• 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 invention relates to a device (1) for the manufacture of a three-dimensional part (6) by selective melting on a bed of powder, the device comprising: a first reservoir (8) intended to contain a first powder, said reservoir being provided with a first powder distribution valve (8a), at least one second reservoir (9) for containing a second powder different from the first powder, said reservoir being provided with a second powder distribution valve (9a), control means (8b) of the quantity of first powder delivered by the first valve, control means (9b) of the quantity of second powder delivered by the second valve, a mixing chamber (10) in selective communication with the first and second valves, said chamber comprising a third powder distribution valve (10a) and means (11a, 11b) for mixing the powder particles contained in said chamber, a support (5) for ini to receive the powder delivered by the third valve and on which is intended to be manufactured the piece, powder spreading means (12) on the support, and a heating member (13) for locally fusing the powder spread on the support. The invention also relates to a method for manufacturing a part by selective melting on a powder bed.
    公开号:FR3044944A1
    申请号:FR1562291
    申请日:2015-12-14
    公开日:2017-06-16
    发明作者:Jean-Baptiste Mottin；Guillaume Fribourg
    申请人:SNECMA SAS；
    IPC主号:
    专利说明:

    Background of the invention
    The present invention relates to the general field of producing parts by additive manufacturing. The invention is more particularly applicable to processes for manufacturing three-dimensional parts with a gradient of properties by selective melting on a powder bed.
    The property gradient pieces are pieces that include portions having different properties, for example different materials, a different granular structure, and the like.
    We are looking more and more to manufacture parts with varied properties including to optimize their mass and / or reliability. For example, one can choose a material adapted to each portion of the room, depending on the environmental and thermomechanical stresses to which the portion will be subjected. Thus, one can increase the reliability of the part by optimizing the properties of each portion, and in some cases reduce the overall mass by choosing for portions that allow lighter materials.
    Such a reduction in the mass of the parts is desirable in the aeronautical field, where the current problems relate precisely to the reduction of the onboard weight in the turboshaft engines, in order to reduce the fuel consumption.
    However, the manufacture of such a piece is generally difficult. For example, the means for manufacturing traditional metal or metal alloy parts, such as foundry or machining, generally do not allow their realization. When it is desired to manufacture a part with a gradient of properties, it is customary to divide the part into sub-pieces having different properties, then to glue or braze them together. Such practices are long and costly.
    The devices used to manufacture parts by additive manufacturing, for example by selective melting on a powder bed (of the "Selective Laser Melting" or "Electron Beam Melting" type), make it possible to produce complex three-dimensional parts in one piece more simply and at a lower cost compared to the aforementioned traditional methods. At present, these devices and the associated manufacturing methods do not make it possible to manufacture parts with a gradient of properties.
    Object and summary of the invention
    The main purpose of the present invention is thus to allow the manufacture of parts with a gradient of properties by additive manufacturing, and more particularly by selective melting on a powder bed, in particular to obtain a better relationship between the reliability of the part and its mass. .
    This object is achieved by means of a device for the manufacture of a three-dimensional part by selective melting on a bed of powder, the device comprising: a first reservoir intended to contain a first powder, said reservoir being provided with a first distribution valve of powder, - at least a second reservoir intended to contain a second powder different from the first powder, said reservoir being provided with a second powder distribution valve, - means for controlling the quantity of first powder delivered by the first valve, - means for controlling the quantity of second powder delivered by the second valve, - a mixing chamber in selective communication with the first and second valves, said chamber comprising a third powder distribution valve and means for mixing the powder particles contained in said chamber, - a support intended to receive powder delivered p the third valve and on which is intended to be manufactured the piece, - powder spreading means on the support, and - a heating member for locally fused powder spread on the support.
    The device according to the invention is advantageous in that it makes it possible to manufacture an integral part which has portions whose properties may be different, and to provide a transition in the form of a property gradient between these portions. .
