EP0143347B1 - Dispositif d'essai pour la détermination de défauts sur les bandes de coulée d'un moule de coulée continue - Google Patents

Dispositif d'essai pour la détermination de défauts sur les bandes de coulée d'un moule de coulée continue Download PDF

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Publication number
EP0143347B1
EP0143347B1 EP84112966A EP84112966A EP0143347B1 EP 0143347 B1 EP0143347 B1 EP 0143347B1 EP 84112966 A EP84112966 A EP 84112966A EP 84112966 A EP84112966 A EP 84112966A EP 0143347 B1 EP0143347 B1 EP 0143347B1
Authority
EP
European Patent Office
Prior art keywords
casting
units
casting belt
belt
test installation
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
Application number
EP84112966A
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German (de)
English (en)
Other versions
EP0143347A1 (fr
Inventor
Gerd Artz
Dieter Figge
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.)
Vodafone GmbH
Original Assignee
Fried Krupp 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 Fried Krupp AG filed Critical Fried Krupp AG
Priority to AT84112966T priority Critical patent/ATE31156T1/de
Publication of EP0143347A1 publication Critical patent/EP0143347A1/fr
Application granted granted Critical
Publication of EP0143347B1 publication Critical patent/EP0143347B1/fr
Expired legal-status Critical Current

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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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0605—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two belts, e.g. Hazelett-process

