• 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 subject of the invention is a process for manufacturing a part, in particular a ceramic material, by means of additive processes, in which layers of a photocurable paste are successively hardened in a pattern defined for each layer, the first layer being formed on a work surface on a work table, each layer being, before curing in a defined pattern, scraped off by a scraper blade or parallel scraper blades from a quantity of paste fed to said work plate, which is lowered at each layer formation, characterized in that at each layer formation, the amount of dough required to form said layer is dispensed onto the work surface from at least one nozzle (8) which is moved in front of the scraper blade, or in the case of parallel doctor blades, in front of the front scraper blade.
    公开号:FR3063450A1
    申请号:FR1751685
    申请日:2017-03-01
    公开日:2018-09-07
    发明作者:Richard GAIGNON；Christophe Chaput
    申请人:3DCeram SAS；
    IPC主号:
    专利说明:

    063 450
    51685 ® FRENCH REPUBLIC
    NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY © Publication number:
    (to be used only for reproduction orders)
    ©) National registration number
    COURBEVOIE © Int Cl 8 : B 29 C 64/106 (2017.01), B 29 C 64/205, B 28 B 1/00, C 04 B 35/622, B 33 Y 10/00, 30/00, 40 / 00
    A1 PATENT APPLICATION
    ©) Date of filing: 01.03.17. ©) Applicant (s): 3DCERAM Société par actions simpli- (30) Priority: trusted - FR. @ Inventor (s): GAIGNON RICHARD and CHAPUT CHRISTOPHE. (43) Date of public availability of the request: 07.09.18 Bulletin 18/36. ©) List of documents cited in the report preliminary research: Refer to end of present booklet (© References to other national documents ©) Holder (s): 3DCERAM Simplified joint-stock company. related: ©) Extension request (s): ® Agent (s): CABINET CHAILLOT.
    PROCESS AND MACHINE FOR MANUFACTURING PARTS BY THE TECHNIQUE OF ADDITIVE PROCESSES BY PASTA WITH IMPROVED PASTE FEEDING.
    FR 3 063 450 - A1
    The subject of the invention is a method of manufacturing a part, in particular a green part made of ceramic material, by the technique of additive methods according to which layers of a photocurable paste are successively caused to harden according to a pattern defined for each layer, the first layer being formed on a work surface on a work surface, each layer being, before hardening in a defined pattern, spread by scraping by a scraping blade or parallel scraping blades from a quantity of dough brought to said working plate, which is lowered at each layer formation, characterized in that at each layer formation, the quantity of dough necessary for forming said layer is distributed over the working surface, starting from at least one nozzle (8) which is moved in front of the doctor blade, or in the case of parallel doctor blades, in front of the front doctor blade.

    i
    METHOD AND MACHINE FOR MANUFACTURING PARTS BY
    TECHNIQUE FOR ADDITIVE PROCESSES BY PASTE WITH
    IMPROVED PASTA FEED
    The present invention relates to a method and a machine for manufacturing parts by the technique of additive methods, also called stereolithography.
    These parts are in particular raw parts made of ceramic material, intended to be subjected to cleaning, debinding and sintering operations in order to obtain finished ceramic parts.
    The technique of additive processes for obtaining such green parts generally comprises the following stages:
    - Construction, by computer-aided design, of a computer model of the part to be manufactured, the dimensions of this model being larger than those of the part to be manufactured in order to provide for a withdrawal of the ceramic during the firing of the room ;
    - Formation on a rigid work platform of a first layer of a photocurable composition comprising for example at least one ceramic material, at least one photocurable monomer and / or oligomer, at least one photoinitiator and usually at least one plasticizer and / or at least one dispersant;
    hardening of said first layer by irradiation according to a pattern defined from the model for said layer, forming a first stage;
    - Formation, on said first stage, of a second layer of the photocurable composition;
    - Hardening of said second layer by irradiation according to a pattern defined for said layer, forming a second stage;
    - repetition of the stages of layer formation followed by hardening of the layer until the part is obtained in the raw state.
    The irradiation of the layers is carried out by laser scanning of the free surface of the spread photocurable composition or by a diode projection system (LED) or by any other light sources particularly of UV type.
    The present invention relates to the technique of additive processes in which the photocurable composition is in the form of a paste, the composition of which is photocurable, such as that mentioned above, and the viscosity of which can vary in particular from 1 Pa.s to infinity for a zero shear rate.
