is located. This can be followed by a duo frame 8 for smoothing his.
  • FIG. 3 further shows, there is one in the system of the Vorstrasse 15 Finishing line 9, not specifically identified, with, for example, five finishing stands subordinate.
  • the core is compacted into these by forging rolls Steel bars introduced hot and rolled in a heat.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Forging (AREA)
  • Heat Treatment Of Steel (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)

Claims (15)

  1. Procédé pour la production d'acier en barres avec une structure plus fine et/ou compactée, présentant les étapes :
    a) on utilise comme matériau de départ des produits longitudinaux coulés en continu sous forme de billettes (10) de qualité d'acier forgeable présentant une section quasiment carrée et des coins (21) coupés
    b) après solidification du produit coulé (10), équilibrage de la température et chauffage à la température de forgeage, les billettes (20) sont d'abord précalibrées, et les flancs (21) de la billette étant en l'occurrence déformés de manière concave (23),
    c) on procède à une augmentation de la température de laminage nécessaire en fonction de la température du produit laminé du côté de l'entrée d'une cage (7), de préférence avec des moyens (6) pour un chauffage par induction, et
    d) les billettes précalibrées et chauffées à la température de laminage de forgeage, supérieure à la température de transformation, sont soumises à un processus de déformation en plusieurs étapes par une déformation continue sans torsion au moyen de passes directement consécutives dans à chaque fois une succession de cages duo et quarto (3, 4, 5, 7, 8) avec un faible allongement par laminage de forgeage en produit laminé à noyau compacté, avec une force de laminage tellement élevée que les contraintes de compression et de compactage (30) qui se forment et par exemple observables en micrographie agissent jusque dans la zone centrale.
  2. Procédé selon la revendication 1, caractérisé en ce que les billettes (20) sont tournées de 45° avant chaque passe consécutive.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'il est réalisé sur un produit laminé d'au maximum 480 cm2 correspondant par exemple à une section carrée présentant un côté d'environ 22 cm et sur un acier de traitement non allié ou faiblement allié présentant une teneur en C de 0,1 à 0,3 %.
  4. Procédé selon l'une ou plusieurs des revendications 1 à 3, caractérisé en ce que les billettes précalibrées (20) sont de préférence lissées dans une combinaison d'une cage de laminage horizontale (13) et/ou une cage de laminage verticale (4) et en ce qu'elles sont introduites de manière directement consécutive dans la ou les cages quarto (5, 7) puis déformées par laminage de forgeage.
  5. Procédé selon l'une ou plusieurs des revendications 1 à 4, caractérisé en ce qu'en fonction du taux de compactage de structure à atteindre, les déformations du produit laminé sont réalisées par des passes immédiatement consécutives dans à chaque fois une succession de cages duo et quarto (3, 4, 5, 7, 8).
  6. Procédé selon l'une ou plusieurs des revendications 1 à 5, caractérisé en ce que le laminage de forgeage est réalisé en utilisant des cages de laminage (5, 7) comparativement très résistantes à la flexion, présentant de préférence des cylindres cylindriques (4, 14) présentant un diamètre comparativement faible.
  7. Procédé selon l'une ou plusieurs des revendications 1 à 6, caractérisé en ce qu'on utilise pour le laminage de forgeage au moins une cage quarto (5, 7) présentant quatre cylindres entraínés (4, 14).
  8. Procédé selon l'une ou plusieurs des revendications 1 à 7, caractérisé en ce que qu'on utilise pour le laminage de forgeage au moins une cage quarto (5, 7) présentant deux cylindres entraínés (4 ou 14), par exemple deux cylindres horizontaux entraínés et deux cylindres verticaux non entraínés.
  9. Procédé selon l'une ou plusieurs des revendications 1 à 8, caractérisé en ce que les billettes (20) sont placées dans une position diagonale de 45°, au moins lors de la première passe pour le laminage des coins (21) dans une cage duo (3, 4) ou quarto (5, 7).
  10. Procédé selon l'une ou plusieurs des revendications 1 à 9, caractérisé en ce que la passe de lissage dans une cage duo horizontale ou dans une cage duo verticale est d'environ 10 % et en ce que le laminage de forgeage est réalisé dans la cage quarto avec une réduction par passe de 30 % à 60 %.
  11. Procédé selon l'une ou plusieurs des revendications 1 à 10, caractérisé en ce que la billette coulée en continu (20) est transformée dans un train dégrossisseur (15) d'une installation de laminage en acier en barre présentant une structure (30) plus fine et/ou compactée réalisée par laminage de forgeage et en ce que l'acier en barres chaud est laminé de manière immédiatement consécutive dans un train intermédiaire ou finisseur (9) de l'installation de laminage en un produit fini calibré ou profilé.
  12. Installation de laminage présentant une partie d'installation pour la production d'acier en barres présentant une structure (30) plus fine et/ou compacte pour la réalisation du procédé selon les revendications 1 à 11, caractérisée en ce que la partie d'installation pour la production d'acier en barres laminé par forgeage est un train dégrossisseur (15) qui présente les moyens de déformation suivants :
    au moins un bloc (2) à deux cages pour le précalibrage de produits longitudinaux coulés en continu, tels que des billettes coulées,
    au moins une cage duo horizontale (4) ou une cage duo verticale (3) pour le lissage de la surface de la billette à déformer et/ou
    au moins une cage quarto (5, 7) avec des moyens pour guider et tourner les billettes (20)
    des moyens (6) pour le chauffage intermédiaire des billettes (20), de préférence par induction.
  13. Installation de laminage selon la revendication 12, caractérisée en ce que le train dégrossisseur est suivi immédiatement d'un train intermédiaire ou finisseur (9).
  14. Installation de laminage selon la revendication 12 ou 13, caractérisée en ce que le train dégrossisseur (15) est précédé d'une installation de coulée pour la production par coulée continue de produits longitudinaux thermiquement préparés pour le laminage de forgeage, tels que par exemple des billettes.
  15. Installation de laminage selon la revendication 13 ou 14, caractérisé en ce que la cage duo (3, 4) est une cage duo horizontale usuelle ou une cage duo verticale usuelle et en ce que la cage quarto est une cage universelle, à chaque fois équipée de cylindres lisses.
EP97122109A 1996-12-23 1997-12-16 Procédé et installation de production de barres avec une structure affinée et/ou compressée par forgeage au laminoir Expired - Lifetime EP0850701B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19654063 1996-12-23
DE19654063A DE19654063A1 (de) 1996-12-23 1996-12-23 Verfahren und Anlage zur Herstellung von Stabstahl mit durch Schmiedewalzen verfeinertem und/oder verdichtetem Gefüge

