• 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:
    According to the invention, before producing the first layer: - the construction platform (3) is covered with a support sheet (9) capable of being urged against it, forming a rigid and fixed receiving surface successive layers capable of retaining thereon the successive layers formed; and - said support sheet (9) is urged against said construction platform (3) - the green part (10) is formed by the technique of additive processes; and - once the green part (10) thus formed, the stress is removed in order to detach from said platform (3) said support sheet (9) on which the green part (10) is located with the part of the photocurable composition which has not been cured; - said portion of uncured photocurable composition is removed; and - said green part is unhooked from said support sheet (9).
    公开号:FR3068910A1
    申请号:FR1756694
    申请日:2017-07-13
    公开日:2019-01-18
    发明作者:Christophe Chaput；Richard GAIGNON
    申请人:3DCeram SAS；
    IPC主号:
    专利说明:

    PROCESS AND MACHINE FOR MANUFACTURING RAW PARTS OF CERAMIC AND / OR METALLIC MATERIAL BY THE METHOD OF ADDITIVE PROCESSES
    The present invention relates to a method and a machine for manufacturing green parts by additive methods, such green parts being intended to be subjected to cleaning, debinding and sintering operations in order to obtain finished ceramic and / or metal parts.
    The technique of additive processes, also called stereolithography, generally comprises the following stages, for obtaining these raw parts:
    - we build, by computer-aided design, a computer model of the part to be manufactured, a model whose dimensions are slightly larger than those
    of the room to manufacture in order to plan a withdrawal of ceramic material or metallic to Classes of the manufacturing of the room ; and we make the piece by technique of the processes
    additives, technique according to which:
    - A first layer of a photocurable composition is formed on a rigid support comprising at least one ceramic or metallic material, at least one photocurable monomer and / or oligomer, at least one photoinitiator and if necessary at least one plasticizer and / or at least one solvent and / or at least one dispersant;
    - The first layer of the photocurable composition is hardened by irradiation (by laser scanning of the free surface of said layer or by diode projection system) according to a pattern defined from the model for said layer, forming a first stage;
    - A second layer of the photocurable composition is formed on the first stage;
    - The second layer of the photocurable composition is made to harden, by irradiation according to a pattern defined for said layer, forming a second stage, this irradiation being carried out as for the first layer;
    - optionally, the above steps are repeated to obtain the part in the raw state.
    Then, as indicated above, to obtain the finished part, the part is cleaned in the raw state to remove the uncured composition; the part is cleaned in the cleaned raw state; and the part is sintered in the raw state, cleaned and unbound to obtain the finished part.
    The part can be manufactured by a pasty route or by a liquid route.
    • In a pasty production, the photocurable composition is in the form of a paste whose viscosity can vary in particular from 1 Pa. S to infinity for a zero shear rate, and the rigid support is a flat working form supporting the different layers of the part under construction as well as the dough and each of the layers is generally formed by lowering the working platform and spreading a predefined thickness of dough. A reserve of dough is stored in reservoirs which are automatically emptied of a predefined quantity of dough at each layer using a piston. This creates a bead of dough to be spread on the upper layer of the workpiece which has been previously lowered by the working platform. Each layer is generally spread by scraping by a scraping blade which scans the working surface of the working platform, for example by advancing in a rectilinear horizontal direction.
    • In liquid manufacturing, the photocurable composition is in the form of a suspension of low viscosity.
    In a first embodiment by the liquid route, the rigid support is a platform which is made to descend photocurable in a bath of the suspension in order to cover it with a layer of said suspension, which layer is then made harden by irradiation as indicated above. On this first layer, each of the other layers is then successively formed by lowering the platform step by step into the bath so that the upper stage of the part being formed is lowered below the free surface of the suspension. photocurable for the formation of the layer in question, which is then irradiated.
    In a second embodiment by the liquid route, the photocurable suspension is contained in a tank with a transparent bottom for irradiation, and the part is held on a rigid support which is a platform which is raised step by step. Thus, we start by hardening a base layer, then the platform is raised by one step to allow the suspension to form a new layer which is then hardened, the operation being repeated with each layer.
    In a third embodiment by the liquid route, the photocurable suspension is spread in a layer on a transparent film for irradiation, the film being able to take place horizontally. The part is formed on a rigid platform which descends to come into contact with the layer which is hardened by irradiation through the film. A new segment of film is then unwound coated with a new photocurable layer and the operation is repeated until the end of the construction of the part.
    It is important that there is a good connection between the construction surface, in other words the rigid working platform (upper face of the working platform in the case of the pasty track and of the above-mentioned first embodiment, respectively. liquid track, and underside of the platform in the case of the second and third embodiments mentioned above track and the part which is constructed by stacking the layers.
    must
    To favor the clamping of the construction of the part, the part under construction on it the rigid platform is as rigid as possible. In the event of incorrect clamping, the part may move during its construction. Such a risk is significant, in particular when a scraping system is used to stack the layers (pasty route), all the more so since the pastes used have a high viscosity and the spread layers are thin. These parameters combined lead to exerting significant constraints during the passage of the scraper. Thus, a part that moves during its construction will be poorly constructed or will not meet the desired geometric tolerances.
    Furthermore, once the part has been built, you must be able to remove it from the rigid platform without damaging it. During this removal step, it is necessary to apply a constraint on the part to detach it. The operator will then have to use a tool such as a spatula which risks damaging the part because he will have to deform the part in order to twist it to unhook it.
