EP0379042B1 - Rühreinrichtung in Stranggiessanlage zum Rühren eines flüssigen Strangsumpfes im Kokillenausgangsbereich - Google Patents

Rühreinrichtung in Stranggiessanlage zum Rühren eines flüssigen Strangsumpfes im Kokillenausgangsbereich Download PDF

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Publication number
EP0379042B1
EP0379042B1 EP90100398A EP90100398A EP0379042B1 EP 0379042 B1 EP0379042 B1 EP 0379042B1 EP 90100398 A EP90100398 A EP 90100398A EP 90100398 A EP90100398 A EP 90100398A EP 0379042 B1 EP0379042 B1 EP 0379042B1
Authority
EP
European Patent Office
Prior art keywords
mould
mold
billet
agitating
cooling system
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 - Lifetime
Application number
EP90100398A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0379042A3 (en
EP0379042A2 (de
Inventor
Markus Schmid
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.)
Concast Standard AG
Original Assignee
Concast Standard 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 Concast Standard AG filed Critical Concast Standard AG
Priority to AT90100398T priority Critical patent/ATE82170T1/de
Publication of EP0379042A2 publication Critical patent/EP0379042A2/de
Publication of EP0379042A3 publication Critical patent/EP0379042A3/de
Application granted granted Critical
Publication of EP0379042B1 publication Critical patent/EP0379042B1/de
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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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/114—Treating the molten metal by using agitating or vibrating means
    • B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields

