WO2019086192A1 - Installation de coulée continue à réglage de cylindres individuels - Google Patents

Installation de coulée continue à réglage de cylindres individuels Download PDF

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Publication number
WO2019086192A1
WO2019086192A1 PCT/EP2018/076879 EP2018076879W WO2019086192A1 WO 2019086192 A1 WO2019086192 A1 WO 2019086192A1 EP 2018076879 W EP2018076879 W EP 2018076879W WO 2019086192 A1 WO2019086192 A1 WO 2019086192A1
Authority
WO
WIPO (PCT)
Prior art keywords
strand
rollers
reduction
thickness
continuous casting
Prior art date
Application number
PCT/EP2018/076879
Other languages
German (de)
English (en)
Inventor
Thomas Heimann
Uwe Plociennik
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
Priority to US16/758,527 priority Critical patent/US20200254513A1/en
Priority to EP18782420.6A priority patent/EP3703883A1/fr
Publication of WO2019086192A1 publication Critical patent/WO2019086192A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1282—Vertical casting and curving the cast stock to the horizontal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1287—Rolls; Lubricating, cooling or heating rolls while in use
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/14—Plants for continuous casting
    • B22D11/142—Plants for continuous casting for curved casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock
    • B22D11/207—Controlling or regulating processes or operations for removing cast stock responsive to thickness of solidified shell