    In pasty manufacturing, the work plate supports the different layers of the part under construction as well as the quantity of dough to spread each time a layer is formed. Each of the layers is formed by lowering the working plate and spreading a bead of dough to obtain a layer of a predefined thickness of dough formed on the working plate for the first layer or on the previous layer for the other layers of stacking. For this purpose, a reserve of dough is stored in a tank which is automatically emptied of the quantity of dough predefined with each layer using a piston, the piston raising this quantity of dough through a slot to form the bead in the vicinity of an edge of the work surface. The bead of dough is then spread by scraping by a scraper blade which, coming to be placed behind it, advances it by sweeping the work surface to its opposite edge in order to spread the bead in a passing movement perpendicular to the edge of the scraper blade.
    Such a supply of dough to the work tray has several drawbacks:
    - Significant scraping forces can be generated during the construction phase in layers, so that the parts break or move during their construction, generating defects;
    - the volume of the dough roll corresponds to the length of the work surface; in other words, the larger the work surface, the more dough is needed; this induces difficulties:
    - across the width: the dough supply system is supposed to distribute the dough evenly over the entire width; such a homogeneous width distribution is difficult to develop in practice because the distribution depends on the width and the quantity of dough; if the quantity of dough brought in is too low (raising the piston too low), the dough tends to come out in the middle and little on the sides, which means that a minimum rise in dough must be imposed in order to seek good homogeneity, with the risk having excess dough in the middle of the work surface;
    - on the length: the longer the work surface, the more the scraper blade must push dough to spread it; on the one hand, this increases the risk of formation of menisci, which generate defects in parts, such as a lack of material, a tearing, etc., and, on the other hand, the larger the pushed bead, the more stresses are generated on the already hardened lower layers;
    on the diapers
    - the parts built can only be constructed from a single ceramic material because there is only one supply of paste.
    In conclusion, the current dough supply system does not always ensure the homogeneity of each spread layer, leads to significant scraping efforts which can damage or even destroy the parts under construction, limits the working surface as well in length only in width, limits the height of the parts to be built and allows only one ceramic to be printed at a time.
    The Depositing Company sought a new system for supplying dough which made it possible to eliminate at least one of these drawbacks.
    To this end, it is provided, according to the invention, to no longer bring the dough from a bead of dough brought along an edge of the work surface, but to distribute it on the work surface from above the work surface, in particular from at least one nozzle arranged above the work surface and movable to ensure regular distribution thereon.
    By providing, for example, a nozzle for distributing a bead of dough, which nozzle moves both back and forth across the width of the work surface (along the Y axis) and in a straight line along the length of the work surface (along the X axis) so that the bead of dough is always placed in front of the scraper blade in operation, a regular coil of dough is formed on the work surface which ensures a regular and continuous spreading of that -this and which does not require a significant scraping effort because the scraper blade only pushes at any time the useful quantity of dough.
    Thus, the shear stresses linked to spreading the dough over a long length are made minimal, or even eliminated, and the formation of menisci is greatly reduced.
    In addition, such a distribution of the dough can be carried out in the transverse direction over a width of the work plate much greater than that of the work plates existing hitherto. The invention will therefore make it possible to produce work platforms that are much wider than currently (300 mm maximum) and in theory with unlimited widths.
    Also, like the quantity paste for a layer is not all brought initially but at as and measured advancement of the blade of scraping while being brought in front of it any either his position in advance it is possible of well in adjust the quantity
    useful for avoiding the formation of menisci and making the stresses on the already hardened lower layers minimal or even zero; as a result, the scraper blade can be made to work over a much greater length and more quickly due to the absence of constraints or lesser constraints.
    In addition, the fact that at each layer formation, only the quantity of paste necessary is brought in, makes it possible to form the layers with materials which may be different from one layer to another. It therefore becomes possible to form multi-material pieces, for example ceramics.
    It is of course envisaged, in the context of the present invention, that several nozzles are activated on the same pass, simultaneously or not by programming the nozzles, in the manner of an inkjet printer, in order to have several materials on the same layer. It is therefore possible to deposit different materials at different widths on the same layer.
    In addition, it becomes possible to provide layers of photocurable composition without the ceramic material, in other words of a composition comprising at least one photocurable monomer and / or oligomer, at least one photoinitiator and if necessary at least one adjuvant. such as plasticizer or dispersant. Such layers can be support layers which will be destroyed during the debinding of the part or even be layers which create useful cavities during the construction of the parts, which layers will be destroyed during debinding.
