EP1441870A1 - Verfahren und vorrichtung zum rühren und behandlen bei strangguss und halbkontinuierlichem giessen von metall - Google Patents
Verfahren und vorrichtung zum rühren und behandlen bei strangguss und halbkontinuierlichem giessen von metallInfo
- Publication number
- EP1441870A1 EP1441870A1 EP02760539A EP02760539A EP1441870A1 EP 1441870 A1 EP1441870 A1 EP 1441870A1 EP 02760539 A EP02760539 A EP 02760539A EP 02760539 A EP02760539 A EP 02760539A EP 1441870 A1 EP1441870 A1 EP 1441870A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- continuous
- casting
- electrode
- arc
- semi
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
- B22D27/06—Heating the top discard of ingots
-
- 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
Definitions
- the present invention relates to metal continuous and semi continuous castings. More particularly, the invention provides an improved method and apparatus for stirring and treating continuous and semi-continuous casting to produce a high-quality cast of any desired length and cross section composed of a ferrous or of a non-ferrous metal.
- Continuous and Semi-continuous casting are the most commonly used methods for casting and producing semi-finished products such as plats, tubs, shits, etc. While continuous casting is the main method for casting ferrous alloys i.e. low carbon steel, stainless steel, etc., semi-continuous casting is the preferred method for casting non-ferros alloys such as aluminium and copper alloys. Both methods based on continuously pouring metal from a reservoir mostly known as the tundish or the distributor, to a cooled open mold. The mold is open both for metal entrance (usually from the top) and for metal exit (usually from the bottom). Unlike other casting methods the metal does not solidifies completely in the mold, but rather receives an initial solidifying shell and continues to cools outside the mold most commonly by water jets.
- the cast produced by continuous or semi- continuous casting such as billet, bloom, bar, slab etc, hereandafter defined as "rod” is advanced by means of rollers, gravitation, piston etc. the rod undergo further plastic deformation for producing the semi-finished products, mentioned above.
- the main difference between continuous and semi-continuous casting regards the length been cast. In continuous casting the total length can be hundreds of meters in a continuous process. At the end of the casting the rods, are cut from the casting. While in semi-continuous casting the length is constant in the size of several meters, and each billet is cast in a single process. A further mentions of continuous casting will refer to continuous as well as semi continuous casting.
- a further effect in metal alloy casting is the appearance of dendrites during cooling, these being formed during solidification as various points in the mass take up a lattice tree like structure.
- alloying elements such as C, Cr or Ni are pushed outwardly to form a crystal grain boundary, these form later a site for the initiation of cracks in a finished component.
- a concentration of these alloying elements is referred to as segregation, which can to some extent be combated by lower pouring temperatures.
- Impurities from the ladle or the casting powder can form inclusions and further reduce the mechanical properties of the products. Gases, from the atmosphere or other sources are also present in the liquid metal, these being the main cause of casting porosity.
- PCT/IL97/00023 describes an electric arc which could be used in the present apparatusus.
- the present invention achieves the above objects by providing a stirring and treating continuous casting apparatus for the production of improved-quality rods from molten metal, including rod cross-sections having a aspect ratio exceeding 1.8, the apparatus comprising: a) a stand for suspending at least one electric arc electrodeover the upper surface of a metallic casting after or during pouring; b) at least one electrode for forming a moving electric arc over the upper surface of said metallic casting being cast:
- a second electrode being the liquid metal, for completion of an electric circuit including said electric arc and the liquid metal
- control(s) mean(s) connected between said apparatus and a power supply and arranged to supply power to the plasma arc electrode(s) for monitoring the parameters of the electric arc.
- the invention also provides a method for improving quality, such as: reducing voids, inclusions, porosity, dendrite and grain size in metallic continuous rod casting and for improving homogeneity therein, the method comprising step a) continuously pouring the liquid metal into a mold for casting rods. step b) providing at least one first electric arc electrode and positioning same slightly above the upper surface of the molten metal; step c) providing a second electrode in electrical contact with a section of the mold being electrically conductive, and applying an electric current to said electrodes to form an arc between said first electrode and said upper surface; and step d) continuously moving said electric arc(s) over said upper surface.
- the novel device of the present invention improves rod quality by stirring the liquid metal in the mold.
- the electric power required for this purpose is moderate.
- aspect ratio 2 made of copper nickel alloy
- FIG. 1 is a partially section of a preferred embodiment of the apparatus according to the invention.
- FIG. 2 is a detail sectionof the first electrode suspended over the rod
- FIG. 3 is a partially sectional view of an embodiment of the apparatus wherein a second electric circuit is provided to create a magnetic field urging said plasma arc towards the center of the upper surface.
- FIG. 4 is a detail sectional view of an embodiment with a refractory guard ring arranged to prevent solid impurities such as casting powder from reaching the upper surface under the plasma arc;
- FIG. 5 is a detail sectional view of an embodiment arranged to provide a stream of inert gas for preventing oxidation of the molten metal
- FIG. 6 is a photographic view of a section of a slab cast by conventional methods
- FIG 7. a and b are photographic views of a section of a slab cast from the same material using the method and the apparatus of the present invention.
