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EP0592360A1 - Machine pour la coulée continue verticale dans un champs magnétique - Google Patents

Machine pour la coulée continue verticale dans un champs magnétique Download PDF

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Publication number
EP0592360A1
EP0592360A1 EP93810672A EP93810672A EP0592360A1 EP 0592360 A1 EP0592360 A1 EP 0592360A1 EP 93810672 A EP93810672 A EP 93810672A EP 93810672 A EP93810672 A EP 93810672A EP 0592360 A1 EP0592360 A1 EP 0592360A1
Authority
EP
European Patent Office
Prior art keywords
water
cooling water
guide surface
casting machine
strand
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
EP93810672A
Other languages
German (de)
English (en)
Other versions
EP0592360B1 (fr
Inventor
Georges Berclaz
Bertrand Carrupt
Miroslaw Plata
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.)
3A Composites International AG
Original Assignee
Alusuisse Lonza Services Ltd
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 Alusuisse Lonza Services Ltd filed Critical Alusuisse Lonza Services Ltd
Publication of EP0592360A1 publication Critical patent/EP0592360A1/fr
Application granted granted Critical
Publication of EP0592360B1 publication Critical patent/EP0592360B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B22D11/01—Continuous casting of metals, i.e. casting in indefinite lengths without moulds, e.g. on molten surfaces
    • B22D11/015—Continuous casting of metals, i.e. casting in indefinite lengths without moulds, e.g. on molten surfaces using magnetic field for conformation, i.e. the metal is not in contact with a mould
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/049—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for direct chill casting, e.g. electromagnetic casting

