EP3496880A1 - Procede de positionnement d'un noyau dans un moule - Google Patents
Procede de positionnement d'un noyau dans un mouleInfo
- Publication number
- EP3496880A1 EP3496880A1 EP17754768.4A EP17754768A EP3496880A1 EP 3496880 A1 EP3496880 A1 EP 3496880A1 EP 17754768 A EP17754768 A EP 17754768A EP 3496880 A1 EP3496880 A1 EP 3496880A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- model
- core
- spatial
- dimensional
- theoretical
- 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
- 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
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/108—Installation of cores
Definitions
- the present invention relates to a method for determining the position of a core in an injection mold, in particular a wax injection mold. This method is intended for the manufacture of parts for turbomachines, such as turbine blades.
- the lost-wax foundry technique consists first and foremost in producing a wax model, or any other easily removable material, of the part to be produced; this model comprises an internal part forming a ceramic core which shows the cavities that it is desired to appear inside the vane.
- the wax model is then soaked several times in slips consisting of a suspension of ceramic particles for making, by so-called stuccoing and drying operations, a shell mold.
- the carapace mold is then dewaxed, which is an operation by which the wax or the material constituting the original model is removed from the shell. After this elimination, a ceramic mold is obtained, the cavity of which reproduces all the shapes of the blade and which still contains the ceramic core intended to generate the internal cavities thereof. The mold then undergoes heat treatment at high temperature or "cooking" which gives it the necessary mechanical properties.
- the shell mold is then ready for the manufacture of the metal part by casting.
- the next step is to cast a molten metal, which occupies the voids between the inner wall of the shell mold and the core, and to solidify it.
- a molten metal which occupies the voids between the inner wall of the shell mold and the core.
- It may be directed solidification with columnar structure (DS), directed solidification with monocrystalline structure (SX) or equiaxed solidification (EX).
- DS directed solidification with columnar structure
- SX directed solidification with monocrystalline structure
- EX equiaxed solidification
- a tool or wax injection mold, in which the core is placed and then the liquid wax is injected by a channel provided for this purpose.
- the molds currently used comprise means of support of the core statically, these support means may comprise rods whose ends form points of support to support the core in the mold.
- the invention aims in particular to provide a simple, effective and economical solution to the problems of the prior art described above.
- a defect in the geometry of the cores is compensated by a repositioning of a representative core with respect to the faces functional of the theoretical model. All the cores are then positioned in an injection mold in the same way as the representative core is positioned in a mold.
- the method is thus particularly interesting when the (or) lack of geometry of the cores corresponds to a drift of one dimension compared to a nominal value.
- the kernels are collected randomly.
- a functional face of the core designates a face of the core intended to form, before assembly of the part, a face of the final geometry of the part.
- a functional face is an outer face of the core which allows the shaping of the inner or outer faces of the metal part and which has an impact on the aerodynamics and the thermal of the workpiece in operation.
- a functional face may refer to an outer face of the core forming an inner face of a wall of the core, such as an intrados or extrados wall for example.
- the internal cavity of the blade may be a cooling cavity of the blade.
- three-dimensional model with reference to a core is interpreted as a set of numerical data allowing a three-dimensional numerical reconstruction of the core, for example by a geometric mesh.
- spatial refers to a three-dimensional model positioned in space.
- the term "flunked” refers to a spatial three-dimensional model that has been positioned or repositioned in space.
- each three-dimensional model can be obtained from a three-dimensional survey of the outer surface of the core, for example obtained from a non-contact measurement which can be carried out by optical triangulation.
- a central projector illuminates a room with a network of fringes that are observed by two CCD cameras.
- step d) may comprise the following steps:
- the determination of the representative core is thus performed by measuring the deviations on a functional face after registration on the support points. It is indeed interesting to measure the deviations from at least one functional face since it is a face having a direct impact on a corresponding face of the final part.
- step d) may comprise the following steps, for each kernel R t :
- the method comprises a verification step, interposed between steps e) and f), consisting in verifying that the recalibrated spatial model V2 of the core R rep is better positioned than the recalibrated spatial model V1 of the core R rep .
- the verification step includes the following steps:
- the gap E3 ⁇ 4 and / or the gap E? ep j can be determined according to the normal to the theoretical spatial three-dimensional model at point P j .
- the repositioning of the support points of step f) can be performed in the following manner, for each of the support points T q :
- k is greater than or equal to five and / or / is greater than or equal to six and / or n is greater than or equal to three.
- n is a function of the curvature and the tolerance of the functional face considered. The lower the curvature, the less n is large. Thus, the minimum number n is three, which corresponds to the minimum number of points for positioning a plane isostatically in space.
- the injection mold is a wax injection mold.
- the core may be a turbine blade core for example.
- k kernels denoted R ... R t ... R k are selected in a population of nuclei, all made from the same theoretical three-dimensional model of nucleus.
- population here refers to a set of nuclei whose number can be determined or indeterminate.
- a three-dimensional survey of the outer surface of each of the cores is obtained from a non-contact measurement which may be an optical measurement, for example by optical triangulation as mentioned above.
- a non-contact measurement which may be an optical measurement, for example by optical triangulation as mentioned above.
- another method may be to use a more accurate, but much slower, feeler device or coordinate measuring machine (CMM).
