• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to an installation for manufacturing a part by implementing a Bridgman process including in particular a mold (6) intended to receive a molten material and a movable heat shield (21) with respect to the mold (6). ) intended to be positioned in front of the solidification front (S) during directed solidification.
    公开号:FR3061722A1
    申请号:FR1750167
    申请日:2017-01-09
    公开日:2018-07-13
    发明作者:David Grange；Gilles Martin
    申请人:Safran Aircraft Engines SAS；Safran SA；
    IPC主号:
    专利说明:

    ® Agent (s): CABINET BEAU DE LOMENIE.
    ® INSTALLATION FOR THE MANUFACTURE OF A PART BY IMPLEMENTING A BRIDGMAN PROCESS. @) The present invention relates to an installation for the manufacture of a part by implementing a Bridgman process comprising in particular a mold (6) intended to receive a molten material and a mobile heat shield (21) relative to the mold (6) intended to be positioned opposite the solidification front (S) during directed solidification.
    FR 3,061,722 - A1


    Invention background
    The invention relates to an installation for implementing a Bridgman process as well as a method for manufacturing a part implementing such an installation.
    The Bridgman process can be used to achieve directed solidification of a monocrystalline part. This technique allows the solidification front to advance in one direction, from one end to the other of the part. The oven used in this process comprises a hot zone, the temperature of which is higher than the melting temperature of the material intended to form the part, as well as a cold zone regulated at a temperature allowing the solidification of the molten material. The temperature of the hot zone can be maintained by radiation by susceptors heated by induction. A heat shield may be present at the border between the cold and hot zones. Between these two zones there is a strong temperature gradient.
    To solidify a part in a directed manner, the material is introduced in the molten state into a mold present in the hot part of the oven. The mold thus filled with the molten material is gradually moved towards the cold zone. The strong temperature gradient makes it possible to obtain a solidification front located at the border between the hot zone and the cold zone.
    It is however desirable to improve the properties and the quality of the parts obtained by implementing a Bridgman process.
    The invention aims to meet the above need.
    Subject and summary of the invention
    To this end, the invention proposes, according to a first aspect, an installation for manufacturing a part by implementing a Bridgman process, said installation comprising:
    at least one mold intended to receive a molten material, the mold being present in a heating zone located inside an enclosure,
    a cooling zone situated inside the enclosure and separated from the heating zone by a first thermal screen, the first thermal screen being fixed relative to the enclosure and being located on a first side of the mold, the heating zone being superimposed on the cooling zone along an axis of the enclosure,
    a first displacement system configured to move the mold in the enclosure from the heating zone to the cooling zone along the axis of the enclosure,
    a second heat shield movable relative to the mold separate from the first heat shield and located on a second side of the mold opposite the first side, and
    - A second displacement system, distinct from the first displacement system, configured to move the second heat shield in the enclosure along the axis of the enclosure.
    Studies carried out by the inventors have shown that the properties of the part to be obtained depend on the appearance of the local temperature gradient at the level of the solidification front and that the Bridgman techniques of the prior art do not allow obtain an optimal temperature gradient during all directed solidification. More specifically, the inventors have found that it is desirable, in order to improve the quality of the part obtained by directed solidification, that this thermal gradient has a minimum component in the direction perpendicular to the direction of solidification. In other words, it is desirable to tend as much as possible towards a perfectly stabilized temperature gradient, that is to say only directed along the direction of solidification. The fact of using one or more heat shields fixed relative to the mold stabilizes the temperature gradient only at certain moments of solidification but not at others.