Definitions

  • the distance between the dip tube and the mold wall must not be too low, so that the liquid metal can circulate in the mold.
  • the dip tube itself must have a minimum diameter so as not to clog too quickly.
  • the cold strand which is used for casting the system of the Outlet side is transported to the mold, a minimum thickness, which can not fall below 40 mm in the rule.
  • the continuous casting plant according to the invention is used for casting a strand in the area of fusion metallurgy, ie a strand of a metal, in particular a metal alloy, preferably steel.
  • the plant is preferably designed as a vertical bending plant, but it can also have a different design.
  • the system can also be designed as a sheet or vertical slab system.
  • the continuous casting plant has a mold, which can be designed as a funnel mold.
  • the mold is adapted to deploy the strand, preferably viewed vertically downwards in the direction of gravity.
  • the mold is to be cast Supplied molten metal and brought from the mold in the desired strand or slab mold by the not yet solidified strand is discharged from a correspondingly shaped outlet opening of the mold.
  • the reduction in thickness in the strand guide can thus lead to an improvement in the reliability when the strand thickness is chosen generously on the mold, without thereby reducing the total thickness reduction at the outlet of the mill. Furthermore, the inner quality of the strand can be improved since the reduction in thickness in the strand guide reduces the flow of liquid melt.
  • the rollers of the strand guide comprise first pairs of rollers immediately adjacent to the mold, and reduction pairs of rollers immediately adjacent to the first pairs of rollers in the direction of conveyance, the rollers of the first pair of rollers not being adjustable, thereby reducing in this area the strand guide, i. an area that adjoins directly to the mold, no reduction in thickness of the strand takes place.
  • the thickness reduction thus according to this preferred embodiment, only "later" after the strand has passed through the first pair of rollers.
  • fluctuations in the mold level can be prevented, and it is prevented that the strand detaches from the mold wall, whereby the reliability is further improved.
  • a good compromise between reliability, compactness and thickness reduction is achieved when the strand guide has two or three first pairs of rolls and eight to fifteen pairs of reduction rolls.
  • the strand guide has a bending region in which the strand is bent.
  • the strand emerges vertically downward from the mold, is guided by the strand guide down and then deflected along an arc.
  • the strand does not have to be bent completely within the strand guide to the horizontal.
  • the remaining bend to the horizontal takes place in the straightening driver.
  • the strand may be transported horizontally to pass through other stations, such as a straightening device, a separator for dividing the strand into slabs of a particular length, an oven and a rolling mill.
  • the strand guide has one or more exchangeable segments, each having a plurality of rollers arranged in pairs.
  • a conventional continuous casting without thickness reduction can be retrofitted in a simple manner with a strand guide of the type described.
  • By replacing one or more segments of a conventional strand guide with one or more segments with engageable roles retrofitting can be modular. So can subsequently by the acquisition of Segments with single roller adjustment lower outlet thicknesses from the strand guide and thereby thinner final dimensions are obtained at the outlet of any rolling mill. If only occasionally thinner final dimensions are to be produced, it is possible to work with several unachievable segments and to install only an adjustable segment (analogous to several adjustable segments) only in the production of the particularly thin dimensions. Alternatively, the engagable segment (analogous to several engagable segments) can always be installed, wherein the engageable roles are driven only in the production of particularly thin dimensions in a reduction position and are otherwise in a zero position without thickness reduction.
  • the engageable rollers are hydraulically, magnetically or by electric motor actuated.
  • the strand guide on one or more hydraulic cylinders, in each of which a piston for adjusting an adjoining engageable roller is hydraulically displaceable.
  • hydraulic control such as by means of oil, the piston between the zero position and the reduction position can be reciprocated. It can be provided adjustable both roles of a pair of rollers or only one role of the pair.
  • engageable roles can be brought in more than two positions, in particular infinitely adjustable.
  • the strand thickness can be reduced to different outlet thicknesses.
  • a frame part of the above-mentioned segment (analogous to a plurality of segments) of the strand guide can be set to be adjustable, whereby a plurality of rollers can be adjusted in groups in order to reduce the strand thickness.
  • the inventive method relates to the casting of a strand by means of a device of the type described above, wherein one or more rollers of the strand guide are employed so that during the regular casting process the thickness of the strand in the strand guide is reduced.
  • the pitch profile of the rollers can be suitably determined depending on the degree of reduction, reduction distance, material of the strand, etc.
  • the decreasing positions of the rollers may be distributed approximately linearly or parabolically, so that the thickness reduction along the strand guide linear or parabolic takes place.
  • the thickness reduction of the strand takes place with not solidified core, which allows energy-saving operation of the system and also contributes to an improvement in the casting quality.
  • the engageable roles are made taking into account process parameters and a temperature calculation model with which temperature properties of the strand, such as the position of the sump tip and / or the strand shell thickness, can be determined.
  • FIG. 1 shows schematically a continuous casting plant, designed as a "vertical bending plant", with two strand guide segments and a straightening device for transporting the cast strand.
  • FIG. 2 shows schematically a continuous casting plant with adjustable rollers.
  • FIGS. 3a and 3b show a hydraulic control of adjustable rollers.
  • roller pairs 24a In order to distinguish different roller groups of the strand guide 2, one or more roller pairs immediately below the mold 1 are referred to as the first roller pairs 24a. Roller pairs that follow in the conveying direction F are referred to as middle roller pairs or reduction roller pairs 24b. The remaining pairs of rollers of the strand guide 2, which lie directly in front of the straightening device 3, are referred to as the last pair of rollers 24 c. Since the rollers 24 of the strand guide 2 are usually arranged in pairs, the reference numerals 24a, 24b, 24c are also used to designate the rollers themselves of the respective pair.
  • the first rollers 24a can not be adjusted, this first roller group preferably having two or three roller pairs 24a.
  • this first roller group preferably having two or three roller pairs 24a.
  • the last pair of rollers 24c preferably about four pairs of rollers, are preferably also adjustable. However, this employment only serves to follow the previously set strand thickness. In this case, no further thickness reduction of the strand S takes place in the section of the last pairs of rollers 24c.
  • Both rollers of a pair of rollers 24b or just one roller 24b of the pair can be adjustably arranged.
  • the adjustment of the rollers 24b, 24c can be technically realized in other ways, such as magnetic or electric motor.
  • the strand thickness can be reduced to different outlet thicknesses.
  • the thickness reduction of the strand S in the strand guide 2 is that the strand thickness at the mold end does not have to be minimized. It has already been stated that the strand may not be arbitrarily thin at the end of the mold for various reasons. Typically, this limit, depending on the material and the process parameters, is about 45 mm. The further the strand thickness at the mold approximates this limit, the greater the risk of breakthroughs. The reduction in thickness in the strand guide 2 can thus lead to an improvement in production safety, if the strand thickness is chosen to be greater on the mold, without thereby reducing the total thickness reduction at the outlet of the rolling mill 7. Furthermore, the inner quality of the strand can be improved because the reduction in thickness in the strand guide 2 reduces the flow of liquid melt, which reduces unwanted segregation.
  • a conventional continuous casting without reduction in thickness in the strand guide 2 can be retrofitted with engageable rollers 24b, 24c.
  • the retrofitting can be modular.
  • subsequent purchase of segments with single roller adjustment lower outlet thicknesses of the strand guide 2 and thereby thinner final dimensions at the outlet of the hot rolling mill 7 can be obtained.
  • the engageable segment 23 (analogous to several engagable segments) can always be installed, wherein the engageable rollers 24b, 24c are driven only in the production of the particularly thin dimensions in the reduction position and are otherwise in the zero position.
  • the engagable reduction rollers 24b of the strand guide 2 then reduce the not yet solidified in the core strand S.
  • the sump tip is the position of the strand S in the transport direction, at which the liquid core, which is still liquid, merges into the solidified area. Since the strand S first solidifies on the surface and the temperature increases from outside to inside, the liquid core in the transporting direction has approximately the shape of a cone, the tip of the cone being called the sump tip.
  • the casting speed and cooling capacity, preferably amount of spray water, are now controlled so that the sump tip shifts forward into the area of the last pair of rollers 24c.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

