Influence of the ploughing effect on the vibratory drilling behaviour
by Nicolas Guibert, Henri Paris
International Journal of Machining and Machinability of Materials (IJMMM), Vol. 3, No. 1/2, 2008

Abstract: The poor removal of chips in deep drilling of small diameter is often the cause of tool breakage and poor quality surface. The vibratory drilling enables the chip to be split thanks to the axial vibrations of the drill, self-maintained by the cutting energy. Thus, chips are then evacuated easily. The authors developed a specific tool holder with an adapted axial stiffness. The cutting conditions are chosen to be inside the instable domain and with the chatter phenomenon the lip jump out of the material. The parameters of the Self-Vibrating Drilling Head (SVDH) and the cutting conditions are conditioned by the presence of ploughing effect that dumps the vibrations. The objectives of this paper are (i) to model the cutting and ploughing forces, the dynamical behaviour of the SVDH and the material removal and (ii) to foresee the influence of ploughing on the shape of the chip. A numerical simulator makes it possible to validate the cutting conditions, in particular the influence of the ploughing effect. The simulated results are validated by an experimental protocol.

Online publication date: Sun, 23-Mar-2008

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