    This observation is illustrated by FIGS. 1 and 2 which schematically reproduce the results of numerical simulations showing the appearance of the isothermal curves at the level of the solidification front S for a vertical advance of the latter from the bottom to the top (arrow F) in the context of a Bridgman process with a fixed heat shield relative to the mold. The installation illustrated in FIGS. 1 and 2 comprises a heat screen 10 fixed relative to the enclosure separating the hot zone (upper zone) from the cold zone (lower zone). This installation also comprises at least one additional thermal screen 14 connected to the mold and located on the side opposite to the screen 10. The thermal screen 14 is therefore fixed relative to the mold. FIG. 1 shows that the thermal screen 14 stabilizes the temperature gradient when the solidification front S is at the level of the screen 14. In this case the isothermal curves are substantially horizontal and the thermal gradient is therefore substantially directed along direction F. On the other hand, at an earlier time, these isothermal curves had a significant inclination and therefore a significant horizontal thermal gradient (Figure 2). In the latter case, we are moving away from the ideal aspect for the thermal gradient. The thermal screen 14 in fact generates a cold zone below it which destabilizes the thermal gradient when the solidification front S is below the screen 14. The inventors have therefore found that the implementation of the thermal screen 14 , fixed relative to the mold, does not allow the temperature gradient to be stabilized at any time of solidification. In particular, the inventors have found that the side of the mold C 2 opposite the heat shield 10 separating the hot zone from the cold zone exhibited excessive cooling at certain times of solidification relative to the side of the mold Ci situated on the side of this screen 10 (Figure 2). Such destabilization of the thermal gradient can lead to the generation of defects in the part obtained after solidification.
    The invention proposes an installation making it possible to improve the stability of the thermal gradient during directed solidification. The first and second heat shields are located on either side of each mold. The implementation of the second heat shield and the second displacement system advantageously makes it possible to have a heat shield, movable relative to the mold, making it possible to follow the solidification front during the directed solidification. Being able to modify the position of the second heat shield during directed solidification so as to position it facing the solidification front makes it possible to further stabilize the thermal gradient during solidification, to avoid excessive cooling on the side of the mold opposite to the first heat shield, and thus significantly improve the quality of the parts obtained.
    In an exemplary embodiment, the installation further comprises a third thermal screen fixed relative to the enclosure, distinct from the first and second thermal screens, said third thermal screen being present in the heating zone and being superimposed on the first thermal screen. along the axis of the enclosure.
    Such a characteristic is advantageous in order to limit the radiative losses towards the lower part of the enclosure.
    In an exemplary embodiment, the installation further comprises:
    - a fourth heat screen movable relative to the mold and distinct from the first and second heat screens and possibly from the third heat screen when the latter is present, the fourth heat screen being located on the second side of the mold and being superimposed on the second heat screen along the axis of the enclosure, the width of the fourth heat shield being less than the width of the second heat shield, and
    - A third movement system, distinct from the first and second movement systems, configured to move the fourth heat shield along the axis of the enclosure independently of the second heat shield.
    Such a characteristic is advantageous when the mold or molds used have a shape or dimensions leaving insufficient space for the second heat shield to follow the solidification front over the entire duration of solidification. Thus according to this exemplary embodiment, the second heat shield will follow the solidification front during a first phase of the directed solidification and will be positioned opposite this front during this phase. Once the second heat shield can no longer continue to follow the solidification front due to an insufficient space delimited by the mold or molds, the movement of the second heat shield will be stopped. The displacement of the fourth thermal screen will then be initiated using the third displacement system so that the fourth thermal screen, which is narrower than the second thermal screen, continues to follow the solidification front so as to be positioned facing the latter. . Such a characteristic therefore makes it possible to ensure stability of the thermal gradient throughout the directed solidification even when the geometry of the molds is such that the second thermal screen cannot follow the solidification front during the whole process.
    In an exemplary embodiment, the installation comprises a plurality of molds intended to receive the molten material and present in the heating zone, said molds being present around the second heat shield, the installation further comprising a heating system configured for heating the heating zone, the heating system and the first heat shield being present around said molds.
    The present invention also relates to a method for manufacturing at least one part by implementing a Bridgman method and the installation as described above, the method comprising at least:
    the introduction of a molten material into said at least one mold,
    the directed solidification of the molten material by moving said at least one mold comprising the molten material from the heating zone towards the cooling zone along the axis of the enclosure by actuation of the first displacement system, and
    - The displacement of the second heat shield along the axis of the enclosure by actuation of the second displacement system in order to position the second heat shield in front of the solidification front of the molten material during all or part of the directed solidification.
    In an exemplary embodiment, the second thermal screen is moved by positioning it opposite the solidification front during a first phase of directed solidification, then the fourth thermal screen is moved along the axis of the enclosure by actuation of the third displacement system to position the fourth heat shield in front of the solidification front of the molten material during a second phase of directed solidification.
    In an exemplary embodiment, the part may be a part of a turbomachine. In particular, the part can be a turbomachine blade, a distributor or a ring sector. In an exemplary embodiment, the part produced is an aeronautical turbomachine part. Alternatively, it is a terrestrial turbine part.
