EP0120338B1 - Verfahren zur Ermittlung der Kokillenwandabnutzung während des Giessprozesses und zur Ermittlung der Abhebung der Strangschale von der Kokilleninnenwand - Google Patents

Verfahren zur Ermittlung der Kokillenwandabnutzung während des Giessprozesses und zur Ermittlung der Abhebung der Strangschale von der Kokilleninnenwand Download PDF

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Publication number
EP0120338B1
EP0120338B1 EP84102183A EP84102183A EP0120338B1 EP 0120338 B1 EP0120338 B1 EP 0120338B1 EP 84102183 A EP84102183 A EP 84102183A EP 84102183 A EP84102183 A EP 84102183A EP 0120338 B1 EP0120338 B1 EP 0120338B1
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EP
European Patent Office
Prior art keywords
sensor
mould wall
wear
wall
mold
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
EP84102183A
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German (de)
English (en)
French (fr)
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EP0120338A1 (de
Inventor
Gerhard Stadtfeld
Burkhard Dr. Christmann
Jörg Dr. Weber
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.)
Licentia Patent Verwaltungs GmbH
Vodafone GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
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 Licentia Patent Verwaltungs GmbH, Mannesmann AG filed Critical Licentia Patent Verwaltungs GmbH
Priority to AT84102183T priority Critical patent/ATE25016T1/de
Publication of EP0120338A1 publication Critical patent/EP0120338A1/de
Application granted granted Critical
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    • 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

Definitions

  • the invention relates to a method according to the preamble of claim 1 and to the determination of the lifting of the strand shell from the mold inner wall.
  • the strand In the continuous casting of metals, the strand is produced by continuously pouring liquid material through a chute of the mold surrounded by the walls of the mold. As it exits the shaft, the strand consists of a solid shell and a liquid core. Further cooling outside the mold leads to complete solidification.
  • a system-specific limit e.g. 10 mm
  • the strand shell heats up again by supplying heat from the liquid strand core and expands at most until it touches the cooled mold wall again.
  • This process can be repeated several times in a strand cross-section as it passes through the mold, the position and size of the withdrawals in the shaft varying over time.
  • the gaps between the mold wall and the strand created by the lift-offs are partially filled - especially with small lift-offs (casting powder).
  • the mold shaft is designed conically for a global consideration of the shrinkage of the strand shell.
  • Taper is a critical parameter. If the taper is too low, the cooling can be reduced by lifting off, if the taper is too large, the friction between the strand and the corillem walls in the lower shaft area can become too great. For a large part of the casting programs there are empirical values that allow a satisfactory casting process.
  • the invention has for its object to provide a method with which the wear of the mold walls can be determined during the casting process, the lifting of the strand from the walls can also be determined from the result.
  • the object of determining the wear of the mold walls is achieved by the features listed in the characterizing part of patent claim 1.
  • FIG. 1 shows a mold with measuring sensors mounted in bores
  • FIG. 2 shows a mold wall with a measuring sensor in a continuous bore and a measuring sensor that measures in the area of critical wear.
  • FIG. 3 shows a mold wall with a measuring sensor in a continuous bore and a measuring sensor that measures in the area of critical wear.
  • the mold in openings 4.4 'eddy current distance sensors 3.3' are installed in openings.
  • the sensors are so far away from the strand surface 2 that it does not touch the sensors even when the mold wall is allowed to wear to the maximum extent.
  • the distance from the shaft surface sensors is given and known through the installation. This distance is denoted by L; it corresponds to zero mold wear, i. H. not worn out.
  • each distance measuring sensor determines the current distance A of the strand surface from the sensor and leads this to the elimination of the influence (temporary) lifting of the strand from the mold walls of a minimum value memory assigned to it, which respectively stores the smallest measured value supplied to it while deleting the last stored value saves.
  • the sensors can also be designed so that they only measure distance values in the area of critical wear with sufficient accuracy, cf. See Fig. 2. This enables a smaller and simpler design 5 in eddy current measuring sensors.
  • the measuring sensor opening 6 only has to be so deep that there is no more wall material (usually copper) between the measuring sensor 5 and the surface of the strand only when the wear values are critical.
  • the space between the sensor surface and the mold wall is filled with a non-magnetic, electrically non-conductive material 7, which has similar mechanical abrasion properties as the mold wall.
  • a significant improvement in the casting process is achieved by tracking the mold walls to the nominal geometry of the shaft, in which the measured wear values are fed to an adjusting device which shifts the mold walls in accordance with these values.
  • the conicity of the narrow surfaces of the mold shaft which is particularly important for the process, can be kept at the required value, particularly in the case of continuous slab casting plants.
  • a characteristic variable is determined from the measured lift-off values and is supplied to one or the conicity adjusting device mentioned above for the corresponding adjustment of the mold wall. This parameter is obtained by storing the maximum value of the lift-off values.
  • the conicity and possibly also the strand withdrawal speed should be reduced if the deformation is too great.
  • Some system states - such as the start of casting and very slow strand feed - require a different reaction from the adjusting device than an almost stationary operation. Therefore, the target values for the mold wall adjustment are determined with the aid of a computer from the measured values of the device, taking into account the relevant system parameters (strand length, take-off speed).
  • the measuring heads 8 are coupled directly to the mold wall 1.
  • the pulse-echo method is used.
  • the wear of the mold wall results from the transit time of the sound pulse reflected on the surface of the mold inner wall.
  • the reflection is influenced by the surface of the strand and the “lubricant layer” 9 between the surface of the strand and the shaft and can at times become very small.
  • a minimum value storage is therefore carried out here - analogous to the previous exemplary embodiment.
  • a determination of the strand lift is possible with sound if the space between the strand surface and the shaft is completely filled with casting powder.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
EP84102183A 1983-03-16 1984-03-01 Verfahren zur Ermittlung der Kokillenwandabnutzung während des Giessprozesses und zur Ermittlung der Abhebung der Strangschale von der Kokilleninnenwand Expired EP0120338B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84102183T ATE25016T1 (de) 1983-03-16 1984-03-01 Verfahren zur ermittlung der kokillenwandabnutzung waehrend des giessprozesses und zur ermittlung der abhebung der strangschale von der kokilleninnenwand.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3309885 1983-03-16
DE19833309885 DE3309885A1 (de) 1983-03-16 1983-03-16 Vorrichtung zur ermittlung der kokillenwandabnutzung waehrend des giessprozesses und verwendung derselben zur ermittlung der abhebung der strangschale von der kokilleninnenwand