    To solve this clamping problem in order to improve the quality of the parts and the reliability of their manufacture by additive processes, the Applicant Company sought a solution providing a significant clamping force, maintained throughout the stacking of the layers , and allowing removal of the part without damaging it, and without requiring complicated operations of mounting or preparation of the rigid support.
    Recall that the clamping force must be such that any movement of the part during its manufacture must be prevented, such a movement resulting in an impossibility of meeting the tolerances, a surface condition of the raw part of poor quality due to poor overlapping of layers and rupture of parts after direct contact with the scraper.
    According to the invention, provision is made to place, on the rigid platform, a support sheet, which will be clamped, that is to say rigorously fixed, by biasing on the rigid platform, said support sheet being chosen from a material capable, once the green part is finished, of being deformed by constraint, in order to allow it to take off, the stress having been removed.
    The present invention therefore firstly relates to a process for the manufacture, by the technique of additive processes, of a green part made of at least one material chosen from ceramic materials and metallic materials, a process according to which layers based on a photocurable composition comprising said at least one ceramic and metallic material in powder form and an organic part comprising at least one photocurable monomer and / or oligomer and at least one photoinitiator are successively caused to cure by irradiation according to a pattern defined for each layer, the first layer being formed on a construction platform, and each other layer being formed then caused to harden on the previous layer, characterized in that:
    - before making the first layer:
    - We cover the construction platform with a support sheet capable of being urged against it by forming a rigid and fixed surface for receiving successive layers capable of retaining thereon the successive layers formed; and - said support sheet is pressed against said construction platform;
    forming the room flood by technique processes additives ; and Once the room thus formed, delete the solicitation to of detach from said platform
    said support sheet on which the green part is located with the part of the photocurable composition which has not been hardened;
    removing said portion of uncured photocurable composition; and unhooking said green part from said support sheet.
    The ceramic materials are the powdery sinterable ceramic materials chosen in particular from alumina (AI2O3), by alumina, hydroxyapatite, zirconia (Zr 2 ), zircon (ZrSiO 4 ), zircon silica zirconia reinforced silica (SiO 2 ), (ZrSiO 4 + SiO 2 ), silicon nitride, tricalcium phosphate (TCP), aluminum nitride, silicon carbide, cordierite and mullite.
    The metallic materials are the powdery sinterable metallic materials chosen from pure metals, such as Al, Cu, Mg, Si, Ti, Zn, Sn, Ni their alloys and mixtures of pure metals and their alloys.
    In a particularly preferred manner, it is possible to choose a deformable support sheet to allow, once the stress is removed, to unhook the green part from its support sheet by applying a stress to said support sheet so as to deform it in the purpose of releasing the green part.
    According to particular embodiments of the method according to the present invention, a photocurable composition of pasty consistency can be used, which is spread layer after layer on the construction platform, the layers being irradiated from above, or it is possible to use a photocurable composition in suspension, the platform being lowered step by step into the suspension to form the successive layers irradiated from above, or the platform being disposed at a distance corresponding to the thickness of a layer of the bottom d '' a photocurable composition tank with transparent bottom for irradiation and reassembled at each layer formation, the layers being each time irradiated from below; or the platform coming at each layer formation in contact with a suspension layer applied to a segment of a transparent film which is made to unwind horizontally to present a new segment at each layer formation, the layers being each times irradiated from below.
    According to a first particular embodiment of the method according to the present invention, the suction support is carried out on said support sheet against said construction platform.
    According to a first variant of this first embodiment, a flat perforated or porous plate made of a rigid material, such as ceramic, metallic or plastic, is used as construction platform, the free face of which is covered by the sheet. support and which is connected, by its opposite face, to a vacuum pump or to a vacuum generator, which one or which is put into service to press the support sheet on the free face of the platform forming the rigid and fixed surface for receiving successive layers of photocurable composition, and put out of service to detach said support sheet from said platform.
    In particular, one can use a perforated plate whose perforations are in particular in the form of holes and / or slots connected to the vacuum pump or the vacuum generator, arranged to ensure when
    this one or this one is working the plating of the leaf of support.The holes and / or slots are of any form and
    can advantageously be sized and / or arranged to ensure good plating of the support sheet, ensuring an increase in the vacuum in certain places if desired.
    Mention may be made, by way of example, of holes 0.01-5 mm in diameter, spaced apart from or slits with a width spaced apart
    0.1-50 mm.
    The holes are not necessarily circular and are not necessarily arranged in the form of a grid and the slots are not necessarily of constant width over their entire height.
    first
    According to a second variant of this embodiment, a receptacle, in particular of metal or plastic, of flat shape, the bottom of which has perforations connected to a vacuum pump and which receives a grid, in particular of metal, the support sheet coming to be applied on the free edge of the receptacle and on the grid, said vacuum pump being put into service to press said support sheet on the free edge of the receptacle and on the grid in forming the rigid and fixed surface for receiving the successive layers of photocurable composition, and decommissioned to detach said support sheet from said platform.
    In this first embodiment of the present invention:
    - one can use a support sheet (9) having a thickness of 0.05 - 5 mm; in any case, a sheet thickness is chosen which does not prevent its deformation;
    - a support sheet (9) made of poly (vinyl chloride) or polyvinyl alcohol can be used;
    - a vacuum of 13.33 Pa - 10 ~ 10 Pa (0.133 mbar-10 -12 mbar) can be generated.
    In accordance with a second particular embodiment of the method of the present invention, said support sheet, which is made of ferromagnetic material, is produced by magnetic attraction on the construction platform, which is capable of generating a flow controllable magnetic, said magnetic flux being activated to press said support sheet on said platform, and deactivated to detach said support sheet from said platform.
