EP4308322A1 - Procédé de fabrication par moulage de cire perdue - Google Patents
Procédé de fabrication par moulage de cire perdueInfo
- Publication number
- EP4308322A1 EP4308322A1 EP22713704.9A EP22713704A EP4308322A1 EP 4308322 A1 EP4308322 A1 EP 4308322A1 EP 22713704 A EP22713704 A EP 22713704A EP 4308322 A1 EP4308322 A1 EP 4308322A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wax
- core elements
- clip
- staple
- core
- 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
- B22C7/02—Lost patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C21/00—Flasks; Accessories therefor
- B22C21/12—Accessories
- B22C21/14—Accessories for reinforcing or securing moulding materials or cores, e.g. gaggers, chaplets, pins, bars
-
- 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
- B22C9/103—Multipart 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D25/00—Special casting characterised by the nature of the product
- B22D25/02—Special casting characterised by the nature of the product by its peculiarity of shape; of works of art
Definitions
- TITLE Manufacturing process by lost wax casting
- This presentation relates to the field of turbines, in particular that of turbine engine turbines, and is aimed at a method of manufacturing parts, in particular blades, by lost-wax casting, said parts comprising cavities intended for the circulation of cooling fluids.
- Turbine blades are subjected to high thermal stresses and include means for cooling by circulation of a heat transfer fluid, generally air in the case of a gas turbine engine, inside cavities provided in dawn.
- a heat transfer fluid generally air in the case of a gas turbine engine
- Turbine blades are generally made by casting, in particular by lost-wax casting.
- This technique consists of making a wax model of the part to be manufactured.
- the wax model is wrapped in a ceramic shell mold. This is made by successive dipping of the wax model in slips containing a ceramic material and by stuccoing the layer formed between each dipping.
- the wax model is eliminated during a first firing at a suitable temperature.
- the shell mold is then fired at a high temperature to give it the strength necessary for casting the metal.
- the shell mold then comprises a cavity forming the image of the hollow model, molten metal being poured into said cavity. After cooling, the shell mold is broken to release the part. It then undergoes a finishing treatment.
- This phase of the process firstly comprises the separate manufacture of the core element(s) by molding a ceramic material consolidated by a binder, their assembly if necessary, and the placement of the core element(s) in a mold to wax.
- a wax model is thus produced by injecting wax into the wax mould. This model is a replica of the piece to be obtained.
- FIG. 1 represents, in section perpendicular to the axis of the part, a wax mold 10 whose internal wall is the image of the part to be obtained.
- This wax mold is here in two parts 10A and 10B.
- a core 13 composed of a plurality of branches 13A to 13G parallel to each other is placed in the mold 10. The branches define between them spaces which will form partitions after the casting of the metal.
- platinum pins 20 are placed between the core 13G and the wall 17 of the mould, the pins 20 providing the spacer function.
- a ceramic shell mold is then obtained after the extraction of the wax model. Molten metal is then poured into the space between the walls of the ceramic mold and those of the core. The pins are then melted and dissolved in the metal. The ceramic core is then eliminated by appropriate treatment.
- the function of the pins is to maintain a space between the walls of the core and the inner wall of the mold, especially when injecting wax into the wax mold. This makes it possible to guarantee compliance with the dimensions of the wax model, and therefore of the ceramic shell mold and of the metal part to be manufactured.
- the purpose of this presentation is to propose a process for manufacturing a part with cavities by wax casting while ensuring precise thicknesses of the walls of the part, reliably and inexpensively.
- this presentation proposes a method for producing a wax model for the manufacture of a part, such as a turbine blade, said part comprising at least one cavity, the method comprising the steps consisting of: arranging at least two core elements made of ceramic material in a wax mould, said core elements having at least in part a shape complementary to the cavity of the part to be manufactured, and injecting wax into the wax mould, around the core elements, so as to form the wax model, in which the two core elements are assembled prior to the injection of wax by at least one staple, said staple comprising a central part from which extend two branches , each branch being engaged in an orifice formed in one of the core elements.
- the clip makes it possible to maintain the core elements in position relative to each other and/or relative to the internal surface of the wax mold, in particular during the injection of wax into the mold. wax.
- the wax model obtained thus forms a replica whose dimensions are controlled, so that the part manufactured on the basis of this model meets dimensional specifications.
- One to two staples can make it possible to hold two core elements in place relative to each other, which makes it possible to reduce the cost of the manufacturing process.
- the clip once the clip is in position, for example after gluing, it will remain in place throughout the entire process without the risk of losing it or moving it slightly, which would cause poor positioning.
- the staple makes it possible to guarantee the wall thickness around the core.
- the core elements may partially have a shape complementary to the cavity and their assembly may fully have the shape complementary to the cavity.
