Additive manufacturing process for a part made up in whole or in part of a three-dimensional lattice

L’invention concerne un procédé de fabrication d’une pièce constituée en tout ou partie par au moins un treillis en trois dimensions, ce treillis en trois dimensions étant fabriqué de manière additive par dépôts successifs de différentes couches de poudre de fabrication additive et consolidation sélective desdites couches de poudre le long d’au moins une trajectoire comprenant différents vecteurs de fabrication, le treillis en trois dimensions comprenant au moins deux strates de brins parallèles et espacés les uns des autres, les brins d’une strate s’étendant dans une direction longitudinale différente de la direction longitudinale dans laquelle s’étendent les brins d’une autre strate. Le procédé de fabrication prévoit que chaque brin est consolidé uniquement via une pluralité de vecteurs de fabrication s’étendant dans la direction longitudinale dans laquelle s’étend ledit brin. Figure de l’abrégé : Pas de figure The invention relates to a method for manufacturing a part consisting in whole or in part of at least one three-dimensional lattice, this three-dimensional lattice being manufactured additively by successive depositions of different layers of additive manufacturing powder and selective consolidation of said layers of powder along at least one trajectory comprising different manufacturing vectors, the three-dimensional lattice comprising at least two layers of parallel and spaced apart strands, the strands of one layer extending in one direction longitudinal direction different from the longitudinal direction in which the strands of another stratum extend. The manufacturing process provides that each strand is consolidated only via a plurality of manufacturing vectors extending in the longitudinal direction in which said strand extends. Abstract figure: No figure

INSTALLATION FOR MANUFACTURING AN OPTICAL FIBER PREFORM

L'installation de fabrication d'une préforme de fibre optique comporte un tube de réaction et un tube de sortie de suies de silice excédentaires équipée intérieurement d'une vis à filets hélicoïdaux plats d'évacuation de ces suies excédentaires. Elle est caractérisée en ce que la vis (15) est une hélice évidée en long et en ce qu'elle comporte un cylindre (16), logé dans le canal intérieur (17) de l'hélice, monté désaxé dans ce canal et en appui contre la surface intérieure de l'hélice, et entraîné en rotation sur lui-même. Application: préforme de fibre optique. The installation for manufacturing an optical fiber preform comprises a reaction tube and an outlet tube for excess silica soot equipped internally with a screw with flat helical threads for removing these excess soot. It is characterized in that the screw (15) is a propeller hollowed out lengthwise and in that it comprises a cylinder (16), housed in the internal channel (17) of the propeller, mounted off-axis in this channel and in bearing against the inner surface of the propeller, and driven in rotation on itself. Application: optical fiber preform.

DEVICE FOR MANUFACTURING AN OPTICAL FIBER PREFORM COMPRISING A RING FOR TRAPPING AND DIFFUSING LIGHT RADIATION

Apparatus for manufacturing an optical fiber preform and including a ring for trapping and diffusing light radiation

An apparatus and method for manufacturing an optical fiber preform from a tube of vitreous material. A holding device holds the tube during manufacture of the preform and a heater supplies the necessary heat energy for preform manufacturing. A diffuser is disposed adjacently to an end of the tube of vitreous material to trap and diffuse light radiation generated in the tube by the heater. The invention can be used in an apparatus for drawing an optical fiber from a preform. The diffuser traps and diffuses light radiation generated in the optical fiber preform by a fiber drawing oven.

Additive manufacturing process for a part made up in whole or in part of a three-dimensional lattice

L’invention concerne un procédé de fabrication d’une pièce constituée en tout ou partie par au moins un treillis en trois dimensions, ce treillis en trois dimensions étant fabriqué de manière additive par dépôts successifs de différentes couches de poudre de fabrication additive et consolidation sélective desdites couches de poudre le long d’au moins une trajectoire comprenant différents vecteurs de fabrication, le treillis en trois dimensions comprenant au moins deux strates de brins parallèles et espacés les uns des autres, les brins d’une strate s’étendant dans une direction longitudinale différente de la direction longitudinale dans laquelle s’étendent les brins d’une autre strate. Le procédé de fabrication prévoit que chaque brin est consolidé uniquement via une pluralité de vecteurs de fabrication s’étendant dans la direction longitudinale dans laquelle s’étend ledit brin. Figure de l’abrégé : Pas de figure The invention relates to a method of manufacturing a part constituted in whole or in part by at least one three-dimensional lattice, this three-dimensional lattice being manufactured additively by successive deposits of different layers of additive manufacturing powder and selective consolidation. said layers of powder along at least one path comprising different manufacturing vectors, the three-dimensional lattice comprising at least two strands of parallel strands spaced apart from each other, the strands of one stratum extending in one direction longitudinal different from the longitudinal direction in which the strands of another stratum extend. The manufacturing process provides that each strand is consolidated only via a plurality of manufacturing vectors extending in the longitudinal direction in which said strand extends. Abstract figure: No figure

Method for the additive manufacture of a component fully or partially made up of a three-dimensional lattice

A method for manufacturing a part made up entirely or partially of at least one three-dimensional lattice is disclosed. The three-dimensional lattice is produced by additive manufacturing by successive depositions of different layers of additive manufacturing powder and selective consolidation of the layers of powder along at least one path comprising different manufacturing vectors, the three-dimensional lattice comprising at least two layers of parallel strands that are spaced apart from one another, the strands of one layer extending in a longitudinal direction different from the longitudinal direction in which the strands of another layer extend. The manufacturing method provides that each strand is consolidated only via a plurality of manufacturing vectors extending in the longitudinal direction in which the strand extends.