• 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 for heating a bed of powder in an additive manufacturing apparatus, characterized in that it comprises: - a plasma generating device (20), said device being adapted to be arranged and moved to the above the powder bed, at a distance from the powder bed for generating plasma thereon, - a unit for the power supply (22) of said plasma generating device, - a control unit (9) for controlling the supply and displacement of the plasma generating device, and in that the plasma generating device (20) comprises a magnetic plasma confinement assembly.
    公开号:FR3079775A1
    申请号:FR1853031
    申请日:2018-04-06
    公开日:2019-10-11
    发明作者:Gilles Walrand；Tiberiu Minea；Charles Ballage；Daniel Lundin；Thomas Petty
    申请人:Centre National de la Recherche Scientifique CNRS；Universite Paris Sud Paris 11；AddUp SAS；
    IPC主号:
    专利说明:

    MAGNETIC CONTAINER HEATING DEVICE
    FOR SELECTIVE ADDITIVE MANUFACTURING APPARATUS
    GENERAL TECHNICAL AREA AND PRIOR ART
    The present invention relates to the general field of selective additive manufacturing.
    More particularly, it relates to the heating treatments, and in particular to preheating, possibly of post-treatment in situ by heating which is implemented on the powder beds before the selective melting.
    Selective additive manufacturing consists of making three-dimensional objects by consolidating selected areas on successive layers of powdery material (metallic powder, ceramic powder, etc.). The consolidated areas correspond to successive sections of the three-dimensional object. Consolidation is done, for example, layer by layer, by a total or partial selective fusion carried out with a power source (high power laser beam, electron beam, etc.).
    Conventionally, in order to avoid projections due to the electrostatic repulsion of adjacent powder particles which are charged under the effect of the beam of the power source, the powder bed is previously consolidated by preheating. This preheating ensures a rise in temperature of the powder bed at temperatures which can be quite substantial (approximately 750 ° C. for the titanium alloys).
    However, it has a high energy cost.
    It also represents a significant loss of cycle time.
    In order to optimize the performance of the power sources used, it is known to work in an airtight enclosure in which a partial vacuum is produced, in particular in order to reduce the energy transfers between the signal emitted by the power source and the atmosphere. surrounding so as to improve energy transfers between the power source and the powder bed.
    OVERVIEW OF THE INVENTION
    A general object of the invention is to overcome the drawbacks of the configurations proposed so far.
    In particular, an object of the invention is to propose a solution which allows heating without loading and lifting of powder.
    Another object is to provide a heating solution (carried out before or after a selective melting step) operating at very low pressure, so as to optimize the performance of the powder melting device.
    Yet another object is to propose a solution which makes it possible to reduce the costs and the preheating or post-treatment times by heating in the manufacturing cycles.
    Another object of the invention is to propose a simple construction solution.
    Another aim is also to provide an efficient heating solution, over a wide range of pressures, while remaining at low pressure (<0.1 mbar).
    Thus, according to a first aspect, the invention provides a device for heating a bed of powder in an additive manufacturing device, characterized in that it comprises:
    a plasma generation device, said device being adapted to be placed and moved above the powder bed, at a distance from the powder bed allowing the generation of the plasma thereon,
    a unit for the electrical supply of said plasma generation device,
    a control unit for controlling the supply and movement of the plasma generation device, and in that the plasma generation device comprises a magnetic plasma confinement assembly.
    In this way, the plasma is confined and located in a restricted area, optimizing the preheating of the powder bed.
    The energy efficiency of the heating cycle is therefore improved, thereby reducing the duration and the cost of a preheating or heating cycle.