    The piece is, in a manner known in itself, manufactured by a stack of successive layers and integral with selectively fused powder. The device according to the invention makes it possible to vary the composition of each layer as and when the workpiece is manufactured. Indeed, the tanks can be filled with two different powders, for example two powders comprising different materials or an identical material but a different particle size, and choose, for each layer, the proportion of each powder that will be present in the layer. It is thus possible to increase the reliability of the part by ensuring a transition of properties in the form of a composition gradient between the different portions of the part, the gradient being produced in the manufacturing direction of the part. In addition, one can also optimize the mass of the part obtained by choosing the best material or the best particle size adapted to each portion, depending on the stresses to which it will be subjected in operation.
    The tanks are provided with powder dispensing valves and the device comprises means for controlling the quantity of powder that they deliver. Thus, it is possible, for example, to control, by means of an automaton, the powder distribution valves in order to obtain a determined quantity of powder in the mixing chamber and to ensure precise control of the composition of each layer that will be fused by the powder. heating member on the support.
    The device according to the invention is also remarkable in that it makes it possible to mix the powders in the mixing chamber before they are deposited, which ensures that the deposited powder is homogeneous.
    Preferably, the device further comprises means for controlling the quantity of powder or a mixture of powders delivered by the third valve.
    The control means may comprise a balance for weighing powder.
    Also preferably, the means for mixing the powder particles contained in the mixing chamber comprises an inlet port and a gas flow outlet opening within the mixing chamber, said inlet and outlet ports. gas flow being configured to circulate a gas in the mixing chamber to mix the powder contained in said chamber. In addition, the gas outlet may comprise means for preventing powder present in the mixing chamber from leaving said chamber.
    The means for mixing the powder particles contained in the mixing chamber may comprise a kneader or a propeller.
    More preferably, a powder dispensing valve is driven by a piezoelectric actuator or a hydraulic actuator. In addition, the powder dispensing valve can be controlled by means of controlling the amount of powder delivered by said valve.
    The powder spreading means may comprise a roller or a scraper. The heater may comprise a laser or an electron beam generator. The invention also relates to a method for manufacturing a three-dimensional part by selective melting on a powder bed, the part comprising a successive stack of layers, the method comprising, for the manufacture of a layer, the following steps: a) delivery a controlled quantity of a first powder from a first reservoir, b) delivery of a controlled quantity of a second powder different from the first from a second reservoir, c) mixing of the first and second powders delivered in steps a) and b), d) depositing a layer of the mixture of the first and second powders obtained in step c), and e) melting at least a portion of the layer of powder deposited in the step d).
    As mentioned above in connection with the device of the invention, the process according to the invention is particularly remarkable in that the first and second powders delivered are mixed before being deposited. This makes it possible in particular to obtain a deposited layer of powder which is homogeneous, and to produce layers comprising a mixture of several powders. In the process according to the invention, the first powder is different from the second. By "different" is meant that they may comprise a different material or a different particle size, for example the two powders may comprise the same material but have different particle sizes, or comprise a different material and an identical particle size, or else comprise materials and different particle sizes. In addition, the quantities of first powder and second powder delivered from the tanks are controlled, for example by means of control means such as a balance, which allows to obtain accurate composition gradients.
    The controlled amount of first powder and / or the controlled amount of second powder may vary between two successive layers. The invention finally relates to a method such as that described above in which the part to be manufactured is a part for aeronautics. "Aeronautical part" means a part that can be used in a jet engine intended to propel an aircraft, for example: an aeronautical turbine engine blade, turbine ring sectors, a turbine disk, a turbine system injection of an aircraft combustion chamber, an aeronautical injection system component, a flange, a clamping system, a motor equipment support a hood, etc.
