EP3980202A1 - Moule de fonderie amélioré pour la formation de noyaux céramiques d'aubes de turbine - Google Patents
Moule de fonderie amélioré pour la formation de noyaux céramiques d'aubes de turbineInfo
- Publication number
- EP3980202A1 EP3980202A1 EP20740372.6A EP20740372A EP3980202A1 EP 3980202 A1 EP3980202 A1 EP 3980202A1 EP 20740372 A EP20740372 A EP 20740372A EP 3980202 A1 EP3980202 A1 EP 3980202A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mold
- primary
- arm
- cavity
- volume
- 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
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/06—Core boxes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/06—Permanent moulds for shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C13/00—Moulding machines for making moulds or cores of particular shapes
- B22C13/12—Moulding machines for making moulds or cores of particular shapes for cores
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
Definitions
- This presentation relates to the field of turbomachines, and relates more specifically to mold filling techniques foundry cores for the production of cores for the production of components of turbomachines.
- Ceramic cores are commonly produced by injection at medium or high pressure.
- a paste comprising a ceramic filler incorporated in a polymeric binder is injected into a mold, thereby making it possible to produce a green body.
- demoulding the latter is then fired, which makes it possible to carry out debinding and sintering steps, consisting respectively of the removal of the binder and the consolidation of the core.
- the wax forming the model of the metal part is injected around the core, the latter thus making it possible to delimit the internal cavity of the part.
- the present disclosure thus aims to respond at least partially to the problems mentioned above.
- the present disclosure thus relates to a mold for producing a ceramic core by injection of a ceramic composition
- the mold comprising a body in which a foundry core cavity is formed, said cavity comprising a primary cavity and a secondary cavity connected by a plurality of segments allowing fluid passage between the primary cavity and the secondary cavity, the primary cavity defining recesses of a turbine engine blade,
- said mold being characterized in that it comprises a primary arm configured so as to allow injection of ceramic composition into the primary cavity, and a secondary arm configured so as to allow injection of ceramic composition into the secondary cavity, and in that that the ratio between the volume of the primary cavity and the volume of the secondary cavity is equal to plus or minus 15% to the ratio between the volume of the primary arm and the volume of the secondary arm.
- the ratio between the contact surface of the primary arm with the body of the mold relative to the volume of the primary arm is equal to plus or minus 20% to the ratio between the contact surface of the secondary arm with the body of the mold relative to the volume of the secondary arm.
- the primary arm and the secondary arm are connected to a common injection orifice of the mold.
- the primary arm and the secondary arm are then typically connected to a supply cavity, the supply cavity being connected to an injection orifice of the mold.
- the segments comprise a plurality of segments each having a section having a dimension less than or equal to 1mm 2 .
- the primary arm and the secondary arm are produced in a parting line of the mold.
- the primary arm and the secondary arm each have a portion of reduced section at the level of their connection with the primary cavity and the secondary cavity respectively.
- This disclosure also relates to a method of producing a foundry ceramic insert for producing a turbine blade, in which
- a ceramic composition is injected into the mold so as to fill the primary cavity and the secondary cavity via the primary arm and the secondary arm respectively.
- a subsequent step of finishing the ceramic insert is carried out in which the ceramic material corresponding to the secondary arm (or to the volume of the secondary arm) is removed.
- the present disclosure also relates to a ceramic core comprising
- a primary branch extending from the primary volume
- a secondary branch extending from a distal end of the secondary body, opposite the proximal end
- a chimney extending in the extension of the tertiary branch, in which the ratio between the volume of the primary body and the volume of the secondary body is equal to 15% close to the ratio between the volume of the primary branch and the volume of the secondary branch.
- FIG. 1 shows an example of a foundry core produced by means of a mold and of a method according to one aspect of the invention.
- Figure 2 illustrates a mold filling step according to one aspect of the invention.
- FIG. 3 illustrates a step of filling the mold according to one aspect of the invention.
- FIG. 4 illustrates a step of filling the mold according to one aspect of the invention.
- the mold 1 may have the shape of a rectangular parallelepiped, it being understood that such a representation does not is not limiting, and that the mold may have any suitable shape, in particular as a function of the geometry of the associated core.
