Method and device for creating a gas stream during the additive manufacturing of a product in a powder bed

Abstract

Device and method for the layered manufacture of a three-dimensional product () with a recess (), in which successive powder layers are applied to a building surface () above a building platform (), wherein this building platform () extends in a space between a tube wall () of a building tube () and an insert provided therein (), wherein a beam of rays () is made to impinge on each powder layer and this beam () is moved across the powder layer to form successive layers of said product () above the building platform (), so that the insert () extends in said recess (). According to the invention, a gas stream () is generated above the building surface (), extending above said space, wherein it is made sure that this gas stream () crosses said beam of rays () wherein flue gases formed while the beam of rays () strikes said powder layer, are discharged through this gas stream ().