    According to a first variant of this second embodiment, a magnetic plate with permanent magnets can be activated or deactivated mechanically as a platform.
    According to a second variant of this second embodiment, an electromagnetic plate with coil (s) is used as the platform, the magnetic flux being activated when a direct current is sent into the coil (s), and deactivated when none current flows through the coil (s).
    The present invention has also for object a machine of manufacturing by technical of the processes additives of raw parts of a chosen material among the
    ceramic materials and metallic materials, in which layers based on a photocurable composition comprising said at least one ceramic and metallic material in powder form and an organic part comprising at least one monomer and / or a photocurable oligomer and at least one photoinitiator are successively hardened by irradiation according to a pattern defined for each layer, the first layer being formed on a construction platform, and each other layer being formed then caused to harden on the previous layer, said machine also comprising means for irradiating successive layers, characterized in that the machine includes means for biasing against said platform for the construction of a support sheet intended to cover it before the first layer is produced, by forming a rigid surface and fixed for receiving successive layers, suitable for retaining on the latter the successive layers formed, said biasing means being able to be deactivated to detach from said platform said support sheet on which the green part is located with the part of the photocurable composition which has not been hardened.
    In a particularly preferred manner, the support sheet can be chosen to be deformable to allow, once the stress is removed, to unhook the green part from its support sheet by applying a stress to said support sheet so as to deform it in the purpose of releasing the green part. Mention may be made of a sheet with a thickness of 0.05 to 1 mm. In any case, a sheet thickness is chosen which does not prevent its deformation.
    The machine according to the present invention can have the following particular characteristics:
    - It is intended for the formation of raw parts from a photocurable composition in the form of a paste and it includes means for scraping the paste to spread the successive layers on the construction platform, above which the support sheet is placed, the irradiation means being placed above it; or
    it is intended for the formation of green parts from a photocurable composition in the form of a suspension and
    - It comprises a tank to be filled with said suspension, in which the construction platform on which the support sheet is placed is capable of descending step by step to form thereon at each step a layer to be irradiated, the means being placed above said platform; or it comprises a tank with a transparent bottom for irradiation, in which the platform under which the support sheet is placed is capable of going up step by step to form at each step between the bottom and said support sheet a layer with irradiating, the irradiation means being placed below said bottom of the tank; or it comprises a device making it possible to horizontally unwind a transparent sheet for irradiation by forming successive sheet segments receiving at each layer of photocurable composition, once the construction platform under which the support sheet is placed being able to descend onto the layer to be irradiated, being each time on a segment of transparent sheet, the irradiation means being placed below said transparent sheet.
    In accordance with a first particular embodiment of the machine according to the present invention, the biasing means are suction clamping means, consisting in particular of a vacuum pump, such as a vane pump, a membrane pump, a piston pump (s), or a vacuum generator such as a Venturi effect generator, said suction means being in particular capable of generating a vacuum of 13.33 Pa - 1O ~ 10 Pa (0.133 mbar-10 ~ 12 mbar).
    According to a first variant of this first embodiment of the machine according to the invention, the construction platform is a perforated or porous flat plate made of a rigid material, such as ceramic, metallic or plastic, the face of which is covered. free by the support sheet and which is connected, by its opposite face, to a vacuum pump or to a vacuum generator, which one or which is put into service to press the support sheet on the free face of the platform by forming the rigid and fixed surface for receiving successive layers of photocurable composition, and put out of service to detach said support sheet from said platform.
    In particular, the construction platform can be a perforated plate whose perforations are in particular in the form of holes and / or slots connected to the vacuum pump or the vacuum generator, arranged to ensure when the latter or this one is running on
    plating of the leaf of support. Consistent at a second variant of this first fashion of the machine according to
    the invention, the construction platform is a receptacle, in particular of metal or plastic, of flat shape, the bottom of which has perforations connected to a vacuum pump and which receives a grid, in particular of metal, the sheet of support coming to be applied on the free edge of the receptacle and on the grid, said vacuum pump being put into service to press said support sheet on the free edge of the receptacle and on the grid by forming the rigid and fixed surface for receiving successive layers of photocurable composition, and decommissioned to detach said support sheet from said platform.
    In this first embodiment of the machine according to the present invention:
    - the support sheet may have a thickness of 0.05 5 mm; in any case, a sheet thickness is chosen which does not prevent its deformation;
    the support sheet may be a poly (polyvinyl chloride) sheet, the latter being soluble in water.
    According to a second embodiment of the machine according to the present invention, the biasing means are means ensuring a magnetic attraction of said support sheet, which is made of a ferro-magnetic material, on the construction platform, which is capable of generating a controllable magnetic f lux, said magnetic flux being activated to press said support sheet on said platform, and deactivated to detach said support sheet from said platform.
    In a first variant of this second embodiment, the construction platform is a magnetic plate with permanent magnets that can be activated or deactivated mechanically.
    In a second variant of this second embodiment, the construction platform is an electromagnetic plate with coil (s), the magnetic flux being activated when a direct current is sent into the coil (s), and deactivated when none current flows through the coil (s).
    To better illustrate the object of the present invention, there will be described below, by way of indication and not limitation, particular embodiments with reference to the accompanying drawing.