- CCM coordinate measuring machine
- the three-dimensional survey makes it possible to establish a three-dimensional model of each of the nuclei, that is to say a numerical model comprising a set of coordinates of points of the surface of a nucleus, allowing a relative positioning of the points.
- the method comprises a step of positioning in the space of each of the three-dimensional models with respect to / points of support T ... T q ... T l of the core in the mold so as to obtain a spatial three-dimensional model V 1 for each nucleus.
- This positioning thus consists of a spatial registration with respect to the points of support.
- this registration can be achieved by minimizing the difference between the theoretical spatial three-dimensional model and the recalibrated spatial three-dimensional model V1 of each of the nuclei at the points T q . Minimization can be done using the least squares method.
- the method then consists, in a fourth step, in selecting the core denoted R rep whose spatial recalibrated spatial three-dimensional model V1 has the least difference with the average deviations calculated between the real models and the theoretical spatial three-dimensional model.
- This step is performed on n points P j noted P 1 ... P j ... P n belonging to at least one of the functional faces of the theoretical model of the theoretical core.
- the n points are distributed over a maximum number of functional faces.
- the n points are distributed over the functional faces chosen and a number of points per face is selected as a function of the curvature and the tolerance applied to the face considered.
- This step of selecting the nucleus representative of the group of k nuclei is performed by carrying out the following steps:
- the registration of the representative core R rep is performed only on at least one of the functional faces and does not take into account the points of support T q . It is a question here of allowing a repositioning of the representative core R rep so as to minimize the differences of form between the part obtained from the representative core and a theoretical piece resulting from the theoretical core, the stress of the bearing points T q being eliminated.
- a preliminary step of verifying the registration of the three-dimensional spatial recalibrated model V2 of the core R rep is performed.
- This verification step includes the following steps:
- the functional faces In a complementary approach, it would be possible to classify the functional faces into at least two groups, a first group of main functional faces and a second group of secondary functional faces.
- the main functional faces are faces for which manufacturing tolerances are lower than for the secondary functional faces so that the registration performed in step e) can be performed preferentially on the main functional faces.
- the resetting of step e) is to be performed again, it is then preferable to remove the resetting constraint with respect to a secondary functional face.
- the sixth step f) consists in repositioning the support points T q so as to be able to support the core R rep in the position corresponding to the three-dimensional spatial recalibrated model V2 of the core R rep .
- This repositioning is performed by performing the steps of:
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1657663A FR3054970B1 (fr) | 2016-08-09 | 2016-08-09 | Procede de positionnement d'un noyau dans un moule |
| PCT/FR2017/052185 WO2018029422A1 (fr) | 2016-08-09 | 2017-08-03 | Procede de positionnement d'un noyau dans un moule |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3496880A1 true EP3496880A1 (fr) | 2019-06-19 |
| EP3496880B1 EP3496880B1 (fr) | 2022-03-02 |
Family
ID=57045194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP17754768.4A Active EP3496880B1 (fr) | 2016-08-09 | 2017-08-03 | Procede de positionnement d'un noyau dans un moule |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US10576536B2 (fr) |
| EP (1) | EP3496880B1 (fr) |
| FR (1) | FR3054970B1 (fr) |
| WO (1) | WO2018029422A1 (fr) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3114988B1 (fr) * | 2020-10-08 | 2023-10-13 | Safran | Procédé de détermination d’une position d’un insert dans un modèle en cire |
| FR3114984A1 (fr) * | 2020-10-08 | 2022-04-15 | Safran | Procédé d’ajustement d’une position de moyens de blocage d’un moule à injection de cire. |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2874186B1 (fr) | 2004-08-12 | 2008-01-25 | Snecma Moteurs Sa | Procede de fabrication par moulage a cire perdue de pieces comportant au moins une cavite. |
| FR2875425B1 (fr) | 2004-09-21 | 2007-03-30 | Snecma Moteurs Sa | Procede de fabrication d'une aube de turbomachine, assemblage de noyaux pour la mise en oeuvre du procede. |
| JP4887919B2 (ja) * | 2006-06-13 | 2012-02-29 | 横浜ゴム株式会社 | タイヤ型部材検査方法、タイヤ型部材検査装置、および型部材作製工程精度検査方法 |
| DE102007050316A1 (de) * | 2007-10-18 | 2009-04-23 | Steffen Hachtel | Verfahren zur Korrektur einer Spritzgießform |
| WO2013135236A1 (fr) * | 2012-03-12 | 2013-09-19 | Actech Gmbh | Procédé servant à positionner et à fixer des pièces moulées dans des moules de coulée |
-
2016
- 2016-08-09 FR FR1657663A patent/FR3054970B1/fr not_active Expired - Fee Related
-
2017
- 2017-08-03 US US16/324,283 patent/US10576536B2/en active Active
- 2017-08-03 WO PCT/FR2017/052185 patent/WO2018029422A1/fr not_active Ceased
- 2017-08-03 EP EP17754768.4A patent/EP3496880B1/fr active Active
Also Published As
| Publication number | Publication date |
|---|---|
| US20200038941A2 (en) | 2020-02-06 |
| US10576536B2 (en) | 2020-03-03 |
| FR3054970A1 (fr) | 2018-02-16 |
| US20190168292A1 (en) | 2019-06-06 |
| FR3054970B1 (fr) | 2018-07-27 |
| EP3496880B1 (fr) | 2022-03-02 |
| WO2018029422A1 (fr) | 2018-02-15 |
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