Drilling head with axial vibrations

A drilling head including a generator of axial oscillations, comprising a mount for coupling said drilling head to a motor that drives the rotation of the mount about an axis, the mount having a longitudinal axis that coincides with the axis of rotation of the motor, a tool holder, elastically deformable suspension means for suspending the tool holder from the mount, allowing axial movements, and guide means to guide the tool holder in the mount along the longitudinal axis of said mount, comprising a controlled generator of reciprocating movements in the direction of the abovementioned axis, interposed between the mount and the tool holder, wherein the generator of reciprocating axial movements is tubular and of the piezoelectric type without preload, pressing against the tool holder mount via one of its ends, and in that it comprises a sliding pivot between the mount and the tool holder inside the generator, an axially elastic external sleeve of high torsional stiffness fixed by its ends to the mount and to the tool holder respectively, and an annular shim of determined axial stiffness and low flexural stiffness via which the tool holder presses axially against the end of the generator of reciprocating movements, reducing bending stresses transmitted to said generator of reciprocating movements while allowing the axial movements to be transmitted.