Patent ID: 9707718
Date: 2017-07-18
CPC Classifications: B22F,B29C,B33Y,Y02P

Claim:
1. A method of fabricating a part by selective melting or selective sintering of powder beds by an energy beam, the method comprising: a) providing a device having a feeder vessel, a building vessel with a bottom constituted by a fabrication plate that is movable in vertical translation, a transfer system suitable for depositing powder from said feeder vessel to said building vessel as a powder layer of constant thickness, and an energy beam optical system suitable for scanning the surface of said deposited powder layer in order to melt or sinter together the particles present in predetermined zones of the deposited powder layer; b) providing a powder placed in said feeder vessel; c) depositing a first series of powder layers on the fabrication plate and melting or sintering together the particles of powder after depositing each new layer of powder so as to discontinuously form above the fabrication plate a plurality of columns of material that are surrounded by volumes of powder particles so as to be separated from one another by the powder particles, each of the columns being a single-piece column; and d) depositing a second series of layers of powder on said first series of layers of powder particles and melting or sintering together the powder particles of the second series after depositing each new layer of powder so as to form a single-piece element comprising the part and surmounting said columns of material, wherein the columns of material of said first series of layers of powder particles form a thermal insulation platform between the fabrication plate and said single-piece element.