EP0850116A1 - Dispositif electromagnetique pour coquille de coulee en continu - Google Patents
Dispositif electromagnetique pour coquille de coulee en continuInfo
- Publication number
- EP0850116A1 EP0850116A1 EP96932449A EP96932449A EP0850116A1 EP 0850116 A1 EP0850116 A1 EP 0850116A1 EP 96932449 A EP96932449 A EP 96932449A EP 96932449 A EP96932449 A EP 96932449A EP 0850116 A1 EP0850116 A1 EP 0850116A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- continuous casting
- partial
- pairs
- mold
- casting 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.)
- Granted
Links
- 238000009749 continuous casting Methods 0.000 title claims abstract description 50
- 238000005266 casting Methods 0.000 claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 8
- 239000010959 steel Substances 0.000 claims abstract description 8
- 239000000571 coke Substances 0.000 claims description 12
- IHQKEDIOMGYHEB-UHFFFAOYSA-M sodium dimethylarsinate Chemical class [Na+].C[As](C)([O-])=O IHQKEDIOMGYHEB-UHFFFAOYSA-M 0.000 claims description 5
- 230000005294 ferromagnetic effect Effects 0.000 claims description 3
- 239000000155 melt Substances 0.000 description 29
- 239000002184 metal Substances 0.000 description 19
- 229910052751 metal Inorganic materials 0.000 description 19
- 238000003756 stirring Methods 0.000 description 19
- 230000005291 magnetic effect Effects 0.000 description 10
- 238000007654 immersion Methods 0.000 description 5
- 206010042674 Swelling Diseases 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000004907 flux Effects 0.000 description 4
- 150000002739 metals Chemical class 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 230000008961 swelling Effects 0.000 description 4
- 235000013162 Cocos nucifera Nutrition 0.000 description 3
- 244000060011 Cocos nucifera Species 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 238000013021 overheating Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 210000001787 dendrite Anatomy 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000013517 stratification Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- -1 steel Chemical class 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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
-
- 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
Definitions
- the invention relates to a stationary continuous casting mold, in particular for casting steel, with an electromagnetic device which comprises a plurality of partial stirrers which are arranged on the outer wall of the continuous casting mold at a distance from one another and are connected to an alternating electrical voltage with a corresponding phase position for generating a rotating electromagnetic force field .
- Stationary continuous casting molds are suitable for carrying out the method for casting steel in the immersion tube casting process, in which the immersion tube extending into the continuous casting mold is immersed in the melt. It is known to influence the solidification during the continuous casting of high-melting metals, such as steel, by generating rotating electromagnetic fields in the stationary continuous casting mold by stirring.
- a stirring device for stationary continuous casting molds with two part stirring devices which can be operated independently of one another and which are arranged one behind the other in the casting direction on the outer wall of the continuous casting mold is known, for example, from DE-OS 38 19492.
- the electromagnetic rotating fields are generated in the mold.
- this stirring device is intended to achieve a uniform, finer structural structure of the cast strand, a uniform distribution of non-metallic inclusions, better heat dissipation, etc.
- the stirring device (Herrmann, E., Manual of Continuous Casting, Aluminum-Verlag GmbH, Dusseldorf 1958, pages 417-429”) can be formed, for example, from a plurality of electromagnets made of horseshoe-shaped transformer sheets which are arranged vertically or horizontally on the wall of the Continuous casting mold are arranged.
- the induction flow goes from one leg of the horseshoe to the other through the molten metal.
- the molten metal passed through the mold is subjected to a continuous mechanical circulation flow due to the magnetic fluxes generated.
- the stirring device is operated such that the electromagnets, the magnetic field of which, for example, propagates in the direction of the vertical axis of the mold, are controlled in such a way that the direction of the maximum magnetic flux rotates about the vertical axis of the mold. This is intended to achieve a good circulation of the molten metal with good efficiency at the same time.
- Claim 1 specified features. Due to the characterizing features of subclaims 2 to 7, the inventive device of the stationary continuous casting coke can be designed in an advantageous manner.
- the invention provides that the electromagnetic device comprises at least two pairs of partial stirrers and the partial stirrers of each pair are arranged opposite one another, namely rotated relative to one another by an x-shaped angle, the rotation taking place in a plane parallel to the pouring direction. All pairs are arranged essentially at the same height.
- the electromagnetic devices each lead to a helical upward rotational movement of the molten metal in the central area of the mold, which causes superheated steel to move upward from the lower area of the mold, which in turn causes the melt to solidify between the ceramic inlet pipe and the mold wall (so-called bridging) prevented.
