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

A machine for manufacturing pieces made of ceramic material, by the technique of additive manufacturing according to which layers of photocurable paste are successively allowed to cure by irradiation according to a pattern defined for each layer, the machine comprising:

• a frame surrounding a horizontal working tray comprising a working surface;
• a portal frame equipped with at least one scraping blade, the portal frame being adapted to move on the frame over the working tray so that the free edge of the at least one scraping blade is adapted to spread, by scraping, paste layers over the working surface, the layers being vertically superimposed;
• irradiation means facing the working tray to irradiate each layer once spread to cure the layer in the previously defined pattern before spreading the following layer, the following layer being in turn cured in the defined pattern;
• and
• supplying means of an amount of paste on the working tray upon each formation of a layer, the amount being intended to be spread by scraping by the at least one scraping blade so as to form the associated layer,
• wherein the supplying means of an amount of paste on the working tray are constituted by at least one dispensing nozzle moveable in front of the forefront of at least one scraping blade, the at least one dispensing nozzle being adapted to apply paste according to a predefined program corresponding to the associated layer, so that the at least one scraping blade can spread the paste applied in a uniform layer when passing over the layer.