EP3099438B1 - Lined mould for centrifugal casting - Google Patents
Lined mould for centrifugal casting Download PDFInfo
- Publication number
- EP3099438B1 EP3099438B1 EP15708562.2A EP15708562A EP3099438B1 EP 3099438 B1 EP3099438 B1 EP 3099438B1 EP 15708562 A EP15708562 A EP 15708562A EP 3099438 B1 EP3099438 B1 EP 3099438B1
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- EP
- European Patent Office
- Prior art keywords
- exoskeleton
- liner
- mold
- mold according
- alloy
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- 238000009750 centrifugal casting Methods 0.000 title claims description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 20
- 239000000956 alloy Substances 0.000 claims description 20
- 238000005266 casting Methods 0.000 claims description 16
- 210000003850 cellular structure Anatomy 0.000 claims description 7
- 229910001092 metal group alloy Inorganic materials 0.000 claims description 7
- 229910010038 TiAl Inorganic materials 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000005119 centrifugation Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 230000008646 thermal stress Effects 0.000 description 4
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 230000004584 weight gain Effects 0.000 description 1
- 235000019786 weight gain Nutrition 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
- B22D13/10—Accessories for centrifugal casting apparatus, e.g. moulds, linings therefor, means for feeding molten metal, cleansing moulds, removing castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
- B22D13/10—Accessories for centrifugal casting apparatus, e.g. moulds, linings therefor, means for feeding molten metal, cleansing moulds, removing castings
- B22D13/101—Moulds
- B22D13/102—Linings for moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
- B22D13/10—Accessories for centrifugal casting apparatus, e.g. moulds, linings therefor, means for feeding molten metal, cleansing moulds, removing castings
- B22D13/101—Moulds
Definitions
- the present invention relates to a mold for manufacturing by centrifugal casting of metal parts, in particular turbomachine blades. More specifically, the turbine wheel vanes of a turbojet or an airplane turbo-prop.
- turbomachine blades by machining a blank obtained by casting by casting of a metal alloy.
- the blank is typically a rod of generally elongated solid shape and is machined in the mass to achieve the final geometry of the blades.
- a (first) problem to be solved concerns the control of the cooling rate to promote the production of a controlled microstructure, such as a level of homogeneous aluminum in the part, especially if the alloy is based on TiAl.
- the present invention overcomes at least some of the aforementioned drawbacks simply, efficiently and economically.
- the shirts can be changed at a lower cost, while the rest of the mold structure, particularly the exoskeleton (s), can be preserved.
- the exoskeleton (s) and the shirts be designed so that the mold is permanent, the shirts thus having to hold several castings in succession (for example approximately 25).
- the mold jackets be made of steel, metal alloy and / or ceramic, and are therefore suitable for spinning centrifugally molten TiAl alloy .
- At least one thermally insulating structure extends peripherally between each liner and the surrounding exoskeleton.
- each exoskeleton may have a very simple shape, not or little worked for this desired control of thermal inertia, and all the more so if said thermally insulating structure is alveolar.
- thermal inertia if said thermally insulating structure is alveolar.
- such a solution by its structure in boxes, typically will promote the resistance to mechanical forces, and in particular the retention of shirts during centrifugation.
- the structure in question defines at least part of said centering means which therefore position the shirt in relation to the exoskeleton.
- the modular nature of the molds will be favored, so that the jacket, the honeycomb and / or thermally insulating structure surrounding it and the exoskeleton surrounding said structure are three separable elements between them, the jacket and the thermally insulating structure being engaged in the exoskeleton, concentrically.
- individually the jackets having an inner surface which delimits the / a central casting duct of the alloy, a radially outer end portion of this conduit is supported.
- Figure 1 we see a rod 11 made of metal foundry and in which are intended to be machined at least one blade, here two blades, 12 turbine of a turbomachine.
- the bar 11 may have a cylindrical shape and is full. It is obtained by casting a metal alloy in a mold.
- the figure 2 represents a conventional device for producing bars or blanks 11, by successive operations of casting, casting and molding.
- the device 10 comprises a closed and sealed enclosure 120 in which a partial vacuum is applied.
- An ingot 16 of metal alloy in this case containing aluminum, and more precisely in the TiAl-based example, is first melted in a crucible 14. In fusion, it is poured into a metal mold 13 permanent.
- the mold 13 is used to cast the alloy by centrifugation, in order to obtain bars 11. For this, it is rotated about a vertical axis A.
- the mold 13 comprises a plurality of housings 17, for example cylindrical of circular section, which extend radially (axes B1, B2; figures 2,3 ) around the axis A, preferably via a motor 18. These cavities are preferably regularly spaced angularly about the axis A which is vertical here.
- the centrifugal forces generated by the rotation of the mold force the molten alloy into these dwellings and fill them.
- the casting alloy brought to the center of the mold, is distributed to the cavities.
- the mold 13 is disassembled and the molded bars 11 are extracted.
- the walls of the mold surrounding the recess 17 of the metal have significant thicknesses to withstand centrifugal forces, typically more than 10 g.
- the invention makes it possible to provide a solution to the cited problem of segregations and, if necessary, to meet the requirements of resistance to centrifugal forces and rapid and frequent change of at least part of the mold.
- FIGS. 4 to 15 represent embodiments of a mold 130 according to the invention, it being specified that the figures 5 and following schematize variants of shirts and exoskeletons likely to replace those shown figure 4 around the central block 131.
- the figures 5 and following schematize variants of shirts and exoskeletons likely to replace those shown figure 4 around the central block 131.