    Such a device can advantageously be supplemented by the following characteristics, taken alone or in combination:
    - The plasma confinement assembly includes a magnetron-type device suitable for confining charged particles;
    - The magnetron device comprises an arrangement of magnets configured to confine electrons in a linear pattern;
    - The magnetron type device has a slot forming an ion source, the slot being formed through the electrode and opening out opposite the powder bed;
    - a gas is injected into the slot;
    - The plasma generation device is adapted to be moved with a main component of displacement perpendicular to the direction in which it extends;
    - The unit for the electrical supply of said plasma generation device comprises a high voltage source direct and / or radio frequency and / or pulse.
    According to a second aspect, the invention provides an apparatus for manufacturing a three-dimensional object by selective additive manufacturing comprising in an enclosure:
    a support for depositing successive layers of powder of additive manufacturing, a distribution arrangement suitable for applying a layer of powder on said support or on a previously consolidated layer, at least one power source suitable for the selective consolidation of a layer of powder applied by the dispensing arrangement, the apparatus comprising a heating device according to the present invention, the plasma generation device of the heating device being adapted to be placed and moved above the powder bed, a distance from the powder bed allowing the generation of the plasma thereon, the plasma generation device further comprising a magnetic plasma confinement assembly.
    This device may include a distribution arrangement comprising a squeegee or a layering roller, the plasma generation device extending close to said squeegee or roller and being movable therewith, or placed on an independent mobile device. like a robot arm for example.
    According to a third aspect, the invention proposes manufacturing a three-dimensional object by selective additive manufacturing, said method comprising the steps:
    Depositing a layer of powder on a previously solidified support or layer,
    Consolidation of the preheated zone, the consolidation being carried out by means of a power source, the method further comprising a step of heating at least one localized zone of the powder layer by means of a conforming heating device to the present invention, the heating of the powder bed being carried out by a confined plasma.
    Such a method can advantageously be supplemented by the following characteristics, taken alone or in combination:
    - during the heating step, the device for generating plasmaconfines the charged particles in a precise location, so as to control the formation of electrical discharges during the supply of the electrode, generating a confined plasma so as to maximize the heat transfer between the plasma and the powder bed;
    during the heating step, a gas is injected into the plasma generation device to be ionized there, the magnetic field inducing a projection of the ionized gas so as to generate a confined plasma jet, oriented towards the powder;
    - At least one heating step is carried out before and / or after the consolidation step.
    PRESENTATION OF THE FIGURES
    Other characteristics and advantages of the invention will emerge from the description which follows, which is purely illustrative and not limiting, and should be read with reference to the appended figures in which:
    - Figure 1 is a schematic representation of an additive manufacturing apparatus comprising a heating device according to a possible embodiment of the invention;
    - Figure 2 is a block diagram of a plasma generation device heating a powder bed according to the invention;
    - Figure 3 is a schematic sectional view of a magnetron plasma generation device according to the invention;
    - Figure 4 is a diagram of the structure of a magnet arrangement of a magnetron device according to the invention;
    - Figure 5 is a block diagram in 3D, seen from below, highlighting the operation of a magnetron cathode device according to the invention;
    - Figure 6 is a schematic sectional view showing an embodiment of a magnetron cathode device according to the invention alternatively equipped with a rotary electrode (cathode);
    - Figure 7 is a 3D representation, in bottom view, of a second embodiment of a plasma generation device with magnetic confinement generating an ion beam according to the invention (also known as inverted magnetron );
    - Figure 8 is a schematic representation of a powder bed heated by means of a heating device according to the invention.
    DESCRIPTION OF ONE OR MORE MODES OF IMPLEMENTATION AND IMPLEMENTATION
    Overview
    The apparatus 1 for selective additive manufacturing of FIG. 1 comprises:
    - A support such as a horizontal plate 3 on which are successively deposited the different layers of additive manufacturing powder (metal powder, ceramic powder, etc.) making it possible to manufacture a three-dimensional object (object 2 in the shape of a fir tree in the figure )
    - a powder reservoir 7 located above the plate 3,
    an arrangement 4 for the distribution of said metallic powder on the tray, this arrangement 4 comprising for example a squeegee 5 or a layering roller for spreading the different successive layers of powder (displacement according to the double arrow A),
    - a set 8 of energy sources for the fusion (total or partial) of the spread thin layers,
    a control unit 9 which controls the various components of the device 1 as a function of pre-stored information (memory M),
    - A mechanism 10 to allow the support of the plate 3 to descend as the layers are deposited (displacement according to the double arrow B).