    Finally, it is possible to envisage that the distribution of dough in front of the blade is programmable, that is to say engaged and stopped on setpoint, which makes it possible to envisage the formation of several pieces in parallel over the width and / or the length of a work plate, the distribution of dough by the nozzle (s) being engaged only around the location of each piece to be formed on the work plate.
    The subject of the invention is a method of manufacturing a part, in particular a green part made of ceramic material, by the technique of additive methods according to which layers of a photocurable paste are successively caused to harden according to a pattern defined for each layer, the first layer being formed on a work surface on a work surface, each layer being, before hardening in a defined pattern, spread by scraping by a scraping blade or parallel scraping blades from a quantity of dough brought to said working plate, which is lowered at each layer formation, characterized in that at each layer formation, the quantity of dough necessary for forming said layer is distributed over the working surface, starting from at least one nozzle which is moved in front of the doctor blade, or in the case of parallel doctor blades, in front of the front doctor blade.
    The nozzle or each nozzle can be moved transversely back and forth parallel to the scraper blade or to the scraper blades and longitudinally according to the advance movement of the scraper blade (s) from an edge of the work surface at the opposite edge of it.
    It is possible to adjust at least one parameter chosen from the flow rate of the nozzle or of each nozzle and the transverse and longitudinal displacement speeds of the nozzle or of each nozzle as a function of at least one parameter chosen in particular from the viscosity of the paste and the thickness of the layer.
    You can control the distribution of dough by a nozzle or each nozzle depending on the layer to be formed.
    The nozzle or each nozzle can be supplied with dough by a dough supply pipe coming from a dough reservoir or the nozzle or each nozzle can be supplied with dough by a dough cartridge of which it forms the upper part and which contains a reserve of paste advantageously sufficient for the formation of at least one layer.
    The dough can be distributed from at least two nozzles aligned along an axis parallel to the scraper blade (s) or along an axis perpendicular to the scraper blade (s).
    When spreading at least one of the layers of dough, at least one scraper blade can be brought into the working position, in addition to its scraper advance movement, to move back and forth. in its plane according to a so-called vibration movement.
    The deposition of dough can be controlled continuously, thus forming a roll of dough on the work surface, and / or discontinuously, thus forming deposits by points on the work surface.
    The subject of the invention is also a machine for manufacturing parts, in particular raw parts made of ceramic material, by the technique of additive methods according to which layers of photocurable paste are successively caused to harden by irradiation according to a pattern defined for each layer, said machine comprising:
    - a frame framing a horizontal work surface including a work surface;
    - a gantry fitted with at least one scraper blade, the gantry being able to move on the frame above the work platform so that the free edge of the scraper blade (s) is able to spread by scraping layers of dough on the work surface, said layers being vertically superimposed;
    - irradiation means facing the work plate to irradiate each layer once spread to harden it in the previously defined pattern before spreading the next layer, which in turn is hardened in the defined pattern; and
    - means of supply d ' a quantity of dough on the work tray at each training of layer, said quantity being intended to be spread out by scraping over there or the scraper blades for form the associated layer, characterized by the fact than ways supply of a
    quantity of dough on the work surface consists of at least one dispensing nozzle which can be moved in front of the scraper blade or, in the case of parallel scraper blades, in front of the front scraper blade, the or each dispensing nozzle being capable of apply paste according to a predefined program corresponding to the associated layer, so that the scraper blade (s) can spread the applied paste in a uniform layer during its passage or when it passes over it.
    The or at least one of the nozzles of the machine can be supplied with dough by a flexible hose connected to a dough tank, in particular a piston feed tank or the or at least one of the nozzles can be supplied in dough by a dough cartridge of which it forms the upper part, which contains a dough reserve advantageously sufficient for the formation of at least one layer, and which is refillable from a supply tank mounted or not on the machine or which can be replaced when empty by a full cartridge, this replacement can be ensured by a robotic arm.
    The or at least 1 'a of: movable to Using a arms robot which allows a displacement in front of the r The or each nozzle can suitable gantry to move sure
    work platform according to the length thereof, said gantry being the gantry provided with the scraper blade (s) or being another gantry, movable independently thereof, the or each nozzle being moreover movable mounted on a transverse rail of the porch that carries it.
    In a particular embodiment, the gantry is a gantry provided with scraper blades, comportantο comprising in particular two scraper blades, one being operational during a displacement of the gantry in one direction and the other, during a displacement of the gantry in the other direction, the or each nozzle being movably mounted on a transverse rail of said gantry, the or each nozzle being arranged between the two blades.
    In a particular embodiment, the machine according to the present invention may comprise at least two nozzles arranged along the axis of advance of the gantry or along a transverse axis.