    BRIEF DESCRIPTION OF THE DRAWINGS Other characteristics and advantages of the present invention will emerge from the description given below, with reference to the appended drawings which illustrate exemplary embodiments which are devoid of any limiting character. In the figures: FIG. 1 is a diagrammatic sectional view of a device according to one embodiment of the invention, FIG. 2 is a flowchart representing the main steps of a method according to the invention, and FIGS. 3A to 3C illustrate a first example of application of the invention for the manufacture of a turbine blade, and FIGS. 4A and 4B illustrate a second example of application of the invention for the manufacture of a turbine disk. low pressure turbine.
    Detailed description of the invention
    An embodiment of a device according to the invention will be described in connection with FIG. 1. Such a device makes it possible to manufacture a part by selective melting on a powder bed with a gradient of properties.
    The device 1 comprises first of all a frame, part of which is a fixed plate 2, another part comprises a manufacturing zone 3 situated next to the fixed plate 2 in which the part is intended to be manufactured, and a recovery tank of powder 4 located next to the manufacturing zone 3 and opposite the fixed plate 2.
    The manufacturing zone 3 is provided with a mobile support 5 intended to receive powder and on which a piece 6 will be manufactured. The support 5 here takes the form of a plate able to move vertically as and when the manufacture of the part 6. The support 5 can for example be mounted on a hydraulic cylinder. Before starting the manufacture of a part, the upper surfaces of the fixed plate 2 and the support 5 are aligned horizontally.
    The device 1 further comprises a powder dispenser member 7 inside which are disposed a first 8 and a second 9 powder reservoir. In general, the first reservoir 8 comprises a first powder, and the second reservoir 9 comprises a second powder, different from the first. The reservoirs 8, 9 are located at the top in the powder dispenser 7. By way of example, the two reservoirs may contain two different powders, for example comprising different materials and of identical particle size, or comprising a material identical and different grain sizes, or comprising different materials and different grain sizes.
    In the case where the first reservoir contains a metal alloy and the second reservoir a pure metal, it becomes possible to modify the composition of the alloy using pure metal during the manufacturing process and as needed.
    In the case where the first reservoir contains a powder of given particle size, and where the second reservoir contains the same powder with a smaller particle size, it becomes possible to control the density of the part obtained by adjusting the amount of powder from the second tank. In fact, by adding more powder from the second tank, whose grains are smaller, the density of the piece is increased.
    In the case where the first reservoir contains a powder of a first material, and wherein the second reservoir contains a powder of a second material different from the first but chemically compatible with the first, it becomes possible to make a part comprising two materials with a compositional gradient between the two materials (or, in other words, a "soft" transition between the two materials). This increases the reliability of the room and its holding.
    Each of the tanks 8, 9 is provided with a powder dispensing valve 8a, 9a, at its lower end. These powder distribution valves 8a, 9a are here in communication with a mixing chamber 10 in the form of a cavity housed in a lower part of the powder dispenser member 7. In this way, the reservoirs 8, 9 are here located above the mixing chamber 10. For example, the mixing chamber 10 may have a volume preferably between 0.5 cm3 and 10 cm3, or even between 0.5 cm3 and 100 cm3, so as to store the quantity of powder necessary to produce a layer of powder on the support 5. Of course, the volume of the mixing chamber will be adapted to the use, in particular to the surface of the support 5 and to the layer thicknesses envisaged . The powder dispenser member 7 further comprises means for controlling the amount of powder delivered by the dispensing valves 8a, 9a. These means take, in the illustrated example, the form of scales 8b, 9b able to weigh powder, which are for example located below the corresponding powder distribution valves 8a, 9a. These scales 8b, 9b can be connected to a servo system (not shown) of the corresponding powder distribution valves 8a, 9a, in order to control the quantities of powder delivered by each of them precisely and automatically.
