IMPROVEMENTS IN OR RELATING TO ON-AXIS MELT POOL SENSORS IN AN ADDITIVE MANUFACTURING APPARATUS

This invention concerns a method of aligning an on-axis melt pool sensor (123) in an additive manufacturing apparatus. The method comprises scanning a first laser beam (118a, 118b, 118c, 118d) along a first scan path (L1) across a working surface (110) using afirst optical train (106a, 106b, 106c,10...

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Bibliographische Detailangaben
Hauptverfasser:	MANSELL, Jonathan, DARDIS, John, BROWN, Ceri
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	ADDITIVE MANUFACTURING TECHNOLOGY ADDITIVE MANUFACTURING, i.e. MANUFACTURING OFTHREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVEAGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING,STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CASTING CLADDING OR PLATING BY SOLDERING OR WELDING CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING MACHINE TOOLS MAKING METALLIC POWDER MANUFACTURE OF ARTICLES FROM METALLIC POWDER METAL-WORKING NOT OTHERWISE PROVIDED FOR PERFORMING OPERATIONS POWDER METALLURGY SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS SOLDERING OR UNSOLDERING TRANSPORTING WELDING WORKING BY LASER BEAM WORKING METALLIC POWDER WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	This invention concerns a method of aligning an on-axis melt pool sensor (123) in an additive manufacturing apparatus. The method comprises scanning a first laser beam (118a, 118b, 118c, 118d) along a first scan path (L1) across a working surface (110) using afirst optical train (106a, 106b, 106c,106d) to generate a melt pool (130) along the first scan path (L1) and scanning a field of view (132) of an on-axis sensor (123) along a second scan path (L2) across the working surface using a second optical train (106a, 106b, 106c,106d) for steering a second laser beam (118a, 118b, 118c, 118d). The first and second scan paths (L1, L2) intersect. An adjustment to be made to an alignment of the field of view (132) of the on-axis sensor (123) with an optical axis of the second optical train (106a, 106b, 106c,106d) is determined from a variation in the signal generated by the on-axis sensor (123) as the field of view (132) is scanned along the second scan path (L2). La présente invention concerne un procédé d'alignement d'un capteur de bain de fusion sur l'axe (123) dans un appareil de fabrication additive. Le procédé comprend le balayage d'un premier faisceau laser (118a, 118b, 118c, 118d) le long d'un premier trajet de balayage (L1) à travers une surface de travail (110) à l'aide d'un premier train optique (106a, 106b, 106c, 106d) pour générer un bain de fusion (130) le long du premier trajet de balayage (L1) et le balayage d'un champ de vision (132) d'un capteur sur l'axe (123) le long d'un second trajet de balayage (L2) à travers la surface de travail à l'aide d'un second train optique (106a, 106b, 106c, 106d) pour diriger un second faisceau laser (118a, 118b, 118c, 118d). Les premier et second trajets de balayage (L1, L2) se croisent. Un réglage devant être effectué sur un alignement du champ de vision (132) du capteur sur l'axe (123) avec un axe optique du second train optique (106a, 106b, 106c, 106d) est déterminé à partir d'une variation du signal généré par le capteur sur l'axe (123) lorsque le champ de vision (132) est balayé le long du second trajet de balayage (L2).