EP0749790B2 - Vorrichtung zur Herstellung eines gerichtet erstarrten Giesskörpers - Google Patents

Vorrichtung zur Herstellung eines gerichtet erstarrten Giesskörpers Download PDF

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Publication number
EP0749790B2
EP0749790B2 EP96810192A EP96810192A EP0749790B2 EP 0749790 B2 EP0749790 B2 EP 0749790B2 EP 96810192 A EP96810192 A EP 96810192A EP 96810192 A EP96810192 A EP 96810192A EP 0749790 B2 EP0749790 B2 EP 0749790B2
Authority
EP
European Patent Office
Prior art keywords
baffle
gas
chamber
mold
casting
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
EP96810192A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0749790A1 (de
EP0749790B1 (de
Inventor
Edvard L. Prof. Dr. Kats
Maxim Dr. Konter
Joachim Dr. Rösler
Vladimir P. Dr. Lubenets
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.)
General Electric Technology GmbH
Original Assignee
Alstom Technology 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
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Application filed by Alstom Technology AG filed Critical Alstom Technology AG
Publication of EP0749790A1 publication Critical patent/EP0749790A1/de
Application granted granted Critical
Publication of EP0749790B1 publication Critical patent/EP0749790B1/de
Publication of EP0749790B2 publication Critical patent/EP0749790B2/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
    • 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
    • B22D27/045—Directionally solidified castings

Definitions

  • the directionally solidified casting body can be used as Single crystal or be formed by stem crystals aligned in a preferred direction.
  • the directional solidification takes place under conditions in which between a cooled Part of a molten starting material receiving mold and the still molten starting material a strong heat exchange takes place. It can then form a solidified material with a direction Form solidification front, which with continuous removal of heat with formation of the directly solidified casting body wanders through the mold.
  • the production of a flawless casting body essentially depends on the size of the temperature gradient on the solidification front and the rate of solidification. With a low temperature gradient and high hardening speed no directionally solidified casting can be produced. However, with one large temperature gradients and with a slow solidification rate a directionally solidified casting are produced, however, such a casting has undesirable defects, such as in particular in chains arranged and coaxially aligned grains (freckles).
  • the invention is based on a method for producing a directionally solidified casting body and from an apparatus for performing the method as described, for example, in US-A-3,532,155 is.
  • the method described is used to manufacture the rotor blades and guide vanes of gas turbines and uses an evacuable oven.
  • This oven has two separated by a water-cooled wall and superimposed chambers, of which the upper chamber is heatable and one swiveling crucible for holding material to be cast, for example a nickel-based alloy, having.
  • the lower chamber connected to this heating chamber through an opening in the water-cooled wall is designed to be coolable and has walls through which water flows.
  • One through the bottom of this cooling chamber and The opening in the water-cooled wall of the drive rod carries a cooling plate through which water flows forms the bottom of a mold located in the heating chamber.
  • the alloy liquefied in the crucible is first of all converted into the Pouring mold located in the heating chamber. This forms above the cooling plate forming the mold base a narrow zone made of directionally solidified alloy. With a downward movement of the This mold is passed through the opening provided in the water-cooled wall. One off the zone solidification front which limits the directionally solidified alloy migrates to form a directionally solidified casting body from bottom to top through the entire mold.
  • lambda m or lambda md the specific thermal conductivity of the alloy or ceramic casting mold
  • ⁇ m or ⁇ md the thickness of the already solidified metal layer (assumed as 30 mm) between the part of the mold wall located under the water - cooled wall and the solidification front or mean the thickness of the mold wall (assumed as 10 mm)
  • the invention as specified in claim 1, is based on the object of a device Specify the type mentioned, with the easily solidified directional casting body with a small Number of defects can be produced. This object is achieved by the features listed in claim 1.