Definitions

  • the invention relates to a casting machine with at least one precisely and reproducibly oriented, water-cooled mold for the continuous casting of a vertical strand in the magnetic field of a closed, partially shielded inductor, at an acute angle via at least one guide surface to form a water film on the strand directed cooling water channels and a corresponding, lowerable approach floor per mold.
  • the invention further relates to a method for cooling a strand in a casting machine.
  • continuous casting processes also called continuous casting processes, metals are cast in the form of bars or bolts several meters long, which are used as primary material for various subsequent processing steps, such as for pressing, rolling or forging.
  • the most important link in a continuous casting machine are molds, which determine the cross section of the cast strand in conventional processes. Depending on the number of cast strands, a casting machine is equipped with a corresponding number of lowerable approach floors, which are firmly connected to a casting table.
  • the metal on the start-up floors begins to solidify. These are cooled and lowered at such a speed that the solidus line of the solidifying metal always remains within the mold frame.
  • the casting process is uninterrupted within a predetermined length of a strand.
  • the most important parameters of continuous casting include a correctly controlled lowering speed and the cooling of the metal in the right place and with the right intensity. These parameters have a strong influence on the surface of the ingot. If the parameters are controlled poorly, segregation, melt leakage through the solidified shell, tearing or lime binding can occur.
  • Magnetic field casting which has only recently reached industrial maturity, is based on the complete elimination of mechanical contact between the mold and the solidifying metal.
  • the liquid metal is kept exactly in the cross-sectional shape of the strand by controllable electromagnetic forces.
  • the starting phase is very important for magnetic field casting because the solidification front is held in a narrow mold height range of around 10 mm. This is necessary because with an EMC mold, the magnetic forces have to compensate for the metallostatic pressure of the melt above the solidification front. Therefore, complete control of the cooling, especially during the start-up phase, is essential.
  • the lowering speed and the cooling of a certain alloy and ingot dimensioning have to be optimized as a function of time.
  • the inventors have set themselves the task of creating a casting machine of the type mentioned which, thanks to its simpler design and lower losses of electromagnetic energy from the molds, is more economical both in terms of the production costs and in terms of the operating costs.
  • the mold should be flexible in the application of cooling water and should be cooled using a process that can be used more gently than before.
  • the object is achieved according to the invention in that the guide surface (s) of the mold for the cooling water consists of an insulating material and the electromagnetic shield is internally cooled, at least in the active area.
  • the mold housing consists of a multi-edged, Appropriately about 3 mm thick perforated plate, with welded side walls.
  • the expensive metal moldings which are solid and usually made of aluminum, can be made from a stainless steel sheet metal housing, the same material as the shield be.
  • molded parts made of plastic can be inserted into the sheet metal housing, which brings enormous advantages in terms of processing technology and cost.
  • the corrosion problems mentioned above are completely eliminated.
  • bent mold housing Further advantages of the bent mold housing are that the loss of electromagnetic energy is less and the largely one-piece embodiment does not cause any sealing problems.
  • the guide surface for the cooling water of the mold which consists of an insulating material according to the invention, is preferably the surface of a separately and expediently interchangeable deflection plate.
  • the continuous intensive cooling allows production from plastic, which is also a processing-technically simple and extremely cheap embodiment.
  • the baffle plate is preferably displaceable and / or pivotable. The position of the baffle plate can be adjusted by means known per se.
  • the cooling water hitting in the unchangeable direction can thus be deflected within a certain angular range.
  • the impact height of the water curtain formed on this guide surface and sprayed onto the strand can be set, for example over a range from 5 to 20 mm with a mold height which cannot be adjusted.
  • the cooling water curtain can be applied with simple means where it can really have an optimal effect.
  • the uniform formation of a water film on the guide surface of the baffle can be further improved by the fact that longitudinal grooves are formed.
  • longitudinal flow here means the flow direction of the cooling water.
  • Hard aluminum alloys for example, are cast at a lower lowering speed, which means that less cooling water is required.
  • the water hits the guide surface with too little pressure at too low a pressure, the cooling water runs off without film formation and can already on the already sensitive strands do not develop an optimal cooling effect.
  • a support plate can therefore be formed in the mold under the baffle plate or under the emerging cooling water, which is longer compared to the baffle plate, that is, it leads closer to the strand.
