Method for manufacturing pieces by the technique of additive manufacturing by pasty process and manufacturing machine for implementing the method

A machine for manufacturing green pieces made of ceramic material by the technique of additive manufacturing according to which layers of a 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 paste 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, which is in turn cured in the defined pattern,
• wherein the at least one blade is slidably mounted to go back and forth in the plane of the at least one scraping blade so as to ensure a back and forth movement, designated vibration movement, during at least a pass of the portal frame along the pass direction over the working surface.