    The mixing chamber 10 here has a substantially conical shape and is also provided with a powder dispensing valve 10a located at its lower end. The powder dispensing member 7 is positioned such that the valve 10a of the mixing chamber 10 is above the fixed plate 2. Furthermore, in the example shown, the fixed plate 2 comprises a balance 10b able to weigh the powder delivered by the valve 10b, which can, as before, slave the valve 10a by a servo system not shown. By way of example, the powder distribution valves 8a, 9a, 10a can be controlled by a piezoelectric actuator or a hydraulic actuator. The scales 8b, 9b, 10b may in turn be electronic scales preferably having a sensitivity of 0.1g, more preferably a sensitivity of 0.01g or even more preferentially a sensitivity of 0.001g.
    The mixing chamber 10 also comprises means for mixing the powder particles that it contains. These means comprise, in the illustrated example, an inlet port 11a and an outlet orifice 11b of gas flows which open into the mixing chamber 10. A gas is intended to enter the chamber 10 through the orifice of entry 11a, circulating in the chamber to ensure the mixing of the powders, then out of the chamber through the outlet 11b. The outlet orifice 11b may comprise a protective cover 11c preventing powder from escaping from the mixing chamber 10 through the outlet orifice 11b. Note that there may be several inlet ports 11a and 11b outlet, in particular to control the path of the gas flow in the mixing chamber.
    The means for mixing the powder particles contained in the mixing chamber 10 may also be mechanical, and consist for example of a kneader or a propeller (not shown) actuated by an electric motor. A combination of the means for mixing the powder particles described above can also be envisaged within the same device.
    In the illustrated example, the powder dispensing member 7 is fixed, as well as the mixing chamber 10 which is permanently located below the tanks 8, 9 of powder. Note that the invention is not limited to fixed tanks 8, 9 or a fixed mixing chamber 10, but that these elements can be movable in the device 1. In other words, the mixing chamber 10 can be in selective communication with the valves 8a, 9a and move to recover successively powder from a reservoir, then from the other reservoir. In addition, the number of tanks is not limited to two and it is not beyond the scope of the invention using more than two powder tanks.
    The device 1 also comprises powder spreading means on the support. In the illustrated example, these means comprise a roller 12 (or a scraper) which can move horizontally from one end of the fixed plate 2 to the powder recovery tank 4. This roller 12 can be adjustable in height so as to control the thickness of the layer of powder deposited on the support 5. In the initial position, the roller 12 is located near the valve 10a, opposite the support 5, so as to push the powder delivered by the valve 10a and spread it on the support 5.
    In addition, the device 1 comprises a heating element 13 intended to fuse the powder deposited on the support 5. In the example illustrated, the heating member comprises a generating portion 13a of a laser beam or a beam of electrons, and a guide portion 13b of the laser beam or the electron beam. In the case of a laser, the guiding portion 13b may comprise optical means (for example movable mirrors) which make it possible to move the laser beam on the support 5. In the case of a beam of electrons, the portion guide 13b may comprise coils adapted to deflect the electron beam.
    Finally, the device 1 can be controlled automatically by an automaton (not shown), which will be responsible for controlling the support 5, the powder dispensing member 7 (and in particular the servocontrol of the powder dispensing valves 8a, 9a, 10a) and the heating member 13.
    A method of manufacturing a three-dimensional piece by selective melting on a powder bed will now be described in connection with the flowchart of FIG. 2, and the device of FIG.
    In a manner known per se, in a method of manufacturing a piece by selective melting on a bed of powder, there is available a quantity of powder that is deposited or spread uniformly with the aid of spreading means on the 5, then the heating member 13 merges parts of the powder layer deposited on the support 5. The previous steps are repeated to obtain the final piece.
    In the process according to the invention, in order to manufacture a layer of the part, a quantity of first powder is first obtained (step Ela). This quantity of first powder is for example derived from a first reservoir 8, and was delivered into the mixing chamber 10 by means of the powder dispensing valve 8a associated with the first reservoir 8. It is possible to control the quantity delivered in the chamber 10 using for example a balance 8b.
