EP0741618A1 - Guide system for continuously cast metal - Google Patents

Guide system for continuously cast metal

Info

Publication number
EP0741618A1
EP0741618A1 EP95906267A EP95906267A EP0741618A1 EP 0741618 A1 EP0741618 A1 EP 0741618A1 EP 95906267 A EP95906267 A EP 95906267A EP 95906267 A EP95906267 A EP 95906267A EP 0741618 A1 EP0741618 A1 EP 0741618A1
Authority
EP
European Patent Office
Prior art keywords
strand
guide frame
rectangular
pct
width
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.)
Granted
Application number
EP95906267A
Other languages
German (de)
French (fr)
Other versions
EP0741618B1 (en
Inventor
Fritz-Peter Pleschiutschnigg
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
Mannesmann 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 Mannesmann AG filed Critical Mannesmann AG
Publication of EP0741618A1 publication Critical patent/EP0741618A1/en
Application granted granted Critical
Publication of EP0741618B1 publication Critical patent/EP0741618B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1287—Rolls; Lubricating, cooling or heating rolls while in use

Definitions

  • the invention relates to a strand guide frame, with which a swinging of the cast strand is prevented.
  • strand guide stands are known in which the rollers have curved straight surface lines instead of straight ones. Such rolls are always used when the mold exit cross section creates a strand cross section that deviates significantly from the rectangular shape.
  • rolls with straight surface lines are generally used in the strand guiding structure directly under the continuous casting coconut (segment 0), the surface lines being parallel to one another in pairs.
  • the casting speed is limited by the pendulum or fluttering of the strands, the following values usually being used:
  • the object of the invention is to provide rollers for the strand guide frames for rectangular strands, in which the rollers are designed in such a way that oscillation or fluttering of the strands is prevented.
  • the object is achieved by the features of claim 1.
  • the subclaims contain advantageous refinements. It has been shown that when using continuous casting molds with a rectangular cross-section and cylindrical guide rails. and this is in the case of the majority of all continuous casting plants currently in use worldwide, the casting speed must not exceed certain upper values, because otherwise the number of strand breaks increases disproportionately. This is a consequence of the fact that the strand begins to oscillate at a certain casting speed, ie it moves back and forth between the guide rollers. This leads to canting and uneven heat dissipation on the strand in the vicinity of the mold outlet cross-section and consequently to stress cracks and strand breaks.
  • the crowning can extend over part of the strand width or over the entire strand width.
  • the total bulge of the strand should be 8%. preferably 2-4%. With higher values, better guidance is not achieved, but there is an unnecessary rolling effort.
  • a crowning over the entire strand width which is in the range of 2-4%, results in a much better initial cross-section for the subsequent rolling and fulfills the requirements of the rolling millers. It makes sense to crown the strand with e.g. to provide concave rollers up to the end of the strand guide frame or by the appropriate arrangement of split rollers in the strand guide area or by the deflection of the strand guide frames and / or the rollers in the elasticity area.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Surgical Instruments (AREA)
  • Electric Cable Installation (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Forging (AREA)
  • Metal Rolling (AREA)
  • Extrusion Of Metal (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

PCT No. PCT/DE95/00093 Sec. 371 Date Jul. 29, 1996 Sec. 102(e) Date Jul. 29, 1996 PCT Filed Jan. 20, 1995 PCT Pub. No. WO95/20446 PCT Pub. Date Aug. 3, 1995Molten metal is poured into a continuous casting mold having a rectangular mold exit opening to produce a rectangular metal strand having a liquid core, a width and a thickness. A convex shape is imparted to the rectangular strand along at least a part of the width thereof downstream of the casting mold by arranging a plurality of oppositely disposed guide rolls immediately downstream of the rectangular mold exit opening so that the cast strand while travelling from the mold exit opening through the plurality of guide rolls expands along at least part of its width no more than 8% of the strand thickness, thereby preventing snaking of the strand.

