mathematical analysis of laser percussion drilling process and the influence on process parameters

Apr 15th, 2015
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MATHEMATICAL ANALYSIS OF LASERPERCUSSION DRILLING PROCESS AND THEINFLUENCE OF PROCESS PARAMETERSM. M. Ruthandi, B. W. Ikua, G. N. Nyakoe and J. N. KeraitaAbstractDrilling applications represent about 5% of the industrial laser materials processing applications. The improvement ofproductivity has led to several drilling strategies with respect tolaser sources, the beam handling, beam distribution, and handlingof the workpiece, all of which contribute to the overall efficiencyof the process and a high productivity. Laser drilling is based onthe absorption of the laser energy by the workpiece material andthe conversion of the photon energy into thermal energy. Whenthe temperature exceeds that of the melting and/or vaporization, theworkpiece material changes phase and the hole geometry is formed.emitted by an atomic or molecular system, it always involvesa quantum of energy [1], [2], [3].FluorescenceAn atom in an upper energy level spontaneously decays to alower energy level, emitting the energy difference as a photonwith the appropriate frequency to satisfy equation 1.AbsorptionLaser percussion drilling is accomplished by focusing a laser beamto a spot equal in diameter to the hole to be drilled. The qualities ofa hole produced by laser drilling are judged on a number of differentcharacteristics. The geometric factors are hole roundness, hole taperand variation in hole entrance diameter. The metallurgical factors areoxidation and recast layer.This

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