    In an exemplary embodiment, the molten material is a metallic material. Alternatively, the molten material is a ceramic material, for example a ceramic material of eutectic composition.
    The ceramic material forming the molten material may for example comprise at least: alumina AI2O3, zirconia ZrO 2 , a rare earth oxide, an aluminum and rare earth garnet RE 3 AI 5 0i 2 or a REAIO 3 perovskite, where RE denotes a rare earth element. The rare earth oxide can have the chemical formula RE 2 O 3 with RE as defined above and can for example be Y 2 O 3 or La 2 O 3 . The ceramic material may, for example, include alumina and zirconia. The ceramic material can be of eutectic composition and can for example be chosen from the following mixtures: AI 2 O 3 -ZrO 2 / AI 2 O 3 -YAG (YAG corresponding to Y 3 AI 5 0i 2 ), RE 3 AI 5 Oi 2 -AI 2 O 3 where RE is a rare earth element, AI 2 O 3 -RE 3 Al5Oi 2 -ZrO 2 and AI 2 O 3 -YAG-ZrO 2 .
    Alternatively, the molten material may be a metallic material, and for example be a superalloy such as a nickel superalloy.
    Brief description of the drawings
    Other characteristics and advantages of the invention will emerge from the following description, given without limitation, with reference to the appended drawings, in which:
    - Figures 1 and 2 are results of numerical simulations reproduced schematically showing the appearance of isotherms at the solidification front at different times of the implementation of a Bridgman process performed using an installation outside invention,
    FIG. 3 schematically and partially illustrates a first example of installation according to the invention,
    FIG. 4 schematically and partially illustrates a second example of installation according to the invention,
    FIGS. 5A to 5D schematically illustrate a way of positioning the second heat shield on the second displacement system,
    FIG. 6 schematically and partially illustrates a third example of installation according to the invention, and
    - Figures 7A and 7B schematically and partially illustrate a fourth example of installation according to the invention.
    Detailed description of embodiments
    FIG. 3 illustrates a first example of installation 1 according to the invention. Installation 1 constitutes a furnace for manufacturing a part by implementing a Bridgman process. The part obtained can be made of refractory material, for example metallic or ceramic material, for example ceramic material of eutectic composition. The part obtained can have a crystalline microstructure. The part obtained can for example be a turbomachine part, such as a turbomachine blade. In the examples of installation illustrated, the molds 6 each have a shape allowing the manufacture of a turbomachine blade.
    The installation 1 comprises an enclosure 3 defining an interior volume in which the Bridgman process is intended to be carried out. The enclosure 3 is fixed during the directed solidification. A reservoir 7 defining a volume V containing material 9 in fusion is present inside the enclosure 3. The reservoir 7 has a bottom 7a which is in communication with a plurality of channels 7b which each open into a separate mold 6 Thus, the molten material 9 crosses the channels 7b under the effect of gravity to be transferred to the molds 6 and fill the latter. The molds 6 each have the shape of the part to be obtained. Within a single installation, the molds 6 may be identical or may alternatively be different in terms of shape and / or dimensions. The example of installation 1 illustrated comprises a plurality of molds 6 but it is not going beyond the ambit of the invention when this installation comprises only one mold.
    The molds 6 are present in a heating zone 15 located in the upper part of the interior volume defined by the enclosure 3. In the example illustrated, the molds 6 are positioned circumferentially around the axis X of the enclosure 3. A heating system 4a and 4b is present inside the enclosure 3 and is configured to heat the heating zone 15 in order to melt the material. The heating system may include a first 4a and a second 4b susceptors as well as an inductor (not shown). When a current flows through the inductor, the inductor creates an electromagnetic field which induces in the susceptors 4a and 4b a current causing the latter to heat up. Each of the susceptors 4a and 4b laterally delimits the heating zone 15. The first susceptor 4a is superimposed on the second susceptor 4b along the axis of the enclosure X. The susceptors 4a and 4b are in the example illustrated separated by a heat shield 12. The heat shield 12 (third heat shield) is fixed relative to the enclosure 3 and therefore remains in the same position during the directed solidification. The upper part of the heating zone 15 is closed by an upper wall 5.