    Then, a quantity of a second powder (step Elb) is obtained, the second powder being different from the first (for example of a different material or of a different particle size). This quantity of second powder is for example issued from a second reservoir 9, and was delivered into the mixing chamber 10 by means of the powder dispensing valve 9a associated with the second reservoir 9. The quantity delivered can be controlled. in the chamber 10 using for example a balance 9b. The steps Ela and Elb can be performed simultaneously, or successively.
    Once the quantities of the two powders in the mixing chamber 10, they are mixed in the chamber 10 (step E2). For example, a neutral gas such as Argon is circulated in the chamber through the inlet ports 11a and 11b gas flow, for a time sufficient for the mixture to be homogeneous. Alternatively, mechanical means such as a kneader or a helix can be used, as previously described.
    The mixed powder obtained is then poured from the mixing chamber 10 onto the fixed plate 2 by means of the dispensing valve 10a. A balance 10b, possibly present below the valve 10a, makes it possible to control the quantity of the mixture of powders delivered (step E3).
    Then, the powder mixture obtained is deposited on the support 5 (step E4). To do this, the roller 12 (or other spreading means), moves towards the support 5 by driving with it the powder delivered by the valve 10a. The support 5 has previously been lowered by a height corresponding to the thickness required for a layer. The roller 12 spreads the powder uniformly on the support and causes the possible surplus of powder towards the recovery tank 4.
    Before the roll 12 returns to its initial position, the heating member 13 is activated and selectively fuses portions of the powder layer deposited on the support 5 (step E5) to form a slice of the workpiece.
    Finally, the roll 12 returns to its initial position, and the preceding steps can be repeated for each layer. To achieve compositional gradients in the part, it is advantageous to vary the amounts of first and / or second powder between two successive layers.
    It will be noted that the method according to the invention can be used to manufacture only part of a part, the other part of the part that can be manufactured, in a manner known per se, by using a single type of powder.
    Examples of application of a method according to the invention will now be described for the manufacture of parts for aeronautics, including a turbine blade (Example 1) and a low pressure turbine disk (Example 2).
    Example 1
    We are interested in the manufacture of an aerospace turbine engine turbine blade such as that illustrated schematically in FIG. 3A.
    In a manner known per se, the blade 20 comprises a blade 21 which extends between a foot 22 and a head 23. The blade 20 is further provided with a lower platform 24 and an upper platform 25 which define between them a stream of flow of gas. The blade 20 is mounted on a disk and is rotated in the turbomachine. In operation, the blade 21 is subjected to the conditions imposed by the hot gas flow, while the foot portions 22 and the head 23 are protected from the vein by the platforms 24, 25 and are subjected to lower temperatures. The blade 20 is manufactured layer by layer in the direction Z corresponding to the longitudinal direction in which the blade 20 extends. Thus, the blade 20 can be roughly divided into three portions which are the foot 22 with the lower platform 24, the blade 21, and the head 23 with the upper platform 25, which are subject to different environmental conditions. It is therefore possible, by means of a process according to the invention, to manufacture such a blade 20 in one piece by selective melting on a bed of powder by varying the composition of the powder between the different portions of the piece, in particular to reduce its mass.
    In addition, the method according to the invention makes it possible to create a composition gradient between the different portions to ensure a smooth transition of composition between these portions, and to increase the reliability of the part.
    Diagrammatically represented by hatched rectangles in FIG. 3A are different zones a, b, c, d and e of the blade 20, which may comprise different compositions in powders.
    A first example of a composition gradient of the layers as a function of the zones of the blade 20 is represented on the graph of FIG. 3B. In this graph, the composition is represented in a powder A and a powder B in the blade 20 as a function of the zones of the blade presented above. In this first example, the zone a corresponding to the root of the blade 20 is manufactured solely using a powder A. Then, in the zones b, ç and d, corresponding to the platforms 24, 25 and the blading 21, the proportion of powder A and powder B varies linearly to a proportion of 100% powder B in the zone e corresponding to the head 23 of the blade 20.