  • the cooling water is sprayed onto the support plate, the guide surface of the deflection plate is little or not wetted at lower pressure.
  • the surface of the support plate made of the same material as the deflection plate and facing the deflection plate is also designed as a guide surface for cooling water.
  • This support plate which is preferably interchangeable like the baffle plate, is likewise preferably displaceable and / or pivotable, expediently with the same drive elements as the baffle plate.
  • the level of the cooling water curtain hitting the strand can only be varied with a movable support plate.
  • the support plate can have holes in sensitive metal strands or have slots for draining cooling water. Because the cooling water discharged in this way never hits the hot strand, the cooling effect can be further reduced.
  • the deflection and the support plate are at least partially arranged between the inductor and the electromagnetic shielding, they cannot heat up due to the electromagnetic action, they consist of an insulating material, preferably of plastic, for example polyethylene or polypropylene.
  • the lime formation is significantly less than on a guide surface of a shield of a previously known type.
  • a U-shaped or V-shaped bent plate through which cooling water flows, that is to say internally cooled, is arranged, which, like the shielding body lying outside the active area of the inductor, preferably consists of stainless steel.
  • the laterally closed shield which preferably consists of about 1 to 2 mm thick, INOX sheets, only acts as a functional part if an insert or coating made of a material that shields better electromagnetically is arranged. Otherwise the bent stainless steel sheet has a purely protective and supporting function.
  • the shielding from the bent steel sheet can be multiplied by a factor of several hundred, depending on the material and thickness.
  • An insert or coating made of silver is expediently 0.05 to 0.2 mm thick, made of copper 0.2 to 0.4 mm and brass 0.5 to 2 mm, depending on the specific absorbency, the thickness of this layer being continuous or can gradually increase from bottom to top.
  • the Solution of the task according to the invention characterized in that the water-bearing guide surface is continuously shifted back and forth in a predetermined rhythm and / or pivoted, and thereby the water curtain independent of the electromagnetic shielding is moved up and down the strand over a certain height.
  • the water-bearing guide surface is preferably moved sinusoidally, in particular with a time period of 1 to 3 seconds per half-wave.
  • the water curtain on the strand preferably performs an up and down movement of 5 to 20 mm.
  • the movement of the water-bearing guide surface is preferably carried out with a pneumatic, hydraulic or electromagnetic drive, controlled by a microprocessor.
  • the cooling water is expediently sprayed on with a constant pressure in the range from 0.01 to 0.5 bar, starting with the lowering of the start-up floor, which corresponds to about 0 to 3 minutes after the start of the pouring. Because the start-up phase is particularly critical, the movement of the water-bearing guide surface can be continued for 3 to 7 minutes in practice. Of course, the movement of the guide surface is only stopped if this allows the sensitivity of the alloy.
  • the strand can be vibrated electromagnetically during cooling, in particular continuously.
  • the inventive design of the mold housing as a bent sheet, in particular a perforated sheet made of stainless steel, is not inevitably bound to the guiding surface for the cooling water and the internally cooled shield, nor is it bound to that of the active area of the electromagnetic shield in the form of a U or V-shaped sheet of stainless steel with an insert or coating.
  • Fig. 1 shows a known basic principle of a casting machine for vertical magnetic field continuous casting.
  • a casting machine can comprise one or more molds 10.
  • a closed-circuit inductor 12 for a medium-frequency high-voltage system generates a magnetic field and thereby the force in the strand 14 which prevents the cast metal from touching the mold inner wall 16.
  • a wedge-shaped electromagnetic shield 18 partially shields the inductor 12 and thereby reduces the magnetic field in the upward direction. Finally, the shield 18 determines the zone in which the cooling water 20 is in shape a cooling water curtain 22 sprayed onto the strand 14.
  • a start-up floor 24 is mounted on an invisible casting table.
  • the start-up floor 24 forms the foot 26 of the cast strand 14 during the starting phase and supports it during the entire casting phase.
  • This basic principle of continuous magnetic field casting according to FIG. 1 is improved according to the invention with regard to the guide surface 28 for the cooling water 20, the active region 30 of the electromagnetic shielding 18 and the shaped, solidly constructed mold housing 32, but is otherwise retained essentially unchanged.
  • FIG. 2 shows an approximately 3 mm thick stainless steel sheet 34 (INOX) for producing a mold housing 32 by folding and welding on side walls.
  • the steel sheet 34 already includes holes 34 with a diameter of about 3 mm, which are later used for the outlet of the cooling water, at regular intervals a of about 10 mm.
  • the mold 10 of a casting machine shown in FIG. 3 comprises a mold housing 32 which is bent several times and is made of a stainless steel sheet 34.