    The amplitude of one or each nozzle in the gantry can be greater than the width of the work table, so that each nozzle is suitable for
    distribute of the dough in every point from the plateau of job. The machine according the current invention can include of means for adjusting at least one parameter
    chosen from the flow rate of the nozzle or of each nozzle and the transverse and longitudinal displacement speeds of the or each nozzle, as a function of at least one parameter chosen in particular from the viscosity of the paste and the thickness of the layer.
    The machine according to the present invention may comprise means for controlling the deposition of dough continuously, thus forming a roll of dough on the work surface, and / or discontinuously, thus forming deposits by points on the work surface.
    To better illustrate the object of the present invention, several specific embodiments of the scraper device of the machine according to the invention will be described below, by way of indication and without limitation, with reference to the attached drawing. On each of the Figures, the π
    arrow indicates the direction of advance of the scraper device.
    On this drawing :
    - Figures la and lb are schematic perspective views respectively showing the rear and the front of a scraper device according to a first embodiment of the invention;
    - Figures 2a and 2b are schematic perspective views respectively showing the rear and the front of a scraper device according to a second embodiment of the invention; Figure 2c is a view similar to Figure 2b showing the device in the dough cartridge refill position;
    - Figures 3a to 3e show schematic perspective views of a scraper device according to a third embodiment of the invention in different positions / orientations in which two scraper blades carried by the same double gantry are provided, l 'one operational in a first direction of advance of the gantry and the other being operational in the opposite direction of return of said double gantry; Figures 3f and 3g show this scraper device in which the double gantry is only partially shown, simply showing one of the blades;
    - Figures 4a and 4b show two schematic perspective views of two different positions of a scraper device according to a fourth embodiment of the invention, according to which the scraper blade is carried by a gantry, and a nozzle dough distribution is carried by another gantry independent of the previous one;
    - Figures 5a to 5c show three schematic perspective views showing, seen from the rear, three different positions of a scraper device according to a fifth embodiment of the present invention, according to which three dough distribution nozzles are provided, mounted in an alignment parallel to two scraper blades;
    - Figures 6a and 6b are two perspective views of two different positions of a scraper device according to a sixth embodiment of the present invention, according to which are also provided three dough distribution nozzles, mounted in a parallel alignment a scraper blade; and
    - Figure 7 is a perspective view of a scraper device according to a seventh embodiment of the present invention, according to which three dough dispensing nozzles are mounted in an alignment perpendicular to the scraper blade.
    First embodiment: Figures la and lb
    Referring to Figures la and lb, it can be seen that there is shown a scraper device 1 of a layer of dough on a work surface of a horizontal work plate 2 of a manufacture of raw bodies in ceramic material by the technique of additive processes. Figure 1a shows the back of the scraping device, and Figure 1b shows the front of it.
    The scraping device 1 comprises, mounted sliding on the frame 3 of the machine, a gantry 4 with a motor which drives it with ball screw or rack. A blade holder 5, in which a scraper blade 6 is arranged, is integral with the gantry 4.
    The frame 3 comprises two elongated blocks 3a situated on either side of the work plate 2, each of these blocks 3a carrying a rib 3b which extends horizontally over its entire external lateral face and whose role is indicated below.
    The gantry 4 consists of a block comprising an upper part 4a in the form of an elongated rectangular parallelepiped which is arranged above the work plate 2 and the frame 3, transversely to the blocks 3a, and which is extended by two lower lateral parts 4b.
    The rear face of the upper part 4a carries two vertical projections 4c, each of U-shaped section, one wing of which is attached to said rear face. The grooves 4d of these U-shaped sections are arranged opposite one another. The role of these grooves 4d is indicated below.
    In the vicinity of its base, each lateral part 4b comprises, turned inwards, a groove 4e in which the associated block 3a of the frame 3 is capable of sliding by its corresponding rib 3b.
    The blade holder 5 consists of a plate able to slide vertically by its two lateral edges in the grooves 4d of the associated vertical projections 4c of the gantry 4. The scraper blade 6 is carried by the lower part of the blade holder 5. see this scraper blade 6 in Figure 1.
    According to the invention, and as can be seen in FIG. 1b, the front face of the upper part 4a of the gantry 4 carries a horizontal rail 7 which extends from one vertical edge to the other of the part 4a and in which a nozzle 8 is slidably mounted, the outlet orifice 8a of which is oriented vertically so as to be above the work plate 2 at all times in front of the scraper blade 6. The nozzle 8 is continuously supplied by a flexible hose 9 connected to a supply tank 10, for example a piston supply tank.