    A second example of a composition gradient of the layers as a function of the zones of the blade 20 is shown in the graph of FIG. 3C. Zone a is first manufactured only with powder A. The powder composition in zone c is 66% powder A and 33% powder B. Zone b is a linear transition zone of composition between the zone a and the zone ç. Then, the zone d is a linear transition zone of composition between the zone ç and the zone e. The proportion of powder B in zone e is 100%.
    In the two examples of composition gradients described above with reference to FIGS. 3B and 3C, the powder A can for example comprise an alloy of the Inconel® 718 type with a particle size defined by a dia of less than 50 μm, and the powder B can by for example, to include a Hastelloy® X type alloy having a dia less than 50 μm.
    Note that it is also possible to manufacture in the same manner other types of blades, such as bi-material compressor blades, for example whose foot of the blade comprises a titanium-based alloy Til7, and the blade comprises a TA6V titanium-based alloy.
    Example 2
    We are interested in the manufacture of a low-pressure turbine turbine rotor disk 30 such as that shown schematically in FIG. 4A. The disc 30 has fixing holes 31, a portion 32 forming a flange which will be stressed in fatigue (especially at the mounting holes 31) and a portion 33 forming a rim which will be biased creep.
    To ensure a good creep resistance of the part, it is sought to obtain a microstructure having grains of larger size, while to ensure good fatigue performance, smaller grains are preferable. Indeed, creep deformation occurs because of grain boundary slips, increasing grain size reduces the number of grain boundaries and their cumulative length. Conversely, to reduce the propagation of a crack (and therefore increase the fatigue resistance), it is sought to increase the number of grain boundaries by reducing their size.
    The disc 30 is made from layers of fused powder and stacked for example along the Y axis, the part 32 being manufactured before the part 33. Thus, thanks to a method according to the invention, it is possible to manufacture such disc 30 in one piece by selective melting on a powder bed by varying the composition of the powder between the two parts 32, 33, to optimize its granular structure according to the stresses to which it will be subjected.
    In addition, the method according to the invention makes it possible to create a gradient between the granular structures of parts 32 and 33 to ensure a smooth transition of properties between these parts, and to increase the reliability of the part.
    Diagrammatically represented by hatched rectangles in FIG. 4 are the different zones f, g and h of the part, which may comprise different compositions in powders. The zone f substantially corresponds to the flange portion 32, the zone h substantially corresponds to the rim portion 33, and the zone g is the intermediate zone between the portions 32 and 33 of the disc 30.
    FIG. 4B shows an example of an evolution of the composition into two powders C and D in the disk 20 as a function of the area of the disk in question. Zone f is made from only powder C and zone h is made from only powder D. Intermediate zone g is a linear transition zone of composition between zones f and g. In this way, care will be taken to choose a powder C which forms finer grains than the powder D.
    The table below gives three examples CD1, CD2 and CD3 of couples of powders of metal alloys C and D which can be used to manufacture a disc 20 by a method according to the invention and whose mechanical properties of fatigue resistance. and creep are optimized according to the areas of the room.
    权利要求:
    Claims (10)
    [1" id="c-fr-0001]
    1. Device (1) for the manufacture of a three-dimensional part (6) by selective melting on a bed of powder, the device comprising: - a first reservoir (8) intended to contain a first powder, said reservoir being provided with a first powder dispensing valve (8a), - at least one second reservoir (9) for containing a second powder different from the first powder, said reservoir being provided with a second powder dispensing valve (9a), - control means (8b) for the quantity of first powder delivered by the first valve, - control means (9b) for the quantity of second powder delivered by the second valve, - a mixing chamber (10) in selective communication with the first and second valves, said chamber comprising a third powder distribution valve (10a) and means (11a, 11b) for mixing the powder particles contained in said chamber, - a support (5) for dispensing powder delivered by the third valve and on which the piece is intended to be manufactured, - powder spreading means (12) on the support, and - a heating member (13) for locally fusing the powder spread on the support.
