EP0177796A2 - Method of and installation for guiding and straightening a cast strand in the straight- and outlet region of a curved continuous casting plant - Google Patents

Method of and installation for guiding and straightening a cast strand in the straight- and outlet region of a curved continuous casting plant Download PDF

Info

Publication number
EP0177796A2
EP0177796A2 EP85111577A EP85111577A EP0177796A2 EP 0177796 A2 EP0177796 A2 EP 0177796A2 EP 85111577 A EP85111577 A EP 85111577A EP 85111577 A EP85111577 A EP 85111577A EP 0177796 A2 EP0177796 A2 EP 0177796A2
Authority
EP
European Patent Office
Prior art keywords
straightening
hydraulic
casting
rollers
crossmember
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
EP85111577A
Other languages
German (de)
French (fr)
Other versions
EP0177796B1 (en
EP0177796A3 (en
Inventor
Hans Streubel
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 Schloemann Siemag AG
Schloemann Siemag 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 Schloemann Siemag AG, Schloemann Siemag AG filed Critical SMS Schloemann Siemag AG
Priority to AT85111577T priority Critical patent/ATE39864T1/en
Publication of EP0177796A2 publication Critical patent/EP0177796A2/en
Publication of EP0177796A3 publication Critical patent/EP0177796A3/en
Application granted granted Critical
Publication of EP0177796B1 publication Critical patent/EP0177796B1/en
Expired legal-status Critical Current

Links

Images

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
    • B22D11/1226—Accessories for subsequent treating or working cast stock in situ for straightening strands

Definitions

  • the invention relates to a method for guiding and straightening a casting strand in the straightening and outlet area of a continuous sheet casting installation, wherein oppositely arranged rollers are held at a distance corresponding to the casting format by a spring force against the ferrostatic pressure.
  • the invention relates to a device for performing the method.
  • a movable roller crossmember is held in a position corresponding to the format in relation to the stationary roller crossmember by disc springs against the ferrostatic pressure.
  • the casting strand can have areas of increased strength, in particular at the beginning and end, due to greater cooling. If the adjustment crossbar is pressed on by an area of increased strength, the steep spring characteristic leads to a strong increase in force. This leads to jamming of the casting strand and overloading of individual rolls, particularly in the straightening and outlet area of the continuous casting plant. If the jamming leads to a standstill of the outfeed, the plate springs must be compressed further by an additional force and the movable roller crossbar raised to relieve the load.
  • the object of the invention is to provide a method and a device, jamming due to cast strand areas of increased strength being avoided and the roller load being considerably reduced.
  • a control system for carrying out the method consists of a continuous casting process computer, a path and control computer and a hydraulic control with connected hydraulic power devices.
  • the casting sequence data represented by the continuous casting process computer in particular about casting strand areas of increased strength, are passed to the sequence and control computer, which transmits signals to the hydraulic power devices to the hydraulic control system in accordance with the continuous conveying.
  • 1 consists of a continuous casting process computer 1, a path and control computer 2 and a hydraulic control 3, from which hydraulic power devices 4 of strand guide elements 5 ; be subjected to increased strength when passing through a casting strand area.
  • each hollow column 11 there is a spring sleeve 13, the bottom part 14 of which is fastened to the fixed crossbeam 8 by means of bolts 15.
  • a tie rod 16 is clamped by means of plate springs 17. The tie rod 16 is guided in the base piece 14 and in an upper sleeve cover 18.
  • Spindle lifting elements 19 are arranged on the adjustment crossmember 9, the spindles of which are connected to a head 22 fastened to the tie rod 16 via a fork piece 20 and a bolt 21.
  • a hydraulic nut 23 is arranged between the upper sleeve cover 18 and the head 22.
  • a tie rod 24 is clamped within a spring sleeve 27 by means of two helical springs 25, 26 acting in parallel.
  • Each helical spring 25, 26 acts within the spring sleeve 27 against its own abutment surface 28 or 29.
  • a base piece 30 of the spring sleeve 27 is designed as a hydraulic cylinder, the piston 31 of which acts against the tie rod 24 when acted upon.