    The operation of the scraping device 1χ of Figures la and lb is as follows:
    If we refer to Figure la, we can see that the scraper blade 6 is in the scraping position, the blade holder 5 having been lowered by sliding in the rails 4d of the gantry 4 and stopped in a position such that the associated blade 6 can, during its scraping, come to form the desired layer height.
    In the position of Figure la, the nozzle 8 is in the rest position. For spreading the dough layer, from the position of Figure la:
    - The nozzle 8 is connected to the reservoir 10 by the hose 9;
    - The nozzle 8 is moved by translation in the rail 7 so that its orifice 8a comes above an edge of the work plate 2;
    - We start spreading the dough by advancing the gantry 4 according to the arrow (Figure la); during this advance of the gantry 4, the supply of the nozzle 8 is controlled by the flexible pipe 9 at the same time as the displacement of the nozzle 8 in translation from the aforementioned transverse edge to the other, then back and so on back and forth. As the gantry 4 advances simultaneously, a roll of dough is deposited in a zig-zag on the plate 2, and immediately scraped by the scraper blade 6 until the layer is completely formed.
    The gantry 4 having arrived at the end of its stroke, in other words the layer of dough having been completely deposited, the supply of the nozzle 8 is cut, the scraper blade 6 is lifted by raising the blade holder 5 and the gantry 4 is returned to its starting position (Figure lb). In Figure 1b, the nozzle 8 has been shown in an intermediate position along the rail 7; in this case, it will be returned to the starting position for the deposition of a new layer (position in Figure la).
    Second embodiment (Figures 2a to 2c)
    If we refer to Figures 2a to 2c, we can see that there is shown a scraper device 1 2 which differs from the scraper device 1 2 in that the nozzle 8 is surmounted by a reserve of paste 11. This reserve 11 is refillable from a reservoir 10 having an outlet pipe 9 ', of bent shape in the example shown, which is capable of being connected by a short pipe 9''projecting out of the nozzle 8.
    The operation of the scraping device 1 2 of FIGS. 2a to 2c is the same as that of the device 1 2 of FIGS. 1a and 1b, except that the filling of the nozzle 8 takes place during the connection between the tubing 9 'and the short pipe 9 (Figure 2c); after filling, the short pipe 9 and the tubing 9 'are detached from each other.
    In Figure 2c, there is shown the scraping device 1 2 before the formation of a layer of dough, in the rest position, the blade holder 5 being in the raised position. The nozzle 8 is in the paste filling position, the quantity of paste having to be sufficient for the formation of the layer.
    Starting from the position shown in Figure 2c, to spread a layer of dough on the work plate 2, lower the blade holder 5 to place the associated blade in the scraping position and detach the tubing 9 'from the short pipe 9 once the nozzle 8 is filled with paste.
    We then control the simultaneous movements in advance of the gantry 4 and back and forth of the nozzle 8 in the rail 7 (see Figure 2b where the gantry 4 is seen from the front, and Figure 2a where the gantry is seen from the back).
    Once the layer of dough has been deposited, the blade holder 5 is raised and the gantry 4 is returned to the position in FIG. 2c, and a refill of the nozzle 8 is carried out with a view to depositing dough for the next layer.
    Third embodiment: Figures 3a to 3g
    If we refer to Figures 3a to 3g, we can see that there is shown a scraper device I3 which differs from the scraper device 1 2 in that the gantry 4 is replaced by the double gantry 4 '. The latter therefore consists of two gantries of the same type as the gantry 4, parallel, joined by their lower lateral parts to move in one piece.
    The faces of the upper parts of the two gantries making up the double gantry 4 'each carry two U-shaped projections arranged opposite one another (respectively two projections 4'c and two projections 4c), in which are slidably mounted , in the same way as in the previous embodiments, the blade holders respectively 5 and 5 'with their associated scraper blades (see blade 6' in Figures 3f and 3g).
    In the example shown, only the gantry of the double gantry 4 'carrying the blade holder 5' has, on its inner face - that facing the other gantry, the rail 7 on which the nozzle 8 is slidably mounted transversely surmounted by its refill 11. Thus the nozzle 8 is able to move between the two gantries of the double gantry 4 '.
    Thus, the double gantry 4 'will move from one end to the other of the work plate 2 in a forward stroke where only a scraper blade associated with a blade holder will be active, the opposite blade holder being raised so that its associated blade, raised, is not operational, the double gantry 4 'then moving in a return stroke for which the blades will be successively raised and lowered.