    On this drawing :
    Figure 1 is a schematic perspective view machine according to the invention for the manufacture by pasty of a raw piece of ceramic material, comprising a construction platform produced in accordance with a first embodiment, the support sheet having has been omitted from this figure;
    the Figure 2 is, see you large scale one view in exploded perspective of the platform of construction and of the sheet of support equipping the machine of the
    Figure 1 ;
    - Figures 3 and 4 are perspective views of a construction platform produced according to variants of that of Figures 1 and 2;
    - The Figure is, on a larger scale, a schematic sectional view of a part being formed on the construction platform of the machine of the
    Figure 1, said cut being made in the direction of scraping;
    - Figures 6 to 11 illustrate the construction of a part with the machine of Figure
    - Figures 12 to 14 are schematic views similar to the Figure of a channel manufacturing machine
    liquid of a raw piece in material ceramic through the technique of processes additives, with some means irradiation respectively speak on it for the machine Figure 12 and speak below for the machines of Figures 13 and 14 r
    - Figure 15 is a schematic sectional view of a construction platform covered with the support sheet, the construction platform being produced in accordance with a variant of the preceding Figures;
    - Figure 16 is a top view of the platform of Figure 15 with the support sheet, the latter being shown with partial cutaway;
    - Figures 17a and 17b are schematic sectional views of a construction platform produced in accordance with a first variant of a second embodiment of the present invention, in the respective positions of application and detachment of the support sheet with respect to said platform; and
    - Figures 18a and 18b are views corresponding to Figures 17a and 17b respectively of a second variant of this second embodiment.
    Referring to Figure 1, it can be seen that there is shown schematically a device 1 for scraping a layer of dough 2 on a working surface of a construction platform 3 of a machine for making raw bodies of ceramic material by the technique of additive processes. The scraper device 1, slidably mounted on the frame 4 of the machine, comprises a gantry 5 carrying at the front a scraper blade 6 having a horizontal scraper edge.
    The construction platform 3 comprises a matrix of through holes 3a regularly arranged. According to variants shown in Figures 3 and 4, the holes 3a are replaced by slots 3b parallel to an edge of the work plate (Figure 3), or slots 3c arranged to form a grid (Figure
    4).
    On the face
    1, the galvanometric head 7 which directs the laser beam has also been shown, as well as a suction system whose role will be described below.
    In the Figure we can see the support sheet whose role is indicated below as well as the object being manufactured.
    machine
    We will now describe the operation of the
    Figure 1 with reference to Figures 6 to 11
    Figure 6
    At the start of production, the construction platform is put under vacuum by putting the suction system into operation in order to suck up and clamp the sheet 9 which will serve as a construction support.
    Figure 7
    The suction is maintained throughout the printing in order to provide a fixed and rigid base to the printed part 10.
    Figure 8
    After printing, the vacuum is broken.
    Figure 9
    The sheet 9 supporting the part 10 is easily separated from the work plate 3.
    Figure 10
    The uncured paste 2a around the part 10 is removed. Part 10 is still on the backing sheet
    9.
    Figure it
    The sheet 9 is deformed in order to unhook the part 10 without damaging it.
    EXAMPLE
    A raw piece of ceramic material was made using the machine of Figure 1.
    A construction platform 3 was used, pierced with a matrix of holes 3a 1 mm in diameter and spaced apart by 7 mm. A sheet of poly (vinyl chloride) 9 100 μm thick was placed on this work plate 3 in order to be vacuumed, a vacuum of 1 mbar (10OPa) having been generated for this purpose using '' a vane pump
    8.
    Once the green part 10 was finished, the vacuum was cut off. The part 10 was cleaned in order to remove the uncured paste 2a therefrom. The part 10 was then easily detached from the support sheet 9.
    If one refers to Figures 12 to 14, it can be seen that a machine has been shown schematically for the manufacture of raw ceramic pieces by liquid means, with irradiation respectively from above, from below, and from below. .
    The machine of Figure 12 comprises a tank il in which is the photocurable suspension. A perforated horizontal platform 3 ′ pierced with holes 3 ′ a is mounted to descend step by step into the tank il so as to be covered each time for a layer of photocurable suspension, which will be irradiated by the irradiation means 7 According to the invention, a support sheet 9 is placed on the platform 3 'and sucked against the latter by the suction system 8, as described above with reference to FIG. 1.
    The machine of Figure 13 has a tank 12 with a transparent bottom for irradiation. This reservoir 12 will be filled with the photocurable suspension. A horizontal platform 3 pierced with holes 3a is mounted capable of being placed in the reservoir 12 parallel to its bottom and at a distance from it corresponding to the thickness of the first layer to be formed on said platform 3 which constitutes the rigid support for the construction of the part, the irradiation being carried out by the means 7 placed under said bottom. According to the invention, a support sheet 9 is pressed by suction by the suction system 8 under said platform 3, which, after formation of the first layer, is raised step by step in the reservoir 12 for the formation of each of the other layers.
    The machine of FIG. 14 comprises a film 13 transparent to irradiation which unwinds from a coil 14 to be wound on a coil 15. Whenever a layer has to be formed, the segment 13a of the film 13 enters the coils 14 and 15 is coated with a layer of photocurable suspension, then the platform assembly 3 '' 'and support sheet 9 - of the same type as the platform assembly 3 and support sheet 9 in Figure 13 is lowered to come into contact with the applied suspension layer, which is caused to cure by irradiation from below through the transparent film. The platform assembly 3 '' 'and its support sheet 9 is then reassembled to allow the application of a new layer of suspension applied to the next segment of the film that has been unwound. The operation is repeated until the desired green part is obtained.
