EP1211001B1 - Procédé de fabrication d'une pièce moulée, modèle et insert utilisés dans ce procédé - Google Patents

Procédé de fabrication d'une pièce moulée, modèle et insert utilisés dans ce procédé Download PDF

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Publication number
EP1211001B1
EP1211001B1 EP01128084A EP01128084A EP1211001B1 EP 1211001 B1 EP1211001 B1 EP 1211001B1 EP 01128084 A EP01128084 A EP 01128084A EP 01128084 A EP01128084 A EP 01128084A EP 1211001 B1 EP1211001 B1 EP 1211001B1
Authority
EP
European Patent Office
Prior art keywords
casting
projections
ceramic insert
clearances
produced
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
EP01128084A
Other languages
German (de)
English (en)
Other versions
EP1211001A3 (fr
EP1211001A2 (fr
Inventor
Alexander Dr. Beeck
Herbert Brandl
Alexander Hoffs
Roland Mücke
Sergej Riazantsev
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
Application filed by Alstom Technology AG filed Critical Alstom Technology AG
Publication of EP1211001A2 publication Critical patent/EP1211001A2/fr
Publication of EP1211001A3 publication Critical patent/EP1211001A3/fr
Application granted granted Critical
Publication of EP1211001B1 publication Critical patent/EP1211001B1/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
    • B22C—FOUNDRY MOULDING
    • B22C21/00—Flasks; Accessories therefor
    • B22C21/12—Accessories
    • B22C21/14—Accessories for reinforcing or securing moulding materials or cores, e.g. gaggers, chaplets, pins, bars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/02—Lost patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B22C9/04—Use of lost patterns

Definitions

  • the invention relates to a method for producing a casting of a thermal turbomachine according to the preamble of claim 1.
  • Castings of thermal turbomachinery are manufactured by known casting processes. Cast furnaces for such casting methods are for example from the writings EP-A1-749 790 . US 3,763,926 or US 3,690,367 known.
  • a method for producing a complex part of a gas turbine by means of a casting mold is known, for example, from the document US 5,296,308 known.
  • a wax model of the hollow part to be molded is made by a model mold and a ceramic insert. Thereafter, this model mold is removed and molded around the wax model of a ceramic mold by a slurry. After the wax has been burned out, the casting can be made by a casting process as mentioned above.
  • the projections also have little beneficial side effects.
  • recesses In the wall of the casting caused by these projections recesses.
  • the notch factor of these recesses is so far relatively large.
  • the disadvantage is that these recesses can therefore be arranged only in certain areas on the component surface, since the voltages that act on the component during operation, under certain circumstances may be too large, so that there may be cracks in the affected components.
  • the invention is based on the object to provide a method for producing a casting of a thermal turbomachine by means of a known casting process, wherein the casting of the casting is made with a wax model and a ceramic insert, and wherein there are projections on the insert, which Notch factor at the recesses of the casting, which arise through the projections of the insert, reduced.
  • this object is achieved by a method according to the preamble of claim 1, in that the recesses formed on the casting by the projections are ground or eroded partly from the outer side of the casting in a conical or cylindrical shape.
  • a cylindrical, conical or round pin is attached in the recess of the casting. This pin can be soldered, for example or be welded.
  • the closing of the recesses prevents leakage of cooling air.
  • Another advantage of this closure is that local overheating of the edges of the recesses is prevented. This can occur when cleaning coated blades, for example by arc cleaning.
  • the notch factor of the resulting recesses on the casting decreases, provided that the angle between the center line and the outer edge of the projections is less than 15 °.
  • the projections may be arranged at locations of the casting, which were previously not possible due to increased stresses during operation. A higher density of the projections is conceivable. An improved distribution or an increased number of projections improves the fixation of the ceramic insert in the model mold or in the ceramic casting mold during the casting process. According to a further embodiment, it is conceivable that the angles at different sides of the projection are of different sizes, i. have different values.
  • An advantageous embodiment is when the projections protrude into the model shape.
  • a clearer contour of the edges of the recesses is achieved.
  • the movement of the ceramic insert in a direction parallel to the wall of the casting is possible to a certain extent. This may u.U. prevent breakage of the ceramic insert due to thermal stresses acting thereon during the casting process.
  • the invention relates to a method for producing a thermally loaded casting of a thermal turbomachine.
  • This may be, for example, a guide or blade of a gas turbine or a combustion chamber part in detail.
  • castings are manufactured using casting furnaces generally known in the art. Such a casting furnace can be used to produce complex components that can be exposed to high thermal and mechanical stresses. Castings of thermal turbomachinery are typically single crystal (SX) or directionally solidified (DS) components. However, the invention is in no way limited thereto. Rather, it can also extend to undirected solidified components (CC).
  • SX single crystal
  • DS directionally solidified
  • CC undirected solidified components
  • the FIG. 1 shows a wax model 1 of a turbine blade to be cast.
  • This wax model 1 is in a liquid, ceramic material, which Also called slip, immersed.
  • the wax model 1 forms the later ceramic casting of the casting.
  • the ceramic material is dried, so that the mold with which the casting is produced arises.
  • the wax 4 is removed by a suitable heat treatment, ie burned out.
  • the mold is fired, ie it contains in this way their strength.
  • the casting is produced in a manner known per se with the casting mold thus obtained by means of a casting furnace known from the prior art. Later, the ceramic mold is appropriately removed, for example, by using an acid or alkali.
  • the turbine blade which from the wax model 1 of the FIG. 1 is manufactured, has a cavity in which cooling air can be introduced during operation of the turbomachine.
  • a ceramic insert 2 located inside the wax model 1 during the manufacturing process of the mold, which reproduces the geometry of the cavity.
  • This wax model 1 is replaced by another, in the FIG. 1 Model mold 9 not shown, wherein liquid wax 4 is poured between the model mold 9 and the ceramic insert 2 located therein, which then solidifies.
  • FIG. 2 shows a section along the line II - II of FIG. 1 through the wax model 1 and the ceramic insert 2.
  • the ceramic insert 2 is equipped with projections 3 according to the invention. The projections 3 protrude into the wax 4 of the wax model. 1
  • the inventive projections 3 and the recesses 5, which thereby arise on the casting 6, are in the FIGS. 3, 4 and 5 shown in more detail.
  • the projections 3 at an angle ⁇ , ⁇ between a center line 10 of the projections 3 and the outer edge of the projections 3 not to produce over 30 °.
  • the notch factors at the recesses 5, which by the projections 3 on the Casting 6 arise (Fig. 4, 5) are thereby advantageously reduced.
  • the projections 3 may also be arranged at locations of the casting 6, on which it was previously not possible due to increased voltages during operation. Also, a higher density of the projections 3 on the surface is conceivable.
  • the angle ⁇ , ⁇ between the center line and the outer edge of the projections is even less than 15 °. This further reduces the notch factor.
  • the angles ⁇ , ⁇ are different in size on different sides of the projection 3, ie have different values.
  • a protrusion 3 is characterized in that the protrusion 3 projects beyond the surface of the wax model 1 into protrusions 11 of the model 9. It will be a length of about 1 to 2 mm. Such an arrangement is advantageous because there is a clearer delimitation of the edges of the recess 5 on the finished casting 6. A thin cast skin or "frayed" edges can on the outside of the casting 6 at a projection 3 according to the Fig. 3a arise, which requires an additional post-processing of the resulting recesses 5.
  • the embodiment according to the FIG. 3b with protruding projections 3 also has the advantage that the projections 3 are visible after removal of the model mold 9 from the outside, so that the resulting recesses 5 are easier to find. The subsequent process steps are thus easier and more accurate to carry out.
  • the recesses 5 from the outer surface of the casting 6 forth a recess 8 wholly or partially ground or eroded. This can generally be done in cylindrical ( Fig. 4a ) or conical shape ( Fig. 4b ) happen.
  • the casting skin or "frayed edges" which by the embodiment of the Fig. 3a arise, are removed in this way.
  • the notch factor at the recesses 5 is reduced thereby.
  • This recess 8 should have at least a depth of 0.1 mm. As a rule, a depth of 1 to 2 mm is chosen.
  • the FIGS. 5a, b show what additional process steps are necessary to process the recesses 5 on the finished casting 6.
  • the recess 8 is closed with a pin 7, which may be round, conical or cylindrical and may also have different lengths.
  • the pin 7 can be soldered or welded into the casting 6 or attached by any other suitable process.
  • a pin 7 may correspond to the length of the recess 8, but it may also be longer or shorter.
  • the conical recess 8 is closed with a ball. To avoid long welding times, this ball is by means of a Wiederstandsticians Kunststoffs Kunststoffs to the contact surfaces of the recess welded. Thereafter, the ball can be ground flush with the component surface, so that the remaining part fills the recess 8 as a pin 7.
  • the closing of the recesses 8 also reduces the consumption of the cooling air, since leakage is prevented.
  • Another advantage of the closure is that local overheating of the edges of the recesses 5 is prevented. This can occur when cleaning coated blades, for example by

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Claims (5)