    [2" id="c-fr-0002]
    2. Device according to claim 1, further comprising control means (10b) of the amount of powder or a mixture of powder delivered by the third valve.
    [3" id="c-fr-0003]
    3. Device according to any one of claims 1 and 2, wherein the powder quantity control means comprise a balance (8b, 9b, 10b) for weighing powder.
    [4" id="c-fr-0004]
    4. Device according to any one of claims 1 to 3, wherein the means for mixing the powder particles contained in the mixing chamber comprises an inlet port (11a) and an outlet port (11b) of gas flow within the mixing chamber (10), said gas flow inlet and outlet ports being configured to circulate a gas in the mixing chamber to mix the powder contained in said chamber.
    [5" id="c-fr-0005]
    5. Device according to any one of claims 1 to 4, wherein the means for mixing the powder particles contained in the mixing chamber comprises a kneader or a propeller.
    [6" id="c-fr-0006]
    6. Device according to any one of claims 1 to 5, wherein a powder dispensing valve (8a, 9a, 10a) is controlled by a piezoelectric actuator or a hydraulic actuator.
    [7" id="c-fr-0007]
    7. Device according to any one of claims 1 to 6, wherein the heating member (13) comprises a laser or an electron beam generator.
    [8" id="c-fr-0008]
    8. A method of manufacturing a three-dimensional part (6) by selective melting on the powder bed, the part comprising a successive stack of layers, the method comprising, for the manufacture of a layer, the following steps: a) delivery of a controlled quantity of a first powder (step Ela) from a first reservoir, b) delivering a controlled quantity of a second powder (step Elb) different from the first from a second reservoir, c) mixing the first and second powders (step E2) delivered in steps a) and b), d) depositing (step E4) a layer of the mixture of the first and second powders obtained in step c), and e) melting (step E5) of at least a portion of the powder layer deposited in step d).
    [9" id="c-fr-0009]
    9. The method of claim 8, wherein the controlled amount of first powder and / or the controlled amount of second powder varies between two successive layers.
    [10" id="c-fr-0010]
    10. A method according to any one of claims 8 and 9, wherein the part to be manufactured is a part for aeronautics (20, 30).
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    同族专利:
    公开号 | 公开日
    WO2017103392A1|2017-06-22|
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    US20210346961A1|2021-11-11|
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    法律状态:
    2016-12-09| PLFP| Fee payment|Year of fee payment: 2 |
    2017-06-16| PLSC| Publication of the preliminary search report|Effective date: 20170616 |
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    2018-09-14| CD| Change of name or company name|Owner name: SAFRAN AIRCRAFT ENGINES, FR Effective date: 20180809 |
    2019-11-20| PLFP| Fee payment|Year of fee payment: 5 |
    2020-11-20| PLFP| Fee payment|Year of fee payment: 6 |
    2021-11-18| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1562291A|FR3044944B1|2015-12-14|2015-12-14|DEVICE AND METHOD FOR MANUFACTURING A THREE-DIMENSIONAL PART BY SELECTIVE FUSION ON A POWDER BED|FR1562291A| FR3044944B1|2015-12-14|2015-12-14|DEVICE AND METHOD FOR MANUFACTURING A THREE-DIMENSIONAL PART BY SELECTIVE FUSION ON A POWDER BED|
    PCT/FR2016/053305| WO2017103392A1|2015-12-14|2016-12-09|Device and method for manufacturing a three-dimensional part via selective powder-bed fusion|
    US16/062,548| US11141793B2|2015-12-14|2016-12-09|Device and a method for fabricating a three-dimensional part by selectively melting a powder bed|
    US17/382,850| US20210346961A1|2015-12-14|2021-07-22|Device and a method for fabricating a three-dimensional part by selectively melting a powder bed|
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