- the electromagnetic device according to the invention results in horizontal and vertical rotation of the melt. These rotational movements generated in the melt effectively prevent the formation of white bands (bands with negative segregation).
- the electromagnetic device also leads to an improvement in the degree of purity of the cast strand, since the reduction is more vertical
- the electromagnetic device according to the invention has a particularly good effect if the amount of the angle by which the partial stirrers are rotated relative to the pouring direction is in the range between and 30 ° and 60 °.
- the partial stirrers are designed as coils with a ferromagnetic U-shaped core. As a result, a strong magnetic field can be generated with little effort in the stationary caster.
- an easy-to-use adaptation to different casting conditions is achieved by means of an actuator provided, by means of which the partial stirrers of each pair can be rotated against one another during operation.
- the electromagnetic device can thus be optimally adjusted with little effort.
- the partial stirrers are expediently mounted in rotatable brackets which can be adjusted by an actuator.
- the control is usually done either manually or using a specified setting algorithm.
- the frequency of the swellings on the surface of the melt can serve as a manipulated variable, however, the depth of the suction funnel of the metal melt that forms on the immersion tube can also be used.
- Fig. 1 is a schematic spatial representation of a stationary
- Fig. 2 is a plan view of the stationary shown in Fig. 1
- Fig. 3 is a schematic spatial representation of a stationary
- a stationary continuous casting mold 10 for the continuous casting of metals has a continuous casting mold which is formed by four mold walls 11, 12 made of metal, namely two broad sides 12 and two narrow sides 11.
- the continuous casting coconut 10 is open at the top and bottom; the lower cross-sectional area through which the metal strand leaves the mold is normally less than or equal to the upper cross-sectional area of the continuous casting mold 10.
- Mold walls 11, 12 enclose the mold cavity 13, into which a dip tube 14 protrudes, which has one or more outflow openings at the free end.
- Molten metal is located in the mold cavity 13 and can be fed continuously via the dip tube 14 and is continuously discharged through the lower mold outlet opening.
- the molten metal solidifies in contact with the cooled mold walls 11, 12 in the continuous casting mold 10, so that a shell is formed.
- the thickness of this shell gradually increases as the metal passes through the continuous casting coconut 10 until it emerges as a strand from the lower part of the continuous casting cocily 10.
- the shell must have a sufficient thickness upon exiting the continuous casting coke 10 because at that point the strand is not yet completely solidified in order to retain the molten core which finally solidifies and forms a solid strand.
- the casting level which is set in the mold cavity 13 lies above the outflow opening of the dip tube 14 and is covered with casting powder.
- the pouring memever serves as a lubricant and reduces the friction between the outer surface of the melt and the mold walls 11, 12.
- the continuous casting mold 10 is provided with an electromagnetic device 20, which consists of the partial stirrers 21 - 24 arranged on the mold walls 11, 12 is formed.
- the partial stirrers 21-24 are connected to form pairs 21, 24 and 22, 23.
- two pairs 21, 24 and 22, 23 are provided, which are arranged to the right and left to the pouring direction A, the partial stirrers of a pair 21, 24 and 22, 23 each located opposite one another on the broad sides 12 of the continuous casting coke 10.
- FIG. 1 reveals, the partial agitators 21, 24 and 22, 23 of a pair are rotated in an X-shaped manner parallel to one another in a plane parallel to the pouring direction.
- the angle by which the partial stirrers of a pair are each rotated relative to one another is preferably in the range between and 30 ° and 60 °. in the exemplary embodiment, the partial stirrers of a pair are each rotated by 45 ° relative to one another, ie the rotation of the partial stirrers of a pair is (2 times 45 ° equal) 90 °.
- the exact angle depends in a known manner on the phase position of the alternating voltage, which ensures the excitation of the partial stirrers 21-24.
- the partial stirrers 21-24 are connected to alternating voltages which differ in the order of the partial stirrers 21-24 by a phase difference of 45 °, the angle by which the partial stirrers of a pair are to be arranged rotated relative to one another results , a value of 45 °.
- Each partial stirrer 21 - 24 has a ferromagnetic U-shaped core.
- the core is an iron core which is made from dynamo sheet and carries coils made of copper wires.
- the cross section of the cores is rectangular; the Pohl shoes rest on the Kokiilenwallen 11, 12.