Definitions

  • the invention relates to a test device for determining damage to the casting belts of a continuous casting mold that form the mold walls that move along.
  • Continuous casting molds with moving mold walls which consist in particular of opposing continuous casting belts in pairs and subsequent continuous side dams (DE-C2-2 445 912), are used to achieve high casting speeds (of the order of 10 m / min.) When casting lead .
  • Zinc, copper and steel are used.
  • Such double belt continuous casting molds are equipped at the top and bottom with a casting belt, which consists of carbon steel and has a thickness of about 1 mm. Since the thin casting belts are subject to considerable thermomechanical stress, which can lead in particular to the formation of cracks, they are replaced after about 24 to 32 hours despite the relatively low operating temperatures prevailing when casting lead, zinc and copper; this is only done as a precaution, because the exact point in time that it becomes unusable has not yet been determined. When casting metals, the timely detection of damage to the casting belts is also particularly desirable because if the molten metal hits the cooling water in the area of the continuous casting mold, there is a risk of explosion with adverse consequences for the facilities in the area.
  • the invention has for its object to develop a device for the early detection of damage to the particularly vulnerable casting tapes of continuous casting molds, which can be used in particular when casting steel, but also in the processing of non-ferrous metals.
  • the test facility should be designed in such a way that the casting belts can be continuously monitored during the casting operation for the development of cracks and other defects without impairing their function.
  • test device with the features of claim 1.
  • the idea of the solution on which the invention is based then consists in assigning each casting belt to a plurality of fixed test units designed as transmitter-receiver units, which operate according to the ultrasound method and whose transmission signals continuously incident on the casting belt are received by the receiver in the form of damped return signals.
  • the test units known per se are arranged and designed so that their test heads are opposite the associated casting belt at a short distance; this is bridged by a water film, which serves as a coupling medium between the casting belt and the ° probes.
  • the distance, and thus the thickness of the water film is of the order of a few tenths of a millimeter during the casting operation.
  • the already available cooling water which is provided for cooling the casting belts, is expediently used as the coupling medium.
  • test units A constant position of the test heads with respect to the respectively associated casting belt can be ensured in that the test units are held pivotably about horizontal axes (claim 4), that is to say align themselves under the effect of their own weight.
  • the test units can be equipped with spring elements effective in the direction of the casting belts (claim 5). This training is particularly considered when the test units face the downward-facing surface of a casting belt.
  • Each casting belt is expediently equipped with at least two transverse sound units and an inclined sound unit, which - viewed in plan view - emit sound waves directed transversely or obliquely to its longitudinal extent (claim 6).
  • each casting belt is assigned two transverse sound units and one oblique sound unit, which is approximately in a line transverse to the longitudinal extent of the casting belt with the first transverse sound unit in its direction of rotation.
  • the angle at which the inclined sound units are oriented with respect to the longitudinal extent of the associated casting belt is in the order of 30 to 60 °, preferably in the order of 45 °.
  • Each casting belt has four test units in the form of two transverse sound units and two inclined sound units, the transverse sound units - seen in the direction of rotation of the casting belt - lying behind the two inclined sound units. which are arranged approximately in a line transverse to the longitudinal extension of the casting belt (claim 7).
  • the two transverse sound units emit opposite sound waves and are therefore arranged one behind the other - as seen in the direction of rotation of the casting belt.
  • the test device can be completed by suitable additional devices, which may enable a fully automatic mode of operation.
  • suitable additional devices which may enable a fully automatic mode of operation.
  • these can be equipped with a measuring point switch known per se.
  • the schematically illustrated double belt continuous casting mold 1 has, as the moving mold walls, an upper and lower endless casting belt 2 or 2 'and two laterally adjoining endless side dams 3, which are composed of individual elements 3' which are lined up in a mutually movable manner. While the approximately 1 mm thick casting belts 2, 2 'consist of carbon steel, the individual links 3' are made of a copper alloy.
  • the mold walls 2, 2 'and 3 delimit a casting cavity 4 with a rectangular cross section, the inlet 4' and outlet 4 "of which are located on the left and right side of the continuous casting mold and through which the steel melt to be processed, which gradually solidifies, in the casting direction, ie in The direction of rotation of the mold walls - which in the area of the inlet 4 'and outlet 4 "each have deflection units in the form of deflection rollers 6 with fixed axes 6' or comparable deflection units (not shown) - is accordingly selected so that these move in the area of the casting cavity 4 in the same direction and at the same speed from left to right.
  • test units 7 For continuous monitoring of the thermally and mechanically highly stressed casting belts 2 and 2 'for damage in the form of cracks, holes and the like, several ultrasound test units 7, each designed as a transmitter-receiver units, are arranged near the rear deflection rollers 6 in the circumferential direction Test heads 7 'lie in the casting belt area which executes the return movement opposite to the casting direction.
  • the test units 7 are each assigned to the surface of the casting belt 2 or 2 ', which - in relation to the casting cavity 4 - forms the outer surface which does not come into contact with the molten steel: they are therefore within the endless path of the respective casting belt.
  • Each test unit 7 is held on a stationary bracket 8 so as to be pivotable about a horizontal axis of rotation 9 and equipped with slide shoes 10 which, in the case of the upper casting belt 2, act under the action of a prestressed spring element 8 'or under the effect of their own weight (in the case of the lower one Support the casting belt 2 ') flexibly over a water film on the outer surface of the casting belt in question.
  • the water film forms the coupling medium via which the test heads 7 'are connected to the associated casting belt in terms of sound technology; the associated water is supplied via spray openings (not shown) arranged in the sliding blocks 10 of the test units 7.
  • the transmitters and receivers are arranged in the test heads 7 '; the receiver picks up the return signal damped by the casting belt 2 or 2 '; this differs markedly in the presence of damage which changes the damping effect from the return signal which arises when the transmission signal strikes the undamaged casting belt.
  • the advantage associated with the use of test units operating according to the ultrasound method is, in particular, that the method of operation of the test device with regard to recording and evaluating measurement results can be automated, that the coating agent (coating) on the casting belts does not influence the fault detection, that the signal sequence of the test units casting speeds and consequently circulation speeds of the casting belts up to above 100 m / min. allows and that with appropriate alignment of the test heads, damage, in particular cracks, lying in different directions can also be determined.
  • the known test units 7 basically consist of oscillating elements 11, which are supported on the side and enclosed by a damping housing 12 on a piezo element 13). At the same time, this forms the already mentioned slide shoe, under which a thin liquid cushion forms as a coupling medium during the casting operation.
  • the return movement of the illustrated lower casting belt 2 ', which is opposite to the casting direction, is indicated by a dashed arrow 16.
  • the defect which can be ascertained by means of the test unit 7 and which results in a different return signal is designated by 17.
  • the lateral position of the test units 18 and 19 is expediently chosen so that the entire area of the casting belt which is particularly at risk — corresponding to the width of the casting cavity 4 (cf. FIG. 1) - is detected.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Claims (7)