  • the interior formed is filled with cooling water 20 and provided with a water distributor block 38 made of plastic.
  • An electromagnetic shield 18 made of stainless steel has two inner grooves 42 for inserting the steel plates 34 at the front end of the mold housing 32.
  • the steel plates 34 and the water distributor block 38 made of plastic are penetrated by a bolt 44, on which a screw 46 in the electromagnetic shield 40 attacks and tightens the water distributor block 38 and thus the steel sheet 34.
  • the water distributor block 38 has a relatively deep groove 50, from which a (Fig. 2) cooling water channels 52 are formed, which open into a hole 36 in the steel sheet 34.
  • the direction of the exiting cooling water 20 is determined by the direction of the cooling water channels 52.
  • the water distributor block 38 can also be removed or replaced.
  • molded plastic blocks 58, 60 are connected to the mold housing 22 via a screwed-on clamp 54 and a bevel 56.
  • a circular, plate-shaped inductor 12 which in the present case consists of copper, is screwed to the plastic block 58 with the interposition of a temperature-resistant insulation layer 62.
  • a plastic deflection plate 66 for the cooling water 20 is arranged in a recess in the plastic block 60.
  • An inflatable bellows 68 displaces, depending on the pressure, a sealing washer 70 with a push rod 72 which passes through a corresponding bore in the plastic block 60 and the fold 56.
  • the deflecting plate 66 is articulated on this push rod 72.
  • With a spring 74 also fastened to the push rod 72 the deflection plate 66 is pivoted against the U-shaped shielding plate 76 of the electromagnetic shielding 18.
  • the electromagnetic shielding device 18 is internally cooled with water 78 at least in the area of the U-shaped shielding plate 76 because the cooling water 20 for the strand 14 does not come into external contact with the electromagnetic shielding 18, in particular the shielding plate 76.
  • the cooling water 20 strikes the guide surface 80 of the baffle plate 66 at an acute angle. flows with the formation of a water film along this guide surface, forms a homogeneous cooling water curtain 22 when detached from the baffle plate, which in turn acts on the strand 14 to be cooled.
  • the baffle 66 is drawn in two extreme positions.
  • the water curtain can appear on the strand 14 in any adjustable position within a height h of 5 to 20 mm, in particular 5 to 10 mm. This means that the mold 10 is very flexible even with rigid electromagnetic shielding. However, the water curtain can also be raised and lowered continuously, for example in the form of a sinusoidal movement.
  • a support plate 82 which is likewise pivotably connected to the push rod 72, is arranged.
  • This plastic support plate 82 is used to distribute cooling water 20 flowing out at low pressure, for example less than 0.05 bar. The cooling water does not reach the guide surface 80 of the baffle 66. So that the cooling water 20 flowing off as a film on the guide surface 84 of the support plate 82 reaches the strand 14, the support plate 82 is longer than the deflection plate 66 and extends into the nearer region of the strand 14.
  • Holes 86 or slots are formed in the support plate 82 so that part of the cooling water can be drained off without reaching the strand 14.
  • An insert plate 88 made of copper is clamped in the shielding plate 76 and has a high degree of absorption for the magnetic field generated by the inductor 12.
  • two copper sheets are connected to each other by soldering, riveting or gluing, which means that more shielding is provided in this area.
  • a flange 90 is fastened with an inlet opening 92 for the cooling water 20, for example with screws.
  • a large chamber 93 and a small chamber for the cooling water 20 which is identical to the groove 50 in the water distributor block 38 are thereby formed. With the flange 90, the cooling water 20 can be introduced into the cooling water channels 52 more smoothly.
  • FIG. 5 shows a detail with respect to the active zone of the shield 18, which is formed by the shield plate 76 bent in a U-shape and fastened to the shield body.
  • 0.3 mm thick coatings 94 made of copper, which are of different lengths, are applied to the two legs of the shielding plate 76. This creates a graded effective electromagnetic shielding, which - as in conventional embodiments - is stronger at the top than at the bottom.
  • a variant is shown in Fig. 6.
  • a part 94 of the shielding plate 76 has a coating 94 which becomes thicker from bottom to top and which produces a shielding effect which increases continuously from bottom to top.
  • FIG. 7 is an insert plate 88 bent up to the longitudinal center for a U or V-shaped shielding plate 76 (FIGS. 3, 4).
  • the electromagnetic shielding effect is equivalent to FIG. 5.
  • FIG. 8 shows two bent insert sheets 88 lying one on top of the other, which result in a finer gradation compared to FIG. 7.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Heat Treatment Of Articles (AREA)
  • Moulding By Coating Moulds (AREA)
  • Casting Devices For Molds (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Dc Machiner (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
EP93810672A 1992-10-06 1993-09-22 Machine pour la coulée continue verticale dans un champs magnétique Expired - Lifetime EP0592360B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3116/92 1992-10-06
CH03116/92A CH688129A5 (de) 1992-10-06 1992-10-06 Giessmaschine fuer das vertikale Stranggiessen in einem Magnetfeld.