    Referring to Figures 15 and 16, it can be seen that there is shown a construction platform produced according to a variant. This platform consists of a receptacle 3A, with a flat bottom, for example metallic, in which a grid, for example metallic 3B, is disposed, flush with the peripheral free edge of the receptacle 3A. The bottom of the receptacle 3A has holes 3C connected to the vacuum pump 8. The grid 3B makes it possible to distribute the vacuum and the receptacle 3A forms a frame ensuring rigidity when the support sheet 9 is applied to its peripheral rim and on grid 3B.
    It would be possible for the grid 3B to be situated slightly above the rim of the receptacle 3A, but it cannot be envisaged that it protrudes from the said rim of the receptacle 3A.
    If we refer to Figures 17a and 17b, we can see that there is shown schematically in section a platform 30 which consists of a magnetic plate with permanent magnets that can be activated (Figure 17a) and deactivate (Figure 17b) mechanically by translation along the arrow f. During activation, the support sheet, here made of ferro-magnetic material, is applied firmly to the upper face of the platform 30, and during deactivation, the support sheet 9 detaches from the platform 30. This technology is developed by the Braillon Company (http://www.braillon.com/français/nostechnologies.html)
    If we refer to Figures 18a and 18b, we can see that there is shown schematically in section a platform 30 'with coils 31, on which is applied the support sheet 9. This technology is also offered by the Braillon Company.
    A magnetic field is generated by the excitation of the coils 31 by direct current, the support sheet 9 being maintained (Figure 18a). When no current flows through the coils 31, the support sheet 9 is detached.
    权利要求:
    Claims (10)
    [1" id="c-fr-0001]
    1 - Method for manufacturing, by the technique of additive methods, a green part (10) in at least one material chosen from ceramic materials and metallic materials, method according to which layers based on a photocurable composition comprising said or said ceramic and metallic materials in the pulverulent state and an organic part comprising at least one monomer and / or a photocurable oligomer and at least one photoinitiator are successively cured by irradiation according to a pattern defined for each layer, the first layer being formed on a construction platform, and each other layer being formed then caused to harden on the previous layer, characterized in that:
    - before making the first layer:
    - the construction platform is covered (3; 3 ';
    3; 3 '; 3A-3B; 30 ; 30 ') of a support sheet (9) capable of being urged against the latter by forming a rigid and fixed surface for receiving the successive layers capable of retaining thereon the successive layers formed; and - said support sheet (9) is pressed against said construction platform (3; 3 '; 3;
    3 '; 3A-3B; 30 ; 30') ;
    - The green part (10) is formed by the technique of additive processes; and
    - once the green part (10) thus formed, the stress is removed in order to detach from said platform (3; 3 '; 3; 3'; 3A-3B; 30; 30 ') said support sheet (9 ) on which is the green part (10) with the part of the photocurable composition which has not been hardened (2a);
    - Removing said part of uncured photocurable composition (2a); and
    - said raw part (10) is removed from said support sheet (9).
    [2" id="c-fr-0002]
    2 - Method according to claim 1, characterized in that one chooses a support sheet (9) deformable to allow, once the stress removed, to unhook the green part (10) from its support sheet (9) by applying a stress to said support sheet (9) so as to deform it in order to release the green part (10).
    [3" id="c-fr-0003]
    3 - Method according to one of claims 1 and 2, characterized in that one uses a photocurable composition of pasty consistency, which is spread layer after layer on the construction platform, the layers being irradiated from above , or using a photocurable composition in suspension, the platform being lowered step by step into the suspension to form the successive layers irradiated from above, or the platform being arranged at a distance corresponding to the thickness d 'A bottom layer of a tank of photocurable composition with a transparent bottom for irradiation and reassembled at each layer formation, the layers being each time irradiated from below; or the platform coming at each layer formation in contact with a suspension layer applied to a segment of a transparent film which is made to unwind horizontally to present a new segment at each layer formation, the layers being at each time irradiated from below.
    [4" id="c-fr-0004]
    4 - Method according to one of claims 1 to 3, characterized in that one carries out the biasing by suction of said support sheet (9) against said construction platform (3; 3 '; 3; 3 '' ').
    [5" id="c-fr-0005]
    5 - Method according to claim 4, characterized in that one uses, as the construction platform, a perforated flat plate (3; 3 '; 3; 3' '') or porous in a rigid material, such as ceramic, metallic or plastic, the free face of which is covered by the support sheet (9) and which is connected, by its opposite face, to a vacuum pump (8) or to a vacuum generator, which or which is put into service to press the support sheet (9) on the free face of the platform by forming the rigid and fixed surface for receiving the successive layers of photocurable composition, and put out of service to detach the said support sheet (9) of said platform.
    [6" id="c-fr-0006]
    6 - Method according to claim 5, characterized in that one uses a perforated plate whose perforations are in particular in the form of holes (3a; 3b; 3c; 3'a) and / or slots connected to the vacuum pump or vacuum generator, arranged to ensure when the latter or it is running the plating of the support sheet (9).
    [7" id="c-fr-0007]
    7 - Method according to claim 4, characterized in that one uses, as the construction platform, a receptacle (3A), in particular of metal or plastic, of flat shape, the bottom of which has perforations (3C ) connected to a vacuum pump (8) and which receives a grid (3B), in particular made of metal, the support sheet (9) being applied on the free edge of the receptacle (3A) and on the grid (3B) , said vacuum pump
    (8) being setting in service for tackle said leaf of support (9 ) sure the border free from receptacle (3A) and sure Grid (3B) in forming the area rigid and fixed of reception of thelayers clear of composition
    photocurable, and decommissioned to detach said support sheet (9) from said platform (3A-3B).