    In the example described with reference to FIG. 1, the assembly 8 comprises two sources of consolidation:
    - an electron beam gun 11 and
    a laser type source 12.
    As a variant, the assembly 8 may comprise only one source, for example a source of energy located under vacuum or at very low pressure (<0.1 mbar): electron gun, laser source, etc.
    Still alternatively, the assembly 8 can also include several sources of the same type, such as for example several electron guns and / or laser sources, or means making it possible to obtain several beams from the same source.
    In the example described with reference to FIG. 1, at least one galvanometric mirror 14 makes it possible to orient and move the laser beam coming from the source 12 relative to the object 2 as a function of the information sent by the control 9.
    Any other deviation system can of course be envisaged.
    In another example not illustrated, the assembly 8 comprises several sources 12 of the laser type and the displacement of the different laser beams is obtained by moving the different sources 12 of the laser type above the layer of powder to be fused. Coils 15 and 16 for detection and focusing make it possible to deflect and locally focus the electron beam on the areas of layers to be sintered or fused.
    A heat shield T can be interposed between the source or sources of the assembly 8.
    The components of the device 1 are arranged inside a sealed enclosure 17 connected to at least one vacuum pump 18 which maintains a secondary vacuum inside said enclosure 17 (typically about ΙΟ -2 / 10 ' 3 mbar, even 10 -4 / 10 -6 mbar).
    The apparatus further comprises a heating device 19 disposed above the powder bed and able to move linearly with respect thereto.
    This heating device 19 can be placed behind the squeegee 5 or the layering roller on the same sliding carriage. It can also be mounted on an independent trolley or on a robot arm. In the latter case (not illustrated) the pattern described by the magnetic trap of the magnetron cathode can be of any other form than linear, allowing for example localized heating.
    The movement of said heating device 19, its supply and its residence time in front of the powder bed which it is desired to heat or preheat are also controlled by the unit 9.
    Magnetic confined linear discharge heating
    In the example illustrated in FIG. 2, the heating device 19 comprises a plasma generation device 20 which is moved above the metal powder bed (solid or granular surface 21, made up of micro- or nano-powder) .
    This plasma generation device 20 is supplied by an electrical excitation source 22 controlled by the control unit 9.
    The source 22 allows the application of a high voltage (> 0.2 kV) between the plasma generation device 20 and the surface 21 of the powder bed.
    The supply thus produced by the source 22 can be direct current, low frequency, radio frequency (RF), or pulse.
    The plasma generation device 20 generates, under the effect of said source 22, electrical discharges between the plasma generation device 20 and the surface 21 and creates a plasma, which heats the surface 21.
    The plasma generation device 20 extends substantially parallel to the surface 21. It is moved parallel to said surface 21, perpendicular to the direction in which it extends.
    Such a configuration allows homogeneous heating over a surface of the powder bed corresponding to the length of the plasma generation device 20 and to its displacement distance.
    The surface 21 of the powder bed is for example connected to ground.
    Heating can be carried out before the consolidation step, thus constituting a preheating step, so as to avoid powder splashes.
    Optionally, a heating step can be carried out after the consolidation step, thus constituting a post-heating step, so as to anneal the material or limit the quenching effect by the working atmosphere, or even to control the evolution of the temperature on cooling so as to obtain a particular crystalline structure.
    Linear magnetron device
    In order to generate a plasma at low pressure (<0.1 mbar) and in order to improve the performance of the plasma generation device 20, this device includes a magnetic plasma confinement system.