- the generated magnetic fields of the partial stirrers 21-24 penetrate through the mold walls 11, 12 into the mold cavity 13 and penetrate the metal melt.
- opposing force fields are induced in the left and right mold halves, which produce a flow in the melt rotating from the center to the left outer wall in the left mold half and a flow rotating from the center to the right wall in the right mold half.
- the vertical components of the force fields are directed upwards in the central part of the mold; however, the horizontal vector components run in opposite directions for both mold halves.
- the distance between the pairs of partial stirrers 21, 24 and 22, 23 is selected so that the melt performs a stirring movement in the area of the dip tube without the melt entering the mold through the dip tube being slowed down in the dip tube. Outside the immersion tube, the electromagnetic braking effect of the device 20 is quite desirable.
- the electromagnetic device 20 makes it possible to reverse the vertical flow directions in the stationary continuous casting coke with the advantages mentioned, while at the same time stirring the melt horizontally. Due to the simultaneous horizontal stirring in the left and right part of the mold, temperature stratification is counteracted and the overheating heat is evenly reduced. Dendrites that form are stirred away and then accumulate as globulites on the solidification front of the melt. Due to the horizontal and vertical stirring of the melt, the formation of negative segregations (so-called white bands) is prevented.
- Fig. 2 shows a plan view of the stationary continuous casting coke shown in Fig. 1.
- the connection diagram of the partial agitators 21 -24 of the electromagnetic device 20 is shown.
- the pairs 21, 24 and 22, 23 of the electromagnetic device 20 are each electrically connected in series.
- the upper connections of the coils 25, 27 and 26, 28 are connected to one another.
- the partial stirrers of a pair 21, 24 and 22, 23 can be operated on a normal AC voltage source.
- an actuator (not shown) is provided, by means of which the partial stirrers of each pair 21, 24 and 22, 23 can be rotated relative to one another during operation in order to optimally adjust the electromagnetic device 20.
- the partial stirrers 21, 24 and 22, 23 are expediently mounted in rotatable brackets which can be adjusted by the actuator.
- the control is usually carried out by a microprocessor, either regulated by hand or using a predetermined setting algorithm.
- the frequency of the swells on the surface of the melt can serve as the manipulated variable, but the depth of the suction funnel of the metal melt that forms on the immersion tube can also be used.
- the electromagnetic device 20 can also be constructed from a multiplicity of pairs of partial stirrers 21, 24 and 22, 23, each of which corresponds to the corresponding ones described above in a subspace of the stationary continuous casting coke generate magnetic rotating fields with a corresponding sense of rotation, which can be set against one another by controlling the partial stirring pairs as well as a corresponding angular rotation of the partial stirrers of a pair 21, 24 and 22, 23.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Confectionery (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19533577 | 1995-08-29 | ||
DE19533577A DE19533577C1 (de) | 1995-08-29 | 1995-08-29 | Elektromagnetische Einrichtung für eine Stranggießkokille |
PCT/DE1996/001554 WO1997007911A1 (fr) | 1995-08-29 | 1996-08-13 | Dispositif electromagnetique pour coquille de coulee en continu |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0850116A1 true EP0850116A1 (fr) | 1998-07-01 |
EP0850116B1 EP0850116B1 (fr) | 1999-03-24 |
Family
ID=7771842
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96932449A Expired - Lifetime EP0850116B1 (fr) | 1995-08-29 | 1996-08-13 | Dispositif electromagnetique pour coquille de coulee en continu |
Country Status (9)
Country | Link |
---|---|
