EP0237400A1 - Verfahren zur Präparation von keramischen Kernen - Google Patents

Verfahren zur Präparation von keramischen Kernen Download PDF

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Publication number
EP0237400A1
EP0237400A1 EP87400415A EP87400415A EP0237400A1 EP 0237400 A1 EP0237400 A1 EP 0237400A1 EP 87400415 A EP87400415 A EP 87400415A EP 87400415 A EP87400415 A EP 87400415A EP 0237400 A1 EP0237400 A1 EP 0237400A1
Authority
EP
European Patent Office
Prior art keywords
core
wax
mold
ceramic cores
model
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.)
Granted
Application number
EP87400415A
Other languages
English (en)
French (fr)
Other versions
EP0237400B1 (de
Inventor
Jacky Pierre Tabardin
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.)
Safran Aircraft Engines SAS
Original Assignee
Societe Nationale dEtude et de Construction de Moteurs dAviation SNECMA
SNECMA SAS
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 Societe Nationale dEtude et de Construction de Moteurs dAviation SNECMA, SNECMA SAS filed Critical Societe Nationale dEtude et de Construction de Moteurs dAviation SNECMA
Publication of EP0237400A1 publication Critical patent/EP0237400A1/de
Application granted granted Critical
Publication of EP0237400B1 publication Critical patent/EP0237400B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/18—Finishing
    • 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

Definitions

  • the present invention relates to a process for the preparation of ceramic cores intended for use in precision casting for the casting of parts obtained by methods of the lost wax type.
  • the method according to the invention aims to solve these problems without being subject to the disadvantages previously encountered.
  • This method is characterized in that before an operation of coating the core with the model wax, an operation of filling with wax the cavities of the core is carried out, during which the said core is enclosed in a flexible mold and the wax liquid is injected into the mold by means of an injection press of suitable power.
  • the ceramic core 1 shown in Figure 1 is an example of application of the invention.
  • This core 1 is used in precision casting for the casting of a turbine blade by a process of the lost wax kind.
  • This type of blade has sophisticated internal cooling devices.
  • the example shown thus shows internal walls 1a and various pins 1b or flow-disturbing elements and stiffeners 1c which delimit internal cavities of the blade. These elements determine the corresponding cavities fitted on the ceramic core 1 which thus has complex elements and great finesse from which it also results in great fragility.
  • a ceramic core 1 must be coated with model wax.
  • Figures 2 and 3 show a model core 10 which is similar to the prepared core to obtain.
  • This model core 10 is used for the production by molding of a mold made of flexible material, for example of the silicone elastomer type.
  • Figures 4 and 5 show an example of implementation of this operation.
  • Two model cores 10, for example, are placed in a molding box 2 on a starting layer 3.
  • a common molding process using an injection channel 10 arranged on one face of the model core 10 makes it possible to obtain a first part 4 of the elastomer mold constituting one face of the mold then a second part 5 of the mold constituting a second face of the mole, as shown in FIG. 6.
  • the elastomer mold 6 thus has the imprints, respectively 6a and 6b, from the two faces of a model core 10.
  • An injection channel 6c is also provided on the mold 6.
  • the method according to the invention consists in placing the bare ceramic cores 1 in a mold 6 made of silicone elastomer and to transfer the mold 6 onto the support plate 7a of an injection pressure 7 schematically represented in FIG. 7.
  • An injection head 7b fits onto the mold 6 and injects the liquid wax into the mold 6 where the channels 6c convey the wax through fine channels to the cavities 1a, 1b or 1c of the ceramic core 1.
  • the press 7 used is of power suited to the process and the adjustment of the injection pressure is between 1 and 5 bars.
  • a plate 7c of the press 7 also applies a clamping pressure to the mold 6, the value of which is determined as a function of the setting of the injection pressure.
  • the method according to the invention which has just been described has numerous advantages compared to the long and delicate manual operations which it was previously necessary to use. Cycle times are significantly reduced.
  • a manual operation time is estimated at 3 to 6 minutes per nucleus, while the method according to the invention reduces the operation to half a minute per nucleus.
  • the process reduces the handling of nuclei and consequently limits the risks of breakage which are high due to the fragility of the nuclei.
  • the wax deposit obtained is more regular and a repetitive and reproducible quality is obtained.
EP87400415A 1986-02-27 1987-02-25 Verfahren zur Präparation von keramischen Kernen Expired EP0237400B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8602700A FR2594727B1 (fr) 1986-02-27 1986-02-27 Procede de preparation de noyaux ceramiques
FR8602700 1986-02-27

Publications (2)

Publication Number Publication Date
EP0237400A1 true EP0237400A1 (de) 1987-09-16
EP0237400B1 EP0237400B1 (de) 1989-01-18

Family

ID=9332574

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87400415A Expired EP0237400B1 (de) 1986-02-27 1987-02-25 Verfahren zur Präparation von keramischen Kernen

Country Status (7)

