FIELD: process engineering.
SUBSTANCE: proposed method comprises determining time dependence of magnitudes of at least one axial force on drill penetration in metal material and moment originating in at least one part of drilling job to be sued in plotting graph, selecting values therefrom that correspond to horizontal section of plotted curve and maximum values testifying to availability of defects, and determining relation of maximum values to those of curve horizontal section used to define defect type and criterion of its severity.
EFFECT: higher quality of processing.
20 cl, 43 dwg
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