- they have not been illustrated or systematically taken up in all the variants described below, so as not to overload the figures or to render tedious the following. Nevertheless, the particularities of these embodiments can be combined and applied from one mode to another.
- the mold 130 differs from the mold 13 in the realization of some of its structural means, in particular its radial receiving housing of the alloy.
- the bent inner ducts 132 from which the alloy is caused to be distributed radially around the central vertical axis A, are regularly spaced shirts 135 (or for example 135a, 135b figure 4 ) which together define the aforementioned dwellings.
- the ducts 132 open respectively into radial ducts 133 which receive the alloy through an opening 133a and each extend inside one of the jackets, in a radial direction B.
- the opening 133a of each jacket is thus located in the radially inner end portion 134a of the duct concerned.
- the shirts which are thus hollow, are arranged in at least one exoskeleton 137, and preferably in as many exoskeletons as there are shirts, each exoskeleton then containing a jacket 135 defining one of said housings.
- the exoskeleton (s) retain the jackets with respect to the centrifugal forces generated by the rotation of the mold. Preferably, they will promote (or at least do not hinder) a limitation of the thermal inertia.
- the central axis A of rotation of the mold is vertical and both the shirts 135 and the exoskeletons 137 each extend along a horizontal longitudinal axis (axis B).
- each duct 133 has a solid bottom 135c.
- each exoskeleton 137 has, at its radially inner end, an opening 137a through which, for example, a liner 135 can pass and, at its radially outer end, a bottom 137b which can participate in the radial retention of the liner. .
- Removable fasteners such as 141a, 141b, are provided between each jacket (and / or the surrounding exoskeleton, references 142a, 142b) and the central block 131.
- the removable fasteners established between shirts and exoskeleton (s) and / or between the central block 131 and shirts and / or exoskeleton (s) may form thermal break zones.
- the exoskeleton (s) is / are made of mild steel, steels or alloys that are more or less refractory and the sheaths are made of mild steel, steels or alloys that are more or less refractory and / or ceramic.
- peripheral wall is referenced 135d and there is seen in the center, the molded bar (blank) 110 from the casting.
- the figure 8 illustrates a solution where the schematized exoskeleton 137a is provided with a movable door 143a which, in the open position, releases an opening 145 for passing through it (here laterally with respect to the radial axis B) the shirt considered here 135a.
- Hinges such as that identified 147a, may facilitate the operation of each mobile door and thus for example the extraction from its exoskeleton of a used sleeve and the introduction of another, in better condition, replacing.
- a void space 155 exists peripherally (around the axis B) between each jacket, such as 135a, and the exoskeleton, such as 137a, which surrounds it.
- Centering means 157 position, in a fixed manner during the centrifugation, the sleeve considered with respect to the exoskeleton, for casting (see FIG. figure 5 ).
- FIGS 9,10 illustrate yet another solution where the shirts are individually formed of several shells, such as 150a, 150b for the shirt 135a schematically.
- the respective inner surfaces of the shells define at least the major part of the cast bar 110.
- these shells open and close along a joint surface of the shells, such as the joint plane 152.
- one of these shells can constitute a movable or removable door vis-à-vis the other, to unmold the piece.
- a separable attachment 153 such as a latch, is established between the shells for, once the shells are separated, to be able to pull the bar 110 from the inside of the liner, here 135a, considered, through the opening 154 released.
- a honeycomb structure 159 which extends peripherally between each liner, such as 135a, and the surrounding exoskeleton, such as 137a, plays this role and therefore defines at least a part of said centering means 157 above.
- the honeycomb structure 159 may be annular. It can occupy a space between the bottom 135c of the shirts and that 137b of the exoskeleton considered ( Figure12 ).
- the figure 13 shows that the considered liner and the honeycomb structure, such as 159, are in contact by discrete zones, such as 159a, 159b,
- each jacket such as 135a
- said structure 159 which surrounds it
- the exoskeleton such as 137a
- this structure in three distinct elements, dissociable between them, the jacket and the structure being engaged in the exoskeleton, concentrically, thus following a radial B to the axis A.
- the transverse surface 165 will preferably be an internal shoulder of the exoskeleton.
- the radially outer end 134b can be opened, the exoskeleton then resembling a structure traversed from one side to the other by at least one passage, where the / each relevant sleeve is received.
- An attached plug 167 (which may be removable) will then plug this radially outer end 134b, in the manner of the aforementioned bottom 135a.
- the / each plug 167 will not penetrate the exoskeleton beyond the transverse surface 165.
- the shirt will not come to bear against it, which is preferable during centrifugation.
- the outer structure, in particular that in exoskeleton (s), of the mold may be cylindrical tubular (structure). It will favorably be made of mild steel. Y will thus be slipped axially an insert (the aforementioned folder) of metallic material or ceramic more or less refractory, which may include shells (such as two half-shells) as mentioned above.
- a slope of a minimum degree will preferably be provided between the structure and the insert. This will allow the shirt to come in / out along the exoskeleton, along the B axis, while concentrating them coaxially, in contact with each other.
- a detachable fastener will be made (by tightening) between the jacket and the surrounding exoskeleton.
- the interior volume of the shirts 135 can be of simple geometry (cylinder, rectangle, cone or combination) or complex. In general, any demoldable shape according to the closure plane of the half-shells is a priori acceptable.
- the shirts each have at least one thickness which varies along said radial direction (length L) and which is, at least globally, smaller towards at least one of the radially inner and outer ends, 134a, 134b, than in the intermediate portion, as shown Figures 14 ,; see also thicknesses e1, e2 and e3.