    The installation 1 also comprises a cooling zone 25 which is separated from the heating zone 15 by the first thermal screen 10. The first thermal screen 10 is fixed relative to the enclosure 3 and therefore remains in the same position for directed solidification. The third heat shield 12 is superimposed on the first heat shield 10 along the axis X of the enclosure. The third heat shield 12 is located above the molds 6. At least part of the mold is present in the enclosure 3 at a height between the height at which the first heat shield 10 is present and the height at which it is present the third thermal screen 12. These heights are measured along the axis X of the enclosure 3. The presence of the third thermal screen 12 is however optional. The cooling zone 25 is located in the lower part of the interior volume defined by the enclosure 3. The heating zone 15 is superimposed on the cooling zone 25 along the axis of the enclosure X. The cooling zone 25 comprises a cooling system 27 in which a cooling fluid circulates. The system 27 makes it possible to cool the cooling zone 25 and to maintain its temperature at a value allowing the solidification of the molten material 9. The cooling system 27 can as illustrated surround the cooling zone 25. The cooling system 27 delimits laterally the cooling zone 25. The cooling system 27 is located below the first heat screen 10. The first heat screen 10 is located between the heating system 4a and 4b and the cooling system 27.
    Each of the molds 6 is connected to a first displacement system configured to move the molds 6 from the heating zone 15 to the cooling zone 25. More precisely, each mold 6 has a lower end 6a secured to a movable support 8. The mobile support 8 is in the example illustrated in the form of a tray but it is not going beyond the ambit of the invention when the support 8 has a non-planar shape. The first displacement system comprises a first jack 17 configured to lower the support 8 and therefore the molds 6 in the direction Dl which is parallel to the axis X. The displacement of the molds 6 in the direction Dl makes it possible to cool the molten material 9 and to carry out its directed solidification in order to obtain the part by implementing the Bridgman process.
    FIG. 3 shows a configuration of the installation 1 during the implementation of the Bridgman process where it can be seen that each of the molds 6 contains a first solidified part 9a situated on the side of the cooling zone 25 and a second molten part 9 located on the side opposite this zone 25. The solidification front S separates the solidified part 9a from the molten zone 9 and moves along the direction F during the process.
    The installation 1 also comprises, in the example illustrated, an additional support element 11 extending along the axis X. The element 11 comprises a lower end 11a secured to the movable support 8 and an upper end 11b secured of the reservoir 7. The element 11 advantageously makes it possible to reinforce the assembly constituted by the molds 6 and the reservoir 7. The presence of this element 11 is however optional. When the movable support 8 is lowered in the direction D1, the assembly constituted by the molds 6, the channels 7b, the reservoir 7 and the additional element 11, when it is present, is moved as a whole towards the cooling zone 27.
    In the example illustrated, the first heat shield 10 is fixed and surrounds the molds 6. The first heat shield 10 has an annular shape. The heating system 4a and 4b also surrounds the molds 6 in the example illustrated. Thus, in this example, the molds 6 each have an external side Ci present opposite the first heat shield 10 and an internal side C2 located on the side opposite the first heat shield 10. The internal side C2 is located on the side of the internal volume VI of the heating zone 15 surrounded by the molds 6. The internal side C 2 is located on the side of the center of the heating zone. The external side Ci is located on the side of the external volume V2 of the heating zone 15 surrounding the molds 6. The external side Ci is located on the side of the periphery of the heating zone 15. The external sides Ci and internal C 2 correspond , for each mold, at two diametrically opposite sides of this mold.
    The installation 1 illustrated in FIG. 3 further comprises a second heat shield 21 of annular shape. The second heat shield 21 is present around the reinforcing element 11 (and of the axis X). This second heat shield 21 is present opposite the internal side C 2 of each of the molds 6. The second heat shield 21 is movable relative to the molds 6 and is intended to be moved in the enclosure 3 along the axis X during the Bridgman process so as to be positioned opposite the solidification front S (at the same height as the latter). Positioning the second heat shield 21 facing the solidification front S during the directed solidification advantageously makes it possible to reduce, or even eliminate, the horizontal thermal gradient and to obtain a part having improved quality and properties.