    In Figures 3f and 3g - as well as in the following figures - "b" designates the bead and "c" the dough bead.
    The operation of the scraping device I3 can be described with reference to Figures 3a to 3e:
    Figure 3a (rear view) and Figure 3b (front view) Formation of a layer
    The blade associated with the blade holder 5 is lowered and that associated with the blade holder 5 'is raised. The blade associated with the blade holder 5 is therefore functional, the gantry 4 moving according to the arrow indicated with deposition of paste by the nozzle 8 which moves transversely back and forth along the rail 7.
    Figure 3c
    After formation of the layer, the recharging takes place as in the previous embodiment. The blade associated with the blade holder 5 'is lowered and that associated with the blade holder 5 is raised. The blade associated with the blade holder 5 ′ will therefore be functional for the formation of the next layer, the gantry 4 ′ being ready to move in the opposite direction.
    Figures 3d and 3e: Formation of the next layer
    The gantry 4 'moves according to the arrow (Figure 3d: initial position and Figure 3e: final) with deposition of paste by the nozzle 8 which crosses back and forth along the rail 7.
    indicated position moves
    Fourth embodiment: Figures 4a and 4b
    If we refer to Figures 4a and 4b, we can see that there is shown a scraper device 1 4 which differs from the scraper device 1 2 in that it comprises, at a distance from the gantry 4, a gantry 12, which can be moved independently of gantry 4. Gantry 4 carries the blade holder 5 and its associated scraper blade, but does not have the rail 7. It is gantry 12 which presents the rail, designated by 7 ' , on which the nozzle 8, with its refill, is slidably mounted transversely.
    The operation is the same as for devices 1 4 and 1 2 .
    You can see, in comparing the Figures 4a and 4b, that the cord filing of dough c by the nozzle 8, may be independently controlled of the blade of scraping.
    Fifth embodiment: Figures 5a to 5c
    If we refer to Figures 5a to 5c, we can see that there is shown a scraping device I5 which differs from the scraping device I3 in that, in the rail 7, three nozzles are slidably mounted - including we can see the refills 11A, 11B, 11C - arranged side by side.
    Sixth embodiment: Figures 6a and 6b
    If we refer to Figures 6a and 6b, we can see that there is shown a scraper device 1 6 which differs from the scraper device I2 in that, in the rail 7, are mounted side by side three nozzles 8A, 8B, 8C surmounted by their refills respectively 11A, 11B, 11C which are manually exchangeable.
    Seventh embodiment: Figure 7
    If we refer to Figure 7, we can see that there is shown a scraping device I7 which differs from the scraping device 1β in that the nozzles 11A ', 11B' and 11C 'are joined in a direction transverse to rail 7.
    Devices I5, 1β and I7 can be useful if you want to deposit a lot of dough or if you want to change the type of dough between layers, in which case only one nozzle is used to apply a layer.
    权利要求:
    Claims (18)
    [1" id="c-fr-0001]
    1 - Process for manufacturing a part, in particular a raw part made of ceramic material, by the technique of additive methods according to which layers of a photocurable paste are successively caused to harden according to a pattern defined for each layer, the first layer being formed on a work surface on a work plate (2), each layer being, before hardening in a defined pattern, spread by scraping by a scraping blade (6) or parallel scraping blades from an amount of dough supplied to said work plate (2), which is lowered at each layer formation, characterized in that at each layer formation, the quantity of dough necessary to form said layer is distributed over the work surface layer, from at least one nozzle (8) which is moved in front of the scraper blade (6), or in the case of parallel scraper blades, in front of the front scraper blade.
    [2" id="c-fr-0002]
    2 - Method according to claim 1, characterized in that the nozzle (8) or each nozzle is moved transversely back and forth parallel to the scraper blade (6) or to the scraper blades and longitudinally along the movement of the scraper blade (s) in advance from one edge of the working surface to the opposite edge thereof.
    [3" id="c-fr-0003]
    3 - Method according to claim 2, characterized in that at least one parameter is chosen chosen from the flow rate of the nozzle (8) or of each nozzle and the transverse and longitudinal displacement speeds of the nozzle (8) or of each nozzle as a function of at least one parameter chosen in particular from the viscosity of the paste and the thickness of the layer.
    [4" id="c-fr-0004]
    4 - Method according to one of claims 1 to
    3, characterized in that the distribution of dough is controlled by a nozzle (8) or each nozzle according to the layer to be formed.