    FIG. 3 shows a plasma confinement assembly comprising a magnetron device 23 for generating linear plasma.
    It comprises an electrode 24, preferably negatively polarized (and playing, in this case, the role of cathode).
    An arrangement of magnets 25, placed opposite a first face of the electrode 24, generates a magnetic trap which allows the confinement of the electrons facing the other face of the electrode 24.
    The magnets can be permanent or electromagnets, or a combination of the two.
    Depending on requirements, electrode 24 can be supplied (source 22) with direct current (DC - direct current, in English), Radio Frequency (RF) or high power impulse mode (HiPIMS - High Power Impulse
    Magnetron Sputtering, but generally receiving a negative voltage.
    Depending on its mode of supply, the material constituting the electrode 24 can be an electrical conductor, an insulator or a semiconductor.
    In the case of an electrode 24 made of electrically conductive material, all the modes of electric supply are suitable.
    In the case of an electrode 24 made of non-conductive material, only the RF or pulse modes are suitable.
    A circulation 26 of a cooling fluid (for example water, glycol, etc.) is provided in the electrode 24, supplied by an external system.
    The refrigerant can for example be injected through orifices formed in one of the walls of the carriage 27, and can for example be circulated between the rows of magnets of the arrangement of magnets 25, the fluid thus also being in contact with the electrode 24 and cooling it.
    The refrigerant can then be extracted through a second orifice formed in the carriage 27.
    Such a magnetron device 23 is mounted inside the enclosure 17 on a carriage 27 arranged above the powder bed and able to move linearly relative to the latter (double arrow in the figure).
    This carriage 27 is for example that of the layering roller, the magnetron device 23 being disposed behind said roller (relative to the direction of advance thereof).
    With reference to FIG. 4, an example of an arrangement of magnets 25 comprises two rows of magnets arranged so as to form a linear track 28. The reverse polarities magnets are thus placed on either side of the track 28.
    In the example illustrated, the magnetic track 28 is closed.
    With reference to FIG. 5, the arrangement of magnets 25 is covered by the electrode 24.
    The magnetic field generated by the magnets traps the electrons around the magnetic field lines, on the side of the electrode 24 facing the powder bed, and thus increases the ionization of the gas along a linear pattern 29 located along of track 28, as illustrated in FIG. 5.
    This magnetic configuration concentrates the electrons and along the pattern 29, forming a plasma along the said pattern 29.
    In order to further increase the efficiency of the trap, an alternating arrangement is generally made (north outside and south in the center, or vice versa) to make a closed magnetic track 28 as illustrated in FIG. 4.
    Operation of the magnetron discharge device
    The arrangement of magnets 25 is therefore configured to generate a magnetic field which will concentrate the electrons in a determined area. In the example described, it is a linear pattern 29, but the magnets could be arranged so as to form any other geometric model, such as a circle or a curve.
    When the electrode 24 is supplied, an electric discharge occurs between the powder bed and the electrode 24, thus generating a plasma.
    The concentration of electrons in a given zone makes it possible to promote local ionization of the gas in the zone, and the presence of a magnetic trap makes it possible to confine the plasma in a precise zone, even at very low pressure.
    Such a device is suitable for low pressure operations, typically around 1 Pa (10 -2 mbar), as more broadly over a range of pressures ranging from microbar (0.1 Pa) to millibar (100 Pa).
    This order of magnitude of pressure (around Pascal) makes it possible to improve the performance of power sources carrying out the fusion of powders.
    More specifically, in the case where the power source 12 includes an electron beam generator, a low operating pressure implies a lower density of the surrounding atmosphere and therefore less impact between the electrons emitted by the source 12 and the surrounding gas.
    The presence of a magnetic field makes it possible to concentrate the electrons in an area and therefore to favor the formation of a plasma despite the low density of the surrounding atmosphere.
    The width of the heated zone is then reduced, which improves the precision of the heating.