    In order to allow the movement of the second heat shield 21, the installation 1 comprises a second displacement system which comprises a plurality of jacks 19. Each of these jacks 19 is connected at its end 19a to the second heat shield 21 so as to allow the displacement of the latter along the axis X. Each of the jacks 19 has at its end 19a a support system on which the second heat shield 21 is placed. An example of a support system will be described below. The cylinders 19 of the second displacement system extend along the axis X through holes 8a formed in the movable support 8. The cylinders 19 are positioned circumferentially around the axis X. In the illustrated configuration in Figure 3, there is shown an upward movement (direction D2) of the second heat shield 21 following the actuation of the cylinders 19 but more generally the second heat shield 21 can be caused to be moved up or down down depending on the position of the solidification front during the Bridgman process. The materials constituting the fixed or mobile heat shields used are known per se. The heat shields can for example be made of carbon or carbon felt.
    The implementation of a Bridgman method using the installation of FIG. 3 will now be briefly described. The heating system 4a and 4b is actuated in order to melt the material present in the tank 7. The molten material 9 then flows under the effect of gravity in order to fill the molds 6. The first displacement system 17 is then actuated in order to lower the movable support 8 and the molds 6. Directed solidification of the molten material 9 is thus achieved due to the bringing together of the molten material 9 from the cooling zone 25. During the process, the interior of the enclosure 3 is maintained under vacuum. During this solidification, the solidification front S moves along the direction materialized by the arrow F. During the directed solidification, the second heat shield 21 is moved so as to be positioned at the same height as the solidification front S in order to stabilize the thermal gradient at the level of the front S. The signal coming from a device for detecting or estimating the position of the solidification front is transmitted to a control module in order to actuate the second displacement system and make vary the position of the second heat shield. The position of the solidification front can be detected from the temperature measurement carried out by thermocouples positioned in the vicinity of each of the molds. As a variant, the position of the solidification front can be estimated by numerical simulation during the solidification.
    FIG. 4 shows a variant installation 100 which differs from that of FIG. 3 in that the second heat shield 210 is no longer of annular shape but in the form of a disc. In the same manner as described above, a jack 190 of the second displacement system passes through the mobile support 80 through the orifice 80a. In the example illustrated, the jack 190 crosses the movable support 80 at the center of the latter. The jack 190 is configured to slide inside the jack 17 ensuring the setting in motion of the molds 6 towards the cooling zone 25. The jacks 17 and 190 extend along the same axis, corresponding in the example illustrated in l X axis. The second heat shield 210 is placed on the cylinder at its end 190a. The jack 190 makes it possible to move the second thermal screen 210 in the direction D2 in order to position this second thermal screen opposite the solidification front S during the directed solidification. It will also be noted that the example of installation 100 in FIG. 4 does not use an additional reinforcing element.
    FIGS. 5A to 5D illustrate the positioning of the second heat shield 210 on the second displacement system in the case of the installation 100 of FIG. 4, it being understood that a similar method can be used with the jacks 19 of the installation 1 in Figure 3.
    The jack 190 is firstly introduced at the orifice 80a so as to pass through the mobile support 80 (FIGS. 5A and 5B). The actuator 190 comprises a plurality of deployable rods 191 at its end 190a. The deployable rods 191 are initially retracted in order to allow the introduction of the jack 190 through the movable support 80. After introduction of the jack 190 through the movable support 80, the rods 191 are then deployed in order to form a support extending transversely , for example perpendicularly, relative to the axis of the cylinder 190 (Figure 5C). The second heat shield 210 is then placed on the support present at the end 190a of the jack 190 (FIG. 5D).
    Another variant of installation 1000 has been shown in FIG. 6. This installation 1000 is similar to installation 1 in FIG. 3 except that the jacks 1900 of the second displacement system pass through the upper wall 50 at the level of a plurality of orifices 50a and no longer the movable support 800. The second heat shield 2100 is of annular shape and rests on wedges 1901 secured to each jack 1900 at the ends 1900a. The wedges 1901 extend transversely, for example perpendicularly, relative to the jacks 1900 in order to maintain the second heat shield 2100.