Abstract

1. Method for the guiding and straightening of a continuously cast billet in the straightening and outlet region of a curved continuous casting plant, wherein rollers arranged to lie one opposite the other are held at a spacing corresponding to the casting format by a spring force against the ferrostatic pressure of the continuously cast billet, characterised thereby, that a continuously cast billet region of increased strength is tracked in its travel and, on its passage between the rollers lying one opposite the other, the respective spring force is reduced by a smaller additional force.

Description

Die Erfindung betrifft ein Verfahren zum Führen und Richten eines Gießstranges im Richt- und Auslaufbereich einer Bogenstranggießanlage, wobei gegenüberliegend angeordnete Rollen von einer Federkraft gegen den ferrostatischen Druck in einem dem Gießformat entsprechenden Abstand gehalten werden. Darüber hinaus betrifft die Erfindung eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for guiding and straightening a casting strand in the straightening and outlet area of a continuous sheet casting installation, wherein oppositely arranged rollers are held at a distance corresponding to the casting format by a spring force against the ferrostatic pressure. In addition, the invention relates to a device for performing the method.

Bei einem bekannten Verfahren wird eine bewegliche Rollentraverse gegenüber einer ortsfesten Rollentraverse durch Tellerfedern gegen den ferrostatischen Druck in einer dem Format entsprechenden Position gehalten. Der Gießstrang kann insbesondere am Anfang und Ende durch stärkere Abkühlung Bereiche erhöhter Festigkeit aufweisen. Wird nun durch einen Bereich erhöhter Festigkeit die Verstelltraverse aufgedrückt, so kommt es infolge der steilen Federkennlinie zu einem starken Kraftanstieg. Dies führt insbesondere im Richt- und Auslaufbereich der Stranggießanlage zur Verklemmung des Gießstranges und zur Überlastung einzelner Rollen. Führt die Verklemmung zu einem Ausförderstillstand so müssen die Tellerfedern durch eine zusätzliche Kraft weiter zusammengedrückt und die bewegliche Rollentraverse entlastend hochgefahren werden.In a known method, a movable roller crossmember is held in a position corresponding to the format in relation to the stationary roller crossmember by disc springs against the ferrostatic pressure. The casting strand can have areas of increased strength, in particular at the beginning and end, due to greater cooling. If the adjustment crossbar is pressed on by an area of increased strength, the steep spring characteristic leads to a strong increase in force. This leads to jamming of the casting strand and overloading of individual rolls, particularly in the straightening and outlet area of the continuous casting plant. If the jamming leads to a standstill of the outfeed, the plate springs must be compressed further by an additional force and the movable roller crossbar raised to relieve the load.

Aufgabe der Erfindung ist die Schaffung eines Verfahrens und einer Vorrichtung, wobei Verklemmungen durch Gießstrangbereiche erhöhter Festigkeit vermieden und die Rollenbelastung erheblich reduziert wird.The object of the invention is to provide a method and a device, jamming due to cast strand areas of increased strength being avoided and the roller load being considerably reduced.

Dies wird erfindungsgemäß dadurch erreicht, daß ein Gießstrangbereich erhöhter Festigkeit wegverfolgt wird und bei dessen Durchlauf die jeweilige Federkraft durch eine geringere Zusatzkraft reduziert wird.This is achieved according to the invention in that a cast strand region of increased strength is traced away and the respective spring force is reduced by a lower additional force during its passage.

Auf diese Weise kann ein Verklemmen von Gießstrangbereichen erhöhter Festigkeit in der Strangführung und damit eine Überlastung von Rollen vermieden werden.In this way, jamming of strand sections of increased strength in the strand guide and thus overloading of rollers can be avoided.