1. Dispositif d'essai pour la détermination de défauts pouvant survenir dans les bandes de coulée qui constituent les parois mobiles d'un moule de coulée continue, dans lequel à chaque bande de coulée continue (2, 2') sont associées plusieurs unités de contrôle par ultra-sons fixes (7. 18, 19) qui sont des unités groupant des émetteurs et des récepteurs, et dont les signaux d'émission qui arrivent en permanence sur la bande de coulée sont reçus par le récepteur sous la forme de signaux de retour amortis.
2. Dispositif d'essai selon la revendication 1, dans lequel les unités de contrôle (7, 18, 19) sont placées dans la zone de la bande de coulée (2, 2') qui effectue un mouvement de retour (flèche 16) dans le sens opposé au sens de la coulée (flèche 5).
3. Dispositif d'essai selon l'une des revendications 1 ou 2, dans lequel les unités de contrôle (7, 18, 19) prennent appui sur des patins mobiles (10) par l'intermédiaire d'un film d'eau sur la bande de coulée (2, 2'), l'eau étant amenée par des orifices de projection ménagés dans la zone des unités de contrôle.
4. Dispositif d'essai selon l'une des revendications 1 à 3, dans lequel les unités de contrôle (7) sont montées de manière à pouvoir pivoter autour d'axes horizontaux (9).
5. Dispositif d'essai selon l'une des revendications 1 à 4, dans lequel les unités de contrôle (7) sont équipées d'éléments élastiques (8') agissant dans la direction des bandes de coulée (2).
6. Dispositif d'essai selon l'une des revendications 1 à 5, dans lequel chaque bande de coulée (2') comprend au moins deux dispositifs acoustiques transversaux (19) et un dispositif acoustique oblique (18) qui émettent des ondes sonores (19' ou 18') orientées, vues par en-dessus, transversalement ou obliquement par rapport à sa direction longitudinale.
7. Dispositif d'essai selon la revendication 6. dans lequel chaque bande de coulée (2') comporte quatre unités de contrôle constituées par deux dispositifs acoustiques transversaux (19) et deux dispositifs acoustiques obliques (18), les dispositifs acoustiques transversaux vus dans le sens de la rotation (flèche 16) de la bande de coulée (2'), se trouvant derrière les deux dispositifs acoustiques obliques qui sont disposés sensiblement sur une ligne orientée transversalement par rapport à la direction longitudinale de la bande de coulée.
EP84112966A 1983-11-26 1984-10-27 Dispositif d'essai pour la détermination de défauts sur les bandes de coulée d'un moule de coulée continue Expired EP0143347B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84112966T ATE31156T1 (de) 1983-11-26 1984-10-27 Pruefeinrichtung zur feststellung von beschaedigungen an den giessbaendern einer stranggiesskokille.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3342941A DE3342941C1 (de) 1983-11-26 1983-11-26 Pruefeinrichtung zur Feststellung von Beschaedigungen an den Giessbaendern einer Stranggiesskokille
DE3342941 1983-11-26

Publications (2)

Publication Number Publication Date
EP0143347A1 EP0143347A1 (fr) 1985-06-05
EP0143347B1 true EP0143347B1 (fr) 1987-12-02

Family

ID=6215427

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84112966A Expired EP0143347B1 (fr) 1983-11-26 1984-10-27 Dispositif d'essai pour la détermination de défauts sur les bandes de coulée d'un moule de coulée continue