    In the case where the power source 12 includes a laser, the reduction in the operating pressure limits the rate of surrounding oxygen, which limits the formation of oxides and fumes.
    The molten material is therefore less polluted by fumes and oxides.
    The phenomenon of stripping, which consists of an exhaustion of the metallic powders in the zone surrounding the solidified track due to the blowing of these powders by a flow of metallic vapor generated by the melting of the powders during heating by laser, is also greatly limited in reducing the surrounding pressure.
    The metal vapors produced during the fusion of the powders are then less dense and the circulation flow of these vapors does not blow the powders.
    The magnetic field B is configured to trap only the electrons, without altering the behavior of the ions.
    In particular, the value of the magnetic field (typically some 100 Gauss = 0.01 Tesla) configured as a function of the mass difference between the electrons and the ions makes it possible to obtain this behavior.
    Indeed, the mass ratio between the electrons and the ions generates a similar relationship between their respective radii of magnetic gyration (Larmor rays).
    The plasma thus created is confined between the electrode 24 and the free surface 21 of the powder bed.
    By placing such a magnetron device 23 with the homogeneous part (plasma or ion beam) towards the powder bed, it is possible to efficiently transfer energy from the species of plasma to the powder and thus to carry out its heating.
    Energy is transmitted to the powder by several means coexisting simultaneously in a plasma. These are charged species, electrons and ions, but also neutral energetic species, in particular the atomized neutral atoms of the electrode (cathode), the nonradiated excited states (metastable), and the photons. As the surface (powder) receives the two charged species, the charge effects (Coulomb repulsion) are reduced or even eliminated.
    In addition, all visible, infrared and ultraviolet photons heat the material when absorbed.
    The denser the plasma, the greater the energy transmitted to the surface.
    The amount of energy, in the case of ions but more generally for any type of plasma, can be easily adjusted by the ion acceleration voltage or respectively the power injected into the plasma. Better control can be achieved by the pulse operation of the plasma, alternating heating phases (active plasma ON) and thermal expansion phases (plasma OFF). Changing the ON / OFF period, also known as the duty cycle, easily allows the temperature to be adjusted.
    Rotating electrode device
    The formation of a plasma between the electrode and the powder bed causes, in the event of prolonged activation, significant heating of the electrode.
    In some embodiments, the electrode 24 is a hollow cylindrical roller inside which is arranged the arrangement 25 of magnets, as illustrated in FIG. 6.
    The arrangement of magnets 25 is mounted fixed relative to the magnetron device 23, the electrode 24 being rotatably mounted along the axis along which it extends.
    Thus, the position and orientation of the magnetic field relative to the magnetron device 23 does not change during operation, making it possible to control the area of plasma formation.
    During the operation of the magnetron device 23, the electrode 24 is rotated. In this way, the part of the electrode 24 which is exposed to the plasma changes regularly, limiting the heating of a particular area, the plasma being always confined to the level of the magnetic trap generated by the arrangement of magnets 25 which has a fixed orientation relative to the magnetron device 23, in particular towards the surface 21 of the powder bed, as illustrated in FIG. 6.
    Linear ion source device
    Variants of magnetron cathodes also make it possible to obtain a linear and homogeneous plasma.
    In the case of the embodiment of Figure 3, the electrode 24 is a planar electrode.
    In a variant illustrated in Figure 7, the magnetron device may include an electrode 24 in which a slot 30 is formed.
    The slot 30 is formed facing the track 28, the track 28 being formed by a cavity extending between the rows of the arrangement of magnets 25.
    An injection orifice 31 is formed in a wall of the carriage 27, at the bottom of the cavity formed by the track 28 and the slot 30.
    A gas is injected into the cavity through the injection orifice 31. During the excitation of the cathode 24, the gas is then strongly ionized by the electrons effectively trapped by the magnetic field B generated by the arrangement of magnets 25.
    Optionally, the gas injected through the injection orifice 31 is the gas making up the working atmosphere, making it possible to simplify the device.