Ein Steuersystem zur Durchführung des Verfahrens besteht gemäß einem weiteren Merkmal der Erfindung aus einem Stranggießprozeßrechner, einem Wegfolge- und Steuerungsrechner und einer Hydrauliksteuerung mit angeschlossenen hydraulischen Kraftgeräten. Die vom Stranggießprozeßrechner dargestellten Gießablaufdaten insbesondere über Gießstrangbereiche erhöhter Festigkeit werden an den Wegfolge- und Steuerungsrechner geleitet, der entsprechend der Strangförderung an die Hydrauliksteuerung Signale zur Beaufschlagung der hydraulischen Kraftgeräte übermittelt.According to a further feature of the invention, a control system for carrying out the method consists of a continuous casting process computer, a path and control computer and a hydraulic control with connected hydraulic power devices. The casting sequence data represented by the continuous casting process computer, in particular about casting strand areas of increased strength, are passed to the sequence and control computer, which transmits signals to the hydraulic power devices to the hydraulic control system in accordance with the continuous conveying.

Weitere vorrichtungsmäßige Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen.Further device-like configurations of the invention result from the subclaims.

In der Zeichnung sind Ausführungsbeispiele der Erfindung dargestellt. Es zeigen

  • Fig. 1 ein Steuersystem zur Durchführung des Verfahrens,
  • Fig. 2 ein Strangführungselement im Richt- und Auslaufbereich einer Stranggießanlage und
  • Fig. 3 eine aus Zuganker und Druckfeder bestehende alternative Verbindungseinheit.
Exemplary embodiments of the invention are shown in the drawing. Show it
  • 1 shows a control system for performing the method,
  • Fig. 2 is a strand guide element in the straightening and outlet area of a continuous casting plant and
  • Fig. 3 is an alternative connecting unit consisting of tie rod and compression spring.

Das Steuersystem gemäß Fig. 1 besteht aus einem Stranggießprozeßrechner 1, einem Wegfolge- und Steuerungsrechner 2 und einer Hydrauliksteuerung 3, von der aus hydraulische Kraftgeräte 4 von Strangführungselementen 5; beim Durchlauf eines Gießstrangbereichs erhöhter Festigkeit beaufschlagt werden.1 consists of a continuous casting process computer 1, a path and control computer 2 and a hydraulic control 3, from which hydraulic power devices 4 of strand guide elements 5 ; be subjected to increased strength when passing through a casting strand area.

In dem Strangführungselement gemäß Fig. 2 sind fünf untere Rollen 6 an einer Festtraverse 7 und fünf obere Rollen 8 an einer Verstelltraverse 9 gelagert, wobei jeweils eine mittlere Rolle angetrieben ist, die an der Verstelltraverse 9 durch Druckmittelzylinder 10 anstellbar sind. An der Festtraverse 7 sind vier Hohlsäulen 11 angebracht, an deren Innenseiten die Verstelltraverse 10 mittels Gleitstücken 12 geführt ist.In the strand guide element according to FIG. 2, five lower rollers 6 are mounted on a fixed crossbar 7 and five upper rollers 8 on an adjustable crossbar 9, a central roller being driven in each case, which can be adjusted on the adjustable crossbar 9 by pressure medium cylinders 10. Four hollow columns 11 are attached to the fixed crossbeam 7, on the inside of which the adjusting crossbeam 10 is guided by means of sliding pieces 12.

In jeder Hohlsäule 11 befindet sich eine Federhülse 13, deren Bodenstück 14 mittels Bolzen 15 an der Festtraverse 8 befestigt sind. In jeder Federhülse 13 ist ein Zuganker 16 mittels Tellerfedern 17 verspannt. Der Zuganker 16 ist im Bodenstück 14 und in einem oberen Hülsendeckel 18 geführt.In each hollow column 11 there is a spring sleeve 13, the bottom part 14 of which is fastened to the fixed crossbeam 8 by means of bolts 15. In each spring sleeve 13, a tie rod 16 is clamped by means of plate springs 17. The tie rod 16 is guided in the base piece 14 and in an upper sleeve cover 18.

Auf der Verstelltraverse 9 sind Spindelhubelemente 19 angeordnet, deren Spindeln über ein Gabelstück 20 und einen Bolzen 21 mit einem an dem Zuganker 16 befestigten Kopf 22 verbunden ist. Zwischen dem oberen Hülsendeckel 18 und dem Kopf 22 ist eine Hydraulikmutter 23 angeordnet.Spindle lifting elements 19 are arranged on the adjustment crossmember 9, the spindles of which are connected to a head 22 fastened to the tie rod 16 via a fork piece 20 and a bolt 21. A hydraulic nut 23 is arranged between the upper sleeve cover 18 and the head 22.