US (1) | US6021842A (fr) |
EP (1) | EP0850116B1 (fr) |
JP (1) | JP2942361B2 (fr) |
KR (1) | KR100264946B1 (fr) |
CN (1) | CN1072058C (fr) |
AT (1) | ATE177975T1 (fr) |
AU (1) | AU7124796A (fr) |
DE (2) | DE19533577C1 (fr) |
WO (1) | WO1997007911A1 (fr) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19738821A1 (de) * | 1997-09-05 | 1999-03-11 | Aeg Elotherm Gmbh | Vorrichtung zum elektromagnetischen Rühren einer Metallschmelze |
US6845809B1 (en) | 1999-02-17 | 2005-01-25 | Aemp Corporation | Apparatus for and method of producing on-demand semi-solid material for castings |
US6796362B2 (en) | 2000-06-01 | 2004-09-28 | Brunswick Corporation | Apparatus for producing a metallic slurry material for use in semi-solid forming of shaped parts |
US6402367B1 (en) | 2000-06-01 | 2002-06-11 | Aemp Corporation | Method and apparatus for magnetically stirring a thixotropic metal slurry |
US6432160B1 (en) | 2000-06-01 | 2002-08-13 | Aemp Corporation | Method and apparatus for making a thixotropic metal slurry |
US6399017B1 (en) * | 2000-06-01 | 2002-06-04 | Aemp Corporation | Method and apparatus for containing and ejecting a thixotropic metal slurry |
DE102009029889A1 (de) * | 2008-07-15 | 2010-02-18 | Sms Siemag Ag | Elektromagnetische Bremseinrichtung an Stranggießkokillen |
DE102009056001A1 (de) | 2009-08-28 | 2011-03-03 | Sms Siemag Ag | Verfahren zum Gießen von flüssigen Metallen |
US20110048669A1 (en) * | 2009-08-31 | 2011-03-03 | Abb Inc. | Electromagnetic stirrer arrangement with continuous casting of steel billets and bloom |
DE102012213746A1 (de) | 2012-08-02 | 2014-02-06 | Sms Siemag Ag | Vorrichtung zur geformten Ausbringung zumindest teilweise erstarrten Metalls, insbesondere Stranggießkokille, und Verfahren zum Betreiben einer solchen Vorrichtung |
GB201305822D0 (en) * | 2013-03-28 | 2013-05-15 | Pavlov Evgeny | Improvements in and relating to apparatus and methods |
EP3453472A1 (fr) | 2014-05-21 | 2019-03-13 | Novelis Inc. | Commande d'écoulement de métal fondu sans contact |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56158259A (en) * | 1980-05-13 | 1981-12-05 | Kawasaki Steel Corp | Method for accelerating floating of nonmetallic inclusion in tundish |
JPS5970445A (ja) * | 1982-10-15 | 1984-04-20 | Nippon Steel Corp | 連続鋳造設備用電磁撹拌装置 |
JPS6040654A (ja) * | 1983-08-12 | 1985-03-04 | Mitsubishi Heavy Ind Ltd | モ−ルド内電磁撹拌装置 |
JPS60234757A (ja) * | 1984-05-04 | 1985-11-21 | Mitsubishi Heavy Ind Ltd | モ−ルド内の電磁撹拌装置 |
DE3819492A1 (de) * | 1988-06-08 | 1989-12-14 | Voest Alpine Ind Anlagen | Knueppel- bzw. vorblock-stranggiesskokille |
JPH0673722B2 (ja) * | 1988-09-09 | 1994-09-21 | 新日本製鐵株式会社 | 連続鋳造方法 |
-
1995
- 1995-08-29 DE DE19533577A patent/DE19533577C1/de not_active Expired - Fee Related
-
1996
- 1996-08-13 KR KR1019970709897A patent/KR100264946B1/ko not_active IP Right Cessation
- 1996-08-13 CN CN96196594A patent/CN1072058C/zh not_active Expired - Fee Related
- 1996-08-13 AU AU71247/96A patent/AU7124796A/en not_active Abandoned
- 1996-08-13 EP EP96932449A patent/EP0850116B1/fr not_active Expired - Lifetime
- 1996-08-13 WO PCT/DE1996/001554 patent/WO1997007911A1/fr active IP Right Grant
- 1996-08-13 DE DE59601517T patent/DE59601517D1/de not_active Expired - Fee Related
- 1996-08-13 JP JP9509694A patent/JP2942361B2/ja not_active Expired - Fee Related
- 1996-08-13 AT AT96932449T patent/ATE177975T1/de not_active IP Right Cessation
- 1996-08-13 US US09/029,564 patent/US6021842A/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9707911A1 * |
Also Published As
Publication number | Publication date |
---|---|
AU7124796A (en) | 1997-03-19 |
KR100264946B1 (ko) | 2000-09-01 |
CN1072058C (zh) | 2001-10-03 |
JPH11500362A (ja) | 1999-01-12 |
EP0850116B1 (fr) | 1999-03-24 |
ATE177975T1 (de) | 1999-04-15 |
DE19533577C1 (de) | 1996-10-24 |
DE59601517D1 (de) | 1999-04-29 |
WO1997007911A1 (fr) | 1997-03-06 |
JP2942361B2 (ja) | 1999-08-30 |
CN1194601A (zh) | 1998-09-30 |
KR19990028576A (ko) | 1999-04-15 |
US6021842A (en) | 2000-02-08 |
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