Description

StrangführungsgerüstStrand guide frame
Die Erfindung betrifft ein Strangführungsgerüst, mit dem ein Pendeln des Gußstranges verhindert wird.The invention relates to a strand guide frame, with which a swinging of the cast strand is prevented.
Aus dem Stand der Technik, z.B. DE 36 27 991 C2, sind Strangführungsgerüste bekannt, bei denen die Rollen keine geraden, sondern gekurvte Mantellinien haben. Solche Rollen kommen immer dann zur Anwendung, wenn der Kokillenaustrittsquerschnitt einen Strangquerschnitt erzeugt, der erheblich von der Rechteckform abweicht.From the prior art, e.g. DE 36 27 991 C2, strand guide stands are known in which the rollers have curved straight surface lines instead of straight ones. Such rolls are always used when the mold exit cross section creates a strand cross section that deviates significantly from the rectangular shape.
Bei Rechtecksträngen mit Strangdicken größer 60 bis 80 mm werden im Strangführungsgerüst unmittelbar unter der Stranggießkokilie (Segment 0) in der Regel Rollen mit geraden Mantellinien verwendet, wobei die Mantellinien jeweils paarweise einander gegenüberliegender Rollen zueinander parallel sind.In the case of rectangular strands with strand thicknesses greater than 60 to 80 mm, rolls with straight surface lines are generally used in the strand guiding structure directly under the continuous casting coconut (segment 0), the surface lines being parallel to one another in pairs.
Bei Strangführungsgerüsten mit derartigen Rollen ist die Gießgeschwindigkeit durch Pendeln oder Flattern der Stränge beschränkt, wobei folgende Werte üblicherweise angesetzt sind:In the case of strand guiding stands with such rolls, the casting speed is limited by the pendulum or fluttering of the strands, the following values usually being used:
- für Brammen der Dicke 230 mm ca. 1.8 - 2.0 m/min- for slabs with a thickness of 230 mm approx. 1.8 - 2.0 m / min
- für Vorblöcke der Dicke 270 mm ca. 1.5 - 1.7 m/min- for blooms with a thickness of 270 mm approx. 1.5 - 1.7 m / min
- für Knüppel des Formats 100 x 100 mm ca. 2.5 m/min.- for billets of the format 100 x 100 mm approx.2.5 m / min.
Aufgabe der Erfindung ist es, Rollen für die Strangführungsgerüste für Rechteckstränge bereitzustellen, bei denen die Rollen so ausgestaltet sind, daß ein Pendeln oder Flattern der Stränge unterbunden wird.The object of the invention is to provide rollers for the strand guide frames for rectangular strands, in which the rollers are designed in such a way that oscillation or fluttering of the strands is prevented.
Die Aufgabe wird gelöst durch die Merkmale des Anspruches 1. Die Unteransprüche beinhalten vorteilhafte Ausgestaltungen. Es hat sich gezeigt, daß bei Verwendung von Stranggießkokillen mit Rechteckquerschnitt und zylindrischen Führungsrolien. und das ist bei der Mehrzahl aller zur Zeit weltweit im Einsatz befindlichen Stranggießanlagen der Fall, die Gießgeschwindigkeit bestimmte obere Werte nicht überschreiten darf, weil sonst die Zahl der Strangdurchbrüche überproportional ansteigt. Das ist eine Folge des Umstandes, daß ab einer bestimmten - Gießgeschwindigkeit der Strang zu Pendeln beginnt, d.h., er bewegt sich zwischen den Führungsrollen hin und her. Das führt zu Verkantungen und ungleichmäßiger Wärmeabfuhr am Strang in der Umgebung des Kokillenaustrittsquerschnitts und in der Folge zu Spannungsrissen und Strangdurchbrüchen.The object is achieved by the features of claim 1. The subclaims contain advantageous refinements. It has been shown that when using continuous casting molds with a rectangular cross-section and cylindrical guide rails. and this is in the case of the majority of all continuous casting plants currently in use worldwide, the casting speed must not exceed certain upper values, because otherwise the number of strand breaks increases disproportionately. This is a consequence of the fact that the strand begins to oscillate at a certain casting speed, ie it moves back and forth between the guide rollers. This leads to canting and uneven heat dissipation on the strand in the vicinity of the mold outlet cross-section and consequently to stress cracks and strand breaks.
Es hat sich nun überraschend gezeigt, daß eine leichte Bombierung des Stranges das Pendeln unterbindet. Dabei weitet sich der Strang unmittelbar nach dem Austritt aus der Kokille infolge des noch flüssigen Kerns und der geringen Strangschalendicke sofort auf das durch die konkaven Manteliinien der Rollen vorgegebene Maß auf. Es legt sich also an die Rollen an und erhält so eine Führung, die das Pendeln oder auch "snaking", wie es in der Literatur beschrieben wird, unterbindet.It has now surprisingly been found that a slight curvature of the strand prevents the pendulum from swinging. The strand expands immediately after it emerges from the mold, due to the still liquid core and the small strand shell thickness, to the size predetermined by the concave sheathing of the rolls. So it attaches itself to the roles and thus receives a guidance that prevents the commuting or "snaking" as described in the literature.
Die Bombierung kann sich über einen Teil der Strangbreite oder über die gesamte Strangbreite erstrecken. Die gesamte Ausbauchung des Stranges sollte 8%. vorzugs¬ weise 2-4%, betragen. Mit höheren Werten wird keine bessere Führung erzielt, dagegen ergibt sich ein unnötiger Walzaufwand. Eine Bombierung über die gesamte Strangbreite, die im Bereich von 2-4% liegt, ergibt einen wesentlich besseren Ausgangsquerschnitt für das nachfolgende Walzen und erfüllt die dahingehenden Forderungen der Walzwerker. Es ist sinnvoll, die Bombierung des Stranges durch z.B. konkave Rollen bis zum Ende des Strangführungsgerüstes oder durch die entsprechende Anordnung von geteilten Rollen im Strangführungsbereich oder durch die Druchbiegung der Strangführungsgerüste und/oder der Rollen im Elastizitätsbereich vorzusehen.The crowning can extend over part of the strand width or over the entire strand width. The total bulge of the strand should be 8%. preferably 2-4%. With higher values, better guidance is not achieved, but there is an unnecessary rolling effort. A crowning over the entire strand width, which is in the range of 2-4%, results in a much better initial cross-section for the subsequent rolling and fulfills the requirements of the rolling millers. It makes sense to crown the strand with e.g. to provide concave rollers up to the end of the strand guide frame or by the appropriate arrangement of split rollers in the strand guide area or by the deflection of the strand guide frames and / or the rollers in the elasticity area.
Mit Hilfe der vorliegenden Erfindung ist es nicht nur möglich, bei neuen Anlagen die Gießgeschwindigkeit entsprechend zu steigern, sondern auch bei bestehenden Anlagen durch Nachrüsten mit entsprechend bombierten Rollen die Gießgeschwindigkeit gegenüber den in der Einleitung genannten Werten um bis zu 200% zu erhöhen und gleichzeitig die Gießsicherzeig zu steigern. With the help of the present invention, it is not only possible to increase the casting speed accordingly in new plants, but also to increase the casting speed in existing plants by retrofitting with appropriately cambered rollers by up to 200% compared to the values mentioned in the introduction, and at the same time increasing the Increase pouring safety.