Sobald ein Gießstrangbereich erhöhter Festigkeit das Strangführungselement erreicht, werden die Hydraulikmuttern 23 von der Hydrauliksteuerung 3 beaufschlagt. Dadurch wird die vom Zuganker 16 auf die Verstelltraverse 9 übertragene Zuhaltekraft reduziert. Falls der Gießstrangbereich erhöhter Festigkeit die Verstelltraverse 9 aufdrückt, können die aufgrund der Federkennlinie ansteigenden Zuhaltkräfte nicht zu einer Überlastung der Rollen 6, 8 führen.As soon as a cast strand region of increased strength reaches the strand guide element, the hydraulic nuts 23 are acted upon by the hydraulic control 3. As a result, the locking force transmitted from the tie rod 16 to the adjustment crossbar 9 reduced. If the cast strand area of increased strength presses on the adjustment crossbar 9, the locking forces increasing due to the spring characteristic cannot lead to an overload of the rollers 6, 8.

Bei dem in Fig. 3 dargestellten alternativen Verbidnungselement ist ein Zuganker 24 mittels zweier parallelwirkender Schraubenfedern 25, 26 innerhalb einer Federhülse 27 verspannt. Dabei wirkt jede Schraubenfeder 25, 26 innerhalb der Federhülse 27 gegen eine eigene Anschlagfläche 28 bzw. 29. Ein Bodenstück 30 der Federhülse 27 ist als Hydraulikzylinder ausgebildet, dessen Kolben 31 bei Beaufschlagung gegen den Zuganker 24 wirkt.In the alternative connecting element shown in FIG. 3, a tie rod 24 is clamped within a spring sleeve 27 by means of two helical springs 25, 26 acting in parallel. Each helical spring 25, 26 acts within the spring sleeve 27 against its own abutment surface 28 or 29. A base piece 30 of the spring sleeve 27 is designed as a hydraulic cylinder, the piston 31 of which acts against the tie rod 24 when acted upon.

Claims (5)

