Method for powder-based additive manufacturing of a part, in particular a lining element for a tire mould

A method for additive manufacturing of a plurality of components on a manufacturing support plate by powder sintering or melting using at least one beam of energy, each component comprising at least two opposite front frontal and rear frontal faces delimiting the thickness of the component and a plurality of protrusions projecting out from the front frontal face thereof, the method comprising the following steps:

• a) simultaneous manufacturing, by depositing and selective melting of layers of powder stacked on the manufacturing support plate, of a plurality of intermediate assemblies at least in one row, each intermediate assembly comprising:
• (i) a component produced at an inclined angle with respect to the manufacturing support plate and forming an angle of between 20° and 70° with the support plate,
• (ii) a support interposed between the manufacturing support plate and a lower base of the said component, and
• (iii) at least one local supporting element resting against the rear frontal face of the component, the local supporting element of the assembly being arranged and configured in such a way as to avoid any contact with the protrusions of the component of the adjacent intermediate assembly of the row, and
• (iv) fused powder layers of the component, of the support and of the local supporting element being joined to one another,
• b) formation, during the selective-melting phases of the manufacturing step, of incipient cracks in regions of connection of the support and of the supporting element to the component of each intermediate assembly, and
• c) separation of the component from the support and the local supporting element of each intermediate assembly after the manufacturing step by breaking of the connecting regions.