EP1595618A1 - Procédé de fonderie à cire perdue avec couche de contact - Google Patents
Procédé de fonderie à cire perdue avec couche de contact Download PDFInfo
- Publication number
- EP1595618A1 EP1595618A1 EP05103895A EP05103895A EP1595618A1 EP 1595618 A1 EP1595618 A1 EP 1595618A1 EP 05103895 A EP05103895 A EP 05103895A EP 05103895 A EP05103895 A EP 05103895A EP 1595618 A1 EP1595618 A1 EP 1595618A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- process according
- slip
- layer
- particles
- agent
- 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
Links
Classifications
-
- 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 present invention relates to the manufacture of parts such as blading complex geometries according to the technique known as lost wax foundry.
- a model wax or other equivalent material easily removable by the following. If necessary, we group together several models into one cluster. We made around this model a ceramic mold by soaking in a first slip to form a first layer of material in contact with its area. Sand the surface of this layer to reinforce and facilitate the hanging of the next layer, and we dry the whole: what constitutes respectively the stuccage and drying operations. We then repeat the soaking operation in slip of possible compositions different, operation always associated with the successive operations of stuccage and drying. Thus, a ceramic shell consisting of a plurality of layers.
- the slips are composed of particles of ceramic materials, flour, such as alumina, mullite, zircon or the like, with a mineral colloidal binder and adjuvants, if any, depending on the rheology desired.
- These adjuvants make it possible to control and stabilize characteristics of the different types of layers, while avoiding the effects of different physicochemical characteristics of raw materials constituting the slips. It can be a wetting agent, a plasticizer or a texturizer based, for the latter, the desired thickness for the deposit.
- the carapace mold is then dewaxed, which is an operation by which eliminates the material constituting the original model. After elimination of the model, we obtain a ceramic mold whose cavity reproduces all the details of the model. The mold then undergoes heat treatment at high temperature or "cooking" which gives it the mechanical properties required. The carapace mold is thus ready for the production of the piece metal casting.
- the step The next step is to sink a molten metal into the mold cavity and then to the solidify.
- solidification techniques In the field of lost-wax foundry, one distinguishes currently several solidification techniques, so several techniques of casting, depending on the nature of the alloy and the expected properties of the resulting part of the casting. It may be directed solidification with columnar structure (DS), directed solidification with monocrystalline structure (SX) or solidification equiaxe (EX) respectively.
- DS columnar structure
- SX monocrystalline structure
- EX solidification equiaxe
- the shell is broken by a shakeout operation, and it completes the manufacture of the metal part.
- the carapaces can be made from different fillers, based on silico-aluminous, silica-zircon or silica.
- the first layer for each of these carapaces plays a vital role. She constitutes the interface between the shell mold and the cast alloy. It must, in the case of a solidification directed to columnar or monocrystalline structure, to be non-reactive with the cast alloy. In the case of equiaxed solidification, it must allow equiaxial germination of the grains. Moreover, the integrity of this Contact layer determines the final quality of the casting, in terms of condition surface especially.
- the first layer must meet certain requirements in order to avoid defects such as ceramic decohesions, and surface defects.
- the decohesions of the contact layer before or during the casting can generate harmful marks on parts.
- the surface defects result from excessive micro porosity of the contact that generates surplus forming reliefs on the surface of the pieces.
- Major surface defects are often the result of a phenomenon surface capillary at the interface between the wax model and the first layer.
- the grains of sand form stacks, which have many capillaries. Each acts like a sucker that gives rise to a depression. This one is all larger than the capillary is small. This corresponds to a first layer insufficient thickness. Depression promotes a capillary rise of the slip to the stucco and this, until the column of liquid thus formed restore the pressure difference. It follows the formation of a withdrawal zone with cavity which leads to the formation of surface defects. This phenomenon is accentuated by a first layer of thickness too weak.
- the properties of the contact layer must therefore make it possible to find a compromise between these antagonistic characteristics, in order to be free from all defects on parts.
- the invention achieves these objectives with the following method.
- the multi-shell ceramics mold manufacturing process layers including at least one contact layer from a wax model or other similar material, including dipping the model in a slip containing ceramic particles and a binder, and adjuvants, so as to forming said contact layer, depositing sand particles on the layer and drying said contact layer.
