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AssigneeS.A.S. 3Dceram-Sinto
InventorsRichard Gaignon, Christophe Chaput
Estimating the term…
A computer model of the at least one piece to be manufactured is built up by computer-aided design; on a working tray, the piece is formed from a ceramic or metallic photocurable composition. At least one sacrificial organic material different from the basic CPCb or MPCb is prepared; successive CPCb or MPCb layers are formed, the following steps being carried out to form hollow parts of the piece and/or to insert at least one part into another ceramic or metallic material: forming a recess in a cured CPCb or MPCb layer from the upper surface thereof; depositing in the recess a MOS or CPCa or MPCa to fill; curing the MOS or CPCa or MPCa in the recess to obtain a hard horizontal surface at the same level as the nearby CPCb or MPCb layer.
1—A method for manufacturing at least one piece made of at least one material selected among the ceramic materials and the metallic materials by the technique of additive manufacturing, said at least one piece being formed in the green state and then being caused to be subjected to cleaning, debinding and sintering operations, said method comprising the following steps:
2—The method according to claim 1, characterised in that a CPCb or a MPCb having a pasty consistency which is spread in layers by scraping, or a suspended CPCb or MPCb which is applied by dipping the tray into a bath of said suspension so as to each time form the CPCb or MPCb layer to be cured, and by scraping the layer thus formed, is used.
3—The method according to claim 1, characterised in that, as a SOM,
4—The method according to claim 1, characterised in that, for the forming of the at least one recess, a mechanical machining is carried out.
5—The method according to claim 1, characterised in that, for the forming of the at least one recess, a laser machining is carried out, especially under the conditions of setting the laser power between 1 and 3 watts and the laser displacement speed between 1 and 100 millimetres per second.
6—The method according to claim 1, characterised in that, at each machining step, the debris are blown and sucked at the same time as said machining is carried out.
7—The method according to claim 1, characterised in that the SOM or the CPCa or the MPCa is applied in the at least one recess by a dispensing nozzle.
8—The method according to claim 1, characterised in that the curing is carried out by laser irradiating of each SOM or CPCa or MPCa layer under the conditions of setting the laser power between 70 and 700 milliwatts and a laser displacement speed between 1,000 and 6,000 millimetres per second, and of photocurable SOM layers placed in the recesses.
9—A machine for manufacturing at least one piece made of at least one material selected among the ceramic materials and the metallic materials by the method using the technique of additive manufacturing as defined in claim 1, characterised in that it comprises:
10—The machine according to claim 9, able to apply in layers a CPCb or MPCb under the form of a paste, characterised in that it comprises a gantry (5) provided with at least one scraping blade (6) and able to move onto the frame (4) above the working surface such that the free edge of the at least one scraping blade (6) is able to spread the layers of CPCb or MPCb paste on the working surface,
11—The machine according to claim 9, able to apply in layers a CPCb or MPCb under the form of a suspension, characterised in that it comprises a tank to be filled with said suspension, in which the working tray is able to be lowered step by step in order to form thereon, at each step, a layer to be irradiated, as well as a recoater in order to ensure that the suspension is dispensed on the entire surface to be irradiated.
12—The machine according claim 25, characterised in that the means for supplying at least one SOM or CPCa or MPCa onto the working surface are constituted by at least one dispensing nozzle moveable above a corresponding recess in order to apply the corresponding composition therein.
13—The machine according to claim 10, characterised in that the or at least one of the nozzles is supplied with SOM or CPCb or MPCb or CPCa or MPCa by a hose connected to a tank, in particular a piston supply tank.
14—The machine according to claim 5, characterised in that the or at least one of the nozzles is supplied with SOM or CPCb or MPCb or CPCa or MPCa by a cartridge which forms the upper part of it, which contains a stock of SOM or CPCb or MPCb or CPCa or MPCa and which is refillable from a supply tank that is be mounted or not on the machine, or which, when empty, is replaceable by a full cartridge, wherein this replacement can be ensured by a robotic arm.
15—The machine according to claim 15, characterised in that the or at least one of the nozzles moveably mounted: