EP1970142B1 - Procédé de soudure fine de composants métalliques dotés de canaux de passage fins - Google Patents

Procédé de soudure fine de composants métalliques dotés de canaux de passage fins Download PDF

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Publication number
EP1970142B1
EP1970142B1 EP08150863A EP08150863A EP1970142B1 EP 1970142 B1 EP1970142 B1 EP 1970142B1 EP 08150863 A EP08150863 A EP 08150863A EP 08150863 A EP08150863 A EP 08150863A EP 1970142 B1 EP1970142 B1 EP 1970142B1
Authority
EP
European Patent Office
Prior art keywords
wax
ceramic core
ceramic
casting
stiffening
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 - Fee Related
Application number
EP08150863A
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German (de)
English (en)
Other versions
EP1970142A1 (fr
Inventor
Richard Whitton
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.)
Rolls Royce Deutschland Ltd and Co KG
Original Assignee
Rolls Royce Deutschland Ltd and Co KG
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 Rolls Royce Deutschland Ltd and Co KG filed Critical Rolls Royce Deutschland Ltd and Co KG
Publication of EP1970142A1 publication Critical patent/EP1970142A1/fr
Application granted granted Critical
Publication of EP1970142B1 publication Critical patent/EP1970142B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B22C9/108—Installation of cores

Definitions

  • the invention relates to a method for investment casting of metal components with very thin through channels by the lost wax process, in particular of turbine blades, in which formed between shell molds with a ceramic core provided therein for forming a cavity in the metallic component by injecting a wax mass and after the removal of the shell molds on the outer surface of the wax model in a dipping and Besandungslui a ceramic mold is produced, which is fired after melting the wax mass and then poured with a molten metal and the mold and the ceramic core then destroyed and removed.
  • a non-meltable mold (wax mold, mold shell) is first produced from a master model in which a wax model consisting of a fusible material, in particular a special wax, is produced in a casting process.
  • the wax models provided with a casting system are assembled into model screws and then coated with a refractory material in a multiple immersion and Besandungslui.
  • the wax model is then melted out and then the remaining shape of refractory material is fired into a ceramic casting mold.
  • the liquid metal is poured to produce the desired components. After the solidification of the metal become the ceramic Molds destroyed.
  • the JP 2000 246392 A discloses a method of making wax models for investment casting.
  • the method consists in determining particularly fracture-risk areas of the ceramic core and providing them with wax prior to the actual wax spraying in order to reinforce them and thus to prevent the breaking of the ceramic core during the actual spraying of the casting model.
  • a ceramic core is coated with wax and then formed around the wax layer by repeated dipping in a ceramic binder and Besanden a ceramic mold, which is fired after the removal of the wax.
  • the free space left by the melting of the wax between the core and the shell mold is poured out with molten metal to form the turbine blade. Movements of the core during pouring can be prevented by metallic positioning aids mounted in the ceramic core. After pouring and solidifying the metal, the ceramic core and the ceramic casting shell are destroyed and removed. Subsequently, the casting is machined and the positioning aids are removed again.
  • cooling channels profilings are formed on the ceramic core.
  • the invention has for its object to provide a precision casting on the basis of lost wax for the production of turbine blades with through channels, which also allows the production of very thin through-channels in the casting process.
  • the ceramic core pins positioned in the mold intended for the formation of the wax model are integrally formed on the ceramic core, which is arranged to form a cavity in the relevant component in the wax model mold.
  • the stiffening layer is reinforced by fibers to increase the strength and rigidity of the stiffening layer.
  • the stiffening layer may consist of wax or similar thermoplastic materials which melt together with the wax model material.
  • cooling ducts with a small diameter and in different, for example conical or curved, form are required to improve the efficiency of the engine.
  • Turbine vane 1 which is only partially illustrated, starts from a cavity 3 formed in the blade root 2 as a passage channel 4 with a very small diameter acting as a microturbine nozzle for the passage of cooling air. Together with the investment casting of the turbine blade 1 by the lost-wax process, the cavity 3 and also the through-channel 4 are produced.
  • Fig. 2 are a ceramic core 5 for forming the cavity 3 and an integrally formed thin ceramic core pin 6 for forming the equally thin through-channel 4 is shown, which - according to the lost wax process - for the production of the ceramic mold first in an existing form of solid shell wax mold (not shown) with a is enclosed in this pressed wax mass 7.
  • the brittle ceramic core pin 6 can easily break due to its small diameter when applying or injecting the wax mass 7, this is coated with a fusible stiffening layer 8 before pressing the wax mass 7 and can therefore during this process step not destroyed or damaged.
  • the injected wax mass 7 and the fusible stiffening layer 8 are finally melted out and the ceramic casting mold is fired.
  • the ceramic casting mold is then poured out with a planned for the turbine blade 1 molten metal alloy. In the subsequent process step, the ceramic casting mold and the ceramic core 5 and the ceramic core pin 6 are destroyed and removed.
  • the fusible stiffening layer 8 consists of a fiber-reinforced wax or other thermoplastic material that can be easily melted out during the lost wax from the ceramic mold.
  • the invention is not limited to the previously explained application. It can always be used in casting by the lost wax casting turbine blades or other components where thin channels can no longer be produced during casting with a correspondingly thin ceramic core and otherwise separate production of thin through-channels is too expensive, for example, in a support structure in the area of the guide vanes of a turbine stage to form a very narrow pre-swirl nozzle or to form very thin channels in the turbine blade tips.