    FIGS. 7A and 7B show an alternative installation 1100 which comprises, in addition to the second mobile heat screen 210, a fourth mobile heat screen 310 relative to the molds 6. The fourth heat screen 310 is located on the internal side C2 of each of the molds 6. The fourth heat shield 310 is superimposed on the second heat shield 210 along the axis of the enclosure X. In the same manner as described above, the first displacement system comprises a jack 170 configured to lower the movable support 80 and the molds 6 in the oven in order to solidify the molten material 9. The second displacement system comprises, in the example illustrated, a jack 190 at the end 190a of which the second heat shield 210 is present. The jack 190 is configured to slide inside the jack 170. The jacks 170 and 190 extend along the same axis, corresponding in the example illustrated to the X axis. The installation 1100 further comprises a third system movement which comprises a cylinder 290 at the end 290a of which the fourth heat shield 310 is present. The second cylinder 290 is configured to slide inside the first cylinder 190. The cylinders 190 and 290 extend along the same axis, corresponding in the example illustrated to the axis X. The width L2 of the fourth heat shield 310 is less than the width L1 of the second heat shield 210. Such an installation 1100 is advantageous when the molds 6 used have a shape or dimensions leaving insufficient space for the second heat shield 210 to follow the solidification front over the entire duration of solidification. In fact, it can be seen in FIG. 7A that the spacing e between the molds 6 at the points 6b is less than the width L1. In this way, the second heat shield 210 cannot rise to a higher position than that of the points 6b of the molds 6. Thus, according to this exemplary embodiment, the second heat shield 210 will follow the solidification front during a first phase of directed solidification and will be positioned opposite this front during this first phase. Once the second heat shield can no longer continue to follow the solidification front due to insufficient spacing e between the molds 6, the movement of the second heat shield 210 will be stopped. The displacement of the fourth thermal screen 310 will then be initiated using the third displacement system so that the fourth thermal screen 310, which is narrower than the second thermal screen, continues to follow the solidification front so as to be positioned opposite the latter (see Figure 7B and non-zero spacing d between the two heat shields 210 and 310). The second heat screen 210 can be kept fixed during the movement of the fourth heat screen 310. The fourth heat screen 310 has indeed a width L2 less than the spacing e and can therefore continue to follow the solidification front beyond the points 6b (see Figure 7B).
    In a variant not illustrated, one could use second 210 and fourth 310 annular heat shields.
    权利要求:
    Claims (9)
    [1" id="c-fr-0001]
    1. Installation (1; 100; 1000; 1100) for manufacturing a part by implementing a Bridgman process, said installation comprising:
    - at least one mold (6) intended to receive a molten material (9), the mold (6) being present in a heating zone (15) situated inside an enclosure (3),
    - a cooling zone (25) located inside the enclosure (3) and separated from the heating zone (15) by a first thermal screen (10), the first thermal screen (10) being fixed relative to to the enclosure (3) and being located on a first side (Ci) of the mold, the heating zone (15) being superimposed on the cooling zone (25) along an axis (X) of the pregnant (3),
    - a first displacement system (17; 170) configured to move the mold (6) in the enclosure (3) from the heating zone (15) to the cooling zone (25) along the axis (X ) of the enclosure (3),
    - a second mobile heat shield (21; 210; 2100) relative to the mold (6), distinct from the first heat shield (10) and located on a second side (C2) of the mold (6) opposite the first side (Ci ), and
    - a second displacement system (19; 190; 1900), distinct from the first displacement system (17; 170), configured to move the second heat shield (21; 210; 2100) in the enclosure (3) along the axis (X) of the enclosure (3).
    [2" id="c-fr-0002]
    2. Installation (1; 100; 1000; 1100) according to claim 1, further comprising a third fixed heat shield (12) relative to the enclosure (3), distinct from the first (10) and second (21; 210 ; 2100) heat shields, said third heat shield (12) being present in the heating zone (15) and being superimposed on the first heat shield (10) along the axis (X) of the enclosure (3).
    [3" id="c-fr-0003]
    3. Installation (1100) according to claim 1 or 2, further comprising:
    - A fourth mobile heat shield (310) relative to the mold (6) and distinct from the first (10) and second (210) heat shields and possibly the third heat shield when the latter is present, the fourth heat shield (310) being located on the second side (C 2 ) of the mold (6) and being superimposed on the second heat shield (210) along Tax (X) of the enclosure (3), the width (L2) of the fourth heat shield (310) being less than the width (L1) of the second heat shield (210), and
    - a third displacement system (290), distinct from the first (170) and second (190) displacement systems, configured to move the fourth heat shield (310) in the enclosure (3) along the axis (X ) of the enclosure (3) independently of the second heat shield (210).