Definitions

  • the invention relates to a stirring device in a continuous casting installation for stirring a liquid strand sump according to the preamble of claim 1.
  • the stirring devices are often built into the mold.
  • the electromagnetic field must penetrate the mold wall, which usually consists of copper.
  • the magnetic field also has to penetrate a cooling water gap, boundary walls for the cooling water gap and for the stirrer housing, which causes high electrical outputs and correspondingly high operating costs.
  • a continuous casting mold which is designed as a composite body and consists of an upper and lower mold part.
  • the upper mold part has copper walls and the lower mold part has mold cavity walls made of antimagnetic material and is equipped with stirring coils.
  • This mold which is composed of two different metals in the mold cavity, can cause problems at the interface due to different expansion coefficients. At the interface, gap joints and bends can occur, which lead to difficulties starting up, string errors and breakthroughs.
  • the invention has for its object to provide a stirring device for stirring the liquid sump of a cast strand in the mold exit area, which eliminates the aforementioned disadvantages.
  • a high stirring effect should be achieved with a relatively low energy requirement and at the same time a quick and easy mold change with or without a stirrer change should be realized.
  • investment costs for mold stirrers are to be reduced and only a few new parts are required when installing stirrers in existing systems.
  • the stirring device according to the invention and the arrangement according to the invention on the mold table allow stirrers to be operated with low electrical outputs which achieve a high stirring effect.
  • the stirring device which oscillates with the mold table and which immediately follows the mold outlet brings sufficient stirring power or a rotational movement into the liquid sump inside the mold, so that there is no need for a stirrer in the mold itself. Chill mold changes can be carried out more quickly and easily without dismantling the stirrer, and old, stirrer-free molds can still be used when stirring devices are installed in existing systems. Only a few new parts are required for the stirrer assembly itself.
  • a particularly advantageous variant is to provide the mold table with support, centering and clamping devices for the stirring device.
  • the mold can be used independently of the support, centering and clamping devices for the stirrer Chill table with its own such facilities.
  • the existing, stirrer-free molds can be centered and tightened via an intermediate piece on the mold table.
  • the outer dimensions of the intermediate piece are generally larger than the outer dimensions of a support flange of the stirring device.
  • An optimal geometric shape of the stirrer with regard to wear, cooling and efficiency can be achieved if an air gap is provided between the stirrer and the cast strand and spray compartments of spray nozzles penetrate into this air gap.
  • the air gap can diverge in the direction of the run.
  • a high stirring effect in the strand at a relatively low electrical power can additionally be achieved if, according to one embodiment, the housing wall is made of stainless steel between the coils of the stirring device and the strand.
  • an exchangeable protective shield made of stainless steel between the stirrer and the strand surface.
  • This protective shield can overlap the mold tube or abut a mold tube on the end face and can be arranged to be exchangeable at the bottom.
  • Water cooling can also be provided between the stirring device and the protective shield.
  • stirrer is designed with coils for a mains frequency, preferably for 50 or 60 Hz.
  • the stirrer coils can be arranged in such a way that the stirring device generates a rotating field transverse to the strand withdrawal direction and applies a rotational movement to the liquid core of the strand, which runs essentially concentrically to the strand longitudinal axis.
  • the stirring device is mounted separately from the mold on the mold table, the stirrer is directly at the exit during casting arranged the mold tube.
  • the gap between the stirrer and the mold cannot be measured or can hardly be measured in many cases. It is preferably a few tenths of a mm to 5 mm and in exceptional cases can be up to 20 mm. Larger gaps, however, reduce the stirring effect within the mold and favor the entry of liquid steel between the mold and stirrer in the event of a strand break.
  • stirrer with a cooling system that is independent of the mold cooling.
  • the stirrer cooling system can advantageously be connected to the spray water cooling. Additional spray water cooling can be set up between the stirring device and the protective shield.
  • FIG. 1 an upper part of a vertical or sheet continuous casting system, preferably for billet, bloom or blank formats, etc., is shown.
  • a steel jet 3 feeds liquid steel to a mold 2, and a partially solidified strand 4 is drawn out at the lower end of the mold.
  • the mold 2 is supported via an intermediate piece 5 on a guide part 6 of the mold table 8.
  • a stirring device is designated, which immediately follows the mold cavity 11 of the oscillating mold.
  • the stirring device 10 is separated from the mold 2 and is held in position independently of this in the guide part 6 of the mold table 8 by means of centering devices 12.
  • the agitator is direction 10 carried by the mold table 8 or clamped directly to it.
  • the mold 2 has its own centering devices 15 and clamping devices 16. In this example, it is attached to the oscillating table 8 via an intermediate piece 5. However, it could also be centered and clamped directly on the oscillation table via a correspondingly large mold flange.
  • the outer dimensions 19 of the intermediate piece 5 are larger than the dimension 20 of the outer boundary of an aerofoil 7 of the stirring device 10.
  • An air gap 22 is provided between the stirrer 10 and the cast strand 4, which diverges strongly in the direction of the strand. Spray compartments 24 of spray nozzles 25 penetrate into this gap, which increases downwards.
  • An envelope 27 between the coils in the stirring device 10 and the strand 4 is made of stainless steel.
  • the stirrer 10 has stirring coils which are designed for a three-phase mains frequency, for example 50 or 60 Hz etc.
  • the stirring coils generally generate a rotating field transverse to the strand withdrawal direction 28, which sets the liquid core 29 of the strand 4 in rotation.
  • an exchangeable protective shield 30 or 30 ' is provided in these examples.
  • the protective shield 30 overlaps at its upper ends a copper pipe part 32 of the mold 2.
  • an open cooling device 31, 31' is provided by means of spray water.
  • the protective shield 30 'abuts the end face of a copper pipe part 32' of the mold 2.
  • the protective shields 30, 30 ' are fastened so that they can be replaced from below even in the installed state.
  • stirrer 10 and the mold 2 are installed independently of one another on the mold table, between the lower boundary surface 34 of the mold 2 and an upper boundary surface 35 of the stirring device 10 the smallest possible gap between a fraction of a mm and 5 mm is provided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Accessories For Mixers (AREA)
EP90100398A 1989-01-19 1990-01-10 Rühreinrichtung in Stranggiessanlage zum Rühren eines flüssigen Strangsumpfes im Kokillenausgangsbereich Expired - Lifetime EP0379042B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90100398T ATE82170T1 (de) 1989-01-19 1990-01-10 Ruehreinrichtung in stranggiessanlage zum ruehren eines fluessigen strangsumpfes im kokillenausgangsbereich.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH164/89 1989-01-19
CH164/89A CH678026A5 (fi) 1989-01-19 1989-01-19

Publications (3)

Publication Number Publication Date
EP0379042A2 EP0379042A2 (de) 1990-07-25
EP0379042A3 EP0379042A3 (en) 1990-12-19
EP0379042B1 true EP0379042B1 (de) 1992-11-11