Country Link
US (1) US4732204A (de)
EP (1) EP0237400B1 (de)
JP (1) JPS62220244A (de)
DE (1) DE3760041D1 (de)
FR (1) FR2594727B1 (de)
IL (1) IL81696A (de)
IN (1) IN168394B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011070557A3 (en) * 2009-12-08 2011-11-24 Siemens Energy, Inc. Investment casting utilizing flexible wax pattern tool
RU2684004C2 (ru) * 2013-05-03 2019-04-03 Сименс Энерджи, Инк. Литье по выплавляемым моделям с использованием гибкого приспособления, предназначенного для изготовления восковой литейной модели, для обеспечения опоры для керамического стержня вдоль его длины во время впрыска воска

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2205261B (en) * 1987-06-03 1990-11-14 Rolls Royce Plc Method of manufacture and article manufactured thereby
JPH01118334A (ja) * 1987-10-31 1989-05-10 Morikawa Sangyo Kk 鋳造用消失性模型の接着方法及びそれに用いる装置
JPH02253912A (ja) * 1989-03-28 1990-10-12 Aisin Chem Co Ltd ドアチェック用レバーの製造方法
US5028239A (en) * 1989-05-12 1991-07-02 Nalco Chemical Company Fuel dewatering additives
US5524695A (en) * 1993-10-29 1996-06-11 Howmedica Inc. Cast bone ingrowth surface
US5773039A (en) * 1996-04-01 1998-06-30 Jones; Earl S. Apparatus for multiple wax castings
US6561428B2 (en) * 1997-10-17 2003-05-13 Hand Held Products, Inc. Imaging device having indicia-controlled image parsing mode
US6505678B2 (en) * 2001-04-17 2003-01-14 Howmet Research Corporation Ceramic core with locators and method
DE10310987B3 (de) * 2003-03-07 2004-04-08 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Werkzeugmaschine und Verfahren zur Herstellung von dreidimensionalen Bauteilen
US7296615B2 (en) * 2004-05-06 2007-11-20 General Electric Company Method and apparatus for determining the location of core-generated features in an investment casting
CA2567936C (en) 2006-11-14 2016-01-05 Atomic Energy Of Canada Limited Device and method for surface replication
EP1930096A1 (de) * 2006-12-07 2008-06-11 Siemens Aktiengesellschaft Verfahren zum Herstellen eines Modells für die feingusstechnische Darstellung einer wenigstens einen Hohlraum aufweisenden Komponente
JP5518208B2 (ja) * 2010-12-07 2014-06-11 シーメンス エナジー インコーポレイテッド 柔軟なワックスパターンツールを利用するインベストメント鋳造
EP2961547A4 (de) * 2013-03-01 2016-11-23 United Technologies Corp Herstellungsverfahren für gasturbinenmotorkomponente und kern zur herstellung davon
US10189186B2 (en) * 2014-05-16 2019-01-29 Ford Global Technologies, Llc Method for finishing matching surfaces in forming tool components
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
CN110340286B (zh) * 2019-07-16 2021-07-16 北京航空材料研究院有限公司 一种高表面光洁度钛合金熔模精密铸件的制备方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB789721A (en) * 1954-03-09 1958-01-29 Rolls Royce Improvements relating to casting processes for metals
DE1508663B1 (de) * 1966-02-02 1970-06-25 Howe Sound Company, New York, N y (V.St.A.) Verfahren und Vorrichtung zum Herstellen von Ausschmelzmodellen für das Präzisionsgießverfahren
GB2053047A (en) * 1979-07-07 1981-02-04 Rolls Royce Cores for lost wax casting
GB2150874A (en) * 1983-12-07 1985-07-10 Rolls Royce Investment casting

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR789721A (fr) * 1935-05-08 1935-11-05 Indicateur de direction pour bicyclettes, motocyclettes et charrettes
US4283835A (en) * 1980-04-02 1981-08-18 United Technologies Corporation Cambered core positioning for injection molding

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB789721A (en) * 1954-03-09 1958-01-29 Rolls Royce Improvements relating to casting processes for metals
DE1508663B1 (de) * 1966-02-02 1970-06-25 Howe Sound Company, New York, N y (V.St.A.) Verfahren und Vorrichtung zum Herstellen von Ausschmelzmodellen für das Präzisionsgießverfahren
GB2053047A (en) * 1979-07-07 1981-02-04 Rolls Royce Cores for lost wax casting
GB2150874A (en) * 1983-12-07 1985-07-10 Rolls Royce Investment casting

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011070557A3 (en) * 2009-12-08 2011-11-24 Siemens Energy, Inc. Investment casting utilizing flexible wax pattern tool
RU2684004C2 (ru) * 2013-05-03 2019-04-03 Сименс Энерджи, Инк. Литье по выплавляемым моделям с использованием гибкого приспособления, предназначенного для изготовления восковой литейной модели, для обеспечения опоры для керамического стержня вдоль его длины во время впрыска воска

Also Published As

Publication number Publication date
IL81696A (en) 1990-02-09
FR2594727B1 (fr) 1988-05-06
US4732204A (en) 1988-03-22
JPS62220244A (ja) 1987-09-28
JPH0438498B2 (de) 1992-06-24
FR2594727A1 (fr) 1987-08-28
DE3760041D1 (en) 1989-02-23
IL81696A0 (en) 1987-09-16
EP0237400B1 (de) 1989-01-18
IN168394B (de) 1991-03-23

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