  • the single figure shows a preferred embodiment of a device in a schematic representation for the production of a directionally solidified casting body.
  • the device shown in the single figure has a vacuum chamber which can be evacuated via a vacuum system 1 2 on.
  • the vacuum chamber 2 takes two separated by a baffle (radiation shield) 3, chambers 4, 5 arranged one above the other and a pivotable crucible 6 for holding an alloy, for example, a nickel base super alloy.
  • the upper 4 of the two chambers is heatable.
  • the with the heating chamber 4 through an opening 7 in the baffle 3 connected lower chamber 5 contains a device for Generating and guiding a gas flow.
  • This device contains a cavity with openings or nozzles 8, which point towards the inside of a casting mold 12 and a system for generating gas streams 9 Openings or nozzles 8 emerging gas streams are mainly centripetal.
  • the Drive rod 10 guided at the bottom of cooling chamber 5 carries a cooling plate 11, which may have water flowing through it, which forms the bottom of a mold 12.
  • This casting mold can be driven by the heating chamber 4 through a drive acting on the drive rod 10 the opening 7 are guided into the cooling chamber 5.
  • the casting mold 12 has a thin-walled, for example 10 mm thick, part 13 above the cooling plate 11 made of ceramic, which can accommodate the formation of crystals and / or a helix starter. By lifting off the cooling plate 11 or by placing it on the cooling plate 11, the casting mold 12 can be opened or getting closed. At its upper end, the mold 12 is open and can be inserted into the heating chamber 4 guided filling device 14 are filled with molten alloy 15 from the crucible 6. The mold 12 in the heating chamber 4 surrounding electrical heating elements 16 hold the part of the casting mold on the heating chamber side 12 alloy part located above their liquidus temperature.
  • the cooling chamber is with the entrance of a vacuum system 17 for removing the inflowing gas connected from the vacuum chamber 2 and for cooling and cleaning the removed gas.
  • the casting mold 12 is first made by an upward movement the drive rod 10 brought into the heating chamber 4 (indicated by dashed lines in the figure).
  • the melting pot 6 liquefied alloy is then poured into the mold 12 via the filling device 14. This forms Above the cooling plate 11 forming the mold base, a narrow zone made of directionally solidified alloy (in the Figure not shown).
  • the ceramic part 13 With a downward movement of the casting mold 12 directed into the cooling chamber 5, the ceramic part 13 becomes the Casting mold 12 successively guided through the opening 7 provided in the baffle 3. A more solidified the zone Alloy-bounding solidification front 19 migrates from to form a directionally solidified casting body 20 bottom up through the entire mold (figure).
  • the inert gas flows emerging from the openings or nozzles 8 impinge on the surface of the ceramic part 13 and are conducted downwards along the surface. Here they withdraw heat q from the mold 12 and thus also from the already solidified part of the mold content q.
  • a particularly high level of heat extraction even with a complex mold is achieved if that Baffle 3 is cooled and / or if its opening 7 is delimited by flexible fingers 21 resting on the casting mold 12 is.
  • the inert gas blown into the cooling chamber 5 can be removed from the vacuum chamber by the vacuum system 17 2 removed, cooled filtered and - compressed to a few bar - pipelines 18 supplied with the openings or nozzles 8 are operatively connected.
  • the next casting mold can be filled with molten metal after removal of the casting mold 12 and evacuating the vacuum chamber 2.
  • the solidification front typically has a concave shape.
  • the solidification front flat or even convex.
  • a single-crystal solidification of a turbine blade can thus be achieved with the invention be better adjusted in the area of its inside and outside end.
EP96810192A 1995-06-20 1996-03-26 Vorrichtung zur Herstellung eines gerichtet erstarrten Giesskörpers Expired - Lifetime EP0749790B2 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19522266 1995-06-20
DE19522266 1995-06-20
DE19539770 1995-10-26
DE19539770A DE19539770A1 (de) 1995-06-20 1995-10-26 Verfahren zur Herstellung eines gerichtet erstarrten Gießkörpers und Vorrichtung zur Durchführung dieses Verfahrens