- the figure14 show the interest in having a mold where, individually, the radially open inner end 133a of the central duct 133 for casting the alloy of all or part of the shirts 135 would have a shape 169 thus narrowing in section towards the center of the jacket, along the radial direction, B, according to which the corresponding jacket extends.
- the form 169 can thus be single or double funnel (head to tail).
- a truncated cone might be suitable.
- this funnel / chute shape will not necessarily have a symmetry of revolution.
- the funnel / chute shape may correspond to the heel area of this blade and the end portion 133b enlarged to the zone of the blade. extended foot.
- individually all or part of the shirts 135 may have, transversely to the radial direction B along which they extend, a radial peripheral surface 170 at least locally (or partially) machined, as schematized figure 15 .
- longitudinal reinforcements 171 may be provided to ensure the rigidity, centering and / or guiding of the liner 135 concerned in the peripheral structure 137.
- the reinforcements are radially protruding relative to the rest of the concerned shirt.
- a positioning of the reinforcements 171 towards the radial ends 134a, 134b will make it possible to disengage the intermediate zones along the length of the mold, where the presence of at least one (empty) space 155 is favorable to the control of constraints, including thermal ones.
- the reinforcements 171 are radial to the axis of the schematized sleeve and define therebetween several free spaces, or secondary cavities, such as 155a, 155b.
- each liner 135, 135 a. length L or axial dimension (axis B) of between 10 and 50 cm, an outer section (such as an outer diameter) between 5 and 20 cm, an inner section (such as an inner diameter) between 4 and 10 cm and a radial thickness e, e 1. .. between 1 and 10cm, on average at the location of a given section.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Description
La présente invention concerne un moule de fabrication par coulée centrifuge de pièces métalliques en particulier d'aubes de turbomachine. Sont plus particulièrement visées les aubes de roue de turbine d'un turboréacteur ou d'un turbopropulseur d'avion.The present invention relates to a mold for manufacturing by centrifugal casting of metal parts, in particular turbomachine blades. More specifically, the turbine wheel vanes of a turbojet or an airplane turbo-prop.
Il est connu de réaliser des aubes de turbomachine par usinage d'une ébauche obtenue de fonderie par coulée d'un alliage métallique. L'ébauche est typiquement un barreau en général de forme allongée pleine et elle est usinée dans la masse pour réaliser la géométrie finale des aubes.It is known to make turbomachine blades by machining a blank obtained by casting by casting of a metal alloy. The blank is typically a rod of generally elongated solid shape and is machined in the mass to achieve the final geometry of the blades.
Une des techniques d'obtention de l'ébauche consiste, comme dans
- plusieurs chemises, chacune définissant un logement de réception de l'alliage s'étendant radialement autour dudit axe (A)
- au moins un exosquelette dans lequel sont disposées les chemises, ledit au moins un exosquelette retenant ces chemises vis-à-vis d'une force centrifuge.
- a plurality of sleeves, each defining a housing for receiving the alloy extending radially about said axis (A)
- at least one exoskeleton in which the jackets are disposed, said at least one exoskeleton retaining these jackets with respect to a centrifugal force.
Un (premier) problème à résoudre concerne le contrôle de la vitesse de refroidissement pour favoriser l'obtention d'une microstructure maitrisée, telle un taux d'aluminium homogène dans la pièce, notamment si l'alliage est à base de TiAl.A (first) problem to be solved concerns the control of the cooling rate to promote the production of a controlled microstructure, such as a level of homogeneous aluminum in the part, especially if the alloy is based on TiAl.
Concernant la fabrication par coulée de barreaux dans un moule permanent centrifugé, on note en outre que les conditions de coulées conduisent à un second problème, à savoir, l'usure rapide des moules, ce qui impose d'en changer souvent, ce qui est cher et impacte les conditions de fabrication, notamment les cadences. Ceci a également un impact sur les formes données aux moules, donc aux pièces moulées.Concerning the manufacture by bar casting in a centrifuged permanent mold, it is furthermore noted that the casting conditions lead to a second problem, namely, the rapid wear of the molds, which necessitates changing them often, which is expensive and impacts the manufacturing conditions, including the rates. This also has an impact on the shapes given to the molds, and thus to the molded parts.
La présente invention permet de remédier à au moins une partie des inconvénients précités de façon simple, efficace et économique.The present invention overcomes at least some of the aforementioned drawbacks simply, efficiently and economically.
A cet effet, elle propose que, transversalement à la direction radiale (B) suivant laquelle chaque chemise s'étend, un espace existe périphériquement entre ladite chemise et l'exosquelette qui l'entoure.For this purpose, it proposes that, transversely to the radial direction (B) according to which each liner extends, a space exists peripherally between said liner and the surrounding exoskeleton.
Ainsi, non seulement on va pouvoir dissocier les caractéristiques physiques du ou des exosquelettes de caractéristiques physiques des chemises qui pourront en particulier être de faible épaisseur et/ou dans un matériau différent de celui du/des exosquelettes, mais aussi gérer favorablement l'inertie thermique, en vue de favoriser un refroidissement homogène de la forme de l'alliage coulé. Prévoir que l'espace entre ladite chemise et l'exosquelette est défini au sein d'une structure alvéolaire s'étendant périphériquement entre chaque chemise et l'exosquelette qui l'entoure permettra typiquement de tendre vers les deux buts ci-avant, y compris, par cette structure en caissons, de favoriser la tenue recherchée aux efforts mécaniques, et en particulier la retenue des chemises lors de la centrifugation.Thus, not only will we be able to dissociate the physical characteristics of the exoskeleton or physical characteristics of the shirts which may in particular be thin and / or in a material different from that of the exoskeleton (s), but also favorably manage the thermal inertia , in order to promote a homogeneous cooling of the shape of the cast alloy. Providing that the space between said jacket and the exoskeleton is defined within a peregrely extending cellular structure between each liner and the exoskeleton surrounding it will typically allow for the above two goals, including by this box structure, to promote the desired resistance to mechanical forces, and in particular the retention of shirts during centrifugation.