- the process is characterized in that the ceramic particles of said slip are mullite particles.
- the adjuvants comprise an agent wetting agent, a fluidifying agent and a texturing agent.
- composition of the slip it is possible to fulfill the objectives assigned to all foundry molds, whose properties satisfy the requirements of casting conditions in particular meeting the constraints of solidification DS and SX.
- the contact layer is not reactive against cast superalloys.
- the slip is advantageously composed of mullite flour in a quantity of between 65 and 90% by weight, without zircon.
- sand particles or "stuccos" for this contact layer, are formed from mullite grains and not from zircon.
- adjuvants in the slip allows to control deposits on wax and to ensure optimal characteristics in terms of thickness and distribution on parts.
- the binder is a water-based mineral colloidal solution, such as colloidal silica, and not a alcohol base binder.
- contact layer on wax associated with a reinforcement by dusting of a mullite sand with a particle size between 80 and 250 microns to obtain a very good cohesion of first layer and very good states of surface of castings.
- the method of manufacturing the shell molds comprises a first step of manufacture of the model in wax or other equivalent material known in the field.
- the most commonly known is wax.
- the models are shaped to the dimensions of the final pieces, at removal near alloys.
- the carapace manufacturing steps are preferably carried out by a robot whose movements are programmed to have an optimal action on the quality of the deposits made, and to overcome the geometrical aspect of different vanes.
- slips are prepared in which they are quenched successively the models or the cluster to make deposits of materials ceramics.
- the covered model undergoes a phase of dewatering and then topping.
- mullite whose granulometry in this first layer is fine. It is between 80 and 250 microns. The surface condition of the final pieces depends in part.
- the layer is dried.
- the dipping is then carried out in a second slip to form a so-called "intermediate" layer.
- the model is then quenched in a third slip to form the layer 3 which is the first layer called "reinforcement”.
- the stucco is then applied and dried. We repeat the soaking operations in the third slip, stuccing and drying to obtain the thickness of desired carapace. For the last layer, an operation of icing.
- the second and third slip may comprise a mixture of flours of alumina and mullite in quantities of between 45 and 95% by weight, and mullite grains in amounts between 0 and 25% by weight.
- the carapace can thus comprise from 5 to 12 layers.
- the baking cycle of the molds includes a temperature rise phase during a given period, a plateau at the cooking temperature and a cooling phase.
- the cooking cycle is chosen to optimize the mechanical properties of the shells so as to allow manipulations to cold without risk of breakages, and in order to minimize their sensitivity to shocks thermals that can be generated during the various pouring stages.
- contact layer An example of a shell mold manufacturing process has been described from contact layer according to the invention.
- This contact layer can be associated with all types of layers as needed, even if necessary with layers made from zircon particles.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
Description
- farine de mullite 65 - 80
- liant silice colloïdale 20 - 35
- eau 0-5
- 3 adjuvants organiques qui sont des agents respectivement mouillant, fluidifiant et texturant.
- Le fluidifiant permet d'obtenir plus rapidement la rhéologie désirée lors de la fabrication de la couche. Il agit en tant que dispersant. Il est choisi de préférence parmi les composés suivants : acides aminés, polyacrylates d'ammonium, tri-acides carboxyliques à groupements alcools.
- Le mouillant permet de faciliter le nappage de la couche lors du trempé. Il est de préférence choisi parmi les composés suivants : alcools gras poly-alkylènes, alcools alkoxylates.
- Le texturant permet d'optimiser la rhéologie de la couche afin d'obtenir des dépôt adaptés. Il est choisi de préférence parmi : les polymères de l'oxyde d'éthylène, les gommes de xanthane ou les gommes de guar.
Claims (13)
- Procédé de fabrication de moule carapace céramique à plusieurs couches dont au moins une couche de contact à partir d'un modèle de pièce à fabriquer, en cire ou autre matériau semblable, comprenant le trempage du modèle dans une première barbotine contenant des particules céramiques et un liant pour former la couche de contact, à déposer des particules de sable sur ladite couche et à sécher celle-ci, caractérisé par le fait que les particules céramiques de la première barbotine sont des particules de mullite.
