EP0462478A1 - Vorrichtung zum Giessen von flüssigem Metall - Google Patents

Vorrichtung zum Giessen von flüssigem Metall Download PDF

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Publication number
EP0462478A1
EP0462478A1 EP91109425A EP91109425A EP0462478A1 EP 0462478 A1 EP0462478 A1 EP 0462478A1 EP 91109425 A EP91109425 A EP 91109425A EP 91109425 A EP91109425 A EP 91109425A EP 0462478 A1 EP0462478 A1 EP 0462478A1
Authority
EP
European Patent Office
Prior art keywords
section
flow
profile
cross
branches
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Withdrawn
Application number
EP91109425A
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English (en)
French (fr)
Inventor
Ferdinand Paul Joseph Blum
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.)
Arcelor Luxembourg SA
Original Assignee
Arbed SA
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 Arbed SA filed Critical Arbed SA
Publication of EP0462478A1 publication Critical patent/EP0462478A1/de
Withdrawn legal-status Critical Current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
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles

Definitions

  • the present invention relates to an improvement made to the devices used for flowing liquid metal from any container, either into another treatment or transport container, or into an enclosure used for solidifying the metal.
  • the containers thus targeted can be, inter alia, converters and electric furnaces for processing or processing, transfer or nuance bags, tundish distributors.
  • the devices used for flowing liquid metal can be conventional shutters with cattails, but they are more and more nozzles with sliding or rotary drawers in the forms and in the most varied executions, these devices being designated below sometimes , regardless of type, simply by the name of the shutters.
  • a turbulent jet causes considerable amounts of air.
  • the metal, in this case steel therefore undergoes oxidation on the surface, which leads to an increase in inclusions on the finished product which negatively affects the degree of internal cleanliness, that is to say on the properties of the product obtained and on its processability.
  • a turbulent jet causes in addition inside the mold a foaming and splashes which solidify prematurely against the wall of the mold and lead to a quality of surface of the bars which is insufficient and which will be responsible for the surface defects during rolling.
  • Canadian patent No. 1,200,384 describes a sliding assembly for closing the orifice of a steelworks pocket.
  • This set is distinguished by the fact that the fixed upper part is provided with a round section orifice and the movable lower part with a section orifice in the shape of an equilateral triangle.
  • the base of the triangle is narrow and has approximately the same dimension as the diameter of the round upper orifice and the bisector of the triangle covers itself with the opening and closing path.
  • For closing the movement of the movable lower nozzle part is done in the direction of the angle of the apex of the equilateral triangle, i.e.
  • both the final jet in the process of throttling and the initial jet in the process of formation will be significant, given that halfway through the stroke of the movable part in front of the orifice of the fixed upper part is half of the total flow section which is exposed.
  • the declining or nascent jets are oriented in the gutter formed by the angle of the top of the section and flow therefrom, not without forming vortices and without projecting fairly large splashes.
  • the aim of the present invention is to provide the nozzles with the improvements necessary so that they give laminar flow jets under all operating conditions, discontinuous or continuous, and that they therefore make it possible to reduce the frequency and the importance of internal and surface defects of the product obtained by casting.
  • a device serving to make flow of metal which is characterized in that the effective section of the device, constituted by the surface of the conduit available for the flow of metal during the progressive opening of the passage, is first kept small and in that at least over part of its height the flow conduit has a profiled active passage section, the profile extending to the last end of the conduit and having a shape comparable to that of a star with three to four branches, the bottoms of the branches of the profile extending axially in the direction of flow and serving to guide the metal during the flow of the latter.
  • the bottoms of the branches of the star profile that is to say the radial ends of the rays of the star, extend in a way like grooves axially along of the metal flow duct.
  • the profile covers a very significant part of the length of the duct and in any case it extends to its lower end.
  • the above-mentioned spokes of the star profile form an acute angle between them for the three-branched form and a right angle (or with arms with square bases or rectangular bases resp.)
  • the four-branched form that is to say say that the sections are actually substantially triangular and cross-shaped.
  • the cross-section of the flow duct arranged in the lower plate of the obturator -or integral with the latter-, is oriented in such a way in or vis-à-vis the movable, sliding or rotary shutter, that a pointed part of the section is open in the first place during the relative movement of the respective parts of the drawer during the opening thereof.
  • This tip is therefore oriented substantially in the direction of movement if the lower plate, carrying the nozzle portion with profiled conduit, is mobile, while it is in the opposite direction to the movement if an upper mobile plate is used for the shutter.
  • the axis of the latter can be rotated by a given angle relative to the direction of opening - closing.
  • the section at the inlet of the flow conduit is at least equal, if not preferably 10% to 15% greater than the section at the level where the jet leaves the conduit.
  • the flare, apart from a possible enlarged and rounded seat, intended to receive the head of a stopper device, will preferably be located in the upper part of the duct, the lower part thereof being of diameter constant.
  • the ratio between the section at the outlet of the upper part and the middle section of the lower part will be roughly similar to what has been said about the upper and lower sections of the profiled duct itself. even, that is to say that if the sections do not remain substantially constant, they decrease from top to bottom.
  • a nozzle need not necessarily have the particular geometry of its section over the entire length of the flow channel. It is however essential that the end part of the flow channel of the body of a nozzle or of the lower part of a shutter has the particular geometry.
  • the profile covers an extent greater than at least 50%, preferably greater than 75% of the total length of the channel. It is also important that the shape stability of the nozzle is good and changes little by erosion, so that even at the end of casting the profile remains sufficiently pronounced to prevent the jet from starting to turn and leading to the formation of an umbrella jet.
  • this section should not be less than about 40% of the standard section of a circular section nozzle and not more than about 120% of this reference section.
  • the star section presents preferably the ends of branches 21, that is to say the tips of the spokes, rounded. These spokes are moreover also easier and more economical to produce by refractorists than the sharp points 11 of the strictly triangular section, represented by the thinnest line 1.
  • the three lateral sides of the section represented by the thicker line 2 are re-entrant.
  • the lateral necking 23, as shown, is for example between 3 and 4 mm relative to the corresponding side wall of the equivalent triangular section 1.
  • the radius of a branch of the profile is covered with the axis relative displacement between the parts of a sliding shutter with at least one movable part and it points in the direction of movement of the movable lower part 3 which, in view of the opening of the casting passage, meets the orifice of round section in the upper plate.
  • the projection of the lower plate 3 to the left of the figure shows that over at least a few millimeters the section of the flow duct is circular 5, but that the underlying part has the star section 2 which extends To the bottom.
  • the guidance of the jet therefore does not start directly under the opening plate but slightly lower and it continues in the profiled end part of the nozzle.
  • Figure 3 shows a view similar to that of Figure 2, except that the profiled section 6 of the flow channel is cruciform. As illustrated, the ends of the arms of the cross can be rounded instead of being at right angles. The completely upstream part of the channel is also of round section 5, while further down the section has the profile 6. The radius of the profile illustrated remains constant from top to bottom, but the surface of the section at the entrance is slightly larger than on exit.
  • This new design according to the invention also has an additional advantage which plays especially during the rapid emptying of metallurgical vessels containing metal and slag, as is the case for steel plant converters, or when the level is left in a large surface container, such as tundish, lower very low. Indeed the anti-rotation action of the profile according to the invention is opposed to the formation of a too large flow vortex. Thus, as the vortex cannot really develop, there is no slag cone and / or air which is entrained by the center of the vortex and which generally requires a premature stop of the emptying with a loss material and productivity.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Continuous Casting (AREA)
EP91109425A 1990-06-20 1991-06-08 Vorrichtung zum Giessen von flüssigem Metall Withdrawn EP0462478A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU87752 1990-06-20
LU87752A LU87752A1 (fr) 1990-06-20 1990-06-20 Amelioration aux dispositifs servant a faire ecouler du metal en fusion