Réaliser le ou les exosquelettes à claire-voie favorisera aussi cette tenue mécanique aux efforts liés à la centrifugation. Il y a là également un avantage vis-à-vis de l'inertie thermique qui sera alors plus faible que si le ou les même(s) exosquelette(s) étai(en)t à paroi pleine.Achieving the open-skeleton exoskeleton (s) will also promote this mechanical resistance to efforts related to centrifugation. There is also an advantage vis-à-vis the thermal inertia which will then be lower than if the same (s) exoskeleton (s) were (in) t solid wall.
Par ailleurs et de préférence :
- une fixation, qui peut être amovible, sera établie entre chaque chemise et l'exosquelette qui l'entoure et/ou,
- le moule comprendra un bloc central présentant des conduits par lesquels l'alliage coulera et qui communiqueront avec l'intérieur des chemises, une fixation amovible étant alors établie entre chaque chemise et/ou l'exosquelette qui l'entoure et le bloc central.
- a fastener, which may be removable, will be established between each folder and the surrounding exoskeleton and / or,
- the mold will comprise a central block having conduits through which the alloy will flow and which will communicate with the interior of the shirts, a removable attachment being then established between each sleeve and / or the surrounding exoskeleton and the central block.
Ainsi, notamment quand l'usure le demande, on pourra assurer un remplacement des chemises (par exemple toutes les 25 coulées environ), tout en assurant le maintien de ces chemises entretemps.Thus, especially when wear demand, we can ensure a replacement of the shirts (for example every 25 castings), while ensuring the maintenance of these shirts meanwhile.
Les chemises pourront être changées à moindre coût, alors que le reste de la structure du moule, en particulier le ou les exosquelettes, pourra être conservé.The shirts can be changed at a lower cost, while the rest of the mold structure, particularly the exoskeleton (s), can be preserved.
Dans ce contexte, on conseille donc que le ou les exosquelettes et les chemises soient conçus pour que le moule soit permanent, les chemises devant donc tenir plusieurs coulées de suite (par exemple 25 environ).In this context, it is therefore recommended that the exoskeleton (s) and the shirts be designed so that the mold is permanent, the shirts thus having to hold several castings in succession (for example approximately 25).
Concernant de nouveau la maîtrise de l'inertie thermique permettant un refroidissement homogène de la forme en métal issue du moule, et en particulier une maitrise de la vitesse de refroidissement, primordiale pour obtenir un taux d'aluminium homogène dans une pièce en alliage métallique à base de TiAl et donc une microstructure maitrisée, il est par ailleurs recommandé que les chemises du moule soient en acier, alliage métallique et/ou en céramique, et soient donc adaptées pour qu'y soit coulé de façon centrifugée un alliage de TiAl en fusion.Concerning again the control of the thermal inertia allowing a homogeneous cooling of the metal form resulting from the mold, and in particular a mastery of the cooling rate, essential to obtain a homogeneous aluminum content in a piece of metal alloy to TiAl base and thus a mastered microstructure, it is further recommended that the mold jackets be made of steel, metal alloy and / or ceramic, and are therefore suitable for spinning centrifugally molten TiAl alloy .
Il est aussi recommandé qu'au moins une structure thermiquement isolante s'étende périphériquement entre chaque chemise et l'exosquelette qui l'entoure.It is also recommended that at least one thermally insulating structure extends peripherally between each liner and the surrounding exoskeleton.
Ainsi le ou chaque exosquelette pourra présenter une forme très simple, pas ou peu travaillée pour cette maîtrise recherchée de l'inertie thermique, et cela d'autant plus si ladite structure thermiquement isolante est alvéolaire. A noter par ailleurs qu'une telle solution, de par sa structure en caissons, permettra typiquement de favoriser la tenue aux efforts mécaniques, et en particulier la retenue des chemises lors de la centrifugation.Thus the or each exoskeleton may have a very simple shape, not or little worked for this desired control of thermal inertia, and all the more so if said thermally insulating structure is alveolar. Note also that such a solution, by its structure in boxes, typically will promote the resistance to mechanical forces, and in particular the retention of shirts during centrifugation.
Tel est d'ailleurs un effet attendu si, comme conseillé, la chemise considérée et la structure alvéolaire, qui comprend des parois séparant des cavités, sont en appui l'une contre l'autre ou se rejoignent par des zones discrètes, ceci étant par ailleurs bénéfique à une maîtrise de l'inertie thermique.Such is, moreover, an expected effect if, as recommended, the jacket in question and the honeycomb structure, which includes walls separating cavities, bear against each other or are joined by discrete zones, this being by elsewhere beneficial to a control of the thermal inertia.
On pourra obtenir une bonne tenue mécanique, par transfert d'efforts via lesdites parois de séparation des cavités, mais également assurer si nécessaire une isolation thermique de la chemise vis-à-vis du/des exosquelettes, via un matériau et des formes adapté(e)s.It is possible to obtain a good mechanical strength, by transfer of forces via said cavity separation walls, but also if necessary to insure a thermal insulation of the jacket vis-à-vis the exoskeleton (s) via a suitable material and shapes ( s).
Pour encore favoriser cette tenue aux efforts, on recommande que la structure considérée définisse une partie au moins desdits moyens de centrage qui positionnent donc la chemise considérée par rapport à l'exosquelette.To further promote this resistance to efforts, it is recommended that the structure in question defines at least part of said centering means which therefore position the shirt in relation to the exoskeleton.
