Method for operating at least one apparatus for additively manufacturing of three-dimensional objects by means of successive layerwise selective irradiation and consolidation of layers of a build material which can be consolidated by means of an energy beam, wherein at least one object is being built by successively irradiating layers of the object in a build plane, wherein at least one part of at least one layer of the object is assigned to be irradiated by a first energy beam and at least one other part of at least one layer of the object is assigned to be irradiated by another energy beam, wherein the parts of layers are assigned to be irradiated by one of the at least two energy beams based on a Huffman coding.

Three-dimensional (3D) printing may be described as an additive manufacturing process for generating 3D components. A 3D model may be used by a 3D printer to print the 3D component. In 3D printing, successive layers of material may be utilized to generate the 3D component. As part of the 3D printing process, the 3D component may be subjected to sintering. In some cases, the sintering may be accomplished by subjecting the 3D component to a heat source, or other types of processes.

A method is disclosed and includes providing a first data set marking an object cross-section, determining whether the length of a connecting line undercuts a specified minimum dimension, generating a second data such that, in the event falling the minimum dimension is undercut, a position lying within an object cross-section on the connecting line is marked as a position not to be solidified or to which a reduced radiation to be supplied, and for a position lying outside of the object cross-section, positions of an object cross-section directly above or below that are adjacent to this position are marked as positions not to be solidified or to which a reduced radiation is to be supplied, and integrating the second data set into the control command set.

The invention relates to formwork for producing concrete tubbing (500) for a tunnel lining system, with a concrete tub to receive a volume of concrete required to produce the tubbing and, if necessary, to receive the intended reinforcement for the concrete tubbing (500), wherein the concrete tub has at least one base and walls (14, 15) on the base adapted to the mould, wherein at least one wall is arranged detachably from the base and can be pivoted relative to the base between a closed position and an opened position. According to the invention, the formwork has at least one drive system for pivoting the at least one wall between the open and the closed position and for holding same in the relevant position, and the drive system has at least one actuator for pivoting the at least one wall between the open and the closed position.

Provided is a mold cooling system for the manufacturing of ceramic parts by freeze-casting including: a source (1) of cooling gas; a cooling gas cooling medium (7) fluidically connected to the cooling gas source (1); and a cooling cell (5), fluidly connected to the cooling gas cooling medium (7), including a mold (9) in its interior, wherein the cooling cell (5) includes a refrigerated cooling gas injection opening. Thus, a mold cooling system is provided for the manufacturing of ceramic parts by freeze-casting including the stages of: refrigerating a cooling gas coming from a cooling gas source (1); and injecting a cooling gas that is refrigerated in a cooling cell (5) including a mold (9) in its interior.

An apparatus for forming compacted powder products. The apparatus includes a powder supply system and a compacting station. An emitter emits an input X-ray beam having a predetermined emission intensity. An output detector detects an output parameter representing an output intensity of the X-ray beam which passes through the powders. A reference detector detects a reference parameter representing the effective intensity of the X-ray beam generated. A control unit is programmed to compensate the output parameter by means of the reference parameter and to generate a control signal representing the density detected and to control the powder supply system by means of the control signal.

In an example, a method includes receiving, at a processor, a data model of an object to be generated in additive manufacturing. A virtual build volume comprising a representation of at least a portion of the object may be segmented into a plurality of nested segments comprising a core segment and a peripheral segment. Segmenting the virtual build volume may comprise determining a dimension of the peripheral segment based on at least one of a geometry of the object and an intended object property.

A process monitoring system for an additive manufacturing apparatus includes a scanner, a sensor device, and an optical focus-tracking device. The scanner includes an optical adjustment device that directs a melting beam emitted by a laser melting device onto a construction plane to generate a melting section of the construction plane. The sensor device may detect reflected radiation from the melting section and generate sensor data indicative of a size, shape, and/or temperature corresponding to the melting section. The optical focus-tracking device includes a focusing lens located between the scanner and the sensor device. The focusing lens may be actuatable by electronic machine data derived from the sensor data to impart a first focus adjustment with respect to the reflected radiation detected by the sensor followed by a second focus adjustment with respect to the melting beam directed by the optical adjustment device.

A method is disclosed in which print instructions for a 3D print job are received which including a plurality of layers to be printed on a layer-by-layer basis to form a 3D object. The print instructions are executed using at least one nozzle whilst performing a nozzle test in a plurality of layers of the 3D print job. The nozzle test results for each layer of the plurality of layers is compared to stored nozzle data. A current nozzle health status is determined based upon the comparison. A corrective action is triggered if the health status is non-compliant with a pre-determined threshold. An apparatus and a machine-readable storage medium comprising instructions executable by a processor are also disclosed.

A system is provided for constructing a building structure, and specifically a wall of the structure, using a toolpath generation system and method to compensate for an uneven or unlevel foundation surface on which the wall is additively formed. The system includes a printing assembly and a mechanism for measuring a three dimensional topology of the surface. A processor is provided to receive a measured topology and to generate one or more sublayers and corresponding sub toolpaths. A nozzle mounted on the printing assembly can then extrude a sublayer bead in select recess or valley portions of the surface and below a subsequently extruded bead placed on high portions of the foundation surface. The sublayer beads compensate for the uneven foundation surface to produce a more even or level ensuing foundation surface using the additive printing process itself.