Patent ID: 9144941
Filing Date: 2015-09-29
Classification: B22F,B29B,B29C,B33Y,Y02P,Y10T

Abstract:
1. A process for production of three dimensional objects in a construction chamber, comprising: inertizing the construction chamber by admission of an inertizing gas or inertizing gas mixture which is unreactive with process components under process conditions; wherein a density of the inertizing gas or inertizing gas mixture is higher than the density of air, and the production process comprises a layer-by-layer method, comprising: supplying a first layer of a pulverulent material to the construction platform of a construction chamber; inertizing the construction chamber with the inertizing gas or inertizing gas mixture; selectively melting the pulverulant material according to a pattern for the three-dimensional object; allowing the molten pulverulant material to solidify in the pattern of the three-dimensional object; adding a further layer of a pulverulent material to the first layer containing the solidified material of the pattern; inertizing the construction chamber with the inertizing gas or inertizing gas mixture; selectively melting the further added layer of a pulverulant material in the pattern of the three dimensional object; allowing the molten pulverulant material to solidify onto the solidified material; and continuing the addition of the pulverulant material, inertizing the construction chamber, selective melting and solidification according to the pattern of the three dimensional object until a three dimensional object of the pattern is obtained; the production process further comprising: inertizing the pulverulent material in a feed container prior to supply to the construction chamber.