    [5" id="c-fr-0005]
    5 - Method according to one of claims 1 to
    4, characterized by the fact that the nozzle (8) or each nozzle is supplied with paste by a paste supply pipe (9) coming from a paste reservoir (10).
    [6" id="c-fr-0006]
    6 - Method according to one of claims 1 to 4, characterized in that one feeds the nozzle (8) or each nozzle in paste by a paste cartridge (11) of which it forms the upper part and which contains a dough reserve advantageously sufficient for the formation of at least one layer.
    [7" id="c-fr-0007]
    7 - Method according to one of claims 1 to
    6, characterized in that the paste is distributed from at least two nozzles (11A, 11B, 11C) aligned along an axis parallel to the scraper blade (s) or along an axis perpendicular to the blade (s) scraping.
    [8" id="c-fr-0008]
    8 - Method according to one of claims 1 to
    7, characterized in that during the spreading of at least one of the layers of dough, at least one scraper blade is brought into the working position, in addition to its advance scraper movement to move back and forth in its plane according to a so-called vibration movement.
    [9" id="c-fr-0009]
    9 - Method according to one of claims 1 to
    8, characterized by the fact that the deposition of dough is controlled continuously, thus forming a roll of dough on the working surface, and / or discontinuously, thus forming deposits by points on the working surface.
    [10" id="c-fr-0010]
    10 - Machine for manufacturing parts, in particular raw parts made of ceramic material, by the technique of additive processes according to which layers of photocurable paste are successively caused to harden by irradiation according to a pattern defined for each layer, said machine comprising:
    - a frame (3) framing a horizontal work plate (2) comprising a work surface;
    - a gantry (4; 4 ') provided with at least one scraper blade (6), the gantry (4; 4') being able to move on the frame (3) above the work table (2 ) such that the free edge of the scraper blade (s) is capable of spreading layers of dough by scraping onto the working surface, said layers being vertically superimposed;
    - irradiation means facing the work plate to irradiate each layer once spread to harden it in the previously defined pattern before spreading the next layer, which in turn is hardened in the defined pattern; and
    - means of supply d ' a quantity of dough on the work tray at each training of layer, said quantity being intended to be spread out by scraping over there or the scraper blades for form the associated layer, characterized by the fact than ways supply of a
    quantity of dough on the work plate (2) consist of at least one dispensing nozzle (8; 8A,
    8B, 8C) movable in front of the scraper blade or, in the case of parallel scraper blades, in front of the front scraper blade, the or each dispensing nozzle (8; 8A, 8B, 8C) being capable of applying paste according to a predefined program corresponding to the associated layer, so that the scraper blade (s) can spread the applied paste in a uniform layer when it is passed or when it passes over it.
    [11" id="c-fr-0011]
    11 - Machine according to claim 10, characterized in that the or at least one of the nozzles (8) is supplied with pulp by a flexible pipe (9) connected to a pulp tank (10), in particular a tank piston feed.
    [12" id="c-fr-0012]
    12 - Machine according to claim 10, characterized in that the or at least one of the nozzles (8) is supplied with dough by a dough cartridge (11) of which it forms the upper part, which contains a dough reserve advantageously sufficient for the formation of at least one layer, and which is refillable from a supply tank mounted or not mounted on the machine or which is replaceable when it is empty by a full cartridge, this replacement being able to be ensured by a robotic arm.
    [13" id="c-fr-0013]
    13 - Machine according to one of claims 10 to 12, characterized in that the or at least one of the nozzles (8) is movably mounted using a robotic arm, or on a support which allows a displacement before scraping.
    [14" id="c-fr-0014]
    14 - Machine according to one of claims 10 to 12, characterized in that the or each nozzle (8) is mounted on a gantry (4) able to move on the frame (3) above the work table (2) depending on the length thereof, said gantry (4) being the gantry provided with the scraper blade (s) or being another gantry (12), movable independently thereof, the or each nozzle (8) being also movably mounted on a transverse rail (7, 7 ') of the gantry (4; 12) which carries it.
    [15" id="c-fr-0015]
    15 - Machine according to claim 14, characterized in that the gantry is a gantry (4 ') provided with scraper blades, comprising in particular two scraper blades, one being operational during movement of the gantry (4' ) in one direction and the other, during a movement of the gantry in the other direction, the or each nozzle (8) being movably mounted on a transverse rail (7) of said gantry (4), the or each nozzle ( 8) being disposed between the two blades.