1. Verfahren zum Führen und Richten eines Gießstranges im Richt- und Auslaufbereich einer Bogenstranggießanlage, wobei gegenüberliegend angeordnete Rollen von einer Federkraft gegen den ferrostatischen Druck des Gießstranges in einem dem Gießformat entsprechenden Abstand gehalten werden,
dadurch gekennzeichnet,
daß ein Gießstrangbereich erhöhter Festigkeit wegverfölgt wird und bei dessen Durchlauf die jeweilige Federkraft durch eine geringere Zusatzkraft reduziert wird.1. Method for guiding and straightening a casting strand in the straightening and outlet area of a continuous sheet casting installation, wherein oppositely arranged rollers are held at a distance corresponding to the casting format by a spring force against the ferrostatic pressure of the casting strand,
characterized,
that a casting strand area of increased strength is sold away and when it passes through, the respective spring force is reduced by a lower additional force. 2. Steuersystem zur Durchführung des Verfahrens nach Anspruch 1, gekennzeichnet,
durch einen Stranggießprozeßrechner (1), einen Wegfolge-und Steuerungsrechnet (2) und eine Hydrauliksteuerung (3) mit angeschlossenen hydraulischen Kraftgeräten (4).2. Control system for performing the method according to claim 1, characterized in
by a continuous casting process computer (1), a path and control computer (2) and a hydraulic controller (3) with connected hydraulic power devices (4). 3. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1, wobei Rollen abschnittsweise gegenüberliegend an einer ortsfesten Traverse bzw. einer Verstelltraverse gelagert sind, die durch innerhalb von Hülsen durch Druckfedern belastete Zuganker auf Formatabstand gehalten werden, wobei den Zugankern hydraulische Kraftgeräte zugeordnet sind,
dadurch gekennzeichnet,
daß zwischen einem Hülsendeckel (18) und einem Zugstangen kopf (22) eine Hydraulikmutter (23) angeordnet ist.3. Apparatus for carrying out the method according to claim 1, wherein rollers are mounted in sections opposite one another on a fixed crossmember or an adjusting crossmember, which are held at format spacing by tension rods loaded by compression springs within sleeves, hydraulic force devices being assigned to the tension rods,
characterized,
that between a sleeve cover (18) and a tie rod head (22) a hydraulic nut (23) is arranged. 4. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1, wobei Rollen abschnittsweise gegenüberliegend an einer ortsfesten Traverse bzw. einer Verstelltraverse gelagert sind, die durch innerhalb von Hülsen durch Druckfedern belastete Zuganker auf Formatabstand gehalten werden, wobei den Zugankern hydraulische Kraftgeräte zugeordnet sind,
dadurch gekennzeichnet,
daß ein Bodenstück (30) der Federhülse (27) als Hydraulikzylinder ausgebildet ist, dessen Kolben (31) auf den Zuganker (24) gerichtet ist.4. Apparatus for carrying out the method according to claim 1, wherein rollers are mounted in sections opposite one another on a fixed crossmember or an adjusting crossmember, which are held at format spacing by tension rods loaded by compression springs within sleeves, hydraulic tension devices being assigned to the tension rods,
characterized,
that a bottom piece (30) of the spring sleeve (27) is designed as a hydraulic cylinder, the piston (31) of which is directed towards the tie rod (24). 5. Vorrichtung nach Anspruch 3 oder 4,
dadurch gekennzeichnet,
daß innerhalb der Federhülse (27) auf dem Zuganker (24) zwei Schraubenfedern (25, 26) angeordnet sind, denen innerhalb der Federhülse je eine eigene Anschlagfläche (28, 29) zugeordnet ist.5. The device according to claim 3 or 4,
characterized,
that two helical springs (25, 26) are arranged on the tie rod (24) within the spring sleeve (27), each of which has its own stop surface (28, 29) assigned to it within the spring sleeve.
EP85111577A 1984-10-10 1985-09-13 Method of and installation for guiding and straightening a cast strand in the straight- and outlet region of a curved continuous casting plant Expired EP0177796B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85111577T ATE39864T1 (en) 1984-10-10 1985-09-13 METHOD AND DEVICE FOR GUIDING AND ADJUSTING A CASTING STRAND IN THE ADJUSTMENT AND OUTLET AREA OF AN ARCH-CUSHED CONTINUOUS CASTING PLANT.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3437178 1984-10-10
DE19843437178 DE3437178A1 (en) 1984-10-10 1984-10-10 METHOD AND DEVICE FOR GUIDING AND Straightening a Casting Line in the Straightening and Discharge Area of an Arch Continuous Casting System

Publications (3)

Publication Number Publication Date
EP0177796A2 true EP0177796A2 (en) 1986-04-16
EP0177796A3 EP0177796A3 (en) 1987-03-25
EP0177796B1 EP0177796B1 (en) 1989-01-11

Family

ID=6247572

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85111577A Expired EP0177796B1 (en) 1984-10-10 1985-09-13 Method of and installation for guiding and straightening a cast strand in the straight- and outlet region of a curved continuous casting plant

Country Status (4)

Country Link
EP (1) EP0177796B1 (en)
JP (1) JPS6192766A (en)
AT (1) ATE39864T1 (en)
DE (2) DE3437178A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02148758U (en) * 1989-05-12 1990-12-18
DE10011689A1 (en) 2000-03-10 2001-09-13 Sms Demag Ag Process for the continuous casting of slabs and in particular thin slabs
DE10118518A1 (en) * 2001-04-14 2002-10-24 Sms Demag Ag Process for continuously casting slabs, especially thin slabs, in a continuously casting device comprises forming bulges from a casting strand within a region of a liquid core path

