
476 Fundamentals of Machining Processes
boiling point, melting point, thermal conductivity, and specic heat
play a decisive role on the machinability of materials by EBM.
3. Laser Beam Machining (LBM): In LBM, the workpiece material is
removed through several effects including reection, absorption,
and conduction of light that is followed by melting and evapora-
tion. The behavior of the work material with respect to these effects
determines the material machinability. Reectivity depends on the
wavelength, the properties of materials, surface nish, the amount
to which it is oxidized, and its temperature. At a given wavelength,
the higher t ...