- Procédé selon la revendication 1 selon lequel les particules céramiques ne comprennent pas de zircon.
- Procédé selon la revendication 1 dont la barbotine comprend un agent mouillant, un agent fluidifiant et un agent texturant.
- Procédé selon la revendication 3 dont l'agent mouillant est choisi parmi les alcools gras poly-alkylènes, ou alcools alkoxylates.
- Procédé selon la revendication 3 dont l'agent fluidifiant est choisi parmi les acides aminés, les polyacrylates d'ammonium ou les tri-acides carboxyliques à groupements alcools.
- Procédé selon la revendication 3 dont l'agent texturant est choisi parmi les polymères de l'oxyde d'éthylène, les gommes de xanthane, ou les gommes de guar.
- Procédé selon la revendication 1 dont le liant est à base de solutions colloïdales minérales à base eau, en particulier la silice colloïdale.
- Procédé selon la revendication 1 dont les particules de sable sont formées de grains de mullite.
- Procédé selon la revendication 8 dont les grains ont une granulométrie comprise entre 80 et 250 microns.
- Procédé selon la revendication 1 dont les particules de sable sont appliquées par saupoudrage.
- Procédé selon la revendication 1, dont la barbotine comprend une farine de mullite en quantité comprise entre 65 et 80 en poids.
- Utilisation d'un moule carapace selon l'une des revendications précédentes pour la fabrication d'une pièce avec solidification de type dirigé à structure colonnaire.
- Utilisation d'un moule carapace selon l'une des revendications 1 à 11 pour la fabrication d'une pièce avec solidification de type dirigé à structure monocristalline.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0405145 | 2004-05-12 | ||
| FR0405145A FR2870148B1 (fr) | 2004-05-12 | 2004-05-12 | Procede de fonderie a cire perdue avec couche de contact |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1595618A1 true EP1595618A1 (fr) | 2005-11-16 |
| EP1595618B1 EP1595618B1 (fr) | 2010-11-24 |
Family
ID=34939771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP05103895A Expired - Lifetime EP1595618B1 (fr) | 2004-05-12 | 2005-05-10 | Procédé de fonderie à cire perdue avec couche de contact |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US7370688B2 (fr) |
| EP (1) | EP1595618B1 (fr) |
| JP (1) | JP4918227B2 (fr) |
| CA (1) | CA2507171C (fr) |
| DE (1) | DE602005024887D1 (fr) |
| FR (1) | FR2870148B1 (fr) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11338356B2 (en) | 2016-11-29 | 2022-05-24 | HÜTTENES-ALBERTUS Chemische Werke Gesellschaft mit beschränkter Haftung | Amino acid-containing moulding material mixture for production of mouldings for the foundry industry |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013017547A1 (fr) * | 2011-07-29 | 2013-02-07 | Dsm Ip Assets B.V. | Dispositif médical comprenant un revêtement hydrophile mouillé |
| CN107199309B (zh) * | 2017-06-08 | 2020-02-07 | 淄博金东机械制造有限公司 | 一种铸件模组制壳工艺 |
| FR3068271B1 (fr) | 2017-06-29 | 2021-12-10 | Safran Aircraft Engines | Procede de fonderie avec coulee en moule chaud |
| FR3085286B1 (fr) | 2018-08-28 | 2021-08-06 | Safran Aircraft Engines | Procede de fabrication d'une eprouvette a plusieurs couches ceramiques, eprouvette obtenue par la mise en œuvre d'un tel procede de fabrication et utilisation d'une telle eprouvette pour un essai de compression uniaxiale a chaud |
| CN109261901B (zh) * | 2018-11-26 | 2021-01-05 | 惠州市吉邦精密技术有限公司 | 一种易溃散型壳的制壳工艺 |
| FR3103400B1 (fr) | 2019-11-21 | 2022-08-19 | Safran Aircraft Engines | Moule de fonderie, procede de fabrication du moule et procede de fonderie |