Pour par ailleurs encore favoriser davantage le remplacement des chemises en termes de facilité de manipulation et/ou de temps passé, et de coûts, on privilégiera le caractère modulaire des moules, de telle sorte que la chemise, la structure alvéolaire et/ou thermiquement isolante qui l'entoure et l'exosquelette qui entoure ladite structure soient trois éléments dissociables entre eux, la chemise et la structure thermiquement isolante étant engagés dans l'exosquelette, concentriquement.
Y compris pour favoriser la prise en compte des questions de: maîtrise d'une part des efforts et d'autre part des contraintes thermiques, il est en outre proposé
qu'individuellement les chemises présentant une surface interne qui délimite le/un conduit central de coulée de l'alliage,
une partie extrême radialement extérieure de ce conduit est épaulée.Furthermore, to further favor the replacement of the shirts in terms of ease of handling and / or time and costs, the modular nature of the molds will be favored, so that the jacket, the honeycomb and / or thermally insulating structure surrounding it and the exoskeleton surrounding said structure are three separable elements between them, the jacket and the thermally insulating structure being engaged in the exoskeleton, concentrically.
Including to encourage the taking into account of the questions of: control on the one hand of the efforts and on the other hand of the thermal stresses, it is furthermore proposed
that individually the jackets having an inner surface which delimits the / a central casting duct of the alloy,
a radially outer end portion of this conduit is supported.
D'autres avantages et caractéristiques de l'invention apparaîtront à la lecture de la description suivante faite à titre d'exemple non limitatif et en référence aux dessins annexés dans lesquels :
- la
figure 1 est une vue schématique de face d'un barreau cylindrique plein de la technique antérieure, dans lequel sont destinées à être usinées des aubes de turbomachine, - la
figure 2 est une vue schématique d'un moule de la technique antérieure, - la
figure 3 est une vue schématique de dessus d'un moule à chemises et exosquelettes, dans lequel seront moulés des barreaux ayant moins de ségrégation, - les
figures 4,5,6,7 ,8,9 ,10 ,11,12,13 ,14,15 schématisent des chemises et exosquelettes suivant divers modes de réalisation, en vue de face (figures 4,6 ), coupes schématiques longitudinales (l'un des axes radiaux B ;figures 12 ,14 ,) ou transversale (figure 7 , coupe VII-VII,figure 11 , coupe XV-XV,figure15 ,), et vues de côté (figure 5 -vue suivant V- etfigures 8,9,10 ), lafigure 13 étant un détail d'une variante de réalisation de zones identiques à celle référencée XIIIfigure 12 .
- the
figure 1 is a schematic front view of a solid cylindrical bar of the prior art, in which are intended to be machined turbomachine blades, - the
figure 2 is a schematic view of a mold of the prior art, - the
figure 3 is a schematic view from above of a shirt and exoskeleton mold, in which bars having less segregation will be molded, - the
Figures 4,5,6,7 ,8.9 ,10 ,11,12,13 ,14,15 schematically folders and exoskeletons according to various embodiments, in front view (figures 4,6 ), longitudinal schematic sections (one of the radial axes B;figures 12 ,14 ,) or transverse (figure 7 , section VII-VII,figure 11 , XV-XV cup,Figure15 ,), and side views (figure 5 -view following V- andFigures 8,9,10 ), thefigure 13 being a detail of an alternative embodiment of zones identical to that referenced XIIIfigure 12 .
Le barreau 11 peut avoir une forme cylindrique et est plein. Il est obtenu par coulée d'un alliage métallique dans un moule.The
La
Le dispositif 10 comprend une enceinte 120 fermée et étanche dans laquelle est appliqué un vide partiel. Un lingot 16 en alliage métallique, en l'espèce contenant de l'aluminium, et plus précisément dans l'exemple à base de TiAl, est d'abord fondu dans un creuset 14. En fusion, il est versé dans un moule 13 métallique permanent.The
Le moule 13 permet de couler l'alliage par centrifugation, afin d'obtenir des barreaux 11. Pour cela, il est mis en rotation autour d'un axe A vertical. Le moule 13 comprend plusieurs logements 17, par exemple cylindriques de section circulaire, qui s'étendent radialement (axes B1,B2 ;
Après refroidissement, le moule 13 est démonté et les barreaux moulés 11 sont extraits. Les parois du moule qui entourent les logements 17 de recueillement du métal ont des épaisseurs importantes pour résister aux efforts centrifuges, typiquement plus de 10 g.After cooling, the
Ces épaisseurs peuvent conduire à une inertie thermique forte et créer des gradients thermiques importants lors du refroidissement du métal coulé, générateurs d'une différence dans la microstructure du barreau au voisinage de son centre par rapport à celle vers sa périphérie. Les pièces issues des barreaux 11 peuvent donc présenter des différences de microstructures (ségrégations).These thicknesses can lead to a high thermal inertia and create significant thermal gradients during cooling of the cast metal, generating a difference in the microstructure of the bar near its center relative to that to its periphery. The parts from the
Par ailleurs, en cas d'usure, il faut changer la partie du moule entourant le logement radial 17 concerné.Furthermore, in case of wear, it is necessary to change the part of the mold surrounding the
L'invention permet d'apporter une solution au problème cité de ségrégations et, si nécessaire, de satisfaire aux exigences de résistance aux efforts centrifuges et de changement rapide et fréquent d'une partie au moins du moule.The invention makes it possible to provide a solution to the cited problem of segregations and, if necessary, to meet the requirements of resistance to centrifugal forces and rapid and frequent change of at least part of the mold.
