EP0237400B1 - Procédé de préparation de noyaux céramiques - Google Patents

Procédé de préparation de noyaux céramiques Download PDF

Info

Publication number
EP0237400B1
EP0237400B1 EP87400415A EP87400415A EP0237400B1 EP 0237400 B1 EP0237400 B1 EP 0237400B1 EP 87400415 A EP87400415 A EP 87400415A EP 87400415 A EP87400415 A EP 87400415A EP 0237400 B1 EP0237400 B1 EP 0237400B1
Authority
EP
European Patent Office
Prior art keywords
core
wax
ceramic cores
mold
mould
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
Application number
EP87400415A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0237400A1 (fr
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
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 filed Critical Societe Nationale dEtude et de Construction de Moteurs dAviation SNECMA
Publication of EP0237400A1 publication Critical patent/EP0237400A1/fr
Application granted granted Critical
Publication of EP0237400B1 publication Critical patent/EP0237400B1/fr
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 1 or flow-disturbing elements and stiffeners 1 which delimit internal cavities of the blade. These elements determine the corresponding cavities arranged on the ceramic core 1 which thus has complex and very fine elements 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 10a arranged on one face of the model core 10 makes it possible to obtain a first part 4 of elastomer mold constituting a face of the mold then a second part 5 of mold constituting a second face of the mole, as shown in FIG. 6.
  • the mold 6 of elastomer thus has the imprints, respectively 6a and 6b, on both sides 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 in transferring the mold 6 onto the support plate 7a of an injection pressure 7 schematically represented in FIG. 7.
  • a head 7b is fitted onto the mold 6 and injects the liquid wax into the mold 6 where the channels 6c convey the wax by fine channels to the cavities 1a, 1b or 1 of the ceramic core 1.
  • the press 7 used is of power adapted 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.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP87400415A 1986-02-27 1987-02-25 Procédé de préparation de noyaux céramiques Expired EP0237400B1 (fr)

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 EP0237400A1 (fr) 1987-09-16
EP0237400B1 true EP0237400B1 (fr) 1989-01-18

Family

ID=9332574

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87400415A Expired EP0237400B1 (fr) 1986-02-27 1987-02-25 Procédé de préparation de noyaux céramiques

Country Status (7)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2823455A1 (fr) * 2001-04-17 2002-10-18 Howmet Res Corp Procede et dispositif pour former des elements positionneurs sur un noyau ceramique

Families Citing this family (18)

* 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
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
US9272324B2 (en) 2009-12-08 2016-03-01 Siemens Energy, Inc. Investment casting process for hollow components
KR20130008511A (ko) * 2010-12-07 2013-01-22 미크로 시스템즈, 인코포레이티드 가요성 왁스 패턴 공구를 이용하는 인베스트먼트 주조
US20130333855A1 (en) * 2010-12-07 2013-12-19 Gary B. Merrill Investment casting utilizing flexible wax pattern tool for supporting a ceramic core along its length during wax injection
US20160001354A1 (en) * 2013-03-01 2016-01-07 United Technologies Corporation Gas turbine engine component manufacturing method and core for making same
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

Family Cites Families (6)

* 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
GB789722A (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
GB2053047B (en) * 1979-07-07 1983-01-26 Rolls Royce Cores for lost wax casting
US4283835A (en) * 1980-04-02 1981-08-18 United Technologies Corporation Cambered core positioning for injection molding
GB2150874B (en) * 1983-12-07 1986-07-09 Rolls Royce Investment casting

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2823455A1 (fr) * 2001-04-17 2002-10-18 Howmet Res Corp Procede et dispositif pour former des elements positionneurs sur un noyau ceramique

Also Published As

Publication number Publication date
IN168394B (enrdf_load_stackoverflow) 1991-03-23
EP0237400A1 (fr) 1987-09-16
FR2594727B1 (fr) 1988-05-06
US4732204A (en) 1988-03-22
DE3760041D1 (en) 1989-02-23
FR2594727A1 (fr) 1987-08-28
JPH0438498B2 (enrdf_load_stackoverflow) 1992-06-24
IL81696A (en) 1990-02-09
IL81696A0 (en) 1987-09-16
JPS62220244A (ja) 1987-09-28

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