Publications (1)

Publication Number Publication Date
EP0462478A1 true EP0462478A1 (de) 1991-12-27

Family

ID=19731240

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91109425A Withdrawn EP0462478A1 (de) 1990-06-20 1991-06-08 Vorrichtung zum Giessen von flüssigem Metall

Country Status (5)

Country Link
US (1) US5173198A (de)
EP (1) EP0462478A1 (de)
JP (1) JPH04231171A (de)
CA (1) CA2043758A1 (de)
LU (1) LU87752A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2543455A1 (de) * 2011-07-08 2013-01-09 Refractory Intellectual Property GmbH & Co. KG Feuerfeste keramische Schieberplatte und zugehöriges Schieberplattenset

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103796774B (zh) * 2011-09-22 2016-09-14 维苏威坩埚公司 双入口通道钢包底部
AU2017308852A1 (en) * 2016-08-09 2019-02-07 Ak Steel Properties, Inc. Tundish funnel

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1201013B (de) * 1961-03-18 1965-09-16 Stoecker & Kunz Ges Mit Beschr Ausguss am Boden einer Giesspfanne fuer fluessige Metalle
FR1514434A (fr) * 1967-02-07 1968-02-23 Stoecker & Kunz G M B H Busette de poche de coulée ou d'un autre récipient de distribution de métaux en fusion, présentant de préférence une section d'entrée ronde
GB1159118A (en) * 1965-08-04 1969-07-23 Stoecker & Kunz Gmbh Pouring Spout for Molten Metals
CA1200384A (en) * 1982-04-22 1986-02-11 Francis L. Kemeny, Jr. Ladle slide gate collector nozzle

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH663365A5 (de) * 1984-05-11 1987-12-15 Stopinc Ag Verschlussplattenpaar fuer einen schiebeverschluss am ausguss von schmelze, insbesondere metallische schmelze, enthaltenden behaeltern.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1201013B (de) * 1961-03-18 1965-09-16 Stoecker & Kunz Ges Mit Beschr Ausguss am Boden einer Giesspfanne fuer fluessige Metalle
GB1159118A (en) * 1965-08-04 1969-07-23 Stoecker & Kunz Gmbh Pouring Spout for Molten Metals
FR1514434A (fr) * 1967-02-07 1968-02-23 Stoecker & Kunz G M B H Busette de poche de coulée ou d'un autre récipient de distribution de métaux en fusion, présentant de préférence une section d'entrée ronde
CA1200384A (en) * 1982-04-22 1986-02-11 Francis L. Kemeny, Jr. Ladle slide gate collector nozzle

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2543455A1 (de) * 2011-07-08 2013-01-09 Refractory Intellectual Property GmbH & Co. KG Feuerfeste keramische Schieberplatte und zugehöriges Schieberplattenset
WO2013007526A3 (de) * 2011-07-08 2013-06-13 Refractory Intellectual Property Gmbh & Co. Kg Feuerfeste keramische schieberplatte und zugehöriges schieberplattenset
US9375786B2 (en) 2011-07-08 2016-06-28 Refractory Intellectual Property Gmbh & Co. Kg Refractory ceramic slide plate and associated slide plate set
EA025092B1 (ru) * 2011-07-08 2016-11-30 Рифрэктори Интеллектчуал Проперти Гмбх Унд Ко. Кг Огнеупорная керамическая шиберная плита и соответствующий комплект плит для шиберного затвора

Also Published As

Publication number Publication date
JPH04231171A (ja) 1992-08-20
US5173198A (en) 1992-12-22
LU87752A1 (fr) 1992-01-15
CA2043758A1 (en) 1991-12-21

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