Country Status (5)

Country Link
US (1) US4573521A (fr)
EP (1) EP0143347B1 (fr)
JP (1) JPS60133954A (fr)
AT (1) ATE31156T1 (fr)
DE (1) DE3342941C1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3444689A1 (de) * 1984-12-07 1986-01-16 Fried. Krupp Gmbh, 4300 Essen Fuehrungseinrichtung an den giessbaendern einer doppelbandstranggiesskokille
US5086827A (en) * 1990-12-06 1992-02-11 Hazelett Strip-Casting Corporation Method and apparatus for sensing the condition of casting belt and belt coating in a continuous metal casting machine
DE102005001431B4 (de) * 2005-01-12 2013-01-17 Robert Bosch Gmbh Zugmitteltrieb, Verfahren zur Erfassung des Verschleißes eines endlosen Zugmittels und endloses Zugmittel für einen solchen Zugmitteltrieb
US7298152B1 (en) 2006-05-19 2007-11-20 The Boeing Company Damage detection system
DE102007057278A1 (de) * 2007-08-04 2009-02-05 Sms Demag Ag Verfahren und Vorrichtung zur Vergleichmäßigung des Wärmeübergangs eines Gussprodukts während seiner Erstattung auf dem Metalltransportband einer horizontalen Bandgießanlage
US8594882B2 (en) * 2008-01-16 2013-11-26 The Boeing Company Damage detection system
ATE539823T1 (de) 2008-03-05 2012-01-15 Southwire Co Ultraschallsonde mit schutzschicht aus niobium
US8574336B2 (en) 2010-04-09 2013-11-05 Southwire Company Ultrasonic degassing of molten metals
US8652397B2 (en) 2010-04-09 2014-02-18 Southwire Company Ultrasonic device with integrated gas delivery system
JP6674376B2 (ja) 2013-11-18 2020-04-01 サウスワイヤー・カンパニー・リミテッド・ライアビリティ・カンパニーＳｏｕｔｈｗｉｒｅ Ｃｏｍｐａｎｙ，Ｌｌｃ 溶融金属の脱ガス用排気口付き超音波プローブ
HUE048957T2 (hu) 2015-02-09 2020-09-28 Hans Tech Llc Ultrahangos szemcsefinomítás
US10233515B1 (en) 2015-08-14 2019-03-19 Southwire Company, Llc Metal treatment station for use with ultrasonic degassing system
EP3347150B1 (fr) 2015-09-10 2020-08-19 Southwire Company, LLC Dispositif de raffinage de grains et de dégazage à ultrasons pour la coulée de métaux

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE576793A (fr) * 1958-03-17
CH443576A (de) * 1966-07-14 1967-09-15 Concast Ag Verfahren und Vorrichtung zum Ankoppeln von Ultraschall an heisse Metalle, insbesondere beim Stranggiessen
CH479071A (de) * 1966-12-13 1969-09-30 Concast Ag Vorrichtung zur Lokalisierung von Inhomogenitäten nach dem Ultraschall-Echo-Prinzip, insbesondere zur Bestimmung der Phasengrenze fest/flüssig beim Stranggiessen
DE2501868C3 (de) * 1975-01-15 1978-08-03 Mannesmann Ag, 4000 Duesseldorf Verfahren zur Regelung und Überwachung des Stranggießens von Stahl
DE2923398C2 (de) * 1979-06-06 1981-07-09 Mannesmann AG, 4000 Düsseldorf Vorrichtung zum Ausmessen einer gebogenen Stranggießkokille
JPS57171552A (en) * 1981-04-14 1982-10-22 Furukawa Electric Co Ltd:The Continuous casting device

Also Published As

Publication number Publication date
EP0143347A1 (fr) 1985-06-05
DE3342941C1 (de) 1984-12-06
JPS60133954A (ja) 1985-07-17
US4573521A (en) 1986-03-04
ATE31156T1 (de) 1987-12-15

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