Method for the powder-based additive manufacturing of a part, notably a lining blade for a tire mould, with an associated reinforcing element

A process for the additive manufacturing of at least one part by powder sintering or melting using at least one beam of energy, said part comprising at least two opposite frontal faces and at least two lateral end faces, the process comprising the following steps:

• a) manufacture, by deposition and selective melting of stacked layers of powder, of at least one intermediate element comprising the part and at least one local reinforcing element having a split tubular shape that surrounds one of the lateral end faces of the part and that face each of the frontal faces of said part adjacent to said end face, a portion of the part extending through the slit of the local reinforcing element and into said reinforcing element, the other portion of the part protruding outside of the reinforcing element, said reinforcing element extending in a direction substantially parallel to the stacking direction of the layers,
• wherein during the manufacturing step, for each fused layer of powder of the part and each fused layer of powder of the local reinforcing element, the deposited powder present between each frontal face of said fused powder layer of the part and the facing end face of said fused powder layer of the reinforcing element is completely or partially fused by heat diffusion and not directly by the beam of energy, and
• b) after manufacture, gripping said other portion of the part protruding outside of the reinforcing element separation of the part and of the local reinforcing element by pulling along a direction perpendicular to the stacking direction of the layers.