Method and apparatus for producing three-dimensional objects by selectively solidifying a build material applied layer by layer

Abstract

An apparatus for producing a three-dimensional object includes a process chamber, a process assistance device including a centre module and an outer module for facilitating a primary gas flow, and a feed device disposed above a build platform for feeding a secondary gas flow through a feed opening of the feed device onto the build platform. The feed device includes two feed channels disposed on either side of a beam inlet opening. The process chamber includes two wall portions opposing each other in an X direction. Each wall portion has a flow surface that extends toward the build platform. The flow surfaces of the two wall portions constrict a cross-sectional area of the process chamber in the X direction. Proceeding from the feed opening of the feed device, a distance between the flow surfaces of the two wall portions in the X direction progressively reduces towards the build platform.