- the mold 1 comprises a body 10 having an internal recess 2 defining an imprint of a foundry core.
- the figures show this recess 2 via the corresponding foundry core. It would indeed have been difficult to read to represent a foundry mold, which is by nature closed.
- the figures thus represent the foundry core associated with each mold 1, these cores being the volumes complementary to the internal recess 2 of the mold 1 considered.
- the mold 1 is an injection mold, typically a mold used for injecting ceramic pastes.
- the recess 2 forms an imprint 20 defining the geometry of a core.
- the cavity 20 comprises a primary volume 20A and a secondary volume 20B connected by a plurality of segments 20C ensuring a passage of fluid between the primary volume 20A and the secondary volume 20B.
- the primary volume 20A typically defines the internal cavities for a turbine blade
- the secondary volume 20B typically defines an internal volume of a bar formed with the turbine blade during the injection of material, the bar being a material reservoir aimed at avoiding mishaps in the manner of a flyweight.
- the primary volume 20A can thus be qualified as a functional part of the core, while the secondary volume 20B corresponds to an accessory volume, which will be removed during a machining operation to produce a finished part.
- the primary volume 20A typically comprises several sub-volumes which can be separate or connected by segments having a reduced section compared to the sub-volumes concerned.
- the primary volume 20A and the secondary volume 20B have substantially equal internal volumes, typically plus or minus 15%.
- the segments 20C are commonly referred to as being the "teeth" of the core, and form part of the functional volume of the core. These segments 20C include a plurality of conduits connecting the primary volume 20A and the secondary volume 20B. These conduits each have small dimensions relative to the primary volume 20A and to the secondary volume 20B. Each of the segments 20C thus typically has a section of less than 1mm 2 .
- the secondary volume 20B is surmounted by a tertiary volume 20D in the extension of the secondary volume 20B, the limit between the secondary volume 20B and the tertiary volume 20D corresponding substantially to the upper limit of the last segment 20C (or tooth) of the core.
- the tertiary volume 20D generally corresponds to the parts of the core defining the bathtub and the dome of a blade made using the core.
- the recess 2 makes it possible to define the geometry of a core typically made of ceramic for the purpose of producing a movable wheel or a distributor of a high pressure turbine blade d 'a turbomachine by lost wax casting. It should be noted that the geometry of the recess 2 is not limiting, and that the present description can be applied to different geometries of cores.
- the body 10 of the mold 1 comprises a primary arm 30A and a secondary arm 30B, opening respectively into the primary volume 20A and into the secondary volume 20 B.
- the primary arm 30A and the secondary arm 30B are both connected to a supply cavity 40, which is connected to an injection port 50 via an injection duct 45, so to make it possible to fill the impression of the mold 1 with material.
- the primary arm 30A here fulfills a function for the supply of material to the cavity of the mold 1 and also forms a functional part. of the ceramic insert thus produced by defining a cavity in the cooling device of a blade formed with the aid of the ceramic insert.
- the secondary arm 30B which is not a functional part of the core is removed after production of the ceramic insert and before positioning of the ceramic insert in a wax injection mold, while the primary arm 30A is preserved.
- the distributor 40 is an intermediate volume, connecting the primary arm 30A and the secondary arm 30B to the injection duct 45.
- the supply cavity 40 is configured so as to distribute a suspension or a fluid which is injected via the injection duct between the primary arm 30A and the secondary arm 30B.
- the injection duct 45 is connected to the injection orifice 50, the latter being adapted to be connected to a supply source of a suspension or of a pressurized fluid.
- the primary arm 30A makes it possible to fill the primary volume 20A with material, for example a ceramic suspension.
- the secondary arm 30B makes it possible to fill the secondary volume 20B with material, for example a ceramic suspension, preventing the latter from filling the impression exclusively by passing through the teeth, and by reducing the cooling of the injected material.
- material for example a ceramic suspension
- the primary arm 30A and the secondary arm 30B typically extend in a parting plane of the mold 1.
- the injection duct 45 and the supply cavity 40 also typically extend in a parting plane of the mold 1, which makes it possible to facilitate the opening of the mold 1 after injection of material.
- the secondary arm 30B is advantageously dimensioned so as to ensure a distribution of material between the primary volume 20A and the secondary volume 20B of the cavity 20. Indeed, since the primary arm 30A is a functional part of the core, it cannot be sized freely.