- FIGS. 1 and 2 There is seen in FIGS. 1 and 2 a continuous casting apparatus 10 for the production of improved-quality rods 12 from molten metal 14.
- a water-cooled mold 16 has a cavity open at its upper end 20 to receive molten metal 14 and open at its lower end 22 to release the partially solidified rod 12 being formed.
- the mold 16 is electrically conductive, and functions as one of the components of a electric circuit.
- a first plasma arc electrode 24 is positioned so that its lower face 26 thereof is disposed in proximity to the upper surface 28 of the molten metal 14 having been poured into the mold 16.
- a stand 30 is provided for supporting the first plasma arc electrode 24 above the upper surface 28, leaving a gap of between 2 - 20 mm between the first electrode 24 and the upper surface 28 of the molten metal 14.
- a second plasma arc electrode 32 is attached to the electrically conducting mold 16 or to the metal 12 or 14.
- Control means 34 are connected between the apparatus 10 and power supply source 36. The control means 34 controls the electric circuit parameters, thus enabling an operator to increase or decrease power in accordance with the needs of the process.
- the plasma arc 38 is formed between the upper surface 28 of the molten metal 14 and the lower face 26 of the first electrode 24. The plasma arc 38 completes an electric circuit, and causes stirring of the molten metal 14 in the mold 16.
- the rod 12 continuous to grow in length as long as required and as long as further molten metal 14 is available from the tundish 46 through the nozzle 48.
- FIG. 3 there is seen a continuous casting apparatus further provided with a second electric circuit 68, requiring less power than the first electric circuit, is provided to create a magnetic field urging the plasma arc 38 (see FIG. 2) towards the center of the upper surface 28 (see FIG. 2) of the molten metal 14.
- the second electric circuit 68 passes through the molten metal held in the tundish 46 and through the nozzle 48 and reaches the molten metal 14 in the mold 16.
- FIG. 4 shows a detail of a continuous casting apparatus 10, further provided with a refractory guard ring 54 arranged to prevent solid impurities such as casting powder 56 from the upper surface 28 under the plasma arc 38;
- the refractory guard ring 54 submerged to a level below the upper surface 28 of the molten metal 14 contained in the mold 16.
- FIG.5 shows a detail of a continuous casting apparatus 10, further provided with a stream of inert gas 76 device for preventing oxidation of the molten metal 14;
- the first electrode 24 is hollow and a jet tube 78 is provided for directing a stream of an inert gas 76,
- the gas jet 78 impacts the upper surface 28 of the molten metal 14 of the rod 12 in the mold 16.
- the inert gas prevents oxidation of the molten metal forming the upper surface 28, and removes therefrom any solid impurities, particularly any casting powder if present.
- FIG. 6 is a photograph 90 of a copper-nickel slab section of 400 * 200 mm cast by conventional semi- continuous casting.
- FIGS. 7 a and b are photographs of the same alloy been treated by the method and apparatus of the present invention.
- the improved macrostructure is evident.
- the scope of the described invention is intended to include all embodiments coming within the meaning of the following claims.
- the foregoing examples illustrate useful forms of the invention, but are not to be considered as limiting its scope, as those skilled in the art will readily be aware that additional variants and modifications of the invention can be formulated without departing from the meaning of the following claims.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IL14509901A IL145099A0 (en) | 2001-08-23 | 2001-08-23 | Method and apparatus for stirring and treating continuous and semi continuous metal casting |
IL14509901 | 2001-08-23 | ||
PCT/IL2002/000686 WO2003018231A1 (en) | 2001-08-23 | 2002-08-20 | Method and apparatus for stirring and treating continuous and semi continuous metal casting |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1441870A1 true EP1441870A1 (de) | 2004-08-04 |
EP1441870A4 EP1441870A4 (de) | 2005-12-21 |
Family
ID=11075732
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02760539A Withdrawn EP1441870A4 (de) | 2001-08-23 | 2002-08-20 | Verfahren und vorrichtung zum rühren und behandlen bei strangguss und halbkontinuierlichem giessen von metall |
Country Status (4)
Country | Link |
---|---|
US (1) | US20050034840A1 (de) |
EP (1) | EP1441870A4 (de) |
IL (1) | IL145099A0 (de) |
WO (1) | WO2003018231A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007087378A2 (en) | 2006-01-25 | 2007-08-02 | Energetics Technologies, L.L.C. | Method of continuous casting in which axial porosity is eliminated and the crystalline structure is refined |
