Patent ID: 7523678

Claim:
A method for detecting and optionally quantifying drilling anomalies in a metal part, a drilling operation having been performed on said metal part by a drill bit, wherein said method comprises determining on the one hand a value set of at least one of the two following parameters, depending on the penetration axial stress of the drill bit into the metal part Fz(t) and the torque C(t), generated during at least one part of the drilling operation, followed by isolating the Fz threshold and C threshold values corresponding to a threshold and representative of the absence of any anomaly, the Fz max and C max values corresponding to the maximum values and being representative of the presence of an anomaly, and then determining at least the Fz max /Fz threshold and C max /C threshold ratios or the Area Fzmax /Area Fzthreshold or Area Cmax /Area Cthreshold area ratios that are the areas under the Fz(t) or C(t) curves having as a lower boundary Fz threshold or C threshold and as a higher boundary Fz max or C max related to the areas under the Fz(t) or C(t) curves having as a higher boundary Fz threshold or C threshold , so as indicate the anomaly type and optionally its severity.