Family

ID=4180719

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90100398A Expired - Lifetime EP0379042B1 (de) 1989-01-19 1990-01-10 Rühreinrichtung in Stranggiessanlage zum Rühren eines flüssigen Strangsumpfes im Kokillenausgangsbereich

Country Status (7)

Country Link
US (1) US5025853A (fi)
EP (1) EP0379042B1 (fi)
JP (1) JP2955315B2 (fi)
AT (1) ATE82170T1 (fi)
CH (1) CH678026A5 (fi)
DE (1) DE59000436D1 (fi)
ES (1) ES2036844T3 (fi)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4103963A1 (de) * 1991-02-09 1992-08-13 Kabelmetal Ag Verfahren zum kontinuierlichen stranggiessen von kupferlegierungen
AT404104B (de) * 1994-07-01 1998-08-25 Voest Alpine Ind Anlagen Stranggiesskokille mit einem einen magnetischen kreis umfassenden rührer
KR100376504B1 (ko) * 1998-08-04 2004-12-14 주식회사 포스코 연속주조방법및이에이용되는연속주조장치
US20090110892A1 (en) * 2004-06-30 2009-04-30 General Electric Company System and method for making a graded barrier coating
US20110048669A1 (en) * 2009-08-31 2011-03-03 Abb Inc. Electromagnetic stirrer arrangement with continuous casting of steel billets and bloom
WO2019113165A1 (en) * 2017-12-06 2019-06-13 The Suppes Family Trust Molded self-assembled electromagnet motors and devices
WO2020085775A1 (ko) * 2018-10-24 2020-04-30 주식회사 퓨쳐캐스트 가동형 전자기제어 조직제어모듈을 구비하는 다이캐스팅 장치
KR102121979B1 (ko) * 2018-10-24 2020-06-12 주식회사 퓨쳐캐스트 가동형 전자기제어 조직제어모듈을 구비하는 다이캐스팅 장치

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3167829A (en) * 1962-02-20 1965-02-02 Concast Ag Apparatus for continuous casting of metal
US3804147A (en) * 1971-03-30 1974-04-16 Etudes De Centrifugation Continuous rotary method of casting metal utilizing a magnetic field
US3967362A (en) * 1975-07-14 1976-07-06 United States Steel Corporation Continuous caster alignment method
FR2358222A1 (fr) * 1976-07-13 1978-02-10 Siderurgie Fse Inst Rech Nouveaux procede et dispositif pour le brassage electromagnetique de produits metalliques coules en continu
NO790471L (no) * 1978-02-18 1979-08-21 British Aluminium Co Ltd Stoepemetaller.
AT359225B (de) * 1978-03-23 1980-10-27 Voest Alpine Ag Drehfeld-stranggiesskokille
JPS5794458A (en) * 1980-12-03 1982-06-11 Mitsubishi Heavy Ind Ltd Electromagnetic stirrer in continuous casting machine
US4473105A (en) * 1981-06-10 1984-09-25 Olin Corporation Process for cooling and solidifying continuous or semi-continuously cast material
JPS58215254A (ja) * 1982-06-08 1983-12-14 Kawasaki Steel Corp 連続鋳造用鋳型の下方に配設される電磁攪拌装置
JPS59101261A (ja) * 1982-12-02 1984-06-11 Kawasaki Steel Corp 静磁場溶鋼流制動を行う連続鋳造方法
JPS60136845U (ja) * 1984-02-16 1985-09-11 株式会社神戸製鋼所 連続鋳造機の電磁撹拌用鋳型
JPS61186157A (ja) * 1985-02-14 1986-08-19 Mitsubishi Heavy Ind Ltd 電磁撹拌装置の支持方法

Also Published As

Publication number Publication date
DE59000436D1 (de) 1992-12-17
JP2955315B2 (ja) 1999-10-04
ATE82170T1 (de) 1992-11-15
JPH02229652A (ja) 1990-09-12
EP0379042A3 (en) 1990-12-19
ES2036844T3 (es) 1993-06-01
US5025853A (en) 1991-06-25
CH678026A5 (fi) 1991-07-31
EP0379042A2 (de) 1990-07-25

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