    [8" id="c-fr-0008]
    8 - Method according to one of claims 4 to 7, characterized in that one uses a support sheet (9) having a thickness of 0.05 - 5 mm.
    [9" id="c-fr-0009]
    9 - Method according to one of claims 4 to 8, characterized in that one uses a support sheet (9) of poly (vinyl chloride) or polyvinyl alcohol.
    10 - Process according to 1 'a of the claims 4 to 9, characterized speak fact that 1 ' we generates a vacuum of 13.33 Pa - 10 ~ 10Pa (0.133 mbar -10 ~ 12mbar ) ·
    11 - Process according to One of claims 1 to 4 characterized by the make that We realize the
    stress by magnetic attraction of said support sheet (9), which is made of a ferro-magnetic material, on the construction platform (30; 30 '), which is capable of generating a controllable magnetic flux, said magnetic flux being activated to press said support sheet (9) on said platform (30; 30 '), and deactivated to detach said support sheet (9) from said platform (30; 30').
    Method according to claim 11, characterized in that a magnetic plate (30) with permanent magnets can be activated or deactivated mechanically as a platform.
    13 - Method according to claim il, characterized in that one uses, as platform, an electromagnetic plate (30 ') to coil (s) (31), the magnetic flux being activated when a direct current is sent into the coil (s) (31), and deactivated when no current flows through the coil (s) (31).
    14 - Machine for the manufacture by the technique of additive processes of raw parts in a material chosen from ceramic materials and metallic materials, according to which layers based on a photocurable composition comprising said ceramic and metallic material (s) in the state pulverulent and an organic part comprising at least one photocurable monomer and / or oligomer and at least one photoinitiator are successively cured by irradiation according to a pattern defined for each layer, the first layer being formed on a construction platform, and each other layer being formed and then caused to harden on the preceding layer, said machine also comprising means for irradiating (7) successive layers, characterized in that the machine comprises means (8) for biasing against said platform. construction (3; 3 '; 3; 3' ''; 3A-3B; 30; 30 ') of a support sheet (9) intended to cover it before the production of the first layer, by forming a rigid and fixed surface for receiving the successive layers, capable of retaining the successive layers formed thereon, said biasing means being able to be deactivated for detach from said platform (3; 3 '; 3; 3 '' '; 3A-3B; 30 ; 30 ') said support sheet (9) on which the green part (10) is located with the part of the photocurable composition which has not been hardened (2a).
    15 - Machine according to claim 14, characterized in that the support sheet (9) is chosen to be deformable to allow, once the stress is removed, to unhook the green part (10) from its support sheet (9) by application of a constraint on said support sheet (9) so as to deform it in order to release the green part (10).
    16 - Machine according to one of claims 14 and
    15, characterized in that:
    - It is intended for the formation of raw parts from a photocurable composition in the form of a paste and it includes scraping means (6) of the paste to spread the successive layers on the construction platform ( 3), above which the support sheet (9) is placed, the irradiation means (7) being placed above it;
    or it is intended for the formation of green parts from a photocurable composition in the form of a suspension and
    - It comprises a tank (il) to be filled with said suspension, in which the construction platform (3 ') on which the support sheet (9) is placed is capable of descending step by step to form thereon at each step a layer to be irradiated, the irradiation means (7) being placed above said platform (3 ');
    or
    - It comprises a tank (12) with a transparent bottom for irradiation, in which the platform (3) under which the support sheet (9) is placed is capable of going up step by step to form at each step between the bottom and said support sheet (9) a layer to be irradiated, the irradiation means (7) being placed below said bottom of the tank (12); or it comprises a device making it possible to horizontally unwind a transparent sheet (13) for irradiation by forming successive sheet segments (13a) receiving each time a layer of photocurable composition, the construction platform (3 ' '') under which the support sheet (9) is placed being able to descend onto the layer to be irradiated, being each time on a segment (13a) of transparent sheet, the irradiation means (7) being placed at- below said transparent sheet (13).
    17 - Machine according to one of claims 14 to 16, characterized in that the biasing means are suction clamping means, consisting in particular of a vacuum pump (8), such as a vane pump, a diaphragm pump, a piston pump (s), or a vacuum generator such as a Venturi effect generator, said suction means being in particular capable of generating a vacuum of 13.33 Pa - 1O ~ 10 Pa ( 0.133 mbar-10 ~ 12 mbar).
    18 - Machine according to claim 17, characterized in that the construction platform is a perforated flat plate (3; 3 '; 3; 3' '') or porous in a rigid material, such as ceramic, metallic or plastic, the free face of which is covered by the support sheet and which is connected, by its opposite face, to a vacuum pump or to a vacuum generator, which or which is put into service to press the sheet of support (9) on the free face of the platform, forming the rigid and fixed surface for receiving successive layers of photocurable composition, and put out of service to detach said support sheet (9) from said platform .
    19 - Machine according to claim 18, characterized in that the construction platform is a perforated plate whose perforations are in particular in the form of holes (3a; 3b; 3c; 3'a) and / or slots connected to the vacuum pump or to the vacuum generator, arranged to ensure when the latter or this is in operation the plating of the support sheet (9).