  1. Procédé de fabrication d'une pièce moulée (6) pour une turbomachine thermique par un procédé de coulée connu, la pièce moulée (6) étant fabriquée au moyen d'un moule de coulée en céramique, ce moule de coulée en céramique étant fabriqué au moyen d'un modèle en cire (1) et au moyen d'un insert (2) en céramique se trouvant dans le modèle en cire (1), le modèle en cire (1) étant fabriqué par un moule de modèle (9) et par l'insert (2) en céramique se trouvant dans le moule de modèle (9), et des projections (3) se trouvant du côté extérieur de l'insert (2) en céramique pour respecter une tolérance d'épaisseur de paroi de la pièce moulée (6), grâce auxquelles les évidements (5) sont fabriqués sur la pièce moulée (6) à travers les projections (3) de l'insert (2) en céramique, les projections présentant un angle (α, β) entre l'axe médian (10) et l'arête extérieure des projections (3) inférieur à 30 °,
    caractérisé en ce que
    les évidements (5) créés sur la pièce moulée (6) à travers les projections (3) sont complètement ou partiellement meulés ou érodés depuis le côté extérieur de la pièce moulée (6) pour former un moule partiellement conique ou cylindrique, de sorte qu'il s'y forme des évidements (8), que des broches cylindriques, coniques ou rondes (7) soient montées dans ces évidements (8) sur le côté extérieur de la pièce moulée (6), en particulier par brasage ou soudage, et que de cette manière les évidements (8) soient fermés depuis le côté extérieur de la pièce moulée (6).
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    des évidements (5) sont créés sur la pièce moulée (6) à travers les projections (3) de l'insert (2) en céramique, les projections (3) présentant un angle (α, β) entre l'axe médian (10) et l'arête extérieure des projections (3) inférieur à 15°.
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que
    des évidements (5) sont créés sur la pièce moulée (6) à travers les projections (3) de l'insert (2) en céramique, les projections (3) présentant, sur des côtés différents, des angles (α, β) différents entre l'axe médian (10) et l'arête extérieure des projections (3).
  4. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que
    des évidements (5) sont créés sur la pièce moulée (6) à travers les projections (3) de l'insert (2) en céramique, les projections (3) pénétrant dans le moule de modèle (9) pendant le procédé de moulage.
  5. Procédé selon la revendication 3,
    caractérisé en ce que
    le matériau en excès qui est formé à la surface de la pièce moulée (6) pendant le procédé de moulage autour des projections (3) en saillie, est éliminé.
EP01128084A 2000-12-04 2001-11-27 Procédé de fabrication d'une pièce moulée, modèle et insert utilisés dans ce procédé Expired - Lifetime EP1211001B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10060141A DE10060141A1 (de) 2000-12-04 2000-12-04 Verfahren zur Herstellung eines Gussteils, Modellform und keramischer Einsatz zum Gebrauch in diesem Verfahren
DE10060141 2000-12-04

Publications (3)

Publication Number Publication Date
EP1211001A2 EP1211001A2 (fr) 2002-06-05
EP1211001A3 EP1211001A3 (fr) 2003-07-16
EP1211001B1 true EP1211001B1 (fr) 2009-03-25

Family

ID=7665686

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01128084A Expired - Lifetime EP1211001B1 (fr) 2000-12-04 2001-11-27 Procédé de fabrication d'une pièce moulée, modèle et insert utilisés dans ce procédé

Country Status (4)

Country Link
US (1) US6695036B2 (fr)
EP (1) EP1211001B1 (fr)
JP (1) JP2002178101A (fr)
DE (2) DE10060141A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE467749T1 (de) * 2002-01-17 2010-05-15 Siemens Ag Gegossene turbinenleitschaufel mit hakensockel
GB201415726D0 (en) 2014-09-05 2014-10-22 Rolls Royce Plc Casting of engine parts
KR101905993B1 (ko) * 2016-10-31 2018-10-10 현대자동차주식회사 차량용 내장재 및 그 성형 방법

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3690367A (en) * 1968-07-05 1972-09-12 Anadite Inc Apparatus for the restructuring of metals
US3763926A (en) * 1971-09-15 1973-10-09 United Aircraft Corp Apparatus for casting of directionally solidified articles
DE4042499C2 (de) * 1990-12-21 1995-05-04 Marianne Wieser Gießform zum Herstellen von Formwerkstücken
US5296308A (en) * 1992-08-10 1994-03-22 Howmet Corporation Investment casting using core with integral wall thickness control means
US5291654A (en) * 1993-03-29 1994-03-08 United Technologies Corporation Method for producing hollow investment castings
FR2711562B1 (fr) 1993-10-29 1995-12-15 Sintertech Procédé de fabrication de pièces frittées conjuguées.
DE19539770A1 (de) * 1995-06-20 1997-01-02 Abb Research Ltd Verfahren zur Herstellung eines gerichtet erstarrten Gießkörpers und Vorrichtung zur Durchführung dieses Verfahrens
DE19636968B4 (de) * 1996-09-12 2008-08-07 Steinbeis Transferzentrum Arbeitsgemeinschaft Metallguss An Der Fachhochschule Aalen Verfahren zur Herstellung von metallischen Prototypen
US6199746B1 (en) * 1999-08-02 2001-03-13 General Electric Company Method for preparing superalloy castings using a metallurgically bonded tapered plug

Also Published As

Publication number Publication date
JP2002178101A (ja) 2002-06-25
DE50114786D1 (de) 2009-05-07
US6695036B2 (en) 2004-02-24
EP1211001A3 (fr) 2003-07-16
DE10060141A1 (de) 2002-06-06
EP1211001A2 (fr) 2002-06-05
US20020129924A1 (en) 2002-09-19

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