Les
Le moule 130 diffère du moule 13 dans la réalisation de certains de ses moyens structuraux, en particulier de ses logements radiaux de réception de l'alliage.The
Spécifiquement, autour du bloc central 131, par les conduits internes coudés 132 duquel l'alliage est amené à se répartir radialement autour de l'axe central vertical A, sont régulièrement espacés des chemises 135 (ou par exemple 135a,135b
Les chemises, qui sont donc creuses, sont disposées dans au moins un exosquelette 137, et de préférence dans autant d'exosquelettes qu'il y a de chemises, chaque exosquelette contenant alors une chemise 135 définissant l'un desdits logements.The shirts, which are thus hollow, are arranged in at least one
Le ou les exosquelettes retiennent les chemises vis-à-vis des forces centrifuges générées par la rotation du moule. De préférence, ils favoriseront (ou du moins ne feront pas obstacle à) une limitation de l'inertie thermique.The exoskeleton (s) retain the jackets with respect to the centrifugal forces generated by the rotation of the mold. Preferably, they will promote (or at least do not hinder) a limitation of the thermal inertia.
Dans la réalisation préférée illustrée
Pour un équilibre lors de la rotation, on conseille une disposition concentrique (axe B) de chaque couple chemise 135 et exosquelette 137 périphérique.For balance during rotation, a concentric arrangement (axis B) of each pair of
A son extrémité radialement extérieure (partie extrême 134b), chaque conduit 133 présente un fond plein 135c.At its radially outer end (
De manière comparable, chaque exosquelette 137 présente, à son extrémité radialement intérieure, une ouverture 137a par où, par exemple, une chemise 135 peut passer et, à son extrémité radialement extérieure, un fond 137b qui peut participer à la retenue radiale de la chemise.In a comparable manner, each
On constate également
Ainsi il va être possible de séparer les chemises des exosquelettes et du bloc central 131, notamment pour remplacer ces chemises. De nouveau, des fixations vissées peuvent convenir.Thus it will be possible to separate the shirts from the exoskeletons and the
Les fixations amovibles établies entre chemises et exosquelette(s) et/ou entre le bloc central 131 et chemises et/ou exosquelette(s) pourront former des zones de ruptures de ponts thermiques.The removable fasteners established between shirts and exoskeleton (s) and / or between the
Quoi qu'il en soit, pour limiter l'inertie thermique, comme recherché, il est conseillé que le comportement thermique des chemises soit prépondérant par rapport à celui du/des exosquelette(s).Anyway, to limit the thermal inertia, as desired, it is advised that the thermal behavior of the shirts is preponderant compared to that of the exoskeleton (s).
Dans un mode préféré de réalisation, le ou les exosquelettes est/sont en acier doux, aciers ou alliages plus ou moins réfractaires et les chemises sont en acier doux, aciers ou alliages plus ou moins réfractaires et/ou céramique.In a preferred embodiment, the exoskeleton (s) is / are made of mild steel, steels or alloys that are more or less refractory and the sheaths are made of mild steel, steels or alloys that are more or less refractory and / or ceramic.
La
Sur les
Ils se présentent ainsi comme des cages en quelque sorte grillagées.They are thus like cages somehow meshed.
Pour favoriser une faible inertie thermique, on prévoit ici qu'un espace vide 155 existe périphériquement (autour de l'axe B) entre chaque chemise, telle 135a, et l'exosquelette, tel 137a, qui l'entoure.To promote a low thermal inertia, it is provided here that a
Des moyens de centrage 157 positionnent, de façon fixe au moins pendant la centrifugation, la chemise considérée par rapport à l'exosquelette, pour la coulée (voir
Les
Les surfaces intérieures respectives réunies des coquilles définissent au moins la majeure partie du barreau moulé 110.The respective inner surfaces of the shells define at least the major part of the
Ces coquilles s'ouvrent et se ferment suivant une surface de joint des coquilles, tel le plan de joint 152. Ainsi, L'une de ces coquilles (telle 135a) peut constituer une porte mobile ou amovible vis-à-vis de l'autre, permettant de démouler la pièce.These shells open and close along a joint surface of the shells, such as the
En outre, une fixation séparable 153, telle un verrou, est établie entre les coquilles pour, une fois les coquilles séparées, pouvoir sortir le barreau 110 de l'intérieur de la chemise, ici 135a, considérée, par l'ouverture 154 libérée.In addition, a
Dans la solution des
La structure alvéolaire 159 peut être annulaire. Elle peut occuper un espace entre le fond 135c des chemises et celui 137b de l'exosquelette considéré (
Y compris pour les transferts thermiques recherchés, la
Plutôt qu'en des pièces distinctes, on pourrait prévoir de réaliser la chemise et la structure alvéolaire en une seule pièce (
En alternative, il sera possible de réaliser chaque chemise, telle 135a, ladite structure 159 qui l'entoure et l'exosquelette, tel 137a, qui entoure cette structure, en trois éléments distincts, dissociables entre eux, la chemise et la structure étant engagés dans l'exosquelette, concentriquement, suivant donc une radiale B à l'axe A.Alternatively, it will be possible to make each jacket, such as 135a, said
La surface transversale 165 sera de préférence un épaulement interne de l'exosquelette.The
L'extrémité radialement extérieure 134b pourra être ouverte, l'exosquelette ressemblant alors à une structure traversée de part en part par au moins un passage, où la/chaque chemise concernée est reçue.The radially
Un bouchon rapporté 167 (qui peut être amovible) bouchera alors cette extrémité radialement extérieure 134b, à la manière du fond 135a précité.An attached plug 167 (which may be removable) will then plug this radially
Favorablement, le/chaque bouchon 167 ne pénétrera pas dans l'exosquelette au-delà de la surface transversale 165. Ainsi, la chemise ne viendra pas en appui contre lui, ce qui est préférable lors de la centrifugation.Favorably, the / each
Au moins dans le cas des
On aura compris que ceci permet :
- que l'insert assure l'obtention de la géométrie souhaitée pour la pièce coulée et permette d'en contrôler la solidification, par maîtrise des contraintes thermiques,
- et que la structure extérieure assure le positionnement du moule sur le montage de coulée centrifuge ainsi que la résistance mécanique de l'ensemble.