Claims

Patentansprüche: Claims:
1. Strangführungsgerüst für Rechteckstränge mit paarweise einander gegenüberliegenden Führungs- und Treibrollen, wobei die Rollen eine leicht konkave Mantellinie aufweisen, die es dem Strang nach dem Austritt aus der Stranggießkokille mit rechteckigem Austrittsquerschnitt ermöglicht, sich ballig auszuweiten, wodurch der Strang eine exakte Führung erhält und ein Pendeln des Stranges unterbleibt.1.String guide frame for rectangular strands with pairs of opposing guide and drive rollers, the rollers having a slightly concave surface line, which enables the strand to emerge after exiting the continuous casting mold with a rectangular outlet cross section, thereby giving the strand precise guidance and the strand does not oscillate.
2. Strangführungsgerüst nach Anspruch 1 , dadurch gekennzeichnet, daß die konkave Mantellinie nur auf einem Teil, vorzugsweise 40% der Strangbreite ausgeführt ist.2. strand guide frame according to claim 1, characterized in that the concave surface line is carried out only on a part, preferably 40% of the strand width.
3. Strangführungsgerüst nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die konkave Mantellinie in ihrem Maximum 8%, vorzugsweise 2-4%, der Strangdicke nicht überschreitet.3. strand guide frame according to one of the preceding claims, characterized in that the concave surface line in its maximum 8%, preferably 2-4%, does not exceed the strand thickness.
4. Strangführungsgerüst nach den Ansprüchen 1 bis 4 dadurch gekennzeichnet, daß die Bombierung des Stranges durch eine entsprechende Durchbiegung des Strangführungsgerüstes im Elastizitätsbereich unter Gießbelastung erzielt wird.4. strand guide frame according to claims 1 to 4, characterized in that the crowning of the strand is achieved by a corresponding deflection of the strand guide frame in the elastic range under casting load.
5. Strangführungsgerüst nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß damit eine schon bestehende Stranggießanlage nachgerüstet wird. 5. strand guide frame according to one of the preceding claims, characterized in that an existing continuous casting installation is retrofitted therewith.
EP95906267A 1994-01-28 1995-01-19 Process for guiding a rectangular strand Expired - Lifetime EP0741618B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4403047A DE4403047C1 (en) 1994-01-28 1994-01-28 Strand guide frame
DE4403047 1994-01-28
PCT/DE1995/000093 WO1995020446A1 (en) 1994-01-28 1995-01-19 Guide system for continuously cast metal

