Abstract: An electron beam installation, which is used for processing powdered material, has a powder container, which can accommodate a powder bed made of the powdered material to be processed. Furthermore, it has an electron beam generator, which is configured to direct an electron beam onto laterally differing locations of the powder bed. To reduce the dispersion of the powdered material during the processing using the electron beam, the electron beam installation has a frit device, which, by applying an AC voltage between at least two electrodes, generates an electromagnetic alternating field, which bonds the powdered material of the powder bed, at least in regions over the powder bed.

Abstract: A method of processing a powdery material for additively manufacturing a workpiece (22) comprises the steps of: (a) providing a device (15) for receiving a powder bed (20) of the powdery material to be machined and a beam generator (12) adapted to direct an energy beam (13) to laterally different locations of the powder bed (20); b) applying the powdery material in layers to the powder bed (20); c) irradiating an area (30; 30a; 30b; 30c) in the powder bed (20) with the energy beam (13), wherein the area (30; 30a; 30b; 30c) is composed of a plurality n of points P1 . . . Pn arranged in two dimensions, which are irradiated one after the other. In order to improve the scanning strategy during step c), it is provided that at least once during the irradiation of the area two successively irradiated points Pi, Pi+1 are spaced apart from each other in such a way that in each of the two dimensions at least one other point P1 . . . Pi?1, Pi+2 . . .

Abstract: A method of additively manufacturing a workpiece (22) from a powder material, comprises the steps of: (a) providing a device (15, 17) for receiving a powder bed (20) of the powdery material, in particular in a vacuum process chamber (11), and a beam generator (12) adapted to direct an energy beam (13) to laterally different locations of the powder bed (20); b) layer-by-layer application of the powdery material to the powder bed (20); c) creating the workpiece (22) in the powder bed (20) layer by layer by selectively bonding the powdery material to the energy beam (13); d) during the production of the workpiece (22), in addition to the workpiece (22), a cooling structure (30) is produced in the powder bed (20) by selective bonding of the powdery material to the energy beam (13), the cooling structure (30) being adapted to dissipate heat.

Abstract: An electron beam system for the additive manufacture of a workpiece having a process chamber which can be evacuated and comprising an electron beam generator which is designed to direct an electron beam onto laterally different locations of a powder bed made of a pulverulent material to be processed in the process chamber. In order to improve the throughput of the electron beam system, the system has at least one prechamber which can be evacuated and which is constantly connected to the process chamber during the operation of the electron beam system in a vacuum-tight manner via a sluice door. Furthermore, at least one movable receiving device for receiving the powder bed and a transport device are provided, said transport device allowing the at least one receiving device to be transported from the prechamber into the process chamber.

Abstract: Methods for processing a powdered material using electron beam equipment for the additive manufacture of components, which methods solve the problem of electrostatic powder entrainment and significantly reduce the process times. This effect is achieved by acceleration voltages of 90 kV or greater in the pre-heating step and/or in the melting step.

Abstract: An electron beam installation, which is used for processing powdered material, has a powder container, which can accommodate a powder bed made of the powdered material to be processed. Furthermore, it has an electron beam generator, which is configured to direct an electron beam onto laterally differing locations of the powder bed. To reduce the dispersion of the powdered material during the processing using the electron beam, the electron beam installation has a frit device, which, by applying an AC voltage between at least two electrodes, generates an electromagnetic alternating field, which bonds the powdered material of the powder bed, at least in regions over the powder bed.

Abstract: To measure the intensity profile of an electron beam the electron beam is conducted on to a measuring structure having areas with different back-scattering properties, and back-scattered electrons which are produced by scanning of the measuring structure by the electron beam by means of a deflector unit are measured by a sensor ring. The measuring structure can preferably be installed into and removed from an electron-beam welder and consists of a graphite slab from which a tungsten needle projects perpendicularly.

Abstract: To measure the intensity profile of an electron beam the electron beam is conducted on to a measuring structure having areas with different back-scattering properties, and back-scattered electrons which are produced by scanning of the measuring structure by the electron beam by means of a deflector unit are measured by a sensor ring. The measuring structure can preferably be installed into and removed from an electron-beam welder and consists of a graphite slab from which a tungsten needle projects perpendicularly.