Drilling tool

Drilling tool intended to cooperate with a tooling comprising at least one guide orifice extending between a proximal wall and a distal wall of the tooling, intended to be located near a part to be drilled with the drilling tool, comprising:

• a hollow nose part having an outer guide surface, through which a drilling member is intended to pass,
• a gripping clamp including an elastic front blocking part, with a distal end and a proximal end, slidingly mounted on the outer guide surface of the hollow nose part via an inner guide surface, said elastic front blocking part being rigidly connected to a rear movement part, a movement mechanism being connected to the rear movement part in order to move the gripping clamp rearward along the hollow nose part in such a way that the elastic front blocking part is expanded radially in an elastic manner towards the outside,
• wherein the distal end of the elastic front blocking part comprises a bead protruding radially towards the outside, configured to ensure the stopping in translation of the drilling tool with respect to the tooling, by bearing against the distal wall of the tooling surrounding said guide orifice,
• wherein the gripping clamp is configured to go:
• from a retracted position, corresponding to at least one first relative position of the gripping clamp with respect to the hollow nose part, in which the gripping clamp is capable of being inserted and sliding along the guide orifice from a mouth of the guide orifice on the proximal wall, to
• a deployed position, starting from a certain travel of the gripping clamp towards the rear of the hollow nose part from said at least one first position of the gripping clamp with respect to the hollow nose part, in which the elastic front blocking part, including the bead protruding radially towards the outside, is expanded radially, with an arrangement of the bead such that the bead is capable of bearing against the distal wall of the tooling
• surrounding said guide orifice, preventing the sliding of the gripping clamp and of the drilling tool with respect to the guide orifice in the direction opposite to the drilling direction,
• and wherein the outer guide surface of the hollow nose part is configured so as to cause the passage of the gripping clamp from the gripping clamp's retracted position towards the gripping clamp's deployed position, during the movement of the gripping clamp rearward along the hollow nose part on a first section of length of the outer guide surface of the hollow nose part, from the first position of the gripping clamp with respect to the hollow nose part, the outer guide surface of the hollow nose part comprising a second section of length, adjacent to the first section of length, configured to ensure the maintaining of the gripping clamp in the deployed position, without increasing the diameter of the elastic front blocking part by radial expansion, in such a way as to authorise the forward movement of the hollow nose part towards the surface of the part to be drilled to compensate for a relative movement between the guide orifice of the tooling and the surface of the part to be drilled during the drilling, as well as the deformation of the surface of the part to be drilled engendered by the drilling stress, and thus allow the control of the stress exerted by the hollow nose part on the surface of the part to be drilled.