L'invention concerne une installation de coulée continue qui présente une lingotière (1) pour distribuer une barre de coulée (S) et un corset de guidage (2) jouxtant la lingotière et pourvu de cylindres (24) disposés par paires, pour transporter ladite barre de coulée (S) dans une direction de transport (F), un ou plusieurs des cylindres (24) pouvant être réglés de sorte à permettre une réduction de l'épaisseur de la barre de coulée (S) dans le corset de guidage.
PCT/EP2018/076879 2017-10-30 2018-10-02 Installation de coulée continue à réglage de cylindres individuels WO2019086192A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US16/758,527 US20200254513A1 (en) 2017-10-30 2018-10-02 Continuous casting line having individual roller engagement
EP18782420.6A EP3703883A1 (fr) 2017-10-30 2018-10-02 Installation de coulée continue à réglage de cylindres individuels

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017219464.2A DE102017219464A1 (de) 2017-10-30 2017-10-30 Stranggießanlage mit Einzelrollenanstellung
DE102017219464.2 2017-10-30

Publications (1)

Publication Number Publication Date
WO2019086192A1 true WO2019086192A1 (fr) 2019-05-09

Family

ID=63762532

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/076879 WO2019086192A1 (fr) 2017-10-30 2018-10-02 Installation de coulée continue à réglage de cylindres individuels

Country Status (4)

Country Link
US (1) US20200254513A1 (fr)
EP (1) EP3703883A1 (fr)
DE (1) DE102017219464A1 (fr)
WO (1) WO2019086192A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0350431A2 (fr) * 1988-07-04 1990-01-10 MANNESMANN Aktiengesellschaft Procédé de coulée continue pour la fabrication de brames avec une épaisseur réduite en présence d'état brut de coulée
DE19639302A1 (de) * 1996-09-25 1998-03-26 Schloemann Siemag Ag Verfahren und Vorrichtung zur Erzeugung von dünnen Brammen auf einer Stranggießanlage
US5853043A (en) * 1994-07-29 1998-12-29 Sumitomo Metal Industries, Ltd. Method and apparatus for continuous casting of a thin slab
WO2002090019A1 (fr) * 2001-05-07 2002-11-14 Sms Demag Aktiengesellschaft Procede et dispositif permettant la coulee continue de blocs, de brames ou de brames minces
EP2441538A1 (fr) * 2010-10-12 2012-04-18 Siemens VAI Metals Technologies GmbH Dispositif de coulée continue doté d'une réduction de barre dynamique
DE102015210865A1 (de) 2015-05-06 2016-11-10 Sms Group Gmbh Gieß-Walz-Anlage und Verfahren zu deren Betrieb
DE102015215187A1 (de) 2015-08-10 2017-02-16 Sms Group Gmbh Schmelzmetallurgische Anlage, umfassend eine Kokille

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0350431A2 (fr) * 1988-07-04 1990-01-10 MANNESMANN Aktiengesellschaft Procédé de coulée continue pour la fabrication de brames avec une épaisseur réduite en présence d'état brut de coulée
US5853043A (en) * 1994-07-29 1998-12-29 Sumitomo Metal Industries, Ltd. Method and apparatus for continuous casting of a thin slab
DE19639302A1 (de) * 1996-09-25 1998-03-26 Schloemann Siemag Ag Verfahren und Vorrichtung zur Erzeugung von dünnen Brammen auf einer Stranggießanlage
WO2002090019A1 (fr) * 2001-05-07 2002-11-14 Sms Demag Aktiengesellschaft Procede et dispositif permettant la coulee continue de blocs, de brames ou de brames minces
EP2441538A1 (fr) * 2010-10-12 2012-04-18 Siemens VAI Metals Technologies GmbH Dispositif de coulée continue doté d'une réduction de barre dynamique
DE102015210865A1 (de) 2015-05-06 2016-11-10 Sms Group Gmbh Gieß-Walz-Anlage und Verfahren zu deren Betrieb
DE102015215187A1 (de) 2015-08-10 2017-02-16 Sms Group Gmbh Schmelzmetallurgische Anlage, umfassend eine Kokille

Also Published As

Publication number Publication date
EP3703883A1 (fr) 2020-09-09
DE102017219464A1 (de) 2019-05-02
US20200254513A1 (en) 2020-08-13

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