| FR3145299B1 (fr) | 2023-01-27 | 2025-10-24 | Safran Aircraft Engines | Moule de fonderie |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3859153A (en) * | 1970-06-25 | 1975-01-07 | Du Pont | Refractory laminate having improved green strength |
| EP0399727A1 (fr) * | 1989-05-20 | 1990-11-28 | ROLLS-ROYCE plc | Matériau à partir de céramique pour un moule |
| US5618633A (en) | 1994-07-12 | 1997-04-08 | Precision Castparts Corporation | Honeycomb casting |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4363669A (en) * | 1979-12-05 | 1982-12-14 | Merck & Co., Inc. | Dispersible xanthan gum blends |
| DE3602420A1 (de) * | 1986-01-28 | 1987-07-30 | Kempten Elektroschmelz Gmbh | Stabile schlickergussmasse auf basis von feinteiligen aluminiumnitrid-enthaltenden pulvern |
| JPH04224044A (ja) * | 1990-12-25 | 1992-08-13 | Hitachi Ltd | 精密鋳造用高強度鋳型の製造法 |
| US5407480A (en) * | 1993-09-30 | 1995-04-18 | Vinings Industries, Inc. | Stabilized, high solids, low viscosity smectite slurries, and method of preparation |
| JPH07116773A (ja) * | 1993-10-20 | 1995-05-09 | Mitsubishi Heavy Ind Ltd | 精密鋳造用鋳型の製造方法 |
| JPH09155503A (ja) * | 1995-12-05 | 1997-06-17 | Hitachi Ltd | 精密鋳造用鋳型および鋳造方法 |
| US5766329A (en) * | 1996-05-13 | 1998-06-16 | Alliedsignal Inc. | Inert calcia facecoats for investment casting of titanium and titanium-aluminide alloys |
| KR100759182B1 (ko) * | 1996-09-30 | 2007-09-14 | 히다치 가세고교 가부시끼가이샤 | 산화세륨 입자 |
| CN1101284C (zh) * | 1997-01-27 | 2003-02-12 | 联合讯号公司 | 低成本铸造γ-TiAI用的整体式坩埚和铸型 |
| US6431255B1 (en) * | 1998-07-21 | 2002-08-13 | General Electric Company | Ceramic shell mold provided with reinforcement, and related processes |
| WO2001045876A1 (fr) * | 1999-12-21 | 2001-06-28 | Howmet Research Corporation | Moule carapace resistant aux fissures et procede correspondant |
| JP2001232445A (ja) * | 2000-02-23 | 2001-08-28 | Mitsubishi Heavy Ind Ltd | 単結晶精密鋳造用鋳型の製造方法 |
-
2004
- 2004-05-12 FR FR0405145A patent/FR2870148B1/fr not_active Expired - Fee Related
-
2005
- 2005-05-10 DE DE602005024887T patent/DE602005024887D1/de not_active Expired - Lifetime
- 2005-05-10 US US11/125,084 patent/US7370688B2/en not_active Expired - Lifetime
- 2005-05-10 EP EP05103895A patent/EP1595618B1/fr not_active Expired - Lifetime
- 2005-05-11 JP JP2005138393A patent/JP4918227B2/ja not_active Expired - Lifetime
- 2005-05-11 CA CA2507171A patent/CA2507171C/fr not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3859153A (en) * | 1970-06-25 | 1975-01-07 | Du Pont | Refractory laminate having improved green strength |
| EP0399727A1 (fr) * | 1989-05-20 | 1990-11-28 | ROLLS-ROYCE plc | Matériau à partir de céramique pour un moule |
| US5618633A (en) | 1994-07-12 | 1997-04-08 | Precision Castparts Corporation | Honeycomb casting |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11338356B2 (en) | 2016-11-29 | 2022-05-24 | HÜTTENES-ALBERTUS Chemische Werke Gesellschaft mit beschränkter Haftung | Amino acid-containing moulding material mixture for production of mouldings for the foundry industry |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2005349472A (ja) | 2005-12-22 |
| CA2507171C (fr) | 2013-07-09 |
| FR2870148B1 (fr) | 2006-07-07 |
| EP1595618B1 (fr) | 2010-11-24 |
| JP4918227B2 (ja) | 2012-04-18 |
| US7370688B2 (en) | 2008-05-13 |
| CA2507171A1 (fr) | 2005-11-12 |
| US20050252633A1 (en) | 2005-11-17 |
| FR2870148A1 (fr) | 2005-11-18 |
| DE602005024887D1 (de) | 2011-01-05 |
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