    The cavity formed by the track 28 and the slot 30 therefore forms a source of ions.
    The magnetic barrier generated by the arrangement of magnets 25 increases the electrical resistance of the plasma, thus generating a potential difference in the plasma by Hall effect.
    A charge movement generated by the magnetic field B and an electric field generated by the excitation of the cathode 24 causes a flow of electrons along the track 28, facing the slot 30, leading to the homogenization of the plasma.
    The ions, not magnetized, are projected by the electric field through the slot 30.
    Some lighter electrons follow the ions. Thus, a confined flow of plasma is generated and projected by the slot 30. The slot 30 is ideally located opposite the powder bed, so as to project the plasma jet on the surface 21 to be heated.
    Alternatively, the plasma generation device 20 is of any form other than linear and is adapted to be moved with a robot.
    By placing the plasma generation device 20 in front of the powder surface 21, it is possible to maintain a high density plasma, homogeneous and confined between said device 20 and the powder bed, despite the low working pressure.
    By moving this plasma generation device 20 it is possible to scan the surface 21 of the powder bed. By keeping the plasma on and performing a complete scan of the surface 21 of the powder bed, thus superficially heating the powder bed.
    Optionally, depending on the duration of ignition of the plasma (time ti, t2 or ta) and the position of the plasma generation device 20 above the powder bed, only certain zones can be heated, over the entire width of the powder bed, as illustrated in FIG. 8.
    By limiting the duration of plasma ignition, energy consumption can be optimized while achieving the desired heating.
    Energy is thus efficiently transferred to the powder, which enables it to be heated.
    权利要求:
    Claims (13)
    [1" id="c-fr-0001]
    1. Device for heating a powder bed in an additive manufacturing device, characterized in that it comprises:
    - a plasma generation device (20), said device being adapted to be placed and moved above the powder bed, at a distance from the powder bed allowing the generation of the plasma thereon,
    - a unit for the electrical supply (22) of said plasma generation device,
    - A control unit (9) for controlling the supply and movement of the plasma generation device, and in that the plasma generation device (20) comprises a magnetic plasma confinement assembly.
    [2" id="c-fr-0002]
    2. Heating device according to claim 1, in which the plasma confinement assembly comprises a magnetron type device (23) adapted to confine charged particles.
    [3" id="c-fr-0003]
    3. Heating device according to claim 2, wherein the magnetron device (23) comprises an arrangement of magnets (25) configured to confine electrons in a linear pattern (29).
    [4" id="c-fr-0004]
    4. Heating device according to claim 3, in which the magnetron type device (23) comprises a slot (30) forming an ion source, the slot (30) being formed through the electrode (24) and opening out look from the powder bed.
    [5" id="c-fr-0005]
    5. Heating device according to claim 4, in which a gas is injected into the slot (30).
    [6" id="c-fr-0006]
    6. Heating device according to one of the preceding claims, wherein the plasma generation device (20) is adapted to be moved with a main component of displacement perpendicular to the direction in which it extends.
    [7" id="c-fr-0007]
    7. Heating device according to one of the preceding claims, in which the unit (22) for the electrical supply of said plasma generation device (20) comprises a source of high direct voltage and / or radio frequency and / or pulse .
    [8" id="c-fr-0008]
    8. Apparatus for manufacturing a three-dimensional object by selective additive manufacturing comprising in an enclosure:
    - a support (3) for depositing successive layers of additive manufacturing powder,
    a distribution arrangement (4) suitable for applying a layer of powder on said support (3) or on a previously consolidated layer,
    - at least one power source (8) suitable for the selective consolidation of a layer of powder applied by the distribution arrangement (4), characterized in that it comprises a heating device (19) according to one of the preceding claims, the plasma generation device (20) of the heating device (19) being adapted to be placed and moved above the powder bed, at a distance from the powder bed allowing the generation of the plasma thereon. ci, the plasma generation device (20) further comprising a magnetic plasma confinement assembly.