Publications (2)

Publication Number Publication Date
EP0592360A1 true EP0592360A1 (fr) 1994-04-13
EP0592360B1 EP0592360B1 (fr) 1998-08-12

Family

ID=4248961

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93810672A Expired - Lifetime EP0592360B1 (fr) 1992-10-06 1993-09-22 Machine pour la coulée continue verticale dans un champs magnétique

Country Status (15)

Country Link
US (1) US5390725A (fr)
EP (1) EP0592360B1 (fr)
JP (1) JPH06210405A (fr)
AT (1) ATE169532T1 (fr)
AU (1) AU662244B2 (fr)
CA (1) CA2107187A1 (fr)
CH (1) CH688129A5 (fr)
CZ (1) CZ207193A3 (fr)
DE (1) DE59308858D1 (fr)
ES (1) ES2119880T3 (fr)
HU (1) HU215428B (fr)
IS (1) IS1718B (fr)
NO (1) NO302220B1 (fr)
RU (1) RU2113931C1 (fr)
ZA (1) ZA937029B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110976799A (zh) * 2019-11-15 2020-04-10 芜湖新兴铸管有限责任公司 冷却段密封板装置及降低滴落水量对冷却段影响的方法

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE512774C2 (sv) * 1998-03-06 2000-05-08 Abb Ab Anordning för gjutning av metall
JP3420966B2 (ja) * 1999-03-03 2003-06-30 新日本製鐵株式会社 溶融金属の連続鋳造装置
RU2160177C1 (ru) * 1999-10-21 2000-12-10 Закрытое акционерное общество "ЭлектроМагнитные системы и Технологии" Устройство для перемешивания расплавленного металла в кристаллизаторе
AU2002220397A1 (en) * 2000-11-15 2002-05-27 Alcan International Limited Process of and apparatus for ingot cooling during direct casting of metals
DE102005042370A1 (de) * 2005-09-07 2007-03-15 Sms Demag Ag Bauteil für eine Stranggießkokille und Verfahren zur Herstellung des Bauteils
JP5668426B2 (ja) * 2010-11-18 2015-02-12 大同特殊鋼株式会社 Ｓｍ−Ｆｅ−Ｎ系磁石用薄帯の製造方法
CN111286576A (zh) * 2020-03-26 2020-06-16 山东泰山钢铁集团有限公司 一种弧度倒角结晶器连铸机生产不锈钢板坯的方法
WO2022010724A1 (fr) * 2020-07-10 2022-01-13 Wagstaff, Inc. Appareil et procédé pour motif de pulvérisation d'eau de refroidissement de coulée à refroidissement direct
CN119076332B (zh) * 2024-09-09 2025-09-05 河海大学 一种水下缝隙喷涂方法及喷涂机器人

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0015870A1 (fr) * 1979-03-07 1980-09-17 Schweizerische Aluminium AG Coquille électromagnétique pour la coulée continue
EP0062606A1 (fr) * 1981-04-02 1982-10-13 Schweizerische Aluminium Ag Dispositif pour refroidir une barre de coulée pendant la coulée continue
EP0100289A2 (fr) * 1982-07-23 1984-02-08 Cegedur Societe De Transformation De L'aluminium Pechiney Procédé de coulée électromagnétique de métaux dans lequel on fait agir au moins un champ magnétique différent du champ de confinement
EP0229589A1 (fr) * 1985-11-25 1987-07-22 Schweizerische Aluminium Ag Dispositif et procédé de coulée continue de métaux
EP0372947A2 (fr) * 1988-12-08 1990-06-13 Alcan International Limited Lingotière de coulée continue à refroidissement direct avec ajustement contrôlé du point d'impact du réfrigérant

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU330695A1 (ru) * 1970-02-02 1981-10-07 Kozheurov V.R.,Su Электромагнитный кристаллизатор
JPH01215439A (ja) * 1988-02-25 1989-08-29 Sumitomo Light Metal Ind Ltd 電磁場鋳造法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0015870A1 (fr) * 1979-03-07 1980-09-17 Schweizerische Aluminium AG Coquille électromagnétique pour la coulée continue
EP0062606A1 (fr) * 1981-04-02 1982-10-13 Schweizerische Aluminium Ag Dispositif pour refroidir une barre de coulée pendant la coulée continue
EP0100289A2 (fr) * 1982-07-23 1984-02-08 Cegedur Societe De Transformation De L'aluminium Pechiney Procédé de coulée électromagnétique de métaux dans lequel on fait agir au moins un champ magnétique différent du champ de confinement
EP0229589A1 (fr) * 1985-11-25 1987-07-22 Schweizerische Aluminium Ag Dispositif et procédé de coulée continue de métaux
EP0372947A2 (fr) * 1988-12-08 1990-06-13 Alcan International Limited Lingotière de coulée continue à refroidissement direct avec ajustement contrôlé du point d'impact du réfrigérant

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110976799A (zh) * 2019-11-15 2020-04-10 芜湖新兴铸管有限责任公司 冷却段密封板装置及降低滴落水量对冷却段影响的方法

Also Published As

Publication number Publication date
HU215428B (hu) 1998-12-28
NO933514D0 (no) 1993-10-01
IS1718B (is) 1999-05-07
NO933514L (no) 1994-04-07
EP0592360B1 (fr) 1998-08-12
ZA937029B (en) 1994-05-05
ES2119880T3 (es) 1998-10-16
ATE169532T1 (de) 1998-08-15
HU9302811D0 (en) 1994-01-28
RU2113931C1 (ru) 1998-06-27
CH688129A5 (de) 1997-05-30
DE59308858D1 (de) 1998-09-17
JPH06210405A (ja) 1994-08-02
HUT66151A (en) 1994-09-28
US5390725A (en) 1995-02-21
AU662244B2 (en) 1995-08-24
CA2107187A1 (fr) 1994-04-07
NO302220B1 (no) 1998-02-09
IS4070A (is) 1994-04-07
AU4741393A (en) 1994-04-21
CZ207193A3 (en) 1994-06-15

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