    20 - Machine according to claim 17, characterized in that the construction platform is a receptacle (3A), in particular of metal or plastic, of flat shape, the bottom of which has perforations (3C) connected to a pump vacuum (8) and which receives a grid (3B), in particular made of metal, the sheet of on the free edge of the
    receptacle (3A) and on the grid (3B), said vacuum pump (8) being setting in service for tackle said leaf of support (9 ) sure the border free of the receptacle (3A) and sure Grid (3B) in forming the rigid surface and fixed of reception of thelayers successive of composition
    out of service to detach said photocurable, and put backing sheet (9) of
    21 - Machine according to one of claims 17 to
    20, characterized in that the support sheet (9) has a thickness of 0.05 - 5 mm.
    22 - Machine according to one of claims 17 to
    21, characterized in that the support sheet (9) is a sheet of poly (vinyl chloride) or of polyvinyl alcohol.
    23 - Machine according to one of claims 14 to 16, characterized in that the biasing means are means ensuring a magnetic attraction of said support sheet (9), which is made of a ferro-magnetic material, on the flat -building form (30; 30 '), which is capable of generating a controllable magnetic flux, said magnetic flux being activated to press said support sheet (9) on said platform (30; 30'), and deactivated for detaching said support sheet (9) from said platform (30;
    30 ' ) .
    24 - Machine according to claim 23,
    5 characterized in that the construction platform is a magnetic plate (30) with permanent magnets which can be activated or deactivated mechanically.
    25 - Machine according to claim 23,
    [10" id="c-fr-0010]
    10 characterized in that the construction platform is an electromagnetic plate (30 ') with coil (s) (31), the magnetic flux being activated when a direct current is sent into the coil (s) (31), and deactivated when no current flows through the coil (s) (31).
    类似技术:
    公开号 | 公开日 | 专利标题
    EP3427924A1|2019-01-16|Method and machine for manufacturing green ceramic and/or metal items using the additive processes technique
    EP2477769B1|2014-12-24|Method of producing an object by laser from at least two different powder metarials and corresponding manufacturing device
    EP2156942B1|2011-03-23|Method for manufacturing a part by selective laser fusion or sintering of powders of different materials
    FR3070134B1|2019-08-16|METHOD AND MACHINE FOR MANUFACTURING AT LEAST ONE PIECE OF AT LEAST ONE CERAMIC AND / OR METALLIC MATERIAL BY THE TECHNIQUE OF ADDITIVE PROCESSES
    CA2189539C|1999-12-14|Stencil for depositing and portioning variously thick spot layers of a viscous material
    EP3369555B1|2019-07-17|Method and machine for manufacturing parts by the technique of additive methods by paste processing with improved paste transport
    EP3377254B1|2021-07-21|Method for manufacturing a blade preform, a blade and a nozzle segment by selective powder-bed fusion
    FR2622877A1|1989-05-12|DEVICE FOR SUPPLYING A CONTINUOUS CARDBOARD SHEET FOR A WAVING MACHINE
    FR2885310A1|2006-11-10|Manufacturing process for hollow turbine blade with recessed tip uses laminated plate brazed inside cast blade tip to form bathtub-shaped recess
    EP2619011A1|2013-07-31|Embossing machine including a platen press
    FR2701425A1|1994-08-19|Printing machine comprising at least one double displacement cylinder.
    FR2658111A1|1991-08-16|CUTTING MACHINE FOR FABRICS OR OTHER SHEET MATERIALS COMPRISING AN ADJUSTABLE END OF STROKE STOP FOR A CUTTING KNIFE.
    FR2967934A1|2012-06-01|TOOL FOR POSITIONING A COATING
    BE1015008A3|2004-08-03|Base plate a gap for uniform coating to carpet.
    FR2710864A1|1995-04-14|Process and installation for the assembly of gasifiable model parts used in foundry.
    FR3070135B1|2019-08-16|METHOD AND MACHINE FOR MANUFACTURING PARTS OF CERAMIC OR METALLIC MATERIAL BY THE TECHNIQUE OF ADDITIVE PROCESSES
    FR2831879A1|2003-05-09|Individualization device for removing disc shaped blanks comprises two parallel vacuum grippers controlled so that one gripper sucks blank to raised position whilst second gripper supports blank on opposite side
    EP1098559B1|2007-02-07|Transport and holding device for panels
    FR2583332A1|1986-12-19|Method and device for cutting out a product made of superposed sheets
    EP3820265A1|2021-05-12|Method and device for cutting a radial electronic component
    EP0565434B1|1999-09-08|Method and device for the manufacturing of license plates, in particular reflective plates
    EP0442239B1|1994-03-02|Machine for unstacking sheet material, more particularly glass sheets with polished, chamfered or rounded edges
    EP3802130A1|2021-04-14|Method for preparing the upper surface of an additive manufacturing platen by depositing a bed of powder
    FR2677327A1|1992-12-11|Method for automatically detaching a protective paper covering an adhesive sheet and installation for implementing this method
    EP0658087B1|1997-01-08|Installation for cutting sheet material
    同族专利:
    公开号 | 公开日
    CN109249513A|2019-01-22|
    RU2688697C1|2019-05-22|
    FR3068910B1|2019-08-16|
    KR20190008130A|2019-01-23|
    US20190015899A1|2019-01-17|
    JP2019031075A|2019-02-28|
    UA120671C2|2020-01-10|