Publications (2)

Publication Number Publication Date
EP0120338A1 EP0120338A1 (de) 1984-10-03
EP0120338B1 true EP0120338B1 (de) 1987-01-21

Family

ID=6193949

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84102183A Expired EP0120338B1 (de) 1983-03-16 1984-03-01 Verfahren zur Ermittlung der Kokillenwandabnutzung während des Giessprozesses und zur Ermittlung der Abhebung der Strangschale von der Kokilleninnenwand

Country Status (5)

Country Link
US (1) US4545420A (enrdf_load_stackoverflow)
EP (1) EP0120338B1 (enrdf_load_stackoverflow)
JP (1) JPS59169658A (enrdf_load_stackoverflow)
AT (1) ATE25016T1 (enrdf_load_stackoverflow)
DE (1) DE3309885A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008011277A1 (de) * 2008-02-27 2009-09-10 Siemens Aktiengesellschaft Kokille zum Vergießen von Flüssigmetall, Verfahren zur Ermittlung einer Füllstandshöhe von Flüssigmetall in einer Kokille, Steuereinrichtung und Speichermedium

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4774751A (en) * 1981-06-15 1988-10-04 Diffracto, Ltd. Electro-optical and robotic casting quality assurance
DE3908328A1 (de) * 1989-03-10 1990-09-13 Mannesmann Ag Einrichtung zur regelung der konizitaet
DE4117073A1 (de) * 1991-05-22 1992-11-26 Mannesmann Ag Temperaturmessung brammenkokille
US5477618A (en) * 1994-05-03 1995-12-26 Gibson; Stephen P. Sand core dimension checking apparatus
DE102007039882A1 (de) * 2007-04-26 2008-11-06 Sms Demag Ag Stranggießkokille
EP3135402B1 (de) * 2015-08-27 2018-07-25 Primetals Technologies Austria GmbH Kokille und verfahren zum überwachen einer kokille
DE102017205886A1 (de) * 2017-04-06 2018-10-11 Sms Group Gmbh Vorrichtung mit Verschleißteil und Messeinrichtung für Verschleiß
CN110355340B (zh) * 2019-08-14 2024-06-18 中国重型机械研究院股份公司 一种控制结晶器热调宽软夹紧力的智能系统及其使用方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3204460A (en) * 1962-08-13 1965-09-07 United States Steel Corp System for indicating the liquid level in a continuous-casting mold or the like
US3745828A (en) * 1972-02-09 1973-07-17 United States Steel Corp Temperature sensing device for continuouscasting molds
US4027233A (en) * 1973-07-23 1977-05-31 Eduard Ivanovich Shmakov Contactless inductance pickup for detecting the interface of two media
DE2447580A1 (de) * 1974-10-05 1976-04-08 Betr Forsch Inst Angew Forsch Verfahren und vorrichtung zur ueberwachung der erstarrung des stahles in einer stranggiesskokille
SU914173A1 (ru) * 1980-04-04 1982-03-23 Nii Tyazhelogo Mash Устройство для измерения конусности и износа стенок кристаллизатора1
JPS57127559A (en) * 1981-01-29 1982-08-07 Nippon Kokan Kk <Nkk> Detection of solidification state of ingot in mold for continuous casting machine
DE3110012C1 (de) * 1981-03-11 1982-11-04 Mannesmann AG, 4000 Düsseldorf Anordnung zur UEberwachung und Nachstellung der Neigung der Schmalseite einer Stranggiesskokille
JPS57171554A (en) * 1981-04-14 1982-10-22 Kawasaki Steel Corp Automatic controller for short side of mold
JPS58163561A (ja) * 1982-03-24 1983-09-28 Nippon Steel Corp 連続鋳造浸漬ノズル試験方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008011277A1 (de) * 2008-02-27 2009-09-10 Siemens Aktiengesellschaft Kokille zum Vergießen von Flüssigmetall, Verfahren zur Ermittlung einer Füllstandshöhe von Flüssigmetall in einer Kokille, Steuereinrichtung und Speichermedium

Also Published As

Publication number Publication date
JPS59169658A (ja) 1984-09-25
EP0120338A1 (de) 1984-10-03
DE3309885A1 (de) 1984-09-20
US4545420A (en) 1985-10-08
DE3309885C2 (enrdf_load_stackoverflow) 1987-06-25
ATE25016T1 (de) 1987-02-15

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