JP5774419B2 (ja) * | 2011-09-02 | 2015-09-09 | 株式会社神戸製鋼所 | チタンまたはチタン合金からなるスラブの連続鋳造装置 |
CN112974738A (zh) * | 2021-04-23 | 2021-06-18 | 北京科技大学 | 连铸微合金化生产方法 |
Family Cites Families (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3152372A (en) * | 1959-12-10 | 1964-10-13 | Firth Sterling Inc | Method and apparatus for producing improved alloy metal |
US3377294A (en) * | 1965-01-22 | 1968-04-09 | Monsanto Co | Method for detecting moisture |
US3546348A (en) * | 1968-04-01 | 1970-12-08 | Westinghouse Electric Corp | Non-consumable electrode vacuum arc furnaces for steel,zirconium,titanium and other metals and processes for working said metals |
US3586749A (en) * | 1969-06-20 | 1971-06-22 | Sergei Apollonovich Iodkovsky | Method for the electroslag welding and building up of metals and alloys |
US3617596A (en) * | 1969-08-27 | 1971-11-02 | Westinghouse Electric Corp | Nonconsumable electrode vacuum arc furnace for steel, zirconium, titanium and other metals |
US3680163A (en) * | 1969-08-27 | 1972-08-01 | Westinghouse Electric Corp | Non-consumable electrode vacuum arc furnaces for steel, zirconium, titanium and other metals and processes for working said metals |
US3597519A (en) * | 1970-02-05 | 1971-08-03 | Westinghouse Electric Corp | Magnetic-field rotating-electrode electric arc furnace apparatus and methods |
US3696859A (en) * | 1971-05-18 | 1972-10-10 | Heppenstall Co | Production of large steel ingots with consumable vacuum arc hot tops |
US3920063A (en) * | 1973-03-24 | 1975-11-18 | Sumitomo Metal Ind | Top pouring ingot making method using cover flux |
US3947265A (en) * | 1973-10-23 | 1976-03-30 | Swiss Aluminium Limited | Process of adding alloy ingredients to molten metal |
US4042007A (en) * | 1975-04-22 | 1977-08-16 | Republic Steel Corporation | Continuous casting of metal using electromagnetic stirring |
US4132545A (en) * | 1975-12-08 | 1979-01-02 | Rabinovich Volf I | Method of electroslag remelting processes using a preheated electrode shield |
US4017672A (en) * | 1976-03-11 | 1977-04-12 | Paton Boris E | Plasma-arc furnace for remelting metals and alloys |
US4307280A (en) * | 1980-06-06 | 1981-12-22 | Westinghouse Electric Corp. | Method for filling internal casting voids |
US4770724A (en) * | 1980-07-02 | 1988-09-13 | General Electric Company | Continuous metal casting method and apparatus and products |
US4427052A (en) * | 1982-05-07 | 1984-01-24 | Marvin Garfinkle | Method of rotary refining and casting |
SE447846B (sv) * | 1982-09-09 | 1986-12-15 | Asea Ab | Skenkugn med likstromsvermning |
IT1178173B (it) * | 1984-10-25 | 1987-09-09 | Centro Speriment Metallurg | Procedimento per la regolazione delle condizioni di colata continua |
LU85846A1 (fr) * | 1985-04-10 | 1986-11-05 | Metz Paul | Dispositif de brassage de metal en fusion dans une installation de coulee continue |
IT1183045B (it) * | 1985-12-06 | 1987-10-05 | Centro Speriment Metallurg | Proccedimento perfezionato per la regolazione delle condizzioni di colata continua |
US4970435A (en) * | 1987-12-09 | 1990-11-13 | Tel Sagami Limited | Plasma processing apparatus |
FR2671677A1 (fr) * | 1991-01-11 | 1992-07-17 | Rotelec Sa | Procede de realisation d'un inducteur electromagnetique. |
USH1179H (en) * | 1991-03-18 | 1993-05-04 | The United States Of America As Represented By The Secretary Of The Army | Vader plasma arc casting |
US5273101A (en) * | 1991-06-05 | 1993-12-28 | General Electric Company | Method and apparatus for casting an arc melted metallic material in ingot form |
IL116939A0 (en) * | 1996-01-29 | 1996-05-14 | Netanya Plasmatek Ltd | Plasma torch apparatus |
FR2767081B1 (fr) * | 1997-08-11 | 1999-09-17 | Lorraine Laminage | Procede de rechauffage d'un metal liquide dans un repartiteur de coulee continue au moyen d'une torche a plasma, et repartiteur pour sa mise en oeuvre |
-
2001
- 2001-08-23 IL IL14509901A patent/IL145099A0/xx unknown
-
2002
- 2002-08-20 EP EP02760539A patent/EP1441870A4/de not_active Withdrawn
- 2002-08-20 US US10/487,447 patent/US20050034840A1/en not_active Abandoned
- 2002-08-20 WO PCT/IL2002/000686 patent/WO2003018231A1/en not_active Application Discontinuation
Non-Patent Citations (10)
Also Published As
Publication number | Publication date |
---|---|
IL145099A0 (en) | 2002-06-30 |
US20050034840A1 (en) | 2005-02-17 |
EP1441870A4 (de) | 2005-12-21 |
WO2003018231A1 (en) | 2003-03-06 |
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Legal Events
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A4 | Supplementary search report drawn up and despatched |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20091229 |