Method for detecting defects in an additive manufacturing powder layer deposited on a working area
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InventorsRAPHAEL VERNET, PASCAL BELAUBRE, SEBASTIEN DEVROE
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Abstract
A method for detecting defects in a layer of additive manufacturing powder deposited on a work zone comprises the steps of: i. acquiring an image of a layer of additive manufacturing powder, ii. determining a discrete spectral representation of the image acquired, iii. filtering the discrete spectral representation of the image acquired in frequency terms, iv. determining a filtered image from the filtered discrete spectral representation of the image acquired, and v. analyzing the filtered image so as to detect defects.
Claims12
1-11. (canceled)
A method for detecting defects in a layer of additive manufacturing powder deposited on a work zone, the method comprising, before selectively consolidating the layer of additive manufacturing powder, implementing the following steps using processing means (21, 31):
- (i) acquiring an image of the layer of additive manufacturing powder deposited;
- (ii) determining a discrete spectral representation of the image acquired;
- (iii) filtering the discrete spectral representation of the image acquired in frequency terms using a filter having at least one cutoff frequency;
- (iv) determining a filtered image from the filtered discrete spectral representation of the image acquired;
- and
- (v) analyzing the filtered image so as to detect defects in the layer of additive manufacturing powder deposited.
A method for selectively additively manufacturing a three-dimensional object from layers of powder, the method comprising implementing the following steps using a device for selectively additively manufacturing a three-dimensional object from layers of powder (1):
- (A) applying a layer of additive manufacturing powder to a base or to a previously consolidated layer;
- (B) detecting defects in the layer of additive manufacturing powder deposited before it is consolidated;
- and
- (C) emitting a laser beam onto a first point of the layer of additive manufacturing powder, so as to consolidate a first zone of the layer of powder comprising the first point,
- wherein steps (A) through (C) are repeated for a determined number of iterations, and
- wherein step (B) comprises implementing the following sub-steps using processing means (21, 31):
- (B.i) acquiring an image of the layer of additive manufacturing powder;
- (B.ii) determining a discrete spectral representation of the image acquired;
- (B.iii) filtering the discrete spectral representation of the image acquired in frequency terms;
- (B.iv) determining a filtered image from the filtered discrete spectral representation of the image acquired;
- and
- (B.v) analyzing the filtered image so as to detect defects in the layer of additive manufacturing powder deposited.
Dependencies are inferred from the claim text.