Publications (2)

Publication Number Publication Date
EP0850701A1 EP0850701A1 (fr) 1998-07-01
EP0850701B1 true EP0850701B1 (fr) 2001-11-28

Family

ID=7816045

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97122109A Expired - Lifetime EP0850701B1 (fr) 1996-12-23 1997-12-16 Procédé et installation de production de barres avec une structure affinée et/ou compressée par forgeage au laminoir

Country Status (5)

Country Link
US (1) US5983481A (fr)
EP (1) EP0850701B1 (fr)
JP (1) JPH10211501A (fr)
AT (1) ATE209536T1 (fr)
DE (2) DE19654063A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1400913B1 (it) * 2010-06-24 2013-07-02 Danieli Off Mecc Procedimento e impianto di colata e laminazione per realizzare prodotti laminati metallici lunghi
WO2016027208A1 (fr) 2014-08-18 2016-02-25 Bharat Forge Limited Procédé de forgeage de pièces complexes à partir de billettes de coulée continue
KR102348556B1 (ko) 2018-11-27 2022-01-06 주식회사 포스코 롤 포징 장치
IT202000020434A1 (it) * 2020-08-26 2022-02-26 Danieli Off Mecc Processo e apparato per produrre prodotti siderurgici, in particolare di tipo merchant, in particolare in modalita’ endless
CN113231463A (zh) * 2021-06-24 2021-08-10 西安盛日机电科技有限公司 无孔型技术轧制高速棒材的工艺方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB456478A (en) * 1935-02-21 1936-11-10 Ver Stahlwerke Ag Process for improving the structure of steel products
DE2014878B2 (de) * 1970-04-01 1975-04-10 Wsesojusnij Nautschno-Issledowatelskij I Projektno-Konstruktorskij Institut Metallurgitscheskowo Maschinostrojenija Moskau Verfahren zum Walzen von gegossenem Metallgut mit gerader Zahl von Begrenzungsflächen
JPS5581004A (en) * 1978-12-12 1980-06-18 Nippon Steel Corp Forming roll
DE3816840A1 (de) * 1988-05-18 1989-11-30 Schloemann Siemag Ag Kalibrierung fuer die walzen von walzgeruesten mit drei oder mehr walzen
SU1623805A1 (ru) * 1989-03-15 1991-01-30 Производственное объединение "Уралмаш" Способ прокатки заготовок
JPH04327301A (ja) * 1991-04-30 1992-11-16 Nkk Corp ビレットの圧延方法
JPH05337510A (ja) * 1992-06-10 1993-12-21 Daido Steel Co Ltd 圧延方法
JP2854811B2 (ja) * 1994-12-24 1999-02-10 住友重機械工業株式会社 インライン型鋼材生産設備

Also Published As

Publication number Publication date
DE59705539D1 (de) 2002-01-10
DE19654063A1 (de) 1998-06-25
ATE209536T1 (de) 2001-12-15
JPH10211501A (ja) 1998-08-11
EP0850701A1 (fr) 1998-07-01
US5983481A (en) 1999-11-16

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