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1402640A (en) * 1971-07-03 1975-08-13 Schloemann Ag Withdrawing a continuous casting
US4056140A (en) * 1976-10-20 1977-11-01 United States Steel Corporation Method and mechanism for controlling forces in a continuous-casting machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1402640A (en) * 1971-07-03 1975-08-13 Schloemann Ag Withdrawing a continuous casting
US4056140A (en) * 1976-10-20 1977-11-01 United States Steel Corporation Method and mechanism for controlling forces in a continuous-casting machine
DE2747000A1 (en) * 1976-10-20 1978-04-27 Uss Eng & Consult METHOD FOR CONTROLLING THE BETWEEN GUIDE ROLLS AND A STRING EXERCISED AND A RELATED ROLLER PAIR ARRANGEMENT

Also Published As

Publication number Publication date
DE3437178A1 (en) 1986-04-10
JPS6192766A (en) 1986-05-10
EP0177796B1 (en) 1989-01-11
DE3567392D1 (en) 1989-02-16
EP0177796A3 (en) 1987-03-25
ATE39864T1 (en) 1989-01-15

Similar Documents

Publication Publication Date Title
DE2062792C3 (en) Support guide frame for continuous casting plants
DE69906649T2 (en) Method and device for breaking a connecting rod
DE3032355A1 (en) HYDRAULIC DIE FORGING PRESS IN SURFACE DESIGN WITH PRELOADED PRESS RACK
EP0618024B1 (en) Frame for strand guiding
EP1286797B1 (en) Method and device for adjusting one or more roll segments in a continuous casting installation for casting metals, especially for steel materials
DE3017025A1 (en) HIGH PRESSURE PRESS
EP0177796B1 (en) Method of and installation for guiding and straightening a cast strand in the straight- and outlet region of a curved continuous casting plant
DE3323931C2 (en) Hydraulic press
DE19781923C2 (en) Guide arrangement for a cast strand in a continuous casting machine
DE2021780C3 (en) Method for adapting the arch guide of a strand emerging from a continuous casting mold and device for this
EP1941956B1 (en) Bending press for bending a plate in the manufacture of a pipe
EP0838277B1 (en) Leveller for levelling strips to be fed to the entrance of a press
DE1652614A1 (en) Press with a sliding table or the like that can be removed from this.
DE2810595A1 (en) ADJUSTMENT AND OVERLOAD PROTECTION DEVICE FOR A PRESS
EP0064227B1 (en) Roller guide, particularly for a conveying and straightening machine of a continuous casting plant
DE914098C (en) Hydraulic toggle press
DE2210795C3 (en) Hydraulic vertical press
EP4041470B1 (en) Device for stretching a metal semi-finished product in the form of individual plates along a stretching section with a stretching frame, and method for stretching a metal semi-finished product using the device
EP0058869B1 (en) Guiding support stand in the driving and/or straightening range of a continuous casting plant
EP0484781B1 (en) Slab upsetting press for hot wide strip rolling mills
DE3238939A1 (en) DEVICE FOR PRODUCING METAL STRIPS
DE19716664C2 (en) Method and device for bracing two opposite broad side walls of a continuous casting mold
DE10024514A1 (en) Continuous casting apparatus has springs directed in the longitudinal extension normally onto the longitudinal plane of the apparatus receiving the mold longitudinal axis and the casting axis
EP0205772B1 (en) Walking beam transport system
DE3709204C1 (en) Belt release device for a system for the vulcanisation of conveyor belts

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19850923

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT DE FR GB LU

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT DE FR GB LU

17Q First examination report despatched

Effective date: 19870909

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT DE FR GB LU

REF Corresponds to:

Ref document number: 39864

Country of ref document: AT

Date of ref document: 19890115

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3567392

Country of ref document: DE

Date of ref document: 19890216

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
ET Fr: translation filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19890711

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19890904

Year of fee payment: 5

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19890930

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19890930

Year of fee payment: 5

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

26 Opposition filed

Opponent name: VOEST-ALPINE INDUSTRIEANLAGENBAU GESELLSCHAFT M.B.

Effective date: 19891011

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19900913

Ref country code: AT

Effective date: 19900913

GBPC Gb: european patent ceased through non-payment of renewal fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19910530

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19931130

Year of fee payment: 9

RDAG Patent revoked

Free format text: ORIGINAL CODE: 0009271

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: PATENT REVOKED

27W Patent revoked

Effective date: 19931203