Abstract: A method of additively manufacturing a minimal surface structure of a three-dimensional article includes a computer executing the steps of recording, in the computer, an envelope of the three-dimensional article; generating a density field across a volume enclosed by the envelope with densities of the density field corresponding to local requirement values of at least one physical parameter at respective positions of the three-dimensional article; generating an adaptive Voronoi tessellation of the volume using the density field; generating a first skeleton graph associated with the adaptive Voronoi tessellation; generating a second skeleton graph associated with the first skeleton graph; and generating a digital minimal surface model from the first and second skeleton graphs. The method may further include a 3D printer additively manufacturing the minimal surface structure according to the digital minimal surface model.

Abstract: A cutting-ring assembly configured for use in a tunnel boring machine includes a cutting ring, an axle, and a bearing unit. The cutting ring is rotatably supported on the axle via the bearing unit, and the bearing unit includes at least one rotating outer ring having a first raceway and a second raceway, at least one fixed inner ring having a first raceway and a second raceway, and rolling elements between the raceways. Either the at least one inner ring or the at least one outer ring includes a first ring having an elongated axially extending shoulder and a second ring having an elongated axially extending shoulder abutting against the elongated axially extending shoulder of the first ring.

Abstract: The present disclosure relates to a method for the lightweighting and/or designing of an additively manufactured article. The disclosure further relates to a computer program product adapted for executing the method of the present disclosure as well as an additively manufactured article obtainable by the method according to the present disclosure. The method includes the step(s) of infilling and/or building each of the one or more integral article parts with a quasi-crystalline structure. The additively manufactured article obtainable by performing the method includes a quasi-crystalline structure and/or a quasiperiodic minimal surface infill and/or quasiperiodic minimal surface design structure and/or aperiodic minimal surface design structure and/or aperiodic minimal surface infill. The disclosure further relates to a method of use of a skeleton graph for a preprocessing in an additive manufacturing process.