- the staple can have a general U, C, V or M shape.
- the part to be manufactured may comprise at least two cavities each formed by a core, the shape of which may be dependent on the shape of the cavity to be produced.
- the method may comprise, prior to the assembly of the two core elements by the staple, a step consisting in positioning at least one spacer between the two core elements to maintain said core elements at a predetermined distance from one of the other. Said spacer can be removed after fixing the clip.
- the two core elements can be assembled directly by the clip without using the spacer.
- At least one, in particular each, of the branches of the clip can be maintained in the orifice by gluing.
- the bonding of one of the branches of the clip can be achieved by an adhesive, for example of the Loctite® type, wax or any other appropriate means to hold said branch in the corresponding orifice.
- At least one, in particular each, orifice of one of the core elements may be a blind orifice. This makes it possible to limit the length of the branches of the staple.
- At least one, in particular each, orifice of one of the core elements may be a through orifice, the corresponding branch of the clip passing through said orifice and the free end of said branch being folded over the corresponding core so as to block the clip in position. This makes it possible to maintain the relative position of the core elements more reliably.
- the central part and the two branches of the clip can have a circular section.
- At least one, in particular each, orifice of one of the core elements may have a diameter of between 0.5 mm and 1 mm, in particular equal to 0.8 mm.
- the clip may have a diameter substantially identical to the diameter of the corresponding orifice or orifices, with an assembly clearance which is for example of the order of 0.1 mm.
- the clip can be made of platinum or another material, depending on the metal material intended for casting.
- the cores may have first side surfaces turned on the same side. Said staple can be placed so that the central leg is against said first side faces of the cores.
- Staple branches can extend in the same direction crossing the nuclei.
- the distal portions of the legs of the staple can be folded over second side surfaces of the cores opposite the first side surfaces.
- the branches of the staple can be folded over said side surfaces in two opposite directions.
- This presentation also relates to a process for manufacturing a part, such as a turbine blade, comprising at least one cavity comprising the steps consisting of:
- the shell mold can be manufactured by successive dipping of the wax model in slips containing a ceramic material and by stuccoing the layer formed between each dipping.
- the wax model can be removed from the shell mold by firing at a suitable temperature.
- the shell mold can be fired at an elevated temperature after removal of the wax pattern.
- the shell mold can be eliminated after the casting of the metallic material by an appropriate mechanical and/or chemical treatment.
- the part can be a moving vane or a turbine stator vane.
- FIG. 1 figure 1, already described, represents a schematic view of a wax mold for making a wax model
- FIG. 2 Figures 2a and 2b are schematic perspective views of two core elements provided to each form a corresponding cavity in a blade to be manufactured.
- FIG. 3 figure 3 shows a first assembly step of the core elements of figure 2.
- figure 4 shows a second assembly step of the core elements of figure 2.
- FIG. 5 shows a schematic perspective view of a clip connecting the core elements of Figure 2.
- Figure 6 shows a schematic sectional view of a clip connecting the core elements of Figure 2.
- a wax model for manufacturing a blade is obtained by injecting wax into the wax mold 10.
- core elements 102 and 104 Prior to the injection of wax, core elements 102 and 104 are placed in the mold to wax 10 instead of the core elements 13.
- the core elements 102 and 104 are made of a ceramic material.
- An outer face 106 of core 102 defines the leading edge of the blade to be produced.
- Part 108 of core 104 defines the trailing edge of the blade to be produced.
- Figures 3 and 4 show assembly steps of the core elements 102 and 104 before positioning them in the wax mold 10.
- the core elements 102 and 104 are first positioned relative to each other using an axial or longitudinal stop 110 and two first spacers 112.
- the stop 110 makes it possible to align the elements of cores 102 and 104 in an axial or longitudinal direction.
- the first spacers 112 make it possible to maintain a distance between the core 102 and the core 104 in a direction perpendicular to the longitudinal direction. This distance between the core elements 102 and 104 makes it possible to form a wall between two cavities in the blade, after production of the wax model and casting of a molten metallic material in a shell mold made from the wax model.
- one or more staples 114 are configured to hold the core elements 102 and 104 relative to each other.
- Each clip 114 comprises a central part 116, two branches 118 extending perpendicular to the central part 116, from each of the ends of said central part 116.
- the branches 118 of the clips 114 are engaged in orifices 120 of the core 102 and in orifices 122 of core 104.
- the clip 114 can be held in the orifices 120 and 122 by a bonding step, for example by means of an appropriate glue or wax.
- the clip is made of platinum or any other material suitable to be melted during the casting of the metallic material.
- the spacers 112 are removed and the core elements 102 and 104 are positioned in the wax mold 10.
- the core elements 102 and 104 are positioned relative to each other without the use of the spacers 112.