- that the insert ensures obtaining the desired geometry for the casting and allows to control the solidification, by controlling the thermal stresses,
- and that the outer structure ensures the positioning of the mold on the centrifugal casting assembly and the mechanical strength of the assembly.
Pour les montages/démontages axiaux, une pente de un degré minimum sera de préférence ménagée entre structure et insert. Ceci permettra de rentrer/sortir la chemise le long de l'exosquelette, suivant l'axe B, tout en les centrant de façon coaxiale, au contact l'un de l'autre. Une fixation amovible sera en outre, de fait (par serrage), établie entre la chemise et l'exosquelette qui l'entoure. Le volume intérieur des chemises 135 peut être de géométrie simple (cylindre, rectangle, cône ou combinaison) ou complexe. De façon générale toute forme démoulable suivant le plan de fermeture des demi-coquilles est a priori acceptable.For axial assemblies / disassemblies, a slope of a minimum degree will preferably be provided between the structure and the insert. This will allow the shirt to come in / out along the exoskeleton, along the B axis, while concentrating them coaxially, in contact with each other. In addition, a detachable fastener will be made (by tightening) between the jacket and the surrounding exoskeleton. The interior volume of the
Pour persévérer dans la maîtrise des contraintes thermiques, de préférence en combinaison avec celle des efforts, il est conseillé que, transversalement à la direction radiale suivant laquelle elles s'étendent (axe B de la chemise considérée), les chemises présentent chacune au moins une épaisseur qui varie le long de ladite direction radiale (longueur L) et qui est, au moins globalement, plus faible vers l'une au moins des extrémités radialement intérieure et extérieure, 134a, 134b, qu'en partie intermédiaire, comme montré
Si nécessaire en liaison avec cet aspect (mais ce pourrait être une forme de pièce moulée à privilégier), la
Quant à la partie extrême radialement extérieure de ce conduit, près de l'extrémité 134b (
Typiquement si au moins une aube, par exemple BP (basse pression), est plus tard usinée dans le barreau coulé, la forme en entonnoir/goulotte pourra correspondre à la zone de talon de cette aube et la partie terminale 133b élargie à la zone du pied élargi.Typically if at least one blade, for example BP (low pressure), is later machined in the cast bar, the funnel / chute shape may correspond to the heel area of this blade and the
Toujours à fins de maîtrise des efforts et de gain de masse, en liaison avec l'évolutivité contrôlée de l'épaisseur de paroi de la chemise, voire de maîtrise des contraintes thermiques, il est encore précisé qu'individuellement tout ou partie des chemises 135 pourront présenter, transversalement à la direction radiale B suivant laquelle elles s'étendent, une surface périphérique radiale 170 au moins localement (ou partiellement) usinée, comme schématisé
Sur cette figure, on constate par ailleurs que des renforts longitudinaux 171 peuvent être prévus pour assurer la rigidité, le centrage et/ou le guidage de la chemise 135 concernée dans la structure périphérique 137. Les renforts sont radialement saillants par rapport au reste de la chemise concernée.In this figure, it can also be seen that
Un positionnement des renforts 171 vers les extrémités radiales 134a, 134b permettra de dégager les zones intermédiaires sur la longueur du moule, là où la présence d'au moins un espace (vide) 155 est favorable à la maîtrise des contraintes, y compris thermiques.A positioning of the
Pour une utilisation sous vide du moule, ce(s) espace(s) libre(s) ou cavités secondaires 155a, 155b établi(es) entre la structure périphérique 137 et la face extérieure de la chemise 135 considérée, y compris s'il s'agit des surfaces extérieures des (demi-)coquilles usinées, il est recommandé une "mise à l'air" extérieur de l'espace 155.For vacuum use of the mold, this (s) free space (s) or
Pour cela, il est proposé que cet espace 155 soit en communication fluide avec l'environnement extérieur du moule par l'intermédiaire d'au moins un orifice 175. Dans un exemple particulier de réalisation, chaque chemise 135,135a... pourra avoir une longueur L ou dimension axiale (axe B) comprise entre 10 et 50cm, une section (tel un diamètre) externe compris entre 5 et 20cm, une section (tel un diamètre) interne compris entre 4 et 10cm et une épaisseur radiale e,e1... comprise entre 1 et 10cm, en moyenne à l'endroit d'une section donnée.For this, it is proposed that this
Claims (10)
- A rotary mold mounted to spin about an axis (A), for centrifugal casting of an alloy, the mold comprising:- a plurality of liners (135), each defining a recess (17) for receiving the alloy, and extending radially about said axis (A); and- at least one exoskeleton (137) inside which the liners (135) are disposed, and that retains said liners against a centrifugal force;said mold being characterized in that, transversely to the radial direction (B) in which each liner extends, a space (155, 163) exists peripherally between said liner and the exoskeleton that surrounds it.
