By George Chryssolouris
Laser Machining: concept and Practice addresses state of the art laser machining in a manner precious for study- ers, academicians and practitioners, fairly production engineers, who're contemplating lasers as an answer to the machining standards in their factories and crops. This e-book offers distinct details at the conception in the back of laser machining, in addition to its specifications, makes use of and functions. that allows you to position laser machining in its right context, the writer starts with an outline of traditional fabric elimination techniques and pass directly to describe intimately the actual mechanisms curious about lasers, the differing kinds of lasers occupied with laser machining, and laser machining platforms, which come with optics, positioning structures, manipulators, and so forth. The theoretical remedy of the laser incorporates a part at the fundamentals of warmth move and fluid mechanics, and analyses of 1, and three-d laser machining approaches. The publication closes with an outline of cutting-edge laser machining purposes in study and commercial practice.
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Additional info for Laser Machining: Theory and Practice
The physics of the material removal process for excimer lasers is different than that for C02 or Nd:YAG lasers. Instead of removing material through melting or vaporization, where the material is heated from solid to liquid and/or gaseous states, the excimer laser removes material through ablation, breaking the chemical bonds of the material until it dissociates into its chemical components. In ablation, no liquid or gaseous phases of the material are present. The ablation process occurs as the UV pulses of radiation from the excimer laser make contact with the workpiece surface.
14 Configuration for Laser Machining With an Excimer Laser l/u + l/v = l/f u = distance from mask to lens v = distance from lens to workpiece f = focal length of lens For values of u greater than 2 x f, the image on the workpiece will be inverted and demagnified, with a de magnification factor d = Iulv!. The energy density of the laser beam on the workpiece is proportional to the square of the demagnification: (2-2) where EDw is the energy density at the workpiece and EDO is the energy density of the unfocussed beam.
5. A, Introduction to Manufacturing Processes, McGraw Hill, New York, 1974. 6. , Werkzeugmaschinen, VDI-Verlag, DUsseldorf, W. Germany, 1979. 7. , Cincinnati Ohio, 1980. 8. Tool and Manufacturing Engineers Handbook, 5MB, Dearborn, Michigan, 1983. 2 Lasers for Machining The laser is clearly the most critical component of any laser machining system. This chapter provides an overview of the operation of the various types of lasers used in machining. First, the basic mechanisms required to produce laser light, such as stimulation, amplification, and population inversion are explained.