Abstract: The invention relates to a device for correcting an inhomogeneous intensity distribution of a radiation field generated by a radiation source, in particular a radiation source for a device for producing three-dimensional articles by the layer-by-layer solidifying, in a build plane, of a material that is solidifiable under the action of radiation. The device comprises a correcting or filtering device that is to be introduced, between the radiation source and the build plane, into a radiation path of a device for producing three-dimensional articles by the layer-by-layer solidifying of a material that is solidifiable under the action of radiation. Further, improved methods for producing a device for correcting an inhomogeneous intensity distribution of a radiation field generated by a radiation source, and methods and devices for producing a three-dimensional article are proposed.

Abstract: A method for producing a three-dimensional object by layer by layer solidifying of a material which is solidifiable under the action of radiation is provided. The method makes use of exposure masks. In order to form each object layer to be solidified of the object in a construction plane, there is generated at least one, preferably a single, digital exposure mask by means of which the radiation is selectively projected into the construction plane. For each exposure mask, according to the object layer to be solidified, a single 2-bit bitmap is calculated which assigns either the bit-value “transparent” or the bit-value “non-transparent” to each pixel of the exposure mask. In addition, an improved exposure mask generating apparatus and an improved device for producing a three-dimensional object are proposed.

Abstract: A discharging device for a continuous caster has two three-phase motors as its drive member. For the discharging process, these three-phase motors selectively charge the drive mechanism of the drive shaft for the drive rollers in opposite directions. The three-phase motors are selectively connected with the drive mechanism via separate electromagnetic couplings and thus produce the forward and reverse movement of the casting profile. Simple additional devices permit fully automatic operation.

Abstract: In a continuous caster including a crucible for metal to be melted and a mold coupled to the crucible, the crucible and the mold can be screwed together so that easy removal and replacement of the mold is possible. The crucible and the upper part of the mold are surrounded by an induction heating coil to maintain the metal in a molten condition. A gasket of zirconium oxide is clamped between the mold and the crucible.