Abstract: Various embodiments of the teachings herein include methods for producing an object layer-by-layer using a powder-based 3D printing method by selective fusing of layers of a powder in a powder bed with a selective laser melting process or selective electron beam melting process. At least two successive layers are part of a group. An example method includes, for each group: providing a first layer of the powder; fusing a part of the first layer with first exposure vectors parallel to one another and at a defined spacing; providing a second layer of powder; and fusing a part of the second layer with second exposure vectors arranged at an offset parallel to the first exposure vectors. The exposure vectors of successive groups are rotated by an angle relative to one another.

Abstract: Various embodiments include a method for additive manufacturing of a building structure on using a simulation comprising: accessing a data set for the building structure describing the building structure in layers; calculating a global heat development in previous layers based a building history and heat input by an energy beam; determining a local heat development in a vicinity of the heat input; determining the process control based on the global and the local heat development; loading correction measures from a database; and assigning the correction measures locally to individual vectors of a tool path of the energy beam. At least one mass integral is calculated for individual vectors of the tool path. The measures are determined on the basis of a comparison of the calculated mass integral with mass integrals stored in the database.

Abstract: A computing system may include an access engine and a toolpath reordering engine. The access engine may be configured to access an original layer toolpath for slice of a 3D CAD object as well as a heat criticality measure for the original layer toolpath. The heat criticality measure may specify a heat impact for different points on the multiple toolpath segments of the original layer toolpath for the 3D printing of the physical part using the original layer toolpath. The toolpath reordering engine may be configured to reorder the multiple toolpath segments into a modified layer toolpath, and the modified layer toolpath may have a heat criticality measure with a lesser heat impact on the physical part than the heat criticality measure for the original layer toolpath.

Abstract: Various embodiments include a method for additive manufacturing of a building structure on using a simulation comprising: accessing a data set for the building structure describing the building structure in layers; calculating a global heat development in previous layers based a building history and heat input by an energy beam; determining a local heat development in a vicinity of the heat input; determining the process control based on the global and the local heat development; loading correction measures from a database; and assigning the correction measures locally to individual vectors of a tool path of the energy beam. At least one mass integral is calculated for individual vectors of the tool path. The measures are determined on the basis of a comparison of the calculated mass integral with mass integrals stored in the database.

Abstract: The invention relates to a method for determining production-related shape deviations (?l,i) and stresses in a construction (11) produced by means of an additive production method, which construction is produced by solidifying construction material in successive layers (12). The invention further relates to a use of said method to produce corrected production data (19) and to the application of said production data in an additive production system. The invention further relates to a computer-readable data carrier and to a computer program for performing said method and to a simulation in which such a computer program can run. In the method, superlayers (13) are used in order to reduce the computational complexity of the simulation.

Abstract: Various embodiments include methods for the powder-bed-based additive manufacturing of a workpiece comprising: manufacturing the workpiece layer by layer in a powder bed, including solidifying a respective uppermost layer of the powder bed using an energy beam. During the solidification of the respective uppermost layer of the powder bed, analyzing a geometry of previously solidified layers below the respective uppermost layer. The method may include reducing an average power over time introduced by the energy beam per unit of area of the powder bed with application of correction parameters if the heat dissipation into the previously solidified layers is reduced in dependence on the workpiece depth available below the energy beam.