Defect detection and correction

Boundary detection for an object manufactured by 3D printing comprises receiving 21 an, IR or near-infrared, first image of a first layer of the object. A computer aided design (CAD) model representing the object is sliced 23 into slices, a slice corresponding to the first layer is selected 24 and o...

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Bibliographische Detailangaben
1. Verfasser:	Yuxing Cui
Format:	Patent
Sprache:	eng
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 CALCULATING COMPUTING COUNTING IMAGE DATA PROCESSING OR GENERATION, IN GENERAL PERFORMING OPERATIONS PHYSICS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	Boundary detection for an object manufactured by 3D printing comprises receiving 21 an, IR or near-infrared, first image of a first layer of the object. A computer aided design (CAD) model representing the object is sliced 23 into slices, a slice corresponding to the first layer is selected 24 and output 25 as a second image having a border representing an edge of the object. The second image is correlated 26 with the first image and pixels in the first image corresponding to the border in the second image are identified 27 as representing the periphery. Pixels representing the boundary and outside the boundary may be removed 28 from the first image. A defect detection method in which the brightness of a pixel is compared to the average brightness of an image region may be applied to the first image. The AM method may be a powder bed manufacturing method such as electron beam melting or laser metal deposition. Also disclosed is a method of correcting a defect.