    [16" id="c-fr-0016]
    16 - Machine according to one of claims 10 to
    15, characterized in that it comprises at least two nozzles (8A, 8B, 8C; 8Ά, 8'B, 8'C) arranged along the axis of advance of the gantry or along a transverse axis.
    [17" id="c-fr-0017]
    17 - Machine according to one of claims 10 to
    16, characterized in that the amplitude of one or each nozzle (8) in the gantry is greater than the width of the work plate (2), so that each nozzle is able to distribute dough in each point of the work plate (2).
    [18" id="c-fr-0018]
    18 - Machine according to one of claims 10 to
    17, characterized in that it comprises means for adjusting at least one parameter chosen from the flow rate of the nozzle (8) or of each nozzle (8) and the speeds of
    5 transverse and longitudinal displacement of the nozzle (8) or each nozzle (8), as a function of at least one parameter chosen in particular from the viscosity of the paste and the thickness of the layer.
    10 19 - Machine according to one of claims 10 to
    18, characterized in that it comprises means for controlling the deposition of dough continuously, thus forming a roll of dough on the working surface, and / or discontinuously, thus forming deposits by points on the
    15 work surface.
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    同族专利:
    公开号 | 公开日
    RU2684680C1|2019-04-11|
    EP3369555A1|2018-09-05|
    PT3369555T|2019-09-26|
    US20180250845A1|2018-09-06|
    JP2018144486A|2018-09-20|
    ES2747766T3|2020-03-11|
    EP3369555B1|2019-07-17|
    UA120659C2|2020-01-10|
    FR3063450B1|2019-03-22|
    CN108527603A|2018-09-14|
    JP6660969B2|2020-03-11|
    KR20180100493A|2018-09-11|
    KR102039061B1|2019-10-31|
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    法律状态:
    2018-02-23| PLFP| Fee payment|Year of fee payment: 2 |
    2018-09-07| PLSC| Search report ready|Effective date: 20180907 |
    2020-02-27| PLFP| Fee payment|Year of fee payment: 4 |
    2020-05-15| CD| Change of name or company name|Owner name: S.A.S 3DCERAM-SINTO, FR Effective date: 20200407 |
    2021-03-24| PLFP| Fee payment|Year of fee payment: 5 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1751685|2017-03-01|
    FR1751685A|FR3063450B1|2017-03-01|2017-03-01|METHOD AND MACHINE FOR MANUFACTURING WORKPIECES BY THE TECHNIQUE OF PASTAID ADDITIVE PROCESSES WITH PERFECTED PULP MIXTURE|FR1751685A| FR3063450B1|2017-03-01|2017-03-01|METHOD AND MACHINE FOR MANUFACTURING WORKPIECES BY THE TECHNIQUE OF PASTAID ADDITIVE PROCESSES WITH PERFECTED PULP MIXTURE|
    ES18152848T| ES2747766T3|2017-03-01|2018-01-22|Parts manufacturing process and machine using the paste processing additive process technique with improved paste transport|
    EP18152848.0A| EP3369555B1|2017-03-01|2018-01-22|Method and machine for manufacturing parts by the technique of additive methods by paste processing with improved paste transport|
    PT18152848T| PT3369555T|2017-03-01|2018-01-22|Method and machine for manufacturing parts by the technique of additive methods by paste processing with improved paste transport|
    US15/897,880| US20180250845A1|2017-03-01|2018-02-15|Method for manufacturing pieces by the technique of additive manufacturing by pasty process with an improved supply of paste and manufacturing machine for implementing the method|
    UAA201801864A| UA120659C2|2017-03-01|2018-02-23|METHOD OF MANUFACTURE OF PRODUCTS BY ADDITIVE METHOD WITH ADVANCED SUPPLY OF PASTE-MASS AND MACHINE FOR IMPLEMENTATION OF THIS METHOD|
    RU2018107434A| RU2684680C1|2017-03-01|2018-02-28|Method for production of parts using additive production technology by means of semi-liquid process with improved paste supply and machines for implementation of method|
    JP2018035488A| JP6660969B2|2017-03-01|2018-02-28|A method of manufacturing a piece by an additive manufacturing technique by processing a paste, in which the supply of the paste is improved, and a manufacturing machine for performing the method|
    KR1020180024440A| KR102039061B1|2017-03-01|2018-02-28|Method for manufacturing pieces by the technique of additive manufacturing by pasty process with an improved supply of paste and manufacturing machine for implementing the method|
    CN201810172715.3A| CN108527603A|2017-03-01|2018-03-01|Method and machine for manufacturing blank by increases material manufacturing technology|
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