- the primary volume 20A has a volume VI
- the secondary volume has a volume V2
- the primary arm 30A has a volume V3
- the secondary arm 30B has a volume V4
- these volumes are typically dimensioned so whether the ratio V1 / V2 is equal to the ratio V3 / V4, typically within 20%, or for example within 15%, or for example substantially within 15%, or for example within 10%, or for example within 5 % near.
- the volumes V3 and V4 are typically equal or substantially equal.
- the secondary arm 30B is also dimensioned so that the primary arm 30A and the secondary arm 30B have equal or substantially equal ratios between their contact surface with the body 10 of the mold 1 and their respective volumes .
- a contact surface S3 and S4 respectively which corresponds to the peripheral surface of each of the supply ducts.
- This contact surface corresponds to the surface of the body 10 of the mold 1 which will be in contact with the material injected into the primary 30A or secondary 30B arm.
- the secondary arm 30B is typically dimensioned so that the ratios S3 / V3 and S4 / V4 are equal or substantially equal, or typically equal to within 20%.
- this ratio determines in particular the heat exchanges occurring between the material injected into the mold 1 and the body 10 of the mold 1.
- maintaining an identical or similar S / V ratio allows the injected material to reach the volume primary 20A and the secondary volume 20B of the cavity 20 in substantially identical states, which improves the junctions of material within the cavity 20.
- the S / V ratio then depends only on the radius of the cylindrical section of revolution, which makes it possible to simplify the sizing of the primary arm 30A and of the secondary arm 30B.
- the primary arm 30A typically has a portion of reduced section at its junction with the primary volume 20A.
- the secondary arm 30B typically has a portion of reduced section at its junction with the secondary volume 20B.
- a test is typically carried out of the mold thus dimensioned by digital simulation, in particular in order to verify the correct balancing of the volumes of the various zones during filling of the mold before making the mold.
- Figures 2, 3 and 4 illustrate different stages of filling such a mold for the production of a ceramic foundry insert for the production of a hollow turbine blade.
- FIG. 2 shows the entry of the material into the primary volume 20A and into the secondary volume 20B of the cavity 20, which is thus filled along two separate fronts.
- Figures 3 and 4 illustrate the junction between the two material fronts M, as the filling of the cavity 20 of the mold 1.
- junction between the two fronts of material is carried out quickly after the entry of the material into the primary volume 20A and into the secondary volume 20B, typically at the segments 20C.
- the junction is thus carried out while the material has a relatively high temperature which ensures good miscibility and prevents or limits the formation of discontinuities or other defects due to rapid variations in viscosity within the material.
- the core thus produced then comprises a primary body, a secondary body and a tertiary body corresponding respectively to the primary volume 20A, to the secondary volume 20B and to the tertiary volume 20D, the primary body and the secondary body being connected by corresponding teeth to the volume of segments 20C.
- the primary arm and the secondary arm respectively define a primary branch and a secondary branch extending from the primary body and the secondary body respectively, the secondary branch extending from a distal end of the secondary body opposite to a proximal end of the body secondary from which the tertiary body extends.
- the primary branch and the secondary branch meet at the level of a tertiary branch corresponding to the volume defined by the supply cavity 40, and extending through a chimney corresponding to the volume of the injection duct 45.
- the part of the insert corresponding to the volume of the secondary arm 30B is removed, for example by machining.
- the mold structure as proposed has several advantages over a conventional mold for the production of such a core which comprises only a single feed path.
- the proposed mold makes it possible to limit the risks of unwelcome as well as the formation of segregated zones and free jets in the part, and also the risks of poor junction of material.
- the proposed mold makes it possible to limit the differential shrinkage causing deformation and rupture of the core.
- the proposed mold makes it possible to limit the residual stresses as well as the pressure observed within the injected material, which thus makes it possible to obtain a foundry core having better properties, and which is therefore less likely to break during of its use for forming a turbine engine turbine blade.