    EP3427924A1|2019-01-16|
    KR102075699B1|2020-02-10|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2010049696A2|2008-10-30|2010-05-06|Mtt Technologies Limited|Additive manufacturing apparatus and method|
    WO2011082298A2|2009-12-30|2011-07-07|Rolls-Royce Corporation|Systems and methods for filtering molten metal|
    US20150145174A1|2013-11-22|2015-05-28|Stratasys, Inc.|Magnetic platen assembly for additive manufacturing system|
    US20160047980A1|2014-08-18|2016-02-18|Hrl Laboratories, Llc|Stacked microlattice materials and fabrication processes|
    US20160176118A1|2014-12-17|2016-06-23|Arevo Inc.|Heated build platform and system for three dimensional printing methods|
    JP2000211031A|1999-01-26|2000-08-02|Ntt Data Cmet Kk|Support table of photofabrication apparatus|
    WO2012106256A1|2011-01-31|2012-08-09|Global Filtration Systems|Method and apparatus for making three-dimensional objects from multiple solidifiable materials|
    ES2705242T3|2012-09-05|2019-03-22|Aprecia Pharmaceuticals LLC|Three-dimensional printing system and equipment set|
    JP6515557B2|2015-02-04|2019-05-22|セイコーエプソン株式会社|Member for manufacturing three-dimensional object, apparatus for manufacturing three-dimensional object, method for manufacturing three-dimensional object, and three-dimensional object|
    WO2016184997A1|2015-05-19|2016-11-24|Addifab Aps|Additive manufacturing apparatus with recoat unit and process using the same|
    DE102015213103A1|2015-07-13|2017-01-19|Eos Gmbh Electro Optical Systems|Method and device for producing a three-dimensional object|
    CN108025496A|2015-09-16|2018-05-11|应用材料公司|The alternative support workbench opened for increasing material manufacturing|
    US20200238615A1|2015-09-25|2020-07-30|Addifab Aps|Additive manufacturing device and system, modular build platform and build platform unit|
    EP3352972B1|2015-09-25|2021-10-27|Carbon, Inc.|Build plate assemblies for continuous liquid interphase printing having lighting panels and related methods and devices|
    CA3024147A1|2016-05-31|2017-12-07|Northwestern University|Method for the fabrication of three-dimensional objects and apparatus for same|US10668709B2|2014-08-12|2020-06-02|Carbon, Inc.|Three-dimensional printing using carriers with release mechanisms|
    CN109702853B|2019-01-24|2020-05-01|青岛大学|3D printing method of magnetic ceramic and magnetic ceramic prepared by method|
    US11144034B2|2019-01-30|2021-10-12|General Electric Company|Additive manufacturing systems and methods of generating CAD models for additively printing on workpieces|
    US20200238448A1|2019-01-30|2020-07-30|General Electric Company|Tooling Assembly for Magnetically Aligning Components in an Additive Manufacturing Machine|
    US11173574B2|2019-01-30|2021-11-16|General Electric Company|Workpiece-assembly and additive manufacturing systems and methods of additively printing on workpieces|
    US11198182B2|2019-01-30|2021-12-14|General Electric Company|Additive manufacturing systems and methods of additively printing on workpieces|
    FR3098438B1|2019-07-08|2021-06-11|S A S 3Dceram Sinto|PASTE LAYER APPLICATION DEVICE FOR AN APPARATUS FOR MANUFACTURING CERAMIC PARTS BY STEREOLITHOGRAPHY|
    WO2021154268A1|2020-01-30|2021-08-05|Hewlett-Packard Development Company, L.P.|Additive manufacturing tray|
    法律状态:
    2019-01-18| PLSC| Publication of the preliminary search report|Effective date: 20190118 |
    2019-06-20| PLFP| Fee payment|Year of fee payment: 3 |
    2020-05-15| CD| Change of name or company name|Owner name: S.A.S 3DCERAM-SINTO, FR Effective date: 20200407 |
    2021-04-09| ST| Notification of lapse|Effective date: 20210305 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1756694A|FR3068910B1|2017-07-13|2017-07-13|METHOD AND MACHINE FOR MANUFACTURING FLAT WORKPIECES OF CERAMIC AND / OR METALLIC MATERIAL BY THE TECHNIQUE OF ADDITIVE PROCESSES|
    FR1756694|2017-07-13|FR1756694A| FR3068910B1|2017-07-13|2017-07-13|METHOD AND MACHINE FOR MANUFACTURING FLAT WORKPIECES OF CERAMIC AND / OR METALLIC MATERIAL BY THE TECHNIQUE OF ADDITIVE PROCESSES|
    EP18179438.9A| EP3427924A1|2017-07-13|2018-06-25|Method and machine for manufacturing green ceramic and/or metal items using the additive processes technique|
    UAA201807767A| UA120671C2|2017-07-13|2018-07-11|METHOD AND MACHINE FOR MAKING PREPARATIONS OF CERAMIC AND / OR METALLIC MATERIAL BY ADDITIVE METHOD|
    KR1020180081096A| KR102075699B1|2017-07-13|2018-07-12|Method and machine for manufacturing green pieces made of ceramic and/or metallic material by the technique of additive manufacturing|
    JP2018132566A| JP2019031075A|2017-07-13|2018-07-12|Method and machine for manufacturing green pieces made of ceramic and/or metallic material by the technique of additive manufacturing|
    RU2018125625A| RU2688697C1|2017-07-13|2018-07-12|Method and machine for production of raw articles from ceramic and/or metal material by additive production technology|
    CN201810769628.6A| CN109249513A|2017-07-13|2018-07-13|The method and machine of green compact are manufactured by increases material manufacturing technology|
    US16/034,907| US20190015899A1|2017-07-13|2018-07-13|Method and machine for manufacturing green pieces made of ceramic and/or metallic material by the technique of additive manufacturing|
    [返回顶部]