Publications (2)

Publication Number Publication Date
EP0741618A1 true EP0741618A1 (en) 1996-11-13
EP0741618B1 EP0741618B1 (en) 2000-09-06

Family

ID=6509213

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95906267A Expired - Lifetime EP0741618B1 (en) 1994-01-28 1995-01-19 Process for guiding a rectangular strand

Country Status (11)

Country Link
US (1) US6070648A (en)
EP (1) EP0741618B1 (en)
JP (1) JP3069375B2 (en)
CN (1) CN1064871C (en)
AT (1) ATE196106T1 (en)
AU (1) AU1453395A (en)
CA (1) CA2182020A1 (en)
DE (2) DE4403047C1 (en)
ES (1) ES2149343T3 (en)
WO (1) WO1995020446A1 (en)
ZA (1) ZA95674B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AUPO928797A0 (en) * 1997-09-19 1997-10-09 Bhp Steel (Jla) Pty Limited Strip steering
DE19841841C2 (en) * 1998-03-09 2000-08-10 Sms Demag Ag Guide element of a continuous caster
EP3235579B2 (en) * 2016-04-18 2023-08-30 SMS Group GmbH Strand guiding device and method for supporting a cast strand
TWI717229B (en) 2020-03-11 2021-01-21 和碩聯合科技股份有限公司 Laptop computer chassis and laptop computer

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT335650B (en) * 1975-05-13 1977-03-25 Voest Ag FOR CONTINUOUS CASTING PLANTS
AT338984B (en) * 1975-11-12 1977-09-26 Voest Ag SUPPORT AND GUIDE FRAMEWORK, IN PARTICULAR SUPPORT AND GUIDE BOWS FOR CAST BRANDS
AT379093B (en) * 1984-02-16 1985-11-11 Voest Alpine Ag CONTINUOUS CHOCOLATE FOR A CONTINUOUS CASTING SYSTEM
JPS629758A (en) * 1985-07-05 1987-01-17 Sumitomo Metal Ind Ltd Continuous casting machine
JPS62148064A (en) * 1985-12-24 1987-07-02 Kobe Steel Ltd Casting slab guide apparatus
DE3627991A1 (en) * 1986-08-18 1988-02-25 Mannesmann Ag METHOD FOR CONTINUOUSLY MOLDING SLABS AND DEVICE FOR CARRYING OUT THE METHOD
JPH0763824B2 (en) * 1987-05-18 1995-07-12 住友金属工業株式会社 Pull-out correction device for continuous casting machine
GB8814331D0 (en) * 1988-06-16 1988-07-20 Davy Distington Ltd Continuous casting of steel
JP2949711B2 (en) * 1989-02-08 1999-09-20 住友金属工業株式会社 Continuous casting roll for unsolidification reduction
JPH0489161A (en) * 1990-07-30 1992-03-23 Nkk Corp Method for using roll in continuous caster
SU1771870A1 (en) * 1991-01-14 1992-10-30 Mariupolskij Metall I Method of continuous casting of blanks with right-angle section
JPH0790330B2 (en) * 1992-01-14 1995-10-04 川崎重工業株式会社 Horizontal continuous casting equipment
JPH05245604A (en) * 1992-03-05 1993-09-24 Kawasaki Steel Corp Continuous casting method
IT1262073B (en) * 1993-02-16 1996-06-19 Danieli Off Mecc LINGOTTIERA FOR CONTINUOUS CASTING OF THIN SLABS

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9520446A1 *

Also Published As

Publication number Publication date
ZA95674B (en) 1996-02-07
EP0741618B1 (en) 2000-09-06
US6070648A (en) 2000-06-06
WO1995020446A1 (en) 1995-08-03
DE59508704D1 (en) 2000-10-12
JPH09508069A (en) 1997-08-19
CN1064871C (en) 2001-04-25
JP3069375B2 (en) 2000-07-24
CA2182020A1 (en) 1995-08-03
DE4403047C1 (en) 1995-08-10
ATE196106T1 (en) 2000-09-15
CN1139895A (en) 1997-01-08
ES2149343T3 (en) 2000-11-01
AU1453395A (en) 1995-08-15

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