Publications (3)

Publication Number Publication Date
EP0749790A1 EP0749790A1 (de) 1996-12-27
EP0749790B1 EP0749790B1 (de) 2000-08-23
EP0749790B2 true EP0749790B2 (de) 2004-11-03

Family

ID=26016101

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96810192A Expired - Lifetime EP0749790B2 (de) 1995-06-20 1996-03-26 Vorrichtung zur Herstellung eines gerichtet erstarrten Giesskörpers

Country Status (5)

Country Link
US (1) US5921310A (ru)
EP (1) EP0749790B2 (ru)
JP (1) JP3919256B2 (ru)
DE (2) DE19539770A1 (ru)
EA (1) EA000040B1 (ru)

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RU2117550C1 (ru) * 1997-09-12 1998-08-20 Всероссийский научно-исследовательский институт авиационных материалов Устройство для получения отливок с направленной и монокристаллической структурой
US6715534B1 (en) * 1997-09-12 2004-04-06 All-Russian Scientific Research Institute Of Aviation Materials Method and apparatus for producing directionally solidified castings
DE19845805C1 (de) * 1998-09-30 2000-04-27 Tacr Turbine Airfoil Coating A Verfahren und Behandlungseinrichtung zum Abkühlen von hocherwärmten Metallbauteilen
US6192969B1 (en) * 1999-03-22 2001-02-27 Asarco Incorporated Casting of high purity oxygen free copper
EP1065026B1 (de) * 1999-06-03 2004-04-28 ALSTOM Technology Ltd Verfahren zur Herstellung oder zur Reparatur von Kühlkanälen in einstristallinen Komponenten von Gasturbinen
RU2146185C1 (ru) * 1999-07-27 2000-03-10 Спиридонов Евгений Васильевич Способ изготовления направленной кристаллизацией детали с монокристаллической структурой и устройство для его осуществления
EP1076119A1 (en) 1999-08-11 2001-02-14 ABB Alstom Power (Schweiz) AG Apparatus and method for manufacture a directionally solidified columnar grained article
US6311760B1 (en) 1999-08-13 2001-11-06 Asea Brown Boveri Ag Method and apparatus for casting directionally solidified article
RU2157296C1 (ru) * 1999-10-12 2000-10-10 Спиридонов Евгений Васильевич Способ изготовления направленной кристаллизацией детали с монокристаллической структурой и устройство для его осуществления
EP1162016B1 (en) * 2000-05-13 2004-07-21 ALSTOM Technology Ltd Apparatus for casting a directionally solidified article
DE10024302A1 (de) * 2000-05-17 2001-11-22 Alstom Power Nv Verfahren zur Herstellung eines thermisch belasteten Gussteils
DE10038453A1 (de) * 2000-08-07 2002-02-21 Alstom Power Nv Verfahren zur Herstellung eines gekühlten Feingussteils
RU2167739C1 (ru) * 2000-10-09 2001-05-27 Цацулина Ирина Евгеньевна Способ изготовления направленной кристаллизацией детали с монокристаллической структурой и устройство для его осуществления
DE10060141A1 (de) 2000-12-04 2002-06-06 Alstom Switzerland Ltd Verfahren zur Herstellung eines Gussteils, Modellform und keramischer Einsatz zum Gebrauch in diesem Verfahren
JP2003191067A (ja) 2001-12-21 2003-07-08 Mitsubishi Heavy Ind Ltd 方向性凝固鋳造装置、方向性凝固鋳造方法
EP1340583A1 (en) 2002-02-20 2003-09-03 ALSTOM (Switzerland) Ltd Method of controlled remelting of or laser metal forming on the surface of an article
EP1340567A1 (en) 2002-02-27 2003-09-03 ALSTOM (Switzerland) Ltd Method of removing casting defects
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DE60220930T2 (de) 2002-11-29 2008-03-13 Alstom Technology Ltd. Verfahren zur Herstellung, Modifizierung oder Reparatur von einkristallinen oder gerichtet erstarrten Körpern
US6896030B2 (en) * 2003-07-30 2005-05-24 Howmet Corporation Directional solidification method and apparatus
DE60311658T2 (de) 2003-11-06 2007-11-22 Alstom Technology Ltd. Verfahren zum Giessen eines gerichtet erstarrten Giesskörpers
AT503391B1 (de) * 2006-04-04 2008-10-15 O St Feingussgesellschaft M B Verfahren zum feingiessen von metallischen formteilen und vorrichtung hierfür
DE102007014744A1 (de) * 2007-03-28 2008-10-02 Rwth Aachen Form und Verfahren zur gießtechnischen Herstellung eines Gusstücks
US20100071812A1 (en) * 2008-09-25 2010-03-25 General Electric Company Unidirectionally-solidification process and castings formed thereby
RU2444415C1 (ru) * 2010-07-27 2012-03-10 Государственное Образовательное Учреждение Высшего Профессионального Образования "Московский Государственный Технический Университет Имени Н.Э. Баумана" Способ гравитационного литья фасонных отливок
US8186418B2 (en) * 2010-09-30 2012-05-29 General Electric Company Unidirectional solidification process and apparatus therefor
EP2460606A1 (de) * 2010-12-01 2012-06-06 Siemens Aktiengesellschaft Verfahren zur Verminderung von Porositäten beim Gießen von Gussbauteilen mit globularen Körnern und Vorrichtung
US10082032B2 (en) 2012-11-06 2018-09-25 Howmet Corporation Casting method, apparatus, and product
US20160325351A1 (en) * 2013-12-30 2016-11-10 United Technologies Corporation Directional solidification apparatus and related methods
PL222793B1 (pl) * 2014-03-13 2016-09-30 Seco/Warwick Europe Spółka Z Ograniczoną Odpowiedzialnością Sposób ukierunkowanej krystalizacji odlewów łopatek turbin gazowych oraz urządzenie do wytwarzania odlewów łopatek turbiny gazowej o ukierunkowanej i monokrystalicznej strukturze
CN105618689A (zh) * 2016-01-25 2016-06-01 江苏大学 一种利用真空快速熔炼制备涡轮叶片的装置
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Also Published As

Publication number Publication date
JPH0910919A (ja) 1997-01-14
DE59605783D1 (de) 2000-09-28
EA199600020A3 (ru) 1997-03-31
EP0749790A1 (de) 1996-12-27
EP0749790B1 (de) 2000-08-23
EA000040B1 (ru) 1998-02-26
DE19539770A1 (de) 1997-01-02
JP3919256B2 (ja) 2007-05-23
EA199600020A2 (ru) 1996-12-30
US5921310A (en) 1999-07-13

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