    [4" id="c-fr-0004]
    4. Installation (1; 100; 1000; 1100) according to any one of claims 1 to 3, comprising a plurality of molds (6) intended to receive the molten material (9) and present in the heating zone (15 ), said molds (6) being present around the second heat shield (21; 210; 2100), the installation further comprising a heating system (4a; 4b) configured to heat the heating zone (15), the system heating (4a; 4b) and the first heat shield (10) being present around said molds (6).
    [5" id="c-fr-0005]
    5. A method of manufacturing at least one part by implementing a Bridgman method and the installation (1; 100; 1000; 1100) according to any one of claims 1 to 4, the method comprising at least :
    the introduction of a molten material (9) into said at least one mold (6),
    - Directed solidification of the molten material (9) by moving said at least one mold (6) comprising the molten material (9) from the heating zone (15) towards the cooling zone (25) along the axis (X) of the enclosure (3) by actuation of the first displacement system (17; 170), and
    - the displacement of the second heat shield (21; 210; 2100) along the axis (X) of the enclosure (3) by actuation of the second displacement system (19; 190; 1900) in order to position the second shield thermal (21; 210; 2100) opposite the solidification front (S) of the molten material (9) during all or part of the directed solidification.
    [6" id="c-fr-0006]
    6. Method according to claim 5, in which the second heat shield (210) is moved by positioning it in front of the solidification front during a first phase of directed solidification, then in which the fourth heat shield (310) is moved the along the axis (X) of the enclosure (3) by actuation of the third displacement system (290) in order to position the fourth heat shield (310) opposite the solidification front (S) of the molten material (9 ) during a second phase of directed solidification.
    [7" id="c-fr-0007]
    7. Method according to any one of claims 5 or 6, wherein the part is a part of a turbomachine.
    [8" id="c-fr-0008]
    8. The method of claim 7, wherein the part is a turbomachine blade.
    [9" id="c-fr-0009]
    9. Method according to any one of claims 5 to 8, in which the molten material (9) is a metallic material or a ceramic material.
    1/7
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    同族专利:
    公开号 | 公开日
    EP3346030A1|2018-07-11|
    CN108286068A|2018-07-17|
    US20180193906A1|2018-07-12|
    EP3346030B1|2019-03-06|
    CN108286068B|2021-02-26|
    FR3061722B1|2019-07-26|
    US10562096B2|2020-02-18|
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    EP0278762A2|1987-02-11|1988-08-17|PCC Airfoils, Inc.|Method and apparatus for use in casting articles|
    JP2002144019A|2000-11-02|2002-05-21|Mitsubishi Heavy Ind Ltd|Unidirectional solidified casting method and apparatus therefor|
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    CN104690256B|2015-02-11|2017-03-01|西北工业大学|Control the directional freeze method of nickel base superalloy step-like foundry goods stray crystal defect|CN109351951B|2018-11-29|2020-12-22|中国科学院金属研究所|Process method for reducing loosening defect of single crystal blade platform|
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    CN113046821A|2021-05-11|2021-06-29|宁国市华成金研科技有限公司|Multi-station directional solidification and single crystal casting furnace|
    法律状态:
    2017-12-18| PLFP| Fee payment|Year of fee payment: 2 |
    2018-07-13| PLSC| Publication of the preliminary search report|Effective date: 20180713 |
    2019-12-19| PLFP| Fee payment|Year of fee payment: 4 |
    2020-12-17| PLFP| Fee payment|Year of fee payment: 5 |
    2021-12-15| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1750167|2017-01-09|
    FR1750167A|FR3061722B1|2017-01-09|2017-01-09|INSTALLATION FOR MANUFACTURING A PART BY CARRYING OUT A BRIDGMAN PROCESS|FR1750167A| FR3061722B1|2017-01-09|2017-01-09|INSTALLATION FOR MANUFACTURING A PART BY CARRYING OUT A BRIDGMAN PROCESS|
    EP18150263.4A| EP3346030B1|2017-01-09|2018-01-04|Facility for manufacturing a workpiece by performing a bridgman method|
    US15/864,546| US10562096B2|2017-01-09|2018-01-08|Installation for manufacturing a part by implementing a Bridgman method|
    CN201810018895.XA| CN108286068B|2017-01-09|2018-01-09|Device for producing a part by implementing the Bridgman method|
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