- A mold according to claim 1, characterized in that it further comprises a central block (131) having ducts (132) via which the alloy is cast, and which communicate with the insides (133) of the liners, and a releasable fastening (141 a, 142a) is established between the central block and at least one element chosen from each liner and the exoskeleton that surrounds said liner.
- A mold according to any preceding claim, characterized in that the at least one element chosen from among said at least one exoskeleton and the liners is individually provided with a moving door (143a,150a) that, in the open position, opens up an opening (145, 154) making it possible to pass the liner (135) in question through it, and a cast piece (110) coming from the solidified cast alloy, respectively.
- A mold according to any preceding claim, characterized in that the space (155) is empty and centering zones (157, 159, 171) position the liner to be considered in a fixed manner relative to said at least one exoskeleton, for the casting.
- A mold according to any preceding claim, characterized in that said at least one exoskeleton (137) is open-work.
- A mold according to any preceding claim, characterized in that the space (155, 163) is defined within a cellular structure (159) extending peripherally between each liner and the exoskeleton that surrounds it.
- A mold according to claim 6, characterized in that the liner to be considered and the cellular structure (159), which has walls separating the cavities, bear against each other.
- A mold according to claim 6, characterized in that the liner to be considered and the cellular structure (159), which has walls separating the cavities, meet via discrete zones.
- A mold according to any one of claims 6 to 8, characterized in that the liner, said cellular structure (159) and the exoskeleton that surrounds the cellular structure are three elements that are mutually dissociable, the liner and the cellular structure being engaged in the exoskeleton concentrically.
- A mold according to any preceding claim, characterized in that the liners are made of steel, of a metal alloy, and/or of a ceramic adapted so that such a TiAl metal alloy, in the molten state, can be centrifugally cast into them.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1450799A FR3017061B1 (en) | 2014-01-31 | 2014-01-31 | MOLD SHIRT FOR CENTRIFUGAL CASTING |
PCT/FR2015/050208 WO2015114262A1 (en) | 2014-01-31 | 2015-01-29 | Lined mould for centrifugal casting |
Publications (2)
Publication Number | Publication Date |
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EP3099438A1 EP3099438A1 (en) | 2016-12-07 |
EP3099438B1 true EP3099438B1 (en) | 2018-04-11 |
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EP15708562.2A Active EP3099438B1 (en) | 2014-01-31 | 2015-01-29 | Lined mould for centrifugal casting |
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US (1) | US9764381B2 (en) |
EP (1) | EP3099438B1 (en) |
JP (1) | JP6495308B2 (en) |
CN (1) | CN106132591B (en) |
BR (1) | BR112016017708B1 (en) |
CA (1) | CA2938286C (en) |
FR (1) | FR3017061B1 (en) |
RU (1) | RU2687320C2 (en) |
WO (1) | WO2015114262A1 (en) |
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FR3017062B1 (en) * | 2014-01-31 | 2023-03-17 | Snecma | CENTRIFUGAL MOLD JACKET WITH CONTROLLED THERMAL INERTIA |
CA3094276A1 (en) * | 2018-03-21 | 2019-09-26 | Schubert & Salzer Feinguss Lobenstein Gmbh | Method for producing a casting mould for filling with melt and casting mould |
CN112916815B (en) * | 2021-01-28 | 2022-05-03 | 济宁国弘机械科技有限公司 | Corrosion-resistant and good centrifugal casting machine of sealing performance |
CN113618052B (en) * | 2021-10-13 | 2021-12-14 | 江苏利润友机械科技有限公司 | Integrated casting production equipment for ship propeller |
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SU925538A1 (en) * | 1980-09-29 | 1982-05-07 | Ижевский Завод Тяжелых Бумагоделательных Машин | Ingot mould for centrifugal casting |
JPS6027464A (en) * | 1983-07-25 | 1985-02-12 | Kubota Ltd | Vertical type casting mold for centrifugal casting |
JPS62124060A (en) * | 1985-11-22 | 1987-06-05 | Kubota Ltd | Core setter for centrifugal casting machine |
CN87207819U (en) * | 1987-05-07 | 1988-10-05 | 机械委郑州机械研究所 | Enclosed centrifugal casting machine |
JPH09141409A (en) * | 1995-11-15 | 1997-06-03 | Kubota Corp | Metallic mold for centrifugal casting |
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DE19846781C2 (en) | 1998-10-10 | 2000-07-20 | Ald Vacuum Techn Ag | Method and device for producing precision castings by centrifugal casting |
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US6755239B2 (en) * | 2001-06-11 | 2004-06-29 | Santoku America, Inc. | Centrifugal casting of titanium alloys with improved surface quality, structural integrity and mechanical properties in isotropic graphite molds under vacuum |
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2015
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US9764381B2 (en) | 2017-09-19 |
CN106132591B (en) | 2021-05-28 |
JP2017507028A (en) | 2017-03-16 |
US20160339511A1 (en) | 2016-11-24 |
FR3017061B1 (en) | 2019-06-07 |
RU2016131338A3 (en) | 2018-10-22 |
RU2016131338A (en) | 2018-03-05 |
JP6495308B2 (en) | 2019-04-03 |
BR112016017708A2 (en) | 2017-08-08 |
CA2938286A1 (en) | 2015-08-06 |
BR112016017708B1 (en) | 2021-02-23 |
CN106132591A (en) | 2016-11-16 |
CA2938286C (en) | 2022-05-10 |
EP3099438A1 (en) | 2016-12-07 |
RU2687320C2 (en) | 2019-05-13 |
WO2015114262A1 (en) | 2015-08-06 |
FR3017061A1 (en) | 2015-08-07 |
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