Generative manufacturing method and apparatus therefor with oppositely directed gas streams protection

The present invention relates to an apparatus and a method for generative manufacture of components by layerwise bonding of powder particles with each other and / or with an already formed semifinished product or substrate by selective interaction of the powder particles with a high energy beam (13), during the connection of the powder particles in a layer of powder particles by means of high-energy beam, a gas flow (7) having a flow direction with an at least partially aligned parallel to the layer of powder particles towards proportion over the layer of the powder particles and / or the connecting portion is provided in the layer of powder particles, wherein the at least partially parallel to the layer of the powder particles oriented direction component of the gas flow (7) is produced in at least two directions during the connection of the powder particles in a layer, the mutually opposite direction of play aufwei sen.