- the reduction in pressure during injection allows in particular reduce the wear of the mold 1. Likewise, reducing the shear rates makes it possible to reduce the risks of phase separation.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1906003A FR3096911B1 (fr) | 2019-06-06 | 2019-06-06 | Moule de fonderie amélioré pour la formation de noyaux céramiques d’aubes de turbine |
| PCT/FR2020/050941 WO2020245538A1 (fr) | 2019-06-06 | 2020-06-03 | Moule de fonderie amélioré pour la formation de noyaux céramiques d'aubes de turbine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3980202A1 true EP3980202A1 (fr) | 2022-04-13 |
| EP3980202B1 EP3980202B1 (fr) | 2023-07-26 |
Family
ID=68806841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20740372.6A Active EP3980202B1 (fr) | 2019-06-06 | 2020-06-03 | Moule de fonderie amélioré pour la formation de noyaux céramiques d'aubes de turbine |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US12070792B2 (fr) |
| EP (1) | EP3980202B1 (fr) |
| CN (1) | CN113993641B (fr) |
| FR (1) | FR3096911B1 (fr) |
| WO (1) | WO2020245538A1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115135430A (zh) * | 2019-11-01 | 2022-09-30 | 西门子能源全球两合公司 | 生产用于铸造陶瓷芯的柔性工装的方法 |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3160931A (en) * | 1961-01-03 | 1964-12-15 | Union Carbide Corp | Core casting method |
| GB2028928B (en) * | 1978-08-17 | 1982-08-25 | Ross Royce Ltd | Aerofoil blade for a gas turbine engine |
| JP3161290B2 (ja) * | 1995-07-06 | 2001-04-25 | 三菱自動車エンジニアリング株式会社 | 中子造型装置 |
| US6331267B1 (en) * | 1999-11-16 | 2001-12-18 | General Electric Company | Apparatus and method for molding a core for use in casting hollow parts |
| RU2252105C2 (ru) * | 2003-06-16 | 2005-05-20 | Траченко Андрей Иванович | Металлическая опорная часть композиционной керамической формы, композиционная керамическая форма (варианты), способ изготовления композиционной керамической формы (варианты) и устройство для его осуществления (варианты) |
| FR2900850B1 (fr) * | 2006-05-10 | 2009-02-06 | Snecma Sa | Procede de fabrication de noyaux ceramiques de fonderie pour aubes de turbomachine |
| US20110132562A1 (en) * | 2009-12-08 | 2011-06-09 | Merrill Gary B | Waxless precision casting process |
| CN102397986A (zh) * | 2011-11-01 | 2012-04-04 | 昆明理工大学 | 一种利用陶瓷模型制备金属磨球模具的方法 |
| CN103990761B (zh) * | 2014-05-29 | 2016-01-20 | 西安交通大学 | 一种带有冲击孔结构的空心涡轮叶片制造方法 |
| FR3022811B1 (fr) * | 2014-06-30 | 2016-10-14 | Snecma | Procede de fabrication d'un assemblage de noyaux pour la fabrication d'une aube |
| FR3037830B1 (fr) * | 2015-06-29 | 2024-02-16 | Snecma | Ensemble de moulage d'une aube de turbomachine, comprenant une portion en relief de grande section |
| CN105312499A (zh) * | 2015-10-23 | 2016-02-10 | 沈阳黎明航空发动机(集团)有限责任公司 | 一种陶瓷型芯浆料充型能力测试装置及其使用方法 |
-
2019
- 2019-06-06 FR FR1906003A patent/FR3096911B1/fr active Active
-
2020
- 2020-06-03 WO PCT/FR2020/050941 patent/WO2020245538A1/fr not_active Ceased
- 2020-06-03 EP EP20740372.6A patent/EP3980202B1/fr active Active
- 2020-06-03 US US17/596,167 patent/US12070792B2/en active Active
- 2020-06-03 CN CN202080044082.3A patent/CN113993641B/zh active Active
Also Published As
| Publication number | Publication date |
|---|---|
| US20220219226A1 (en) | 2022-07-14 |
| FR3096911A1 (fr) | 2020-12-11 |
| CN113993641B (zh) | 2023-07-18 |
| CN113993641A (zh) | 2022-01-28 |
| WO2020245538A1 (fr) | 2020-12-10 |
| FR3096911B1 (fr) | 2021-05-14 |
| EP3980202B1 (fr) | 2023-07-26 |
| US12070792B2 (en) | 2024-08-27 |
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