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

Claims (3)

  1. Procédé selon la méthode à cire perdue pour le moulage de précision de composants métalliques avec conduits traversants (4) très fins, en particulier d'aubes de turbine (1), dans lequel un modèle en cire est formé par injection d'une masse de cire (7) entre des coques de moulage avec un noyau céramique positionné dedans prévu pour constituer une cavité (3) dans le composant métallique, et après le retrait des coques de moulage sur la surface extérieure du modèle en cire, est fabriqué par un processus d'immersion et de sablage un moule céramique qui, après la fonte de la masse de cire (7), est cuit puis rempli d'un métal en fusion, et ensuite, le moule et le noyau céramique (5) sont détruits et retirés, sachant,
    a) qu'est formée une broche de noyau céramique (6) d'un diamètre coïncidant avec le diamètre du conduit traversant très fin (4),
    b) que la broche de noyau céramique (6) est façonnée sur le noyau céramique (5) qui sera enrobé par la masse de cire (7), et
    c) qu'avant l'injection de la masse de cire (7), la broche de noyau céramique (6) est enveloppée et stabilisée par une couche raidisseuse fusible (8), qui sera fondue avec la masse de cire (7),
    caractérisé en ce que la couche raidisseuse (8) est renforcée par un matériau fibreux.
  2. Procédé selon la revendication n° 1, caractérisé en ce que la couche raidisseuse (8) est constituée de cire ou d'un autre matériau thermoplastique.
  3. Procédé selon la revendication n° 1, caractérisé en ce que la broche de noyau céramique (6) est formée de manière conique ou arquée conformément au tracé des conduits traversants (4).
EP08150863A 2007-03-09 2008-01-31 Procédé de soudure fine de composants métalliques dotés de canaux de passage fins Expired - Fee Related EP1970142B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007012321A DE102007012321A1 (de) 2007-03-09 2007-03-09 Verfahren zum Feingießen von metallischen Bauteilen mit dünnen Durchgangskanälen

Publications (2)

Publication Number Publication Date
EP1970142A1 EP1970142A1 (fr) 2008-09-17
EP1970142B1 true EP1970142B1 (fr) 2011-09-28

Family

ID=39325914

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08150863A Expired - Fee Related EP1970142B1 (fr) 2007-03-09 2008-01-31 Procédé de soudure fine de composants métalliques dotés de canaux de passage fins

Country Status (3)

Country Link
US (1) US8096343B2 (fr)
EP (1) EP1970142B1 (fr)
DE (1) DE102007012321A1 (fr)

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US9315663B2 (en) 2008-09-26 2016-04-19 Mikro Systems, Inc. Systems, devices, and/or methods for manufacturing castings
EP2462079A4 (fr) * 2009-08-09 2015-07-29 Rolls Royce Corp Support pour un article cuit
US8813824B2 (en) 2011-12-06 2014-08-26 Mikro Systems, Inc. Systems, devices, and/or methods for producing holes
CN103056302A (zh) * 2011-12-13 2013-04-24 丹阳市精密合金厂有限公司 航空发动机机匣类环形铸件空心支板成型用陶瓷型芯
CN103056303A (zh) * 2011-12-13 2013-04-24 丹阳市精密合金厂有限公司 一种支板成型用陶瓷型芯
CN102601306A (zh) * 2012-03-31 2012-07-25 四川德力铁道科技有限公司 一种适用于蜡模精铸工艺的模料模组的热水脱蜡方法
DE102013016868A1 (de) * 2013-10-11 2015-04-16 Flc Flowcastings Gmbh Feingussverfahren hohler Bauteile
CN103706760B (zh) * 2014-01-06 2016-06-22 安徽厚林精密金属科技有限公司 一种绞肉机顶盖的精密铸造方法
US10507515B2 (en) 2014-12-15 2019-12-17 United Technologies Corporation Ceramic core for component casting
CN107790644A (zh) * 2017-11-09 2018-03-13 东方电气集团东方汽轮机有限公司 一种防止空心叶片蜡模变形的方法
US11179769B2 (en) 2019-02-08 2021-11-23 Raytheon Technologies Corporation Investment casting pin and method of using same
CN112077261B (zh) * 2019-06-13 2021-10-08 中国航发商用航空发动机有限责任公司 一种多孔铸件的制备工艺
US11642720B2 (en) 2019-10-16 2023-05-09 Raytheon Technologies Corporation Integral core bumpers
US11326470B2 (en) * 2019-12-20 2022-05-10 General Electric Company Ceramic matrix composite component including counterflow channels and method of producing
CN113441688B (zh) * 2021-06-30 2022-07-08 共享装备股份有限公司 一种芯撑及使用方法

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Also Published As

Publication number Publication date
US8096343B2 (en) 2012-01-17
DE102007012321A1 (de) 2008-09-11
EP1970142A1 (fr) 2008-09-17
US20080216983A1 (en) 2008-09-11

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