    [9" id="c-fr-0009]
    9. Apparatus according to claim 8, wherein the dispensing arrangement (4) comprises a squeegee (5) or a layering roller, the plasma generation device (20) extending near said squeegee ( 5) or roller and being movable therewith or moving independently.
    [10" id="c-fr-0010]
    10. Method for manufacturing a three-dimensional object by selective additive manufacturing, said method comprising the steps:
    • Deposition of a layer of powder on a support (3) or a previously solidified layer, • Consolidation of at least one zone of the previously deposited layer, the consolidation being carried out by means of a power source (8), the method being characterized in that it further comprises an operation of heating at least one localized zone of the powder layer by means of a heating device (19) according to one of claims 1 to 7, the heating of the powder bed being carried out by a confined plasma.
    [11" id="c-fr-0011]
    11. The method of claim 10, wherein during the heating step, the plasma generation device (20) confines the charged particles in a precise location, so as to control the formation of electric discharges during the supply to the electrode (24), generating a confined plasma so as to maximize the heat transfer between the plasma and the powder bed.
    [12" id="c-fr-0012]
    12. Method according to one of claims 10 and 11, wherein during the heating step, a gas is injected into the plasma generation device (20) to be ionized there, the magnetic field inducing a projection of the gas ionized so as to generate a confined plasma jet, directed towards the powder.
    [13" id="c-fr-0013]
    13. Method according to one of claims 10 to 12, wherein at least one heating step is carried out before and / or after the consolidation step.
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    同族专利:
    公开号 | 公开日
    FR3079775B1|2021-11-26|
    EP3774132A1|2021-02-17|
    WO2019193299A1|2019-10-10|
    US20210086286A1|2021-03-25|
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    JP2021520310A|2021-08-19|
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    FR3105036A1|2019-12-19|2021-06-25|Addup|IN SITU treatment of powders for additive manufacturing|
    法律状态:
    2019-04-18| PLFP| Fee payment|Year of fee payment: 2 |
    2019-10-11| PLSC| Publication of the preliminary search report|Effective date: 20191011 |
    2020-04-20| PLFP| Fee payment|Year of fee payment: 3 |
    2021-04-23| PLFP| Fee payment|Year of fee payment: 4 |
    2021-09-17| TQ| Partial transmission of property|Owner name: UNIVERSITE PARIS-SACLAY, FR Effective date: 20210812 Owner name: CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE (, FR Effective date: 20210812 Owner name: ADDUP, FR Effective date: 20210812 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1853031|2018-04-06|
    FR1853031A|FR3079775B1|2018-04-06|2018-04-06|MAGNETIC CONTAINER HEATING DEVICE FOR SELECTIVE ADDITIVE MANUFACTURING APPLIANCE|FR1853031A| FR3079775B1|2018-04-06|2018-04-06|MAGNETIC CONTAINER HEATING DEVICE FOR SELECTIVE ADDITIVE MANUFACTURING APPLIANCE|
    US17/045,710| US20210086286A1|2018-04-06|2019-04-05|Magnetic confinement heating device for selective additive manufacturing apparatus|
    CN201980036631.XA| CN112823071A|2018-04-06|2019-04-05|Magnetic confinement heating device for selective additive manufacturing device|
    JP2021503214A| JP2021520310A|2018-04-06|2019-04-05|Magnetic confinement heating device for selective additive manufacturing equipment|
    PCT/FR2019/050809| WO2019193299A1|2018-04-06|2019-04-05|Magnetic confinement heating device for selective additive manufacturing apparatus|
    KR1020207031706A| KR20210112236A|2018-04-06|2019-04-05|Self-sealing heating device for selective additive manufacturing|
    EP19720981.0A| EP3774132A1|2018-04-06|2019-04-05|Magnetic confinement heating device for selective additive manufacturing apparatus|
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