- the core elements 102 and 104 held together are directly disposed in the wax mold 10.
- the orifices 120 or 122 can be blind orifices.
- the orifices 120 or 122 can be through orifices as represented in FIG. 6.
- the ends of the branches 118 can be folded over a surface 103 of the core 102, respectively a surface 105 of the core central 116. In this way, the gluing of the clip 114 is no longer necessary to hold the clip 114 in position.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2102604A FR3120807B1 (fr) | 2021-03-16 | 2021-03-16 | Procédé de fabrication par moulage de cire perdue |
| PCT/FR2022/050416 WO2022195196A1 (fr) | 2021-03-16 | 2022-03-08 | Procédé de fabrication par moulage de cire perdue |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4308322A1 true EP4308322A1 (fr) | 2024-01-24 |
| EP4308322B1 EP4308322B1 (fr) | 2025-02-12 |
Family
ID=76730652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22713704.9A Active EP4308322B1 (fr) | 2021-03-16 | 2022-03-08 | Procédé de fabrication par moulage de cire perdue |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US12042847B2 (fr) |
| EP (1) | EP4308322B1 (fr) |
| CN (1) | CN117083136A (fr) |
| FR (1) | FR3120807B1 (fr) |
| WO (1) | WO2022195196A1 (fr) |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0619170B2 (ja) * | 1986-01-22 | 1994-03-16 | 株式会社ニフコ | 板の留め具 |
| US5853044A (en) * | 1996-04-24 | 1998-12-29 | Pcc Airfoils, Inc. | Method of casting an article |
| JP4327351B2 (ja) * | 1998-01-23 | 2009-09-09 | シーメンス アクチエンゲゼルシヤフト | 鋳造品、鋳造品の製造方法ならびに鋳型 |
| DE10245956A1 (de) * | 2002-10-02 | 2004-04-15 | Eisenwerk Brühl GmbH | Formkernanordnung zur Herstellung eines Zylinderkurbelgehäuses mit getrenntem Wasserkühlungsbereich |
| CN2783045Y (zh) * | 2005-05-08 | 2006-05-24 | 王永堂 | 钢丝绳传动带连接头 |
| FR2889088B1 (fr) | 2005-07-29 | 2008-08-22 | Snecma | Noyau pour aubes de turbomachine |
| US20110204205A1 (en) * | 2010-02-25 | 2011-08-25 | Ahmed Kamel | Casting core for turbine engine components and method of making the same |
| FR2998210B1 (fr) * | 2012-11-20 | 2017-03-10 | Plastic Omnium Cie | Ensemble d'un insert metallique et d'une nappe de materiau composite, procede d'incorporation d'un tel insert dans une telle nappe et piece obtenue par moulage d'une telle nappe |
| EP3036055B1 (fr) | 2013-08-23 | 2019-07-03 | Siemens Energy, Inc. | Noyau de coulée de composant de turbine doté d'une région haute résolution |
| ES1136430Y (es) * | 2015-01-28 | 2015-05-11 | Fama Sofas S L | Dispositivo para la union de partes de elementos de mobiliario |
| FR3054460B1 (fr) * | 2016-07-27 | 2021-05-28 | Safran | Procede de realisation d'un modele non permanent |
| US10155265B2 (en) * | 2016-12-28 | 2018-12-18 | Mapna Group Co. | Method for positioning core by soluble wax in investment casting |
| CN106939651A (zh) * | 2017-03-22 | 2017-07-11 | 河南天丰节能板材科技股份有限公司 | 一种保温板材以及使用该保温板材的组合板 |
| CN207399069U (zh) * | 2017-10-18 | 2018-05-22 | 天津威全新能源科技有限公司 | 一种横梁连接件 |
| FR3100143B1 (fr) * | 2019-08-30 | 2021-11-12 | Safran | Procédé amélioré de fabrication d’un noyau céramique pour la fabrication d’aubes de turbomachine |
-
2021
- 2021-03-16 FR FR2102604A patent/FR3120807B1/fr active Active
-
2022
- 2022-03-08 CN CN202280021105.8A patent/CN117083136A/zh active Pending
- 2022-03-08 EP EP22713704.9A patent/EP4308322B1/fr active Active
- 2022-03-08 US US18/550,230 patent/US12042847B2/en active Active
- 2022-03-08 WO PCT/FR2022/050416 patent/WO2022195196A1/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| US20240157433A1 (en) | 2024-05-16 |
| FR3120807A1 (fr) | 2022-09-23 |
| FR3120807B1 (fr) | 2023-12-01 |
| WO2022195196A1 (fr) | 2022-09-22 |
| EP4308322B1 (fr) | 2025-02-12 |
| CN117083136A (zh) | 2023-11-17 |
| US12042847B2 (en) | 2024-07-23 |
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